Lightweight three-phase voltage and current generator

Abstract

The invention belongs to the technical field of power system relay protection, and particularly relates to a light-weight three-phase voltage and current generator. The light-weight three-phase voltage and current generator provided by the invention is small in size and light in weight, and is applied to a relay protection secondary loop. The light-weight three-phase voltage and current generator comprises a three-phase AC voltage forming circuit and a three-phase AC current forming circuit, and is characterized in that the three-phase AC voltage forming circuit comprises a switch K1, one end of the switch K1 is connected with a power supply input terminal, the other end of the switch K1 is connected with an input end of a self-coupling voltage regulator T2, an output end of the self-coupling voltage regulator T2 is connected with an input end of an isolation transformer T3, one end of an output end of the isolation transformer T3 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with one end of an adjustable resistor R6, one end of a resistor R11 and a voltage output terminal UA, and the other end of the adjustable resistor R6 is connected with one end of a resistor R7.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a light-duty three-phase voltage and current generator. Background technique [0002] At present, with the construction of a large number of smart substations, the protection sampling is carried out in the merging unit, and the places where the faults are added to the protection device by using the relay protection microcomputer tester are dispersed. The work place downstairs is moved around, which is laborious and time-consuming, seriously affecting work efficiency. [0003] In some occasions, especially when the 66KV smart substation is protected and debugged, it is only necessary to add a set of three-phase power frequency test current to test the protection fixed value or measured value. However, at the 10KV busbar where the secondary switch of the main transformer is located, the working locations are discrete, and it is necessary ...

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Problems solved by technology

[0002] At present, with the construction of a large number of smart substations, the protection sampling is carried out in the merging unit, and the places where the faults are added to the protection device by using the relay protection microcomputer tester are dispersed. The work place downstairs is moved around, which is labor-intensive and time-consuming, seriously affecting work efficiency

[0003] In some occasions, especially when the 66KV smart substation is protected and debugged, it is only necessary to add a set of three-phase power frequency test current to test the protection fixed value or measured value. However, at the 10KV busbar where the secondary switch of the main transformer is located, the working locations are discrete, and it is necessary to move the microcomputer protection tester weighing tens of kilograms to different locations, which is laborious, time-consuming and inefficient.

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