CN102004201B - Cable gas insulated switchgear (GIS) terminal tester - Google Patents

Abstract

The invention relates to a cable GIS terminal test device, which includes an insulating cylinder, one end of the insulating cylinder is provided with a fixedly connected bottom plate, and the other end of the insulating cylinder corresponding to the bottom plate is provided with a fixedly connected bottom plate. Insulated top cover; a test cavity is formed between the insulating cylinder body, the insulating top cover and the bottom plate; the bottom plate is provided with a vacuum hole, and the vacuum hole is connected to the test cavity; the insulating top cover is provided with an outlet rod, One end of the outlet rod passes through the insulating top cover and then extends into the insulating cylinder, and the outlet rod is tightly connected with the insulating top cover; the end of the outlet rod corresponding to the end extending into the insulating cylinder is provided with a guide rod, and the guide rod It is electrically connected with the outgoing rod; the insulating cylinder is provided with a shielding electrode, and the shape of the insulating electrode matches the insulating cylinder; one end of the insulating electrode is fixed to the bottom plate. The invention has the advantages of simple and compact structure, light weight, strong field adaptability, low cost, convenient operation, safety and reliability.

Description

Cable GIS terminal test device

technical field

The present invention relates to a test device, especially a cable GIS terminal test device, specifically a test device for high-voltage cross-linked cables and corresponding accessories between switching stations with GIS terminals at both ends.

Background technique

There are usually two cases for cables using GIS (Gas Insulated Switchgear) terminals: the first case is that one end is a GIS terminal and the other end is an outdoor terminal; the second case is that both ends are GIS terminals. In the first case, when the completion test of the cable is carried out, it can generally be disconnected from the outdoor terminal and the overhead line, and a DC voltage (oil-filled cable) or AC voltage (cross-linked cable) is applied to the outdoor terminal of the cable for the completion test. In the cable completion test in the second case, due to the differences in the structure of the GIS cable switch gas chamber of each GIS equipment manufacturer, the structure in which the cable terminal is directly connected to the arrester and pressure transformer in the GIS gas chamber (without switch knife separation) has been used in recent years. It is very extensive, which leads to the test according to the withstand voltage value of the handover test, and the cable terminal, lightning arrester, and voltage change connecting rod must be removed. After the test is completed, the cable terminal is drawn out and the connecting rod is reinstalled. There are many units and the operation cycle is long. Once the completion test fails to meet the requirements, the workload of rework and maintenance will be heavy, and the time for putting the power system into use will be delayed, resulting in major economic losses. In the second case, when the completion test of the cable is carried out, the 24-hour power frequency withstand voltage test can only be adopted; this method cannot effectively verify the insulation level of the cable and accessories, the test period is long, and in some cases the power grid dispatching is also difficult. Such test conditions cannot be met.

For the completion test in the second case, there are test devices for cable loops alone in foreign countries, and they have become commercial products, but it is still blank in China. This kind of device abroad is relatively cumbersome, and it needs to be installed on the upper end of the GIS switch cabinet during the test, requiring the GIS switch station workshop to have a certain height for the test; therefore, this device is not suitable for the completion inspection of the domestic GIS switch station.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a cable GIS terminal test device, which has a simple and compact structure, light weight, strong field adaptability, low cost, convenient operation, safety and reliability.

According to the technical solution provided by the present invention, the cable GIS terminal test device includes an insulating cylinder, one end of the insulating cylinder is provided with a fixedly connected bottom plate, and the other end of the insulating cylinder corresponds to the bottom plate. There is a fixedly connected insulating top cover; a test cavity is formed between the insulating cylinder body, the insulating top cover and the bottom plate; There is an outlet rod, one end of the outlet rod passes through the insulating top cover and then extends into the insulating cylinder, and the outlet rod is tightly connected to the insulating top cover; the outlet rod is provided with a guide rod corresponding to the end extending into the insulating cylinder, The guide rod is electrically connected to the outlet rod; a shielding electrode is arranged in the insulating cylinder, and the shape of the insulating electrode matches the insulating cylinder; one end of the insulating electrode is fixed to the bottom plate.

