DistribuTECH/TransTECH Presentation

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Non-Contact/Invasive Sensor System for Real-time Transmission Line
Monitoring & Optimization
Πromethean ∆evices
9896 Charlotte Highway
Fort Mill, South Carolina 29707
803.802.7012
DOE Phase II SBIR Contract: DE-FG02-05ER84159
DOE Project Manager/Officer: Mr. Gil Bindewald
Wednesday, January 23rd, 2008
Mr. Steven J. Syracuse, President & Chief Technology Officer
Dr. Peter G. Halverson, Senior Scientist
Mr. Charles V. Barlow, Product Development Engineer
DistribuTECH/TransTECH 2008
Technology Description: RTTL-Monitoring System
High accuracy, purely electromagnetic, fully passive, real-time,
autonomous field sensor system.
Simultaneous determination, monitoring, and communication of HV
transmission conductor sag/clearance, phase current, ampacity,
and maximum conductor temperature.
Ground-based system designed to be far less expensive (in terms
of total installed/operational cost) than existing, commercial
transmission line monitoring and rating products.
Designed for rapid, simple, low-cost field deployment, installation,
and calibration.
Located in existing ROWs under overhead phase conductors.
RTTL-Monitoring System: Features and Advantages
Entirely non-contact/invasive configuration, deployment, installation,
calibration, and operation.
Fully secure (AES-encrypted) wireless, real-time communication of all
critical operating parameters.
High reliability/longevity, proven, off-the-shelf solar-battery power supply.
Designed for remote, autonomous, reliable field-and-forget operation.
Does not require specialized equipment and/or utility field crew
presence/participation/supervision for installation and/or calibration.
Does not require outages for installation, calibration, & maintenance.
Operation and Accuracy not adversely affected by rain, wind, fog, smoke,
hail, snow, ice, or any combination thereof.
Capable of direct burial and physically secure, subsurface operation.
Simplified RTTL-Monitoring System Field Arrangement
Phase A
Phase B
Phase C
Ruggedized, weatherproof
sensor enclosures
Transducers are located in enclosures under the nadirs of the 3
overhead phase conductor spans, A, B, and C, at, or just below,
ground level.
Pilot Test Site: Duke Energy Newport-Richmond 500 kV Tie
Duke Energy Newport-Richmond 500 kV Tie
Fort Mill, SC.
T62
T63
Simplified Cross-Sectional Layout: RTTL-Monitoring System
Phase B
Phase A
Phase C
Phase B Sensors
Phase A Sensors
Phase C Sensors
RTTL-Monitoring System Field Hardware 3/07:
Surface Deployment; Battery/Laptop-based Operation
Field Transducers Sub Phase A
(foreground), B, & C
Front End Analog and ADC
Electronics Package
Detail of Field Transducers
Located Sub Phase C
Laptop-based Data Acquisition, Signal Processing, Analysis,
Data Display, and Logging
RTTL-Monitoring System Detail: Laptop Field Display
Transducer Outputs: Voltage
Computed Phase Currents
Computed Conductor Clearance
Transducer Outputs: Phase
RTTL-Monitoring System Field Hardware 9/07:
Sub-surface deployment; fully autonomous operation
Field Transducer Direct
Burial Sub Phase B
System Field PC, Power
Supply, and Front End ADC
& Electronics Package
Detail of Transducer
Enclosure sub Phase C
Field PC-Based Data Acquisition, Signal Processing, Logging,
& Fully Secure, Encrypted, Wireless Communications
RTTL-Monitoring System in Place & Operating sub Newport-Richmond 500 kV Tie
RTTL-Monitoring System Performance (10/2007)
Phase Conductor Height/Clearance/Sag

Accuracy = 3 cm, or ~ 0.10%, @ ~ 18 m.
9 Design goal of 1% Accuracy

RTTL-Monitor - Laser Rangefinder clearance correlation = 99.3%
Phase Conductor Currents

System can discriminate and measure individual phase conductor
currents
Accuracy = 9 amps, or ~ 0.80%, @ ~ 830 A.
9 Design goal of 1% Accuracy

Duke Energy CT – RTTL-Monitor current correlations @ 99.93%
Phase Conductor Temperature

