WO2011157046A1

WO2011157046A1 - Method for simulating very fast transient overvoltage generation in gas insulated switchgear (gis) transformer substation and test loop thereof

Info

Publication number: WO2011157046A1
Application number: PCT/CN2011/000386
Authority: WO
Inventors: 陈维江; 戴敏; 谷定燮; 林集明; 吴军辉; 周沛洪; 陈国强; 李振强; 韩彬; 何慧雯; 李文艺
Original assignee: 国网电力科学研究院; 国家电网公司; 中国电力科学研究院; 河南平高电气股份有限公司
Priority date: 2010-06-17
Filing date: 2011-03-11
Publication date: 2011-12-22
Also published as: CN101881813B; CN101881813A; JP2013529053A; JP5813759B2

Abstract

A method for simulating very fast transient overvoltage（VFTO）generation in a gas insulated switchgear (GIS) transformer substation and a test loop thereof are provided. The test loop includes a first isolating switch device (21), a second isolating switch device (22), a first isolating pipe sleeve (23), and a second isolating pipe sleeve (24). One end of the first isolating switch device (21) is connected with one end of the second isolating switch device (22) via a pipeline, and the other end of the first isolating switch device (21) is connected with one end of the first isolating pipe sleeve (23) via a pipeline, and the other end of the second isolating switch device (22) is connected with one end of the second isolating pipe sleeve (24) via a pipeline. The test loop also includes a branch bus (25), and one end of the branch bus (25) is connected to the pipeline between the first isolating switch device (21) and the first isolating pipe sleeve (23), and the other end is floating. The VFTO waveform appearing at the isolating switch broken port and the GIS pipeline in different GIS wire connecting modes in the GIS transformer substation is simulated by changing the length of the branch bus (25).

Description

Method and test loop for generating extremely fast transient overvoltage in a simulated G I S substation

The invention relates to the field of electric power technology, in particular to a method and a test circuit for simulating a transient fast overvoltage generated in a gas insulated metal-enclosed switchgear GIS substation through a test loop. Background technique

With the development of power technology, at present, the power industry standard GB1985-89 (AC high-voltage isolating switch and grounding switch) clearly stipulates that the isolating switch in the gas insulated metal-enclosed switchgear (GI$, Gas Insulated Switchgear) must be opened. A small capacitive current test method is recommended, and a test circuit is recommended to test the ability of the isolation switch to close and break a small capacitive current.

As shown in Figure 1, it is a schematic diagram of the test circuit of the isolation switch in the prior art. In Figure 1, U1 represents the power supply voltage, and the AC voltage amplitude should be U/^ times the rated voltage during the test; _C1 is the power supply side. The additional concentrated capacitor can be selected according to the standard GB1985-89; U2 represents the negative side power supply, and the negative DC voltage is selected during the test, and the amplitude is the rated voltage. DT represents the test isolating switch, and DA represents the auxiliary isolating switch. Dl represents the distance from the DT's split contact to the end of the bushing; d2 represents the distance from the DT's trip contact to the DA's trip contact. In order to obtain a typical very fast transient (VFT, Very Fast Transient) ^ H = | S ratio d2 / dl should be in the range of 0.36 - 0.52.

The purpose of the test wiring circuit recommended by the standard GB1985-89 is to evaluate the opening and closing small current capability of the isolating switch, so it is only necessary to generate a very fast transient voltage (VFTO, Very Fast Transient Voltage). The waveform of the VFTO generated under this condition is different from the VFTO appearing in the UHV GIS substation. Waveform, and it is difficult to determine whether the VFTO amplitude is the largest in the project. The VFTO appearing in the UHV GIS substation is caused by multiple refractions and reflections of the voltage wave at the discontinuity of the wave impedance. When the difference of the GIS wiring mode causes the isolation switch of different positions to operate, the maximum amplitude of the VFTO appears. Uncertainty.