A GIS terminal is provided on the bottom plate, and one end of the insulating terminal passes through the back shielding electrode of the bottom plate; the GIS terminal is electrically connected to the outlet rod through a guide rod.

The GIS terminal is provided with a shielding case corresponding to the end located in the shielding electrode; one end of the guide rod is electrically connected to the GIS terminal after passing through the shielding case. The GIS terminal is covered with a snap ring corresponding to one end outside the insulating cylinder, and the snap ring is fastened to the bottom plate through snap ring fastening bolts.

The insulating top cover is fixedly connected with the insulating cylinder through insulating bolts. The bottom plate is fixedly connected with the insulating cylinder through the bottom plate fixing bolts. The test cavity is filled with insulating gas through the vacuum hole. The insulating gas includes nitrogen; the pressure of the insulating gas in the test chamber is 0.2-0.4 MPa.

A positioning plate is installed on the outlet rod through a positioning pin, both the positioning plate and the positioning pin are located outside the insulating cylinder, and the positioning plate is adjacent to the insulating top cover. A flat washer is provided between the positioning plate and the insulating top cover, and the flat washer is sleeved on the outlet rod.

The advantages of the present invention are: the two ends of the insulating cylinder form a test cavity through the bottom plate and the insulating top cover, and the test cavity is filled with nitrogen or other inert gases, avoiding the pollution caused by the use of SF ₆ gas; the insulating cylinder is equipped with an insulating Electrodes, the GIS terminal extends into the insulated electrode, so as to ensure that the electric field distribution of the GIS terminal during testing is the same as the electric field distribution during operation; It is convenient and fast, reduces the use conditions for GIS testing, has low weight, strong field applicability, and is safe and reliable.

Description of drawings

Figure 1 is a diagram of the state of use of the present invention.

Detailed ways

The present invention will be further described below in conjunction with specific drawings and embodiments.

As shown in Figure 1: the present invention includes an outlet rod 1, a positioning pin 2, a positioning plate 3, a flat washer 4, an insulating bolt 5, an insulating top cover 6, a guide rod 7, an insulating gas 8, an insulating cylinder 9, and a shielding cover 10 , shielding electrode 11, GIS terminal 12, bottom plate fixing bolt 13, bottom plate 14, shell vacuum port 15, snap ring 16, vacuum hole 17 and snap ring fastening bolt 18.

As shown in Figure 1: one end of the insulating cylinder 9 is provided with a fixedly connected bottom plate 14, the bottom plate 14 matches the shape of the end of the insulating cylinder 9, and the bottom plate 14 is connected to the insulating cylinder through the bottom plate fixing bolt 13. The body 9 is fixed, and the bottom plate fixing bolts 13 are made of metal materials. The other end of the insulating cylinder 9 corresponding to the bottom plate 14 is provided with a fixedly connected insulating top cover 6, and the insulating top cover 6 also matches the shape of the end of the insulating cylinder 9; the insulating top cover 6 is connected by an insulating bolt 5 is fixed with insulating cylinder 9. In the insulating cylinder 9, a test cavity is formed by the bottom plate 14 and the insulating top cover 6; the bottom plate 14 is provided with vacuum holes 17, and the vacuum holes 17 are distributed along the axis perpendicular to the insulating cylinder 8, and the vacuum holes 17 It communicates with the test cavity; the test cavity can be evacuated into a vacuum state through the vacuum hole 17, and the insulating gas 8 is injected into the test cavity through the vacuum hole 17. The end of the vacuum hole 17 forms a vacuum opening 15 for the casing.

