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Tashia Marie Anthony
TNB Research Sdn. Bhd.
4th September 2019
TNB Customer Innovation
Medium Voltage Cable Diagnostic
Services
2 Copyright © 2019 TNB Research
TNB Research Sdn. Bhd.
A wholly owned subsidiary of TNB since 1993
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To be A Premier R&D organization for the Energy Industry Globally
TNB Research Sdn. Bhd.
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Generation, Environment, RE & Green Technology
We Deliver
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Power Delivery & Smart Grid
We Deliver
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Focusing on Distribution Network Assets
Asset Performance
Asset Performance Unit
Power Cable & Accessories
Medium & Low Voltage Overheads Lines
Street lighting
Power Metering
Distribution Network
Power Quality & Losses
POWER
GENERATION
Hydro Station
Thermal
Station
Emissions Efficiency
DISTRIBUTION
NETWORK
TRANSMISSION
NETWORK INDUSTRIAL
COMMERCIAL RESIDENTIAL
Substation Substation
Underground Cables
Overhead
Lines
Cable Joints
National Grid
Control Centre
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Cable Diagnostic Test
Partial Discharge (PD)
Tangent Delta
It is critically important to assess the level of performance of insulation using diagnostic testing
Power Cable & Accessories
Manufacturing Imperfections
Poor Workmanship
Overheating
Mechanical
Wet Environment
Water ingress
Typical Cable Joint Defects
Typical Power Cable Defects Source: Diagnostic Testing of Underground Cable Systems, NEETRAC, Dec 2010 Typical Cable Design
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Conventional Offline Partial Discharge Mapping using Oscillating Wave Test System (OWTS)
Partial Discharge Test
• Requires shutdown • Test conducted above
operational voltage • Partial discharge
severity and cable health index can be calculated
OWTS PD Mapping Results
OWTS PD Mapping Equipment
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TNBR started developing Online PD Mapping System since 2008
TNB PD Online Mapping System
• No shutdown required
• PD activities can be measured continuously for longer periods of time or even permanently
• Able to map defect section in MVUG cable due to PD activities
• Partial discharge severity and cable health index can be calculated
High Frequency
Current Transformer
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• High Frequency Current Transformer (HFCT) for acquisition of PD Data.
• Signal Analysis Module (SAM) with GPS for timing synchronization, GPRS (sim card) interface for communication with base station.
• Cloud for data storage.
• Base station consist of server for PD mapping result analysis & processing.
TNB Online PD Mapping System hardware components.
TNB PD Online Mapping System
HFCT installation at cable earth GPS antenna transmitter
Signal Analysis Module PCB Board Signal Analysis Module
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TNB Online PD Mapping System software components.
TNB PD Online Mapping System
• Very High Speed Integrated Circuit Hardware Description Language (VHDL) and C language for Signal Analysis Module.
• The software record the data (with time stamping) in a buffer and transmit the data packet (every 30 minutes) to the base station for processing.
• Microsoft Visual C++ for base station.
• It used for analyze and process PD data for time stamping and mapping of PD activities the tested circuit in real-time.
Base Station at TNBR
Real-time PD Mapping Result
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• Verification of TNB Online PD Mapping system was conducted based on Offline OWTS test result.
• Test results shows various condition of PD activities in the circuits tested such as PD at termination, multiple PD activities, scattered PD and no PD activities.
• It can be concluded that accuracy of TNB Online PD Mapping detection rate is at 80% as compared to Offline OWTS PD Mapping System.
Circuit No
Offline OWTS
Location (Automated processing)
Online PD Location
C1 150m Scattered PD
C2 700m Scattered PD
C3 Termination Termination
C4 100m, 560m & 760m
100m, 560m & 760m
C5 50m
Termination and 50m
C6 270m & 320m
270m & 320m
C7 Termination
Termination and 70m
C8 Scattered PD Scattered PD
C9 Scattered PD Scattered PD
C10 195m, 420m & 510m
195m, 420m & 510m
TNB Online PD Mapping System was verified with Offline OWTS PD Mapping at 10 different sites
TNB PD Online Mapping System
C3 Offline PD Mapping Result
C3 Online PD Mapping Result
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13 Copyright © 2019 TNB Research
• Severity index algorithm has been developed to determine cable condition based on TNB Online PD Mapping test.
• The algorithm need to be compared with existing Offline PD Mapping result to determine effectiveness of proposed recommendation and action.
• More data needs to be collected to strengthen the TNB Online PD Mapping severity level index.
Circuit Location Severity Index
C3 0,
Termination 7.9
C4 100 1.6
C4 560 13.6
C4 760 1.1
C5 0,
Termination 2.6
C5 50 3.2
C6 270 2.6
C6 320 1.7
C7 0,
Termination 4.6
C7 70 1.8
C10 195 1.2
C10 420 2.0
C10 510 7.6
Severity Level
Action
Severity < 2 Normal. The monitoring periodicity of all tests can be maintained at 24 months. Practice partial discharge test if necessary.
2 < Severity < 5
Retest the cable for partial discharge after 6 months. The monitoring periodicity of all tests should be revised to 6 months.
5 < Severity < 7
Retest the cable for partial discharge after 3 months. Arrange for replacement of defective section(s).
Severity > 7 Indicates serious problem requiring immediate evaluation, additional testing and consultation with experts. Recommendation is to remove from service immediately and replace the cable.
Severity index algorithm developed requires more data to determine the effectiveness of proposed recommendation
TNB PD Online Mapping System
Severity Index for PD Online Mapping Test
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TNBR offers Medium Voltage Cable Diagnostic Services
Way Forward
Medium Voltage Cable Diagnostic Services
1. Offline Partial Discharge Mapping
2. Online Partial Discharge Mapping
3. Online Partial Discharge Monitoring & Scanning
4. Tangent Delta Test
5. Pilot Cable Fault Mapping
6. Cable Ampacity Simulation Analysis
We welcome partnership & collaboration
TNB RESEARCH SDN. BHD. No. 1, Lorong Ayer Hitam Kawasan Institusi Penyelidikan 43000 Kajang, Selangor MALAYSIA
www.tnbr.com.my / www.tnblabs.com.my
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Disclaimer. All information contained herein are solely for
the purpose of this presentation only and cannot be used or
referred to by any party for other purposes without prior
written consent from TNB. Information contained herein is
the property of TNB and it is protected and confidential
information. TNB has exclusive copyright over this
information and it is prohibited to disseminate, distribute,
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