A GIS device-based maintenance method without power interruption

Abstract

The present application relates to the technical field of high-voltage electrical appliance overhauling, and provides a non-stop overhauling method based on GIS equipment, comprising: stopping power supply of a first bus, carrying out voltage reduction treatment on GIS bus-tie interval equipment to be overhauled, and keeping a second bus running; disconnecting the first knife gap gas chamber and the first CT gas chamber and the first bus gas chamber respectively; inflating the first bus gas chamber to rated pressure, and restoring the first bus to run; stopping power supply of the second bus, and carrying out GIS equipment overhauling; the whole process keeps at least one bus running all the time, and after entering overhauling, the first bus can keep working, so that reliable power supply of the power station is ensured during overhauling of the GIS equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage electrical appliance maintenance, and particularly relates to a non-power-off maintenance method based on GIS equipment. BACKGROUND

[0002] GIS equipment is widely used in substations due to its compact structure, small footprint, high reliability, and small maintenance amount.

[0003] Currently, the GIS equipment used in factories and stations is old in technology, and the GIS insulation basin is not comprehensively subjected to water pressure test before leaving the factory, so it is uncertain whether it can withstand the pressure difference between the rated pressure and the vacuum. When the GIS bus tie bay equipment is replaced or maintained, the circuit breaker on both sides needs to be depressurized, which causes both of the two buses connected with the GIS equipment to be powered off.

[0004] The above-mentioned scheme of powering off both buses during maintenance is designed when the early GIS equipment leaves the factory. However, with the expansion of substations, the number of GIS equipment is greatly increased, and there are multiple bay devices on the bus. If both buses are powered off due to the maintenance of one GIS equipment, all the bays on the bus will be powered off, and even the whole station will be powered off, which seriously affects the reliable supply of electricity in the current environment of tight power supply. SUMMARY

[0005] The present application provides a non-power-off maintenance method based on GIS equipment, which is used to solve the technical problem of bus power-off during maintenance of GIS circuit breaker.

[0006] The present application provides a non-power-off maintenance method based on GIS equipment, which comprises:

[0007] Powering off the first bus, depressurizing the GIS bus tie bay equipment to be maintained, reducing the air pressure of the first knife gap air chamber to a value that can be safely disconnected, and keeping the second bus running;

[0008] Disconnecting the first knife gap air chamber from the first CT air chamber and the first bus air chamber, respectively;

[0009] Inflating the first bus air chamber to the rated pressure to restore the first bus to run;

[0010] Powering off the second bus to maintain the GIS bus tie bay equipment.

[0011] Optionally, the depressurizing of the GIS bus tie bay equipment is specifically:

[0012] The air pressure of the first knife gap air chamber, the first CT air chamber and the first bus air chamber is reduced to the first air pressure, the air pressure of the circuit breaker air chamber is reduced to the second air pressure, the second CT air chamber is reduced to the third air pressure, and the second bus air chamber maintains the rated pressure.

[0013] The values of the first air pressure, the second air pressure and the third air pressure are sequentially increased, and the first air pressure is not less than the atmospheric pressure, and the third air pressure is not greater than the rated air pressure.

[0014] Optionally, the connection between the first knife switch air chamber and the first CT air chamber and the first busbar air chamber is disconnected, specifically as follows:

[0015] The first knife switch air chamber is hoisted and fixed;

[0016] The tank body connection between the first knife switch air chamber and the first CT air chamber and the tank body connection between the first knife switch air chamber and the first busbar air chamber are disconnected;

[0017] The margin inside the first knife switch air chamber is measured;

[0018] According to the margin, the tank body of the first knife switch air chamber is moved, and the connection of the conductor contact of the first knife switch air chamber is disconnected.

[0019] Optionally, the margin inside the first knife switch air chamber is measured, specifically as follows:

[0020] The margin in the vertical direction and the horizontal direction inside the first knife switch air chamber is measured;

[0021] According to the allowed expansion amount of the contact seat finger and the spring, the margin in the vertical direction is determined;

[0022] According to the spacing between the inner wall of the knife switch tank body and the internal conductor, the margin in the horizontal direction is determined.

