Charged test method for current transformer and application thereof

Abstract

The invention discloses a charged test method for a current transformer and application thereof. The method comprises the following steps of: serially connecting a charged analyzer with a secondary low-voltage loop to serve as a test loop through two switches of a secondary terminal box on a secondary side loop of the current transformer under the condition of operating the charged current transformer; injecting a different-frequency test signal generated by the analyzer into the test loop through the analyzer, and realizing a charged error test and a charged frequency response test by measuring and calculating loop key parameters under an injected frequency signal; and changing a method for secondary load impedance to change excitation conditions through the analyzer, and measuring load change influence to test a charged exciting characteristic curve. Compared with the prior art, the method has the advantages that: the charged test of the current transformer can be performed without contact of primary voltage, an upward current source, a standard transformer or a load box, the safety and reliability of an uninterrupted power test are guaranteed, the equipment is high in integration, portable and light, and the method is favorable for on-site and laboratory tests and long-term online monitoring.

Description

technical field [0001] The invention relates to a detection method of a current transformer, in particular to a live test method of a current transformer and its application. Background technique [0002] Existing electromagnetic current transformer error calibration, excitation characteristic test, etc. mainly rely on periodic power failure test, not only the detection cycle is long, but also because the current transformer runs without power for a long time, once the current transformer fails or the error is out of tolerance, it will Brewing major billing or power outage losses, severe cases may also threaten other power equipment and affect power production. [0003] Although there are currently devices on the market that can be used to detect the error of electromagnetic current transformers when they are live, operators need to be exposed to high voltage (up to 1000kV) once, and they need to carry a large number of equipment such as current boosting sources, standard tr...

AI Technical Summary

Problems solved by technology

[0002] The existing electromagnetic current transformer error calibration and excitation characteristic test mainly rely on periodic power failure test, not only the detection cycle is long, but also because the current transformer operates without power for a long time, once the current transformer fails or the error is out of tolerance, it will Brewing major billing or power outage losses, severe cases may also threaten other power equipment and affect power production

[0003] Although there are currently devices on the market that can be used to detect the error of electromagnetic current transformers while live, the operator needs to be exposed to a high voltage (up to 1000kV) once, and needs to carry a large number of devices such as current boosting sources, standard transformers and external load boxes. , so there are defects of high risk and low feasibility

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