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CN-121721481-B - Cable GIS terminal type test device and test method

CN121721481BCN 121721481 BCN121721481 BCN 121721481BCN-121721481-B

Abstract

The application provides a cable GIS terminal type test device, which is used for constructing an electromechanical integrated test platform integrating self-shielding environment simulation, multi-attitude working condition reproduction, self-adaptive electrical connection and built-in nondestructive detection, a Faraday cage effect is formed by a metal cabin of the device to replace a special shielding hall, a gesture driving mechanism is used for realizing safe switching of a terminal between horizontal and vertical working conditions, and a comprehensive solution for efficiently and accurately completing a cable GIS terminal full-project type test in a common environment is finally realized through a sensor and a self-adaptive electrical connection assembly.

Inventors

  • ZHANG ZEYAN
  • JIA ZHIDONG

Assignees

  • 清华大学深圳国际研究生院

Dates

Publication Date
20260508
Application Date
20260212

Claims (12)

  1. 1. A cable GIS terminal type test device is characterized by comprising: A mobile base (1); The free rotary bracket (2) is rotatably connected with the movable base (1) and is used for installing and supporting the cable GIS terminal in the test process; The gesture driving mechanism (5) is arranged on the movable base (1), and the output end of the gesture driving mechanism (5) is connected with the free rotation bracket (2) and is used for driving the free rotation bracket (2) to carry the cable GIS terminal to perform angle conversion between a horizontal gesture and a vertical gesture; The GIS simulation cabin body (6) is fixed on the free rotation support (2), and the metal shell of the GIS simulation cabin body forms an electromagnetic shielding environment; The self-adaptive electric connection assembly (7) is arranged in the GIS simulation cabin body (6) and is used for connecting a conducting rod (71) of the GIS simulation cabin body (6) with a wiring terminal (74) of a sleeve of the cable GIS terminal after the cable GIS terminal is installed; And the partial discharge detection assembly comprises a sensor (81) arranged on the inner wall of the GIS simulation cabin (6) and is used for detecting partial discharge signals of the cable GIS terminal in the electromagnetic shielding environment.
  2. 2. The cable GIS terminal type test device according to claim 1, wherein the free rotating bracket (2) is provided with at least two follow-up hoops (21) for locking the cable (3) of the cable GIS terminal during the overturning process of the free rotating bracket (2).
  3. 3. The cable GIS termination type test device according to claim 1 or 2, wherein the adaptive electrical connection assembly (7) is an adaptive plug-in electrical connector comprising: a connector body (72) connected to the conductive rod (71); an annular groove provided in the joint body (72); And a plurality of spring contact fingers (73) embedded in the annular groove and used for elastically contacting with the wiring terminal (74).
  4. 4. A cable GIS termination type test apparatus according to claim 3, wherein the spring finger (73) comprises a metal substrate and a silver plating layer covering the surface of the metal substrate.
  5. 5. The cable GIS terminal type test device according to claim 1, wherein an operation window (61) is provided on the side surface of the GIS simulation cabin body (6), the operation window (61) is provided with an integrated sealing cover plate, the integrated sealing cover plate is integrated with a barometer (621), a bidirectional charging and discharging valve (622) and a signal interface, and the signal interface is electrically connected with the sensor (81).
  6. 6. The cable GIS terminal type test device according to claim 1 or 5, wherein the sensor (81) is a very high frequency sensor having an operating frequency band of 300MHz to 3000MHz.
  7. 7. The cable GIS terminal type test device of claim 6, wherein the ultra-high frequency sensor is an ultra-thin flexible ultra-high frequency sensor, and the overall thickness is less than 3mm.
  8. 8. The cable GIS termination type test apparatus of claim 7, wherein the laminated structure of the ultra-thin flexible uhf sensor comprises: the copper grounding plate (811) is used for contacting with the inner wall of the GIS simulation cabin body (6) and grounding; a flexible dielectric layer (812) overlying the copper ground plane (811); A radiating copper foil layer (813) disposed on the flexible dielectric layer (812) and serving as an inductive antenna; and an insulating protective layer (814) covering the radiation copper foil layer (813).
  9. 9. The cable GIS terminal type test device according to claim 8, wherein the partial discharge detection assembly further comprises a signal transmission line (82) and a dielectric window (63), one end of the signal transmission line (82) is connected with the radiating copper foil layer (813) and the copper grounding plate (811) through a radio frequency connector (83), and the other end of the signal transmission line passes through a sealing channel pre-buried in the dielectric window (63) and is led out of the GIS simulation cabin (6).
  10. 10. A cable GIS terminal type test method employing the cable GIS terminal type test apparatus as set forth in any one of claims 1 to 9, the method comprising: The gesture horizontal setting step comprises the steps of controlling the gesture driving mechanism (5) to enable the free rotation bracket (2) to be in a horizontal gesture, installing and fixing a cable GIS terminal on the free rotation bracket (2), and electrically connecting the cable GIS terminal with a conductive rod (71) of the GIS simulation cabin body (6) through the self-adaptive electrical connection assembly (7); the cabin body sealing and inflating step, namely sealing the GIS simulation cabin body (6) and inflating insulating gas into the GIS simulation cabin body to rated pressure; Controlling the gesture driving mechanism (5) to drive the free rotation bracket (2) to carry the cable GIS terminal to change the angle to the vertical gesture and mechanically lock; And the test implementation step is that under the self-shielding environment formed by the GIS simulation cabin body (6), test voltage and current are applied to the cable GIS terminal in the vertical posture, and meanwhile, partial discharge signals are detected through the partial discharge detection assembly.
  11. 11. Method according to claim 10, characterized in that in the attitude level setting step, the cable (3) of the cable GIS terminal is locked using a follower anchor (21) provided on the free-rotating bracket (2).
  12. 12. An intelligent test system for a cable GIS terminal, which is characterized by comprising: a cable GIS termination pattern test apparatus as claimed in any one of claims 1 to 9; the data acquisition device (9) is in signal connection with the partial discharge detection assembly of the cable GIS terminal type test device; The processing and control unit is used for receiving partial discharge data uploaded by the data acquisition device (9) and controlling the action of the gesture driving mechanism (5); And a storage unit storing a computer program which, when executed by the processing and control unit, is used for controlling the cable GIS terminal type test device to execute the test method as claimed in claim 10 or 11 and analyzing the collected partial discharge data to diagnose the insulation state of the cable GIS terminal.

