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Power cable leakage detection device and method, and preparation method

A leakage detection and power cable technology, which is applied in the field of power systems, can solve problems such as low measurement accuracy, high voltage, and increased power consumption loss, and achieve the effects of strong anti-interference ability, simple production, and high sensitivity

Pending Publication Date: 2019-01-08
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cable leakage will cause the power supply terminal in the power system to raise the voltage, affect the normal use of electrical equipment, and increase the loss of power supply energy consumption
The non-contact detection method of capacitance, inductance, and current mutual inductance is the safest and most convenient technology at present, and has attracted the attention of the industry. However, most of them use solid deposited thin film electrodes as induction coils, and the measurement accuracy is low, which can no longer adapt to the narrow space. or high-density arrangement of cable equipment detection, in addition to the weak leakage point can not be measured

Method used

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  • Power cable leakage detection device and method, and preparation method
  • Power cable leakage detection device and method, and preparation method
  • Power cable leakage detection device and method, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A leakage detection device for power cables, which is arranged near the cable under test, comprising:

[0050] liquid metal microcoils, wires and voltage measuring devices;

[0051] The liquid metal microcoil is connected in series with the voltage measuring device through wires.

[0052] The number of the liquid metal micro-coils is one or more. When the number of the liquid metal micro-coils is multiple, the connection methods of the multiple liquid metal micro-coils include: series connection, parallel connection or series connection followed by parallel connection.

[0053] The liquid metal microcoil includes a microcoil flow channel and liquid metal;

[0054] The micro-coil flow channel is made of flexible and high-pressure resistant silicone rubber material;

[0055] The liquid metal is a metal alloy with a melting point in the range of 10-60°C.

[0056] The liquid metal microcoil includes:

[0057] Spiral and straight channel bent square.

[0058] The flexib...

Embodiment 2

[0061] The manufacturing method of the liquid metal coil comprises:

[0062] Using MEMS micromachining method to make microcoil flow channel mold;

[0063] pouring liquid silicone rubber on the microcoil runner mold, and peeling off from the mold after solidification;

[0064] The micro-coil flow channel is sealed by MEMS packaging technology;

[0065] The liquid metal is injected to fill the flow channel of the microcoil to form a complete microcoil.

[0066] The flexible high-pressure resistant silicone rubber material is polydimethylsiloxane.

[0067] The MEMS microfabrication method includes:

[0068] Soft etching and laser engraving.

[0069] The MEMS packaging process is plasma bonding.

Embodiment 3

[0071] A power cable leakage detection method, comprising:

[0072] Put the state metal microcoil parallel to the cable under test, and maintain a set distance from the cable under test, and move the microcoil in parallel along the direction of the cable according to the distance;

[0073] During the moving process, if the voltage detected by the voltage detection device in the power cable leakage detection device is higher than the preset maximum voltage value, it indicates that the leakage current of this part of the cable exceeds the maximum leakage current value, and maintenance is required.

[0074]According to the maximum leakage current value allowed by the normal operation of the cable, the sensor of the power cable leakage detection device is calibrated, and the corresponding maximum voltage value under the maximum leakage current condition is set on the voltage measurement device.

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Abstract

The invention provides a power cable leakage detection device, which is arranged near a detected cable and comprises a liquid metal micro coil, a wire and a voltage measuring device, wherein the liquid metal micro coil is connected to the voltage measuring device in series through the wire. According to the power cable leakage detection device provided by the invention, on-line and real-time fixed-point detection of a power cable leakage current situation can be realized, weak electric leakage can be measured, and a problem that weak electric leakage points cannot be measured is solved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a power cable leakage detection device, a preparation method and a leakage detection method. Background technique [0002] Cable is the most widely used equipment in power system, used for transmission and distribution of various voltage levels. [0003] In the power system, cables account for more than half of all kinds of electrical equipment failures or accidents, and more than 90% of cable failures or accidents caused by leakage current. Cable leakage will cause the power supply terminal in the power system to raise the voltage, affect the normal use of electrical equipment, and increase the loss of power supply energy consumption. The non-contact detection method of capacitance, inductance, and current mutual inductance is the safest and most convenient technology at present, and has attracted the attention of the industry. However, most of them use solid deposited thin film el...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/58
Inventor 郭屾王鹏栾文鹏张冀川
Owner CHINA ELECTRIC POWER RES INST