Multifunctional bushing protective cover structure of 500kV high-voltage bushing

Abstract

The utility model relates to a multifunctional bushing protective cover structure of a 500kV high-voltage bushing, and belongs to the technical field of transformer manufacturing. According to the technical scheme, the lower portion of a 500kV casing pipe (8) is arranged in an in-oil casing pipe protective cover (9), the upper portion of the 500kV casing pipe (8) is arranged in an air side casing pipe protective cover (4), the top of the 500kV casing pipe (8) is provided with a casing pipe voltage-sharing ball (5), and the air side casing pipe protective cover (4) is connected with the in-oil casing pipe protective cover (9) through an ascending flanged base (7); the air side sleeve protective cover (4) is connected with the protective cover inflating device (1) and the visible gas pressure gauge (3) through pipelines; and the air side sleeve protective cover (4) is provided with a test measurement reserved interface (6). The beneficial effects of the utility model are that: have simple structure, convenient operation characteristics such as simple structure, satisfy single-phase 500kV transformer transportation, on-site installation and test requirements, ensure that single-phase 500kV transformer can be safely used as the spare phase.

Description

TECHNICAL FIELD

[0001] The utility model relates to a multifunctional bushing protective cover structure of 500kV high voltage bushing belongs to transformer manufacturing technical field. BACKGROUND

[0002] In single-phase 500kV transformer, the installation and use of general high voltage bushing can be detachable lead structure, when single-phase 500kV transformer is used as standby phase, to ensure the performance of transformer high voltage bushing, the transformer can need long time in the field storage, and the on-site protection, transportation, test and maintenance requirements of high voltage bushing need to be considered. The high voltage bushing of single-phase 500kV transformer is generally provided with a protective cover, but if the single-phase 500kV transformer used as standby phase needs to be transported to the site for standby storage, dry air or nitrogen needs to be filled in the high voltage bushing protective cover before transportation, and the purity, pressure and water content of the gas in the protective cover are detected to determine whether the gas in the bushing protective cover meets the transportation requirements. When the transformer needs to be stored for a long time, the pressure in the bushing riser needs to be monitored at intervals, and when the pressure is found to be too low, dry nitrogen needs to be injected again to completely isolate the high voltage bushing upper terminal from air, so as to avoid corrosion of the high voltage bushing upper terminal, and the air side high voltage bushing protective cover has nitrogen filling maintenance function. Before the transformer body and high voltage bushing protective cover are put into use, SF6 gas needs to be filled into the air side high voltage bushing protective cover, so that the pressure of SF6 gas in the bushing protective cover reaches 0.5MPa, and the high voltage winding partial discharge test is carried out to completely simulate the working environment of high voltage bushing when the transformer is actually put into operation, so as to be safely put into use. However, the high voltage bushing protective cover structure of the prior art does not consider the above requirements, it is very difficult to detect the purity, pressure and water content of the gas before transportation, the high voltage winding partial discharge test cannot be carried out on site, and the transportation and normal use of 500kV high voltage bushing are affected. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a multifunctional bushing protective cover structure of 500kV high voltage bushing, which has the characteristics of simple structure and convenient operation, meets the transportation, on-site installation and test requirements of single-phase 500kV transformer, ensures the safe use of single-phase 500kV transformer as standby phase, and solves the above technical problems existing in the prior art.

[0004] The technical scheme of the utility model is:

[0005] A multifunctional bushing protective cover structure for a 500kV high-voltage bushing includes a protective cover inflation device, a visible gas pressure gauge, an air-side bushing protective cover, a bushing equalization ball, a riser, a 500kV bushing, and an oil-immersed bushing protective cover. The 500kV bushing is installed vertically, with the lower part of the 500kV bushing housed within the oil-immersed bushing protective cover and the upper part of the 500kV bushing housed within the air-side bushing protective cover. A bushing equalization ball is located at the top of the 500kV bushing. The air-side bushing protective cover and the oil-immersed bushing protective cover are connected via a riser. The air-side bushing protective cover is connected to the protective cover inflation device and the visible gas pressure gauge via a pipeline. The air-side bushing protective cover has a reserved interface for testing and measurement.

