prague, 8-11 june 2009 - cired · 2018-09-10 · prague, 8-11 june 2009 1. introduction 2. surge...
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Prague, 8-11 June 2009
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Prague, 8-11 June 2009
1. Introduction2. Surge Arrester Failures in TNB Distribution3. Diagnostic Assessment Plan for Surge Arrester4. On-Line Diagnostic Methods for Surge Arrester5. TNB Experience6. Conclusion
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Outline of Presentation
Prague, 8-11 June 2009
Malaysia Isokeraunic Level –200 Thunder Days/Year
Lightning An Issue In Malaysia
Affects Reliability of MV Bare Overhead Line System
Conductor Having Highest Failure Rate
10/94
Lightning in Malaysia
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Prague, 8-11 June 2009
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Lightning in Malaysia
10Mean kA (+)
77Max kA(+)
4Min kA (+)
23Mean kA (-)
295Max kA(-)
4Min kA (-)
172.29Expfactor
21Mean kA
295Max kA
4Min kA
8.20524Density
15.9% Positive
1828Count (+)
9681Count (-)
11509Count Ground Stroke Density Statistics for Malaysia in 2007
Dominated by Negative Stroke
Min = 4 kAMax = 295 kAMean = 21kA
Prague, 8-11 June 2009
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Lightning in MalaysiaMV Overhead Lines Failures Cause by Lightning
Typical Major Causes for MVOH System Breakdown in TNB
3%6%
9%
10%
11%
27%
34%
TRANSIENTLIGHTNINGAGEINGTREESANIMALSPOOR CONTACTTHUNDERSTORM
Prague, 8-11 June 2009
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Lightning in MalaysiaTypical 33kV Surge Arrester Used in TNB Distribution
131kV96kV58kVMaximum Residual Voltage @ In09
168kV
24kV
NER/PC
125kV
24kV
22kV
22kV
Class 1
125A @ 2000μsec
100kA
98kV
10kA
9.6kV
NER
21kA
75kV
50Hz
12kV
11kV
11kV
Line Discharge Class13
Long Duration Current Impulse12
High Current Impulse11
221kVHousing Lightning Impulse Withstand10
Nominal Discharge Current (In)08
29kVMax. Cont. Op. Voltage (MCOV)07
NEREarthing System06
Prospective Short-Circuit Current05
170kVLightning Impulse Withstand Level 04
Frequency03
36kVMaximum Voltage02
33kVNominal Voltage01
33kVMandatory SpecificationNo.
Prague, 8-11 June 2009
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
S/A Failures in TNB DistributionSurge Arrester Failure Statistics
Typical Root Cause to Surge Arrester Failure in TNB Based on Frequency
6%
6%
6%
19% 63%
LightningAgeingProtection MaloperationAnimalOthers
Prague, 8-11 June 2009
• Disconnector Expulsed & Dislodged from Damaged S/A Ensuring Disconnection from Healthy System
• Failed Disconnector Tail Causes Transient Tripping as Current Flows Through to Ground
• Detecting Failed S/A Becomes a Challenge
• Undetected Failed S/A a Liability to Asset
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
S/A Failures in TNB DistributionSurge Arrester Disconnector Tail Failure
Prague, 8-11 June 2009
• Due to Moisture Ingress ~ Corrosion at Disconnector Tail ⇒ Inability to Dislodge
• Use of PVC Disconnector Tail ~ PVC Hardened ⇒Only Partial Disconnection
Failed Disconnector
Tail
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
S/A Failures in TNB DistributionSurge Arrester Disconnector Tail Failure
Prague, 8-11 June 2009
• Exposure to Moisture Leakage through End Fitting
• Usually Related to Wrapped or Slip-in Design – Earlier Technology
• Revision of Technical Specification ~ Use of Polymeric Direct Mould Design to Avoid Voids between Polymeric Housing & Active Parts
• Engineering Practice Update ~ Use of Flexible Copper Braid Instead of PVC Insulated Jumpers
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
S/A Failures in TNB DistributionMoisture Leakage & Contamination
Prague, 8-11 June 2009
Silicone Housing
MO Varistor
Fiber Glass WrappingImpregnated with
Epoxy Resin
Wrap Design with Epoxy Resin
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
S/A Failures in TNB DistributionMoisture Leakage & Contamination
Direct Mould Design
MO Varistors
Direct Moulded SiliconeOn MO Varistor
Fiber Glass Loop
Prague, 8-11 June 2009
• Higher Requirement for Nominal Discharge Current, Line Discharge Class & BIL for Highly Prone Lightning Areas
• Lightning in Malaysia Mean = 20kA
• Thermal Capabilities to Allow Shorter Cool Down Time to 60 °C
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
S/A Failures in TNB DistributionExcessive Magnitude & Duration of Lightning Surge
Prague, 8-11 June 2009
• Considered EOL After 25 to 30 Successful Full Rated Discharge (10 kA) + Numerous Lower Discharge Rating
• Manufacturer’s Recommendation = 15 to 30 Years Depending on Usage
• Which One’s More Accurate?
