CN111029102A - Pressure releasing device and pressure releasing method for corrugated transformer - Google Patents
Pressure releasing device and pressure releasing method for corrugated transformer Download PDFInfo
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- CN111029102A CN111029102A CN202010045191.9A CN202010045191A CN111029102A CN 111029102 A CN111029102 A CN 111029102A CN 202010045191 A CN202010045191 A CN 202010045191A CN 111029102 A CN111029102 A CN 111029102A
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- pressure
- transformer
- corrugated
- releaser
- oil
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
Abstract
The invention relates to a pressure releasing device of a corrugated transformer.A corrugated pressure releaser is arranged on an oil tank of the transformer or a pressure releasing channel connected with the oil tank, when the internal pressure of the transformer reaches a specific value, a limiting device of the corrugated pressure releaser releases the restraint on corrugations, and the corrugations quickly absorb the internal expansion of the transformer to reduce the internal high pressure of the transformer. The ripple pressure releaser can also be connected to the external or directional oil drain port of the existing pressure relief valve of the transformer; or the corrugated pressure releaser is isolated by the rupture disk when connected with the transformer, the rupture disk is opened at specific pressure, and the corrugated pressure releaser releases pressure again when the pressure is insufficient. The corrugated oil conservator can be used as a pressure releaser, and the transformer oil tank is connected with the oil conservator through a pressure relief channel and is isolated by a rupture disk. This corrugated transformer pressure relief device can realize the pressure release under sealed condition, avoids pressure release exhaust oil gas and air contact, takes place the explosion on fire.
Description
Technical Field
The invention relates to a pressure release device of a corrugated transformer and a pressure release method thereof, belonging to a protection device of a transformer, which can avoid the cracking of a transformer oil tank and prevent explosion and fire.
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 reliable pressure relief means are important measures for ensuring the safety of the transformer substation.
The existing transformer adopts a pressure relief valve arranged on a transformer oil tank to realize pressure relief. Multiple transformer fire accidents are shown, the current pressure relief valve has insufficient pressure relief response speed and pressure relief capacity, and the transformer oil tank is subjected to overpressure cracking; meanwhile, when the pressure relief valve is used for relieving pressure, combustible gas generated by discharge of the transformer can be discharged at the same time, and the high-temperature combustible gas is very easy to cause explosion and fire due to contact with air. Therefore, the quick pressure relief, the directional oil discharge and exhaust and the avoidance of air contact to ignite explosion are important means for avoiding the occurrence of malignant accidents of the transformer.
Disclosure of Invention
The invention provides a pressure relief device of a corrugated transformer and a pressure relief method thereof, wherein the pressure relief device of the corrugated transformer adopts a corrugated pressure relief device, when the internal pressure of the transformer reaches a set value, pressure relief and oil discharge are carried out rapidly, and pressure relief under a sealing condition is realized, so that the contact between oil gas discharged by pressure relief and air is avoided, and fire and explosion are prevented.
In order to solve the problems, the invention creates the following specific technical scheme: a corrugated pressure releaser is arranged on a transformer oil tank or a pressure relief channel connected with the oil tank, when the pressure in the transformer reaches a set value, the corrugations of the corrugated pressure releaser quickly absorb the internal expansion of the transformer, and the high pressure in the transformer is reduced.
The corrugated pressure releaser is arranged on the periphery of a pressure release valve of the transformer or a directional oil discharge pipeline at an outlet of the pressure release valve, and when the pressure release valve is opened, insulating oil and combustible gas in the transformer enter the corrugated pressure releaser.
The corrugated pressure releaser consists of a corrugated pipe, an upper cover, a lower cover and a limiting mechanism; two ends of the corrugated pipe are respectively welded with the upper cover and the lower cover in a sealing way, and a limiting mechanism is arranged between the upper cover and the lower cover; when the pressure in the transformer reaches a set value, the limiting mechanism is released, and the corrugated pipe rapidly relieves the high pressure in the transformer by increasing the volume.
