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The Impact of Voltage Sag for PEA Area 1(North) Customers in North Industrial Estate

PQSynergy TM 2011 Chiangmai. The Impact of Voltage Sag for PEA Area 1(North) Customers in North Industrial Estate. Suwipha Kittitanapisarn . B .Eng (EE ) Assist. Chief of Power Quality Section PEA Area1 (North) Chiang Mai, THAILAND suwipai@yahoo.com. PEA Area1 (North) In Overview.

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The Impact of Voltage Sag for PEA Area 1(North) Customers in North Industrial Estate

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  1. PQSynergyTM2011 Chiangmai The Impact of Voltage Sag for PEA Area 1(North) Customers in North Industrial Estate SuwiphaKittitanapisarn. B.Eng(EE) Assist. Chief of Power Quality Section PEA Area1 (North) Chiang Mai, THAILANDsuwipai@yahoo.com Provincial Electricity Authority, Thailand

  2. PEA Area1 (North) In Overview • The Service Area of PEA Area1(North)is approx. 69,557 km2 , accounting for 13.64 % of the country. • 6 Provinces • 80 amphors • 592 districts • 6,611 villages • 4,734,252 populations • 1,534,755 customers Provincial Electricity Authority, Thailand

  3. 41 Substations in Responsibility of PEA Area1 (North) (278 Feeders) PEA Substation 115/22kV PEA Substation 22kV MEA PEA Switching Substation115kV CSA MCA CKN Transmission Line 115 kV PEA THG MCN EGAT Substation TNG FAA CR Customer115 kV CRA S S S S S S S CUN MLA CDO WPA PAU PYA MHA • PEA Substation 22kV MRM MTG PAN MTA DKA CHM CMB Total 14 Substations CMD CMF CMA SKP Cement Thai Lampang Public Co.,Ltd. LPC CME CMC LNB S LP-2 • PEA Substation 115/22 kV LPB HCA LNA LP-1 Total 27 Substations CEA NIU LPA NIA CTG PAS • PEA Switching Substation 115kV LNC BGA HOA Total 2 Substations LIA TEA

  4. The Comparison of Peak Load Year 2011 and 2010 MW 1,039.12 991.33 995.73 Higher than = 4.86% Lower than = 3.92% Lower than = 4.38% Higher than = 7.83% Lower than = 4.85% Higher than= 12.5% Higher than 4.55% Jan Feb Mar Apr May June Jul Aug Sep Oct Nov Dec Year 2010 Year 2011

  5. Lamphun Province In Brief 8 Amphors 8 Substations Power Transformer Capacity 490MVA Total Load 175.2 MW UF. 40.87 %

  6. Transmission Loop Line Project in Chiangmai Area MRM MRM Now Open Looped DKA Peak Load 300 MW 1,630 A CMD CMD CMF CMF CME CME SKP SKP LNC,NIA,NIU, LNC,NIA,NIU, CMC CMC

  7. Introduction North Industrial Estate NIU Substation North Industrial Estate Lot2 North Industrial Estate Lot1 NIA Substation 3 Substations Power Transformer Capacity 240 MVA Total Load 101.7 MW UF. 48.42 % 8 Amphors 8 Substations Power Transformer Capacity 490MVA Total Load 175.2 MW UF. 40.87 % LNC Substation SahapatIndustrial Estate 115kV CMC- LNC

  8. Report of Average SAIFI Indices (Accumulated from Jan-June 2011)Compare with Target (Level3) in Year 2011 Lower than 21.47% Times per customerper year Industrial Estate CityMuniciple DistrictMuniciple SubDistricttMuniciple ResidentalArea Total SAIFI Year 2011 Target Year 2011

  9. Report of Average SAIDI Indices (Accumulated from Jan-June 2011)Compare with Target (Level3) in Year 2011 Lower than27.35% Minutesper customerper year Industrial Estate CityMuniciple SubdistrictMuniciple ResidentalArea Total DistrictMuniciple Target Year 2011 SAIDI Year 2011

  10. Voltage Sag (IEEE Std.1159-1995) To Industrial Customers, a Voltage Sag and Momentary Interruption are equivalent if both shut their process down

  11. Fault in Transmission and Distribution Line While the Fault is in the Transmission System, the Entire Power System, including the Distribution System will experience Voltage Sag and Fault are cleared 3-6 cycles for Fault Detection and Breaker Operation 22 kV 115kV 22 kV/400 V2500 KVA DYn11 Severity of Voltage Sagdepend on - Fault Location - Fault Sizing - Fault Type and Clearing Time of Protection Equipment Provincial Electricity Authority, Thailand

