Generator set isolated-phase sealing mother system
By combining micro positive pressure and hot air circulation technology, the problem of the closed busbar being invaded by humid air is solved, rapid drying treatment and stable equipment operation are achieved, and the insulation processing speed and efficiency are improved.
Patent Information
- Application Number
- CN202421609188.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-07-09
AI Technical Summary
The existing micro-positive pressure system with off-phase closed busbar is susceptible to intrusion of humid air at the leakage point, resulting in insulator condensation and water accumulation, affecting the safety of the equipment, difficult to handle and affecting the start-up time.
Combining micro positive pressure technology and hot air circulation, through a compressed gas source, circulating gas treatment box and gas heater, dry and clean gas is provided and switched to hot air circulation mode when necessary, exhausting moisture and evaporating accumulated water, monitored with sensors and remote control.
The fast drying treatment of the closed busbar is realized, which eliminates safety risks, ensures stable operation of the equipment, and improves the insulation processing speed and efficiency.
Smart Images
Figure CN223052706U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power equipment, and specifically discloses a phase-separated enclosed bus system for a generator set. Background Art
[0002] At present, most coal chemical plants, steel plants, etc. in China are equipped with large generator sets. In order to avoid the influence of external environment on this part of power transmission, phase-separated enclosed busbars are used for power transmission. In addition, in order to prevent external moisture and dust from entering the phase-separated enclosed busbar, a micro-positive pressure regulation and control method is adopted for intervention, that is, dry and clean gas is provided to the enclosed busbar to make the air pressure inside the enclosed busbar slightly higher than the external atmospheric pressure to form an air seal, so as to avoid the entry of external moisture, dust and other impurities into the interior.
[0003] For example, the invention patent with the application number 2016102217394 discloses a micro-positive pressure system and a micro-positive pressure implementation method for a phase-separated enclosed busbar. The micro-positive pressure system includes a gas supply device, an oil separator, a system, a high-pressure cooling tank and a three-phase enclosed busbar; the air outlet of the gas supply device is connected to the air inlet of the oil separator, the air outlet of the oil separator is connected to the first air inlet of the micro-positive pressure device, the output port of the micro-positive pressure device is connected to the air inlet of the high-pressure cooling tank, the air outlet of the high-pressure cooling tank is connected to the second air inlet of the micro-positive pressure device, the air outlet of the micro-positive pressure device is connected to the air inlet of the three-phase enclosed busbar, and the air pressure sampling port of the three-phase enclosed busbar is connected to the air return port of the micro-positive pressure device. The gas supply device uses a power plant gas source or an oil-free air compressor. The invention adopts a micro-positive pressure device to make the air pressure inside the enclosed busbar higher than the outside, thus forming an air seal. However, when there is a large leak at the upper part of the enclosed busbar of the disc insulator and the micro-positive pressure device is not normally put into operation, there is a possibility that external rainwater or humid air enters the enclosed busbar, and condensation occurs on the surface of the insulator. The rainwater and the condensed water may even flow to the upper part of the disc insulator. If a large amount of accumulated water fails to be discharged in time until it submerges the disc insulator, it will eventually cause the busbar to discharge to the ground through the accumulated water on the surface of the insulator, resulting in a shutdown accident. In addition, the lowest part of the soft connection of the three support insulators on the circumferential direction of the phase-separated enclosed busbar is prone to moisture condensation, resulting in a decrease in the insulation of the busbar to an unqualified level, and it is difficult to handle and takes a long time, affecting the startup time. Based on the above deficiencies of the existing micro-positive pressure system for phase-separated enclosed busbars, this application proposes a micro-positive pressure device for a generator set phase-separated enclosed busbar that can completely solve the above problems. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a generator set phase-separated enclosed bus system to solve the technical problems raised in the background art of the existing micro-positive pressure system for phase-separated enclosed busbars.
