| 微机消谐装置的主要缺点 |
| 添加时间：2017/5/26 17:43:05 浏览次数： |
| 微机消谐装置的主要缺点是难以正确区分基波谐振和单相接地。目前，对基波谐振和单相接地故障判据的主要区别在于零序电压U0的高低。通常，基频谐振定为当U０≥150V时；当30V≤U０＜145V时定为单相接地故障。为了防止在单相接地时由于装置误动使TV长时间过负荷而烧毁的情况发生，通常将该装置基频谐振的判据电压定得比较高。这样，在工频位移电压不是很高的情况下（如空母线合闸）装置将无法动作，就可能使某些励磁特性欠佳、铁心易饱和TV的熔丝熔断。而且这种装置当电网对地电容较大时，它对防止间歇性接地或接地消失瞬间互感器因瞬时饱和涌流而造成熔丝熔断的事故无能为力。此外，在持续时间较长的间歇电弧过电压激发下，流过TV高压绕组的电流将显著增大，仍可能会烧坏TV。 The main drawback of microcomputer antiharmonic devices is that it is difficult to distinguish the basic harmonic and the single phase. At present, the main difference between the base wave resonance and the single-phase ground fault criterion lies in the zero sequence voltage U0. In general, the base frequency resonance is defined as when U0 is greater than or equal to 150V; When 30V is less than or equal to U0 < 145V, it is a single-phase ground fault. In order to prevent maloperation because when single-phase grounding device makes the TV for a long time live load and fire happens, usually will be the device of the criterion of fundamental frequency resonance voltage set too high. So, in the case of displacement of the power frequency voltage is not very high, such as empty bus switching device will not be able to action, can make some poor excitation characteristic, core saturation TV easily blown fuse. And the device when the grid earth capacitance larger, it to prevent the intermittent grounding or disappear instantly transformer caused by transient saturated flow blown fuse accident can do. In addition, the current of flowing through the TV high voltage winding will be significantly increased after the prolonged intermittent arc overvoltage, and the TV will still be burned. |
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