CN216122095U - Excitation AC/DC bus insulation lifting system - Google Patents
Excitation AC/DC bus insulation lifting system Download PDFInfo
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- CN216122095U CN216122095U CN202120375501.3U CN202120375501U CN216122095U CN 216122095 U CN216122095 U CN 216122095U CN 202120375501 U CN202120375501 U CN 202120375501U CN 216122095 U CN216122095 U CN 216122095U
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- 230000005284 excitation Effects 0.000 title claims abstract description 121
- 238000009413 insulation Methods 0.000 title claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 238000005192 partition Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 238000009423 ventilation Methods 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 230000006872 improvement Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 description 8
- 230000005494 condensation Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to the technical field of excitation alternating current and direct current seal bus insulation protection, in particular to an excitation alternating current and direct current bus insulation lifting system. The device is characterized in that an excitation variable-pressure area is arranged in one layer of machine room, an excitation transformer is arranged in the excitation variable-pressure area, a roller shutter gate is arranged at the inlet of the excitation variable-pressure area, a sealing mechanism is arranged at the bottom of the roller shutter gate, a dehumidifying device is arranged on one side of the excitation transformer, a fixed air heater is arranged at the vertical section of an excitation direct-current sealing female cooling ventilation duct in the two layers of machine rooms, a sealing part is arranged at the joint of an excitation direct-current sealing female expansion joint, and a partition device is arranged in an air supply channel. The gain effect of the utility model is: through the improvement and the application of the system, the improvement and the maintenance of the insulation performance of the excitation AC and DC seal nuts can be efficiently finished, the time and the labor are saved, and the influence on the grid connection of the unit is reduced.
Description
Technical Field
The utility model relates to the technical field of excitation alternating current and direct current seal nut insulation protection, in particular to an excitation alternating current and direct current seal nut insulation lifting system.
Background
After an AC/DC bus of a generator excitation system of a southern coastal power plant stops running, insulation is seriously reduced, the insulation of an excitation AC bus at the excitation low-voltage side is usually only below 0.1 MOmega and sometimes even is as low as zero when measured before the generator is prepared to start, and a megger basically does not raise voltage. The requirement of normal starting of the machine above 0.9 MOmega is not met; meanwhile, the insulation of an excitation direct current bus from an excitation chamber to a carbon brush of the generator is also very low, the insulation is often only 0.2-0.3M omega, the requirement of normal start-up is not met, the two sections of buses are of a closed bus structure, a heat tracing cable in the closed bus is always put into operation, and the insulation lifting effect is basically not generated.
Therefore, after the generator is shut down to before the generator is started, the AC/DC seal bus of the excitation system needs to be manually additionally provided with high-power air heaters at a plurality of positions to bake the bus and the excitation transformer, so that the insulation level of the excitation AC/DC bus is kept and improved, and the requirement of starting the generator is met. By adopting the mode, a large amount of personnel is needed for operation and supervision, much time is consumed, and the method is labor-consuming and unsafe.
Disclosure of Invention
The utility model aims to solve the problems in the prior art and provides an excitation AC/DC seal nut insulation lifting system which can improve the insulation reliability of a generator excitation system, reduce manpower and reduce unsafe risks.
In order to achieve the technical purpose, the technical scheme of the utility model is as follows:
an excitation AC/DC bus insulation lifting system comprises a steam turbine room which is of a three-layer structure and comprises a first-layer steam turbine room, a second-layer steam turbine room and a third-layer steam turbine room, an excitation voltage-changing area is arranged in the first-layer machine room, an excitation transformer is arranged in the excitation voltage-changing area, a roller shutter gate is arranged at the inlet of the excitation voltage-changing area, the bottom of the rolling shutter gate is provided with a sealing mechanism, one side of an excitation transformer is provided with a dehumidifying device, an excitation chamber is arranged in the two-layer machine room, the dehumidifying device is arranged in the excitation chamber, a fixed air heater is arranged at the vertical section of an excitation direct current seal mother cooling ventilation duct which is connected with the excitation chamber and the three layers of machine rooms, a sealing part is arranged at the interface of the excitation direct current seal female expansion joint, a partition device is arranged in an air supply channel which is connected with the excitation carbon brush holder of the generator and is arranged in the two-layer machine room, and a generator excitation carbon brush holder are arranged in the three-layer machine room, and the bottom of the generator excitation carbon brush holder is connected with an air supply channel.
