Power transformer neutral point protection explanation, easy to understand, it is recommended to collect and watch slowly!

The transformer neutral grounding is available in a variety of ways, such as direct and gap grounding, to deal with ground faults. In the power system, when the ground fault is faulted, the neutral grounding transformer needs to be equipped with zero sequence current protection, including two time limits, a short time to break the bus connection or a segmented circuit breaker to reduce the scope of the fault, and a long time to break the circuit breaker on each side of the transformer. After the neutral grounding transformer jumps out, the zero sequence voltage of the power grid rises or the resonant overvoltage may threaten the neutral point ungrounded transformer insulation, so it is necessary to install zero sequence voltage or gap zero sequence current protection. Large transformers are the core equipment of the power system, and the cost is high, so the power grid above 110 thousand volts mostly uses graded insulation transformers. The following article will give you a detailed talk about the neutral point protection of power transformers.

▌01 Protective grounding method of transformer neutral point

▌02 Protection method of transformer neutral point