Xycom 70490-001

电网的不断发展使线路参数发作变化，铁磁式电压互感器的很多运用，使电网发作铁磁谐振的可能性增大。所以，为了使电网可靠供电，采取有用办法避免铁磁谐振的发作。
避免铁磁谐振的发作，应从改动供电体系电气参数着手，损坏回路中发作铁磁谐振的参数匹配。这么既可避免电压互感器发作磁饱满，又可避免电压互感器铁磁谐振过电压的发作。
4.1 改动电气参数
4.1.1 装设继电维护设备
当电网发作单相接地毛病时，为改动电压互感器的谐振参数，可经过装设一套继电维护设备来完成。该设备是运用单相接地时所发作的较大谐振电流，发动电流继电器投入，将电压互感器二次侧开口三角处绕组短接。当毛病扫除后，维护设备康复原状，电压互感器康复正常运转。
4.1.2 选用不易饱满的或三相五柱式电压互感器
10 kV体系中运用的电压互感器，应选用励磁感抗大于1.5 MΩ的电压互感器。
4.1.3 削减电压互感器台数
在同一电网中，应尽量削减电压互感器的台数，尤其是约束中性点接地电压互感器的台数。如变电所的电压互感器，只作为测量仪表和维护用时，其中性点不允许接地。
4.1.4 串接单相互感器
在三相电压互感器一次侧中性点串接单相互感器，使三相电压互感器等值电抗明显增大，以满足Xc0/Xm≤0.01的条件，可避免因深度饱满而导致的谐振。
4.1.5 每相对地加装电容器
此法可使网络等值电容变小，网络等值电抗不能与之匹配，然后谐振。
4.1.6 在中性点装设消弧线圈
在10 kV体系中发作谐振，且单相接地电流值较大或接近30 A时，可将中性点经过消弧线圈接地。
4.1.7 投入备用线路
当体系中只有一组电压互感器投入的情况下，若供电线路总长度较短时，可投入有些备用线路，以增加分布电容来避免谐振的发作。
4.2 耗费谐振能量
4.2.1 在TV开口三角形侧并联阻尼电阻
当电网运转正常时，电压互感器二次侧开口三角处绕组两头没有电压，或仅有极小的不对称电压。当电网发作单相接地毛病时，由于此电阻阻值较小，故绕组两头近似于短接，起到了改动电压互感器参数的效果。这一办法不仅能避免电压互感器发作磁饱满，而且能有用地耗费谐振能量，避免发作谐振过电压。此办法常用在要求不太高的变电站，如消谐电阻选用电灯泡或电阻丝，当其损坏后将不会有消谐效果；当体系发作单相接地时，在开口三角侧将发作100 V的电压，而由于电灯泡或电阻丝的冷态电阻是较小的，这将在TV开口三角侧流过较大的电流导致TV损坏。

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