CN-121995137-A - Inner wall embedded type multidimensional state monitoring system for GIS transformer

CN121995137ACN 121995137 ACN121995137 ACN 121995137ACN-121995137-A

Abstract

The invention provides an inner wall embedded multi-dimensional state monitoring system for a GIS transformer, which comprises a transformer shell integrated with a comprehensive information management system, a temperature difference heating module for providing direct current for a multi-source synthetic energy management module, a piezoelectric module for rectifying, boosting and storing energy through the energy management system of the multi-source synthetic energy management module, an ultrasonic partial discharge detection sensor, a temperature sensor, an SF 6 degradation gas metal oxide semiconductor sensor, a main control module for processing acquired signals and a communication module, wherein the ultrasonic partial discharge detection sensor is deposited on the inner wall of the transformer shell. The invention realizes synchronous acquisition of four-dimensional information of electric-acoustic-thermal-chemical inside the GIS transformer, all sensors are deposited on the inner wall of the transformer to improve the accuracy and confidence of diagnosis, and the vibration-heat energy comprehensive energy supply system solves the problem of stable energy supply of the internal sensors and provides a feasible scheme for intelligent monitoring of the whole life cycle of equipment.

Inventors

ZHOU YUCHI
SHI JIANPING
ZHANG WENJIE
ZHU WENCHEN

Assignees

南京师范大学

Dates

Publication Date: 20260508
Application Date: 20260113

Claims (10)

1. The embedded multidimensional state monitoring system for the inner wall of the GIS transformer is characterized by comprising a transformer shell and a comprehensive information management system, wherein the transformer shell is integrated with the comprehensive information management system; The temperature difference heating module is arranged between the iron core of the GIS transformer and the transformer shell and is used for providing direct current for the multi-source synthetic energy management module; The piezoelectric module is arranged in the middle of the transformer shell and is used for rectifying, boosting and storing energy through an energy management system of the multi-source synthetic energy management module; an ultrasonic partial discharge detection sensor, a temperature sensor and an SF 6 degradation gas metal oxide semiconductor sensor which are deposited on the inner wall of the transformer shell; The main control module is used for processing signals acquired by the ultrasonic partial discharge detection sensor, the temperature sensor and the SF 6 degradation gas metal oxide semiconductor sensor; And the communication module is used for transmitting the signals processed by the main control module to an external information platform through the ceramic insulator window.
2. The embedded multidimensional state monitoring system for the inner wall of the GIS transformer according to claim 1, wherein the thermoelectric heating module comprises a hot-face electric insulation ceramic serving as a hot end of the module, a cold-face electric insulation ceramic serving as a cold end of the module and a thermocouple pair, the hot-face electric insulation ceramic and the cold-face electric insulation ceramic are oppositely arranged and are used for packaging the thermocouple pair, at least one pair of the thermocouple pair comprises a P-type semiconductor and an N-type semiconductor, the P-type semiconductor and the N-type semiconductor are electrically connected at the hot end through a copper conductor to form a galvanic couple, adjacent thermocouple pairs are electrically connected in series at the cold end through a copper conductor to form a series circuit, and the series circuit is further provided with an anode and a cathode for connecting the multisource synthetic energy management module.
3. The system of claim 1, wherein the multi-source composite energy management module comprises an electrical connection current/voltage detection circuit module, a state identification module, an energy management circuit, a strain gauge voltage acquisition circuit and a thermoelectric generation acquisition circuit, and the energy management circuit comprises an impedance matching circuit, a rectifying and filtering circuit, a boost circuit and a super capacitor.
4. The system of claim 1, wherein the piezoelectric module is a cantilever type piezoelectric structure, a base portion of the piezoelectric module is fixed on the inner wall of the transformer housing, the transformer is conducted to vibrate, a weight is connected to the lower end of the cantilever, and electric energy is generated through periodic deformation of two sides of the cantilever under the influence of the weight.
5. The system of claim 1, wherein the main control module comprises an ARM processor, a signal conditioning circuit, a high-speed AD conversion circuit, a high-speed algorithm module, a synchronization module, and a storage module, which are electrically connected.
6. The system of claim 1, wherein the communication module comprises a GPRS wireless communication module, encapsulates data transmitted by a lower computer into GPRS packet data packets, and implements conversion between TCP/IP protocol and serial communication protocol.
7. The system for monitoring the embedded multidimensional state of the inner wall of the GIS transformer according to claim 1, wherein the ultrasonic partial discharge detection sensor, the temperature sensor and the SF 6 degradation gas metal oxide semiconductor sensor are all provided with insulating protection layers, and the temperature difference heating module, the multisource synthesis energy management module, the main control module and the communication module are embedded in the inner wall of the transformer shell and are subjected to electromagnetic compatibility design so as to inhibit electromagnetic interference.
8. The embedded multi-dimensional status monitoring system of claim 7, wherein the ultrasonic partial discharge detection sensor is fabricated using a flexible process, wherein a polyimide film is deposited on the inner wall of the transformer housing as a substrate, and wherein copper wires are deposited on the substrate by an aerosol process.
9. The embedded multidimensional state monitoring system for the inner wall of the GIS transformer according to claim 7, wherein the temperature sensor is of a serpentine structure, polyimide is used as a flexible substrate, and a metal nickel film is deposited on the surface of the flexible substrate through an aerosol process and is subjected to strain resistance design.
10. The system for monitoring the embedded multidimensional state of the inner wall of the GIS transformer according to claim 7, wherein the surface of the interdigital electrode of the SF 6 degradation gas metal oxide semiconductor sensor comprises a gas sensitive layer, and the gas sensitive layer is formed by uniformly dispersing carbon nano tubes on the surface of the interdigital electrode through an aerosol process.

