CN117310218A - GIL equipment for cable phase-change voltage withstand test - Google Patents

Abstract

The invention relates to the technical field of power transmission equipment, and in particular to a GIL equipment used for cable commutation withstand voltage testing, including a standard combination module, an isolation unit, a straight section unit and a right-angle unit. The standard combination module consists of two isolation units, A right-angle unit is composed of a telescopic section, and one end of the straight unit is connected to the isolation unit. The GIL equipment in the present invention adopts the form of gas-insulated metal sealing. The insulating gas is SF6. The shell and conductors are made of aluminum alloy materials. The main structure is modular in design, which facilitates quick installation, disassembly, movement and storage on site. Application of GIL equipment It solves the problem of completing the on-site AC withstand voltage test of any circuit of high-voltage cables without affecting the operation of GIS and outlet equipment. GIL is used as equipment to conduct voltage withstand tests for high-voltage cables, replacing the traditional test method without the need for The outlet equipment, GIS pipe mother and switch were powered off at the same time for the test, which was the first application in the power industry.

Description

A GIL equipment for cable commutation withstand voltage test

Technical field

The present invention relates to the technical field of power transmission equipment, and in particular to a GIL equipment used for cable commutation withstand voltage testing.

Background technique

Gas Insulated Metal Enclosed Transmission Line, referred to as GIL (Gas Insulated Metal Enclosed Transmission Line), uses aluminum alloy conductors and shells, and uses epoxy support insulators to support the conductors, so that the conductors are fixed in the center of the shell, between the conductor and the shell Filled with SF6 gas to ensure the insulation level between the conductor and the shell; as a long-distance transmission line, GIL is mainly used in areas with relatively large transmission capacity, high voltage and high safety and reliability requirements. Its main features are: (1) Reliable High performance and long service life, (2) strong transmission capacity, (3) low loss, (4) small electromagnetic pollution, (5) convenient processing, manufacturing, installation, operation and maintenance.

In the existing AC withstand voltage test of high-voltage cables, pressure can only be applied to the outdoor outlet casing, and the voltage is introduced into the cable under test through the outlet casing, GIS tube mother, switch and other equipment. This test method requires outlet equipment, Equipment such as GIS pipe headers, switches, and even GIS busbars must cooperate with power outages. When the switch station and outlet equipment are already in operation, it is difficult to achieve simultaneous power outages for the above-mentioned equipment due to restrictions on grid operation safety, power station output, and grid dispatch.

Contents of the invention

The purpose of the present invention is to propose a GIL equipment for cable commutation withstand voltage testing in order to solve the shortcomings existing in the prior art.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A GIL equipment used for cable commutation withstand voltage test, including a standard combination module, an isolation unit, a straight section unit and a right-angle unit. The standard combination module is composed of two isolation units, one right-angle unit and one telescopic section. One end of the straight section unit is connected to the isolation unit, which includes a partition port and an SF6 meter valve;

One end of the partition is connected to the straight section unit, one end of the isolation unit is connected to a docking sleeve, one end of the docking sleeve is connected to a cable terminal, and a GIS is provided between the docking sleeve and the cable terminal. , the GIS and cable terminals were in running state before the test;

One end of the right-angle unit is connected to a docking cable, and the side of the docking cable away from the right-angle unit is connected to GIL equipment. One end of the GIL equipment is connected to a high-voltage composite sleeve, and the other end is connected to the GIS. The high-voltage composite sleeve Pressure-resistant equipment is placed near the pipe.

Preferably, the GIL equipment is provided with several SF6 meter valves, of which three SF6 meter valves are set on the isolation unit, one is set on the vertical section on one side of the cable terminal, and three are set near the partition opening. An SF6 meter valve is provided on the vertical section of the SF6 meter valve and the partition port. The SF6 meter valve provided on the partition port is provided with a vacuum interface and an inflation interface.

Preferably, the number of the telescopic joint is one, which is used to adjust the axial error during equipment installation.

Preferably, a multifunctional support vehicle is provided at the bottom of the GIL equipment, and the multifunctional support vehicle is used to support the entire GIL equipment.