Preferably, the dehumidifier is a dehumidifier.
Preferably, the sealing mechanism comprises a sealing rubber strip arranged at the bottom of the roller shutter door and a sealing threshold arranged on the lower ground correspondingly.
Preferably, the sealing threshold is arranged in parallel with the sealing rubber strip.
Preferably, the partition means is a rotating partition plate.
Preferably, the first-layer steam turbine room is a 0-meter steam turbine room, the second-layer steam turbine room is a 7.5-meter steam turbine room, and the third-layer steam turbine room is a 15-meter steam turbine room.
Compared with the prior art, the gain effect of the utility model is as follows:
(1) the excitation transformer area is subjected to sealing transformation, a roller shutter gate and a dehumidifier are additionally arranged in the excitation transformer area, after the excitation transformer of the unit is stopped, the excitation transformer area becomes a closed room by closing the roller shutter gate, and the dehumidifier is arranged in the room to keep the room dry and keep the room in a certain humidity, so that the excitation transformer insulation is not influenced by external moisture after the stop of the operation. The damping device can reduce the probability that the excitation transformer and the upper-end low-voltage outgoing line seal nut are damped, and meanwhile, the excitation transformer of a 0-meter steam turbine room can be reduced by multiple measures of additionally installing an air heater, opening a cover plate to damp the excitation transformer from the upper low-voltage outgoing line, reducing manpower and improving efficiency.
(2) There is the air supply passageway that is used for rotor collecting ring cooling and row carbon dust in 7.5 meters steam turbine room, obviously have a large amount of wind to flow backward and insufflate when shutting down, influence the system insulation, through installing the off device additional in the middle of the air supply passageway, the steerable off device of unit outage back cuts off the air current of flowing backward from the air supply passageway, the steerable off device of unit impulse back opens and resets, open the observation window through the manual work before improving relatively and install additional and demolish the baffle, resume the observation window again, the work efficiency is improved, reduce the manpower.
(3) A fixed air heater is arranged at the vertical section of a cooling ventilation duct of an excitation direct-current seal nut of a 7.5-meter steam turbine room, and the insulation performance of the excitation direct-current seal nut can be kept according to starting and stopping of a fan, so that the insulation treatment efficiency of the position is improved, and the manpower is reduced.
(4) The air conditioner runs in the excitation chamber, the temperature difference between the inside and the outside of the excitation chamber needs to be reduced after the machine is shut down, and meanwhile, the dehumidifier is additionally arranged in the excitation chamber, so that the air humidity is reduced, and the condensation probability is reduced. The insulation of the sealing nut at the position can be kept by processing according to the scheme, the insulation is not required to be processed by a manual hot air blower, the sealing part is additionally arranged at the joint of the expansion joint of the excitation direct current sealing nut, the temperature difference of the air inside and outside the excitation chamber can be further reduced, and the condensation probability is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic plan view of an excitation voltage transformation area according to the present invention.
Description of reference numerals:
the system comprises a first-layer steam turbine room-1, a second-layer steam turbine room-2, a third-layer steam turbine room-3, an excitation voltage transformation area-4, an excitation transformer-5, a roller shutter gate-6, a dehumidifying device-7, an excitation chamber-8, an excitation direct current seal mother cooling ventilation duct-9, a fixed air heater-10, an air supply channel-11 and a partition device-12.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
To further clarify the objects, features and functions of the present invention, a review board will be provided by referring to the following description of the preferred embodiments in conjunction with the accompanying drawings:
referring to fig. 1-2, the utility model is an excitation ac/dc bus insulation lifting system, comprising a steam turbine room, the steam turbine room is a three-layer structure, comprising a first layer steam turbine room 1, a second layer steam turbine room 2 and a third layer steam turbine room 3, an excitation voltage-changing area 4 is arranged in the first layer steam turbine room, an excitation transformer 5 is arranged in the excitation voltage-changing area 4, a roller shutter gate 6 is arranged at the entrance of the excitation voltage-changing area, a sealing mechanism is arranged at the bottom of the roller shutter gate 6, a dehumidifying device 7 is arranged at one side of the excitation transformer 5, an excitation chamber 8 is arranged in the second layer steam turbine room, a dehumidifying device 7 is arranged in the excitation chamber 8, a fixed hot air blower 10 is arranged at the vertical section of an excitation dc seal cooling ventilation duct 9 connecting the excitation chamber 8 and the third layer steam turbine room, a sealing part is arranged at the interface of the excitation dc seal expansion joint, a partition device 12 is arranged in an air supply duct 11 connecting an excitation carbon brush holder of a generator in the second layer steam turbine room, and a generator excitation carbon brush holder are arranged in the three-layer machine room, and the bottom of the generator excitation carbon brush holder is connected with the air supply channel 11.
