TANTRANSCO

Transcription

TANTRANSCO

TANTRANSCO
Auto/Power Transformer:
Monthly Maintenance – without shutdown activity
Month
………………
Sl. No. Description
Date
1
Voltage Ratio
2
Date of commission
3
Make
4
Rating
5
Sl.No.
6
Bushing oil level
7
Conservator oil level
8
OLTC con’ oil level
9
Manual starting of
Fan and Pumps
10
Checking of oil leak
11
Breather oil level
12
Silica Gel condition
Auto I
Auto II
Assistant Executive Engineer /Maintenance
1
Auto III
Assistant Engineer/Maintenance
TANTRANSCO
Auto/Power Transformer
Monthly Maintenance – with shutdown activity
Month
………………
Sl.No. Description of Activity
Auto I
Date
1
Inspection of Bushings
For cracks etc.,
2
Checking of oil level in
Conservator tank
3
Checking of PRV
4
Checking of Fan and pump
operation for auto/manual
5
Checking of fan and pump
fail alarms
6
Checking of cooler supply
fail alarm
7
Checking of gas collection
in Buchholz
8
Check Buchholz operation
9
Check tightness of bushing
terminal clamps
10
Cleaning of bushings
11
Inspection and cleaning of
breather
12
Recondition/Replace the
silica gel
Auto II
2
Auto III
13
14
15
16
17
18
19
Replace oil in breather
IR value in mega ohms
HV to E
HV to LV
LV to E
Absorption Ratio
15sec/1mint
Polarization Index
10min/1min
OLTC Mech. Box
Clean contactors
Clean TPI switch
Oil level in gear box
Check oil level in the OLTC
conservator
Check oil leak in main tank,
radiators, conservator etc.,
Check cubical heaters and
thermostats in marshaling
box and OLTC mech.box
Check voltage of cooler
cubical source 1 & 2
Assistant Executive Engineer/Maintenance
3
TANTRANSCO
Quarterly Maintenance – with Shutdown activity
Quarterly Maintenance I / II / III / IV ………………
Sl.No Description of Activity
Date
1
Dielectric strength of oil
Main Tank bottom
Top
Conservator
OLTC chamber R ph.
Y ph.
B ph.
2
Checking of earth
connections
3
Checking of oil in OLTC
Gear box
4
Checking of operation of
OLTC step by step both
manual and motorized
5
Check MOG alarm
6
Check PRV trip
7
Check Horn Gap in
Bushings
Auto I
Auto II
4
Auto III
TANTRANSCO
Half Yearly Maintenance – with Shutdown activity
Half Yearly Maintenance
I / II
………………
Sl.No Description of Activity
Auto I
Date
1
Check fan and oil pump
operation
Apply grease for fan
bearings
Measure currents of fan
and pumps
2
Checking of earth
connections
3
Checking of oil in OLTC
Gear box
4
Checking of operation of
OLTC step by step both
manual and motorized
5
Check MOG alarm
6
Check PRV trip
7
Check Horn Gap in
Bushings
Auto II
5
Auto III
TANTRANSCO
Annual Maintenance – with Shutdown activity
Annual Maintenance …………………………
Sl.No. Description of Activity
Auto 1
Date
1.
Check foundation for
cracks etc.
2.
Check Rail stoppers.
3.
Check oil leaks in main
tank and conservator.
4.
Check oil leaks in
Radiator fins.
5.
Check oil leaks in
cooler pipe, pumps etc.
6.
Clean gauge glasses.
7.
Check MOG
operation.
8.
Check all Alarm
operations.
9.
Lubricates all fans and
pumps and check
operation.
Auto II
6
Auto III
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
Examine buchholz
relay for gas collection.
Check PRV operation
Check buchholz relay
operation.
IR Value HV to Earth
HV to LV
LV to Earth
Absorption co-efficient
60sec value/15sec value
Polarization Index
10 mins value/1 mins
value.
Over hauling of OLTC
Replace or re-condition
the oil
Greasing for OLTC
drive mech. Moving
parts
Check timer relay
settings and operation
Check for tightness for
electrical connection in
marshalling box,
OLTC mech. Box etc.,
Check leak in air cell
Checking contactors
7
22.
23.
24.
25.
26.
for their healthiness
replace if necessary
Calibrate winding and
oil temperature thermo
meters
Check fan and pump
currents and compare
with name plate detail
Check over load relay
setting
Check over load relay
operation
Thermal image
scanning
8
TANTRANSCO
AUTO/POWER TRANSFORMERS
Dissolved gas analysis test conducted in R&D lab for Auto/Power Transformers
Sl.No Description
1
Name of the
transformer
2
Voltage ratio
3
Maker’s Sl.No
4
6
Year of
manufacture
Date of
commission
Last oil filtration
7
Sample from
8
Date of sample
9
Date of test
5