The corrugated pressure releaser is arranged on a connecting port of an upper cover or a side wall of the transformer oil tank, and a rupture disc is arranged to isolate the inside of the transformer oil tank from the inside of the corrugated pressure releaser.
The transformer oil tank outside have the transformer and store up oil tank, ripple pressure release sets up in the gasbag of transformer oil tank, ripple pressure release passes through pressure release channel and is connected with the transformer oil tank to keep apart through rupture disc or pressure relief valve.
The limiting mechanism is composed of a pull rod, a pull wire, a lock catch, a screw nut or a bayonet lock which can meet the requirement of certain tension disconnection, and is made of conductive materials to form a power supply loop of the relay.
The corrugated pressure releaser is replaced by a corrugated core body in a transformer oil storage cabinet, the oil storage cabinet is connected with a transformer oil tank through a pressure relief channel, and an oil way in the pressure relief channel is isolated through a rupture disc or a pressure release valve.
A pressure relief method for a burst transformer oil tank after pressurization by adopting a corrugated transformer pressure relief device comprises the following steps:
1) the pressure of the transformer oil tank is increased, and high-pressure oil acts on the corrugated pressure releaser;
2) when the pressure reaches the set pressure, the limiting mechanism releases the limiting, the corrugated pipe is unfolded, and the expansion in the transformer is absorbed;
3) the expansion signal of the corrugated pipe is used as one of the conditions for cutting off the transformer, discharging oil for starting the transformer and injecting nitrogen into the transformer.
A pressure relief method of a pressure relief device of a corrugated transformer after the pressure relief device boosts a sudden transformer oil tank comprises the following steps:
1) the pressure of the transformer oil tank rises, high-pressure oil acts on a rupture disc at the front end of the corrugated pressure releaser, and when the pressure reaches a set pressure, the rupture disc is broken to release the pressure;
2) or after the rupture disk is broken to release the pressure, when the pressure of the transformer oil tank still does not meet the requirement, the corrugated pressure releaser continues to release the pressure, so that the high pressure in the transformer is reduced;
3) the expansion signal of the corrugated pipe is used as one of the conditions for cutting off the transformer, discharging oil for starting the transformer and injecting nitrogen into the transformer.
By adopting the structure, the pressure relief device of the corrugated transformer realizes quick pressure relief and oil discharge when the internal pressure of the transformer reaches a set value, and simultaneously realizes pressure relief under a sealing condition, avoids the contact of oil gas discharged by pressure relief and air, and prevents fire and explosion; the ripple pressure releaser not only realizes the pressure relief under the sealing state, avoids the fire explosion, but also does not run off the insulating oil, is more environment-friendly, can realize that the transformer occupies small space when normally working, and can quickly respond to the pressure relief when breaking down. The expansion limiting device of the corrugated pressure releaser can ensure that the corrugated pressure releaser expands under the set pressure, realize the function of expansion alarm, and can also use the signal as one of the conditions of transformer power failure and transformer oil discharge and nitrogen injection.
The corrugated pressure release device arranged outside the pressure release valve can ensure that the insulating oil and combustible gas discharged after the pressure release valve is opened are in a sealed state. The transformer oil tank can be reliably sealed and accurately decompressed through the rupture disk;
the ripple pressure releaser is arranged in an air bag of the transformer oil conservator, so that the breathing cavity space in the ripple oil conservator can be fully utilized, and the occupation of the external space of the transformer is reduced;
the transformer oil tank passes through the pipe connection ripple and stores up the oil tank to keep apart through the rupture disk, the function of ripple pressure release ware is replaced by the ripple gasbag in the transformer stores up the oil tank, can realize more reliably, safer, more save space, has avoided insulating oil to lose and to environmental pollution.
Drawings
Fig. 1-1 is a schematic structural diagram of a first embodiment of the present application.