[0023] Optionally, according to the margin, the tank body of the first knife switch air chamber is moved, specifically as follows:

[0024] According to the margins in the vertical direction and the horizontal direction, the rotation margin of the first knife switch air chamber is calculated;

[0025] According to the rotation margin, the movement trajectory of the first knife switch air chamber is determined;

[0026] According to the movement trajectory, the first knife switch air chamber is rotated by the hoisting equipment, so that the distance between the disconnection positions of the first knife switch air chamber and the first CT air chamber and the first knife switch air chamber and the first busbar air chamber is increased, and an operation opening is formed.

[0027] Optionally, before the tank body connection between the first knife switch air chamber and the first CT air chamber is disconnected, the following steps are included:

[0028] According to the stress condition of the first CT air chamber, the support point position is confirmed;

[0029] According to the support point, a support device is arranged below the first CT air chamber.

[0030] Optionally, the first busbar gas chamber is inflated to the rated pressure to restore the operation of the first busbar, in particular as follows:

[0031] A cover is installed at the disconnecting opening of the first busbar gas chamber;

[0032] SF6 gas is filled into the first busbar gas chamber until the pressure is restored to the rated pressure;

[0033] A density relay of the first busbar gas chamber is set to monitor and alarm signals to restore the operation of the first busbar.

[0034] Optionally, the second busbar is powered off for GIS equipment maintenance, in particular as follows:

[0035] A cover is installed at the disconnecting opening of the first CT gas chamber;

[0036] SF6 gas is filled into the first CT gas chamber until the pressure rises to the second gas pressure;

[0037] The second busbar is powered off to reduce the pressure of the circuit breaker gas chamber to a value that can be safely maintained, and the circuit breaker is maintained.

[0038] Optionally, the pressure of the circuit breaker gas chamber is reduced to a value that can be safely maintained, in particular as follows:

[0039] The pressure of the circuit breaker gas chamber is reduced to the first gas pressure, the second CT gas chamber is reduced to the second gas pressure, and the second busbar gas chamber is reduced to the third gas pressure.

[0040] Optionally, the pressure reduction process of the GIS busbar interval equipment further includes:

[0041] The gas chambers whose pressure needs to be reduced are simultaneously started at the same rate to reduce the pressure, so that the pressure of each gas chamber is reduced to the value set by the pressure reduction process.

[0042] As can be seen from the above technical solutions, the present application has the following advantages: the first busbar is powered off, and the GIS busbar interval equipment to be maintained is subjected to a pressure reduction process to maintain the operation of the second busbar; the connection between the first knife switch gas chamber and the first CT gas chamber and the first busbar gas chamber is disconnected respectively; the first busbar gas chamber is inflated to the rated pressure to restore the operation of the first busbar; the second busbar is powered off for GIS equipment maintenance; in the state that the first busbar is powered off and the second busbar is operated, the first knife switch gas chamber is disconnected to create the condition for the first busbar to resume operation during the maintenance of the GIS equipment, and then the operation of the first busbar is restored, and the second busbar is powered off for GIS equipment maintenance, so that at least one busbar is always in operation during the entire process, and the first busbar can be maintained during the maintenance of the GIS equipment, thereby ensuring the reliable power supply of the power plant during the maintenance of the GIS equipment. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0044] Figure 1 It is a GIS device-based uninterrupted maintenance method flow chart;

[0045] Figure 2 It is a GIS device-based uninterrupted maintenance method flow chart;

[0046] Figure 3 It is a GIS device-based uninterrupted maintenance method flow chart;

[0047] Figure 4 It is a GIS device-based uninterrupted maintenance method flow chart;

[0048] Figure 5 It is a GIS device-based uninterrupted maintenance method flow chart;

[0049] Figure 6 It is a GIS device-based uninterrupted maintenance method flow chart;

[0050] Figure 7 It is a GIS device-based uninterrupted maintenance method flow chart. DETAILED DESCRIPTION

[0051] The embodiment of the present application provides a GIS device-based uninterrupted maintenance method, which is used for solving the technical problem of busbar same stop during GIS device circuit breaker maintenance.

