SEL-351 Distribution and Transmission Relay Standard Features

Transcription

SEL-351 Distribution and
Transmission Relay
Standard Features
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Voltage or load-encroachment control of the four phase time-overcurrent elements for load security.
Six levels of phase, negative-sequence, neutral, and residual overcurrent elements for
coordinated protection; phase and ground directional elements for sensitive, yet secure, fault detection;
phase directional element includes memory for directional stability.
Patented Best Choice Ground Directional® logic selects the optimum element for system conditions.
Communication tripping scheme logic for rapid fault clearing.
Programmable four-shot recloser with synchronism check matches your reclosing practice.
Phase and sequence under- and overvoltage elements increase control scheme flexibility.
Six steps of accurate frequency elements for multilevel under- and overfrequency trip and control.
Event Reports and Sequential Events Recorder simplify fault and system disturbance analysis.
Breaker monitor, which uses breaker manufacturer’s published data for maintenance scheduling.
Substation battery voltage level feature monitors and reports dc voltage levels.
Flexible control logic replaces traditional panel switches, latching relays, and indicating lights.
Develop traditional and custom schemes using advanced SELOGIC® control equations.
Six independent settings groups cover multiple protection and control contingencies.
EIA-232 and EIA-485 serial ports for local/remote access and system integration.
Many RTU-like features reduce project cost by eliminating additional components.
Accurate fault locating for quick circuit restoration and increased service reliability.
Complete, high-accuracy metering eliminates dependence on external meters.
Schweitzer Engineering Laboratories, Inc.
SEL-351 Data Sheet
2
Optional Features
Do not order from this list. Not all features or options are available in every configuration. Contact your SEL
Representative for ordering assistance and pricing.
➤ Distributed Network Protocol (DNP3) with point mapping.
➤ MIRRORED BITS® relay-to-relay communications.
➤ Integration Package, providing system-wide Sequential Events Recorder (SER) capabilities, expanded
front-panel control and display functionality, and expanded control logic.
➤ Programmable Load Profile recorder stores up to 40 days of data for a load profile of 15 values logged
every 15 minutes.
➤ Four independent Power Elements with three single-phase outputs each. Applications include directional power, capacitor switching, breaker failure supervision, and underpower protection.
➤ Sag/Swell/Interruption Report for voltage problem monitoring.
Physical and Connection Options
Do not order from this list. Not all features or options are available in every configuration. Contact your SEL
Representative for ordering assistance and pricing.
➤ Choice of 5 A or 1 A Phase Current inputs.
➤ Choice of 5 A, 1 A, or 0.05 A Neutral Current inputs.
➤ Delta-connected (instead of wye-connected) voltage inputs (not available with some optional feature
groups).
➤ 125/250 Vdc or Vac, 48/125 Vdc or Vac, or 24/48 Vdc power supply.
➤ 24, 48, 110, 125, or 250 Vdc optoisolated control input voltage.
➤ Vertical or horizontal rack mount enclosure (some models).
®
➤ Connectorized or conventional terminal block rear-panel connections.
➤ High-current interrupting contacts increase reliability by eliminating auxiliary relays.
➤ Additional input/output board with 8 inputs and 12 outputs.
SEL-351 Data Sheet
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Functional Overview
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SELOGIC® Control Equations
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Event Reports
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Sequential Events Recorder (SER)
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Breaker Wear Monitor
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Station Battery Monitor
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DNP3 Protocol*
MIRRORED BITS® Communications
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Comm.-Assisted Tripping
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High-Accuracy Metering
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Remote and Local
Control Switches
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Local Display
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Load Profile*
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Fault Locator
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Sensitive Earth Fault Protection*
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Sensitive Directional Earth Fault
(Petersen Coil) Protection*
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Voltage Sag/Swell
Interruption Records*
*Optional Functions
Figure 1
Functional Diagram
Features/Benefits
The SEL-351 Relay design provides secure, reliable,
complete protection. In addition to extensive, versatile,
and easy-to-apply new and traditional protection
functions, this relay also provides comprehensive
control, metering, and monitoring functions. The
SEL-351 is the only instrumentation you need for radial
and looped transmission or distribution protection,
monitoring, metering, and control.
Take full advantage of relay capabilities without being
encumbered by features not immediately used for an
application: set only what you enable. Protective element
thresholds, tripping, reclose, and control scheme settings
are logically structured for flexibility and clarity.
AC Analog Inputs
The SEL-351 has eight analog inputs:
➤ VA, B, C
➤ VS
VA, B, C phase voltage inputs are used in metering,
directional element logic, under- and overvoltage logic,
etc. They can be ordered delta-connected. The VS input
is used in the synchronism-check (25) logic or as a
separate voltage measuring input.
➤ IA, B, C
➤ IN
IA, IB, IC phase current inputs are used in metering,
directional element logic, overcurrent protection, etc. IN
is an independent current input for measuring the output
of a separate current transformer or the summation of IA,
IB, IC current transformers in a residual connection.
When used to measure the current from a transformer
bank neutral (or tertiary winding), IN serves as the
polarizing reference for the current-polarized ground
directional element (32I). The IN current input has
corresponding overcurrent elements that provide
transformer bank backup protection.
SEL-351 Data Sheet
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For sensitive earth fault (SEF) applications, order the
SEL-351 with current input IN rated at 0.05 A nominal.
Complete Overcurrent Protection
The SEL-351 includes phase, negative-sequence,
residual, and neutral overcurrent elements. Each element
type has six levels of instantaneous protection (four of
these levels with definite-time functions). Each element
type has a time-overcurrent element (phase elements
include a maximum-phase time-overcurrent element and
single-phase time-overcurrent elements). Unique
supervision logic for these elements provides the relay
the ability to detect remote faults as easily as it detects
close-in, bolted faults. Each of these overcurrent
elements has directional control.
Overcurrent Elements
for Phase Fault Detection
Maximum-phase, single-phase, and negative-sequence
overcurrent elements detect phase faults. Negativesequence current elements reject three-phase load to
provide more sensitive coverage of phase-to-phase faults.
The maximum-phase overcurrent elements are necessary
for three-phase faults, where significant negative-
sequence quantities are not produced. Applications that
coordinate with downstream, single-pole trip reclosers
should use the single-phase overcurrent protective
elements to achieve precise coordination for evolving
faults on the load side of the recloser.
On heavily loaded feeders, the load-encroachment logic
and/or undervoltage torque control of phase overcurrent
elements adds security. This logic allows you to securely
set the phase overcurrent elements below load to see endof-line phase faults in heavily loaded feeder applications.
This load-encroachment logic uses positive-sequence
load-in and load-out region elements to discriminate
between load and fault conditions (Figure 2). When the
load impedance (Z1) resides in a load region, the phase
overcurrent elements are blocked. As Figure 2 shows,
when a phase fault occurs, Z1 moves from a load region
to the line angle, and the phase overcurrent elements are
unblocked.