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Surge Arrester Diagnostic PlanSurge Arrester End of Life
Prague, 8-11 June 2009
Consider the Following Ageing Factors:
• Chronological Age
• Cumulative Service Stress
• Abnormal Event Stress
• Technical Obsolescence
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Surge Arrester Diagnostic PlanSurge Arrester End of Life
Prague, 8-11 June 2009
• Impulse Frequency Flashover Voltage Test• Power Frequency Sparkover Voltage Test• Leakage Current Detection Method• Insulation Resistance Test• Infrared Thermography• Partial Discharge Method (New)
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Surge Arrester Diagnostic PlanSuggested Tests & Diagnostic Tools
Prague, 8-11 June 2009
• Leakage Current Detection• Infrared Thermography• Partial Discharge
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Surge Arrester Diagnostic PlanOn-Line Diagnostic Tools - Preferred
Prague, 8-11 June 2009
• Damaged Surge Arrester Loses Characteristic as Insulator at Power Frequency Voltage
• Presence of Leakage Current > 1 mA for Typical MOV Gapless Surge Arrester
• Develop into Earth Fault
• Causing Transient Tripping
• Measurement of High Leakage Current on Bare S/A Down Lead Raises Safety IssuesMohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
On-Line DiagnosticsLeakage Current Detection Method
Prague, 8-11 June 2009
• Moisture Ingress Reduces Resistance of S/A• Failed S/A Allows Higher Leakage Current• Heating of S/A• Higher Temperature between 10°C to 20°C Compared
to Healthy S/A
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
On-Line DiagnosticsInfra Red Thermography
Prague, 8-11 June 2009
CESI Recommended Thermographic Severity Level
Severity Level
Overheating Range Action Required Time Frame
4 > 35°C Immediate 0
3 10°C - 35°C Short Interval 1 – 2 wks
2 5°C - 9°C Medium Interval 4 – 8 wks
1 2°C - 4°C Notification 24 wks
0 < 1°C No Action 48 wks
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
On-Line DiagnosticsInfra Red Thermography
Prague, 8-11 June 2009
• Used for Insulation Integrity
• Determine Health of MOV Blocks
• Utilizes Contact Method Using Ultra Wide Band Radio Frequency to Detect Noise Level Produced by Partial Discharge within MOVMohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
On-Line DiagnosticsPartial Discharge Method
Prague, 8-11 June 2009
Partial Discharge Method
dB Intensity Correlation to PD Severity LevelSeverity
LevelPD Activity
LevelAction
RequiredTime Frame
(Month) dB Level
1 Nil Nil 12 – 18 < 332 Moderate Retest 12 34 – 403 Medium Repair / Replace 6 41 – 47
4 Medium High Repair / Replace 3 48 – 52
5 High Repair / Replace 1 53 – 59
6 Very High Stop Operation / Replace Immediate > 60
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
On-Line Diagnostics
Prague, 8-11 June 2009
Infrared Thermography in TNB Distribution
