WO2017088307A1

WO2017088307A1 - High-voltage dc support insulator test apparatus, test system and test method

Info

Publication number: WO2017088307A1
Application number: PCT/CN2016/073113
Authority: WO
Inventors: 刘泽洪; 柴影辉; 钟建英; 张友鹏; 段晓辉; 王文博; �田�浩; 李继承; 张柳丽; 孙英杰; 杜迎乾; 董祥渊
Original assignee: 国家电网公司; 平高集团有限公司
Priority date: 2015-11-27
Filing date: 2016-02-01
Publication date: 2017-06-01
Also published as: CN105606850A; CN105606850B; CN105606851A; CN105606851B

Abstract

A high-voltage DC support insulator test apparatus, test system and test method. The high-voltage DC support insulator test apparatus comprises an enclosed test container (12), wherein the test container (12) is provided with a group of test seats (20) used for mounting a tested DC support insulator (101) and a common power supply apparatus (18) used for providing a test voltage to the tested DC support insulator (101). The test apparatus further comprises disconnection apparatuses (21, 27, 28, 29) corresponding to the test seats (20) and used for disconnecting the common power supply apparatus (18) and the corresponding tested DC support insulator (101) under set conditions. The characteristics of the DC support insulator (101) can be learnt more accurately by testing a group of DC support insulators (101) under the same conditions, thereby improving the accuracy of a test result of the DC support insulators (101).

Description

High-voltage direct current support insulator test device, test system and test method

Technical field

The invention relates to the field of high voltage direct current support insulator test, in particular to a high voltage direct current support insulator test device, test system and test method.

Background technique

Compared with AC transmission, HVDC has the advantages of strong transmission capacity, small line loss, no need for synchronous operation on both sides of the long-distance transmission, and low loss of faults. It is the focus of future transmission line construction. However, under DC conditions, the electric field has unidirectional stability, and the charge accumulation effect occurs in the insulating material, so that the insulation and flashover characteristics are very different from those under AC conditions, and the resulting breakdown or discharge is more severe than under AC conditions. To be serious, it directly affects the reliability of the HVDC transmission system. This effect is more pronounced for internal insulation components such as epoxy cast insulators.

Research on DC internal insulation at home and abroad mainly focuses on surface charge accumulation and electric field optimization of epoxy cast insulators. At present, the overall performance of the insulator is improved mainly by optimizing the design of the insulator structure and improving the casting process. In foreign countries, ABB and other companies have conducted research on DC support insulators, but the insulation materials and components used for internal insulation have not been reported. The ±500kV DC GIS jointly developed by Japan's Hitachi, Kansai Electric Power, Shikoku Electric Power Co., and Power Development Co., Ltd. has been put into trial operation, but it is modified on the basis of the original AC GIS. Its insulators use AC insulators. . At present, at present, only DC through-wall bushings need to use DC supporting insulators. In recent years, research on flashover characteristics of DC supporting insulators has gradually increased, mainly in Xi'an Jiaotong University, Hunan University and Tsinghua University.

However, the current research on the flashover characteristics of DC support insulators is based on the experimental study of individual DC support insulators. There are differences in the test conditions for each test, which will bring deviations to the test results to a certain extent. The characteristics of the DC support insulators cannot be accurately grasped through the test.

Summary of the invention

It is an object of the present invention to provide a high voltage direct current support insulator test apparatus for improving the accuracy of test results of a direct current support insulator.

At the same time, the object of the present invention is to provide a high voltage direct current support insulator test system and test method.

In order to achieve the above object, the high voltage direct current support insulator test device of the present invention adopts the following technical solution: a high voltage direct current support insulator test device, including a sealed test container, wherein the test container is provided with a set of test positions for mounting the test DC support insulator. And a common power supply device for providing a test voltage to the DC support insulator of the test, the test device further comprising: corresponding to the test position, for disconnecting the common power supply device and the corresponding DC support insulator under the set condition Disconnect device.

The common power supply device includes a conductive rod, and the conductive rod is provided with a contact power supply portion for contacting the tested DC support insulator on each test position during the test.

The test position is provided at a radial side of the conductive rod.

A DC partial discharge measuring device for measuring partial discharge during the test is provided in the test vessel.

The breaking device includes a driving rod for driving the tested DC supporting insulator to be connected or disconnected with the common power supply device in a straight line, and one end of the driving rod extends into the test container and is sealingly fitted with the test container.