The load-encroachment logic controls the phase
directional element. Torque-controlling the phase
overcurrent elements with the phase directional element
automatically includes load-encroachment torque
control. External input torque control of the phase
overcurrent elements is also available.
Line
52
SEL-351
3-Phase Fault
X1
Fault
ZLIN
(Load In
Region)
Line Angle
* Load
ZLOUT
(Load Out
Region)
R1
Figure 2
Load-Encroachment Characteristics
Overcurrent Elements
for Ground Fault Detection
Residual (IG) and neutral (I N) overcurrent elements
detect ground faults. Torque-control these elements with
optoisolated inputs or internal ground directional
elements for increased security. The ground directional
SEL-351 Data Sheet
element of this relay includes load-adaptive security
logic for heavily or lightly loaded unbalanced feeder
applications.
The SEL-351 includes time-overcurrent characteristics
matching five US and five IEC time-overcurrent curves.
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The negative-sequence directional element uses the same
patented principle proven in our SEL-321 Relay. This
directional element can be applied in virtually any
application (regardless of the amount of negativesequence voltage available at the relay location).
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Ground Directional Elements
US
These elements provide directional control to the ground
and neutral overcurrent elements.
IEC
I
Figure 3 Instantaneous, Definite-Time,
and Inverse Time-Overcurrent Characteristics
Table 1 lists the time-overcurrent curves that are
included.
Table 1
Time-Overcurrent Curves
US
IEC
Moderately Inverse
Class A (Standard Inverse)
Inverse
Class B (Very Inverse)
Very Inverse
Class C (Extremely Inverse)
Extremely Inverse
Long-Time Inverse
Short-Time Inverse
Short-Time Inverse
There are two reset characteristic choices for each timeovercurrent element. One choice resets the elements if
current drops below pickup for at least one cycle. The
other choice emulates electromechanical induction disc
elements, where the reset time depends on the time dial
setting, the percentage of disc travel, and the amount of
current.
Directional Elements
Increase Sensitivity and Security
Phase and ground directional elements are standard. The
new Best Choice Ground Directional Logic scheme
eliminates directional element settings. (You can
override this automatic setting feature for special
applications.)
Phase Directional Elements
Ground directionality is provided by three directional
elements working together:
➤ The same type of negative-sequence voltage-polarized element used in the phase directional element.
➤ A zero-sequence voltage-polarized directional element that uses the same principle as the negativesequence directional element.
➤ A traditional zero-sequence current-polarized
directional element.
This relay includes patented Best Choice Ground
Directional Logic. This logic selects the best ground
directional element for system conditions.
An automatic setting mode can set all directional
threshold settings for you, based on replica line
impedance settings.
Programmable Torque-Control
Feature Handles Cold-Load
Energization
When a feeder is reenergized following a prolonged
outage, lost load diversity causes large phase currents
(Cold-Load Inrush). Phase overcurrent element
misoperation during Cold-Load Inrush can be avoided by
programming cold-load block elements into the phase
overcurrent element torque controls. One example of a
cold-load block element is a time-delayed 52 status (long
time-delay pickup and dropout timer with 52 as the
input).
An alternative is to automatically detect the long outage
condition (breaker open) and temporarily switch to a
settings group with higher phase overcurrent element
pickup thresholds.
The phase directional elements provide directional
control to the phase and negative-sequence overcurrent
elements.
Under- and Overvoltage Elements
for Extra Protection and Control
The phase directional characteristics include positivesequence and negative-sequence directional elements,
which work together. The positive-sequence directional
element includes over 29 cycles of memory. Thus, this
directional element gives a reliable output even for closein, forward- or reverse-bolted, three-phase faults where
each phase voltage is zero.
Phase Under- and Overvoltage Elements
Twenty-three phase undervoltage (27) and overvoltage
(59) elements are included for creation of such protection
and control schemes as the following:
➤ Torque-control for the overcurrent protection.
➤ Hot-bus (line), dead-bus (line) recloser control.
SEL-351 Data Sheet
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➤ Blown transformer high-side fuse detection logic.
➤ Trip/alarm or event report triggers for voltage sags
and swells.
➤ An undervoltage (27) load shedding scheme. (Hav-
ing both 27 and 81U load shedding schemes allows
detection of system MVAR and MW deficient conditions.)
➤ Control schemes for capacitor banks.
➤ Simple load-tap changer control schemes.
The 27 and 59 elements associated with the V S voltage
channel are available for additional control and
monitoring:
hot-line/dead-line
recloser
control,
ungrounded capacitor neutrals, ground fault detection on
delta systems, generator neutral overvoltage, etc.
Sequence Under- and Overvoltage Elements
Four sequence 59 elements are included for protection
and control. Applications include the following:
➤ Transformer bank single-phasing trip schemes.
➤ Delta-load back-feed detection scheme for deadline recloser control.
➤ Independently settable positive-, negative-, and
zero-sequence overvoltage elements.
Secure Under- and Overfrequency
Protection
Six levels of under- (81U) or overfrequency (81O)
elements detect true frequency disturbances. Use the
independently time-delayed output of these elements to
shed load or trip local generation. Phase undervoltage
supervision prevents undesired frequency element
operation during faults.
The multiple 81 levels allow you to implement an
internal multistage frequency trip/restore scheme at each
breaker location and eliminates the need to wire a
complicated trip and control scheme from a separate
frequency relay.
Use the METER command to inspect system frequency,
or view the frequency column of the internal event report
to observe the frequency trend during a system
disturbance.
Use two levels of the frequency elements and timers as
frequency restoration logic control of the internal
recloser for automatic system restoration. Program the
restoration logic to an output contact to supervise
SCADA restoration.
SEL specifies the accuracy and overshoot (transient
response) of these precision frequency elements. For a
step frequency change of ±5 Hz, the steady-state plus
transient error is less than 0.01 Hz.
SEL-351 Data Sheet
Four-Shot Recloser Handles
Your Application Today and
Tomorrow
Internal element status or external inputs can condition
the recloser to match your practice:
➤ Reclose initiate (e.g., breaker status, fault type,
trip, etc.).
➤ Drive to lockout or last shot (e.g., input from manual or SCADA open, etc.).
➤ Skip shot (use 27/59 elements, fault current magnitude for last trip, etc.).
➤ Stall conditions for open interval timing.
➤ Sequence coordination to keep the relay in step
with downstream reclosers.
➤ Close failure delay.
➤ Separate reset times for reset timing from reclose
cycle or lockout.
The recloser shot counter can control which protective
elements are involved in each reclose interval.
Applications include fuse and trip-saving schemes.
Front-panel LEDs track the recloser state: Reset (RS),
Cycle (CY), and Lockout (LO).
Sequence-Coordination for Close
Downstream Device Coordination
Sequence coordination logic prevents the SEL-351 from
tripping for faults beyond a line recloser. The internal
recloser includes shot bits that indicate the recloser shot.
