Generator enclosed busbar micro-positive pressure system
By renovating the air source of the micro-positive pressure system of the generator closed busbar, the lead-in instrument uses a compressed air bus tube as a daily gas source, which solves the problems of frequent air compressor start-up and the high frequency of device exit, and realizes the reliable operation and safe and stable operation of the micro-positive pressure system.
Patent Information
- Application Number
- CN202311323872.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-12
- Publication Date
- 2025-04-15
AI Technical Summary
In the micro-positive pressure system of the closed busbar of the generator, frequent start of the air compressor leads to frequent failure of the machine head, and the frequency of exit of the micro-positive pressure device is high, which poses safety hazards.
By modifying the air source of the micro positive pressure system, the nearby instrument uses a compressed air mother tube as a daily gas source and the original air compressor as a backup gas source. When the compressed air is abnormal in the instrument, the original air compressor is put into operation to ensure the reliable operation of the micro positive pressure system.
This reduces the frequent damage to the air compressor of the micro-positive pressure system and the device exits the operation, ensures the reliable operation of the micro-positive pressure system, and avoids the risk of moisture from the closed busbar.
Smart Images
Figure CN119826101A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of generators, and in particular relates to a generator closed bus micro-positive pressure system. Background Art
[0002] The condensation phenomenon of closed busbar under special climatic environment has always been a prominent problem affecting the safe and efficient operation of the busbar. Safety accidents such as flashover and breakdown caused by busbar condensation occur from time to time, causing huge economic losses and adverse social impacts to power plants. Therefore, it is necessary to ensure the safe and reliable operation of the closed busbar micro-positive pressure system, ensure that moisture and dust in the external environment cannot invade the closed busbar, and keep the working environment between insulators, casings and conductors clean and dry.
[0003] The air source of the generator closed bus micro-positive pressure system is supplied by a separate air compressor system, equipped with an air drying system, a pressure closed-loop feedback automatic control system, and outputs dry gas; outlet pressure: 300Pa-2500Pa; air compressor outlet pressure: 0.4Mpa-0.7Mpa; air inlet pipe diameter: G1 / 2〞, air supply pipe diameter: G1 / 2〞; power supply: AC380V 50Hz (three-phase four-wire system), operating conditions: ambient temperature 0-40℃ (indoor), relative humidity ≤85﹪.
[0004] The generator closed bus micro-positive pressure system is put into operation. When the pressure inside the generator closed bus is lower than 300Pa, the low-pressure control switch is turned on, and the pressure indicator light indicates a low-pressure signal. When the pressure inside the bus exceeds 2000-2500Pa, the high-pressure control switch is closed, the inflation indicator light indicates a high-pressure signal, and the air compressor stops automatically (the compressor starts and stops generally 8-10 times / h).
[0005] When the pressure in the bus is lower than 300Pa, the low-pressure control switch is turned on, and the pressure indicator light indicates a low-pressure signal; when the pressure in the bus exceeds 2000-2500Pa, the high-pressure control switch is closed, the inflation indicator light indicates a high-pressure signal, and the air compressor stops automatically (the compressor starts and stops 8-10 times / h). Due to the frequent startup of the air compressor, the air compressor head frequently fails, and the closed bus micro-positive pressure device exits frequently during the operation of the unit, which poses a hidden danger to the safe operation of the equipment. Summary of the invention
[0006] The purpose of the present invention is to provide a generator closed bus micro-positive pressure system in order to solve the above-mentioned problems.
[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:
[0008] A generator closed bus micro-positive pressure system comprises a control cabinet, an air storage tank, an air compressor and a compressed air main pipe connected to a compressed air source for instruments, wherein the control cabinet is connected to the closed bus, the air storage tank is connected to the control cabinet, the air compressor is connected to the air storage tank via a connecting pipe, and the compressed air main pipe is connected to the connecting pipe via an air source pipe.
[0009] As a further optimization solution of the present invention, a valve is provided on the gas source pipeline.
[0010] As a further optimization solution of the present invention, the number of the valves is three, two of which are close to the outlet of the compressed air main pipe, and the other valve is close to one side of the connecting pipe.
[0011] As a further optimization scheme of the present invention, the pressure of the instrument compressed air at the outlet of the compressed air main pipe is 0.65Mpa.
[0012] As a further optimization scheme of the present invention, the outlet pressure of the air compressor is 0.4Mpa-0.7Mpa.
[0013] The beneficial effects of the present invention are:
[0014] The present invention reduces the phenomenon of frequent damage of the air compressor of the micro-positive pressure system and the micro-positive pressure system quitting operation by modifying the air source of the closed bus micro-positive pressure system of the generator, thereby ensuring the reliable operation of the micro-positive pressure system. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION
[0016] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.
[0017] like Figure 1 As shown, a generator closed bus micro-positive pressure system includes a control cabinet, an air storage tank, an air compressor and a compressed air main pipe connected to a compressed air source for instruments, the control cabinet is connected to the closed bus and the air storage tank, the air compressor is connected to the air storage tank through a connecting pipe, and the compressed air main pipe is connected to the connecting pipe through an air source pipe.