Preferably, the multi-functional support vehicle is provided with a hydraulic cylinder inside, and the hydraulic cylinder is used to adjust the installation height of the GIL equipment.

Preferably, the bottom of the multi-functional support vehicle is provided with four universal wheels. The universal wheels are used for position adjustment during equipment installation and for lifting and lowering at the same time.

Preferably, one end of the partition port is connected to three-phase high-voltage cable tests A, B, and C.

Preferably, one end of the cable terminal is connected to an adjustable contact, the adjustable contact can rotate at any angle, and a contact finger is connected between the adjustable contact and the cable terminal.

The beneficial effects of the present invention are:

The GIL equipment in the present invention adopts the form of gas-insulated metal sealing. The insulating gas is SF6. The shell and conductors are made of aluminum alloy materials. The main structure is modular in design, which facilitates quick installation, disassembly, movement and storage on site. Application of GIL equipment , solved the problem of completing the on-site AC withstand voltage test of any circuit high-voltage cable without affecting the operation of GIS and outlet equipment, using GIL as equipment to conduct the voltage withstand test for high-voltage cables, replacing the traditional test method, without It is necessary to test the simultaneous power outage of the outlet equipment, GIS pipe mother and switch, which is the first application in the power industry.

Through the modular structure design of GIL equipment, the straight section unit can be designed into different lengths according to the needs of the test circuit, which facilitates on-site assembly and splicing.

The multifunctional support vehicle used in GIL equipment can be used as a transportation and installation vehicle, or as a fixed bracket to support the entire GIL equipment during testing.

The structure connected to the cable terminal adopts an adjustable contact, so that the adjustable contact can rotate at any angle, so that the insertion error between the contact and the contact finger can be adjusted according to needs.

The length of the straight unit and right-angle unit in the standard combination module can be determined according to the three-phase spacing of the loop cable ABC. By using telescopic joints, errors during on-site installation can be absorbed, thereby improving the installation efficiency of GIL and saving installation time.

Description of drawings

Figure 1 is a schematic diagram of the general circuit of a GIL equipment used for cable commutation withstand voltage testing proposed by the present invention;

Figure 2 is a schematic diagram of the connection structure between GIL and cable terminal of a GIL equipment used for cable commutation withstand voltage test proposed by the present invention;

Figure 3 is a schematic structural diagram of a high-voltage composite bushing and voltage-resistant equipment of GIL equipment used for cable commutation withstand voltage tests proposed by the present invention;

Figure 4 is a schematic diagram of the phase A test of the GIL equipment used for the cable commutation withstand voltage test proposed by the present invention;

Figure 5 is a B-phase test schematic diagram of a GIL equipment used for cable commutation withstand voltage test proposed by the present invention;

Figure 6 is a C-phase test schematic diagram of a GIL equipment used for cable commutation withstand voltage test proposed by the present invention;

Figure 7 is a schematic structural diagram of an expansion joint of GIL equipment used for cable commutation withstand voltage testing proposed by the present invention;

Figure 8 is a schematic diagram of the GIL and cable terminal voltage withstand structure of a GIL equipment used for cable commutation withstand voltage test proposed by the present invention.

In the picture:

1. Standard combination module; 2. Isolation unit; 3. Straight section unit; 4. Right-angle unit; 5. Partition opening; 6. Expansion joint; 7. SF6 meter valve; 8. GIS; 9. Cable terminal; 10. High pressure Composite casing; 11. Pressure-resistant equipment; 12. Multifunctional support vehicle; 13. Butt joint casing; 14, Butt cable.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments.

Contents not described in detail in this specification belong to the prior art known to those skilled in the art.

The standard parts used in the present invention can be purchased from the market, and the special-shaped parts can be customized according to the instructions and drawings. The specific connection methods of each part are all mature bolts, rivets, welding, etc. in the existing technology. Conventional means, machinery, parts and equipment all adopt conventional models in the prior art, and circuit connections adopt conventional connection methods in the prior art, which will not be described in detail here.