Use the SELOGIC control equation operators to enable or
block specific elements depending upon the state of the
shot counter. You program the elements into a sequence
coordination SELOGIC control equation variable whose
pickup and dropout signify the operation of the
downstream recloser. Pickup and dropout of this variable
cause the shot counter to increment.
Event Report and SER Features
Simplify and Accelerate Operation
Analysis
You select what triggers event reports. Event report
length is selectable: 15 or 30 cycles. The voltage, current,
frequency, and element status information contained in
each report confirms relay, scheme, and system
performance for every fault. The relay stores the most
recent fifteen 30-cycle or twenty-nine 15-cycle event
reports in nonvolatile memory. Decide how much detail
is necessary when you request an event report: 1/4-cycle
or 1/16-cycle resolution, filtered, or raw analog data.
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The 1/4-cycle report is one-fourth the size of the 1/16cycle report, and is, therefore, the fastest to retrieve and
analyze. This advantage is especially valuable following
a major disturbance. The full 1/16-sample/cycle report
can be retrieved when conditions warrant closer scrutiny.
The relay Sequential Events Recorder (SER) feature
stores the latest 512 entries. Use this feature to gain a
broad perspective at a glance. Items for triggering an
SER entry include input/output change of state
occurrences, element pickup/dropout, and recloser state
changes.
The IRIG-B time-code input synchronizes the SEL-351
time to within ±2 ms of the time-source input. A
convenient source for this time code is an SEL
communications processor (SEL-2032, SEL-2030,
SEL-2020).
Extensive RMS Metering
Capabilities
This relay provides extensive high-accuracy metering
capabilities. VA,B,C and IA,B,C metering accuracies are
0.25 percent of input at nominal frequency (for voltages:
33.5 V < VAC < 150 V, for currents: measured current is
greater than 10 percent of the nominal current rating).
Power measurement accuracies are better than ±0.50
percent.
Metered quantities include phase voltages and currents,
sequence voltages, and currents, power, frequency,
substation battery voltage, energy (including demand)
along with maximum/minimum logging of selected
quantities. All metered quantities are reported in primary
quantities.
The METER command displays the metered analog
quantities shown in Table 2.
Table 2
Metered Analog Quantities
Description
Phase:
VA, B, C, S
IA, B, C, G, N
Input voltages
Input currents (where IG is calculated from IA + IB + IC)
Power:
MWA, B, C, 3P
MVARA, B, C, 3P
Per-phase and three-phase megawatts
Per-phase and three-phase megavars
Power Factor:
PFA, B, C, 3P
Per-phase and three-phase power factor
Sequence:
V1, V2, 3V0
Sequence voltages (positive-, negative-, and zero-sequence)
Sequence currents (positive-, negative-, and zero-sequence)
I1, 3I2, 3V0
Energy
MWhA, B, C, 3P
MVARhA, B, C, 3P
Per-phase and three-phase megawatt hours. IN MWh measures incoming (–), OUT MWh measures
outgoing (+).
Per-phase and three-phase megavar hours. IN MVARh measures incoming (–), OUT MVARh measures
outgoing (+).
Frequency:
FREQ (Hz)
Power system frequency
Station DC:
VDC (V)
Present substation battery voltage at the relay
Demand Current Thresholds Alarm
for Overload and Unbalance
Settable demand current thresholds are available for
phase, negative-sequence, neutral, and residual demand
measurements. When demand current exceeds a
threshold, the respective Relay Word bit PDEM, QDEM,
NDEM, or GDEM asserts.
Two types of demand-measuring techniques are offered:
➤ thermal
➤ rolling
When you select thermal demand measuring, PDEM,
QDEM, NDEM, or GDEM alarms for phase overload,
negative-sequence unbalance, neutral unbalance, or
residual unbalance, respectively. Select the demand
ammeter time constant from 5 to 60 minutes.
Breaker Monitor Feature =
Intelligent Breaker Maintenance
Scheduling
Breakers experience mechanical and electrical wear
every time they operate. The breaker monitor feature
measures unfiltered ac current at the time of trip and the
number of close-to-open operations as a means of
monitoring this wear. Breaker manufacturers publish
maintenance curves and tables that relate interrupted
SEL-351 Data Sheet
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current to the number of close-to-open (C/O) operations.
These data are usually presented in a table in the
inspection and maintenance section of the breaker
manual.
Close to Open (C/O AXIS)
(COSP1, KASP1)
(COSP2, KASP2)
(COSP3, KASP3)
kA Interrupted (kA Axis)
Figure 4
Breaker Contact Wear Curve and Settings
Every time the breaker trips, the relay records the
magnitude of the raw current in each phase. This current
information is integrated. When the result of this
integration exceeds the threshold set by the breaker wear
curve (Figure 4), the relay asserts the corresponding
Breaker Contact Wear Alarm bit: BCWA, BCWB, or
BCWC. This method of monitoring breaker wear is
solidly based on breaker ratings from the breaker
manufacturer.
Substation Battery Monitor for
DC Quality Assurance
The relay measures, tests, and reports the substation
battery voltage presented to the power supply terminals.
The relay includes two settable threshold comparators
and associated Relay Word bits (DCLO, DCHI) for
alarm and control. For example, if the battery charger
fails, the measured dc falls below the DCHI pickup
threshold and DCHI drops out. Program this bit to a b
contact connected to SCADA or an annunciator panel to
notify operation personnel before the substation battery
voltage falls to dangerous levels. Monitor the DCHI bit
with an SEL communications processor and trigger
messages, telephone calls, or other actions.
The measured dc voltage is reported in the METER display
and the VDC column of the event report. Use the event
report column data to see an oscillographic display of the
battery voltage. You can see how much the substation
battery voltage drops during trip, close, and other control
operations.
SEL-351 Data Sheet
Fault Locator Reduces Line Patrol
and Outage Time
The relay accurately locates all faults, even during
periods of substantial load flow. The fault locator uses
fault type, replica line impedance settings, and fault
conditions to provide an accurate estimate of fault
location without communications channels, special
instrument transformers, or prefault information.
Six Independent Settings Groups
Increase Operation Flexibility
The relay stores six settings groups. Select the active
settings group by contact input, command, or other
programmable conditions. Use these settings groups to
cover a wide range of protection and control
contingencies. Selectable settings groups make the
SEL-351 ideal for applications requiring frequent setting
changes and for adapting the protection to changing
system conditions.
When you switch groups, you switch logic settings as
well as relay element settings. Groups can be
programmed for different operating conditions, such as
feeder paralleling, station maintenance, seasonal
operations, emergency contingencies, loading, source
changes, and downstream relay setting changes.
Loss-of-Potential Logic Validates
Three-Phase Voltage Inputs
Relay functions that use all three phase voltages or that
use symmetrical component voltages rely upon valid
input voltages to make the correct decisions (e.g.,
metering, directional elements, fault location). The
SEL-351 includes loss-of-potential logic that detects
one, two, or three blown potential fuses. This logic is
unique because it does not require settings and is
applicable in all applications (patent pending).