I
II
9
III
Sl.No.
1.
2.
3.
4.
5.
6.
7.
8.
Characteristics
Dielectric strength
in KV
(IS 6792-1972)
Water content in
PPM(IS 2362-1973)
Resistively at
90oc in ohm-cm
IS (6103-1971)
Neutralization
value (Acidity)
Mgm.Koh/gm
Flash point (° C)
Interfacial Tension
(Dynes/cm)
Dielectric
dissipation
factor at 90°C
Sludge
Permissible
limit as per
IS
1866/1983
60KV (min)
Test Results
I
II
III
20PPM
(max)
0.1*10¹²
(min)
0.3(max)
125(min)
15.0(min)
1.0(max)
Present/not
Present
Dissolved Gas Analysis (values in ppm)
10
Sl.No. Name of the
gas
1
2
3
4
5
6
Hydrogen
Methane
Ethane
Ethylene
Acetylene
Carbon
dioxide
Permissible
limit as per
IEC605991999
<5
<2
<2
<2
<0.1
<200
Test value
Auto I
Auto II
TANTRANSCO
11
Auto III
_________MVA AUTO/POWER TRANSFORMER
Bushing tan delta test:
Make of measuring instrument:
Ambient temperature:
Date of test:
Mode of test: UST/GST
Bushing
230
KV
Make
Sl.No.
Capacitance
Pre.com
Meas.
C1
C2
C1
C2
Pre.com
Tan
δ1
Tan Delta
Meas.
Tan
Tan
δ2
δ1
Tan
δ2
R ph
Y ph
B ph
R ph
110 Y ph
KV B ph
Note: The Tan Delta value must be < 0.007 at 20°C
The rate of rise of Tan Delta per year = 0.001(max)
The rate of rise of capacitance per year =1%(max)
TANTRANSCO
12
________MVA AUTO/POWER TRANSFORMER
Winding tan delta test:
Make of measuring instrument:
Ambient temperature:
Date of test:
Sl.No
Description
1
2
3
4
5
6
7
8
CH +CHT
CH
CHT(UST)
CHT
CT + CHT
CT
CHT(UST)
CHT
Make
Specimen
Year of
Cap’ce (PF)
Manufacture
Corr.DF(%) Date of test
HV + HV to TER
HV to Earth
HV to TER (UST)
HV to TER(1 – 2)
TER to HV to TER
TER to Earth
HV to TER (UST)
HV to TER (5 – 6)
Note: The Tan Delta value must be < 0.007 at 20°C
The rate of rise of Tan Delta per year = 0.001(max)
The rate of rise of capacitance per year =1%(max)
TANTRANSCO
13
EHV SF6 CIRCUIT BREAKERS
Quarterly maintenance with shutdown activity
Quarterly Maintenance I / II / III / IV
Description
I
II
Date
Make
Sl.No.
Date of Commissioning
Cleaning of porcelain insulator
Check terminal clamps
Check earth connections
Check foundation bolt tightness
Check space heaters operation
FOR PNEUMATIC Mechanism
Check air compressor operation
Measure motor current
R phase
Y phase
B phase
Check oil level in compressor
Check oil quality in compressor
replace if necessary
Check ‘V’ belt tension
Check for air leak in check value
14
ID of the Circuit Breaker
III
IV
V
VI
Check for air leak in NRV
Check for air leak in safety value
Check for air leak in pipe lines
Check for air leak in operating
mechanism
Clean the air filter
Clean the breather
Clean motor cooling fin and
compressor cooling fins
FOR HYDRALIC Mechanism
Check motor operation
Check motor current
R phase
Y phase
B phase
Check oil level in the tank
Check for oil leak in pilot value
Check for oil leak in main value
Check for oil leak in pipe lines
FOR SPRING Mechanism
Check spring charging operation
Check spring charging time
Check IR Value
Incoming to Earth
R phase
Y phase
15
B phase
Outgoing to Earth
R phase
Y phase
B phase
Between contacts
R phase
Y phase
B phase
Check Breaker operation
Local mode
Remote mode
Assistant Executive Engineer
Maintenance
Assistant Engineer
Maintenance
TANTRANSCO
16
Annual maintenance with shutdown activity
Annual Maintenance
Functional check for air compressor / Hydraulic motor
I
II
III
IV
V
VI
Pre. Pres. Pre. Pres. Pre. Pres. Pre. Pres. Pre. Pres. Pre. Pres.
com value com value Com value com value com value com value
Description
Motor starts at (bar)
Motor stops at (bar)
Pressure drop for
Close
Trip
Close-Trip
Air/Hyd Pr. Low alarm at (bar)
Auto Re-closer lock out at (bar)
Close lock out at (bar)
Trip lock out at (bar)
Maintenance
Assistant Engineer
Maintenance
TANTRANSCO
17
Annual Maintenance
Description
Annual maintenance with shut down activity
Functional check for breaker timing
230 MNI
230 KPK
230 SPR
230 KBU
AT 1 HV
AT 2 HV
Pre. Pres. Pre. Pres. Pre. Pres. Pre. Pres. Pre. Pres. Pre. Pres.
com value com value com value com value com value com value
Closing time
R phase
Y phase
B phase
Closing coil current
R phase
Y phase
B phase
Tripping time (TC1)
R phase
Y phase
B phase
Tripping time (TC2)
