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75MVA transformer with mixed explosion-proof function

A technology of transformers and mixers, applied in transformer/inductor housing, transformer/inductor cooling, instruments, etc., to prevent secondary accidents, improve explosion-proof performance, and simple design

Inactive Publication Date: 2015-12-23
夏烬楚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to: aim at the above existing problems, to provide a hybrid explosion-proof 75MVA transformer, using a mixed fire extinguishing gas, which can avoid unnecessary losses caused by a single fire extinguishing gas due to its own defects, and ensure the safety of power supply to the greatest extent

Method used

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  • 75MVA transformer with mixed explosion-proof function

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Comparison scheme
Effect test

specific Embodiment 1

[0047] A hybrid explosion-proof 75MVA transformer of the present invention includes a fire extinguishing mechanism 3 connected to the transformer 1, a pressure release mechanism 4, a leak detection mechanism and a control mechanism;

[0048] Transformer 1, including shell, oil conservator 2, iron core, winding; oil conservator 2 is arranged on the upper end of the shell, and is connected with the shell through a pipeline, and the pipeline is provided with a gas relay and a shut-off valve; three-phase winding It is installed in the housing, and the winding is wrapped with an iron core. A temperature sensor is installed at the upper, middle and lower positions of the three-phase winding; a pressure sensor is respectively installed at the upper, middle and lower parts of the housing;

[0049] The fire extinguishing mechanism 3 includes a fire extinguishing box, a fire extinguishing tank, and a gas booster pump; the fire extinguishing tank is arranged in the fire extinguishing box,...

specific Embodiment 2

[0062] Transformer 1 unit, including shell, oil conservator 2, iron core, winding; oil conservator 2 is fixed on the top of the shell and connected to the shell through the gas relay and shut-off valve; the three-phase winding is set in the shell, each winding Wrapped with an iron core, a temperature sensor is installed at the upper, middle and lower positions of each winding; a pressure sensor is respectively installed at the upper, middle and lower parts of the casing to detect the oil temperature or gas temperature in the casing; the transformer There is a basement under 1;

[0063] The pressure release unit includes an oil discharge tank, an oil discharge pool, an oil discharge pump, an igniter, and a pressure release valve; the oil discharge tank is located in the basement below the transformer 1, and there is a solenoid valve on the middle and lower outside of the transformer 1 housing, The two solenoid valves are connected in parallel to the oil discharge tank; an oil d...

specific Embodiment 3

[0073] (3) Open the solenoid valve at the outlet of the mixer, so that the air pressure in the pipeline connecting the mixer and transformer 1 rises to 15-18kpa, then close the solenoid valve, and the air pressure in the mixer drops to 30-35kpa;

[0074] (4) The control unit opens or closes the helium tank, the heptafluoropropane tank, and the nitrogen tank in turn until the pressure in the mixer reaches 80kpa, and makes the content ratio in the mixer helium: heptafluoropropane: nitrogen = (8.5-9.4): (4.6 -5.3): (11.3-15.2); then continue to open or close the helium tank, heptafluoropropane tank, and nitrogen tank in sequence according to the ratio until the pressure in the mixer is 100±10%kpa;

[0075] (5) When the pressure in the helium tank, nitrogen tank, and heptafluoropropane drops to 15%-20% of its initial pressure, it should be replenished in time.

[0076] Due to the above method, the use of a mixed fire extinguishing gas can avoid unnecessary losses caused by a singl...

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Abstract

The invention discloses a 75MVA transformer with a mixed explosion-proof function. The 75MVA transformer comprises a fire extinguishment mechanism, a pressure release mechanism, a leakage detecting mechanism and a control mechanism which are connected onto the transformer, wherein a system of the 75MVA transformer comprises a control unit as well as a purification unit, a leakage detecting unit, a fire extinguishment unit, a pressure release unit and a transformer unit which are subjected to unified regulation by the control unit. The 75MVA transformer has the benefits as follows: the transformer explosion can be effectively prevented, personal and property safety is protected, and the structure can monitor each part on a winding and can perform early warning and complete explosion-proof actions in time when a short circuit happens. The short-circuit part can be focused to cool, meanwhile, fire-extinguishing gas is uniformly sprayed at the top of the transformer, the explosion-proof means is enhanced, pressure of the transformer can be released in time, and transformer oil waste can be avoided. Each sensor is made of a special material and has higher sensitivity, and false operation or false alarm of the device can be effectively prevented.

Description

technical field [0001] The invention relates to a hybrid explosion-proof 75MVA transformer. Background technique [0002] With the development of science and technology, the voltage level of transformers is getting higher and higher, and the capacity is getting bigger and bigger. A little carelessness can easily lead to major accidents. The safety and reliability of power supply is even more important. Known as active explosion-proof, fire-proof and fire-extinguishing equipment, it is the loyal guard of oil-immersed transformers. It will be more widely used in substations and power stations, and will make greater contributions to the safe production of power plants and substations across the country. The 75MVA oil-immersed transformer is one of the main application power equipment in power plants and substations. The long-term overload operation of the transformer and the cracking and corrosion of the insulating oil will cause the aging and deterioration of the winding insu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/40H01F27/02A62C3/16G05F1/14H01F27/14B03C1/30
Inventor 夏烬楚
Owner 夏烬楚
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