[0005] The utility model is realized through the following technical solutions:
[0006] A phase-separated enclosed busbar system for a generator set, comprising a three-phase enclosed busbar, disc insulators, support insulators and a slightly positive pressure device. The disc insulators are arranged on the vertical section of the three-phase enclosed busbar, the support insulators are arranged on the horizontal section of the three-phase enclosed busbar, a drain pipe aligned with the bottom of the disc insulators is arranged on the vertical section of the three-phase enclosed busbar, and a drain valve is installed on the drain pipe;
[0007] The slightly positive pressure device includes a compressed air source, a circulating gas treatment tank and a gas heater. The compressed air source is connected to the circulating gas treatment tank through a pipeline. The air outlet end of the circulating gas treatment tank is connected with a gas delivery pipe. The end of the gas delivery pipe is respectively connected to a three-way valve and a gas heater through a three-way pipe. The gas heater is connected to the three-way valve through a pipeline. The air outlet end of the three-way valve is provided with an air delivery pipe connected to the three-phase enclosed busbar. A return air pipe is arranged between the three-phase enclosed busbar and the circulating gas treatment tank.
[0008] As a further setting of the above solution, a pressure sensor and a humidity sensor are arranged on the three-phase enclosed busbar. The pressure sensor and the humidity sensor are electrically connected to a remote control terminal. The gas heater and the on-off control valve are electrically connected to the remote control terminal.
[0009] As a further setting of the above solution, the compressed air source includes a pipeline compressed air source and an oil-free air compressor. Both the pipeline compressed air source and the oil-free air compressor are connected to the circulating gas treatment tank through pipelines, and the oil-free air compressor is electrically connected to the remote control terminal.
[0010] As a further setting of the above solution, a gas pre-filter is arranged between the compressed air source and the circulating gas treatment tank, and a filter and drying module is arranged inside the circulating gas treatment tank.
[0011] As a further setting of the above solution, the air delivery pipe is connected to the A-phase and C-phase in the three-phase enclosed busbar. The A-phase and C-phase are connected to the B-phase in the three-phase enclosed busbar through pipelines. The return air pipe is connected between the B-phase and the circulating gas treatment tank.
[0012] As a further setting of the above solution, the air delivery pipe is connected to the three-phase enclosed busbar near the position of the support insulator through a branch pipe.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0014] The phase-separated enclosed bus system of this generator set combines the slightly positive pressure technology with the hot air circulation. During normal operation, it uses the slightly positive pressure control method to intervene, providing dry and clean gas to the enclosed bus, making the air pressure inside the enclosed bus slightly higher than the external atmospheric pressure to form an air seal, thus preventing external wet air, dust and other impurities from entering the interior. When it is found that the humidity inside the phase-separated enclosed bus is too high, it can switch to the hot air circulation mode to introduce dry hot air into it to evaporate and remove the water vapor, ensuring the dryness effect inside the phase-separated enclosed bus, completely eliminating the major safety hazards caused by excessive humidity of the insulators, and ensuring the stable operation of the factory power generation equipment. In addition, for the problem that rainwater and liquefied accumulated water inside the phase-separated enclosed bus are difficult to drain, the drain valve can be directly opened to quickly drain all of them. Coupled with the effect of hot air circulation drying, it can quickly carry out the drying treatment, making the insulation moisture treatment effect of the phase-separated enclosed bus of the generator set better and the treatment speed greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0016] Figure 1 It is the front view plane structure schematic diagram of the present utility model;
[0017] Figure 2 It is the top view plane structure schematic diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] In order to enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0019] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the attached Figures 1 - 2 drawings and describe this application in detail in conjunction with the embodiments. Embodiment 1
[0020] Embodiment 1 discloses a phase-separated busbar sealing system for a generator set, including a three-phase enclosed busbar 1 and a micro-positive pressure device 9. Among them, the A phase, the B phase and the C phase in the three-phase enclosed busbar 1 are arranged side by side, and disc insulators 2 are arranged on the vertical sections of the A phase, the B phase and the C phase located outdoors, and then a drainage hole with a diameter of 30 mm is opened on the outer shell of the three-phase enclosed busbar 1 at the lowest point of the disc insulator 2, and the outer end of the drainage hole is connected to a downwardly arranged drainage pipe 3 through a flange seat, and a drainage valve 4 is installed on the drainage pipe 3. By opening the drainage valve 4, the collected water above the disc insulator 2 can be smoothly discharged, and it is convenient to seal it during the subsequent closed operation process.