Fig. 1-2 are schematic structural diagrams of another 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 structural diagram of a third embodiment of the present application.
Fig. 4 is a schematic structural diagram of a 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 structural diagram of a sixth embodiment of the present application.
Number in the figure: 1. a lower cover; 2. A bellows; 3. an upper cover; 4. A limiting mechanism; 5. a drain plug; 6. An access cover; 7. a rupture disk; 8. corrugated connecting pipe.
Detailed Description
Example one
A pressure relief channel is arranged on the upper cover (figure 1-1) of a transformer oil tank or the side wall (figure 1-2) close to the upper cover, and is connected with a corrugated pressure relief device through a flange. Ripple pressure release includes lower cover 1, bellows 2, upper cover 3 and stop gear 4, 2 both ends of bellows respectively with upper cover 3 and 1 seal weld of lower cover, ripple pressure release passes through pipeline and flange joint and sealed with the transformer tank, set up between upper cover 3 and the lower cover 1 and expand stop gear 4, when the transformer internal pressure reaches the setting value, stop gear 4 releases, closed bellows 2 expandes in the twinkling of an eye, alleviate high pressure in the transformer, trigger alarm switch output signal simultaneously.
When the internal pressure of the corrugated pressure releaser reaches a set value, the limiting mechanism is opened, and the corrugation is unfolded, namely, the limiting mechanism of the corrugated pressure releaser is disconnected or disengaged when the limiting mechanism of the corrugated pressure releaser reaches a certain value under the action of blind plates at two ends of the corrugation, and the corrugated pipe is rapidly unfolded under the action of pressure to absorb the internal expansion of the transformer. The limiting mechanism is composed of a pull rod, a pull wire, a lock catch or a thread buckle which can be disconnected when a certain pulling force is reached, and is made of conductive materials to form a power supply loop of the relay.
The corrugated pressure releaser can also be arranged on an oil discharge pipe of the oil discharge and nitrogen injection system of the transformer or an oil discharge pipe at the lower part of an oil tank of the transformer.
The opening pressure of the expansion limiting mechanism of the corrugated pressure releaser in the scheme is usually designed to be 60-100 KPa, is slightly higher than the opening pressure of the pressure release mechanism of the transformer, and can be lower or higher than the value according to the requirements of users. The bellows of a bellows pressure relief is typically made of thin-walled stainless steel.
Example two
As shown in figure 2, the periphery of a pressure release valve of an upper cover of a transformer oil tank is connected with a corrugated pressure releaser, a lower cover component of the corrugated pressure releaser and a pressure release valve base are connected on the upper cover of the transformer oil tank together, and the upper cover of the corrugated pressure releaser is provided with an openable access cover 6, so that the maintenance of the pressure release valve is facilitated. When the internal pressure of the transformer reaches the opening pressure value of the pressure release valve, the pressure release valve is opened to release pressure, the insulating oil enters the corrugated pressure releaser, and if the pressure is continuously increased to reach the set expansion pressure of the corrugated pressure releaser, the corrugated pressure releaser is expanded to release pressure again.
The lower cover of the corrugated pressure releaser can be provided with an oil drain plug 5 for draining oil, and for higher requirements, the corrugated pressure releaser can also be used for evacuating or injecting inert gases such as nitrogen, and the air pressure is normal pressure. The deployment starting pressure of the corrugated pressure releaser in the scheme can be set to be slightly lower than the opening pressure of the pressure releaser, and is usually 50-30 KPa.
EXAMPLE III
As shown in fig. 3, a pressure relief device for a corrugated transformer is connected to a directional oil discharge line at the outlet of a pressure relief valve of an upper cover of the transformer, or in the case of a pressure relief valve having a directional oil discharge cover, the corrugated pressure relief device may be connected to a directional oil discharge port of the pressure relief valve through a pipe. When the internal pressure of the transformer reaches the opening pressure value of the pressure release valve, the pressure release valve is opened to release pressure, the insulating oil enters the pipeline and the corrugated pressure releaser, and if the pressure is continuously increased to reach the set expansion pressure of the corrugated pressure releaser, the corrugated pressure releaser expands to release pressure.