[0052] In order to make the purposes, features and advantages of the present application more obvious and easy to understand, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the following described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0053] Please refer to Figure 2 , Figure 2The structure diagram of GIS bus tie interval equipment is provided in the embodiment of the present application. In the diagram, the GIS equipment is installed on two busbars of a power plant as a first busbar chamber 100 and a second busbar chamber 200 respectively. The first busbar chamber 100 is adjacent to a first switch chamber 300, and the first switch chamber 300 is connected with a first CT chamber 400. A circuit breaker chamber 500 is adjacent to the first CT chamber 400 and a second CT chamber 600 respectively. The second CT chamber 600 is connected with the second switch chamber and the second busbar chamber 200. Each chamber is internally provided with a conductor connected to a busbar. Each chamber is filled with SF6 gas and kept at a rated pressure, so that the conductor in the chamber can be kept in safe high-voltage operation in the atmosphere of inert gas.

[0054] Please refer to Figure 1 , Figure 1 The flow chart of a non-power-off maintenance method based on GIS equipment is provided in the embodiment of the present application. The non-power-off maintenance method based on GIS equipment provided in the present application comprises the following steps.

[0055] S100, power off the first busbar, and depressurize the GIS bus tie interval equipment to be maintained, so that the air pressure of the first switch chamber is reduced to a value at which the first switch chamber can be safely disconnected, and the second busbar is kept in operation.

[0056] It should be noted that the new northeast ZF6-252 type GIS bus tie equipment is taken as an example in the embodiment. The maintenance scheme of the equipment when it is delivered from the factory is to power off both busbars and then perform maintenance. The equipment has been delivered from the factory for a long time, and the manufacturer has not considered the expansion and development speed of the power plant, so that a large number of equipment on the busbar are in operation, which leads to the fact that the busbar cannot be powered off at will, and it is difficult to implement the original maintenance scheme of the GIS equipment. Therefore, in the embodiment, the maintenance of the GIS equipment is completed under the condition that the two busbars are not powered off at the same time.

[0057] The air pressure of the SF6 in the chamber needs to be ensured when the busbar is in operation, so the busbar needs to be powered off first and then the depressurization of the equipment chamber is performed. When the first busbar is powered off and the GIS bus tie interval equipment is depressurized, not only the condition for disconnecting the first switch chamber and the adjacent chamber in the subsequent step is created, but also the SF6 gas in each chamber is recovered, so that the air pressure of the first switch chamber is reduced, and the first switch chamber can be safely and quickly disconnected. In addition, the second busbar needs to be kept in operation, i.e. the second busbar chamber needs to be kept at a rated pressure. The insulation basin at the connection between each chamber of the GIS equipment is not completely subjected to a water pressure test when it is delivered from the factory, and the staff cannot confirm the accurate value of the pressure difference it can withstand. Therefore, the pressure difference between the chambers cannot be too large. Therefore, under the premise that the second busbar chamber is kept at a rated pressure, the SF6 gas pressure of each adjacent chamber needs to be controlled, so that the air pressure of the first switch chamber is reduced to a suitable degree for disconnection.

[0058] S200, disconnect the first knife gap gas chamber from the first CT gas chamber and the first busbar gas chamber, respectively;

[0059] It should be noted that the structure design of the GIS device when it leaves the factory does not consider the implementation of the test method of the embodiment, so the disconnection position of the first knife gap gas chamber can be selected at the separation of the gas chamber according to the distribution of the gas chamber, or the gas chamber separation condition can be ignored and the device connection can be directly disconnected, and then the gas chamber can be sealed by installing a cover at the disconnection opening.