[0021] Three supporting insulators 5 are evenly arranged on the circumferential surface of the shell of phase A, phase B and phase C located indoors. At the same time, pressure sensors 6 and humidity sensors 7 are also arranged on the circumferential surface of the shell of phase A, phase B and phase C. The pressure sensor 6 and the humidity sensor 7 are electrically connected to the remote control terminal 8, so that the air pressure value and humidity value in the three-phase closed bus 1 can be transmitted to the remote control terminal 8 in real time.
[0022] The micro-positive pressure device 9 includes a pipeline compressed gas source 901, an oil-free air compressor 902, a circulating gas treatment box 903 and a gas heater 904. The pipeline compressed gas source 901 and the oil-free air compressor 902 are connected to a gas pre-filter 905 through a pipeline, and the pipeline compressed gas source 901 and the oil-free air compressor 902 are designed as one open and one standby. Then the gas outlet of the gas pre-filter 905 is connected to the circulating gas treatment box 903. The interior of the circulating gas treatment box 903 is provided with a corresponding filter drying module 9031, and then the gas outlet end of the circulating gas treatment box 903 is connected to an air supply pipe 906, and the ends of the air supply pipe 906 are respectively connected to a three-way reversing valve 907 and a gas heater 904 through a three-way pipe, and the gas outlet end of the gas heater 904 is connected to the other gas inlet end of the three-way reversing valve 907 through a pipeline.
[0023] The gas outlet of the three-way reversing valve 907 is connected with a gas delivery pipe 908, and then the gas delivery pipe 908 is connected with the A phase and the C phase in the three-phase closed busbar 1. In the specific design, the gas delivery pipe 908 is arranged as close as possible to the position of the support insulator 5 through a branch pipe, so that the compressed gas delivered can act on the soft-connected support insulator 5 at the first time to dry and remove the moisture attached to the support insulator 5. The ends of the A phase and the C phase are connected to the B phase through a pipeline, and then the return gas pipe 909 is connected to the other end of the B phase, and finally the return gas pipe 909 is connected to the circulating gas treatment box 903.
[0024] In addition, in order to realize remote monitoring and control of the phase-seated mother micro-positive pressure device of the entire generator set, the oil-free air compressor 902, the three-way reversing valve 907 and the gas heater 904 will also be electrically connected to the remote control terminal 8.
[0025] When the phase-separated enclosed bus device of the generator set disclosed in Embodiment 1 operates normally, compressed gas is provided by the pipeline compressed air source 901. After being filtered and decontaminated by the gas pre-filter 905, it enters the circulating gas treatment tank 903. The filter drying module 9031 in the circulating gas treatment tank 903 performs secondary filtration and drying, and then is directly sent into the A-phase and C-phase interiors of the three-phase enclosed bus 1 through the air supply pipe 906, the three-way reversing valve 907, and the gas transmission pipe 908. Then, the compressed air pressure enters the B-phase interior through the pipeline, and finally circulates back to the circulating gas treatment tank 903 through the return air pipe 909 for filtration and drying treatment, ensuring that the A-phase, B-phase, and C-phase in the three-phase enclosed bus 1 are all in a slightly positive pressure state to prevent external moisture, dust, and other impurities from entering the three-phase enclosed bus 1.