[0018] The air source pipeline is provided with valves, and the number of the valves is three, two of which are close to the outlet of the compressed air main pipe, and the other valve is close to one side of the connecting pipeline.
[0019] The instrument compressed air pressure at the outlet of the compressed air main pipe is 0.65Mpa, and the air compressor outlet pressure is 0.4Mpa-0.7Mpa.
[0020] In this embodiment, after actual on-site inspection and demonstration, the air source is connected to the instrument compressed air main pipe near the micro positive pressure device, and the instrument compressed air is connected to the pipe connecting the original micro positive pressure device air compressor and the air storage tank, and the other micro positive pressure device equipment is not changed. The original air compressor is kept as a backup, which can ensure the normal operation of the closed busbar micro positive pressure device when the instrument compressed air is out of service, and prevent the busbar from getting wet.
[0021] Confirm the quality of the compressed air source for the planned instrument, and verify that the pressure of the compressed air for the instrument is 0.65Mpa, which is within the original air compressor outlet pressure range of 0.4Mpa-0.7Mpa. At the same time, confirm that the air source meets the requirements of being water-free and oil-free, and meets the air source requirements of the closed bus micro-positive pressure system.
[0022] During the unit maintenance time, the compressed air pipeline of the generator closed busbar micro-positive pressure system was laid. The gas source was connected from the nearest instrument compressed air pipeline mother pipe. The new gas source pipeline and the instrument compressed air mother pipe were welded. Two valves were installed at the mother pipe outlet. The new gas source pipeline was welded on the pipeline between the original micro-positive pressure device air compressor and the air storage tank, and a valve was installed on the gas source side. The rest of the micro-positive pressure device equipment was not changed, and the original air compressor was kept as a spare to ensure the normal operation of the closed busbar micro-positive pressure device when the instrument compressed air was shut down to prevent the busbar from getting damp.
[0023] The original intention of the present invention is to connect a new air source between the air compressor and the air storage tank of the original generator closed bus micro-positive pressure device system, and the new air source is used as the daily air source, and the original air compressor is kept as a standby. The compressed air source for the instrument is more reliable and can be used uninterruptedly for a long time, avoiding the frequent failure of the air compressor head caused by frequent startup of the air compressor, and the hidden dangers caused by the frequent exit of the micro-positive pressure device to the closed bus, reducing the phenomenon of frequent exit of the micro-positive pressure system, and ensuring the reliable operation of the micro-positive pressure system.
[0024] Principle description and usage:
[0025] (1) Connect the air source to the instrument compressed air main pipe near the micro positive pressure device, and connect the instrument compressed air to the connecting pipe between the original micro positive pressure device air compressor and the air storage tank. The other equipment of the micro positive pressure device remains unchanged.
[0026] (2) The newly connected instrument compressed air is used as the normal daily air source, and the original air compressor is kept as a backup. When the instrument compressed air has an abnormality, the original air compressor is put into operation to ensure the safe and reliable operation of the closed bus micro-positive pressure system, thereby ensuring the safe and stable operation of the closed bus and the unit.
[0027] The present invention has obvious effects after installation. Instrument compressed air is connected to the connecting pipe between the air compressor and the air storage tank of the original micro-positive pressure device, which reduces the frequency of the micro-positive pressure system exiting operation and improves the reliable operation of the closed bus micro-positive pressure system. After the closed bus micro-positive pressure system is optimized and modified, instrument compressed air is used for air supply, and the original air compressor is used as a backup air source. After the modification, the pressure of the micro-positive pressure system air storage tank is maintained at about 0.5Mpa, which meets the pressure requirements of the micro-positive pressure system, and can ensure that the generator closed bus micro-positive pressure system is always in operation when the group is running, ensuring the safe and stable operation of the generator closed bus.
[0028] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A generator closed busbar micro-positive pressure system, characterized in that: It includes a control cabinet, an air storage tank, an air compressor and a compressed air main pipe connected to a compressed air source for instruments, the control cabinet is connected to a closed bus, the air storage tank is connected to the control cabinet, the air compressor is connected to the air storage tank through a connecting pipe, and the compressed air main pipe is connected to the connecting pipe through an air source pipe.
2. A generator closed busbar micro-positive pressure system according to claim 1, characterized in that: The gas source pipeline is provided with a valve.
3. A generator closed busbar micro-positive pressure system according to claim 2, characterized in that: The number of the valves is three, two of which are close to the outlet of the compressed air main pipe, and the other valve is close to one side of the connecting pipeline.
4. A generator closed busbar micro-positive pressure system according to claim 1, characterized in that: The instrument compressed air pressure at the outlet of the compressed air main pipe is 0.65Mpa.
5. A generator closed busbar micro-positive pressure system according to claim 1, characterized in that: The outlet pressure of the air compressor is 0.4Mpa-0.7Mpa.