Multi-Chamber Arrester Field Test Experience in Asia High Lightning - - PowerPoint PPT Presentation

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

2015 (c) Streamer International AG

Streamer SmartArresters Installations

On the market for 20 years and more than 1 million pieces installed

Russia > 1M pcs China - 10kV - 3000 pcs Indonesia – 20kV - 600 pcs Iran - 20kV - 1000pcs Malaysia – 1 line 35kV 400 pcs Thailand – 2 lines 24kV 200 pcs UAE – 2 lines 11kV Brazil – 3 lines 23kV & 13,8kV 165 pcs

Introduction

Bare conductor, 11kV, 22kV, 33kV

Lightning

Overall Mechanism

Lightning strikes ON or CLOSE to the line Overvoltage on the line Flashover of insulation Follow Current (short circuit) Breakage of conductor or insulator Trip

Self Extinction

Self Extinction

Multi Chamber Arrester

Lightning strikes ON

• r CLOSE to the line

Overvoltage

• n the line

Flashover of insulation Follow Current (short circuit) Breakage of conductor

• r insulator

Trip Self Extinction Self Extinction

Protects Insulator and conductor maintain voltage across line and crossarm Prevents Follow Current thanks to arc chambers Ensure discharge according to quality of pole grounding

Multi Chamber Arrester

Prevents Follow Current thanks to arc chambers

• Air discharge
• Quenching after on half period
• 8 ms maximum
• No outage on the line

Follow Current (short circuit)

2015 (c) Streamer International AG

Questions ?

Are the EQ devices (Multi-Chamber Arrester) really useful as Medium Voltage line and what are the benefits?

• Technically useful? 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?

Country Network Nominal P-P Voltage / kV Insulator standard (+) Lightning Impulse Withstand in kV Conductor standard (+) Lightning Impulse Withstand / KV

THAILAND 20 180 200 CHINA 10 180 VIETNAM 20 180 200 INDONESIA 20 125 125 MALAYSIA 33 250 CAMBODIA 20 125 125

Lines Parameters

Conductor’s insulation participates to insulation

Flashover rates

Country Cloud to Ground Flash Density / Flashes per km2 per year Expected Flashover Rate per 100km per year Insulator + Conductor Insulator only

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

50 to 70m GI Station HV/MV transformer Ex : 110/22kV

3 last km before HV/MV substation Vulnerable Sections

Throughout the backbone

CHINA VIETNAM THAILAND INDONESIA 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

Will help you qualify which section of the line is responsible for the trip at the substation or at the recloser Will help qualifying the number of

• utages on the line

Year 1 compared to Year 2. It will give a large overview Will help you differentiate trip at substation or at recloser due to lightning from other causes

Lightning Data Line Fault Indicator/Recorder Switchgear logger Product Pilot Line Validation

Swichgear Logger Lightning Data Fault Recorder 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

Glass Indicator

Results and Observations

Country Voltage / kV Numbers Arresters Installed Operations over 1 year Lightning Density in Flashes per km2 during the year Crack(s) & damage(s)

• n arresters reported

CHINA

(south)

10 67 8 9.67 INDONESIA

(West Java)

24 44 11 17,07

12% 25%

Operation Qualification

Country

Before MCA Installation After MCA Installation

Observation duration Nb of Trips dues to lightning Ground Flash Density km2/year Tripping rate over 100km Observation duration Nb of Trips dues to lightning Ground Flash Density km2/year Tripping rate

• ver 100km

INDONESIA 601 days 9 13.16 ≈55 354 days 17.07 ≈0 CHINA 365 days 4 13.75 ≈100 365 days 9.67 ≈0

15 15 15 15 15 15

Neutral

Single operation Pair

• peration

Country Numbers Arresters Installed Arresters that

• perated over 1year

Single arrester

• peration

Pair arrester

• peration

Triplet arrester

• peration

CHINA (south) 67 8 2 6 INDONESIA (West Java) 44 11 2 6 3 TOTAL 111 19 4 (21%) 12 (63%) 3 (15%)

Results and Observations

2012 (c) Streamer International AG

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

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