CN216622531U

CN216622531U - Insulating tool for 27.5kV GIS terminal testing

Info

Publication number: CN216622531U
Application number: CN202122751110.XU
Authority: CN
Inventors: 李鑫; 张润浩; 黄伟立
Original assignee: Zhejiang Wanma Co Ltd
Current assignee: Zhejiang Wanma Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-05-27
Anticipated expiration: 2031-11-10

Abstract

An insulation tool for 27.5kV GIS terminal testing comprises an epoxy resin workpiece, a metal shielding cover, a metal flange, an insulator containing workpiece, a high-voltage insulator and a high-voltage insulator lead-in valve. The epoxy resin part, the metal shielding cover and the metal flange are cast into a hat-shaped part similar to a hat, and bolt holes used for being connected with tail pipes on the tested GIS terminals through bolts are formed in the hat-shaped part. The metal flange is detachably and hermetically connected with the insulating object containing part. The high-voltage insulator lead-in valve is fixedly arranged on the insulator containing part, and the high-voltage insulator with certain pressure is filled in the space defined by the epoxy resin part, the insulator containing part and the high-voltage insulator lead-in valve. The insulating tool for testing the 27.5kV GIS terminal is used for detecting the 27.5kV GIS terminal before leaving a factory, so that the unqualified 27.5kV GIS terminal can be effectively prevented from entering the market.

Description

Insulating tool for 27.5kV GIS terminal test

Technical Field

The utility model relates to a testing tool, in particular to an insulating tool for 27.5kV GIS terminal testing.

Background

In recent years, the electrified railway is vigorously developed in China, the use amount of 27.5kV cables is increased year by year, and the GIS switch cabinet has the functions of cutting off and connecting a circuit, automatically removing faults and the like, so that the use amount of the GIS switch cabinet on the electrified railway is continuously increased. The 27.5kV GIS terminal is used for connecting a cable and a switch cabinet, and the quality of the GIS terminal directly influences whether a line is safe and reliable for power supply.

Patent documents entitled "an online monitoring system for a GIS switch cabinet" with application number 201920081152.7 and grant publication number CN 209673141U disclose an online monitoring system for a GIS switch cabinet: the system comprises a cloud server, a monitoring host, a communication module, a voltage measuring circuit, a current measuring circuit and a switch measuring circuit; the voltage measuring circuit measures the voltage values of an energy storage motor and a coil of a circuit breaker in the switch cabinet and transmits the measurement result to the monitoring host; the current measuring circuit measures the current values of an energy storage motor and a coil of a circuit breaker in the switch cabinet and transmits the measurement result to the monitoring host; the switch measuring circuit detects the on-off between the energy storage motor and the coil of the circuit breaker in the switch cabinet and the power supply and transmits the detection result to the monitoring host. "the utility model discloses an on-line monitoring system utilizes voltage data, current data and the break-make data of measuring circuit measurement switch cabinet internal energy storage motor and coil, and the operating condition of real time monitoring circuit breaker helps electric power maintainer to implement the particular case of understanding current cubical switchboard, in time discovers potential safety hazard and trouble reason. The specification is similar to that of a transmission line with the voltage of more than 35KV, and the problem that once an obstacle occurs, a power person needs to check the obstacle by a conventional means, so that the operation efficiency is low is solved.

Application No. 201510109953.6, grant bulletin No. CN 104729584B, entitled "GIS switch cabinet online detection system based on surface acoustic wave" discloses another GIS switch cabinet online detection system: the system comprises a plurality of SAW sensors, a radio frequency signal transmitting and receiving device, an SAW sensor collector, a background monitoring system and a sensor fixing mechanism; the SAW sensors are fixed in the GIS switch cabinet through a sensor fixing mechanism; the SAW sensor collector sends corresponding frequency signals to each SAW sensor through the radio frequency signal transmitting and receiving device and collects signals of the return frequency of the SAW sensor; and transmitting the data to a background monitoring system through communication; the SAW sensor includes a plurality of SAW temperature sensors. The utility model utilizes the SAW sensor to measure various physical quantities (such as temperature, pressure and micro-water) in the GIS switch cabinet, can reflect the running state of the whole equipment through the change of the physical quantities, and transmits data to a monitoring system and a background in a unified manner through an extended communication mode after being collected by the SAW sensor collector, thereby realizing online monitoring. But it does not specify the question of whether it is applicable to an electrified railway 27.5kV line.

The above two patent technologies all relate to the online detection problem in the use process of the GIS switch cabinet, do not relate to the problem of the connection quality when the 27.5kV GIS terminal is used for connecting a cable and the switch cabinet, and especially do not relate to the problem of factory inspection of the 27.5kV GIS terminal. The delivery quality of the 27.5kV GIS terminal has direct influence on the connection quality of the cable and the switch cabinet by using the 27.5kV GIS terminal.

Disclosure of Invention

The utility model mainly aims to provide a method for judging the connection quality problem when a 27.5kV GIS terminal is used for connecting with a target cable in a use place after being shipped from a factory.