[0060] S300, inflate the first busbar gas chamber to the rated pressure, and restore the first busbar operation;

[0061] It should be noted that after the first knife gap gas chamber is disconnected from the first busbar gas chamber, the first busbar gas chamber is separated from the GIS device, and only needs to be inflated with SF6 gas to restore the operation to the rated pressure, so that the operation of the first busbar can be restored, so that the second busbar is de-energized during the subsequent step of overhauling the GIS device, but does not affect the operation of the first busbar, and the different buses are stopped.

[0062] Further, the first busbar connected in the first busbar gas chamber is a 2M busbar, and the second busbar connected in the second busbar gas chamber is a 1M busbar.

[0063] S400, de-energize the second busbar and perform GIS device maintenance.

[0064] It should be noted that after the operation of the first busbar is restored, the second busbar can be de-energized for maintenance of the GIS device. Referring to Figure 1 , in the GIS bus tie interval device, the second CT gas chamber 600 on the second busbar gas chamber 200 is directly connected to the second knife gap gas chamber, so the gas pressures of the two gas chambers are the same, and the gas pressure of the second CT gas chamber represents the common gas pressure of the two gas chambers, which will not be described in detail. Therefore, the de-energization of the second busbar is a necessary condition for the replacement of the circuit breaker of all GIS devices.

[0065] In this embodiment, by de-energizing the first busbar and performing voltage reduction on the GIS bus tie interval device to be maintained, the second busbar is kept running; the first knife gap gas chamber is disconnected from the first CT gas chamber and the first busbar gas chamber, respectively; the first busbar gas chamber is inflated to the rated pressure, and the first busbar operation is restored; the second busbar is de-energized, and the GIS device is maintained; when the first busbar is de-energized and the second busbar is kept running, the first knife gap gas chamber is disconnected, the conditions for restoring the operation of the first busbar are created, the operation of the first busbar is restored, and then the second busbar is de-energized, and the GIS device is maintained. The entire process always keeps at least one busbar in operation, and after entering the maintenance, the first busbar can keep working, ensuring reliable power supply of the power station during maintenance of the GIS device.

[0066] The above is a detailed description of a first embodiment of the GIS device-based maintenance method provided in the present application, and the following is a detailed description of a second embodiment of the GIS device-based maintenance method provided in the present application.

[0067] With reference to Figure 3 , Figure 3 The GIS device-based maintenance method provided in the embodiment of the present application is a depressurization flowchart; in step S100 of the foregoing embodiment, the first bus is powered off, the GIS bus tie compartment device to be maintained is subjected to depressurization processing, the air pressure of the first knife gap air chamber is reduced to a value at which the first knife gap air chamber can be safely disconnected, and the second bus is kept running, specifically:

[0068] S110, the air pressure of the first knife gap air chamber, the first CT air chamber and the first bus air chamber is reduced to a first air pressure, the air pressure of the circuit breaker air chamber is reduced to a second air pressure, and the second CT air chamber is reduced to a third air pressure;

[0069] It should be noted that the first air pressure, the second air pressure and the third air pressure are increased in turn, and the first air pressure is not less than the atmospheric pressure, and the third air pressure is not greater than the rated pressure. At this time, the first knife gap air chamber, the first CT air chamber and the first bus air chamber are at the first air pressure at which they can be safely disconnected, and the air pressure gradually increases from the first CT air chamber through the circuit breaker air chamber to the second CT air chamber. In this way, while ensuring that the first knife gap air chamber can be safely disconnected in the subsequent steps, the pressure difference between adjacent air chambers is not too large, thereby avoiding the risk that the air pressure may exceed the tolerance of the insulating pot and the stress damage that may occur.

[0070] Further, the rated pressure refers to the minimum threshold of the SF6 gas pressure range at which the GIS device can safely operate. The minimum threshold as the rated pressure can make the pressure difference between the air chambers as small as possible after the depressurization processing, thereby further ensuring the safety of the air chambers and reducing the workload of recovering the SF6 gas.