Therefore, the current power industry standard proposed in the GIS isolation switch must be opened and closed a small capacitive current test loop can not truly reflect the VFTO waveform appearing in the UHV GIS substation, the resulting VFTO maximum position is basically fixed, That is, on the break of the disconnecting switch.

In the research and practice of the prior art, the inventors of the present invention have found that in the existing implementation, when the isolation switch is operated in the GIS substation, the maximum VFTO generated does not necessarily appear at the fracture of the isolating switch. It may appear at a certain point on the busbar. For this situation, the test loop proposed by the current power industry standard cannot fully simulate and measure the VFTO waveform appearing in the GIS substation, which has very limited limitations. Summary of the invention

Embodiments of the present invention provide a method and a test loop for generating a very fast transient overvoltage in a gas insulated metal-enclosed switchgear GIS substation through a test loop to simulate a VFTO appearing on a disconnector of a switchgear and a GIS pipeline in a GIS substation Waveform.

To this end, the present invention provides a method for simulating a very fast transient overvoltage in a gas insulated metal-enclosed switchgear GIS substation through a test loop, the method comprising:

a branch bus is connected to the pipe between the first isolation switch device and the first isolation sleeve in the test circuit;

Change the length of the branch bus, simulate different GIS in GIS substation A very fast transient overvoltage generated in the test circuit when the first isolating switch device and the second isolating switch device connected thereto are respectively operated in the wiring mode.

The branch bus bar is a fixed length branch bus bar; or an adjustable branch bus bar; wherein the branch bus bar is a gas insulated metal-enclosed switch device GIS pipe.

Optionally, the first isolating switch device is an isolated isolating switch DS1 device, and the second isolating switch device is an auxiliary isolating switch DA device, wherein the first isolating sleeve is a sleeve connected to a power source, and The second isolation sleeve connected to the second isolation switch device is a sleeve connected to the load; or

The first isolating switch device is an isolated isolating switch DA device, and the second isolating switch device is an auxiliary isolating switch DS1 device. The first isolating sleeve is a sleeve connected to a power source, and is connected to the second isolating switch device. The second isolation sleeve is a sleeve that connects the load; or

The first isolating switch device is an auxiliary isolating switch DS1 device, the second isolating switch device is an isolated isolating switch DA device, and the first isolating sleeve is a sleeve connected to the load, and is connected to the second isolating switch device The second isolation sleeve is a sleeve that is connected to the power source.

Optionally, the DS1 device has a switching resistor; the DA device does not have a switching resistor.

Correspondingly, the present invention provides a test circuit, including: a first isolation switch device, a second isolation switch device, a first isolation sleeve, and a second isolation sleeve; wherein, one end of the first isolation switch device passes through a pipeline Connected to one end of the second isolating switch device, the other end of the first isolating switch device is connected to one end of the first isolating sleeve through a pipe, and the other end of the second isolating switch device is connected to the The second isolation sleeve is connected to one end, and further includes: a branch busbar, one end of the branch busbar is connected to the pipeline between the first isolation switch device and the first isolation sleeve, and the other end is suspended Changing the length of the branch bus Simulate very fast transient overvoltages generated by different GIS wiring modes in GIS substations.

Optionally, one end of the branch busbar is connected to the pipeline between the first isolating switch device and the first isolating sleeve: the card is connected, butted, or connected by a nut.

Optionally, the branch busbar is a gas insulated metal-enclosed switchgear GIS pipe, and the length of the GIS pipe is 3 m, 6 m or 9 m.

Optionally, the branch bus bar is an adjustable GIS pipe, and the adjustable GIS pipe has a length of 2m to 10m.

Optionally, the first isolating switch device is an isolating switch DS1 device, the second isolating switch device is an auxiliary isolating switch DA device, the first isolating sleeve is a casing connected to a power source, and the second isolating sleeve is The first isolating switch device is an isolated isolating switch DA1 device, and the second isolating switch device is an auxiliary isolating switch DS1 device. , the second isolation sleeve is a sleeve connected to the load; or

The first isolating switch device is an auxiliary isolating switch DS1 device, the second isolating switch device is an isolated isolating switch DA device, the first isolating sleeve is a sleeve connected to the load, and the second isolating sleeve is connected The casing of the power supply.

