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Pre-embedded sensor for local discharge detection of power cable accessory

A partial discharge detection and power cable technology, applied in the direction of testing dielectric strength, etc., can solve the problems of narrow detection frequency band, poor sensitivity and anti-interference ability, application limitations, etc., and achieve the effect of high sensitivity and strong anti-interference ability.

Active Publication Date: 2011-06-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

Compared with the built-in sensor, the detection frequency band of the external electromagnetic coupling method is narrow, and the sensor is installed outside the cable accessories, which is easily affected by field interference, and has poor sensitivity and anti-interference ability
However, due to the aforementioned semi-conductive insulation and metal shielding structure inside the cable accessories, it is difficult for the signal generated by partial discharge to reach the corresponding sensor. , the effect of practical application is not very ideal, resulting in the application of partial discharge in the insulation diagnosis of power cable accessories is also limited

Method used

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  • Pre-embedded sensor for local discharge detection of power cable accessory
  • Pre-embedded sensor for local discharge detection of power cable accessory

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Embodiment Construction

[0015] see figure 1 As shown, the present invention is composed of buffer layer 1 , ring electrode 2 , connecting cable 3 , lead terminal 4 , and signal conditioning unit 5 .

[0016] The buffer layer 1 surrounds the outer side of the power cable accessory insulation 7, and the inner side of the power cable accessory insulation 7 is not in direct contact with the semiconducting layer.

[0017] The ring electrode 2 surrounds the outer side of the buffer layer 1 and will not have adverse effects on the electric field distribution and insulation at the installation place.

[0018] The connection cable 3 is connected to the ring electrode 2 through an impedance matching unit 31 for connecting the ring electrode 2 and the lead-out terminal 4 .

[0019] The lead-out terminal 4 is fixedly connected to the opening on the power cable accessory housing 6 by welding.

[0020] The lead-out terminal 4 is connected to a signal conditioning unit 5 .

[0021] The signal conditioning unit 5...

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Abstract

The invention discloses a pre-embedded sensor for the local discharge detection of a power cable accessory, which comprises a buffer layer, an annular electrode, a connecting cable, a lead-out terminal and a signal conditioning unit. The invention integrates the advantages of an internal capacitance coupling method and an external electromagnetic coupling method and provides an embedded sensor for the local discharge detection of a power cable accessory, which has the advantages of strong anti-jamming capability and high sensitivity as well as dual characteristics of capacitance coupling and electromagnetic coupling.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment insulation detection, and in particular relates to a pre-embedded sensor applied to partial discharge detection of power cable accessories. Background technique [0002] Power cables are one of the important components that constitute the power system network. Compared with overhead lines, power cables are widely used in transmission lines and distribution networks of various voltage levels in power systems due to their superior electrical properties, good thermal and mechanical effects, and convenient installation and maintenance. However, after the power cable is put into operation, due to the long-term erosion and penetration of moisture, moisture and various corrosive substances, and the latent defects formed during manufacturing or installation, it will still cause failure and gradually expand, often leading to major accidents. . Power cable accessories, such as intermediate jo...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 李成榕齐波陈沛云刘延卓张立刚常文治
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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