• Mainly for Transformers & Switchgears• Also for Loose Contact on Overhead Lines• Seldom Used on S/A ~ Passive & Static• CESI Recommends Hot Spot Detection for:
• Conductors• Supports• Bases• Dead End Tension• Suspension Clamps
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
TNB Distribution Experience
Prague, 8-11 June 2009
Partial Discharge Field Trial in TNB Distribution
• Field Trial Done in Perak, Selangor, Pahang• Perak Location
• 33kV MFM – Damai Laut Line• 33kV MFM – Pantai Remis Line• 33kV Pantai Remis – Trong Line• 22kV Overhead Lines in Bidor
• High Level of Uncertainty• All Measured S/A Healthy
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
TNB Distribution Experience
Prague, 8-11 June 2009
Partial Discharge Field Trial in TNB Distribution
• Pahang Location• 33kV Tg Batu – Rompin Line• 33kV Rompin – Tg Gemuk Line• 33kV Jengka – Lepar Utara Line• 33kV Muadzam Shah – Selancar Line• 33kV Jerantut – Kuala Tahan Line• 33kV PPU Cini Distribution Substation
• High Level of Uncertainty• Mostly Measured S/A Healthy
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
TNB Distribution Experience
Prague, 8-11 June 2009
Location Position R Y BJRNT-HTLG 001 Incoming 25.6 dB 22.3 dB 17.1 dB
JRNT-HTLG 001 Outgoing 22.0 dB 16.0 dB 23.0 dB
JRNT-HTLG 217 Incoming 17.0 dB 25.7 dB 18.5 dB
JRNT-HTLG 246 Incoming 17.3 dB 16.4 dB 20.2 dB
JRNT-HTLG 248 Incoming 17.5 dB 20.2 dB 28.3 dB
JRNT-HTLG 248 Outgoing 25.6 dB 58.3 dB 22.6 dB
JRNT-HTLG 264 Incoming 31.7 dB 35.6 dB 26.5 dB
JRNT-HTLG 264 Outgoing 25.6 dB 38.5 dB 17.5 dB
BMS-SEL 001* Outgoing 26.3 dB 27.3 dB 26.7 dB
BMS-SEL 128 Incoming 08.0 dB 12.0 dB 16.7 dB
BMS-SEL 133 Incoming 10.4 dB 13.3 dB 10.2 dB
BMS-SEL 133 AR Incoming 15.5 dB 12.6 dB 11.6 dB
BMS-SEL 133 AR Outgoing 07.5 dB 08.2 dB 10.4 dB
BMS-SEL 196* Incoming 23.0 dB 34.4 dB 14.6 dB
BMS-SEL 199 AR Incoming 12.3 dB 12.6 dB 12.0 dB
BMS-SEL 199 AR Outgoing 22.0 dB 16.3 dB 20.0 dB
JENG-FLU 001 Incoming 09.2 dB 08.7 dB 10.0 dB
JENG-FLU 001 Outgoing 10.2 dB 14.1 dB 14.1 dB
JENG-FLU 002* Incoming 11.0 dB 04.7 dB 10.8 dB
JENG-FLU 004* Incoming 14.0 dB 11.8 dB 16.7 dB
JENG-FLU 054 Incoming 09.6 dB 13.3 dB 13.5 dB
JENG-FLU 181 Incoming 27.5 dB 27.1 dB 38.8 dB
JENG-FLU 199 Incoming 24.4 dB 26.9 dB 29.2 dB
JENG-FLU PPU Incoming 26.7 dB 10.6 dB 11.6 dB
Location Position R Y BC-CT 001 PPU C Incoming 13.5 dB 17.7 dB 12.7 dB
C-CT 002 Incoming 19.8 dB 56.3 dB 57.9 dB
C-CT 002 Outgoing 24.0 dB 21.3 dB 17.3 dB
C-CT 059 Incoming 19.2 dB 23.4 dB 12.2 dB
PPU CT AR Incoming 16.1 dB 21.0 dB 20.4 dB
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
TNB Distribution ExperiencePartial Discharge Field Trial in TNB Distribution
Prague, 8-11 June 2009
Partial Discharge Field Trial in TNB DistributionTB-KR 001 Incoming 02.5 dB 02.5 dB 01.0 dB
TB-KR 028 Incoming 03.1 dB 34.0 dB 06.9 dB
TB-KR 041 Incoming 04.0 dB 04.0 dB 01.0 dB