Optionally, the length of the pipeline between the DS1 device and the DA device is 5.27m to 7.27m;

The length of the pipe between one end of the branch busbar and the first isolation switch device is: 1.245m to 3.245m;

The length of the pipe between one end of the branch busbar and the first isolating sleeve is obtained by simulation, and is: 10.6m to 12.6m.

Optionally, the other end of the first isolating switch device is connected to the first One end of the isolation sleeve is connected to: the other end of the first isolation switch device is connected to one end of the first isolation sleeve through an L-shaped pipe;

The other end of the second isolating switch device is connected to one end of the second isolating sleeve through a pipe. The other end of the second isolating switch device is connected to one end of the second insulating sleeve through an L-shaped pipe. .

Optionally, the corner of the L-shaped pipe is detachable.

It can be seen from the above technical solution that the test circuit proposed by the present invention can simulate the ultra-fast transient over-voltage (VFTO) waveform generated when the isolating switch operation is performed under various wiring modes of the ultra-high voltage substation. The invention connects the branch busbar between the first isolation switch device and the power supply side bushing (that is, the structure with the branch of the test circuit), and simulates the different GIS wiring modes in the GIS substation by changing the length of the branch bus bar. A VFTO generated on a pipe between the first isolation switch device and the second isolation switch device.

Further, in the present invention, there are certain requirements on the length of the pipe between the various devices of the test circuit, such as the length of the pipe between DS1 and DA, the length of the pipe between DS1 and BG1, and the length of the pipe of the branch bus;

Further, in order to facilitate the disassembly and assembly of the equipment, the test circuit is an "L-shaped" structure for facilitating the wiring change. The "L-type" structure allows easy exchange of DS1 and DA positions, or exchanges of power and load for DS1 and DA connections. That is to say, the present invention not only simulates the VFTO appearing on the isolating switch break and the GIS pipe when the test circuit can simulate the operation of the isolating switch in the GIS substation. It is also possible to simulate the VFTO under various operating conditions by changing the structure of the wiring loop. The results measured on the test loop reflect the maximum VFTO that occurs in the project. DRAWINGS

1 is a schematic view of a prior art isolation switch test wiring circuit;

2 is a schematic structural view of a test circuit provided in the present invention; 3 is a schematic structural view of a VFTO measurement test circuit in a UHV substation GIS provided in the present invention;

Figure 4 is a perspective structural view of a test circuit provided in the present invention;

Figure 5A is a front elevational view of the test circuit provided in the present invention;

Figure 5B is a plan view of the test circuit provided in the present invention;

Figure 6 is a schematic view of the disassembly and assembly when the positions of the DS1 and the DA are exchanged in the present invention;

7 is a flow chart of a method for simulating a transient fast overvoltage generated in a gas insulated metal enclosed switchgear GIS substation by a test loop according to the present invention. detailed description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

2 is a schematic structural diagram of a test circuit provided in the present invention; the test circuit includes: a first isolation switch device 21, a second isolation switch device 22, a first isolation sleeve 23, and a second isolation sleeve And a branch bus bar 25; wherein one end of the first isolating switch device 21 is connected to one end of the second isolating switch device 22 through a pipe, and the other end of the first isolating switch device 21 is connected to the first An isolation sleeve 23 is connected to the end, and the other end of the second isolation switch device 22 is connected to one end of the second isolation sleeve 24 through a pipe. One end of the branch bus 25 is connected to the first isolation switch. On the pipeline between the equipment 21 and the first isolation sleeve 23, the other end of the branch busbar is suspended, and the different GIS connection modes in the GIS substation are simulated by changing the length of the branch busbar.