The upper cover of the corrugated pressure releaser can be provided with an oil drain plug 5 for draining oil, and for higher requirements, the corrugated pressure releaser can also be used for evacuating or injecting inert gases such as nitrogen, and the air pressure is normal pressure. The deployment starting pressure of the corrugated pressure releaser in the scheme can be set to be slightly lower than the opening pressure of the pressure release valve, namely 50-30 KPa.
Example four
As shown in fig. 4, in a pressure relief device of a corrugated transformer, a rupture disk 7 is added between an upper cover of a transformer tank and a corrugated pressure relief device on the basis of the first embodiment. The rupture disk 7 is arranged at the connecting port of the upper cover of the transformer oil tank or on a pipeline connected with the oil tank, the rupture disk 7 seals insulating oil in the transformer, when the internal pressure of the transformer reaches a rupture pressure value set by the rupture disk, the rupture disk ruptures and releases the pressure, the insulating oil enters a pipeline communicated with the corrugated pressure releaser, if the pressure is continuously increased to reach an expansion pressure set by the corrugated pressure releaser, the corrugated pressure releaser expands and releases the pressure, the high voltage in the transformer is reduced, and a corrugated pipe expansion signal is used as one of the conditions that the transformer is powered off and the transformer is started to discharge oil and inject nitrogen into the transformer.
The upper cover of the corrugated pressure releaser can be provided with an oil drain plug 5 for draining oil, and for higher requirements, the corrugated pressure releaser can also be used for vacuumizing or injecting inert gases such as nitrogen, and the air pressure is normal pressure. The opening pressure of the rupture disk in the scheme can be set to be consistent with that of the pressure relief valve, namely 55KPa, and the expansion starting pressure of the corrugated pressure releaser can be set to be slightly lower than the opening pressure of the pressure relief valve, namely 50-30 KPa.
EXAMPLE five
As shown in FIG. 5, a pressure relief device for a corrugated transformer is provided, in which a rupture disk and a pipeline are connected to a corrugated pressure relief device in a transformer conservator at an upper cover of a transformer oil tank. The ripple pressure release ware in the oil conservator sets up in the breathing chamber, in the ripple gasbag promptly (ripple formula) or in the capsule (capsule formula), the rupture disc sets up on transformer tank upper cover mouth of connecting department or the pipeline of being connected with the oil tank, the rupture disc is sealed with the insulating oil in the transformer, when transformer internal pressure reaches rupture disc and opens the pressure release when setting value pressure value, insulating oil gets into the pipeline with ripple pressure release ware UNICOM, if pressure lasts to increase when reaching the expansion pressure that ripple pressure release ware set for, ripple pressure release ware expandes the pressure release.
An oil drain plug 5 can be arranged on a pipeline at the rear end of the rupture disk for draining oil, and can also be used for evacuating or injecting inert gases such as nitrogen and the like for higher requirements, wherein the air pressure is normal pressure. The opening pressure of the rupture disk in the scheme can be set to be consistent with that of the pressure relief valve, namely 55KPa, and the expansion starting pressure of the corrugated pressure releaser can be set to be slightly lower than the opening pressure of the pressure relief valve, namely 50-30 KPa. The rupture disk described in this embodiment may also be replaced with a pressure relief valve.
The corrugated pressure releaser can be designed to be consistent with the shape of a breathing cavity in the oil conservator, for example, when an external oil vertical corrugated oil conservator is adopted, the corrugated pressure releaser is also designed to be in a runway shape, and the expansion length can be 300-400mm due to the large cross section.