[0071] In the embodiment, the first air pressure is set to the atmospheric pressure, the second air pressure is set to a slight positive pressure, and the third air pressure is set to a half-depressurized pressure. The slight positive pressure is a gas pressure slightly higher than the atmospheric pressure, about 0.02 Mpa; the half-depressurized pressure is half of the rated pressure, which is set according to the actual pressure in each GIS device. In the actual maintenance process, the insulating pot and the tank body can also be subjected to operation risk assessment, and the pressure setting for depressurization processing can be made according to the actual situation.

[0072] Further, in order to avoid the problem of excessive pressure difference between the chambers during the depressurization process, for example, the first CT chamber is depressurized to the first pressure, while the breaker chamber is still at the rated pressure, resulting in an excessive pressure difference between the first CT chamber and the breaker chamber, in the embodiment, the pressure is simultaneously reduced at the same rate, and each chamber is depressurized to the set value, and the chamber that needs to be depressurized is no longer depressurized after reaching the set value, while the chamber that has not reached the set pressure continues to be depressurized, ensuring the safety of the equipment during the depressurization process.

[0073] Further, the SF6 pressure value of the adjacent charged operating chamber of the depressurized chamber is regularly observed. A patrol record plan is formulated, and the patrol frequency should be increased during the SF6 gas recovery stage, so as to timely find the insulation basin leakage hidden danger.

[0074] S120, the second bus chamber maintains the rated pressure.

[0075] It should be noted that the second bus needs to be ensured during the depressurization process, so the second bus chamber needs to maintain the rated pressure, and the pressure of the adjacent chambers between the second bus chamber and the first knife gap chamber is sequentially increased from the first CT chamber to the second CT chamber, which can maintain the rated pressure of the second bus chamber under the premise of ensuring the safety of the insulation basin.

[0076] Referring to Figure 4 , Figure 4 A GIS device-based non-power maintenance method is provided in the embodiment of the application. A breaker disconnection flowchart is provided in the step S200 of the foregoing embodiment, and the connection between the first knife gap chamber and the first CT chamber and the first bus chamber is disconnected, specifically as follows.

[0077] S210, hoisting and fixing the first knife gap chamber;

[0078] It should be noted that the subsequent step needs to disconnect the first knife gap chamber from the GIS device, and in order to prevent the first knife gap chamber from colliding with other chambers, the first knife gap chamber needs to be hoisted and fixed, so that the tank body is stable during the subsequent disconnection operation and does not collide, and the rotation during the subsequent removal of the conductor contact is facilitated.

[0079] S220, disconnecting the tank body connection between the first knife gap chamber and the first CT chamber, and the tank body connection between the first knife gap chamber and the first bus chamber, respectively;

[0080] Referring to Figure 5 , Figure 5The GIS bus tie bay device chopping structure provided by the embodiment of the application needs to disconnect the connection of the knife switch gas chamber tank 320 first, and then disconnect the connection of the conductor contact 310, so as to completely disconnect the first knife switch gas chamber. It should be noted that the first knife switch gas chamber is not provided with a hand hole to pre-remove the internal conductor, and therefore the connection of the tank needs to be disconnected first, and then the disconnection of the conductor contact is performed at the tank disconnection opening.

[0081] Further, the first knife switch gas chamber is in a 7-shaped structure, and the first CT gas chamber connected therewith is in a suspended state after being disconnected. In order to avoid the local force damage of the butt joint surface caused by the loss of support of the tank, especially the stress aging problem of the equipment with a long service life, a supporting device needs to be arranged for the first CT gas chamber before the connection of the tank is disconnected. The supporting point position is determined according to the actual stress condition of the first CT gas chamber after being disconnected, and then the supporting device is arranged below the first CT gas chamber according to the supporting point.

[0082] S230, measuring the margin inside the first knife switch gas chamber;

[0083] It should be noted that the tank connection of the first knife switch gas chamber is disconnected in the foregoing step, but the internal conductor still needs to be disconnected. The space inside the tank is limited, and in order to protect the fragile conductor and avoid the bumping when the tank moves, the margin inside the first knife switch gas chamber needs to be measured first, and the movement and amplitude range of the tank in the subsequent step are calculated.