A very fast transient overvoltage generated under (i.e., a different test loop), i.e., a VFTO generated between the first isolation switch device and the second isolation switch device.

Test circuit and UHV gas insulated metal-enclosed switch device proposed by the invention

(GIS, Gas Insulated Switchgear) Isolation Switchgear in Substation (For example, the first isolating switchgear and/or the second isolating switchgear, etc., the same below) The wiring mode during operation is basically the same, and the ultra-transient transient generated by the operation of the isolating switchgear in the UHV GIS substation can be truly reproduced. Waveform of voltage (VFTO). That is to say, by using the test circuit of the technical solution of the present invention, it is possible to simulate the VFTO waveform appearing on the disconnection of the isolation switch device and the GIS pipe in the GIS substation when the isolating switch device is operated. In addition, the test circuit combines the dimensions of the actual GIS substation in the project. The measured results on the test loop can reflect the maximum VFTO voltage appearing in the project, and the test loop structure can be changed by the branch bus, thus simulating different GIS substations. The voltage of the VFTO generated between the isolating switch devices under the GIS wiring mode.

Optionally, one end of the branch busbar is connected to the pipeline between the first isolating switch device and the first isolating sleeve: the card is connected, butted, or connected by a nut. Or a standard connection between devices in a GIS substation.

Optionally, the branch busbar is a gas insulated metal-enclosed switchgear GIS pipe, but is not limited thereto. Generally, the length of the GIS pipe may be 3 m, 6 m or 9 m, but not limited thereto, and may also be based on the distance between the first isolating switch device and the second isolating switch device, and the first isolation The distance between the switchgear and the split busbar is adaptively modified, which is not limited in this embodiment.

Optionally, the branch bus bar can also be a two-segment GIS pipe. Generally, the length of each GIS pipe is 3 m and 6 m, respectively, and of course, the adaptability can be modified, and the embodiment does not limit; The branch busbar can also be an adjustable GIS pipe, such as an adjustable two-stage GIS pipe, or an adjustable three-section GIS pipe, etc., wherein the length of the adjustable GIS pipe is generally 2m to 10m. However, it is also possible to perform adaptive modification in an actual application, which is not limited in this embodiment.

Optionally, when the first isolating switch device is operated by the isolating switch DS1 device, the second isolating switch device is an auxiliary isolating switch DA device, and the first is The sleeve is a sleeve that is connected to the power source, and the second sleeve is a sleeve that connects the load; or

The first isolating switch device is an isolated isolating switch DA device, the second isolating switch device is an auxiliary isolating switch DS1 device, the first isolating sleeve is a casing connected to a power source, and the second isolating The sleeve is a sleeve that connects the load; or

The first isolating switch device is an auxiliary isolating switch DS1 device, the second isolating switch device is an isolated isolating switch DA device, the first isolating sleeve is a sleeve for connecting a load, and the second isolating The sleeve is a sleeve that is connected to a power source.

The length of the pipe between one end of the branch busbar to the first isolating switch device is: 1.245 m to 3.245 m. It can be determined according to the minimum length of the first isolation switch device and the branch bus.

Optionally, the length of the pipe between one end of the branch busbar and the first isolation pipe sleeve is obtained by simulation, and is: 10.6m to 12.6m.

Optionally, a length between the first isolation switch device and one end of the branch bus bar connected to the pipeline between the first isolation switch device and the first isolation switch sleeve may be: 1.245 m to 3.245 m, In general, it is 2.245m; or, it is 3.475m to 5.475m, and is generally 4.475m. However, it is not limited to this, and can be modified according to the actual application.

Optionally, in order to facilitate the change of the wiring in the test circuit, the other end of the first isolating switch device is connected to one end of the first isolating sleeve through a pipe, and the other end of the first isolating switch device passes through the L. a type of pipe is connected to one end of the first isolation sleeve; The other end of the second isolating switch device is connected to one end of the second isolating sleeve through a pipe. The other end of the second isolating switch device is connected to one end of the second isolating sleeve through an L-shaped pipe. . Wherein, the corner of the L-shaped pipe is detachable.