The test position is disposed between an end of the drive rod that projects into the test vessel and the common power supply.

The disconnecting device further includes a threaded device mounted on the test vessel, the drive rod having a threaded section corresponding to the threaded device, and the threaded device and the drive rod together forming a screw nut mechanism.

The test container includes a cover, one end of the drive rod extends through the corresponding cover and into the test container, and a section of the drive rod that cooperates with the corresponding cover is a cylindrical light rod section, and the polished rod section and the cover pass The sealing device provided between the two is sealed and matched.

The silk master device includes a bracket and a silk nut disposed on the bracket, the bracket being mounted outside the corresponding end cap.

The test vessel is further provided with an insulator grounding device for grounding each of the tested DC support insulators in use, and the insulator grounding device is sealingly fitted with the test vessel.

The test container is provided with an operation hole corresponding to the test position for detaching the test DC support insulator to the test position, and the operation hole is sealed by a corresponding cover.

The test container is provided with a charging and discharging port.

The high-voltage DC support insulator test system adopts the following technical scheme: a high-voltage DC support insulator test system, including the above-mentioned high-voltage DC support insulator test device, the test container of the test device is connected with an air suction device, and the system further includes a DC support for monitoring the test. Leakage monitoring device for leakage of insulators.

The test method of high-voltage DC support insulator adopts the following technical scheme: a test method for high-voltage DC support insulator, which is to connect one end of a group of DC support insulators to a common power supply device in the same environment, and the other end is grounded separately, and each DC support insulator is monitored. The leakage method is used to study the characteristics of the DC support insulator. If a set of DC support insulators is found to have a set flashover phenomenon during the monitoring process, it is cut off from the power supply device until all the DC support insulators are tested. Both are cut off with the power supply unit.

During the test, the partial discharge was monitored throughout the process.

The invention has the beneficial effects that: since a set of a plurality of test positions are arranged in a closed container, a group of tested DC support insulators can be tested under the same environment, which first ensures the test environment. Absolute phase At the same time, because the public power supply device is installed, the test voltages received by the tested DC support insulators are the same during the test, which can further ensure the consistency of the test conditions. In addition, the disconnect device can be corresponding under the set conditions. The DC support insulators of the test were disconnected from the common power supply device without affecting the subsequent tests of the other DC support insulators under test. By testing a group of DC support insulators under the same conditions, the characteristics of the DC support insulator can be more accurately grasped, and the accuracy of the test results of the DC support insulator can be improved.

DRAWINGS

1 is a schematic structural view of an embodiment of a high voltage direct current support insulator test apparatus;

Figure 2 is a schematic view of the cooperation of the breaking device and the test container.

detailed description

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

A specific embodiment of the high voltage direct current support insulator test apparatus of the present invention, the high voltage direct current support insulator test apparatus is only a part of the test system, and is equivalent to the installation tool of the tested DC support insulator in the test system for mounting the test subject. The DC supports the insulator and provides a test environment for it. Fig. 1 shows the structure of the high-voltage DC support insulator test apparatus, and the test DC support insulator 101 is also shown in the figure. The device comprises a test container, which is a closed test container, which can be used for vacuuming or filling with an inert gas such as sulfur hexafluoride to meet the needs of the test, so that a charging and discharging port, a charging and discharging port are also arranged thereon. There is a gas nozzle 11 at the place. In the present embodiment, the test container is specifically configured to combine the cylinder 12 and the sleeve 13, and the cylinder 12 is fixedly sealed with the sleeve 13. To ensure the safety of the test, the cylinder is separately grounded.

The cylinder 12 is specifically configured to have a segmented structure including a first vertical cylindrical portion 121 at one end, a second vertical cylindrical portion 122 at the other end, and a flat cylindrical portion 123 connected between the first and second ends. Thereby the cylinder forms an "H" shaped structure. As can be seen from FIG. 1 , the lower part of the cylinder 12 is provided with a support frame 14 , and the support frame 14 and the first and second vertical tube parts of the cylinder 12 are respectively flanged, and a support frame 14 is arranged here. The aspect is to provide a reliable basis for the test device, and on the other hand to make room for the corresponding operation under the cylinder 12 when necessary.

The sleeve 13 is specifically connected to the upper end of the first vertical tubular portion 121, wherein a power supply introduction rod 15 is provided, and the power supply introduction rod 15 is specifically for introducing an external power source to the test container for experimental use.

