| 变压器接地电阻柜作用： |
| 添加时间：2023/12/11 16:48:49 浏览次数： |
| 变压器接地电阻柜作用：我国电力系统常用的中性点接地方式有：中性点直接接地、中性点不接地、中性点经消弧线圈接地(谐振接地)、中性点经电阻接地这四种方式。电力系统接地运行方式涉及电网的安全运行、供电可靠性、用户用电安全等诸多重要问题。中性点经电阻接地就是在电网中性点与地之间串联接入某一电阻器。适当选择所接电阻器的阻值，不仅可以泄放单相接地电弧后半波的能量，从而减少电弧重燃的可能性，抑制电网过电压的辐值，还可以提高继电保护装置的灵敏度以作用于跳闸，从而有效保护系统正常运行。 Function of transformer grounding resistance cabinet: The common grounding modes of neutral point in China's power system include direct grounding of neutral point, non-grounding of neutral point, grounding of neutral point through arc suppression coil (resonance grounding), and grounding of neutral point through resistance. The grounding operation mode of power system involves many important issues such as safe operation of power grid, reliability of power supply, safety of user's power, etc. The resistance grounding of neutral point is to connect a resistor in series between neutral point and ground in power grid. Properly choosing the resistance value of the resistor can not only release the energy of half wave after single-phase grounding arc, thus reducing the possibility of arc reburning, restraining the radiation value of overvoltage in power grid, but also improve the sensitivity of relay protection device to act on tripping, thus effectively protecting the normal operation of the system |
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