Communications Scheme Logic
for Rapid Fault Clearance
Communications are becoming available at lower
voltages and can be used to improve sensitivity,
coordination, and speed of protection. The SEL-351 is
the ideal relay for use in transmission and distribution
feeder communications-based tripping schemes.
Supported schemes include the following:
➤ Permissive Overreaching Transfer Tripping
(POTT) for two- or three-terminal lines
➤ Directional Comparison Unblocking (DCUB) for
two- or three-terminal lines
➤ Directional Comparison Blocking (DCB)
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➤ Permissive and Direct Underreaching Transfer Trip
(PUTT and DUTT, respectively)
➤ Direct Transfer Tripping (DTT)
Use the SELOGIC control equation TRCOMM to
program specific elements, combinations of elements,
inputs, etc., to perform communication scheme tripping
and other scheme functions. The communication logic of
this relay easily handles the following challenges:
➤ Current reversals
➤ Breaker open at one terminal
➤ Weak-infeed conditions at one terminal
➤ Switch-onto-fault conditions
Time-step and time-overcurrent protection ensures
reliable operation should the channel be lost.
Table 3
Operator Controls and
Serial Communications
➤ Two or three EIA-232 serial ports and one isolated
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EIA-485 serial port. Each serial port operates independently of the other serial ports.
Full access to event history, relay status, and meter
information from the serial ports.
Settings and group switching have password control.
DNP Version 3.0 Level 2 protocol with point mapping (optional).
Open communications protocols (shown in
Table 3) that are nonproprietary:
Open Communications Protocols
Protocol
Description
Simple ASCII
Plain-language commands for human and simple machine communications.
Use for metering, setting, self-test status, event reporting, and other functions.
Compressed
ASCII
Comma-delimited ASCII data reports. Allows an external device to obtain relay data in a format that directly imports into
a spreadsheet or database program. Data are checksum protected.
Extended Fast
Meter
Binary protocol for machine-machine communications.
Quickly updates SEL communications processors, RTU, other substation devices with metering information, relay
element, input, and output statuses, time-tags, open and close commands, and summary event reports. Data are checksum
protected.
Binary and ASCII protocols operates simultaneously over the same communications lines such that there is no loss of
control operator metering information while a technician transfers an event report.
LMD
Enables multiple SEL devices to share common communications (two-character address setting range is 01 to 99). LMD is
appropriate for low-cost, low-speed port switching applications where updating a real-time database is not a requirement.
The relay does not require special communications
software. Dumb terminals, printing terminals, or a
computer supplied with terminal emulation and a serial
communications port is all that is required.
Event Reporting and Oscillography
The relay generates event reports to capture system
disturbances or to take snapshots of line terminal
conditions (examples include direction checking,
substation battery level, etc.). The relay stores the most
recent 30-cycle or 15-cycle event reports in nonvolatile
memory. The number of reports stored depends on report
length and the relay options you ordered.
There are multiple analog data formats available. You
select the desired format via command extensions to the
event report command. These formats are the following:
➤ 1/4-cycle or 1/16-cycle resolution
➤ Unfiltered or filtered analog
➤ ASCII or Compressed ASCII
Relay settings are always appended to the bottom of each
event report.
This information simplifies postfault analysis and
improves understanding of simple and complex
protective scheme operation.
Advanced SELOGIC Control Equations
Advanced SELOGIC control equations put relay logic in
the hands of the relay application engineer. Assign the
relay inputs to suit your application, logically combine
selected relay elements for various control functions, and
assign output relays to your logic functions.
Programming SELOGIC control equations consists of
combining relay elements, inputs, and outputs with
SELOGIC control equation operators. Any element in the
Relay Word can be used in these equations.
Use this Boolean-type logic to do the following:
➤ Define which elements or conditions control each
output contact (except ALARM).
➤ Define the function of the digital inputs. For example, use this feature to switch between the six available settings groups, using internal conditions such
as demand meter outputs or load flow direction as
detected by the load-encroachment detection logic.
SEL-351 Data Sheet
10
➤ Define which elements and conditions trigger
➤
➤
➤
➤
➤
event reports.
Define which elements and conditions add entries
to the sequential events report.
Select the elements that trip for switch-onto-fault
conditions, unconditionally, with the assistance of
communications scheme logic.
Define reclose initiate, cancel, stall, and shot skip
conditions.
Create breaker trip and close circuit monitoring
logic.
Implement momentary change detection logic to
enhance system integration.
Configure the contact outputs to operate when any of the
protective elements and/or logic outputs assert.
Implement complete protective schemes, using a
minimum of wiring and panel space. Programmable
contact closure simplifies testing by indicating pickup
and dropout of only those elements under test.
Flexible Control Logic
Use the SEL-351 control logic to do the following:
➤ Replace traditional panel control switches.
➤ Eliminate RTU-to-relay wiring.
➤ Replace traditional latching relays.
➤ Replace traditional indicating panel lights.
Local control logic provides eight* logic points (local
bits). Set, clear, or pulse the local bits at the front-panel
pushbuttons and display. Program the local bits into your
control scheme via the SELOGIC control equations. Use
the local bits to enable/disable reclosing, trip/close the
breaker, etc. Eliminate traditional panel control switches.
Remote control logic provides eight* logic points
(remote bits). Set, clear, or pulse the remote bits via
serial port commands. Program the remote bits into your
control scheme via SELOGIC control equations. Use the
remote bits for SCADA-type control operations: trip,
close, and settings group selection, etc. Eliminate RTUto-relay wiring.
Latch logic provides eight* latching logic points (latch
bits). Program the latch set and latch reset conditions
with SELOGIC control equations. Set or reset the latch
bits via optoisolated inputs, remote bits, or local bits.
Replace traditional latching relays for such functions as
hot line tagging. The latch bits retain their state when the
relay loses power.
Display logic provides eight* programmable front-panel
display messages. Define custom messages (e.g.,
BREAKER OPEN, BREAKER CLOSED, RECLOSER ENABLED) to
report power system or relay conditions. Use SELOGIC
control equations to control which messages display;
drive the display via any logical point in the relay.
Replace traditional indicating panel lights.
SEL-351 Data Sheet
* Sixteen local bits, remote bits, latch bits, and display
points with the Integration Package.
Integration Package (option)
This package adds system-wide Sequential Events
Recorder (SER) capabilities to the SEL-351. A similar
integration package available for the SEL-387 Relay
works with an SER-capable version of the SEL-2032 or
SEL-2030 Communications Processor to provide for
station-wide Sequential Events Recorder (SER) data
collection and reporting to your host computer system.
This package doubles the number of local bits, remote
bits, latch bits, and display points in the SEL-351 (see
previous subsection) to simplify panel design (e.g.,
eliminating external control switches, latching relays,
and indicators). The SEL-387 with the integration
package has similar features, so system design is simpler
and more consistent.
