Explore the direction of protecting the transformer power parity method

Power transformer protection is an important direction of backup protection of transformers. As adjacent components and the internal fault transformer backup protection plays an important role in preventing the expansion of the scope of the failure to ensure the safe operation of the system. Primary and secondary wiring secondary wiring, voltage transformer secondary wiring and protective devices has its  electric meter  relationship correctness, and current transformer, which in actual operation, it is easy due to the wiring polarity errors The misoperation or refuse to move. This paper attempts to explore the direction of power protection, summed up in a simple and reliable method of calibration. The results show that by  air circuit breaker the actual failure of the power system, combined with CT, PT wiring polarity analysis can simply and reliably protect the correctness of power direction direction can be tested, given the equipment acceptance and routine inspection work, which greatly simplifies the work amount.

When charging the transformer should put all protection, and to ensure there is sufficient sensitivity

When charging the transformer should put all protection , and to ensure there is sufficient sensitivity , taking into account the impact of inrush current protection system . To ensure the stability of the system , if necessary, reduce the charge should be preceded by the relevant line of active power. Large current grounding system before charging or transformer outage must be neutral grounding blade closed. After charging , check the supply voltage, so that each side of the voltage transformer does not exceed 5% of the corresponding tap voltage . When the transformer into operation , should be less affected side of the inrush current power transmission . Generally start charging power supply side , after closing the load side switch. When a power outage , you should pull the load side of the switch, pull the power supply side of the switch. If 220kV transformers high and low pressure  mcb circuit breaker , when power by charging high side and low pressure side of the tie should be on the low side splitting power outage . When the ring transformer operating system , you should select the correct charging terminal to reduce the voltage difference tied at . When the transformer parallel operation , shall comply with the conditions of parallel operation . Transformers stop, when an impact  power transformers  as when the power would run the system transformer neutral grounding , protection must be adjusted according to the requirements of operating procedures in the adjustment process, should be fit after pulling principles. For stop after power operation in hot standby transformer neutral point grounding blade should close the state.