Adaptive master variable, parent connection and connecting line stand-by dispensing device and realizing method

Abstract

The invention includes screen cabinet and current detection return circuit and control circuit set on the screen cabinet. Its technical key point: control circuit includes voltage detection return circuit; on-off closed return circuit; starting loop and backup power automatic switch control return circuit. The said current detection return circuit consists of ten loops at most. Each loop collects one current analog quantity, therein, two analog quantities are used for two main transformers to detect non-current latching; two analog quantities are used for representing the two main transformers overloading; the other analog quantities are used for reflecting less than six connecting lines overloading after outomatic switching. The realization of varies backup power automatic switching in arrangement is along with one change of system running mode to automatic change its automatic switching mode. It resolves the configuration problem of 220KV power substation backup power automatic switch device.

Description

(1) Technical field [0001] The invention relates to a main transformer, a bus coupler and a tie-line backup self-injection device of a 220KV and below substation in a power system. (2) Background technology [0002] Standby automatic switching devices are commonly used in substations below 66KV, but standby automatic switching devices suitable for 220KV substations have not been found. Judging from the current backup automatic switching devices produced by various manufacturers, they all use 66KV equipment to The 220KV substation is copied mechanically, ignoring the fact that the low-voltage side of the 220KV substation has double busbars, tie lines, and small power supplies. The normal operation is parallel operation, especially when encountering different faults and abnormal situations. The self-injection mode is single, once it is locked, all of them will be locked, there is no selectivity for the locking, tripping and connecting lines, the ones that should be closed are ...

AI Technical Summary

Problems solved by technology

[0002] Standby automatic switching devices are commonly used in substations below 66KV, but standby automatic switching devices suitable for 220KV substations have not been found. Judging from the current backup automatic switching devices produced by various manufacturers, they all use 66KV equipment to The 220KV substation is copied mechanically, ignoring the fact that the low-voltage side of the 220KV substation has double busbars, tie lines, and small power supplies. The normal operation is parallel operation, especially when encountering different faults and abnormal situations. The self-injection mode is single, once it is locked, all of them will be locked, there is no selectivity for the locking, tripping and connecting lines, the ones that should be closed are different, and the ones that should not be tripped will often cause undue power outages. In addition, because of the automatic switching device It is not specially designed for 220KV. Therefore, the backup automatic switching device is not only complex in structure, but also high in cost. At present, all power companies use microcomputer backup automatic switching, but the biggest disadvantage of computer protection is that sometimes program errors cause crashes, and its reliability It is greatly discounted, but the analog quantity of the self-injection device is not complicated, it is only a simple current and voltage, and no complicated calculation is required. When there is a problem in the protection of the microcomputer, the on-site commissioning personnel cannot deal with it in time, and have to wait for the manufacturer to come and repair it. Very inconvenient

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