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Partial discharge detection module of cable intermediate joint distributed online monitoring device

A technology for cable intermediate joints and partial discharge detection, which is applied in the direction of measuring devices, measuring circuits, and testing circuits, and can solve problems such as partial discharge, limited measurement sensitivity, and joint breakdown

Pending Publication Date: 2020-10-23
XUCHANG SIDA ELECTRIC POWER EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor laying environment during the on-site construction process and the uneven technical level of the operators, the intermediate joints of the distribution cables are prone to defects during the production process, resulting in partial discharges, which in turn lead to joint breakdowns and power outages.
Cable partial discharge on-line monitoring technology often uses high-frequency current transformers to monitor the partial discharge pulse current signal on the cable grounding line at the grounding point of the cable terminal. Due to the attenuation of the partial discharge signal during cable transmission, the sensor can only be installed at the cable terminal Limits the measurement sensitivity of cable partial discharge on-line monitoring and is not suitable for long-distance cables
On-line monitoring technology is mostly limited by the lack of reliable power supply along the cable, so the sensor can only be installed at the cable terminal or a few places with stable power supply

Method used

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  • Partial discharge detection module of cable intermediate joint distributed online monitoring device
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  • Partial discharge detection module of cable intermediate joint distributed online monitoring device

Examples

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Embodiment 1

[0024] The partial discharge detection module of the distributed on-line monitoring device of the cable intermediate joint, the module is arranged on the intermediate joint of the distribution cable, and includes a partial discharge monitoring unit 11, an energy acquisition unit 12, a signal conditioning unit 13, a data processing unit 14, an energy storage unit The power supply unit 15 and the data transmission unit 16 are composed; the partial discharge monitoring unit 11 includes a double-loop antenna and a detection circuit, and the double-loop antenna includes an inner antenna 21, an outer antenna 23 and an ABS filling layer 22 between the two, and the inner antenna 21 and the outer antenna 23 are made of copper foil bent into a ring, and the inner antenna 21 is closely attached to the outer sheath of the cable intermediate joint; the detection circuit is composed of a capacitor C1, a resistor R1 and a BNC output port, and the capacitor C1 It is connected with the outer an...

Embodiment 2

[0036] The application of the partial discharge detection module of the present invention in the distributed full-state on-line monitoring device of the intermediate joint of the distribution cable: the use method can be divided into three parts: data transmission, state monitoring and energy supply and power supply for description:

[0037] 1. Data transmission

[0038] The n distributed partial discharge detection modules are respectively numbered as 1, 2, 3...n according to the distance from the host unit, the number with the smallest distance is 1, and the number with the largest distance is n. When uploading data to the cloud server, the nth partial discharge detection module transmits the data to the n-1 module based on the Lora transmission protocol. The monitoring data of the No. module is integrated and sent to the No. n-2 module, and so on. Finally, the No. 1 module integrates the monitoring data of all n modules and sends it to the host unit. After the host unit re...

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Abstract

The invention relates to a partial discharge detection module of a cable intermediate joint distributed online monitoring device. The module is arranged on a power distribution cable intermediate joint and comprises a partial discharge monitoring unit, an energy taking unit, a signal conditioning unit, a data processing unit, an energy storage power supply unit and a data transmission unit; the partial discharge monitoring unit acquires a partial discharge signal and then transmits the signal to the signal conditioning unit, the signal conditioning unit filters and amplifies partial dischargesignals and then transmits the partial discharge signals to the data processing unit, the data processing unit converts measured analog waveforms into binary data and transmits the binary data to thedata transmission unit, and the data transmission unit performs data transmission with an adjacent detection module in a wireless transmission mode. Electromagnetic waves generated by partial discharge can induce corresponding voltage waveforms on a double-loop antenna, non-invasive measurement of partial discharge signals of the power distribution cable intermediate joint is realized, and the sensitivity of partial discharge measurement is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of partial discharge detection of power distribution cables, in particular to a partial discharge detection module of a distributed on-line monitoring device for intermediate joints of cables. Background technique [0002] With the gradual deepening of the transformation of overhead cables into the ground in our country, power cables have become the main force of power transmission in cities in my country due to their beautiful appearance, strong safety, and small space occupancy. Stable operation is directly related. However, due to the poor laying environment and the uneven technical level of the operators during the on-site construction process, the intermediate joints of the distribution cables are prone to defects during the production process, resulting in partial discharges, which in turn lead to joint breakdowns and power outages. Cable partial discharge on-line monitoring technology often uses high-...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/14G08C17/02
CPCG01R31/1272G01R31/14G08C17/02
Inventor 姜兴昌陈瑞斌陈四甫卢雨欣颜源李洪杰杨扬张明磊
Owner XUCHANG SIDA ELECTRIC POWER EQUIP
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