TB-KR 110 Incoming 40.0 dB 17.1 dB 17.7 dB
TB-KR 131-01 Incoming 05.1 dB 00.2 dB 26.7 dB
TB-KR 131-10* Incoming 03.1 dB 10.4 dB 05.1 dB
TB-KR 148 Incoming 15.9 dB 18.5 dB 14.1 dB
TB-KR 180 Incoming 23.2 dB 28.3 dB 29.7 dB
TB-KR 216 Incoming 20.4 dB 24.2 dB 22.8 dB
TB-KR 231 Incoming 11.4 dB 13.1 dB 07.8 dB
TB-KR 267 Incoming 22.8 dB 26.1 dB 18.7 dB
TB-KR 275 Incoming 26.2 dB 23.8 dB 24.4 dB
TB-KR 306 Incoming 32.4 dB 24.2 dB 24.4 dB
TB-KR 357 Incoming 24.6 dB 21.3 dB 26.6 dB
TB-KR 362 Incoming 21.0 dB 21.1 dB 26.1 dB
TJBU-SGCG 01 Incoming 06.3 dB 02.9 dB 02.5 dB
TJBU-SGCG 22/1 Incoming 02.9 dB 01.0 dB 02.9 dB
TJBU-SGCG 27/1 Incoming 10.6 dB 04.9 dB 14.1 dB
TJBU-SGCG 27/3 Incoming 10.2 dB 13.3 dB 13.5 dB
TJBU-SGCG 27/4 Incoming 06.3 dB 03.5 dB 11.6 dB
RMPN-TGCK 013 Incoming 23.6 dB 24.9 dB 20.8 dB
RMPN-TGCK 081 Incoming 27.3 dB 32.0 dB 27.5 dB
RMPN-TGCK 081 Outgoing 0.98 dB 07.2 dB 21.6 dB
RMPN-TGCK 133 Incoming 23.1 dB 18.0 dB 11.6 dB
RMPN-TGCK 169 Incoming 0.96 dB 0.96 dB 0.96 dB
RMPN-TGCK 181 Incoming 10.4 dB 25.1 dB 39.1 dB
RMPN-TGCK 181 Outgoing 24.2 dB 25.3 dB 22.6 dB
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
TNB Distribution Experience
Prague, 8-11 June 2009
• Interpretation of Results from TNB Pahang• 159/168 Measured as Healthy S/A• 6/168 having Moderate PD – 12 months• 3/68 having Medium High PD – 3 months
•PD Testing on S/A New ~ Hi-Uncertainty Level• But ~ Better Control for Replacement Strategy• Provide Tangible Reliability Status of OHL• Allow Better Budget Prioritization
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
TNB Distribution ExperiencePartial Discharge Field Trial in TNB Distribution
Prague, 8-11 June 2009
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
TNB Distribution ExperienceInsulation Resistance Test on Faulty Surge Arrester
SA 04
SA 03
SA 02
SA 01
Arrester Specimen
1704
1873
3482
1851
Impedance (GΩ)No.
Source: TNB Research
Prague, 8-11 June 2009
1. Low Confidence Level as PD Measurement for Surge Arrester is New
2. Question in Accuracy of PD Measurement ~ Comparative Study with IR Thermography & Leakage Current Necessary
3. Off-Line & Lab Testing Unable to Confirm Surge Arrester Failure
4. Diagnostic Tools Giving Tangible Measurement Gives Educated Guess on Surge Arrester Health
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Conclusion
Prague, 8-11 June 2009
5. Allows Techno-Economic Planning i.e. Replacement & Retirement Strategy & Budgeting Priority
6. Gives Opportunity for Structured Condition Monitoring Basis and End-of-Life Evaluation for Surge Arrester
Mohd Faris Ariffin – TNB Malaysia Session 1 Paper ID 0674
Conclusion
Prague, 8-11 June 2009
Contacts:[email protected]
Ir. Mohd Faris AriffinEngineering Dept., Distribution Division,TNB
Level 11, Wisma TNBNo. 19, Jln Timur
46200 Petaling Jaya, Selangor, MALAYSIA
Tel: +603-79679183 Fax: +603-79572895
94/94