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中性點接地電阻G

中性點接地電阻G
瀏覽量:293 上傳更新:2019-04-18
中性點接地電阻G

中性點接地電阻G


中性點經電阻接地,即是中性點與大地之間接入一定電阻值的電阻。

Neutral point ground through resistor, that is the resistor between the neutral point and the ground access certain resistance value.

發電機回路發生單相接地時電流過大容易造成發電機鐵芯灼傷,同時產生的弧光接地過電壓易破壞耐壓水平較弱的發電機絕緣保護。

Generator circuit of single-phase grounding current is too likely to cause the generator stator core burns, while the arc grounding overvoltage easily destroy generator insulation protection with the low withstanding voltage level.

中性點接地電阻器性能Neutral grounding resistor performance:

常規電阻主要性能如下:

使用電壓范圍寬Using voltage range: 0.33~110kV  

故障電流大Fault current: 1~5000A

阻值范圍寬Wide resistance range: 0.5~1500Ω

允許通流時間Allow flow time: 5S,10S,30S,60S,

10minutes,連續運行continuous operation;

防護等級Protection grade: IP20~ IP55,

安裝方式Installation:室內indoor,室外outdoor

     可以輔助安裝隔離開關,斷路器,CT,PT等

     Can assist the installation of isolating switch, circuit breaker, CT, PT etc.

允許溫升The permissible temperature rise:

1.當額定時間為10秒,最大溫升為760℃;

  At the rated time of 10S, maximum temperature rise of 760℃;

2.當額定時間為10S<t<10M時,最大溫升為610℃;

  At the rated time of 10S<t<10M, maximum temperature rise of 610℃;

3.連續工作時,最大溫升為385℃;

     When operating continuously, maximum temperature rise of 385℃

執行標準executive standard:

 DL/T780-2001  配電系統中性點接地電阻器行業標準

Specification for neutral-earth resistance in distribution system

GB311.1-1997   高壓輸變電設備的絕緣配合

Insulation co-ordination of high voltage transmission and transformation equipment

GB4208-1993    外殼防護等級(IP代碼)

Degrees of  protection provided by enclosure

GB1208-1997    電流互感器Current transformers

GB/T12944.1-1991  高壓穿墻瓷套管技術條件

High-voltage ceramic wall bushings technical specification

GB8287.1-1998     高壓支柱瓷絕緣子 第1部分:技術條件

High voltage post insulators ceramic material Part 1:Technical Specification

GB/T16927.1-1997  高電壓試驗技術 第1部分:一般試驗要求

High voltage test techniques Part 1:General requirements

 IEEE32-1990     中性點接地裝置的要求、術語和試驗程序

  Requirents,Terminology and Test Procedure for Neutral Grounding Devices

使用環境 Using conditions:

FLNR中性點接地電阻使用環境按DL/T593-1996 3.1的規定。

 a)戶內Indoors:

周圍空氣溫度:Environment temperature: +40℃~-15℃;

海拔Elevation:1000m、3000m;

最小公稱爬電比距Minimal creepage distance:     

瓷質不小于for porcelains ≮18mm/kV,     

有機材料不小于for organic materials ≮20mm/kV。

b)戶外Outdoors:

周圍空氣溫度:Environment temperature: +40℃~-35℃;

海拔Elevation:1000m、3000m;

最小公稱爬電比距Minimal creepage distance:     

LevelⅡ級20mm/kV,Level Ⅲ級25mm/kV,Level Ⅳ級31mm/kV。

注:超過正常使用條件時,由用戶與制造廠協商確定。

Remark: When the using conditions are beyond the normalization,the user should make confirmation with the manufacturer.


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