[0084] Further, the margin measured is the margin of the first knife switch gas chamber in the vertical direction and the horizontal direction; the margin in the vertical direction is determined according to the allowed expansion amount of the contact seat finger and the spring; and the margin in the horizontal direction is determined according to the spacing between the inner wall of the knife switch tank and the internal conductor.

[0085] S240, moving the tank of the first knife switch gas chamber according to the margin, and disconnecting the connection of the conductor contact of the first knife switch gas chamber.

[0086] It should be noted that because the first knife switch gas chamber has a special 7-shaped structure, the direction and angle of hoisting and moving are greatly limited, and therefore high-precision hoisting needs to be performed to move the tank to form an opening. In the embodiment, the tank is rotated to move the first knife switch gas chamber, and the subsequent disconnection of the conductor contact is performed; the rotation margin of the first knife switch gas chamber is calculated according to the margin in the vertical direction and the margin in the horizontal direction, that is, the amplitude of the rotation of the tank, and then the trajectory of the movement of the first knife switch gas chamber is determined. The trajectory is set to form an operation opening with a spacing sufficient for the disconnection operation of the staff at the disconnection opening, and also to ensure that the first knife switch gas chamber does not collide with the inside and outside when moving along the trajectory.

[0087] According to the moving track, the first knife switch gas chamber is rotated by hoisting equipment, the first knife switch gas chamber and the first CT gas chamber are spaced apart, and the first knife switch gas chamber and the first busbar gas chamber are spaced apart, so that an operation opening is formed; in the embodiment, the fixing screws on the flange surface of the first knife switch gas chamber tank body are removed first, then the first knife switch gas chamber is rotated clockwise by the hoisting equipment, the rotation range should be within the rotation margin, the disconnection part of the first knife switch gas chamber and the first CT gas chamber forms a horizontal upward opening, the disconnection part of the first knife switch gas chamber and the first busbar gas chamber forms a horizontal left operation opening, and a rubber pad is placed between the tank body and the insulating basin to protect the insulating basin; the clockwise rotation direction here refers to the direction from the second busbar gas chamber to the first busbar gas chamber with the 7-shaped corner of the first knife switch gas chamber as the axis. After the first knife switch gas chamber is rotated in the clockwise direction, the operation opening is formed, and the opening direction can facilitate the disassembly and assembly of the conductor by the staff. In actual maintenance, other moving tracks that are more convenient for the staff to operate can be selected according to actual operation conditions.

[0088] Further, when the first knife switch gas chamber is reinstalled into the GIS equipment, the above-mentioned reverse step sequence can be used.

[0089] In the embodiment, the first busbar is powered off, the GIS busbar interval equipment to be maintained is subjected to voltage reduction treatment, the second busbar is kept running, the connection between the first knife switch gas chamber and the first CT gas chamber and the first busbar gas chamber is disconnected, and the tank body and the conductor are disassembled by high-precision hoisting, so that the structural integrity and safety of the GIS equipment are protected to the greatest extent, and the reliable power supply of the power plant during maintenance of the GIS equipment is ensured.

[0090] The above is a detailed description of a second embodiment of the non-power-off maintenance method based on the GIS equipment provided in the application, and the following is a detailed description of a third embodiment of the non-power-off maintenance method based on the GIS equipment provided in the application.

[0091] Reference Figure 6 , Figure 6 The flow chart of the non-power-off maintenance method based on the GIS equipment provided in the embodiment of the application; in step S300 of the foregoing embodiment, the first busbar gas chamber is inflated to the rated pressure, and the first busbar is restored to operation, specifically:

[0092] S310, a cover is added at the disconnection opening of the first busbar gas chamber;

[0093] It should be noted that the cover added at the disconnection opening of the first busbar gas chamber is an inflation cover plate, which can seal the first busbar gas chamber and inflate SF6 gas in the gas chamber.