A first insulating bracket 16 is disposed in the first vertical tubular portion 121, and a second insulating bracket 17 is disposed in the second vertical tubular portion 122. The first insulating bracket 16 and the second insulating bracket 17 erect a conductive rod 18. The conductive rod 18 adopts a three-stage structure, which comprises a support section 181 at both ends and a power supply section 182 between the two support sections. The end of the support section 181 close to the power supply section 182 forms a male end, and both ends of the power supply section 182 A female end corresponding to the male end is formed, and the support section 181 and the power supply section 182 are inserted into each other to form an electrically conductive connection. In order to facilitate the installation of the conductive rod 18, the two vertical tubes of the cylinder Further, operation holes are provided on the first vertical tube portion and the second vertical tube portion, and the operation holes are closed by the column end cover 19 connected to the flange of the barrel body, and can be opened at any time if necessary. An end of the conductive rod 18 close to the first vertical cylindrical portion is connected to the power supply introduction rod 15. The conductive rod 18 is disposed here to provide a test voltage to the tested DC support insulator 101. The contact portion of the conductive rod 18 is provided with five contact power supply portions 1821, and the contact power supply portion 1821 is used for testing and DC. The support insulator 101 is contacted to apply a voltage thereto. Here, five contact power supply units are provided because five test positions 20 are provided in the cylinder, and there is a one-to-one correspondence between the contact power supply portion 1821 and the test position 20, and the test position 20 is used for the test. At the time of installation of the mounting position of the tested DC support insulator, in the present embodiment, the five test positions 20 are distributed at the radial side of the conductive rod. It should be particularly noted here that the number of test bits 20 is not necessarily limited to five, which is specifically determined according to the number of DC support insulators to be tested in a single sub-test, and may be two or more according to actual conditions, of course It is not difficult to see that the conductive rod actually constitutes a common power supply device for each of the tested DC support insulators during the test.

A disconnecting means is also provided on the cylinder 12 in one-to-one correspondence with the test position 20. The function of the disconnecting device is to disconnect the common power supply device and the corresponding DC support insulator under the set conditions. This is also the core of the device. Due to the above-mentioned disconnecting device, during the test, the voltage can be simultaneously applied to the plurality of tested DC supporting insulators through the conductive rod, when a DC support insulator of the tested is flashover phenomenon. By disconnecting it from the conductive rod by means of the corresponding disconnecting device, it can be withdrawn from the test, so that it does not affect the subsequent tests of the other DC-supported insulators. It can be seen that the main function of the disconnecting device is The corresponding DC support insulator and the conductive rod are "powered off" under the condition that the corresponding DC support insulator flashes or the flashover reaches a certain level.

The structure of the disconnecting device is as shown in FIG. 2. In the present embodiment, the breaking device includes a driving rod 21 and a threading device, and the test position 20 is provided at one end of the driving rod 21 extending into the test container and the common power supply device. Between the driving rod 21, the driving DC support insulator is driven to be connected (contacted) or separated from the common power supply device, that is, the conductive rod 18, in a straight line. To achieve the above function, one end of the driving rod 21 extends into the test container. . In order to be able to cooperate with the silk device to realize the reciprocating motion and the sealing container with the test container, the driving rod 21 is in the form of a set of thread and the other part is a cylindrical light rod. The section of the thread is a threaded section 211, the polished rod Part of the polished rod section 212. A flange is provided at a portion of the test container that cooperates with the disconnecting device, and the breaking device further includes a cover 22 corresponding to the flange opening, and the driving rod 21 is inserted through the perforation provided in the cover 22 to In the test container, in order to ensure the sealing of the test container, a flanged sealing sleeve 23 is disposed in the perforation, and a circumferential sealing ring 24 and an end sealing ring 25 are respectively disposed between the flanged sealing sleeve 23 and the sealing cover 22, and A plurality of polished rod seals 26 are also disposed between the polished rod section of the drive rod 21 and the inner bore of the flanged sealing sleeve. The significance of providing the flanged sealing sleeve 23 here is that the thickness of the sealing cover 22 is increased here, so that more sealing rings can be provided to cooperate with the polished rod section to ensure the sealing effect. The nut device comprises a bracket and a nut 27 disposed on the bracket, the bracket is composed of a nut mount 28 and a connecting rod 29 connected to the nut mount 28, the connecting rod 29 passing through the end thereof The thread provided is mounted on the outside of the corresponding cover.

