Double-bus line protection method and device of integrating voltage switching

Abstract

The invention discloses a double-bus line protection method and device of integrating voltage switching. The bus voltage of double buses directly enters a protection device sampling circuit; meanwhile, the position of a line knife switch is switched into the protection device as a switch-in quantity; an auxiliary contact of using the line knife switch directly enters the protection device for judgment of voltage switching; the protection device selects the bus voltage through logic judgment according to the position of the knife switch; and when the auxiliary contact of using the line knife switch is abnormal, the bus voltage can be selected by adopting a manually strong setting method. Through the design mode, the problem that false coordination can exist in the bus voltage is thoroughly solved; a special voltage switching device is omitted in line protection; the investment is reduced; meanwhile, connection of the protection device is simplified; and the reliability of the protection device is improved.

Description

technical field [0001] The invention relates to the field of double bus line protection, in particular to a double bus line protection method and device with integrated voltage switching function. Background technique [0002] At present, in order to solve the voltage selection problem of line protection, the line protection devices of double bus main wiring mode produced by various manufacturers in the market, the method adopted by the existing line protection devices is to use a special voltage switching device realized by a relay. see figure 2 and image 3 The schematic diagram of the relay wiring of the existing protection device circuit and the circuit diagram of the voltage switching device. This method has the following disadvantages: 1. A separate switching device is required, which increases the complexity of the wiring; 2. The knife switch auxiliary contact of the circuit for the device Once the auxiliary contact is abnormal, it may cause the two busbars to be mi...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to solve the voltage selection problem of line protection, the line protection devices of double bus main wiring mode produced by various manufacturers in the market, the method adopted by the existing line protection devices is to use a special voltage switching device realized by a relay. see figure 2 and image 3 The schematic diagram of the relay wiring of the existing protection device circuit and the circuit diagram of the voltage switching device. This method has the following disadvantages: 1. A separate switching device is required, which increases the complexity of the wiring; 2. The knife switch auxiliary contact of the circuit for the device Once the auxiliary contact is abnormal, it may cause the two busbars to be mistakenly paralleled or the voltage transformer to be reversely charged, thus causing electrical accidents such as protection malfunction, burning out of the voltage switching box, etc.

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