Three-phase program control test power supply circuit for passive secondary circuit

Abstract

The invention discloses a three-phase program control test power supply circuit for a passive secondary loop. Thethree-phase program control test power supply circuit comprises an output transformer circuit, an output electric parameter detection circuit, a digital power amplifier circuit, a D / A conversion circuit, a master control MCU circuit, a wireless communication circuit, a lithium battery power supply management circuit, a protection circuit and a man-machine interaction circuit; the output transformer circuit comprises an output transformer and three current-limiting resistors; and three-phase input signals UA, UB and UC of the output transformer circuit are electrically connected with the output end of the digital power amplifier circuit. According to the invention, wiring inspection is carried out on primary and secondary side loops of a metering loop when a bus is in an uncharged state, a three-phase test program control source is required to be equipped with a battery pack, three-phase adjustable voltage and current signals with phases can be output, enough amplitude and power are provided to meet post-stage detection requirements, and the three-phase program control test power supply circuit has the advantages of miniaturization, portability, convenient storage and on-site operation.

Description

technical field [0001] The invention relates to the technical field of electrical measurement, in particular to a three-phase program-controlled test power supply circuit for a passive secondary circuit. Background technique [0002] At present, the installation of PT, CT, electric energy meter, collection terminal and joint junction box in the high and low voltage metering cabinet is a routine work for the high and low voltage electric energy metering installation business, but the existing user side metering cabinet, especially the medium and The installation and commissioning mode of the metering secondary circuit of the low-voltage user is still relatively backward; since the user is usually in a state of no load and no power supply after the installation operation is completed, it is impossible to judge whether the installation of the metering circuit is correct, which is often caused by human factors and irregular operations. The wrong wiring of the metering secondary ...

AI Technical Summary

Problems solved by technology

[0002] At present, the installation of PT, CT, electric energy meter, collection terminal and joint junction box in the high and low voltage metering cabinet is a routine work for the high and low voltage electric energy metering installation business, but the existing user side metering cabinet, especially the medium and The installation and commissioning mode of the metering secondary circuit of the low-voltage user is still relatively backward; since the user is usually in a state of no load and no power supply after the installation operation is completed, it is impossible to judge whether the installation of the metering circuit is correct, which is often caused by human factors and irregular operations. The wiring of the metering secondary circuit is wrong, causing unnecessary losses and disputes to the power grid and customers

[0003] At present, the existing three-phase program-controlled power supplies in the market are generally bulky and heavy, without an internal battery pack, and cannot work without an external power supply. The cost is high and the operation is complicated.

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