SEL MIRRORED BITS
Communications
The SEL MIRRORED BITS communications technology
provides
bidirectional
relay-to-relay
digital
communications. Figure 5 gives an example application.
MIRRORED BITS communications can operate
independently on as many as two EIA-232 serial ports on
a single SEL-351 for communications upstream and
downstream from the relay location.
Other
Relays
SEL-2815
SEL-351
Other
Relays
SEL-2815
TX
RX
TX
RX
SEL-351
Fiber-Optic Cable
1
Bus 1
Transmission Line
2
Bus 2
Figure 5 Improve Service Reliability for Load With Two
SEL-351 Relays Communicating Over Fiber-Optic Cable
This bidirectional digital communication uses eight
additional virtual outputs (transmitted MIRRORED BITS
elements) and eight additional virtual inputs (received
MIRRORED BITS elements) for each serial port operating
in the MIRRORED BITS communications mode. These
MIRRORED BITS communications elements can be used
to transmit/receive information in communications-aided
tripping schemes (e.g., permissive overreaching transfer
tripping) and other control functions (e.g., cancel
reclosing or direct transfer trip). MIRRORED BITS
communications also helps reduce total scheme
operating time by eliminating the need to assert output
contacts to transmit information.
11
SEL-351 Models
The model numbers are derived from the SEL-351 ordering information sheet. The model numbers in Table 4 are only
the first part of an actual ordering number—enough to distinguish one model type from another. Do not use these
numbers to order an SEL-351. Contact your SEL representative for ordering assistance.
Table 4
SEL-351 Models
SEL-351
Model
Number
Rack Unit
Height and
Mounting
# Optoisolated Inputs/
Output Contacts (I/O)
Rear-Panel
Connection Type
Output
Contact Type
Communications
Ports
EIA-232
EIA-485
0351xT
2U Horizontal
8/12
plug-in connector
standard
or
high-current interrupting
2
1
0351x0
2U Horizontal
6/8
screw-terminal block
standard
3
1
0351x1
3U Horizontal
or Vertical
6/8 (main board)
3
1
8/12 (extra I/O board)
standard
or
high-current interrupting
3
1
0351xY
3U Horizontal
or Vertical
same as 0351x1
plug-in connectors
same as 0351x1
3
1
SEL-351 Data Sheet
12
AC Connections (Typical)
Power Transformer
Bus
A (C)
B
C (A)
A(C)
ROTATION
B
VA
VB
VC
N
IA
IB
IB
IC
IC
IN
IN
VS
NS
52-1
Line 1
Figure 6
VA
VB
VC
N
IA
Forward Trip Direction
Forward Trip Direction
C(A)
SEL-351 (Partial)
SEL-351 (Partial)
52-2
Line 2
Two SEL-351 Relays With Typical AC External Current and Voltage Connections
SEL-351 Data Sheet
13
DC Connections (Typical)
+Vdc
Z15
A24
Z16
PS
Z17
A23
A21
OUT11
ALARM
A22
A20
OUT10
A19
OUT9
A18
A15
A17
OUT8
A16
A14
A13
A11
OUT7
OUT6
A12
A10
A40
OUT5
A38
A09
A36
A08
A34
52C
OUT4
A32
52a
52T
A07
A30
52a
A06
A28
Optional
Connections
OUT3
A39
IN8
A05
A37
IN7
A04
A35
IN6
OUT2
A33
IN5
A03
A31
IN4
A02
A29
IN3
OUT1
A27
IN2
A01
A25
IN1
A26
SEL-351 (Partial)
Optional Connections
52b
Annunciator, RTU
or SEL-2032
(SEL-2020, SEL-2030)
-Vdc
Figure 7
SEL-351 Typical Minimum DC External Connections (Model 03510M)
SEL-351 Data Sheet
14
Communications Connections (Typical)
Data And Time-Synchronization Connections
SEL-2032
Communications
Processor
SEL-2032
Communications
Processor
Fiber-Optic
Cable #C273AFZ
or #C273AFD
(Metallic)
Cable
#C273A
SEL-2810
Port 2
SEL-351 Relay
SEL-351 Relay
Port 2
SEL-351 Relay
Optical Cable Connection
Metallic Cable Connection
EIA-485 Connections
Computer
Port 1
Port 1
SEL-351 Relay (#1)
Port 1
SEL-351 Relay (#2)
SEL-351 Relay (#32)
Local Connections
Connect to the
SEL-2032 once
and communicate
with any connected
SEL relay
Front Panel
SEL-2032
Port 2
Port 2
Rear Panel
or . . .
Connect to the SEL-351
relays individually via
the front-panel serial port
Figure 8
SEL-351 Relay (#1)
#C234A
SEL-351 Relay (#2)
Front Panel
Port F
Port F
SEL-351 Communications Connections Examples
SEL-351 Data Sheet
15
Front- and Rear-Panel Drawings
Figure 9
SEL-351 Front- and Rear-Panel Drawings (Model 0351xT)
SEL-351 Data Sheet
16
IN1
A25
A01
OUT1
A26
A02
IN2
A30
Output Contacts:
If the output contacts are
high-current interrupting output
contacts, they are polarity dependent.
Channel IN:
For Sensitive Earth
Fault (SEF) applications,
the SEL-351 can be ordered with
channel IN rated at 0.05 A nominal.
IN4
A31
A32
IN5
A33
A34
IN6
A35
A36
IN7
A37
A04
PROGRAMMABLE OPTOISOLATED INPUTS
IN3
A29
A03
OUT2
A28
PROGRAMMABLE OUTPUT CONTACTS
A27
A05
OUT3
A06
A07
OUT4
A08
A09
OUT5
A10
A11
OUT6
A12
A13
OUT7
A38
A14
IN8
A39
A40
A16
VB
Z10
(VBC)
VC
Z11
N
Z12
VS
Z13
NS
Z14
(VCA)
(Not Connected)
(VS)
Z02
IB
Z03
Z04
IC
Z05
Z06
JUMPER CONFIGURABLE
(VAB)
Z10
Z11
VB
VC
Z12
N
Z13
VS
Z14
NS
OUT11*
A21
ALARM
A23
A22
+
-
PORT 2 (REAR)
EIA-232 and IRIG-B
DB9
PORT F (FRONT)
EIA-232
DB9
POWER
SUPPLY
BATTERY
MONITOR
CHASSIS
GROUND
ISOLATED EIA-485
A A A A A
4 4 4 4 4
1 2 3 4 5
PORT 1 (REAR)
FRONT PANEL TARGET LEDS
EN
Z17
A20
A24
VOLTAGE INPUTS
VA
Z16
A19
OUT10
* OUT11 CAN OPERATE AS EXTRA ALARM
Z09
Z15
A18
IN
Z07
Z08
Figure 10
A17
OUT9
IA
Z01
Z09
VA
A15
OUT8
CURRENT INPUTS
Delta-Connected Voltages:
SEL-351 Relays ordered with
delta-connected voltage inputs
are internally configured as shown below.
