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Method and device for measuring partial discharge signal intensity of high-voltage cable

A signal strength and discharge signal technology, applied in the field of electrical signal measurement, can solve the problems of uncertain grounding system inductance, induced current error, uncertain discharge time, etc., to avoid measurement errors, increase interference frequency, and improve accuracy. Effect

Pending Publication Date: 2021-04-02
ZHEJIANG DAYOU IND CO LTD HANGZHOU SCI TECH DEV BRANCH CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The induced current is the ratio of the discharge charge to the discharge time. Both the discharge charge and the discharge time are related to the inductance of the high-voltage cable grounding system. Due to the uncertain inductance of the grounding system, the discharge time is uncertain, which in turn leads to the measured induced current There are errors, resulting in low measurement accuracy

Method used

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  • Method and device for measuring partial discharge signal intensity of high-voltage cable
  • Method and device for measuring partial discharge signal intensity of high-voltage cable
  • Method and device for measuring partial discharge signal intensity of high-voltage cable

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Embodiment 1

[0050] Such as figure 1 As shown, the present invention proposes a method for measuring the partial discharge signal strength of a high-voltage cable, including:

[0051] S1: Obtain the induced voltage signal of the high voltage cable based on the preset time sequence.

[0052] The high-frequency current transformer (High Frequency Current Transformer, HFCT) is used to obtain the induced voltage signal of the high-voltage cable at a preset sampling frequency. HFCT is a sensor that collects high-frequency current by electromagnetic induction, and is widely used in transformers of various electrical levels. Partial discharge detection of high-voltage electrical equipment such as cables, switch cabinets, generators, PT cabinets, and circuit breakers.

[0053] HFCT is used to detect partial discharge signals inside the high-voltage cable body and cable joints. When partial discharge occurs in the cable, part of the current will flow into the ground through the outer shielding lay...

Embodiment 2

[0075] Such as image 3 As shown, the present invention also proposes a measuring device 6 of high-voltage cable partial discharge signal strength, comprising:

[0076] Acquisition unit 61: configured to acquire the induced voltage signal of the high voltage cable based on a preset time sequence.

[0077] The high-frequency current transformer (High Frequency Current Transformer, HFCT) is used to obtain the induced voltage signal of the high-voltage cable at a preset sampling frequency. HFCT is a sensor that collects high-frequency current by electromagnetic induction, and is widely used in transformers of various electrical levels. Partial discharge detection of high-voltage electrical equipment such as cables, switch cabinets, generators, PT cabinets, and circuit breakers.

[0078] The acquisition unit 61 uses HFCT to detect partial discharge signals inside the high-voltage cable body and cable joints. When partial discharge occurs in the cable, part of the current will flo...

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Abstract

The invention provides a method and device for measuring the partial discharge signal intensity of a high-voltage cable. The method comprises the steps of carrying out Fourier transform of on inducedvoltage signal, and obtaining the signal intensity of the induced voltage signal; comparing the signal intensity of each frequency with the signal intensity of the adjacent frequencies on the left andright sides, and if the signal intensity of the frequency is greater than the signal intensity of the adjacent frequencies on the two sides, taking the frequency as a characteristic frequency; judging whether a preset interval is reserved between the same characteristic frequency or not, and if so, taking the characteristic frequency as the discharge frequency of the discharge signal; and integrating the signal intensity of the partial discharge signal based on the discharge frequency to obtain the final signal intensity of the partial discharge signal. On the basis that the induced voltage signal is measured through a traditional measurement scheme, the signal intensity of partial discharge is calculated through Fourier transform and integration, measurement errors caused by inaccurate discharge time are avoided, and the accuracy of a measurement result is improved.

Description

technical field [0001] The invention belongs to the field of electric signal measurement, and in particular relates to a method and a device for measuring the partial discharge signal strength of a high-voltage cable. Background technique [0002] Partial discharge refers to the discharge phenomenon that occurs locally in the insulator of power equipment under the action of a sufficiently strong electric field. The initial stage of partial discharge does not affect the normal operation of cables and equipment. If the path penetrates the insulation, it will cause a safety accident. The traditional method for measuring the partial discharge intensity of high-voltage cables is to use a high-frequency current transformer (High Frequency Current Transformer, HFCT) to collect the induced current during partial discharge, and then calculate the signal intensity of partial discharge according to the induced current. [0003] The induced current is the ratio of the discharge charge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 吴靖钟剑朱建芳夏晓春徐祥海许杰张国连杨恬方炯毛炜王波何可人郑正仙王成珠贾晓刚
Owner ZHEJIANG DAYOU IND CO LTD HANGZHOU SCI TECH DEV BRANCH CO