R phase
Y phase
B phase
Tripping coil current (TC1)
R phase
Y phase
18
B phase
Tripping coil current (TC2)
R phase
Y phase
B phase
Check anti pumping
Maintenance
TANTRANSCO
19
Assistant Engineer
Maintenance
Annual Maintenance
Description
I
II
SF6 GAS density monitor setting
III
IV
V
VI
Rated pressure of SF6 at 20ºC in Bar
Present pressure in Bar
R phase
Y phase
B phase
Ambient temperature
SF6 Gas Low alarm at (bar)
R phase
Y phase
B phase
Lock out at (bar)
R phase
Y phase
B phase
Oil level in density monitor
Date of test
Maintenance
TANTRANSCO
20
Assistant Engineer
Maintenance
Annual Maintenance
Static Contact Resistance Measurement
Contact Resistance in micro ohms
R phase
B phase
C phase
ID of the Breaker
Pre. present
present
Pre.
Pre. present
Comm. value Comm. value Comm. value
value
value
value
Maintenance
TANTRANSCO
21
Assistant Engineer
Maintenance
HV SF6 and Vacuum CIRCUIT BREAKERS
Quarterly maintenance with shut down activity
Description
Pr.Trs. 1
LV
Pr.Trs. 2
LV
Date
Make
Sl.No.
Date of Commissioning
Check foundation bolt tightness
Check space heaters operation
FOR SPRING Mechanism
Check spring charging operation
Check spring charging time
Check IR Value
Incoming to Earth
R phase
Y phase
B phase
Outgoing to Earth
R phase
22
33 KV
33 KV
33 KV
PML
ICF OH
ICF UG
33 KV
JJ Nagar
Y phase
B phase
Between contacts
R phase
Y phase
B phase
Check Breaker operation
Local mode
Remote mode
Check SF6 gas leak
Maintenance
Assistant Engineer
Maintenance
TANTRANSCO
23
EHV CURRENT TRANSFORMERS
ID of the Current Transformer
Description
I
II
III
IV
Date
Check oil leak in top doom
Check oil leak in bottom tank
Check oil leak in secondary
terminal box
Check for cracks in insulators
Check healthiness of gaskets
Clean junction box
Check space heaters
Check all electrical connection of
secondary circuit
Maintenance
Assistant Engineer
Maintenance
TANTRANSCO
24
V
VI
EHV CURRENT TRANSFORMERS
Annual Maintenance with shut down activity
Annual Maintenance
Description
Phase
I
II
ID of the Current Transformers
III
IV
V
Date of test
Make
Sl.No.
Capacitance in
Tan delta
Check N2 gas pressure
R
Y
B
R
Y
B
R
Y
B
R
Y
B
R
Y
B
Maintenance
25
Assistant Engineer
Maintenance
VI
TANTRANSCO
EHV CAPACITIVE VOLTAGE TRANSFORMERS
Description
I
Date
Make
R phase
Sl.No.
Y phase
R phase
ID of the Capacitive Voltage Transformer
II
III
IV
V
Y phase
Check oil leak in top stake
Check oil leak in bottom stake and
EMU tank
terminal box
Check HF point
26
VI
Clean junction box
Check space heaters if available
secondary circuit
IR value
R phase
Y phase
Check Secondary
R phase
voltage in
marshaling
box
Y phase
Maintenance
Assistant Engineer
Maintenance
27
TANTRANSCO
EHV BUS POTENTIAL TRANSFORMERS
Annual Maintenance with shut down activity
Annual Maintenance
Description
I
ID of the Bus Potential Voltage Transformer
II
III
IV
V
Date
Make
R phase
Y phase
B phase
Sl.No.
R phase
Y phase
b phase
Check oil leak in top doom
Check oil leak in bottom tank
terminal box
Check bellow position
Clean junction box
28
VI
Check space heaters
secondary circuit
IR value
R phase
Y phase
B phase
Check Secondary
R phase
voltage in
Y phase
marshaling
B phase
box
Maintenance
Assistant Engineer
Maintenance
29
TANTRANSCO
EHV SURGE ARRESTERS
Annual Maintenance
Description
Phase
Auto 1
HV
Auto 2
HV
Date
Make
Sl.No.
R
Y
B
R
Y
B
Clean insulators
Check vent diaphragm
Check surge monitor
Check milli ammeter
Check and record counter
reading
R
Y
B
R
Y
B
R
Y
30
ID of the Surge Arresters
Auto 3
Auto 1
Auto 2
HV
LV
LV
Auto 3
LV
B
Check surge monitor
insulator for cracks
Clean earth pits
Measure IR value
R
Y
B
Maintenance
31
Assistant Engineer
Maintenance
TANTRANSCO
EHV CAPACITOR BANKS
Quarterly Maintenance I
Description
Date
Clean capacitor insulators
Check for oil leak in capacitors
Check jumper connection tightness
Check terminal connectors for tightness in
Reactors
Check terminal connectors for tightness in
Neutral CT
Check earth connection
Measure differential current and record
Bank I
Maintenance
32
Bank II
Assistant Engineer
Maintenance

TANTRANSCO

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