Multi-Chamber Arrester Field Test Experience in Asia High Lightning Density Area JENS R. BOTHE
EasyQuench (EQ) Line Lightning Arresters Cost & Technical Benefits Jens R. Bothe Streamer International Switzerland
Streamer SmartArresters Installations On the market for 20 years and more than 1 million pieces installed Russia > 1M pcs China - Iran - 20kV - 1000pcs 10kV - 3000 pcs Malaysia – 1 line UAE – 2 lines 35kV 400 pcs 11kV Thailand – 2 lines 24kV 200 pcs Brazil – 3 lines 23kV & 13,8kV 165 pcs Indonesia – 20kV - 600 pcs 2015 (c) Streamer International AG
Introduction Bare conductor, 11kV, 22kV, 33kV Lightning
Overall Lightning strikes ON or CLOSE Mechanism to the line Overvoltage on the line Flashover of insulation Follow Current Self Extinction (short circuit) Breakage of conductor or Self Extinction Trip insulator
Multi Chamber Arrester Lightning strikes ON or CLOSE to the line Overvoltage Ensure discharge according on the line to quality of pole grounding Flashover of insulation Protects Insulator and conductor maintain voltage Follow Current across line and crossarm Self Extinction (short circuit) Prevents Follow Current Breakage of conductor Trip Self Extinction thanks to arc chambers or insulator
Multi Chamber Arrester Prevents Follow Current Follow Current thanks to arc chambers (short circuit) • Air discharge • Quenching after on half period • 8 ms maximum • No outage on the line
Questions ? • Technically useful? Benefits? Are the EQ devices (Multi-Chamber Arrester) really useful as Medium Voltage line and what are the benefits? • Withstand lightning density? Can this device actually withstand the level of lightning density and amplitude of high lightning area line Asian region? • Work in various configuration? Can the device work in the various configuration of neutral earth arrangement, pole and cross-arm design of the different countries? • Cost efficiency ? What performance can we really expect in terms of cost? 2015 (c) Streamer International AG
Lines Parameters Network Insulator standard (+) Conductor standard (+) Country Nominal Lightning Impulse Lightning Impulse P-P Voltage / kV Withstand in kV Withstand / KV THAILAND 20 180 200 CHINA 10 180 0 VIETNAM 20 180 200 INDONESIA 20 125 125 MALAYSIA 33 250 0 CAMBODIA 20 125 125 Conductor’s insulation participates to insulation
Flashover rates Expected Flashover Rate per Cloud to Ground Flash 100km per year Country Density / Flashes per km2 Insulator + per year Insulator only Conductor THAILAND 15 43 77 CHINA 9 16 16 VIETNAM 15 39 70 INDONESIA 20 78 143 MALAYSIA 20 107 107 CAMBODIA 15 53 98 +
Field Test Method & Milestones Ø 1 year process
Location of Arresters GI Station CHINA HV/MV transformer Ex : 110/22kV 3 last km before HV/MV substation Vulnerable VIETNAM INDONESIA Sections 50 to 70m Throughout the backbone THAILAND CAMBODIA Country Voltage / kV # Arresters MCA installed THAILAND 24 104 SAi20z CHINA 10 67 SAi10z VIETNAM 22 60 SAi20z INDONESIA 24 44 SAi20z CAMBODIA 22 60 SAi20z
Data Collection Line Fault Indicator/Recorder Will help you qualify which Lightning Data section of the line is responsible for the trip at the substation or Fault at the recloser Recorder Will help you differentiate trip at substation or at recloser due to lightning from other causes Switchgear logger Product Pilot Line Swichgear Lightning Will help qualifying Logger Validation Data the number of outages on the line Year 1 compared to Year 2. It will give a Glass Indicator large overview Glass Indicator Will show you that arrester operated and which one. If periodic visits are made on the line, a determination on when the arresters operated can be made
Results and Observations Numbers Arresters Lightning Density in Flashes Crack(s) & damage(s) Country Voltage / kV Operations over 1 year Installed per km2 during the year on arresters reported 12% CHINA 10 67 8 9.67 0 (south) INDONESIA 25% 24 44 11 17,07 0 (West Java)
Operation Qualification Before MCA Installation After MCA Installation Country Ground Flash Observation Nb of Trips dues to Ground Flash Tripping rate over Observation Nb of Trips dues to Tripping rate Density duration lightning Density km2/year 100km duration lightning over 100km km2/year ≈55 ≈0 INDONESIA 601 days 9 13.16 354 days 0 17.07 ≈100 ≈0 CHINA 365 days 4 13.75 365 days 0 9.67
Results and Observations Pair Single operation operation Neutral 15 15 15 15 15 15 Numbers Arresters that Single arrester Pair arrester Triplet arrester Country Arresters Installed operated over 1year operation operation operation CHINA 67 8 2 6 0 (south) INDONESIA 44 11 2 6 3 (West Java) TOTAL 111 19 4 (21%) 12 (63%) 3 (15%)
Conclusion • SmartArresters have been installed on various networks over a year WW. The example in Asia, high lightning density areas, show promising results in terms of lightning withstand, protection of covered conductor, and reduction of outages due to lightning. • SmartArrester protection shows to be a cost efficient solution for the protection of the line against lightning. Economical study shows very positive results. • Covered conductors medium voltage lines even with high CFO (ex. Spacer Cable Systems) remain strongly affected by lightning. • Qualification of accurate performances expectation need still to be made. 2012 (c) Streamer International AG
Thank you for your Attention You can visit our booth M27 2012 (c) Streamer International AG
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