Category:power

Question:
symmetrical three-phase power connection, line voltage is relative to the voltage of a few have been, and the phase voltage phase-advance phase voltage 30a; 3 b; 3 / 1 C root 3. newly installed and overhaul after the low-voltage lines and equipment, insulation resistance of not less than the number of requests. General lighting uses no more than the number of v-to-ground voltage.

Answer:
roots of not less than three times the
newly installed after an overhaul of not less than 0.5 megohm megohm
220V

Answer:
such as fillet, then the line voltage is equal to phase voltage, phase the same.
, such as satellite access, then the line voltage is equal to square root of 3 times the phase voltage, line voltage is 30 degrees ahead of phase voltage.

Chinese:请教

类别: 电力

问题:
对称三相电源连接时，线电压是相电压的几被，而且相电压 相位超前相电压30a;3 b;3/1 C 根3. 新装和大修后的低压线路和设备，要求绝缘电阻不低于多少。 一般照明采用不超过多少v的对地电压。

回答:
根号3倍
新装不低于 1兆欧 大修后不低于0.5兆欧
220V

回答:
如角接,则线电压等于相电压,相位相同.
如星接,则线电压等于根号3倍相电压,线电压超前相电压30度.