The central area of the insulating top cover 6 is provided with an outlet rod 1 , and one end of the outlet rod 1 passes through the insulating top cover 6 and extends into the insulating cylinder 9 . The outlet rod 1 is provided with a positioning plate 3 corresponding to one end outside the insulating cylinder 9 , and the positioning plate 3 is installed on the outlet rod 1 through a positioning pin 2 . The positioning plate 3 and the positioning pin 2 are adjacent to the insulating top cover 6 , and a flat washer 4 is also provided between the positioning plate 3 and the insulating top cover 4 , and the flat washer 4 is sleeved on the outlet rod 1 . Because the end of the outlet rod 1 corresponding to the insertion into the insulating cylinder 9 is relatively large, the end of the outlet rod 1 corresponding to the insertion into the insulation cylinder 9 will not be pulled out of the insulation cylinder 9; the outlet rod 1 corresponds to the setting The positioning plate 3 and the positioning pin 2 can ensure that the outlet rod 1 will not be further pushed into the insulating cylinder 9 , thereby ensuring the positioning connection between the outlet rod 1 and the insulating top cover 6 . The outlet rod 1 is provided with a guide rod 7 corresponding to the end inside the insulating cylinder 9 , the guide rod 7 is embedded in the groove of the outlet rod 1 , and the guide rod 7 is electrically connected with the outlet rod 1 .

The insulating cylinder 9 is also provided with a shielding electrode 11, the shielding electrode 11 is made of metal material; one end of the shielding electrode 11 is fixedly connected to the bottom plate 14, and the shielding electrode 11 is in the insulating cylinder 9 along the insulating cylinder 9. The axial length distribution of the shielding electrode 11 is smaller than the size of the insulating cylinder 9, and the shielding electrode 11 can ensure the electric field distribution of the GIS terminal 12 inside the shielding electrode 11.

The base plate 14 is provided with a GIS terminal 12 , and one end of the GIS terminal 12 extends into the shielding electrode 11 after passing through the base plate 14 . In order to make the GIS terminal 12 fixedly installed on the base plate 14, a snap ring 16 is sleeved on the GIS terminal 12, and the snap ring 16 is located outside the insulating cylinder 9; Fixed connection, so that the GIS12 is fixedly installed on the base plate 14. The GIS terminal 12 is correspondingly provided with a shielding cover 10 at the end portion located in the shielding electrode 11, and the GIS terminal 12 is electrically connected with the other end of the guide rod 7 corresponding to the outlet rod 1; the guide rod 7 is correspondingly connected with the outlet rod 1 The other end passes through the shielding case 10 and is connected to the GIS terminal 12 .

As shown in FIG. 1 : when in use, after the GIS terminal 12 to be tested is installed, a completion test needs to be carried out before entering the switch cabinet. First, the bottom plate 14 is inserted into the GIS terminal 12, and the bottom plate 14 is connected and fixed with the GIS snap ring 16 by the snap ring fixing bolt 18. After the shielding cover 10 is installed at the end of the GIS terminal 12, the end of the GIS terminal 12 corresponding to the shielding cover 10 is inserted into the shielding electrode 11, and the shielding electrode 11 is fixed on the bottom plate 14 with metal bolts. The shielding electrode 11 is mainly used To balance the distribution of the internal electric field, make the internal electric field of the device consistent with the actual circuit. Then the guide rod 7 is installed, and inserted into the insulating cylinder 9, and the insulating cylinder 9 is connected and fixed with the base plate 14 with the base plate fixing bolts 13. Before the insulating top cover 6 is fixedly installed on the insulating cylinder 9, the outlet rod 1, the positioning pin 2, the positioning plate 3, and the flat gasket 4 are installed on the insulating top cover 6 to form a sealing structure, which will not be disassembled in the completion test in the future. Install the insulating top cover 6 at last, when installing the top cover, the center will be aligned, so that the guide rod 7 is inserted in the groove of the outlet rod 1, and the insulating top cover 6 is connected and fixed with the insulating cylinder 9 with the insulating bolt 5.