[0094] S320, fill the first busbar gas chamber with SF6 gas until the pressure returns to the rated pressure;

[0095] S330, set up density relay monitoring and alarm signals for the first busbar gas chamber, and restore the operation of the first busbar.

[0096] It should be noted that after sealing the first busbar gas chamber, the SF6 density relay monitoring of the gas chamber needs to be improved to ensure that the gas pressure of the first busbar gas chamber can be stabilized after the GIS equipment is separated. The alarm signal should also be improved to provide timely reminders when the gas chamber loses pressure or internal leakage occurs. The operation of the first busbar can only be restored after the protection measures of the first busbar gas chamber are set up.

[0097] In step S400 of the aforementioned embodiment, the step of de-energizing the second busbar and performing GIS equipment maintenance specifically involves:

[0098] S410, a cover is installed at the break point of the first CT air chamber;

[0099] It should be noted that an inflation cover is installed at the disconnection point of the first CT air chamber, which can seal the first CT air chamber while filling it with SF6 gas.

[0100] S420, fill the first CT chamber with SF6 gas until the pressure rises to the second pressure;

[0101] It should be noted that in this embodiment, after sealing the first CT air chamber, the air chamber is inflated to a slightly positive pressure to facilitate the maintenance of the GIS equipment in subsequent steps.

[0102] S430: De-energize the second busbar to reduce the gas pressure in the circuit breaker chamber to a level suitable for safe maintenance, and then perform circuit breaker maintenance.

[0103] It should be noted that when the second busbar is de-energized, the first busbar remains operational, preventing a simultaneous busbar outage and ensuring the plant's power supply. During circuit breaker maintenance, the gas pressure in the circuit breaker chambers must be reduced to a safe level for maintenance: the circuit breaker chamber pressure must be reduced to the first pressure, the second CT chamber to the second pressure, and the second busbar chamber to the third pressure.

[0104] In this embodiment, when replacing or overhauling the circuit breaker, the pressure in the circuit breaker chamber needs to be reduced to atmospheric pressure. The second CT chamber, which is the chamber containing the insulating basin involved in the docking operation, also needs to be reduced to a slightly positive pressure. The pressure in the second busbar chamber needs to be reduced to half pressure. Only in this way can the circuit breaker equipment be overhauled while ensuring the structural integrity and safety of the GIS equipment, and the amount of SF6 gas recovered be minimized, thereby reducing the workload and increasing the speed.

[0105] In actual maintenance work, after the first CT air chamber is covered, the air pressure of the adjacent air chambers can be adjusted according to the actual air chambers that need to be maintained, and the maintenance can be completed.

[0106] For further details, please refer to Figure 7 , Figure 7 This is a flowchart of a non-power-off maintenance method for GIS equipment. Figure 7 The steps described above can be found in the corresponding processes in the foregoing embodiments, and will not be repeated here.

[0107] In this embodiment, the first busbar air chamber is inflated to the rated pressure to restore the operation of the first busbar; the second busbar is de-energized for GIS equipment maintenance; while the first busbar is de-energized and the second busbar remains operational, the first disconnector air chamber is disconnected to create conditions for the first busbar to resume operation, and the operation of the first busbar is restored. Then the second busbar is de-energized again for GIS equipment maintenance. Throughout the entire process, at least one busbar is always in operation, and after entering the maintenance phase, the first busbar can remain operational, ensuring a reliable power supply to the power plant during GIS equipment maintenance.