[0026] In rainy and humid weather, due to the installation of insulators, the sealing performance at the connection may be poor, and wet air and rainwater may enter the three-phase enclosed bus 1. The rainwater or the accumulated water formed by the liquefaction of wet air entering the three-phase enclosed bus 1 will accumulate above the disc insulator 2. At this time, the operator can quickly drain it by opening the drain valve 4 on the drain pipe 3, and then close the drain valve 4 after draining.
[0027] At the same time, when the pressure sensor 6 and the humidity sensor 7 detect that the air pressure value in the three-phase enclosed bus 1 is lower than the set value and the internal gas humidity is greater than the set value, they will be real-time feedback to the remote control terminal 8, and the remote control terminal 8 will issue an alarm to remind the operator to switch to the hot air circulation state in time.
[0028] After starting the hot air circulation state, the end of the three-way reversing valve 907 connected to the gas heater 904 is connected. Then, the air flow returned from the return air pipe 909 is filtered and dried by the circulating gas treatment tank 903, first sent into the gas heater 904 to heat it up to the set temperature, and then sent into the three-phase enclosed bus 1 through the three-way reversing valve 907 and the gas transmission pipe 908 to form a hot air flow. The internal residual water is evaporated through the hot air flow, and then circulates into the circulating gas treatment tank 903 for drying. After running for a period of time, the internal dry state can be ensured; at the same time, the gas flow sent by the road compressed air source 901 or the oil-free air compressor 902 can be appropriately increased to ensure that the interior of the three-phase enclosed bus 1 always maintains a slightly positive pressure state.
[0029] The above is only the preferred embodiment of the present invention, and it is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A phase-separated busbar system for a generator set, comprising a three-phase enclosed busbar, a disc insulator, a support insulator and a micro-positive pressure device, wherein the disc insulator is arranged in the vertical section of the three-phase enclosed busbar, and the support insulator is arranged in the horizontal section of the three-phase enclosed busbar, characterized in that: A drainage pipe aligned with the bottom of the disc insulator is provided on the vertical section of the three-phase enclosed busbar, and a drainage valve is installed on the drainage pipe; The micro-positive pressure device includes a compressed gas source, a circulating gas treatment box and a gas heater. The compressed gas source is connected to the circulating gas treatment box through a pipeline. The gas outlet end of the circulating gas treatment box is connected to an air supply pipe. The ends of the air supply pipe are respectively connected to a three-way reversing valve and a gas heater through a three-way pipe. The gas heater is connected to the three-way reversing valve through a pipeline. The gas outlet end of the three-way reversing valve is provided with a gas supply pipe connected to a three-phase closed busbar. A return air pipe is provided between the three-phase closed busbar and the circulating gas treatment box.
2. The generator set phase separation sealing system according to claim 1, characterized in that: The three-phase closed busbar is provided with an air pressure sensor and a humidity sensor, the air pressure sensor and the humidity sensor are electrically connected to a remote control terminal, and the gas heater and the control valve are electrically connected to the remote control terminal.
3. The generator set phase separation sealing system according to claim 2, characterized in that: The compressed air source includes a pipeline compressed air source and an oil-free air compressor. The pipeline compressed air source and the oil-free air compressor are both connected to the circulating gas processing box through a pipeline, and the oil-free air compressor is electrically connected to the remote control terminal.
4. The generator set phase separation sealing system according to claim 1 or 3, characterized in that: A gas pre-filter is arranged between the compressed gas source and the circulating gas processing box, and a filtering and drying module is arranged inside the circulating gas processing box.
5. The generator set phase separation sealing system according to claim 1, characterized in that: The gas transmission pipe is connected to phase A and phase C in the three-phase closed busbar, and phase A and phase C are connected to phase B in the three-phase closed busbar through pipelines. The return gas pipe is connected between phase B and the circulating gas processing box.
6. The generator set phase separation sealing system according to claim 1, characterized in that: The gas transmission pipe is connected to the three-phase closed busbar near the supporting insulator through a branch pipe.