[0006] The oil-side casing protective cover is connected to the lower part of the riser via a casing mounting lower flange, and the air-side casing protective cover is connected to the upper part of the riser via a casing mounting upper flange.

[0007] Sealing gaskets are placed between the lower part of the riser seat and the lower flange of the bushing installation, between the lower flange of the bushing installation and the bushing protective cover in the oil, between the air-side bushing protective cover and the upper flange of the bushing installation, and between the upper flange of the bushing installation and the upper part of the riser seat. This achieves complete sealing of the air side of the 500kV bushing and fulfills the prerequisites for protection, transportation, testing, and nitrogen purging maintenance.

[0008] The reserved interface for the test measurement is closed by a reserved valve.

[0009] A gas isolation valve is provided between the air-side sleeve protective cover and the protective cover inflation device.

[0010] When a single-phase 500kV transformer (including the transformer body, experimental setup, and the multifunctional bushing protective cover of this invention) needs to be transported, dry air or nitrogen is injected into the air-side bushing protective cover using the protective cover inflation device. Gas samples are collected through the reserved interface for testing and measurement to detect the purity, pressure, and moisture content of the gas inside the air-side bushing protective cover. When the single-phase 500kV transformer is used as a spare phase or needs to be stored for a long time, dry nitrogen can be injected again if the pressure is found to be too low. SF6 gas is also injected into the air-side bushing protective cover using the protective cover inflation device, and a high-voltage winding partial discharge test is conducted through the reserved interface for testing and measurement.

[0011] The beneficial effects of this utility model are: it has the characteristics of simple structure and convenient operation, meets the requirements of transportation, on-site installation and testing of single-phase 500kV transformer, and ensures the safe use of single-phase 500kV transformer as a backup phase. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] In the figure: protective cover inflation device 1, gas isolation valve 2, visual gas pressure gauge 3, air side bushing protective cover 4, bushing equalizing ball 5, test measurement reserved interface 6, elevated seat 7, 500kV bushing 8, oil bushing protective cover 9, bushing installation lower flange plate 10, reserved valve 11, bushing installation upper flange plate 12. DETAILED DESCRIPTION

[0014] The utility model is further described by examples in connection with the drawings.

[0015] A multifunctional bushing protective cover structure of 500kV high-voltage bushing, comprising a protective cover inflation device 1, a visual gas pressure gauge 3, an air side bushing protective cover 4, a bushing equalizing ball 5, an elevated seat 7, a 500kV bushing 8, and an oil bushing protective cover 9, wherein the 500kV bushing 8 is vertically installed, the lower part of the 500kV bushing 8 is arranged in the oil bushing protective cover 9, the upper part of the 500kV bushing 8 is arranged in the air side bushing protective cover 4, the top of the 500kV bushing 8 is provided with the bushing equalizing ball 5, and the air side bushing protective cover 4 and the oil bushing protective cover 9 are connected through the elevated seat 7; the air side bushing protective cover 4 is connected with the protective cover inflation device 1 and the visual gas pressure gauge 3 through pipelines; and the air side bushing protective cover 4 is provided with a test measurement reserved interface 6.

[0016] The oil bushing protective cover 9 is connected with the lower part of the elevated seat 7 through a bushing installation lower flange plate 10, and the air side bushing protective cover 4 is connected with the upper part of the elevated seat 7 through a bushing installation upper flange plate 12.

[0017] The connection between the lower part of the elevated seat 7 and the bushing installation lower flange plate 10, the connection between the bushing installation lower flange plate 10 and the oil bushing protective cover 9, the connection between the air side bushing protective cover 4 and the bushing installation upper flange plate 12, and the connection between the bushing installation upper flange plate 12 and the upper part of the elevated seat 7 are all provided with sealing washers.

[0018] The test measurement reserved interface 6 is closed through a reserved valve 11.

[0019] The air side bushing protective cover 4 is provided with a gas isolation valve 2 between the air side bushing protective cover 4 and the protective cover inflation device 1.