The test circuit proposed by the present invention is different from the test circuit recommended by the standard. The structure of the test circuit in the present invention can simulate the VFTO generated when the isolating switch operation is performed under various wiring modes of the UHV substation. The invention connects the branch busbar between the DS1 device and the power supply side bushing (that is, the structure with the branch of the test circuit), and simulates the different GIS wiring modes in the GIS substation by changing the length of the branch bus bar. A transient overvoltage generated between the DS1 device and the DA device. At the same time, in the present invention, there are certain requirements on the size of the test circuit, such as the length of the pipe between DS1 and DA, the length of the pipe between DS1 and BG1, the length of the pipe of the branch bus, etc.; The test circuit is an "L-shaped" structure that is used to facilitate wiring. The "L-shaped" structure makes it easy to exchange the DS1 and DA positions or connect them to the power supply and load. That is to say, the present invention not only simulates the VFTO appearing on the isolating switch break and the GIS pipe when the test circuit can simulate the operation of the isolating switch in the GIS substation. It is also possible to simulate the VFTO of various operating conditions by changing the structure of the wiring circuit. The results measured on the test circuit reflect the maximum VFTO that occurs in the project.

In order to facilitate the understanding of those skilled in the art, the following is a specific application example.

Please refer to FIG. 3 , which is a schematic structural diagram of a VFTO measurement test circuit in a UHV substation GIS according to the present invention. In this embodiment, the first isolating switch device is operated by the isolating switch DS1 and the second isolating switch. For example, the auxiliary isolation switch DA, the first isolation sleeve BG1 is connected to the power supply side, and the second isolation sleeve BG2 is connected to the load side. The branch bus is exemplified by M1 and M2, but is not limited thereto. In the middle, the DS1 and DA positions can also be interchanged, that is, the first partition The switchgear is an isolated disconnector DA device, the second isolating switchgear is an auxiliary isolating switch DS1 device, the first isolating sleeve is a bushing connected to the power source, and the second isolating device is connected to the second isolating switch device The sleeve is a sleeve that connects the load. It is also possible that the first isolating switch device is an auxiliary isolating switch DS1 device, the second isolating switch device is an operated isolating switch DA device, and the first isolating sleeve is a sleeve connected to the load, and is separated from the second The second isolation sleeve connected to the switch device is a sleeve connected to the power source. The implementation process is similar, as detailed below.

As shown in Figure 3, the body of the test circuit is this part between BG1 and BG2. In this embodiment, U1 represents the power supply voltage, and the amplitude of the AC voltage should be U/^ times the rated voltage during the test; ci is the additional concentrated capacitor on the power supply side, and the value can be selected according to the provisions of the standard GB1985-89; U2 represents the load side voltage. The negative DC voltage is selected during the test, and the amplitude is U x ^ / times the rated voltage. BG1 and BG2 are the UHV bushings on the power supply side and the load side respectively. In this embodiment, DS1 is operated. Isolation switch, DA is auxiliary isolation switch, which are collectively referred to as GIS isolation switch. DS1 can be equipped with switching resistor, DA is not equipped with switching resistor, and other parts of the test circuit are GIS pipeline. The size of each device in the test circuit is the size of the UHV GIS device, and the size of each device varies from manufacturer to manufacturer. The connections between their devices are connected according to the standards between GIS devices.

In the present invention, a DS1 with a switching resistor can also be used, which is intended to be used to study the limiting measures of the VFTO. In the present invention, the maximum value of the VFTO generated in different GIS wiring modes in the GIS substation can also be simulated by changing the length of the branch bus. Specifically, as shown in FIG. 3, the present invention connects a branch busbar on the pipeline between BG1 and DS1, and simulates the VFTO generated under different GIS wiring modes (ie different test loops) in the GIS substation by changing the length of the branch busbar. The maximum value.

