CN211350324U - Explosion-proof pressure release system of transformer - Google Patents
Explosion-proof pressure release system of transformer Download PDFInfo
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- CN211350324U CN211350324U CN202020088931.2U CN202020088931U CN211350324U CN 211350324 U CN211350324 U CN 211350324U CN 202020088931 U CN202020088931 U CN 202020088931U CN 211350324 U CN211350324 U CN 211350324U
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Abstract
The utility model relates to an explosion-proof pressure release system of transformer. The structure of the transformer oil tank is that a main rupture disk is arranged on the transformer oil tank and connected with a pressure relief channel and a sealing structure which are isolated from air, and the sealing structure can be a secondary rupture disk, a corrugated pressure relief tank or a corrugated oil conservator. The main rupture disk can be rapidly broken to release pressure when the pressure of the transformer reaches a dangerous value, and the discharged high-temperature inflammable oil gas enters a pressure release channel which is vacuumized in advance or filled with flame-retardant gas or enters an oil storage cabinet isolated from the atmosphere. The device can realize quick accurate pressure release, and the pressure release process is kept apart with the air, avoids transformer explosion and fire to realize directional oil extraction, avoid hidden danger and pollution, and the oil extraction process is controllable.
Description
Technical Field
The utility model relates to an explosion-proof pressure release system of transformer specifically is when the transformer takes place the serious failure, avoids transformer tank fracture through quick pressure release, and the instinct air isolation prevents the explosion and fires.
Background
The transformer is a key device of a power grid and is also a large-scale oil-filled device, when the transformer breaks down, the internal pressure is rapidly increased, if the pressure is not timely released, an oil tank is cracked, and the combustible gas generated by internal discharge can cause explosion and fire, so that the whole transformer substation and the surrounding environment are endangered. Therefore, effective and safe pressure relief means are important measures for ensuring the safety of the transformer substation.
The existing transformer adopts a pressure relief valve arranged on the upper cover of a transformer oil tank to realize pressure relief, and the fire accidents of the existing transformer are displayed, so that the pressure relief response speed and the pressure relief capacity of the existing pressure relief valve are insufficient, and the overpressure cracking of the transformer oil tank is caused; meanwhile, the pressure relief valve discharges high-temperature combustible gas generated by discharge of the transformer during pressure relief, and explosion and fire are easily caused if the pressure relief valve contacts air. The existing transformer pressure relief device and related patents are not isolated from air, so that great hidden dangers exist, and the explosion accidents of the transformer are related to the hidden dangers. Therefore, the core thinking points of realizing safe pressure relief of the transformer and avoiding malignant accidents are to rapidly relieve pressure, discharge oil and exhaust air directionally and avoid air contact to ignite explosion.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide an explosion-proof pressure release system of transformer, the device realizes quick pressure release through the rupture disk that sets up to through the sealed chamber of pressure release, the isolation air avoids explosion and fire, and realizes directional oil extraction, avoids hidden danger and pollution, and the oil extraction process is controllable.
For solving the above problems, the specific technical scheme of the utility model is as follows: an explosion-proof pressure relief system of a transformer is characterized in that a pressure relief channel is connected to a transformer oil tank, a main rupture disc is connected to the joint of the pressure relief channel and the transformer oil tank or connected to the pressure relief channel, and an insulating medium is sealed in the transformer oil tank by the main rupture disc; and a pressure relief channel behind the main rupture disk is connected with a sealing structure, and a pressure relief sealing cavity is formed between the sealing structure and the main rupture disk.
The pressure relief sealed cavity is vacuumized or filled with flame retardant gas.
The sealing structure adopts a pressure relief tank or a corrugated core body which is arranged in the pressure relief tank and used for isolating air.
The sealing structure adopts a secondary rupture disk structure.
And a normally open pneumatic valve or electric valve is connected in series on the pressure relief channel behind the main rupture disk.
And an additional pressure relief channel provided with a normally closed pneumatic valve or electric valve is connected outside the pressure relief channel in parallel.
The sealing structure is an oil conservator, and the transformer oil tank and the oil conservator are isolated and sealed by the main rupture disk.