A
TRIP INST COMM SOTF
B
C
G
FAULT TYPE
N
50
51
81
RS
CY
79
LO
SEL-351 Inputs, Outputs, and Communications Ports (Model 0351xT)
SEL-351 Data Sheet
17
Figure 11
SEL-351 Front- and Rear-Panel Drawings (Model 0351x0)
SEL-351 Data Sheet
18
IN101
IN102
A20
A21
IN102
A22
Channel IN:
For Sensitive Earth
Fault (SEF) applications,
the SEL-351 can be ordered with
channel IN rated at 0.05 A nominal.
A24
Delta-Connected Voltages:
SEL-351 Relays ordered with
delta-connected voltage inputs
are internally configured as shown below.
A28
A23
A25
IN102
IN102
A26
A27
IN102
A02
A03
OUT102
A04
JUMPER CONFIGURABLE
A19
A01
OUT101
A18
A17
A05
OUT103
A06
A07
OUT104
A08
A09
OUT105
A10
A11
OUT106
A12
A13
OUT107
A14
IA
Z01
Z04
Z09
(VAB)
Z05
VB
Z10
(VBC)
Z06
VC
Z11
N
Z12
VS
Z13
NS
Z14
(VCA)
(Not Connected)
IC
CURRENT INPUTS
A16
IB
Z03
VA
A15
ALARM
Z02
IN
Z07
* OUT107 CAN OPERATE AS EXTRA ALARM
PORT 1
(REAR)
Z08
IRIG-B
+–
ISOLATED
EIA-485
1
2 3 4 5 6 7 8
(VS)
VA
Z10
Z11
VB
VC
Z12
N
Z13
VS
Z14
NS
EIA-232 and IRIG-B
VOLTAGE INPUTS
Z09
PORT 2 (REAR)
DB9
EIA-232
PORT 3 (REAR)
DB9
EIA-232
PORT F (FRONT)
Z25
Z26
Z27
+
–
DB9
FRONT PANEL TARGET LEDS
POWER
SUPPLY
EN
BATTERY
MONITOR
A
TRIP INST COMM SOTF
B
C
G
FAULT TYPE
N
50
51
81
RS
CY
79
LO
CHASSIS
GROUND
Figure 12 SEL-351 Inputs, Outputs, and Communications Ports
(Models 0351x1 and 0351xY Have an Extra I/O Board—Refer to Figure 15)
SEL-351 Data Sheet
19
Figure 13 SEL-351 Front- and Rear-Panel Drawings–Model 0351x1 Rear and Models 0351x1 and 0351xY Front
(Horizontal)
SEL-351 Data Sheet
20
Top
Top
Figure 14 SEL-351 Front- and Rear-Panel Drawings–Model 0351xY Rear and Models 0351x1 and 0351xY Front
(Vertical)
SEL-351 Data Sheet
21
B01
OUT202
B02
B03
B04
Output Contacts:
If the output contacts are
high-current interrupting output
contacts, they are polarity dependent.
OUT201
OUT203
B05
B06
OUT204
B07
B08
OUT205
B09
B10
OUT206
B11
B12
OUT207
B13
B14
OUT208
B15
JUMPER CONFIGURABLE
B16
B25
OUT209
B17
OUT210
B18
B19
B20
OUT211
B21
B22
OUT212
B23
B24
IN201
B27
IN202
B28
B29
IN203
B30
B31
IN204
B32
B33
IN205
B34
B35
IN206
B36
B37
B26
IN207
B38
B39
IN208
B40
Figure 15
SEL-351 Extra I/O Board (Model 0351x1 and 0351xY; main board shown in Figure 12)
SEL-351 Data Sheet
22
Relay Mounting
Figure 16
SEL-351 Dimensions, Panel Cutout, and Drill Plan
To better understand Figure 16, refer to Table 4 for rack unit height information on the SEL-351 models (2U or 3U-no
4U model is available). Also, note at the top of Figure 16 that the dimension of the relay projecting behind the rear panel
is dependent on the rear-panel connection type (connection type information is also available in Table 4).
SEL-351 Data Sheet
23
Specifications
Note: Do not use the following specification information to order an SEL-351 Relay. Refer to the ordering information
sheets.
Sectio n 1
Intro duction and Specification s U.Us er’s Guide
Output Contacts
``
General
Standard
AC Current Input
Nominal:
Continuous:
15 A, 500 A for 1 second, linear to 100
A symmetrical. 1250 A for 1 cycle.
Burden:
0.27 VA at 5 A, 2.51 VA @ 15 A
Nominal:
Continuous:
Burden:
Sensitive Earth Fault
Nominal:
1A
3 A, 100 A for 1 second, linear to 20 A
symmetrical. 250 A for 1 cycle.
0.13 VA at 1 A, 1.31 VA at 3 A
0.05 A, channel IN current input
Continuous:
1.5 A, 20 A for 1 second, linear to 1.5 A
symmetrical.
Burden:
0.0004 VA at 0.05 A, 0.36 VA at 1.5 A.
AC Voltage Inputs
Nominal:
150 VL–N, three-phase four-wire (wye)
connection.
Continuous:
150 V (connect any voltage from 0 to
150 Vac. 365 Vac for 10 seconds.
Burden:
0.13 VA at 67 V; 0.45 VA at 120 V.
Nominal:
Carry:
6 A continuous carry at 70°C
1s Rating:
50 A
MOV Protection
(Maximum Voltage):
270 Vac/360 Vdc, 40 J
Pickup Time:
Less than 5 ms.
Dropout Time:
Less than 8 ms, typical
5A
300 VL–N, three-phase four-wire (wye)
connection.
Breaking Capacity (10000 Operations):
24 V
48 V
125 V
250 V
0.75 A
0.50 A
0.30 A
0.20 A
L/R = 40 ms
L/R = 40 ms
L/R = 40 ms
L/R = 40 ms
Cyclic Capacity (2.5 cycles/second):
24 V
48 V
125 V
250 V
0.75 A
0.50 A
0.30 A
0.20 A
L/R = 40 ms
L/R = 40 ms
L/R = 40 ms
L/R = 40 ms
High-Current Interruption Option
Carry:
1s Rating:
50 A
MOV Protection
(Maximum Voltage):
330 Vdc, 40 J
Continuous:
300 V continuous (connect any voltage
from 0 to 300 VAC). 600 Vac for 10
seconds.
Pickup Time:
Less than 5 ms
Dropout Time:
Less than 8 ms, typical
Burden:
0.03 VA at 67 V; 0.06 VA at 120 V; 0.8
VA at 300 V.
Breaking Capacity (10000 Operations):
Nominal:
300 VL–L, three-phase three-wire (delta)
connection.