The technical scheme adopted by the utility model is as follows: an insulation tool for 27.5kV GIS terminal test comprises an epoxy resin workpiece, a metal shielding case, a metal flange, an insulator workpiece, a high-voltage insulator and a high-voltage insulator lead-in valve;

the epoxy resin part and the metal shielding case are both axisymmetric barrel-like parts. The barrel opening of the epoxy resin part is contacted with one side surface of the metal flange, and the metal shielding cover is positioned in the barrel bottom of the epoxy resin part. The epoxy resin part, the metal shielding cover and the metal flange are cast into a hat-shaped part similar to a hat, and bolt holes for connecting tail pipes on the tested GIS terminal with bolts are formed in the hat-shaped part:

the insulating object holding part is a barrel-like part or a tube-like part;

when the insulating object containing part is a barrel-like part, the metal flange is detachably and hermetically connected with a barrel opening for containing the insulating object, the epoxy resin part and the metal shielding cover are positioned in a space surrounded by the side wall for containing the insulating object, the high-voltage insulating object lead-in valve is fixedly arranged on the barrel wall for containing the insulating object, and the high-voltage insulating object with certain pressure is filled in the space determined by the epoxy resin part, the insulating object containing barrel and the high-voltage insulating object lead-in valve;

when the insulating object containing parts are tube-like parts, the two top-hat-shaped parts are oppositely arranged at two ends of the insulating object containing parts; the high-voltage insulator lead-in valve is fixedly arranged on the pipe wall for containing the insulator, and the high-voltage insulator with certain pressure is filled in a space defined by the two epoxy resin parts, the insulator containing part and the high-voltage insulator lead-in valve.

Here, the insulating object is preferably a non-magnetic and light aluminum alloy material, and the whole is made by welding. The high voltage insulation is fluid: the various insulating oils and the various non-conductive gases are one of natural mineral oil, silicone oil, trichlorobiphenyl, vegetable oil, nitrogen, hydrogen and the like. The hat-shaped part formed by integrally casting the epoxy resin part, the metal shielding cover and the metal flange is a rigid part. Before the formal test is started, the high-voltage insulator can reach the required pressure value in the space determined by the high-voltage insulator lead-in valve, the epoxy resin part, the insulator containing part and the high-voltage insulator lead-in valve. Before formal testing, the GIS terminal to be tested is connected with a testing cable, the corresponding part of the GIS terminal to be tested is plugged into the inner cavities of the epoxy resin part and the metal shielding cover, the tail pipe on the GIS terminal to be tested is fixedly connected with an integrated hat-shaped part formed by pouring the epoxy resin part, the metal shielding cover and the metal flange through bolts, and then a set testing voltage is applied to the GIS terminal far away from the testing cable so as to realize corresponding testing. The utility model has simple structure and easy processing and manufacturing, and is beneficial to finding and solving problems as soon as possible.

Preferably, the high voltage insulator is SF6 gas. SF6 gas is an excellent artificial inert gas, the electric strength is 2.5 times of that of nitrogen gas under the same pressure, the breakdown voltage is 2.5 times of that of air, the arc extinguishing capability is 100 times of that of air, and the material is a new generation of ultrahigh voltage insulating medium material superior to air, oil and other insulators.

Preferably, a sealing ring is arranged between the abutting surfaces of the metal flange and the insulating object containing part. This preferred scheme, simple structure uses safe and reliable.

Preferably, a pressure gauge is arranged on the wall of the barrel or the pipe for containing the insulating material. This preferred scheme is favorable to people to observe the size of the pressure of splendid attire insulator finished piece internal insulation. Preferably, the pressure gauge is connected with a buzzer, and when the pressure of the insulation in the insulation containing part is lower than or exceeds a set certain value, the buzzer sounds in time to give an alarm, so that the insulation is replenished or the filling of the insulation is stopped in time.

In conclusion, the 27.5kV GIS terminal can be detected in advance before leaving the factory by using the method, so that the unqualified 27.5kV GIS terminal can be effectively prevented from entering the use market.

Drawings

FIG. 1: the utility model has a structure schematic diagram;

in the figure: the device comprises an epoxy resin part 1, a metal shielding case 2, a metal flange 3, an insulator containing part 4, a high-voltage insulator 5, a tail pipe 6, a high-voltage insulator lead-in valve 7, a pressure gauge 8, a GIS terminal 9 and a test cable 10.

Detailed Description

The technical scheme of the utility model is further specifically described by the following embodiments and the accompanying drawings. In the following examples, the insulating material-containing member 4 is a barrel-like member.

