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Device for measuring electric reactance of electric energy metering secondary circuit

A secondary circuit and electric energy metering technology, which is applied to the device for measuring the reactance of the secondary circuit of electric energy CT metering, and the field of devices for measuring the reactance of the secondary circuit of electric energy metering, can solve the problems that the reactance cannot be measured in real time online, and improve the working efficiency of the equipment , easy access and simple operation

Inactive Publication Date: 2017-05-24
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a device for measuring the reactance of the secondary circuit of electric energy metering, which solves the technical problem that the prior art cannot measure the reactance in the secondary circuit online in real time

Method used

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  • Device for measuring electric reactance of electric energy metering secondary circuit

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Embodiment 1

[0034]In this embodiment, the measured secondary circuit CT1, the measured secondary circuit wire, the electric energy meter and the junction box load 2, the first current transformer 3, the second current transformer 4, the waveform comparison module 10, the data processing module 11, The waveform comparison module 12 is composed of a sensing acquisition module 13 . Among them, the measured secondary circuit CT1 is connected with the electric energy meter and the junction box load 2 through the measured secondary circuit wire to form the measured electric energy measurement secondary circuit. The injection waveform module 12 is composed of a sine wave generating unit 5 , a current driving unit 6 and an injection waveform acquisition unit 8 ; the induction acquisition module 13 is composed of a signal conditioning unit 7 and an induction waveform acquisition unit 9 . The measured secondary circuit CT1 uses a low-voltage current transformer of the model LMZ3D, with an accuracy ...

Embodiment 2

[0043] In this embodiment, the measured secondary circuit CT1, the measured secondary circuit wire, the electric energy meter and the junction box load 2, the first current transformer 3, the second current transformer 4, the waveform comparison module 10, the data processing module 11, The waveform comparison module 12 is composed of a sensing acquisition module 13 . Among them, the measured secondary circuit CT1 is connected with the electric energy meter and the junction box load 2 through the measured secondary circuit wire to form the measured electric energy measurement secondary circuit. The injection waveform module 12 is composed of a sine wave generating unit 5 , a current driving unit 6 and an injection waveform acquisition unit 8 ; the induction acquisition module 13 is composed of a signal conditioning unit 7 and an induction waveform acquisition unit 9 . The measured secondary circuit CT1 uses a low-voltage current transformer of the model LMZ3D, with an accuracy...

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Abstract

The invention discloses a device for measuring the electric reactance of an electric energy metering secondary circuit and belongs to the field of power system measurement, which solves the problem that the electric reactance of a secondary circuit cannot be measured in real time in the online manner in the prior art. The device comprises an injection waveform module, a first current transformer, a second current transformer, an inductive acquisition module, a waveform comparison module and a data processing module. The first current transformer and the second current transformer obtain the response of the secondary circuit in the electromagnetic coupling manner. The injection waveform module and the inductive acquisition module convert the excitation and the response of the secondary circuit into voltage waveform signals, respectively. The waveform comparison module compares two paths of voltage waveform signals to obtain an amplitude value difference and a phase difference. The data processing module acquires the impedance of the electric energy metering secondary circuit according to the amplitude value difference and the phase difference, and then takes the imaginary part of the electric reactance to obtain the electric reactance of the electric energy metering secondary circuit. The device is particularly applicable to the detection of an electric energy CT metering secondary circuit and is wide in market prospect.

Description

technical field [0001] The invention relates to a device for measuring the reactance of a secondary circuit for electric energy metering, in particular to a device for measuring the reactance of a secondary circuit for electric energy CT metering, which belongs to the field of power system measurement. Background technique [0002] During the commissioning process of the new substation, if there is a problem with the secondary circuit of electric energy measurement in the substation, it will seriously affect the measurement of the whole substation equipment, and directly affect the remote monitoring and judgment of the substation equipment. At the same time, problems in the secondary circuit will cause malfunction or refusal of the protection device, seriously endangering the safe operation of the power grid, which is a weak link in the relay protection work. [0003] Current transformer, referred to as CT, is the contact element between the primary side (input side) and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 刘俊杰周峰姜春阳王斌武殷小东项琼刘浩岳长喜
Owner CHINA ELECTRIC POWER RES INST