建筑电气
建築電氣
건축전기
BUILDING ELECTRICITY
2015年
4期
30-33
,共4页
IT系统%一次故障%二次故障%接地故障%故障电流%单相接地故障%故障回路电阻%预期接触电压
IT繫統%一次故障%二次故障%接地故障%故障電流%單相接地故障%故障迴路電阻%預期接觸電壓
IT계통%일차고장%이차고장%접지고장%고장전류%단상접지고장%고장회로전조%예기접촉전압
IT system%single fault%double faults%earth fault%fault current%single-phase earth fault%fault circuit resistance%prospective touch voltage
介绍IT 系统正常运行时的线路参数，一次故障、二次故障时的接地故障电流、预期接触电压及保护电器的选择。并得出相应的结论，即IT系统发生一次接地故障时还可正常运行，但绝缘监测装置须报警，以免发生第二次接地故障引发断电。
介紹IT 繫統正常運行時的線路參數，一次故障、二次故障時的接地故障電流、預期接觸電壓及保護電器的選擇。併得齣相應的結論，即IT繫統髮生一次接地故障時還可正常運行，但絕緣鑑測裝置鬚報警，以免髮生第二次接地故障引髮斷電。
개소IT 계통정상운행시적선로삼수，일차고장、이차고장시적접지고장전류、예기접촉전압급보호전기적선택。병득출상응적결론，즉IT계통발생일차접지고장시환가정상운행，단절연감측장치수보경，이면발생제이차접지고장인발단전。
The circuit parameters during normal operation of IT system, the earth fault current in case of single fault and double faults, the prospective touch voltage and choice of protective devices are introduced; and corresponding conclusion is made: in the first fault, IT system may keep normal operation;but the insulation monitoring device must alarm to avoid power failure caused by the second fault.