Preferably, the dehumidifying device 7 is a dehumidifier.
Preferably, the sealing mechanism comprises a sealing rubber strip arranged at the bottom of the roller shutter door 6 and a corresponding sealing threshold arranged on the ground below.
Preferably, the sealing threshold is arranged in parallel with the sealing rubber strip.
Preferably, the partition means 12 is a rotating partition plate.
Preferably, the first-layer steam turbine room 1 is a 0-meter steam turbine room, the second-layer steam turbine room 2 is a 7.5-meter steam turbine room, and the third-layer steam turbine room 3 is a 15-meter steam turbine room.
The specific working principle is as follows:
the reason and the solution method for low insulation of the excitation AC seal nut are as follows:
excitation variable-voltage area 4 and low pressure seal mother side design install in 0 meters one deck steam turbine room 1 and are located circulating water secondary filter screen hole, decide the cooling water system next door, and the environment is more moist, has many ventilation louver on the outer wall on every side, and rainwater and outside moisture get into main building very easily, therefore when equipment stopped transport, excitation variable-voltage area 4 wets very easily, leads to insulating very low.
Sealing transformation is carried out on an excitation transformation area, a roller shutter door 6 is additionally arranged at an inlet of an excitation transformation area 4, after the excitation transformation of the unit is stopped, the excitation transformation area 4 becomes a closed room by closing the roller shutter door 6, a sealing mechanism is arranged at the bottom of the roller shutter door 6, the sealing performance of an interface between the roller shutter door 6 and the ground is improved by a sealing rubber strip arranged at the bottom of the roller shutter door 6 and a sealing threshold arranged at the corresponding ground below,
meanwhile, a dehumidifier 7-a dehumidifier is arranged in the excitation voltage changing area 4 to keep the room dry and keep the room in a certain humidity, so that the excitation voltage changing insulation is not influenced by external moisture after the operation is stopped.
The reason that the excitation direct current seals the mother and insulates lowly: the excitation carbon brush holder insulating part of the generator is affected by external moisture after shutdown to damp and excite the indoor air conditioner to enable the excitation seal nut to be easily condensed due to large temperature difference to affect insulation.
The method for solving the low insulation of the excitation direct current seal nut comprises the following steps:
an air supply channel 11 for cooling a rotor collecting ring and discharging carbon powder is designed at the bottom of a generator excitation carbon brush holder of a 15-meter platform of a three-layer steam turbine room 3, an air inlet of the air supply channel 11 is arranged indoors in a 7.5-meter two-layer steam turbine room, and an air outlet of the air supply channel 11 is arranged outdoors in the 7.5-meter two-layer steam turbine room. As shown in figure 1, due to the ventilation design of a main factory building, a large amount of wind obviously flows back and forth at the air outlet of the air supply channel 11 below the excitation carbon brush holder of the generator when the generator is shut down, the air humidity of the coastal power plant is high, and moisture also flows back and enters the lower part of the excitation carbon brush holder of the generator from the air supply channel 11, so that the insulation performance of the insulation plate of the excitation carbon brush holder of the generator is greatly reduced. Therefore, the partition device 12 is additionally arranged in the middle of the air supply channel 11, after the unit is stopped, the partition device 12 is controlled to be started, so that external damp air is prevented from flowing back to the excitation carbon brush holder of the generator, meanwhile, the fixed air heater 10 is arranged at the air inlet of the vertical section of the excitation direct current seal mother cooling air channel 9, and the fixed air heater is put into operation after the unit is stopped, so that the excitation carbon brush holder of the generator is kept dry.