Example:

Referring to Figure 1-8, a GIL equipment used for cable commutation withstand voltage test includes a standard combination module 1, an isolation unit 2, a straight unit 3 and a right-angle unit 4. The standard combination module 1 consists of two isolation units 2, A right-angle unit 4 is composed of a telescopic section 6. One end of the straight unit 3 is connected to the isolation unit 2. The isolation unit 2 includes a partition port 5 and an SF6 meter valve 7;

One end of the partition opening 5 is connected to the straight section unit 3, one end of the isolation unit 2 is connected to a docking sleeve 13, one end of the docking sleeve 13 is connected to a cable terminal 9, and a GIS 8 is provided between the docking sleeve 13 and the cable terminal 9 , GIS8 and cable terminal 9 were both running before the test;

One end of the right-angle unit 4 is connected to a docking cable 14, and the side of the docking cable 14 away from the right-angle unit 4 is connected to a GIL device. One end of the GIL device is connected to a high-voltage composite casing 10, and the other end is connected to the GIS 8. The high-voltage composite casing 10 Pressure-resistant equipment 11 is placed nearby.

There are several SF6 meter valves 7 installed on the GIL equipment. Three SF6 meter valves 7 are set on the isolation unit 2, one is set on the vertical section on one side of the cable terminal 9, and three SF6 meter valves are set near the isolation port 5. An SF6 meter valve 7 is provided on the valve 7 and the vertical section of the partition port 5. The SF6 meter valve 7 provided on the partition port 5 is provided with a vacuum interface and an inflation interface.

The number of telescopic joints 6 is one, which is used to adjust the axial error during equipment installation.

A multifunctional support vehicle 12 is provided at the bottom of the GIL equipment, and the multifunctional support vehicle 12 is used to support the entire GIL equipment.

The multi-functional support vehicle 12 is provided with a hydraulic cylinder inside, and the hydraulic cylinder is used to adjust the installation height of the GIL equipment.

The bottom of the multifunctional support vehicle 12 is provided with four universal wheels, which are used for position adjustment during equipment installation and for lifting and lowering at the same time.

One end of the partition port 5 is connected with three-phase high-voltage cables A, B, and C for testing.

One end of the cable terminal 9 is connected with an adjustable contact, the adjustable contact can rotate at any angle, and a contact finger is connected between the adjustable contact and the cable terminal 9 .

In this implementation plan, when the GIL equipment needs to be used, the GIL of the corresponding length is first assembled according to the GIS8 interval where the test cable is actually located, and the GIL is connected to the cable through the end GIS8 docking unit, thereby conducting an insulation assessment on the cable. When there are many cable loops in the station, the first choice is to consider the working conditions of multiple cable loops in one test. By setting up 4 SF6 meter valves 7 on the GIL equipment, the 4 SF6 meter valves 7 are located in the isolation unit 2 ( 3 places) and on the vertical section on one side of the cable terminal 9 (1 place), thereby using the SF6 meter valve 7 to reduce the air chamber processing time of the different circuit cable chambers in the test.

When installing the GIL line, it is necessary to use the multi-function support vehicle 12 to adjust the height of the GIL. During the installation process of the multi-function support vehicle 12, a high-precision level is used for calibration, thereby preventing the multi-function support vehicle 12 from tilting and affecting the GIL. security.

Disassemble or install GIL units of corresponding lengths according to the spacing of different test cables. The axial error generated when the GIL is connected to the GIS8 and cable terminal 9 can be adjusted through the expansion joint 6 in the standard combination module 1. The axial installation Error (the maximum error can be absorbed is 130mm), which improves the installation efficiency and saves installation time. GIL can use adjustable contacts when connecting to the cable terminal 9, so that the adjustable contacts can be rotated at any angle to adjust the installation process. error.

