Voltage or current transformer on-line test device and voltage or current transformer on-line test method

Abstract

The invention discloses a test device, aims to provide a voltage or current transformer on-line test device without current interruption, a test power source and a standard voltage or current transformer and further discloses a voltage or current transformer on-line test method which is simple to test and operate and flexible in test. The device comprises a CPU (central processing unit) (8), a signal generator (1), an A / D (analog to digital) converter (7), a display module (9), an input interface circuit (2) and a sampling circuit (6), wherein the signal generator (1), the A / D converter (7) and the display module (9) are electrically connected with the CPU (8), the input interface circuit (2) is electrically connected with the signal generator (1) and is electrically connected onto a primary loop (3) on one side of a tested transformer (4), and the sampling circuit (6) is electrically connected with the A / D converter (7) and is electrically connected onto a secondary loop (5) on the other side of the tested transformer (4). Therefore, a loop for on-line test of the tested transformer (4) is formed.

Description

technical field [0001] The invention relates to an on-line testing device for a voltage or current transformer, and also relates to an on-line testing method for a voltage or current transformer. Background technique [0002] Voltage or current transformers are mainly used for voltage conversion and current conversion, and are widely used in power distribution networks and various application circuits. Voltage or current transformers need periodic technical verification and testing during daily use to ensure that their accuracy meets the requirements. According to the relevant national verification regulations, voltage or current transformers are generally tested or verified when the power is cut off, and the main test and verification item is the error test. Under the existing technology, people usually adopt such as figure 1 The device shown is for error testing. It is mainly composed of test power supply, standard voltage or current transformer, tested transformer, erro...

AI Technical Summary

Problems solved by technology

[0003] (1) The circuit where the transformer under test is located must be powered off during the test, and failure to work after power off will affect and restrict the working efficiency of related circuits;

[0004] (2) There must be a standard voltage or current transformer. Once there is an error in the standard voltage or current transformer itself, it will cause a large error in the final test result;

[0005] (3) It must be equipped with a test power supply and a voltage and current load box, which not only wastes energy, but also increases the test cost;

[0006] (4) In order to obtain a more accurate error test, the test must be repeated. The test process is complicated, the cycle is long, the test is not flexible, and it cannot be tested in real time

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