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On-site calibrating method and device of capacitor voltage transformer

A voltage transformer, field calibration technology, applied in the direction of measuring devices, instruments, measuring electrical variables, etc., can solve the problems of cumbersome, low efficiency, bulky, etc., to reduce the test voltage signal, reduce labor intensity, save test time Effect

Active Publication Date: 2009-10-14
RED PHASE INC
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Problems solved by technology

[0003] The purpose of the present invention is to solve the current situation that the existing capacitive voltage transformer on-site calibration equipment is bulky, heavy, and inefficient, and proposes a method and method for on-site calibration of capacitive voltage transformers that can significantly reduce the weight and volume of the calibration equipment. device

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  • On-site calibrating method and device of capacitor voltage transformer
  • On-site calibrating method and device of capacitor voltage transformer
  • On-site calibrating method and device of capacitor voltage transformer

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Embodiment Construction

[0029] like figure 1 shown, where C1 and C2 are capacitive voltage divider units, T is an electromagnetic unit, L K For the compensation reactor, a and n are metering windings, da and dn are protection windings, Z X is the damping unit, P1 is the high voltage terminal of the capacitive voltage transformer under test, N is the carrier terminal of the capacitive voltage transformer under test, and E is the low voltage terminal of the electromagnetic unit.

[0030] A method for on-site calibration of capacitive voltage transformers of the present invention mainly includes the following steps:

[0031] Step 1. The first signal processor 1 of the calibration device applies two AC test signals V not exceeding 3kV respectively between the high voltage terminal P1 of the capacitive unit and the low voltage terminal E of the electromagnetic unit of the capacitive voltage transformer under test. 1 1. V 1 2. The secondary side is open circuit;

[0032] Step 2. The second signal proce...

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Abstract

The invention relates to an on-site calibrating method and an on-site calibrating device of a capacitor voltage transformer. The invention directly measures voltage and current signals at the primary side and the secondary side of the measured capacitor voltage transformer and calculates the ratio and angular differences of the measured capacitor voltage transformer by utilizing the measured result, so that the invention can realize separately measuring the error of the measured capacitor voltage transformer only by the on-site calibrating device of the capacitor voltage transformer and does not need equipment such as a standard transformer, a voltage regulator, a voltage booster, a reactor and the like, thus saving calibrating time, lowering labor intensity of workers and resolving the difficulty of difficult implementation for error test of the on-site capacitor voltage transformer.

Description

technical field [0001] The invention relates to a method and device for on-site calibration of capacitive voltage transformers, which are mainly used for on-site error testing of capacitive voltage transformers for metering. Background technique [0002] The conventional on-site calibration of capacitive voltage transformers is mainly carried out by the comparison method, and the calibration equipment is mainly composed of standard voltage transformers, boost sources (devices) and load boxes. During on-site verification, use the boost source (device) to provide the test voltage to the primary winding of the standard transformer and the capacitive voltage transformer under test at the same time, and then take the output of the secondary winding of the standard voltage transformer as the true value, calculate or measure it. Output error of the secondary winding of the capacitive voltage transformer under test. The calibration equipment of the field calibration method is bulky...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 杨成理查德·道林陈耀高林玉涵
Owner RED PHASE INC
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