CN-121995164-A - Flexible sensor array based on transient ground voltage

CN121995164ACN 121995164 ACN121995164 ACN 121995164ACN-121995164-A

Abstract

The invention discloses a flexible sensor array based on transient ground voltage, which comprises a shell, a plurality of sensor units, a signal cable, a signal processing module and a wireless communication module, wherein the shell is made of flexible polymer materials and is suitable for a curved surface structure of the surface of a cable terminal, the sensor units are arranged on the surface of the shell at intervals and detect TEV signals of the surface of the cable terminal in a capacitive coupling mode, one end of the signal cable is electrically connected with the sensor units on the shell, and the other end of the signal cable is connected with the signal processing module and the wireless communication module at the rear end to realize real-time transmission and remote monitoring of partial discharge signals. According to the invention, the sensor array is prepared from the flexible polymer material, so that the sensor can be closely attached to the semi-conductive curved surface of the cable terminal, and the high-efficiency, low-cost, stable and real-time online partial discharge monitoring of the cable terminal is realized, thereby improving the safety and reliability of a power system.

Inventors

LI WEIFENG
LIN GUOFANG
LU ZEMU
YANG TING
NIU HENG
XU RUOLAN
LUO XUN
TANG QINGBIN
XU HONGJIAN
LIU CHENYANG

Assignees

福建和盛高科技产业有限公司

Dates

Publication Date: 20260508
Application Date: 20251231

Claims (8)

1. A flexible sensor array based on transient ground voltage is used for on-line monitoring of partial discharge of a cable terminal and is characterized in that the flexible sensor array comprises: a housing made of a flexible polymeric material having a curved configuration adapted to a surface of a cable termination; the sensor units are arranged on the surface of the shell at intervals and detect TEV signals on the surface of the cable terminal in a capacitive coupling mode; And one end of the signal cable is electrically connected with the sensor unit on the shell, and the other end of the signal cable is connected with the signal processing module and the wireless communication module at the rear end, so that the real-time transmission and the remote monitoring of partial discharge signals are realized.
2. A flexible sensor array based on transient ground voltage according to claim 1 wherein the curved surface structure is a ring structure with openings.
3. The flexible sensor array based on transient ground voltage according to claim 1, wherein each sensor unit is of a dual-capacitor serial sensor structure, each sensor unit comprises an output electrode, an intermediate layer and a ground electrode which are sequentially stacked in a sealed insulating package, the output electrode, the intermediate layer and the ground electrode are arranged from near to far according to the distance from the surface of a cable terminal, a self-capacitor is formed between the output electrode and the ground electrode, an interaction volume is formed between the output electrode and the surface of the cable terminal, and the output electrode and the ground electrode extend out of the sealed insulating package through an outgoing signal wire.
4. A flexible sensor array based on transient ground voltage according to claim 3 wherein the sealed insulating enclosure is a plastic film.
5. The flexible sensor array of claim 1, wherein the plurality of sensor units are arranged in an array to cover different portions of the cable termination surface to improve detection coverage and sensitivity.
6. A flexible sensor array based on transient ground voltage as recited in claim 1, wherein four of the sensor units are uniformly distributed on an inner side of the housing proximate the cable termination surface.
7. The flexible sensor array of claim 1, wherein the wireless communication module is a 4G or 5G communication module with high-speed data transmission and anti-interference protocols, and is used for uploading the monitoring data to the remote monitoring platform in real time.
8. A flexible sensor array based on transient ground voltage of claim 7 wherein the remote monitoring platform is integrated with artificial intelligence and/or machine learning algorithms to analyze partial discharge data, predict fault types, and estimate remaining life of the device under test.

Description

Flexible sensor array based on transient ground voltage Technical Field The invention relates to the technical field of electrical equipment, in particular to a flexible sensor array based on transient ground voltage. Background Cable systems are one of the most important, complex infrastructures in power systems, the safe operation of which is directly related to the reliability and the quality of the power supply. In cable systems, cable terminations are used for connecting medium-high voltage cables with electrical equipment, which are very prone to insulation defects due to long-term environmental, mechanical and electrical stresses. These defects induce partial discharge under the action of strong electric field and non-uniform electric field, and if they cannot be found in time, they will cause insulation degradation, equipment failure, and even large-scale power failure, resulting in high maintenance cost and serious power interruption. Therefore, there is an urgent need for a partial discharge on-line monitoring technology that is low in cost, high in sensitivity, easy to install and suitable for a curved surface structure of a cable terminal, so as to solve the defects of the existing method in cable terminal detection. Disclosure of Invention The invention aims to overcome the defects in the existing partial discharge monitoring method, provides a flexible sensor array based on transient ground voltage, can effectively solve the problems of adaptability, sensitivity, cost, interference, installation and the like in the partial discharge detection of a cable terminal, and realizes the efficient, low-cost, stable and real-time online partial discharge monitoring of the cable terminal, thereby improving the safety and reliability of a power system. The technical scheme adopted by the invention is as follows: a flexible sensor array based on transient ground voltage for cable termination partial discharge on-line monitoring, the flexible sensor array comprising: a housing made of a flexible polymeric material having a curved configuration adapted to a surface of a cable termination; the sensor units are arranged on the surface of the shell at intervals and detect TEV signals on the surface of the cable terminal in a capacitive coupling mode; And one end of the signal cable is electrically connected with the sensor unit on the shell, and the other end of the signal cable is connected with the signal processing module and the wireless communication module at the rear end, so that the real-time transmission and the remote monitoring of partial discharge signals are realized. Further, the curved surface structure is an annular structure with an opening. Further, each sensor unit adopts a double-capacitance serial sensor structure, each sensor unit comprises an output electrode, an intermediate layer and a grounding electrode which are sequentially stacked in a sealed insulating inclusion, the output electrode, the intermediate layer and the grounding electrode are arranged from near to far according to the distance between the output electrode and the surface of a cable terminal, self capacitance is formed between the output electrode and the grounding electrode, an air gap between the output electrode and the surface of the cable terminal forms an interactive capacitance, and the output electrode and the grounding electrode extend out of the sealed insulating inclusion through a lead-out signal wire. Further, the sealed insulating package is a plastic film. Further, the plurality of sensor units are arranged in an array mode and cover different parts of the surface of the cable terminal, so that the detection coverage range and the sensitivity are improved. Further, four of the sensor units are uniformly distributed on the inner side surface of the shell, which is close to the terminal surface of the cable. Further, the wireless communication module adopts a 4G or 5G communication module with high-speed data transmission and anti-interference protocol, and is used for uploading the monitoring data to the remote monitoring platform in real time. Further, the remote monitoring platform is integrated with artificial intelligence and/or machine learning algorithms to analyze partial discharge data, predict fault types, and estimate the remaining life of the device under test. The technical scheme adopted by the invention has the beneficial effects that 1) the detection adaptability and sensitivity to the curved surface structure of the cable terminal are obviously improved, and the traditional TEV sensor is based on a rigid structure, is difficult to attach to a semi-conductive curved surface, and has low signal capturing efficiency. The invention adopts a flexible polymer material and a double-capacitor structure, so that the sensor array can be closely attached to the curved surface of the cable terminal, and the effective coupling area is increased. Through simulation and actual measurement verification,