EXAMPLE six
As shown in FIG. 6, the pressure relief device for the corrugated transformer is characterized in that a rupture disk 7 and a pipeline are connected to a corrugated oil conservator oil tank of the transformer on an upper cover of the oil tank of the transformer, and a corrugated core body in the corrugated oil conservator is used as a corrugated pressure relief device. The rupture disk is arranged at the connecting opening of the upper cover of the transformer oil tank or on a pipeline connecting the oil tank with the oil conservator, and the rupture disk seals the insulating oil in the transformer. When the internal pressure of the transformer reaches the rupture disk rupture set pressure value, the rupture disk ruptures and releases pressure, the insulating oil enters a pipeline communicated with the corrugated oil storage cabinet and is absorbed through the change of the length of the corrugated core body, and the pressure release function is completed. The method fully utilizes the oil storage function of the oil conservator, saves space, avoids insulating oil waste and is environment-friendly. When the method is adopted, the capacity of the oil conservator is properly increased.
The corrugated connecting pipe 8 and the valve (which is opened during working) can be arranged on the pipeline at the rear end of the rupture disk, so that the rupture disk is convenient to install and replace. The burst disk rupture pressure in this scenario can be set to coincide with the pressure relief valve, i.e., 55 KPa. The rupture disk described in this embodiment may also be replaced with a pressure relief valve.
In the first to sixth embodiments, the diameter of the pressure relief channel is generally 150 to 250mm, the inner diameter of the corrugated pressure release device is selected from 300 to 500mm, the expansion length is selected from 1000 to 3000mm according to the weight of the transformer oil, the elastic reaction force of the corrugated pressure release device when the corrugated pressure release device is expanded to the maximum is controlled to be below 40KPa, and the expanded corrugated pipe is not cracked.
The expansion signal of the corrugated pipe can be used as one of the conditions of the transformer power failure, the transformer oil discharge starting and the nitrogen injection into the transformer so as to start the subsequent emergency measures.
The rupture disk in the above embodiment is a sealing membrane which 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 resin and the like, and can be made into an arch shape or a weak 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, thereby meeting the requirement of vacuum pumping of the transformer. The bursting pressure of the rupture disk can be selected according to the pressure-resistant capacity of the transformer oil tank, usually, the value between the opening pressure of the pressure relief valve and the pressure-resistant capacity of the transformer oil tank, namely 60-90KPa, can also be determined according to the requirement of a user. The rupture disk can be connected with a touch switch, a magnetic control switch or a pull wire (belt) switch and the like for indicating the rupture state of the rupture disk.
The transformer in this patent application refers to all kinds of power equipment that adopt insulating medium.
Claims (9)
1. The utility model provides a corrugated transformer pressure relief device which characterized in that: the ripple pressure releaser is arranged on the transformer oil tank or on the pressure relief channel connected with the oil tank, and when the pressure in the transformer reaches a set value, the ripple of the ripple pressure releaser rapidly absorbs the internal expansion of the transformer, so that the high voltage in the transformer is reduced.
2. A corrugated transformer pressure relief device as claimed in claim 1, wherein: the corrugated pressure releaser is arranged on the periphery of a pressure release valve of the transformer or a directional oil discharge pipeline at an outlet of the pressure release valve, and when the pressure release valve is opened, insulating oil and combustible gas in the transformer enter the corrugated pressure releaser.
3. A corrugated transformer pressure relief device according to claim 1 or 2, characterized in that: the corrugated pressure releaser consists of a corrugated pipe, an upper cover, a lower cover and a limiting mechanism; two ends of the corrugated pipe are respectively welded with the upper cover and the lower cover in a sealing way, and a limiting mechanism is arranged between the upper cover and the lower cover; when the pressure in the transformer reaches a set value, the limiting mechanism is released, and the corrugated pipe rapidly relieves the high pressure in the transformer by increasing the volume.
