Multifunctional variable ratio electric bridge tester and testing method

Abstract

The invention discloses a multifunctional variable ratio electric bridge tester and a variable ratio electric bridge testing method. The tester comprises a variable ratio electric bridge, a plurality of capacitive voltage transformers, a multi-channel analogue / digital (A / D) converter and a central processing unit (CPU) chip, wherein the two ends of each voltage transformer are electrically connected with the multifunctional variable ratio electric bridge and the multi-channel A / D converter respectively; the multi-channel A / D converter is connected with the CPU chip through a data line; the multifunctional variable ratio electric bridge is provided with a panel; a plurality of lead sockets, a power socket, a high-voltage plug and a grounding plug of the voltage transformers and a liquid crystal touch display screen are arranged on the panel; the lead sockets are in point connection with the voltage transformers respectively; and the liquid display touch display screen is connected with the CPU chip. According to the variable ratio electric bridge testing method, time can be saved by two thirds, the operation time and the operation difficulty are reduced, and the working efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of variable voltage and high voltage detection equipment, in particular to a multifunctional variable ratio bridge tester and a test method. Background technique [0002] In the production process of semi-finished and finished products of power transformers, before the newly installed transformers are put into operation, according to the preventive test regulations of the Ministry of Electric Power, it is required to test the turns ratio or voltage ratio of the running transformers to check the transformer turns ratio. Correctness, the condition of the tap changer, whether the transformer is short-circuited between turns, and whether the transformer can be operated in parallel. At present, there are two methods for measuring the transformation ratio of transformers and transformers in the prior art: one is the electric bridge method, and the other is the transformer comparison method. The former adopts elec...

AI Technical Summary

Problems solved by technology

The voltage ratio measurement of the capacitive voltage transformer needs to measure the voltage ratio of the primary winding to the secondary winding. Now it can only measure one group and then change another group, which takes a long time. two-thirds of the time

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