Description

Cable GIS terminal type test device and test method Technical Field The invention relates to the technical field of cable GIS terminal test, in particular to a cable GIS terminal type test device and a test method. Background The cable GIS (gas insulated fully enclosed combined electrical apparatus) terminal is a key node for connecting a cable and GIS equipment, and has a complex structure and comprises various insulating and mechanical parts. In order to ensure the long-term safe and reliable operation under high voltage and high current, the GIS terminal of each type of cable needs to be subjected to strict type test in the product research, development and shaping stage, and the factory test needs to be carried out before production and factory, wherein the sealing test, the power frequency withstand voltage test, the partial discharge test and the temperature rise test are core indexes for evaluating the quality of the cable GIS terminal. However, the existing cable GIS terminal testing technology and device have obvious limitations in practical application, and mainly show the following aspects: 1. The local discharge test has extremely high requirements on the field environment and lacks flexibility. At present, partial discharge detection for a GIS terminal mainly depends on a traditional pulse current method or an ultrahigh frequency method, and a standard test flow is usually required to be carried out in a professional high-voltage shielding hall because detection signals are weak and are extremely susceptible to external electromagnetic interference. The test mode relying on the fixed site has the defects of high construction cost and small quantity of the shielding hall, and is difficult to meet the requirement of large-scale factory detection, and the equipment needing field investigation cannot be provided with a shielding room on site, so that the detection flexibility is extremely poor. 2. The testing device has poor universality and cannot adapt to the slight difference among different models. The conducting rod in the test cabin body needs to be connected with the high-voltage end of the epoxy resin sleeve, so that a loop is formed. But even at the same voltage level, there is a slight gap in the size of different models of devices. When the test object is changed, the conducting rod terminal in the device is required to be replaced, so that the equipment investment cost is increased, and the test efficiency is also seriously reduced. 3. The mechanical fixation after the cable is taken out of the bin has a blind area, and the hidden insulating trouble is easy to induce. When the test is carried out, the cable needs to be led out from the test bin. The existing device often neglects the mechanical support and fixing problems after the cable is led out. Because the high-voltage cable has larger dead weight and certain rigidity, if the effective horizontal support is lacking, the cable is extremely easy to sag or twist abnormally under the action of gravity. The external mechanical deformation can be directly transmitted to the inside of the GIS terminal, so that the stress of an insulating interface between the stress cone and the epoxy sleeve is uneven, and an air gap or interface pressure is reduced, thereby inducing false partial discharge signals in the test process and even causing irreversible physical damage to the cable GIS terminal. 4. The existing test gesture is single, and it is difficult to simulate real operation conditions while guaranteeing installation efficiency. In order to reduce the installation difficulty and the operation strength of the large-section cable, the current cable GIS terminal type test is generally carried out horizontally. However, this single horizontal test layout does not reflect the vertical space requirements and stress conditions of the device in actual field installation. In actual operation, the cable GIS terminal is often installed vertically or obliquely at a large angle, and the cable GIS terminal can generate downward drawing force under the double effects of huge dead weight and thermal deformation generated by heavy load operation. If the test is only carried out in a horizontal state, the reliability of the internal mechanical structure and the insulation structure of the terminal under long-term vertical stress cannot be effectively verified, so that potential operation hidden troubles such as conductor disconnection, poor contact and the like cannot be exposed in a pattern test stage. Although the simple vertical test can solve the problem of simulation distortion, the heavy cable is required to be hoisted and centered at a certain height, so that the installation difficulty and the safety risk are greatly increased, and the test efficiency is reduced. Therefore, the existing fixed (whether purely horizontal or purely vertical) testing device cannot meet the requirement of efficiently and accurately verifying the reliability of the cable