Continuous:
Burden:
300 V continuous (connect any voltage
from 0 to 300 Vac). 600 Vac for 10
seconds
0.03 VA at 67 V; 0.06 VA at 120 V; 0.8
VA at 300 V.
Frequency and Rotation
24 V
48 V
125 V
250 V
10 A
10 A
10 A
10 A
L/R = 40 ms
L/R = 40 ms
L/R = 40 ms
L/R = 20 ms
Cyclic Capacity (4 cycles in 1 second followed by 2 minutes idle for
thermal dissipation):
24 V
48 V
125 V
250 V
10 A
10 A
10 A
10 A
L/R = 40 ms
L/R = 40 ms
L/R = 40 ms
L/R = 20 ms
System Frequency:
60/50 Hz (user settable)
Phase Rotation:
ABC/ACB (user settable)
Note: Do not use high-current interrupting output contacts to switch ac
control signals. These outputs are polarity dependent.
Frequency Tracking
Range:
40.1–65 Hz (VA required for frequency
tracking)
Note: Make per IEEE C37.90: 1989; Breaking and Cyclic Capacity per
IEC 50255-0-20: 1974.
Optoisolated Inputs
Power Supply
Rated:
Range:
Burden:
Rated:
Range:
Burden:
Rated:
125/250 Vdc or Vac
85–350 Vdc or 85–264 Vac
<25 W
When Used With DC Control Signals:
250 Vdc:
on for 200–300 Vdc;
off below 150 Vdc
125 Vdc:
off below 75 Vdc
110 Vdc:
off below 66 Vdc
48 Vdc:
on for 38.4–60 Vdc;
off below 28.8 Vdc
24 Vdc:
on for 15–30 Vdc
48/125 Vdc or 125 Vac
38–200 Vdc or 85–140 Vac
<25 W
24/48 Vdc
Range:
18–60 Vdc polarity dependent
Burden:
<25 W
SEL-351 Data Sheet
24
When Used With AC Control Signals:
250 Vdc:
on for 170.6–300.0 Vdc;
off below 106.0 Vdc
125 Vdc:
on for 89.6–150.0 Vdc;
off below 53.0 Vdc
110 Vdc:
on for 75.1–132.0 Vdc;
off below 46.6 Vdc
48 Vdc:
on for 32.8–60.0 Vdc;
off below 20.3 Vdc
24 Vdc:
on for 12.8–30.0 Vdc
Note: AC mode is selectable for each input via Global settings IN1D–
IN8D, IN101D–IN106D; IN201D–IN208D. AC input recognition
delay from time of switching: 0.75 cycle maximum pickup; 1.25
cycles maximum dropout.
Note: 24, 48, 125, and 250 Vdc optoisolated inputs draw
approximately 5 mA of current, 110 Vdc inputs draw approximately
8 mA of current. All current ratings are at nominal input voltages.
Time-Code Input
Relay accepts demodulated IRIG-B time-code input at Port 2. Relay
time is synchronized to within ±5 ms of time-source input.
Impulse:
IEC 60255-5 Dielectric Tests: 1977 are
performed on all units with the CE
mark:
2500 Vac for 10 seconds on analog
inputs
3100 Vdc for 10 seconds on power
supply, optoisolated inputs, and output
contacts
Electrostatic Discharge Test
ESD:
IEC 60255-22-2 (1996)
Severity Level 4 (8 kV contact discharge
all points except serial ports, 15 kv air
discharge to all other points (type test)
RFI and Interference Tests
Electromagnetic
Compatibility (EMC):
IEC 60801-4 (1988)
Severity Level 4 (4 kV on power supply,
2 kV on inputs and outputs) (type test)
Radiated EMI:
IEC 60255-22-3 (1989), Severity Level 3
(10 V/m) (type test)
Surge Withstand:
IEC 60255-22-1 (1988)
Severity Level 3 (2.5 kV common mode,
1.0 kV differential (type test)
IEEE C37.90.2 10 V/m (type test)
Exceptions: 5.5.2(2) Performed with
200 frequency steps per octave; 5.5.3
Digital Equipment Modulation Test not
performed; 5.5.4 Test signal turned off
between frequency steps to simulate
keying.
Communications Ports
EIA-232:
1 front, 1 rear panel (Model 0351xT;
1 front, 2 rear panel (Models 0351x0,
0351x1, and 0351xY)
EIA-485:
1 rear panel with 2100 Vdc of isolation
(all models)
Data Speed:
300, 1200, 2400, 4800, 9600, 19200,
38400 bps
Dimensions
Vibration and Shock Tests
Shock and Bump:
IEC 60255-21-2 (1988),
Shock withstand and bump, Class 1
Shock response, Class 2
IEC 60255-21-3 (1993)
Quake response, Class 2
Sinusoidal Vibration:
IEC 60255-21-1 (1988)
Vibration endurance, Class 1
Vibration response, Class 1
See Figure 16.
Operating Temperature
–40 to +85C (–40 to +185F) (type test)
(LCD contrast impaired for temperatures below –20°C)
Weight
5.92 kg (13 lbs)–2U rack unit height relay
7.24 kg (16 lbs)–3U rack unit height relay
Type Tests
Cold:
IEC 60068-2-1 (1990)
Basic environmental testing procedures,
Part 2: Tests - Test Ad: Cold (type test)
Damp Heat, Cyclic:
IEC 60068-2-30 (1980)
1980 Basic environmental testing
procedures, Part 2: Tests, Test Db and
guidance: Damp heat, cyclic (12 + 12hour cycle), (six-day type test)
Dry Heat:
IEC 60068-2-2 (1974)
Basic environmental testing procedures,
Part 2: Tests - Test Bd: Dry Heat (type
test)
IEC 60529: 1989-11 Degrees of
Protection Provided by Enclosures IP30, IP54 from the front panel using
the SEL-9103 Front Cover Dust and
Splash Protection (type test)
Dielectric Strength and Impulse Tests
Minimum: 0.8 Nm (7-in-lb)
Maximum: 1.4 Nm (12-in lb)
Tightening Torque,
Connectorized:
Minimum: 0.5 Nm (4.4-in-lb)
Maximum: 1.0 Nm (8.8-in-lb)
Certifications
ISO: Relay designed and manufactured using ISO-9001 certified
quality program.
CE
Processing Specifications
AC Voltage and Current Inputs
16 samples per power system cycle, 3 dB low-pass filter cutoff
frequency of 560 Hz
Digital Filtering
One-cycle full cosine after low-pass analog filtering. Net filtering
(analog plus digital) rejects dc and all harmonics greater than the
fundamental.
Protection and Control Processing
4 times per power system cycle
Strength
Current Inputs:
2500 Vac for 10 seconds
Power Supply,
Optoisolated Inputs,
and Output Contacts:
3000 Vdc for 10 seconds
SEL-351 Data Sheet
Tightening Torque,
Terminal Block:
Note: Terminal Connections: Terminals or stranded copper wire. Ring
terminals are recommended. Minimum temperature rating of 105°C.