  12. Study of Voltage Sag Analysis in North Industrial Estate Process of Voltage Sag Prediction 1.To Correctly Prepare Single Line Diagram of North Industrial Estate Area from PEA-GIS Phase2 Web Database2.Performing Short-Circuit Simulations with Sliding Faults which include Line to Line, Line to Ground and Three Phase Faults in Digsilent 14.0 Simulation Program.3.Calcutaion Magnitude of Voltage Sag at Interesting Load4.Predict Voltage Sag Duration Time by Characteristic of Clearing Fault of Protection Equipment5.Compare Characteristic of Voltage Sag for Determine the Need for Power Conditioning Equipment at Sensitive Loads in Customer Area Provincial Electricity Authority, Thailand

  13. Theory of Voltage Sag Analysis V sag = Z 2 + Z f Impedance Divider Z 1 + Z 2 + Z f Provincial Electricity Authority, Thailand

  14. Transmission Line from CMC to LNC 14 Provincial Electricity Authority, Thailand

  15. Process to Voltage Sag Analysis 1.Prepare Single Line Diagram from PEA-GIS Phase 2 Web Database Provincial Electricity Authority, Thailand

  16. GIS Phase 2 Provincial Electricity Authority, Thailand

  17. Export Single Line Diagram from GIS Phase 2 as *dz files 17 Provincial Electricity Authority, Thailand

  18. 3.Merge *.dz Files in Digsilent Power Factory Version 14.0 and start to run Sliding Fault Calculation 18 Provincial Electricity Authority, Thailand

  19. Voltage Sag from Transmission Fault *OPTREX is a Customer in North Industrial Estate Lot1 Provincial Electricity Authority, Thailand

  20. (Continued) Voltage Sag from Transmission Fault Provincial Electricity Authority, Thailand

  21. Description Voltage Sag from Distribution Fault 21 Provincial Electricity Authority, Thailand

  22. 4. The Result For Fault at NIU02 ,5 km. From NIU Substation 3P-Fault=3.63 kA,distance =5km. V=0 pu. 0.14 pu. For Parallel Feeder (NIU01,03,05 = 0.49 pu.) S Drissen 0.43 pu. 0.46 pu. 22 Provincial Electricity Authority, Thailand

  23. Voltage Sag Summary from Distribution Fault 23 Provincial Electricity Authority, Thailand

  24. (Continued)Voltage Sag Summary from Distribution Fault Provincial Electricity Authority, Thailand

  25. Voltage Sag Occurrence Calculation Summary from Transmission and Distribution Fault Provincial Electricity Authority, Thailand

  26. Voltage Sag Occurrence Calculation Summary from Transmission and Distribution Fault 26 Provincial Electricity Authority, Thailand

  27. How Often for Customers to Meet Voltage Sag? How Often for Sag 40% at DrissenCo.,Ltd.(NIU02) In 8 Months?DrissenCo.,Ltd. Meet Sag 40% = Uniform Fault Rate x Distance from NIU-Drissen = 0.17 (Faults/km-year) x 1 km. = 0.17 sags / 8 Months 27 Provincial Electricity Authority, Thailand

  28. Installation Dranetz-BMI PX5-400 POWER Analyzer 1.At Chiangmai 3 Substation(CMC)2.At OPTREX Co.,Ltd.(NIA10)3.At DrissenCo.,Ltd.(NIU 02) Provincial Electricity Authority, Thailand

  29. Power Quality Measurement at OPTREX Co.,Ltd. 3 times for Transient 25 Jul – 26 Jul 2011 Provincial Electricity Authority, Thailand

  30. Power Quality Measurement at DrissenCo.,Ltd. Abnormal Harmonic 5th order at Main Capacitor 12 Sep – 15 Sep 2011 Provincial Electricity Authority, Thailand

  31. Power Quality Measurement at Central PattanaChiangmai Two events of Voltage Sagat MDB11 from 10 -16 Jun 2011Instantaneous(0.01-0.6S) Sag 46% Provincial Electricity Authority, Thailand

  32. Conclusion The Impact of Voltage Sag for PEA Area 1(North) Customers in North Industrial Estate 1. The Result of 1P-Fault in 115 kV Transmission Line (From CMC to LNC Substation) Effects Voltage Sag not less than 0.8 pu. 2. The Result of 1P-Fault in 22 kV Distribution Line (NIU,NIA,LNCSubstation) Effects Voltage Sag not less than 0.6 pu. 3.Uniform Fault Rate of LNC Substation (From TR.1) has the Most Value and Implies that at the Same Distance from Substation if Comparing with Other Substation in Industrial Park ,LNC Substation (From TR.1) must have the Most Effect from Voltage Sag Provincial Electricity Authority, Thailand

  33. SuwiphaKittitanapisarn. PEA Area1 (North) Chiang Mai, THAILANDsuwipai@yahoo.com Provincial Electricity Authority, Thailand

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