[0020] The 500kV bushing 8 is fixed on the oil bushing shield 9 by the metal fastener through the bushing installation lower flange plate 10, the upper flange installation hole of the oil bushing shield 9 is fixed with the lower flange installation hole of the elevated seat 7 through the metal fastener, the flange installation hole of the lower bushing installation upper flange plate 12 of the air side bushing shield 4 is fixed with the upper flange installation hole of the elevated seat 7 through the metal fastener, the sealing gasket is arranged between the bushing installation lower flange plate 10 and the bushing installation upper flange plate 12 connected with the oil bushing shield 9 and the bushing air side shield 4 respectively of the elevated seat 7, the complete sealing of the 500kV bushing 8 air side is realized, and the prerequisite conditions of protection, transportation, test and nitrogen filling maintenance are provided.

[0021] When the single-phase 500kV transformer (including the transformer body, the experimental device and the multifunctional bushing shield of the utility model) needs to be transported, the gas isolation valve 2 is opened first, dry air or nitrogen is filled into the air side bushing shield 4 through the shield inflation device 1, then the visual gas pressure gauge 3 is observed, when the gas pressure in the air side bushing shield 4 meets the transportation requirement, the inflation is stopped and the gas isolation valve 2 is closed, then the reserved valve 11 is opened, the gas sample is collected through the test measurement reserved interface 6, and the purity, pressure and water content of the gas in the air side bushing shield 4 are detected to determine whether the gas in the bushing shield and the experimental device meets the transportation requirement.

[0022] When the single-phase 500kV transformer is used as a standby phase or needs to be stored for a long time, high-purity nitrogen can be filled into the air side bushing shield 4 through the shield inflation device 1, the pressure in the air side bushing shield 4 can be monitored once every interval, and when the pressure is found to be too low, dry nitrogen can be injected again, so that the upper terminal of the 500kV bushing 8 is completely isolated from the air, the upper terminal of the 500kV bushing 8 is prevented from being corroded, and the multifunctional bushing shield of the utility model has the nitrogen filling maintenance function.

[0023] When the transformer body, the experimental device and the multifunctional bushing shield of the utility model are installed on site, SF6 gas is filled into the air side bushing shield 4 through the shield inflation device 1, so that the pressure of the SF6 gas in the air side bushing shield 4 reaches 0.5MPa, the working environment of the high-voltage bushing when the transformer is actually put into operation is completely simulated, at this time, the reserved valve 11 can be opened, and the high-voltage winding partial discharge test can be carried out through the test measurement reserved interface 6.

Claims

1. A multifunctional bushing shield structure of a 500 kV high voltage bushing, characterized in that: The utility model relates to a kind of 500kV bushing protection cover, including protection cover inflator (1), visual gas pressure gauge (3), air side sleeve protection cover (4), sleeve equalizing ball (5), elevated seat (7), 500kV sleeve (8) and oil in sleeve protection cover (9), 500kV sleeve (8) is vertically installed, 500kV sleeve (8) lower part is arranged in oil in sleeve protection cover (9), 500kV sleeve (8) upper part is arranged in air side sleeve protection cover (4), the top of 500kV sleeve (8) is equipped with sleeve equalizing ball (5), air side sleeve protection cover (4) and oil in sleeve protection cover (9) are connected by elevated seat (7);The air side sleeve protection cover (4) is connected protection cover inflator (1) and visual gas pressure gauge (3) by pipeline;The air side sleeve protection cover (4) is equipped with test measurement reserved interface (6) on it.

2. The multifunctional shield structure of a 500 kV high voltage bushing according to claim 1, characterized in that: The oil in sleeve protection cover (9) is connected with the lower part of elevated seat (7) by sleeve installation lower flange (10), and the air side sleeve protection cover (4) is connected with the upper part of elevated seat (7) by sleeve installation upper flange (12).

3. The multifunctional shield structure of a 500 kV high voltage bushing according to claim 1 or 2, characterized in that: The test measurement reserved interface (6) is closed by reserved valve (11).

4. The multifunctional shield structure of a 500 kV high voltage bushing according to claim 1 or 2, characterized in that: The air side sleeve protection cover (4) is equipped with gas isolation valve (2) between protection cover inflator (1).

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