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消弧线圈是一个具有铁心

网址:www.xiaohuxianquan.com.cn  2022-06-18  作者:admin    阅读:

消弧线圈是一个具有铁心的可调电感线圈,接地电流通过消弧线圈呈电感电流,当单相出现短路故障时,流经消弧线圈的电感电流与流过的电容电流相加为流过短路接地点的电流,电感电容上电流相位相差180度,将接地电流补偿成较小的数值或接近于零。当两电流的量值小于发生电弧的最小电流时,电弧就不会发生,以防止电弧重燃,从而有效地降低过电压值,消除了接地处的电弧以及由此引起的各种危害,也不会出现谐振过电压现象。电力系统配电线路经消弧线圈接地,为小电流接地系统的一种,10-66kV电压的等级下的电力线路多属于这种情况。
The arc suppression coil is an adjustable inductance coil with an iron core. The grounding current is an inductive current through the arc suppression coil. When a single-phase short-circuit fault occurs, the inductive current flowing through the arc suppression coil and the current flowing through the capacitor are added to form the current flowing through the short-circuit grounding point. The phase difference of the current on the inductance and capacitance is 180 degrees, so the grounding current is compensated to a smaller value or close to zero. When the value of the two currents is less than the minimum current of the arc, the arc will not occur, so as to prevent the arc from re igniting, so as to effectively reduce the over-voltage value, eliminate the arc at the grounding point and the harm caused by it, and there will be no resonance overvoltage phenomenon. The distribution line of power system is grounded by arc suppression coil, which is a kind of small current grounding system. The power line with voltage of 10-66kv mostly belongs to this situation.
消弧线圈早期采用人工调匝式固定补偿的消弧线圈,称为固定补偿系统。固定补偿系统的工作方式是:将消弧线圈整定在过补偿状态,其过补程度的大小取决于电网正常稳态运行时不使中性点位移电压超过相电压的15%,之所以采用过补偿是为了避免电网切除部分线路时发生危险的串联谐振过电压。因为如整定在欠补偿状态,切除线路将造成消弧线圈河北立体车库 消防报警器塑料配件 电缆接地箱 电缆保护接地箱 塑料土工格栅 消弧线圈装置 电容电流减少,可能出现全补偿或接近全补偿的情况。但是这种装置运行在过补偿状态当电网中发生了事故跳闸或重合等参数变化时脱谐度无法控制,以致往往运行在不允许的脱谐度下,造成中性点过电压,三相电压对称遭到破坏。
In the early stage of arc suppression coil, fixed compensation coil with manual turn adjustment is called fixed compensation system. The working mode of the fixed compensation system is: the arc suppression coil is set in the over compensation state, and the degree of over compensation depends on that the neutral point displacement voltage does not exceed 15% of the phase voltage during the normal and steady-state operation of the power grid. The reason why the over compensation is used is to avoid the dangerous series resonance overvoltage when the power grid cuts off some lines. If the setting is in the state of under compensation, the capacitance current of arc suppression coil will be reduced by cutting off the line, which may lead to full compensation or close to full compensation. However, when the unbalance of the three-phase power grid is out of the normal state, it is impossible for