The inside of an excitation chamber 8 of a power plant is operated by an air conditioner, the temperature is low, the sealing nut has obvious temperature difference inside and outside the excitation chamber 8, and after the machine is stopped, the outside air is easy to invade because the bus has no current and the temperature of the sealing nut is reduced. Whether condensation occurs depends on two basic elements of the occurrence of condensation: humidity and temperature difference; the greater the humidity of the incoming air, the less temperature difference is required for the moisture in the air to form condensation on the surfaces of the equipment. And in conclusion, measures for reducing condensation are adopted: firstly, the humidity of the air is reduced; secondly, the temperature difference is reduced.
Therefore, a dehumidifying device 7 is added in the excitation chamber 8, wherein the dehumidifying device 7 is preferably a dehumidifier, the humidity of the air in the excitation chamber 8 is reduced, a sealing part is arranged at the interface of the primary expansion joint of the excitation direct current seal, the temperature difference of the air inside and outside the excitation chamber 4 is reduced, and the condensation probability is reduced.
Before implementing this patent technique, the power plant closes the back at the unit and gets out of the engine before, because generator excitation is handed over, direct current seals mother, excitation and becomes the body and receive damp insulation and reduce, is close 0M omega even, need in time improve insulating before getting out of the engine, usually becomes the cabinet in the excitation and artificially installs the air heater and drives damp, needs open excitation step-down to press the side to seal mother partial apron and dry even. When the unit is ready to be flushed, the unit needs to be immediately evacuated and the hot air blower needs to be recovered, the traditional operation mode wastes time and labor, and the efficiency is low.
Through the improvement of this patent system, can accomplish excitation AC, the improvement and the maintenance of direct current seal mother insulating properties high-efficiently, save time and manpower reduce the influence that is incorporated into the power networks to the unit.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. An excitation AC/DC bus insulation lifting system comprises a steam turbine room, and is characterized in that the steam turbine room is of a three-layer structure and comprises a first-layer steam turbine room, a second-layer steam turbine room and a third-layer steam turbine room, an excitation voltage changing area is arranged in the first-layer steam turbine room, an excitation transformer is arranged in the excitation voltage changing area, a roller shutter gate is arranged at the inlet of the excitation voltage changing area, a sealing mechanism is arranged at the bottom of the roller shutter gate, a dehumidifying device is arranged on one side of the excitation transformer, an excitation chamber is arranged in the second-layer steam turbine room, a dehumidifying device is arranged in the excitation chamber, a fixed air heater is arranged at the vertical section of an excitation DC seal bus cooling ventilation duct connected with the third-layer steam turbine room in the excitation chamber, a sealing part is arranged at the interface of an excitation DC seal bus expansion joint, a partition device is arranged in an air supply passage connected with an excitation carbon brush frame of a generator in the second-layer steam turbine room, and a carbon brush frame of the generator are arranged in the third-layer steam turbine room, the bottom of the generator excitation carbon brush holder is connected with an air supply channel.
2. The excitation AC/DC bus insulation lifting system as recited in claim 1, wherein said dehumidifier is a dehumidifier.
3. The excitation alternating current-direct current bus insulation lifting system according to claim 1, wherein the sealing mechanism comprises a sealing rubber strip arranged at the bottom of the roller shutter door and a corresponding sealing threshold arranged on the ground below.
4. The excitation alternating current-direct current bus bar insulation lifting system according to claim 3, wherein the sealing threshold is arranged in parallel with the sealing rubber strip.
5. The excitation alternating current-direct current bus insulation lifting system as claimed in claim 1, wherein the partition device is a rotary partition plate.
6. The excitation alternating current-direct current bus insulation lifting system according to claim 1, wherein the first-layer steam turbine room is a 0-meter steam turbine room, the second-layer steam turbine room is a 7.5-meter steam turbine room, and the third-layer steam turbine room is a 15-meter steam turbine room.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120375501.3U CN216122095U (en) | 2021-02-18 | 2021-02-18 | Excitation AC/DC bus insulation lifting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120375501.3U CN216122095U (en) | 2021-02-18 | 2021-02-18 | Excitation AC/DC bus insulation lifting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216122095U true CN216122095U (en) | 2022-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120375501.3U Active CN216122095U (en) | 2021-02-18 | 2021-02-18 | Excitation AC/DC bus insulation lifting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216122095U (en) |
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2021
- 2021-02-18 CN CN202120375501.3U patent/CN216122095U/en active Active
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