The inner end of the driving rod 21 (the end that protrudes into the test container) is also provided with the tested DC supporting insulator mounting structure. Here, the mounting structure specifically adopts the connecting stud 213. In use, only the DC to be tested is required. The supporting insulator thread is assembled on the connecting stud 213 (the DC supporting insulator itself has a threaded hole at the end), and the driving rod is rotated by the hand wheel 30 mounted on the outer end of the driving rod, thereby realizing the corresponding DC supporting insulator and the tested Contact and disconnection between the conductive rods 18. During the test, each of the tested DC supporting insulators needs to be grounded separately. In the present embodiment, the driving rod 21 is made of a conductor material, and the separate grounding of the tested DC supporting insulator is realized by the corresponding driving rod. Of course, in order to achieve separate grounding, the tested DC support insulator must be insulated from the test vessel, so insulation between the drive rod 21 and the cylinder must be ensured, where the insulation between the drive rod 21 and the cylinder 12 is insulated. It is realized by the flange insulating pad 31 disposed between the corresponding cover and the test container, and the bolt insulating pad 32 between the flange connecting bolt and the test container provided between the cover and the test container, of course, not In the case of the bolt insulating pad 32, it is also possible to use an insulating bolt or a bolt whose surface is covered with an insulating layer.

In order to facilitate the disassembly and assembly of the DC support insulator of the test, an operation hole is disposed on the test container. In this embodiment, the operation hole is located on the flat cylinder portion 123 of the cylinder 12, specifically located at a side opposite to the test position, and is operated. The holes are sealed by respective covers 33.

A DC partial discharge measuring device 34 is also disposed in the second vertical cylindrical portion 122 of the cylinder 12. The DC partial discharge measuring device is used to measure partial discharge during the test, and during the test, the partial discharge at different positions is monitored and automatically recognized.

When the DC support insulator is tested using the high-voltage DC support insulator test device, a group of five tested DC support insulators can be respectively mounted on the corresponding test positions with different drive rods, and the corresponding drive is driven by the drive rod. The test DC support insulators are respectively in contact with the power supply contact portion of the conductive rod and are filled with an inert protective gas or vacuumed into the test vessel, and then the external power source is turned on through the power supply lead-in rod, and all the tested DC support insulators are applied with voltage. When a DC support insulator is flashover, the method of monitoring the leakage is used to match the drive rod to measure it, and then the flashing DC support insulator is disconnected from the conductive rod through the drive rod. The test was withdrawn, and the test was completed in the same manner until the DC support insulators of all the tested devices flashed. During the test, the DC partial discharge measuring device monitors the partial discharge amount throughout the process. Different flashover characteristics and partial discharge characteristics of different tested DC support insulators can provide a basis for the study of DC support insulators, solve the structural design problems of insulators in DC SF6 gas environment, and verify the practicability of DC epoxy material formulations. These research results can be directly applied to the development of UHV DC wall bushings, high voltage DC circuit breakers, DC pipeline busbars and other equipment.

In other embodiments of the high-voltage DC support insulator test device, the conductive rod in the above embodiment may also be replaced by a plurality of contacts. In this case, the common power supply device may also be in the form of a wire plus a contact, only For contact The disconnecting device can also adopt a switch. In this case, the switch only needs to be located between the tested DC supporting insulator and the common power supply device during the test; the driving rod can also adopt a telescopic sliding rod. In this case, if you want to ensure good contact between the DC support insulator and the common power supply device, you only need to set the preload force spring. It can be seen that the drive rod only needs to be a rod that can reciprocate along the line. In addition, the grounding of the DC support insulator of the test can also be achieved by setting a special grounding wire. In this case, the grounding wire only needs to be insulated from the test container and sealed. In the above embodiments, the test bits are all located at the same side of the conductive rod, and in other embodiments, they may also be staggered around the conductive rod.

An embodiment of a high voltage direct current support insulator test system, the high voltage direct current support insulator test system comprises a high voltage direct current support insulator test device, and the structure of the test device is the same as that of the high voltage direct current support insulator test device, and is not described herein. The test vessel of the device is connected with an air suction device, and the drive rod is connected with a leakage monitoring device for monitoring the leakage phenomenon of the DC support insulator of the test. The leakage monitoring device may specifically be a current detecting device or a voltage monitoring device.