A secondary rupture disk isolated from the atmosphere or a large-caliber breathing opening is arranged on a breathing cavity cover plate of the oil storage cabinet.
And a pressure relief channel behind the main rupture disk is connected with a corrugated pipe.
And the main blasting sheet is provided with a blast alarm switch, and the signal of the switch is used as one of the conditions of transformer power failure or fire-fighting system starting.
The beneficial effect of this scheme: this scheme can realize that transformer internal pressure releases pressure and oil extraction fast safely when reaching the setting value. The device is provided with a rupture disc and a pressure relief channel to discharge combustible oil gas into a sealed pressure relief channel or a pressure relief tank which is vacuumized or filled with flame-retardant gas, so that the combustible oil gas can be prevented from contacting air; the tail end of the pressure relief channel adopts a sealing structure which can be a sealing membrane or a pressure relief tank and the like.
By adopting the sealing diaphragm and arranging the negative pressure support, the vacuum pumping is met, and the secondary pressure relief of the diaphragm can be realized. The volume of the pressure relief tank can be increased by evacuating or filling flame-retardant gas, and the corrugated pipe is used as a sealing compensation element of the pressure relief tank in the pressure relief tank, so that the pressure relief can be quickly responded in a state of being isolated from the atmosphere, and the pressure relief can be completed.
Set up two rupture disks on the pressure release passageway, can improve the reliability of sealed and pressure release, can also realize simultaneously that the exhaust oil gas of first pressure release does not contact with the air in the pipeline, if the pressure release secondary pressure release again inadequately.
The pneumatic or electric valve arranged on the pressure relief channel can close the pressure relief channel after the rupture disk is opened, so that oil discharge is stopped, and loss is reduced. The pressure relief channels connected in parallel are arranged, so that oil can be discharged under the condition that the rupture disk is not started, and the adaptability of various requirements and the reliability of oil discharge are improved.
Pressure release channel with transformer tank and oil conservator UNICOM to keep apart with the rupture disk, can realize when the occurence of failure arrange oil to the oil conservator in, both realize pressure release under the encapsulated situation, avoid the explosion on fire, the insulating oil that does not run off again, also more environmental protection. The corrugated connecting pipe is arranged on the pressure relief channel, so that the installation is convenient, and the rupture disk is convenient to replace. Set up rupture disk or increase respiratory orifice pipe diameter on the apron of the respiratory cavity of oil conservator and atmosphere isolation, can guarantee the quick response pressure release of oil conservator.
The main blasting sheet is provided with the blast alarm switch, and the signal of the switch is used as one of the conditions of the transformer power failure or the starting of the fire-fighting system, so that the safety of the transformer can be further ensured.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a second embodiment of the present application.
Fig. 3 is a schematic diagram of a third structure according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of the fourth embodiment of the present application.
Fig. 5 is a schematic structural diagram of a fifth embodiment of the present application.
Fig. 6 is a schematic diagram of a sixth structure according to an embodiment of the present application.
Number in the figure: 1. flange I, 2, main rupture disk, 3, flange II, 4, bellows, 5, pressure release passageway, 6, flange III, 7, secondary rupture disk, 8, flange IV, 9, reserve even mouthful 10, pressure release jar, 11, ripple core, 12, normally open motorised valve, 13, normally closed motorised valve.
Detailed Description
Example one
As shown in figure 1, the transformer explosion-proof pressure relief system is characterized in that a pressure relief channel is arranged on the upper cover of a transformer oil tank or on the side wall close to the upper cover of the transformer oil tank, and is sequentially connected with a main rupture disk 2, a corrugated pipe 4 and a secondary rupture disk 7 through flanges, and insulating oil is led to an oil storage pool of a transformer through the pressure relief channel. The main rupture disk 2 is tightly clamped and sealed through a flange I1 and a flange II 3, the flange II 3 is welded with a corrugated pipe 4, the other end of the corrugated pipe 4 is welded with a pressure relief channel 5, a flange III 6 is welded on the lower portion of a pressure relief pipeline 5, and a flange 6 III and a flange IV 8 tightly clamp a secondary rupture disk 7. When the transformer breaks down and generates high voltage, the main rupture disk 2 is exploded to release the pressure, and if the pressure is insufficient, the secondary rupture disk 7 is exploded again to release the pressure. The standby connecting port 9 is used for vacuumizing the pressure relief channel or filling nitrogen or other inert gases into the pressure relief channel after vacuumizing, and the pressure relief channel 5 between the main rupture disk 2 and the secondary rupture disk 7 forms a pressure relief sealed cavity, so that the situation that combustible gas contacts air to cause fire and explosion after the main rupture disk 2 is opened can be avoided.
