This device use the principle of additional DC power supply in main feeding switch, and use the principle of direction of zero sequence power in branch feeding switch.
该装置在总馈电开关处的漏电保护装置使用附加直流电源原理，在分支馈电开关处的漏电保护装置使用零序功率方向式保护原理。
Electrified railway negative sequence and the harmonic seriously affected grid power quality, reduced the reliability of power supply.
电气化铁路产生的负序、谐波严重地影响了电网电能质量，降低了电网供电的可靠性。
The sequence of water supply is that the Power Plant generating and water supply for living is prior, followed by water for industry and irrigation in order.
供水次序为先蓄能电站发电与生活供水，而后依次为工业用水与农业灌溉。
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