高壓電阻柜 高壓變電類電阻器
中性點(diǎn)經(jīng)電阻接地，即是中性點(diǎn)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(fā)電機(jī)回路發(fā)生單相接地時(shí)電流過大容易造成發(fā)電機(jī)鐵芯灼傷，同時(shí)產(chǎn)生的弧光接地過電壓易破壞耐壓水平較弱的發(fā)電機(jī)絕緣保護(hù)。
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(diǎn)接地電阻器性能neutral grounding resistor performance:
常規(guī)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(shí)間allow flow time: 5s，10s，30s，60s，
10minutes，連續(xù)運(yùn)行continuous operation；
防護(hù)等級(jí)protection grade: ip20～ ip55，
安裝方式installation：室內(nèi)indoor,室外outdoor
可以輔助安裝隔離開關(guān)，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(dāng)額定時(shí)間為10秒,溫升為760℃；
at the rated time of 10s, maximum temperature rise of 760℃;
2.當(dāng)額定時(shí)間為10s<t<10m時(shí)，溫升為610℃；
at the rated time of 10s<t<10m, maximum temperature rise of 610℃;
3.連續(xù)工作時(shí)，溫升為385℃；
when operating continuously, maximum temperature rise of 385℃
執(zhí)行標(biāo)準(zhǔn)executive standard:
dl/t780-2001 配電系統(tǒng)中性點(diǎn)接地電阻器行業(yè)標(biāo)準(zhǔn)
specification for neutral-earth resistance in distribution system
gb311.1-1997 高壓輸變電設(shè)備的絕緣配合
insulation co-ordination of high voltage transmission and transformation equipment
gb4208-1993 外殼防護(hù)等級(jí)（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(shù)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(shù)條件
high voltage post insulators ceramic material part 1:technical specification
gb/t16927.1-1997 高電壓試驗(yàn)技術(shù) 第1部分：一般試驗(yàn)要求
high voltage test techniques part 1:general requirements
ieee32-1990 中性點(diǎn)接地裝置的要求、術(shù)語(yǔ)和試驗(yàn)程序
requirents,terminology and test procedure for neutral grounding devices
使用環(huán)境 using conditions:
flnr中性點(diǎn)接地電阻使用環(huán)境按dl/t593-1996 3.1的規(guī)定。
a)戶內(nèi)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(zhì)不小于for porcelains ≮18mm/kv，
有機(jī)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(jí)20mm/kv，level ⅲ級(jí)25mm/kv，level ⅳ級(jí)31mm/kv。
注：超過正常使用條件時(shí)，由用戶與制造廠協(xié)商確定。
remark: when the using conditions are beyond the normalization,the user should make confirmation with the manufacturer.