Example two
As shown in FIG. 2, the explosion-proof pressure relief system for transformer has the same structure as the first embodiment except that a pressure relief tank 10 is connected to the end of a pressure relief channel 5 as a sealing structure. The pressure relief tank 10 can be a sealed empty tank, or can be provided with a corrugated core body 11 for isolating the atmosphere, wherein the standby connecting port 9 is used for vacuumizing the pressure relief channel and the pressure relief tank or filling nitrogen or other inert gases after vacuumizing, so that the situation that the combustible gas contacts the air to cause fire and explosion after the main rupture disk 2 is opened can be avoided. The main rupture disk 2 seals the insulating oil in the transformer oil tank, when the transformer breaks down and generates high voltage, the main rupture disk 2 is exploded to release the pressure, and the combustible oil gas enters the pressure release channel and the pressure release tank, and is isolated from the atmosphere by the corrugated core body 11 and is rapidly released.
When setting up ripple core 11 in the pressure release tank, can adopt two kinds of connected modes, one of them mode is given to figure 2, the first ripples of terminal surface and pressure release tank bottom end plate seal weld under the ripple core promptly, and ripple core inner chamber communicates with each other with the atmosphere, and ripple core upper end is the activity terminal surface, and space and atmosphere between ripple core surface and the pressure release tank inner surface are kept apart, and ripple core 11 stretches to the longest during the evacuation of pressure release tank. When the transformer breaks down and generates high pressure, the main rupture disk 2 is exploded to release pressure, and combustible oil gas enters the pressure release channel and the pressure release tank, is isolated by the corrugated core body 11 and is compressed rapidly to complete pressure release.
The other connecting mode of arranging the corrugated core body 11 in the pressure relief tank is as follows: the first wave of 11 up ends of ripple core and pressure release jar up end plate seal weld, the ripple core inner chamber communicates with each other with the pressure release passageway, and the ripple core keeps apart atmosphere and pressure release passageway, and the ripple core pressfitting is to the shortest when connecting port 9 through reserve evacuation to pressure release passageway and pressure release jar. When the transformer breaks down and generates high pressure, the main rupture disk 2 is exploded to release pressure, combustible oil gas enters the pressure release channel and the corrugated core body in the pressure release tank, and the corrugated core body 11 isolates the atmosphere and rapidly stretches and releases the pressure. The bottom of the pressure relief tank is provided with an opening, so that air is discharged from the opening when the corrugated core body extends.
EXAMPLE III
As shown in FIG. 3, the explosion-proof pressure relief system of the transformer has the same structure as the first embodiment except that the pipeline is welded at the lower part of the division flange 8 and enters the oil storage pool. The main rupture disk 2 seals the insulating oil in the transformer oil tank, when the transformer breaks down and generates high voltage, the main rupture disk 2 is exploded to release the pressure, and if the pressure release is insufficient, the secondary rupture disk 7 is exploded again to release the pressure. The corrugated pipe 4 can facilitate installation of a pipeline and replacement of the rupture disk, and the standby connecting port 9 is used for vacuumizing the pressure relief channel or filling flame-retardant gas such as nitrogen after vacuumizing, so that the rupture disk 2 can be prevented from being ignited and exploded when being contacted with air after being opened. If the transformer has serious faults, the rupture disk 7 is also opened, and explosion and fire can be avoided due to the fact that oxygen in the pipeline is less and the pipeline is long in cooling effect.