According to the actual structure of China's UHV GIS substation, this J3⁄4L Ming proposed that the electrical connection length of the DS1 and DA sections is 6.27m. The length of the original selection Then: The electrical length between the isolating switch and the circuit breaker break in China's UHV substation is basically the same. The distance between the isolating switch of the UHV substation and the breaker breakage in China is roughly between 6m and 7m. The length of the following pipes refers to the length of the electrical connection.

For the lengths of the DS1 and M1 sections, the minimum length of the DS1 isolating switch and branch circuit in the substation and the minimum requirement of the GIS equipment itself are 2.245m, but it is not limited thereto, and can be adapted according to the actual application. Sexual modifications, the invention is not limited.

The length of Ml and BG1 can be obtained by simulation calculation. During the simulation, the length of the BG1 and M1 sections and the length of the M1 and M2 sections are used as variables. The length of the pipelines in the BG1 and M1 sections is 11.6m, and the length of the M1 and M2 sections is 9m. The maximum VFTO can appear in the GIS isolation switch. The calculation process is as follows: The calculation is performed by the EMTP electromagnetic transient calculation program. The length of the BG1 and M1 sections is used as the fixed value, and the M1 and M2 sections are changed. Length, get a series of calculation results; then change the length of the BG1 and Ml section pipelines, take a value, still use it as the fixed value, then change the length of the Ml and M2 section pipelines, and get a series of calculation results...-, The maximum value of these calculation results is selected. The length of the corresponding BG1 and M1 pipes is 11.6m, and the length of the M1 and M2 pipes is 9m.

In this test, the length of the BG1 and M1 sections refers to the length of the end of Ml to BG1, and BG1 acts as a casing, and the length itself is 13.15m. Since the test circuit is mainly used to measure the VFTO generated when the AC power supply side (U1 side) isolating switch operation, the GIS length of the DC power supply side (U2 side) is not required, that is, the length of the DA and BG2 pipe is not required. Can be freely chosen by the tester. The length of DA and BG2 recommended by the present invention is 4.475 m. The operation steps of the measurement test are mainly as follows: First, determine the opening position where DS1 and DA are located; then, change the length of the branch bus, and simulate different GIS wiring modes in the GIS substation, For example, changing the length of the branch busbar to 3 meters, that is, the test loop structure of the branch busbar of the DS1 with 3 meters; then, first closing the DA, bringing the DC voltage between the DS1 and the DA, and then disconnecting the DA; DS1, VFTO is generated between DSl and DA in the test circuit; DS1 is disconnected to generate VFTO in the test circuit; one measurement is completed. That is to say, during the measurement, the VFTO generated in the test circuit can be simulated under different GIS wiring modes in the GIS substation by changing the length of the branch busbar, so as to reflect the result of the measurement on the test circuit. The maximum VFTO voltage that appears.

The test circuit of the present invention can not only measure the maximum VFTO, but also the influence of the loop structure on the VFTO. When GIS is used in China's UHV substation, when the GIS disconnector breaks and closes the busbar section (ie GIS pipe), the length of the busbar section is included in the range of 3m~9m. When the test circuit of the present invention is used to study the influence of the test circuit on the VFTO, the lengths of the branch bus M1 and M2 pipes can be adjusted. The length of the branch busbar can be adjusted to the representative 0m, 3m, 6m and 3m+6m according to the GIS wiring characteristics of the UHV substation, but it is not limited to this, and can be adjusted according to the actual application, such as 10 , 15 or 20, etc. Among them, the branch bus is composed of two GIS pipes, and the length is 3m and 6m respectively, which is not limited thereto. When the branch busbar is not connected to the test circuit, that is, the length of the branch busbar is 0m, the test circuit proposed by the present invention is the isolation switch test wiring loop recommended by the standard GB1985-89.

