Safety automatic device integrating bus tie backup power automatic switching and main transformer backup power automatic switching functions

Abstract

The invention provides a safety automatic device integrating bus tie backup power automatic switching and main transformer backup power automatic switching functions, which comprises a host machine and a slave machine. The host machine comprises a DSP plug-in and a communication plug-in; the slave machine comprises a DSP plug-in, an alternating current plug-in, an input plug-in and an output plug-in; the communication plug-in in the host machine is in communication connection with the slave machine; the DSP plug-in in the host machine transmits a tripping and closing command to the slave machine by the communication plug-in; the alternating current plug-in in the slave machine is used for acquiring a signal and uploading the signal to the DSP plug-in of the slave machine after carrying outprocessing; the input plug-in acquires switch quantity signals of a bus tie switch and an in-transformer switch and uploads the switch quantity signals to the DSP plug-in of the slave machine; the DSP plug-in of the slave machine uploads a current digital signal, a voltage digital signal and the switch quantity signals to the host machine; and the output plug-in is used for transmitting the tripping and closing command to the bus tie switch and the in-transformer switch. According to the invention, production investment cost of a power grid can be reduced, workload of the device in the operation and maintenance process is reduced, and utilization of secondary circuit resources of main transformer backup power automatic switching and bus tie backup power automatic switching in a transformer substation is optimized.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an automatic safety device integrating the functions of automatic switch-on of bus tie and standby and automatic switch-on of main transformer and standby. Background technique [0002] With the development of economy and society, the requirements for the safe and stable operation of the power grid and the reliability of power supply for users are getting higher and higher, so the application of safety devices (that is, safety automatic devices) in substations is also becoming more and more extensive. Especially in large-scale urban power grids, due to the short electrical distance and excessive short-circuit current, the 220kV busbar of the 500kV substation adopts a special operation mode to control the short-circuit current, such as split operation or main transformer shutdown to limit the short-circuit current. At present, the 500kV substation The 220kV busbars of the ...

AI Technical Summary

Problems solved by technology

However, in the same substation, the main transformer standby automatic switching device and the 220kV bus tie standby automatic switching device have many similar requirements on hardware and external secondary circuits. repeated investment

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