Description

Inner wall embedded type multidimensional state monitoring system for GIS transformer Technical Field The invention belongs to the technical field of intelligent power grid monitoring, and particularly relates to an inner wall embedded type multidimensional state monitoring system for a GIS transformer. Background In order to meet the development trend of the integration of the energy revolution and the digital revolution, the power grid is accelerating to evolve towards the energy internet. The electric power internet of things is a basis and a carrier for digitalization, networking and intellectualization of the energy internet, and promotes comprehensive perception and ubiquitous interconnection of a power grid. However, in the context of the rapid development of smart grids, the accuracy and reliability of state sensing of the power internet of things face a great challenge, especially in terms of power supply and monitoring accuracy of large-scale transformer monitoring sensors. The existing large-scale transformer sensor is powered by direct power supply access and electromagnetic induction. The direct power supply access mode depends on an external power supply, increases operation and maintenance cost and complexity, is easily influenced by external factors such as power grid faults and the like, is limited by the current magnitude and the magnetic field distribution of the transformer, and is difficult to ensure in power supply reliability when the current is smaller or the magnetic field distribution is uneven. The invention adopts vibration energy and heat difference energy supply, fully utilizes the extra loss of the transformer, and is stable and reliable. The existing transformer monitoring technology is mostly dependent on an external or single-type sensor, and external monitoring signals have the problems of response lag, information isolation and the like due to the shielding and attenuation effects of a transformer shell. The parameters are independently collected and independently analyzed, and effective synergy and fusion are lacked. The power operation and maintenance personnel need to synthesize scattered information which comes from different systems and is not synchronous in time and space to carry out manual judgment, the efficiency is low, and unified and accurate assessment conclusion on the whole health state of equipment is difficult to form. The technical scheme of this patent is this technical scheme belongs to smart power grids monitoring technology field, and the multidimensional, real-time, the embedded monitoring demand of the inside state of special GIS transformer is aimed at. In the prior art, an external or independent sensor is mostly adopted for state monitoring of a large-sized transformer, and the problems of strong power supply dependency, signal lag, information isolation and the like exist. In the prior art, although the schemes related to vibration power generation, temperature difference power generation or partial discharge monitoring exist, most of the schemes are single-function or external design, and the schemes lack of multi-dimensional information fusion, embedded power supply and sensing integration. Through searching, the utility model patent with publication number CN209132374U discloses an ultrahigh frequency partial discharge and SF6 gas density integrated on-line monitoring system, which comprises a plurality of integrated sensor modules, an on-line monitoring host, a coaxial cable, a monitoring host antenna and an integrated sensor module antenna. Wherein, the ultrahigh frequency, SF6 gas pressure and temperature sensors of the integrated sensor module are all cast on one flange by epoxy resin. The on-line monitoring host and the integrated sensor are both provided with antennas and are used for transmitting SF6 gas density and temperature data, the on-line monitoring host provides power for the integrated sensor through the coaxial cable, and meanwhile, the ultra-high frequency partial discharge signals are obtained through the coaxial cable. The invention patent with the publication number of CN111024156B discloses a multi-sensor integrated monitoring device for GIS information acquisition, which comprises a GIS information comprehensive acquisition sub-device and a GIS state diagnosis sub-device which are connected, wherein the GIS information comprehensive acquisition sub-device comprises a shell, and a GIS information acquisition module, an information processing module and an environment data acquisition module which are arranged in the shell, the information processing module is respectively connected with the GIS information acquisition module and the environment data acquisition module, a fixing mechanism for installing the GIS information comprehensive acquisition sub-device on the surface of a shell of GIS equipment is arranged on the shell, and the GIS state diagnosis sub-device realizes state estimation and diagnosis of the GIS equip