[0108] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for uninterrupted maintenance of GIS equipment, characterized in that, include: The first busbar is de-energized, and the GIS bus tie bay equipment to be inspected is de-pressurized to reduce the air pressure in the first disconnector air chamber to a value that allows for safe disconnection, while keeping the second busbar running. Disconnect the first knife gate air chamber from the first CT air chamber and from the first busbar air chamber, respectively; Inflate the first busbar air chamber to the rated pressure and restore the first busbar operation; De-energize the second busbar and carry out maintenance on the GIS bus tie-up equipment. The specific steps of disconnecting the first knife gate air chamber from the first CT air chamber and from the first busbar air chamber are as follows: The first disconnector air chamber is hoisted and secured. Disconnect the tank connection between the first knife gate air chamber and the first CT air chamber, and disconnect the tank connection between the first knife gate air chamber and the first busbar air chamber, respectively. Measure the margin inside the first knife gate air chamber; Move the tank of the first knife gate air chamber according to the margin, and disconnect the connection of the conductor contact of the first knife gate air chamber; The specific method for measuring the margin inside the first knife gate air chamber is as follows: Measure the margins of the first knife gate air chamber in the vertical and horizontal directions; The vertical margin is determined based on the allowable expansion of the contact seat, contact finger, and spring. The horizontal margin is determined based on the distance between the inner wall of the knife gate tank and the internal conductor; The specific steps of moving the tank of the first knife gate air chamber according to the margin are as follows: The rotation margin of the first knife gate air chamber is calculated based on the margins in the vertical and horizontal directions. The movement trajectory of the first knife gate air chamber is determined based on the rotation margin. According to the movement trajectory, the hoisting equipment rotates the first knife switch air chamber, increasing the distance between the first knife switch air chamber and the first CT air chamber, as well as the disconnection point between the first knife switch air chamber and the first busbar air chamber, thus forming an operating opening.

2. The method for uninterrupted maintenance of GIS equipment according to claim 1, characterized in that, The voltage reduction process for the GIS busbar bay equipment is as follows: The air pressure in the first disconnector air chamber, the first CT air chamber, and the first busbar air chamber is reduced to the first air pressure, the air pressure in the circuit breaker air chamber is reduced to the second air pressure, the air pressure in the second CT air chamber is reduced to the third air pressure, and the air pressure in the second busbar air chamber is maintained at the rated pressure. The values ​​of the first air pressure, the second air pressure, and the third air pressure increase sequentially, with the first air pressure not less than atmospheric pressure and the third air pressure not greater than the rated air pressure.

3. The method for uninterrupted maintenance of GIS equipment according to claim 1, characterized in that, Before disconnecting the tank connection between the first knife gate air chamber and the first CT air chamber, the following steps are included: The location of the support point is determined based on the stress condition of the first CT air chamber; A support device is installed under the first CT air chamber according to the support point.

4. The method for uninterrupted maintenance of GIS equipment according to claim 1, characterized in that, The specific steps of filling the first busbar air chamber to the rated pressure and restoring the first busbar operation are as follows: A cover is installed at the disconnection point of the first busbar air chamber; Fill the first busbar gas chamber with SF6 gas until the pressure returns to the rated pressure; Set up density relay monitoring and alarm signals for the first busbar gas chamber to restore the operation of the first busbar.

5. The method for uninterrupted maintenance of GIS equipment according to claim 2, characterized in that, The specific steps for de-energizing the second busbar and performing GIS equipment maintenance are as follows: A cover is installed at the break point of the first CT air chamber; Fill the first CT chamber with SF6 gas until the pressure rises to the second pressure. De-energize the second busbar to reduce the gas pressure in the circuit breaker chamber to a level suitable for safe maintenance, and then carry out circuit breaker maintenance.

6. The method for uninterrupted maintenance of GIS equipment according to claim 5, characterized in that, Specifically, the pressure in the circuit breaker chamber is reduced to a value that allows for safe maintenance. The pressure in the circuit breaker chamber is reduced to the first pressure, the pressure in the second CT chamber is reduced to the second pressure, and the pressure in the second busbar chamber is reduced to the third pressure.

7. The method for uninterrupted maintenance of GIS equipment according to claim 1, characterized in that, The voltage reduction process for the GIS busbar bay equipment specifically includes: For the air chambers whose air pressure needs to be reduced, the air pressure is reduced simultaneously at the same rate, so that the air pressure in each air chamber drops to the value set for the depressurization process.

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