高压电阻柜中性点接地电阻柜大工业类电阻柜风能光伏电阻器
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面议
中性点经电阻接地,即是中性点与大地之间接入一定电阻值的电阻。
Neutral point ground through resistor, that is the resistor between the neutral point and the ground access certain resistance value.
发电机回路发生单相接地时电流过大容易造成发电机铁芯灼伤,同时产生的弧光接地过电压易破坏耐压水平较弱的发电机绝缘保护。
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.
中性点接地电阻器性能Neutral grounding resistor performance:
常规电阻主要性能如下:
使用电压范围宽Using voltage range: 0.33~110kV
故障电流大Fault current: 1~5000A
阻值范围宽Wide resistance range: 0.5~1500Ω
允许通流时间Allow flow time: 5S,10S,30S,60S,
10minutes,连续运行continuous operation;
防护等级Protection grade: IP20~ IP55,
安装方式Installation:室内indoor,室外outdoor
可以辅助安装隔离开关,断路器,CT,PT等
Can assist the installation of isolating switch, circuit breaker, CT, PT etc.
允许温升The permissible temperature rise:
1.当额定时间为10秒,大温升为760℃;
At the rated time of 10S, maximum temperature rise of 760℃;
2.当额定时间为10S<t<10M时,大温升为610℃;
At the rated time of 10S<t<10M, maximum temperature rise of 610℃;
3.连续工作时,大温升为385℃;
When operating continuously, maximum temperature rise of 385℃
执行标准executive standard:
DL/T780-2001 配电系统中性点接地电阻器行业标准
Specification for neutral-earth resistance in distribution system
GB311.1-1997 高压输变电设备的绝缘配合
Insulation co-ordination of high voltage transmission and transformation equipment
GB4208-1993 外壳防护等级(IP代码)
Degrees of protection provided by enclosure
GB1208-1997 电流互感器Current transformers
GB/T12944.1-1991 高压穿墙瓷套管技术条件
High-voltage ceramic wall bushings technical specification
GB8287.1-1998 高压支柱瓷绝缘子 第1部分:技术条件
High voltage post insulators ceramic material Part 1:Technical Specification
GB/T16927.1-1997 高电压试验技术 第1部分:一般试验要求
High voltage test techniques Part 1:General requirements
IEEE32-1990 中性点接地装置的要求、术语和试验程序
Requirents,Terminology and Test Procedure for Neutral Grounding Devices
使用环境 Using conditions:
FLNR中性点接地电阻使用环境按DL/T593-1996 3.1的规定。
a)户内Indoors:
周围空气温度:Environment temperature: +40℃~-15℃;
海拔Elevation:1000m、3000m;
小公称爬电比距Minimal creepage distance:
瓷质不小于for porcelains ≮18mm/kV,
有机材料不小于for organic materials ≮20mm/kV。
b)户外Outdoors:
周围空气温度:Environment temperature: +40℃~-35℃;
海拔Elevation:1000m、3000m;
小公称爬电比距Minimal creepage distance:
LevelⅡ级20mm/kV,Level Ⅲ级25mm/kV,Level Ⅳ级31mm/kV。
注:超过正常使用条件时,由用户与制造厂协商确定。
Remark: When the using conditions are beyond the normalization,the user should make confirmation with the manufacturer.