After the GIL equipment is installed, and adopts the form of gas insulated metal sealing, the insulating gas uses SF ₆ , and then passes through the SF6 meter valve 7 set near the partition 5 (3 locations) and on the vertical section (1 location), A vacuum interface and an inflation interface are provided on the SF6 meter valve 7, so that the entire line can be vacuumed and inflated. When performing a voltage test on the cable, the isolation switch of GIS8 should be disconnected. status, the grounding switch is in the closed state, then connect the GIL to the cable head from the flange port on the upper side of the cable terminal 9, and then install a shielding cover on the basin insulator on the GIS8 side to shield the external electromagnetic waves from the internal resistance The influence of the voltage test work and the outward radiation of electromagnetic waves generated internally ensure the safe operation of the equipment. After the docking is completed, the voltage resistance test of the high-voltage cable of a certain loop can be carried out through the GIL side. At this time, A, B, C three-phase high-voltage cable test can be converted through the standard combination module 1 while the position of the partition 5 remains unchanged.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The directions indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" etc. or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can, within the technical scope disclosed in the present invention, implement the technical solutions of the present invention. Equivalent substitutions or changes of the inventive concept thereof shall be included in the protection scope of the present invention.

Claims (8)

1. A GIL equipment for cable commutation withstand voltage test, including a standard combination module (1), an isolation unit (2), a straight section unit (3) and a right-angle unit (4), characterized in that the standard The combined module (1) consists of two isolation units (2), a right-angle unit (4) and a telescopic section (6). One end of the straight unit (3) is connected to the isolation unit (2) , the isolation unit (2) includes a partition port (5) and an SF6 meter valve (7); One end of the partition opening (5) is connected to the straight section unit (3), one end of the isolation unit (2) is connected to a butt sleeve (13), and one end of the butt sleeve (13) is connected to a cable. Terminal (9), a GIS (8) is provided between the docking sleeve (13) and the cable terminal (9), the GIS (8) and the cable terminal (9) are both in operation before the test; One end of the right-angle unit (4) is connected to a docking cable (14), the side of the docking cable (14) away from the right-angle unit (4) is connected to GIL equipment, and one end of the GIL equipment is connected to a high-voltage composite bushing. (10), the other end is connected to the GIS (8), and a pressure-resistant equipment (11) is placed near the high-voltage composite casing (10). 2. A kind of GIL equipment for cable commutation withstand voltage test according to claim 1, characterized in that, the GIL equipment is provided with several SF6 meter valves (7), wherein three SF6 meter valves (7) 7) It is arranged on the isolation unit (2), and one is arranged on the vertical section on the side of the cable terminal (9). There are three SF6 meter valves (7) and the isolation port (5) near the partition port (5). ) is provided with an SF6 meter valve (7) on the vertical section, and the SF6 meter valve (7) provided on the partition (5) is provided with a vacuum interface and an inflation interface. 3. A GIL equipment for cable commutation withstand voltage test according to claim 1, characterized in that the number of said expansion joints (6) is one, which is used to adjust the axial error during equipment installation. 4. A kind of GIL equipment for cable commutation withstand voltage test according to claim 1, characterized in that a multi-functional support vehicle (12) is provided at the bottom of the GIL equipment, and the multi-functional support vehicle (12) 12) Used to support the entire GIL equipment. 5. A GIL equipment for cable commutation withstand voltage test according to claim 4, characterized in that a hydraulic cylinder is provided inside the multi-functional support vehicle (12), and the hydraulic cylinder is used for adjusting Installation height of GIL equipment. 6. A GIL equipment for cable commutation withstand voltage test according to claim 4, characterized in that the bottom of the multi-functional support vehicle (12) is provided with four universal wheels, and the universal wheels The wheels are used for position adjustment during equipment installation and for lifting and lowering at the same time. 7. A GIL equipment for cable commutation withstand voltage testing according to claim 1, characterized in that one end of the partition port (5) is connected to three-phase high-voltage cable testing of A, B and C. 8. A GIL equipment for cable commutation withstand voltage test according to claim 1, characterized in that one end of the cable terminal (9) is connected with an adjustable contact, and the adjustable contact can Rotate at any angle, and a contact finger is connected between the adjustable contact and the cable terminal (9).