Environmental Tests
Protection
Provided by Enclosures:
Terminal Connections
25
Relay Elements
Synchronism-Check Elements
Instantaneous/Definite-Time Overcurrent Elements
Pickup Range
5 A Nominal:
0.25–100.00 A, 0.01 A steps
1.00–170.00 A, 0.01 A steps (phase-tophase elements)
1 A Nominal:
0.05–20.00 A, 0.01 A steps
0.20–34.00 A, 0.01 A steps (phase-tophase elements)
0.05 A Nominal:
0.005–1.500 A, 0.001 A steps (channel
IN current input)
Steady-State Pickup Accuracy
5 A Nominal:
±0.05 A and ±3% of setting
1 A Nominal:
0.05 A Nominal:
±1 mA and ±5% of setting (channel IN
current input
Transient Overreach:
±5% of pickup
Time Delay:
0.00–16,000.00 cycles, 0.25-cycle steps
Timer Accuracy:
±0.25 cycle and ±0.1% of setting
Undervoltage Frequency
Element Block Range:
12.50–150.00 V (150 V wye)
25.00–300.00 V (300 V wye)
34.00–260.00 V (300 V delta)
Time-Overcurrent Elements
Slip Frequency Pickup
Range:
0.005–0.500 Hz, 0.001 Hz steps
Slip Frequency Pickup
Accuracy:
±0.003 Hz
Phase Angle Range:
0–80°, 1° steps
Phase Angle Accuracy:
±4°
Under- and Overfrequency Elements
Pickup Range:
40.10–65.00 Hz, 0.01 Hz steps
Steady-State Plus Transient
Overshoot:
±0.01 Hz
Time Delay:
Timer Accuracy:
±0.25 cycle and ±0.1% of setting
Timers
Pickup Range
Reclosing Relay and
Some Programmable
Timers:
Some Programmable and
Other Various Timers: 0.00–16,000.00 cycles, 0.25-cycle steps
Pickup and Dropout
Accuracy for All Timers: ±0.25 cycle and ±0.1% of setting
Substation Battery Voltage Monitor
Pickup Range
5 A Nominal:
0.50–16.00 A, 0.01 A steps
1 A Nominal:
0.10–3.20 A, 0.01A steps
0.05 A Nominal:
0.005–0.160 A, 0.001 A steps (channel
IN current input)
5 A Nominal:
1 A Nominal:
0.05 A Nominal:
±1 mA and ±5% of setting (channel IN
current input
Time Dial Range
Pickup Range:
20–300 Vdc, 1 Vdc steps
Pickup Accuracy:
±2% of setting
Metering Accuracy
Accuracies are specified at 20°C and at nominal system frequency
unless noted otherwise.
Voltages VA, VB, VC, VS, 3V0, V1, V2, VAB, VBC, VCA, VS, V1, V2
150 V Voltage Inputs:
±0.1% (33.5–150 V; wye-connected)
±0.2% (67.0–300 V; wye-connected)
±0.3% (33.5–260 V; delta-connected)
Currents IA, IB, IC
US:
0.50–15.00, 0.01 steps
5 A Nominal:
±1 mA and ±0.1% (0.5–10 A)
IEC:
0.05–1.00, 0.01 steps
1 A Nominal:
±0.2 mA and ±0.1% (0.1–2 A)
Curve Timing Accuracy:
±1.50 cycles and ±4% of curve time for
current between 2 and 30 multiples of
pickup
Under- and Overvoltage Elements
Pickup Range
0.00–150.00 V, 0.01 V steps (various
elements)
0.00–300.00 V, 0.01 V steps (various
elements)
0.00–260.00 V, 0.01 V steps (phase-tophase elements)
0.00–520.00 V, 0.01 V steps (phase-tophase elements)
Temperature Coefficient: [(0.0002%)/)°C)2] * (_°C–20°C)2
(see example below)
Currents IN, I1, 3I0, 3I2
5 A Nominal:
±0.05 A and ±3% (0.5–100 A)
1 A Nominal:
±0.01 A and ±3% (0.1–20 A)
0.05 A Nominal:
±1 mA and ±5% (0.01–1.5 A channel IN
current input)
Phase Angle Accuracy:
±0.5°
Transient Overreach:
±1 V and ±5% of setting
±2 V and ±5% of setting
±5% of pickup
SEL-351 Data Sheet
26
MW/MVAR (A, B, C, and
3-phase; 5 A nominal;
wye-connected voltages:
Accuracy (MW/MVAR) at load angle
for 0.5 A s phase current A s:
0.70%/–
0° or 180° (unity power factor)
0.75%/6.50%
±8° or ±172°
1.00%/2.00%
±30° or ±150°
1.50%/1.50%
±45° or ±135°
2.00%/1.00%
±60° or ± 120°
6.50%/0.75%
±82° or ±98°
– /0.70%
±90° (power factor = 0)
for phase current A s:
0.35%/–
0° or 180° (unity power factor)
0.40%/6.00%
±8° or ±172°
0.75%/1.50%
±30° or ±150°
1.00%/1.00%
±45° or ±135°
1.50%/0.75%
±60° or ±120°
6.00%/0.40%
±82° or ±98°
–/0.35%
±90° (power factor = 0)
Metering accuracy calculation example for currents IA, IB, and IC
resulting from preceding stated temperature coefficient:
For temperature of 40°C, the additional error for currents IA, IB, and
IC is:
[(0.0002%)/(°C)2] • (40°C–20°C)2 = 0.08%
Power Element Accuracy
Pickup
1 A Nominal:
±0.005 A • (voltage secondary)
and ±5% of setting at unity power factor
5 A Nominal:
±0.025 A • (voltage secondary)
and ±5% of setting at unity power factor
SEL-351 Data Sheet
27
Notes
SEL-351 Data Sheet
28
© 2003–2011 by Schweitzer Engineering Laboratories, Inc. All rights reserved.
All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. No SEL trademarks may be used without written permission.
SEL products appearing in this document may be covered by US and Foreign patents.
Schweitzer Engineering Laboratories, Inc. reserves all rights and benefits afforded under federal and international copyright and patent laws in its products, including without limitation
software, firmware, and documentation.
SCHWEITZER ENGINEERING LABORATORIES
2350 NE Hopkins Court • Pullman, WA 99163-5603 USA
Phone: +1.509.332.1890 • Fax: +1.509.332.7990
Internet: www.selinc.com • E-mail: [email protected]
The information in this document is provided for informational use only and is subject to
change without notice. Schweitzer Engineering Laboratories, Inc. has approved only the
English language document.
This product is covered by the standard SEL 10-year warranty. For warranty details, visit
www.selinc.com or contact your customer service representative.
SEL-351 Data Sheet
*PDS351-01*
Date Code 20110513

SEL-351 Distribution and Transmission Relay Standard Features

Transcription

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