The test circuit of the present invention can simultaneously study the limiting measures of the VFTO. In the test circuit, the DS1 is equipped with a shunt resistor and the DA is not equipped with a shunt resistor. If the circuit is connected according to the connection shown in Figure 3, the DS1 can be operated to measure the VFTO waveform with limiting measures (the limiting measure is the isolating switch with the closing and closing resistor). The position of DS1 and DA is exchanged, and VFTO is generated by operating DA to measure the VFTO waveform when no limiting measures are taken. Specifically, as shown in FIG. 4, it is a perspective structural view of the test circuit provided in the present invention. In the present invention, the loop connection of the test circuit can be changed. The change loop wiring actually includes two independent events of changing the length of the branch bus and exchanging the positions of the DS1 and the DA. In the present invention, the positions of the DS1 and the DA can be exchanged. In the above embodiment, it is also possible to exchange the positions of the power source and the load connected to the DS1 and the DA, that is, the power source is connected to the DA, the load is connected to the DS1, and the DA is operated. The purpose of the exchange is to study the VFTO when the DS1 has a shunt resistor or the DA does not have a shunt resistor by operating a different DS1 or DA.

In order to facilitate the disassembly and assembly of various equipment (such as DS1 and DA) in the test circuit, the M1 and BG1 sections of the pipeline and the DA and BG2 sections of the pipeline are connected by "L". When exchanging the positions of DS1 and DA, it can be dismantled from the "L-shaped" corner, and the I, II, ΠΙ, IV parts are removed in order to avoid the removal and re-installation of the test circuit, as shown in Figure 5Α and Figure 5Β. 5A and 5B are respectively a front view and a top view of the test circuit provided in the present invention.

The process of reinstalling the test circuit after removal is to install IV, III, II, and I in sequence. Specifically, as shown in FIG. 6, it is a schematic diagram of disassembly and assembly when the positions of DS1 and DA are exchanged in the present invention.

Based on the implementation process of the above test loop, the present invention also provides a method for simulating a transient fast overvoltage generated in a gas insulated metal-enclosed switchgear GIS substation through a test loop. The flow chart is shown in FIG. 7, and the method includes:

Step 701: connecting a branch bus bar to a pipeline between the first isolation switch device and the first isolation sleeve in the test circuit;

Step 701: Changing the length of the branch busbar, simulating the extra-transient transient generated in the test loop when the first isolation switch device and the second isolation switch device connected thereto are respectively operated under different GIS connection modes in the GIS substation Voltage.

Optionally, the branch bus bar is a fixed length branch bus bar; or an adjustable branch bus bar. Optionally, the branch busbar is a gas insulated metal-enclosed switchgear GIS pipeline.

Optionally, the first isolating switch device is an isolated isolating switch DS1 device, and the second isolating switch device is an auxiliary isolating switch DA device. a sleeve, the second isolating sleeve connected to the second isolating switch device is a sleeve connected to the load; or

For the implementation process of each step in the method, refer to the corresponding implementation process in the above test loop, and details are not described herein again.

The test circuit proposed by the invention is basically identical to the wiring mode of the UHV GIS substation isolation switch, and can truly reproduce the VFTO generated by the isolation switch operation in the UHV GIS substation. The advantage is that it can simulate the VFTO appearing on the disconnector of the isolation switch and the GIS pipe when the isolation switch in the GIS substation is operated. At the same time, the test loop combines the actual substation dimensions in the project, and the results measured on the test loop reflect the maximum VFTO that appears in the project.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Base In this understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. , optical discs, etc., including thousands of instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The description of the present invention has been presented for purposes of illustration and description. Many modifications and variations will be apparent to those skilled in the art. The embodiment was chosen and described in order to explain the principles of the invention and the embodiments of the invention

Claims

Rights request

1. A method for simulating a gas-insulated metal-enclosed switchgear through a test loop to generate a very fast transient overvoltage in a GIS substation, characterized in that the method comprises:

The length of the branch busbar is changed to simulate the extremely fast transient overvoltage generated in the test circuit when the first isolating switch device and the second isolating switch device connected thereto are operated under different GIS wiring modes in the GIS substation.

