Wide-area distance protecting method for transformer substations

Abstract

The invention discloses a wide-area distance protecting method for transformer substations. The wide-area distance protecting method for the transformer substations comprises the steps that a master station-substation protection control system comprising a master station and multiple substations is established in a regional power grid; on-site judgment of wide-area distance protection is completed by the substations with the transformer substation with secondary direct-current power supply disappearing and a line connected with the transformer substation as protection targets, and the information is uploaded to the master station; after the master judges that a certain transformer substation loses power, wide-area distance protection of the power-losing area of the transformer substation is completed according to the on-site information uploaded by the substations, and then faults in the power-losing area of the transformer substation are isolated rapidly. According to the wide-area distance protecting method for the transformer substations, when the serious accident that the secondary direct-current power supply of the transformer substation in the power grid disappear, the faults in the power-losing area in the transformer substation can isolated rapidly, and safe and stable operation of the power grid is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of intelligent substation operation, in particular to a substation-oriented wide-area distance protection method. Background technique [0002] The disappearance of the secondary DC power supply of the power substation (the DC loss of the protection device or the DC loss of the operating power supply) is a serious accident in the operation of the substation. After the secondary DC power supply disappears, all the protection devices or operating circuits of the substation cannot work. The main transformer, bus differential, high reactance, and line outlets all lose protection. Once a fault occurs, the station will have no protection action, and must wait for the delay action of remote backup protection of other adjacent stations to isolate the fault. Such as figure 1 Substation C in substation C loses all power. When the f1 fault occurs on the AC line, the line protection of CB2 cannot operate to remove the ...

AI Technical Summary

Problems solved by technology

Since the remote backup protection needs to consider the coordination relationship between segments, its action time is relatively slow. In severe cases, its action time may not meet the requirements of system stability, which poses a serious threat to the safe and stable operation of the system.

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