After the completion test device is installed, it is necessary to evacuate the test cavity in the insulating cylinder 9 through the vacuum port 15 of the shell, and fill it with 0.2-0.4Mpa _N2 gas or other inert gas as the insulating gas 8, thereby replacing SF ₆ gas, to avoid environmental pollution. During the test, the outlet rod 1 is used as the high-voltage lead-in end, and the voltage value specified in the test is applied to carry out the completion test, and the corresponding test data are obtained; due to the effect of the insulating cylinder 9 and the shielding electrode 11, the electric field distribution at the end of the GIS terminal 12 is consistent with the actual The electric field distribution is consistent, so that the validity of the test can be guaranteed. After the test, open the vent valve to release the insulating gas 8, and then remove the insulating top cover 6, the insulating cylinder 9, the guide rod 7, the shielding electrode 11, the shielding cover 10, and the metal bottom plate 14 in sequence. Finally plug the GIS terminal into the switch cabinet.

The two ends of the insulating cylinder 9 of the present invention form a test cavity through the bottom _plate 14 and the insulating top cover 6, and nitrogen or other inert gases are filled in the test cavity, avoiding the pollution caused by the use of SF gas; There are insulated electrodes 11, and the GIS terminal 12 extends into the insulated electrode 11, thereby ensuring that the electric field distribution of the GIS terminal 12 during testing is the same as the electric field distribution during operation; The device is easy to install and use, convenient and quick to test the GIS terminal, reduces the use conditions of the GIS test, has low weight, strong field applicability, and is safe and reliable.

Claims (7)

1. A cable GIS terminal test device, characterized in that it includes an insulating cylinder (9), one end of the insulating cylinder (9) is provided with a fixedly connected bottom plate (14), and the insulating cylinder (9) Corresponding to the other end of the bottom plate (14), a fixedly connected insulating top cover (6) is provided; a test chamber is formed between the insulating cylinder (9), the insulating top cover (6) and the bottom plate (14); the bottom plate (14) is provided with a vacuum hole (17), and the vacuum hole (17) is connected with the test chamber; the insulating top cover (6) is provided with an outlet rod (1), and the outlet rod ( One end of 1) passes through the insulating top cover (6) and extends into the insulating cylinder (9), and the outlet rod (1) is tightly connected with the insulating top cover (6); the outlet rod (1) corresponds to the insulation A guide rod (7) is provided at the end of the cylinder (9), and the guide rod (7) is electrically connected to the outlet rod (1); a shielding electrode (11) is provided inside the insulating cylinder (9), and the The shape of the insulating electrode (11) matches the insulating cylinder (9); one end of the insulating electrode (11) is fixed to the bottom plate (14); The base plate (14) is provided with a GIS terminal (12), and one end of the GIS terminal (12) extends into the shielding electrode (11) after passing through the base plate (14); the GIS terminal (12) passes through the guide rod (7) Electrically connected with the outlet rod (1); The GIS terminal (12) is provided with a shielding case (10) corresponding to the end inside the shielding electrode (11); one end of the guide rod (7) passes through the shielding case (10) and is electrically connected to the GIS terminal (12). 2. The cable GIS terminal test device according to claim 1, characterized in that: the GIS terminal (12) is covered with a snap ring (16) corresponding to one end outside the insulating cylinder (9), and the snap ring (16) Fasten and connect with the bottom plate (14) through the snap ring fastening bolts (18). 3. The cable GIS terminal test device according to claim 1, characterized in that: the insulating top cover (6) is fixedly connected to the insulating cylinder (9) through insulating bolts (5). 4. The cable GIS terminal test device according to claim 1, characterized in that: the bottom plate (14) is fixedly connected to the insulating cylinder (9) through bottom plate fixing bolts (13). 5. The cable GIS terminal test device according to claim 1, characterized in that: the test cavity is filled with insulating gas (8) through a vacuum hole (17). 6. The cable GIS terminal test device according to claim 1, characterized in that: a positioning plate (3) is installed on the outlet rod (1) through a positioning pin (2), and the positioning plate (3) is connected to the positioning The pins (2) are located outside the insulating cylinder (9), and the positioning plate (3) is adjacent to the insulating top cover (6). 7. The cable GIS terminal test device according to claim 6, characterized in that: a flat washer (4) is provided between the positioning plate (3) and the insulating top cover (6), and the flat washer (4) covers on the outlet rod (1).

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