2. The method according to claim 1, wherein the branch bus is a fixed length branch bus; or an adjustable branch bus; wherein the branch bus is a gas insulated metal-enclosed switch device GIS pipe.

The method according to claim 1 or 2, wherein the first isolating switch device is an isolated isolating switch DS1 device, and the second isolating switch device is an auxiliary isolating switch DA device, The first isolation sleeve is a sleeve connected to the power source, and the second isolation sleeve connected to the second isolation switch device is a sleeve connected to the load; or

The first isolating switch device is an isolated isolating switch DA device, and the second isolating switch device is an auxiliary isolating switch DS1 device. The first isolating sleeve is a sleeve connected to a power source, and is connected to the second isolating switch device. The second isolation sleeve is a sleeve for connecting the load; or

4. The method according to claim 3, wherein said DS1 is set The backup device has a switching resistor; the DA device does not have a switching resistor.

A test circuit, comprising: a first isolation switch device, a second isolation switch device, a first isolation sleeve, and a second isolation sleeve; wherein: one end of the first isolation switch device passes through the pipeline and the first One end of the second isolating switch device is connected to the other end of the first isolating switch device, and the other end of the second isolating switch device is connected to the second isolating tube through a pipe. One end of the sleeve is connected, and further includes: a branch bus bar, one end of the branch bus bar is connected to the pipe between the first isolating switch device and the first isolating sleeve, and the other end is suspended, by changing the The length of the branch bus is used to simulate the very fast transient overvoltage generated by the different 018 3⁄4" line modes in the GIS substation.

The test circuit according to claim 5, wherein one end of the branch bus bar is connected to the pipe between the first isolating switch device and the first isolating sleeve: Dock or connect with a screw and nut.

7. The test circuit according to claim 5, wherein the branch bus is a gas insulated metal-enclosed switchgear GIS pipe; the length of the GIS pipe is 3 m, 6 m or 9 m.

8. The test circuit according to claim 5, wherein the branch bus is an adjustable GIS pipe, and the adjustable GIS pipe has a length of 2 m to 10 m.

The test circuit according to claim 5, wherein the first isolating switch device is an isolating switch DS1 device, and the second isolating switch device is an auxiliary isolating switch DA device, and the first isolating sleeve In order to connect the power supply sleeve, the second isolation sleeve is a sleeve for connecting the load; or

The first isolating switch device is an isolated isolating switch DA device, the second isolating switch device is an auxiliary isolating switch DS1 device, the first isolating sleeve is a casing connected to a power source, and the second isolating The sleeve is a sleeve that connects the load; or The first isolating switch device is an auxiliary isolating switch DS1 device, the second isolating switch device is an isolated isolating switch DA device, the first isolating sleeve is a sleeve for connecting a load, and the second isolating The sleeve is a sleeve that is connected to a power source.

The test circuit according to claim 9, wherein the length of the pipe between the DS1 device and the DA device is 5.27m to 7.27m;

The length of the pipe between one end of the branch busbar to the first isolating switch device is: 1.245 m to 3.245 m;

11. The test circuit according to claim 9, wherein the DS1 device has a switching resistor; the DA device does not have a switching resistor.

The test circuit according to any one of claims 5 to 11, wherein the other end of the first isolating switch device is connected to one end of the first isolating sleeve through a pipe, and the first The other end of the isolating switch device is connected to one end of the first isolating sleeve through an L-shaped pipe;

The other end of the second isolating switch device is connected to one end of the second isolating sleeve through a pipe. The other end of the second isolating switch device is connected to one end of the second isolating sleeve through an L-shaped pipe. .

13. The test circuit according to claim 12, wherein the corner of the L-shaped pipe is detachable.