4. A corrugated transformer pressure relief device according to claim 3, wherein: the corrugated pressure releaser is arranged on a connecting port of an upper cover or a side wall of the transformer oil tank, and a rupture disc is arranged to isolate the inside of the transformer oil tank from the inside of the corrugated pressure releaser.
5. A corrugated transformer pressure relief device according to claim 3, wherein: the transformer oil tank outside have the transformer and store up oil tank, ripple pressure release sets up in the gasbag of transformer oil tank, ripple pressure release passes through pressure release channel and is connected with the transformer oil tank to keep apart through rupture disc or pressure relief valve.
6. A corrugated transformer pressure relief device according to claim 3, wherein: the limiting mechanism is composed of a pull rod, a pull wire, a lock catch, a screw nut or a bayonet lock which can meet the requirement of certain tension disconnection, and is made of conductive materials to form a power supply loop of the relay.
7. A corrugated transformer pressure relief device as claimed in claim 1, wherein: the corrugated pressure releaser is replaced by a corrugated core body in a transformer oil storage cabinet, the oil storage cabinet is connected with a transformer oil tank through a pressure relief channel, and an oil way in the pressure relief channel is isolated through a rupture disc or a pressure release valve.
8. A method for relieving pressure after a sudden transformer tank is pressurized by using the corrugated transformer pressure relief device of claim 3, which is characterized by comprising the following steps:
1) the pressure of the transformer oil tank is increased, and high-pressure oil acts on the corrugated pressure releaser;
2) when the pressure reaches the set pressure, the limiting mechanism releases the limiting, the corrugated pipe is unfolded, and the expansion in the transformer is absorbed;
3) the expansion signal of the corrugated pipe is used as one of the conditions for cutting off the transformer, discharging oil for starting the transformer and injecting nitrogen into the transformer.
9. A method for pressure relief after pressurization of a sudden transformer tank by using the corrugated transformer pressure relief device of claim 4, 5 or 7, characterized by comprising the following steps:
1) the pressure of the transformer oil tank rises, high-pressure oil acts on a rupture disc at the front end of the corrugated pressure releaser, and when the pressure reaches a set pressure, the rupture disc is broken to release the pressure;
2) or after the rupture disk is broken to release the pressure, when the pressure of the transformer oil tank still does not meet the requirement, the corrugated pressure releaser continues to release the pressure, so that the high pressure in the transformer is reduced;
3) the expansion signal of the corrugated pipe is used as one of the conditions for cutting off the transformer, discharging oil for starting the transformer and injecting nitrogen into the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010045191.9A CN111029102A (en) | 2020-01-16 | 2020-01-16 | Pressure releasing device and pressure releasing method for corrugated transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010045191.9A CN111029102A (en) | 2020-01-16 | 2020-01-16 | Pressure releasing device and pressure releasing method for corrugated transformer |
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| CN111029102A true CN111029102A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010045191.9A Pending CN111029102A (en) | 2020-01-16 | 2020-01-16 | Pressure releasing device and pressure releasing method for corrugated transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648417A (en) * | 2020-12-16 | 2021-04-13 | 国家电网有限公司 | Pressure release device of power equipment |
| CN113077968A (en) * | 2021-03-25 | 2021-07-06 | 陕西理工大学 | Electric automatic voltage regulating transformer |
-
2020
- 2020-01-16 CN CN202010045191.9A patent/CN111029102A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648417A (en) * | 2020-12-16 | 2021-04-13 | 国家电网有限公司 | Pressure release device of power equipment |
| CN112648417B (en) * | 2020-12-16 | 2023-03-14 | 国家电网有限公司 | Pressure release device of power equipment |
| CN113077968A (en) * | 2021-03-25 | 2021-07-06 | 陕西理工大学 | Electric automatic voltage regulating transformer |
| CN113077968B (en) * | 2021-03-25 | 2022-11-22 | 陕西理工大学 | Electric automatic voltage regulating transformer |
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