Method and device for measuring harmonic characteristics of current transformer

A technology of current transformer and harmonic characteristics, which is applied in the field of measurement of current transformer harmonic characteristics, can solve the problems of high difficulty and high cost, and achieve the effect of easy operation, good economy and simple measurement method

Active Publication Date: 2011-12-28
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology

The current transformer used to measure harmonics and the harmonic measurement characteristics inspection of the current sensor itself have always been a relatively difficult technical problem, mainly the production of a large current source containing harmonic components used for detection, that is, on a larger base The cost of synthesizing various harmonic currents with controllable amplitudes on the wave current is very high; secondly, the traceability method and measurement uncertainty evaluation of the harmonic current measurement system itself are technically difficult.

Method used

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  • Method and device for measuring harmonic characteristics of current transformer
  • Method and device for measuring harmonic characteristics of current transformer
  • Method and device for measuring harmonic characteristics of current transformer

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Embodiment Construction

[0027] Embodiments of the invention will be further described below in conjunction with the accompanying drawings:

[0028] as attached figure 1 As shown, it is an equal-ampere-turn composite circuit composed of three independent circuits, which are respectively the fundamental current circuit and the fundamental current l generated by the fundamental current source S 1 , another two harmonic current sources S of different frequencies 1 and S 2 , generate harmonic current loop l in their respective loops 2 , l 3 , the tested feedthrough current transformer or current transformer coil CT x Put it on the equal ampere-turn circuit. Each independent primary current loop is connected in series with a shunt (standard resistance R 1 ,R 2 ,R 3 ) is used to measure the primary current, the secondary output voltage of each shunt (U 1 , U 2 , U 3 ) as the standard quantity U corresponding to the primary equivalent ampere-turn synthetic current containing harmonic components n...

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Abstract

The invention relates to a method and an apparatus for measuring a harmonic characteristic of a current transformer. An equal ampere-turns method is employed as well as a primary loop fundamental wave current circuit and higher harmonic current circuits are formed by superposition and combination, so that harmonic characteristics of various current transformers or current sensors can be detected. Meanwhile, the method is also suitable for manufacturing a current source with high capacity equal ampere-turns harmonic standard and for tracing a source of a measuring system. According to the invention, with regard to detection on a harmonic characteristic of a current transformer or a current sensor, reliability and accuracy of calculation on high-capacity power harmonic electric energy can be improved and reliable bases are provided for equipment configuration and parameter selection of power harmonic treatment; in addition, the utilization of the method can be expanded to measuring field of transient characteristics of a high-capacity current transformer and a high-capacity current sensor.

Description

technical field [0001] The invention relates to a method and device for measuring harmonic characteristics of a current transformer, in particular to detecting the harmonic characteristics of a current transformer or a current sensor by an equal ampere-turn method, and belongs to the technical field of electrical instruments. Background technique [0002] With the increase of grid capacity, the primary current amplitude also increases significantly. The rated current of current transformers used in 220kV to 500kV grids has reached 3000A to 5000A, and the rated current of large-capacity generator sets is close to 30kA. Accurate measurement of harmonic currents in the power grid has an important impact on the selection of harmonic control technology solutions and the configuration of power grid equipment. The current transformer used to measure harmonics and the harmonic measurement characteristics inspection of the current sensor itself have always been a relatively difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00G01R35/02
Inventor 王晓琪冯宇陈晓明王欢李璿吴士普余春雨汪本进费晔王玲毛安澜陈心佳
Owner STATE GRID ELECTRIC POWER RES INST
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