An embodiment of a test method for a high-voltage DC support insulator, wherein one end of a set of DC support insulators is connected to a common power supply device in the same environment, and the other end is grounded separately, and the DC support is studied by monitoring leakage of each DC support insulator. In the characteristics of the insulator, if a set of DC support insulators is found to have a set flashover phenomenon during the monitoring process, it is cut off from the power supply device until all the DC support insulators are cut off from the power supply device. During the test, the partial discharge was monitored throughout the process. The leakage of the monitoring DC support insulator is realized by the leakage monitoring device, specifically the current detecting device or the voltage monitoring device; the monitoring of the partial discharge amount is realized by the DC partial discharge measuring device.

Claims

A high voltage direct current support insulator test apparatus, comprising: a sealed test vessel having a set of test positions for mounting a test DC support insulator and a contact for supplying a test voltage to the DC support insulator to be tested The utility model also has a common power supply device, and the test device further comprises a disconnecting device corresponding to the test position for disconnecting the common power supply device and the corresponding DC support insulator under the set condition.
The high voltage direct current support insulator test apparatus according to claim 1, wherein the common power supply device comprises a conductive rod, and the conductive rod is provided with contact for contacting the tested DC support insulator on each test position during the test. Power supply department.
The high voltage direct current support insulator test apparatus according to claim 2, wherein the test position is provided at a radial side of the conductive rod.
The high voltage direct current support insulator test apparatus according to any one of claims 1 to 3, characterized in that the test vessel is provided with a DC partial discharge measuring device for measuring partial discharge during the test.
The high voltage direct current support insulator test apparatus according to any one of claims 1 to 3, wherein said disconnecting means comprises a driving rod for driving said DC supporting insulator to be connected or disconnected to said common power supply means in a straight line, One end of the drive rod extends into the test vessel and is in sealing engagement with the test vessel.
The high voltage direct current support insulator test apparatus according to claim 5, wherein the test position is provided between an end of the drive rod extending into the test vessel and the common power supply device.
The high-voltage direct current support insulator test device according to claim 5, wherein the disconnecting device further comprises a nut device mounted on the test container, the drive rod has a thread segment corresponding to the nut device, and the wire device Together with the drive rod, a screw nut mechanism is formed.
The high voltage direct current support insulator test apparatus according to claim 7, wherein the test container is provided with an opening corresponding to the disconnecting device, and the breaking device further comprises a cover sealingly engaging with the corresponding opening, One end of the driving rod extends into the test container through the corresponding cover, and the driving rod and the corresponding cover engage a cylindrical optical rod segment, and the optical rod segment and the sealing cover pass through a sealing device provided therebetween Sealed fit.
The high voltage direct current support insulator test apparatus according to claim 8, wherein the wire mother device comprises a bracket and a nut disposed on the bracket, and the bracket is mounted outside the corresponding end cover.
The high-voltage direct current supporting insulator testing device according to any one of claims 1 to 3, characterized in that the test container is further provided with an insulator grounding device for grounding each of the tested DC supporting insulators in use, and the insulator grounding device Sealed with the test container.
The high-voltage direct current support insulator test device according to any one of claims 1 to 3, wherein the test container is provided with an operation corresponding to the test position for detaching the tested DC support insulator to the test position. Hole, operation hole through The corresponding lid is sealed.
The high-voltage direct current supporting insulator testing device according to any one of claims 1 to 3, characterized in that the test container is provided with a charging and discharging port.
A high voltage direct current support insulator test system, comprising the high voltage direct current support insulator test device according to any one of claims 1 to 12, wherein the test container of the test device is connected with an air suction device, and the system further comprises a monitoring device A leakage monitoring device for testing the leakage phenomenon of a DC supporting insulator.
A test method for a high-voltage direct current support insulator, which is characterized in that, in the same environment, one end of a group of DC support insulators is connected to a common power supply device, and the other end is grounded separately, and the direct current is monitored by monitoring the leakage of each DC support insulator. In the monitoring process, if a set of DC support insulators is found to have a set degree of flashover phenomenon during the monitoring process, it is cut off from the power supply device until all the tested DC support insulators are cut off from the power supply device.
The high voltage direct current support insulator test method according to claim 14, wherein the partial discharge amount is monitored throughout the test.