Novel phase sequence meter test device

Abstract

The invention relates to a novel phase sequence meter test device comprising a phase sequence generator, a zero line terminal N, a three-phase terminal L1, a three-phase terminal L2, a three-phase terminal L3, a delay switch SJ1, an intermediate relay ZJ, a positive sequence button SA, a normally-open contact KM1.1, an AC contactor KM1, a normally-closed contact KM2.2, a negative sequence button NA, a normally-open contact KM2.1, an AC contactor KM2, a normally-closed contact KM1.2, a control switch ZA, a normally-open contact KM1.5, a normally-open contact KM2.5, a time relay SJ, a normally-open contact KM1.3, a normally-open contact KM2.3, a positive sequence indicating lamp HR, a negative sequence indicating lamp HG, a stop button TA, a normally-closed contact ZJ1, a normally-closed contact ZJ2, normally-open contacts KM3.1-3.3 and normally-open contact KM4.1-4.3.

Description

technical field [0001] The invention relates to the field of electric power technology, and more specifically, relates to a novel phase sequence meter testing device. Background technique [0002] The internal structure of a general phase sequence meter is similar to a three-phase AC motor, with three-phase AC windings and a very light rotor, which can rotate under a small torque, and the operating voltage range of the three-phase AC windings is very wide, from tens of volts to Five hundred volts can work. When testing, determine the phase sequence according to the rotation direction of the rotor. There is also a phase sequence meter that determines the phase sequence through a resistance-capacitance phase-shifting circuit, and there are different signal lights to display the phase sequence in different phase sequences. [0003] When the early electrical testers tested the phase sequence table in the laboratory, the method used was to lead out the A, B, and C three-phase p...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a new type of phase sequence meter testing device in order to solve the technical defects that the power supply is easy to short-circuit and easily cause personal electric shock accidents due to the need for repeated wiring when testing the phase sequence meter in the prior art.

Images