As shown in figure 1, the utility model comprises an epoxy resin product 1, a metal shielding case 2, a metal flange 3, an insulator containing product 4, a high-voltage insulator 5, a high-voltage insulator lead-in valve 7 and a pressure gauge 8. The high-voltage insulator 5 is preferably SF6 gas, accordingly, the high-voltage insulator introducing valve 7 is an inflation valve, and the pressure gauge 8 is a gas pressure gauge. The epoxy resin product 1, the metal shielding case 2, the metal flange 3 and the insulation containing product 4 are axisymmetric products. The epoxy resin part 1 and the metal shielding case 2 are both barrel-like parts. The right side of the epoxy resin product 1 and the left side of the metal flange 3 are contacted together, and the metal shielding case 2 is positioned in the left end of the epoxy resin product 1. The epoxy resin part 1, the metal shielding case 2 and the metal flange 3 are cast to form a top hat-like part, and bolt holes for connecting with the tail pipe 6 on the 27.5kV GIS terminal to be tested are formed in the top hat-like part. The barrel bottom for containing the insulating object parts 4 is positioned at the left end, a sealing ring mounting groove is formed in the right end face of the barrel opening for containing the insulating object parts 4, a sealing ring not shown in the drawing is placed in the sealing ring mounting groove, the metal flange 3 and the barrel opening for containing the insulating object parts 4 are detachably connected through a plurality of screws, and the sealing ring ensures the sealing performance of the detachable connection of the metal flange 3 and the barrel opening for containing the insulating object parts 4.

The high-pressure insulator lead-in valve 7 and the pressure gauge 8 are fixedly arranged on the barrel wall for containing the insulator product 4. The insulation (SF 6 gas in this embodiment) is filled into the space defined by the epoxy resin product 1, the insulation product 4 and the high-voltage insulation material inlet valve 7 through the high-voltage insulation material inlet valve 7 until a certain pressure value (three atmospheric pressures in this embodiment) is formed, and the inflation is stopped, and the pressure gauge 8 is used for displaying the pressure of the high-voltage insulation material in the space defined by the epoxy resin product 1, the insulation product 4 and the high-voltage insulation material inlet valve 7.

When the device is used, a GIS terminal 9 to be tested and a test cable 10 are connected to form a tested assembly, then the left end (the main body is the GIS terminal 9) of the tested assembly is inserted into the corresponding position of the integrated product cast by the epoxy resin product 1, the metal shielding cover 2 and the metal flange 3, and a tail pipe 6 on the GIS terminal, the epoxy resin product 1, the metal shielding cover 2 and the metal flange 3 are cast into the integrated product cast into the product similar to a hat-shaped product and fixedly connected by bolts, so that corresponding test operation can be carried out.

The above-described embodiments are merely preferred embodiments of the present invention, and do not limit the structure and scope of the present invention. Indeed, many equivalent variations in the shapes, constructions and design objectives of the elements described may be made in accordance with the present invention. Therefore, all equivalent changes in the shapes, structures and design objectives of the present invention are intended to be covered by the present invention, and all such equivalent changes are intended to be protected by the present invention.

Claims

1. The utility model provides a 27.5kV GIS terminal test is with insulating frock, characterized by: the high-voltage insulation device comprises an epoxy resin product (1), a metal shielding case (2), a metal flange (3), an insulation product (4), a high-voltage insulator (5) and a high-voltage insulator lead-in valve (7);

the epoxy resin part (1) and the metal shielding case (2) are both axisymmetric barrel-shaped parts; the barrel opening of the epoxy resin part (1) is attached to one side face of the metal flange (3), and the metal shielding cover (2) is positioned in the barrel bottom of the epoxy resin part (1); the epoxy resin part (1), the metal shielding cover (2) and the metal flange (3) are cast into a hat-shaped part similar to a hat, and bolt holes for connecting tail pipes (6) on the tested GIS terminal together by bolts are arranged on the hat-shaped part:

the insulating object holding part (4) is a barrel-like part or a tube-like part;

when the insulating object containing part (4) is a barrel-like part, the metal flange (3) is detachably and hermetically connected with a barrel opening for containing the insulating object containing part (4), the epoxy resin part (1) and the metal shielding cover (2) are positioned in a space surrounded by the side wall of the insulating object containing part (4), the high-pressure insulating object introducing valve (7) is fixedly arranged on the barrel wall of the insulating object containing part (4), and the high-pressure insulating object (5) with certain pressure is filled in the space determined by the epoxy resin part (1), the insulating object containing part (4) and the high-pressure insulating object introducing valve (7);

when the insulating object containing part (4) is a pipe-like part, two hat-shaped parts are oppositely arranged at two ends of the insulating object containing part (4); the high-voltage insulator lead-in valve (7) is fixedly arranged on the pipe wall of the insulator containing part (4), and the high-voltage insulator (5) with certain pressure is filled in a space determined by the two epoxy resin parts (1), the insulator containing part (4) and the high-voltage insulator lead-in valve (7).

2. The insulation tool for the 27.5kV GIS terminal test according to claim 1, which is characterized in that: the high-voltage insulator (5) is SF6 gas.

3. The insulation tool for the 27.5kV GIS terminal test according to claim 1, which is characterized in that: a sealing ring is arranged between the binding surfaces of the metal flange (3) and the insulating object containing part (4).

4. The insulation tool for the 27.5kV GIS terminal test according to claim 1, which is characterized in that: a pressure gauge (8) is arranged on the barrel wall or the pipe wall for containing the insulating material parts (4).