To facilitate rupture disc inspection and replacement, a butterfly valve may be provided before the main rupture disc 2.
The scheme needs the spare connecting port on the upper part of the transformer, so that the transformer is suitable for being used as a new transformer and is directly installed in a manufacturing plant. For the existing transformer without reserved connection ports, power failure transformation is needed or embodiment four is adopted.
Example four
As shown in fig. 4, in the explosion-proof pressure relief system of the transformer, a normally open electric valve 12 is connected to an outlet of an original oil drain gate valve at the lower part of the side wall of a transformer oil tank, and then a main rupture disk 2, a corrugated pipe 4, a pressure relief channel 5, a secondary rupture disk 7 and a pipeline leading to an oil storage pool are sequentially connected. Original oil drain valve is opened to the transformer normal during operation, lets normally open electric valve 12 be in normally open state simultaneously, and insulating oil is sealed through main rupture disk 2, and rupture disk 7 plays the secondary seal effect to secondary pressure release when main rupture disk 2 pressure release is not enough. When the transformer breaks down and produces the high pressure, main rupture disk 2 explodes the pressure release, if the pressure release is not enough, inferior rupture disk 7 explodes the pressure release once more, if the transformer is in safe state after the pressure release, can close the oil extraction through normally opening electric valve 12. The normally open electric valve 12 can be remotely controlled in a control room; the normally open electric valve 12 can be changed into a pneumatic valve and is provided with a driving air source.
EXAMPLE five
As shown in fig. 5, an explosion-proof pressure relief system for transformer is provided with another parallel oil discharge pipe on the basis of the fourth embodiment, and the normally closed electric valve 13 is connected to the pressure relief channel, so as to remotely control oil discharge when the pressure is lower than the opening pressure of the rupture disk, thereby satisfying various requirements of users and improving the reliability of oil discharge. The normally closed electric valve 13 can be remotely controlled in a control room, and the normally closed electric valve 13 can also be changed into a pneumatic valve and needs to be provided with a driving air source.
EXAMPLE six
As shown in fig. 6, in the explosion-proof pressure relief system for the transformer, a pressure relief channel is arranged on an upper cover plate of a transformer oil tank and connected to an oil storage cavity of an oil conservator, and the oil storage cavity is used as a sealing structure at the rear end of the pressure relief channel. The oil conservator can be various oil conservators, wherein, the oil conservator adopts an external oil vertical type oil conservator with large cross section and good pressure resistance. Connect main rupture disk 2 and bellows 4 on the pressure release passageway, main rupture disk 2 keeps apart the transformer with the oil conservator, and bellows 4 plays the effect of conveniently connecting and being convenient for change rupture disk. The upper cover of the breathing cavity of the oil storage cabinet can be provided with a secondary rupture disk 7, or a breathing opening of the breathing cavity communicated with the atmosphere is changed into a large caliber, so that the pressure relief response resistance is reduced. When the transformer high pressure appears, inside main rupture disk 2 on the pressure release passageway explodes the pressure release to the oil conservator earlier, if the pressure release is not enough, secondary rupture disk 7 on the breathing cavity explodes the pressure release once more.
The pressure relief channel in the embodiment is usually selected to have a diameter phi of 120-250 mm, and the opening pressure of the rupture disk can be selected to be 0.06-0.1 MPa.
The rupture disk in the above embodiment is a sealing membrane that can be ruptured instantly at a set pressure, and can be made of metal materials such as stainless steel, copper, aluminum, and the like, or non-metal materials such as glass, oil-resistant rubber, plastic, resin, and the like, and can be made into an arch shape or a weakening zone is preset on the rupture disk to ensure the opening size. The arched one-way rupture disk compounded by stainless steel and polytetrafluoroethylene can realize accurate rupture, has reliable performance and is provided with a negative pressure support, and the requirements of transformer vacuumizing and pressure relief channel vacuumizing are met. The burst pressure of the main burst disc can be selected according to the pressure-resistant capacity of the transformer oil tank, a value between the pressure higher than the opening pressure of the pressure release valve and the pressure lower than the pressure-resistant capacity of the transformer oil tank is usually selected, and the burst pressure of the secondary burst disc can also be determined according to the requirement of a user, and the opening pressure of the secondary burst disc is usually selected to be lower than the opening pressure of the pressure release valve, and is usually 0.02-0.06 MPa. The explosion piece can be connected with a touch switch, a magnetic control switch or a pull wire (with) switch and the like, and is used for indicating the explosion state of the explosion piece, and further, an explosion alarm signal of the explosion piece can be used as one of the conditions of the power failure of the transformer or the starting of a fire protection system, and is used for controlling the power failure of the transformer and the starting of the fire protection system of the transformer.