Developed Clearance vs. Max. Conductor Temperature Calibration
¾ R2 > 99.1% for 34 field measurements taken through 9 04 2007
¾ Based on analysis of HR IR images, each capturing 4 m of OH conductor.
¾ Accuracy (preliminary) = ± 3.5 C
¾ Design goal of ± 2 C. Accuracy
System Performance: Phase Conductor Clearance
18.50
Overhead Phase Conductor Clearance:
RTTL-Monitor and Laser Rangefinder Raw Data
18.40
Field Test of September 7th, 2007
500 kV path; 1 pt./5 sec. over 10 hrs.
18.30
18.20
Meters
18.10
18.00
17.90
17.80
17.70
17.60
RTTL-Monitor Clearance
Laser Rangefinder Clearance
17.50
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Elapsed Run Time (Hours)
7.0
8.0
9.0
10.0
System Performance: Phase Conductor Clearance
18.50
Overhead Phase Conductor Clearance:
RTTL-Monitor and Laser Rangefinder Data
18.40
500 kV path; 1 pt./5 sec. over 10 hrs .
18.30
18.20
SUMMARY OF SYSTEM PERFORMANCE:
Meters
18.10
Standard Error =
2.6 cm
RMS Error =
2.0 cm
Average Absolute Error = 2.2 cm
Average Clearance =
17.88 m
Average % Error (Abs.) = .12 %
18.00
17.90
2
R = .9931; n = 7158
17.80
17.70
17.60
RTTL-Monitor Clearance (5 min.)
Laser Rangefinder Clearance (5 min)
17.50
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
System Performance: Phase Conductor Current
1200
1150
Average Overhead Phase Current Comparison:
RTTL-Monitor and Utility CT Raw Data
1100
1050
1000
950
900
Amperes
850
800
750
700
SUMMARY OF SYSTEM PERFORMANCE:
650
600
550
500
PD TL-Monitor Average Phase Current
450
Average Phase Current (Utility CTs)
Standard Error =
6.4 Amps
RMS Error =
8.4 Amps
Average Absolute Error = 6.7 Amps
Average Phase Current = 830 Amps
Average % Error (Abs.) = .8 %
2
R = .9993; n = 7219
400
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
System Performance: Phase Conductor Temperature
55.0
18.50
Phase Conductor Temperature and Clearance:
RTTL-Monitor Data
52.5
50.0
18.40
47.5
18.30
45.0
18.20
40.0
18.10
37.5
35.0
18.00
32.5
17.90
30.0
27.5
17.80
25.0
17.70
22.5
20.0
17.60
Max Conductor Temperature (5 min.)
17.5
RTTL-Monitor Clearance (5 min.)
15.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
17.50
10.0
Meters
Maximum Temperature ( C.)
42.5
RTTL-Monitoring System: Long Term Field Performance
Transducer
Outputs
(Volts)
Computed
Phase
Currents
(Amps)
Computed
Conductor
Height/
Clearance
Recent System Research
Phase Angles based on Phase Current Waveform Processing

Monitor absolute current vector phase angles
System determines the absolute and relative phase angles to .1 degrees
Clear discrimination of three individual phase conductors
Can resolve phase angles to .01 degrees
Frequency based on Phase Current Waveform Processing

Added frequency tracking based on phase current waveforms
¾
¾
¾
¾
¾
System determines the relative frequency to .01 Hz
Clear discrimination of three individual phase conductors
Can resolve 1 mHz, or better
Currently referenced to internal System Clock
Needs to be referenced to GPS time/frequency Standard
Present Efforts & Near-Term Goals: 10/07 – 8/08
Conduct Long-Term, Unattended, Self-Powered, RTTL-Monitoring
9
9
9
Transition from Laptop to Solar/Low-Power Field PC Platform (7/2007)
Underground system and secure PC/Electronics/Power Supply on-site (7/2007)
Long term testing commenced 10/2007
Implement Secure Web Interface to Enable RT Reporting to End-Users
9
¾
¾
Implement Fully-Wireless Command, Control, and Communications (10/07)
Develop and deploy secure web-display; add Sag to display (11/07)
Develop and deploy secure End-User interface (12/07)
Complete Ampacity Algorithm Development, Implement, and Test/Validate
9
¾
¾
¾
Complete instantaneous Ampacity algorithm (11/07)
Develop predictive Ampacity Algorithms: 15 m; 30 m; 45 m; Emergency
Implement in Secure End-User Web Interface (12/07 – 1/08)
Test against IEEE 738, the CIGRE Standard, and SAG10 (1/08 – 4/08)
Conduct Long-Term Validation of Sag/Clearance, Phase Current, and Temperature
Accuracy
¾
Test/Validate against IEEE 738, the CIGRE Standard, and SAG10 (1/08 – 4/08)
System Performance Improvements:
¾
¾
¾
Improve Conductor Temperature Accuracy to ± 2° C. (2/08 – 4/08)
Develop RT Dynamic Rating Algorithms: Instantaneous; 15 m; 30 m; 45 m; Emergency
Develop cumulative time at temperature and time at sag/clearance histograms
Determination & Long-Term Validation of Resolution & Precision of
Sag/Clearance, Phase Current, and Maximum Conductor Temperature
Non-Contact/Invasive Sensor System for Real-time Transmission Line
Monitoring & Optimization
Πromethean ∆evices
9896 Charlotte Highway
Fort Mill, South Carolina 29707
803.802.7012
DOE Phase II SBIR Contract: DE-FG02-05ER84159
DOE Project Manager/Officer: Mr. Gil Bindewald
Wednesday, January 23rd, 2008
Mr. Steven J. Syracuse, President & Chief Technology Officer
Dr. Peter G. Halverson, Senior Scientist
Mr. Charles V. Barlow, Product Development Engineer

DistribuTECH/TransTECH Presentation

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