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发表于 2013-9-23 15:51
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来自: 中国香港
windsgy 发表于 2013-9-23 10:01
很感谢你提供的数据!
我研究了一下IEC60092 352的3.2 voltage rating 见附件!
我觉得还需要分析 ...
For 1kV to 11 KV system, the power distributing system of the folowings are recommended:
a. 3 phase, 3 wires insulated;
b. 3 phase, 3 wires neutral earthed, via neutral direcly earthed;
c 3 phase, 3 wires neutral earthed, by neutral high impedence earthed;
Accoding to IEC 60092-202, Short Circuit protection shall be provided in each non-earthed line, in order that, single earth fault in any line will immeditately make protective device trip-off, as result, the system will be keep in safe.
So far,the circuit category C mentioned IEC 60092-352 are no suitable for the system have been provided with protection system as required by IEC 60092-202.
In consequence, the cables of 8.7/15(15) are considered being suitable for 11kV system.
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