Claims (10)
1. The utility model provides an explosion-proof pressure release system of transformer which characterized in that: connecting a pressure relief channel on the transformer oil tank, and connecting a main rupture disk at the joint of the pressure relief channel and the transformer oil tank or connecting the main rupture disk on the pressure relief channel, wherein the main rupture disk seals an insulating medium in the transformer oil tank; and a pressure relief channel behind the main rupture disk is connected with a sealing structure, and a pressure relief sealing cavity is formed between the sealing structure and the main rupture disk.
2. The transformer explosion-proof pressure relief system of claim 1, wherein: the pressure relief sealed cavity is vacuumized or filled with flame retardant gas.
3. The transformer explosion-proof pressure relief system of claim 2, wherein: the sealing structure adopts a pressure relief tank or a corrugated core body which is arranged in the pressure relief tank and used for isolating air.
4. The transformer explosion-proof pressure relief system of claim 2, wherein: the sealing structure adopts a secondary rupture disk structure.
5. The transformer explosion-proof pressure relief system of claim 4, wherein: and a normally open pneumatic valve or electric valve is connected in series on the pressure relief channel behind the main rupture disk.
6. The transformer explosion-proof pressure relief system of claim 5, wherein: and an additional pressure relief channel provided with a normally closed pneumatic valve or electric valve is connected outside the pressure relief channel in parallel.
7. The transformer explosion-proof pressure relief system of claim 1, wherein: the sealing structure is an oil conservator, and the transformer oil tank and the oil conservator are isolated and sealed by the main rupture disk.
8. The transformer explosion-proof pressure relief system of claim 7, wherein: a secondary rupture disk isolated from the atmosphere or a large-caliber breathing opening is arranged on a breathing cavity cover plate of the oil storage cabinet.
9. The transformer explosion-proof pressure relief system of any one of claims 1 to 8, wherein: and a pressure relief channel behind the main rupture disk is connected with a corrugated pipe.
10. The transformer explosion-proof pressure relief system of claim 1, wherein: and the main blasting sheet is provided with a blast alarm switch, and the signal of the switch is used as one of the conditions of transformer power failure or fire-fighting system starting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020088931.2U CN211350324U (en) | 2020-01-16 | 2020-01-16 | Explosion-proof pressure release system of transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020088931.2U CN211350324U (en) | 2020-01-16 | 2020-01-16 | Explosion-proof pressure release system of transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145817A (en) * | 2020-10-13 | 2020-12-29 | 祁东中燃城市燃气发展有限公司 | Gas collecting pipeline of natural gas |
| CN112178305A (en) * | 2020-10-13 | 2021-01-05 | 祁东中燃城市燃气发展有限公司 | Natural gas conveying pipeline and explosion venting method thereof |
| CN112542298A (en) * | 2020-12-02 | 2021-03-23 | 北京中瑞和电气有限公司 | Explosion-proof pressure relief transformer |
-
2020
- 2020-01-16 CN CN202020088931.2U patent/CN211350324U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145817A (en) * | 2020-10-13 | 2020-12-29 | 祁东中燃城市燃气发展有限公司 | Gas collecting pipeline of natural gas |
| CN112178305A (en) * | 2020-10-13 | 2021-01-05 | 祁东中燃城市燃气发展有限公司 | Natural gas conveying pipeline and explosion venting method thereof |
| CN112542298A (en) * | 2020-12-02 | 2021-03-23 | 北京中瑞和电气有限公司 | Explosion-proof pressure relief transformer |
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