CN100447926C

CN100447926C - Quick-acting oil pressure relay for trans former

Info

Publication number: CN100447926C
Application number: CNB2006101346341A
Authority: CN
Inventors: 王世有
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-08
Filing date: 2006-12-08
Publication date: 2008-12-31
Anticipated expiration: 2026-12-08
Also published as: CN101004986A

Abstract

The oil-pressure relay includes a body case. An oil-feeding hole is on underside of the body case; an air inlet, and an air outlet valve are on up side of the body case; a big corrugated pipe (BCP) inside the body case is positioned above the oil-feeding hole. A compression spring is built inside BCP. BCP is connected to a micro force corrugated pipe (MFCP), which is connected to mechanical contact type switch. Being formed between BCP and MFCP, a sealed oil cavity is separated from an air chamber inside the body case. When gas pressure inside the air chamber is increased, the pressed and shrunken BCP pulls MFCP so that the mechanical contact type switch connected to MFCP is turned to close; therefore alarming signal is output. The invention provides good sealability so as to prevent each problem caused by poor tightness of wind blown seal ring. Not influenced by magnetic field around transformer, the mechanical contact type switch possesses high reliability.

Description

Quick-acting oil pressure relay for trans former

Technical field:

The present invention relates to the tank pressure relay in the oil-filled equipments such as a kind of transformer, power capacitor and reactor, especially a kind of good seal performance, the quick-acting oil pressure relay for trans former that the warning reliability is high.

Background technology:

Be provided with fuel tank in the oil-filled power equipments such as transformer, power capacitor and reactor, insulating oil in the fuel tank and organic insulating material can be aging gradually under the effect of heat and electricity, to produce multiple gases such as a spot of low molecular hydrocarbons class, carbon dioxide and carbon monoxide, the major part of the following gas that produces of normal condition can be dissolved in the oil.But, when having fault such as the overheated and discharge of latency when power equipment, gas produces speed will be accelerated, the a large amount of gases that produced will make in the oil gas saturated and fill in fuel tank, when gas pressure reaches certain value in the fuel tank, need fix a breakdown on the one hand, the gas that also needs in time to discharge in the fuel tank on the other hand and produced, avoid the excessive and blast that causes of gas pressure in the fuel tank, for this reason, at present and fuel tank all be connected to the gas pressure relay basically.Existing gas pressure relay all has housing, be provided with in the bottom surface of housing and be used for the oil filler point that joins with fuel tank, the air inlet and the vent valve that link to each other with fuel tank are arranged above the housing, single spring and common rubber sealing are adopted in oil filler point and fuel tank junction, in housing, be provided with and be subjected to the pressure controlled electromagnetic force switch of gas, when the housing internal pressure reaches setting, electromagnetic force switch motion, output alarm signal.Exist following shortcoming:

1. when using the cushion rubber weathering as sealing, just lost sealing between oil filler point and the fuel tank, caused a large amount of transformer oil to leak outside, air enters in the transformer then, influences the normal use of transformer;

2. electromagnetic force switch Chang Yin is disturbed by the transformer surrounding magnetic field and causes false alarm.

Summary of the invention:

The present invention is technical problems such as existing in prior technology sealing is bad, false alarm in order to solve, and a kind of good seal performance, quick-acting oil pressure relay for trans former that the warning reliability is high are provided.

Technical solution of the present invention is: a kind of quick-acting oil pressure relay for trans former, be provided with housing, there is oil filler point the bottom surface of housing, air inlet and vent valve are arranged above the housing, in housing, be provided with the big bellows that places above the oil filler point, big bellows is built-in with the compression spring, is connected to little power bellows on the big bellows, and little power bellows and mechanical contacts formula switch join.

Described mechanical contacts formula switch is provided with the electrostatic isolation housing, static housing internal fixation has fixed juncture, above fixed juncture, be provided with movable contact, the shell fragment that the movable contact and the other end are fixed on the electrostatic isolation housing joins, be connected to pillar above the shell fragment, be connected on the pillar by hinge and be fixed on flap on the electrostatic isolation housing, the other end of flap is connected to the contact.

The present invention be according in the fuel tank because the dynamic pressure that causes of accident increases moves, the oil pressure growth rate is fast more, move rapidly more, so the present invention has and is quick on the draw, moves accurate, can send advantages such as alarm signal rapidly.It is applied on the transformer, can prevents to cause serious accidents such as fuel tank distortion, explosion because of the inside fault that is short-circuited as oil tank of transformer.The present invention has good seal performance simultaneously, can avoid the variety of issue that causes owing to sealing ring weathering, sealing difference in the prior art, and mechanical contacts formula switch can prevent the false alarm that causes because of the influence of transformer surrounding magnetic field, reliability height simultaneously.

Description of drawings:

Fig. 1 is the structural representation of the embodiment of the invention.

Fig. 2 is the structural representation of mechanical contacts formula switch in the embodiment of the invention.

Embodiment:

Below in conjunction with description of drawings the specific embodiment of the present invention.As shown in Figure 1: a kind of quick-acting oil pressure relay for trans former, be provided with housing 1, the bottom surface of housing 1 is to be used for the ring flange that joins with fuel tank, oil filler point 2 is arranged in the ring flange, the air inlet 3 and the vent valve 4 that communicate with gas in the fuel tank are arranged above the housing 1, in housing 1, be connected to big bellows 5 above the oil filler point 2, the center is equipped with compression spring 6 in the big bellows 4, be connected to the little power bellows 7 concentric on the big bellows 5 with bellows greatly 5, little power bellows 7 joins with mechanical contacts formula switch 8, mechanical contacts formula switch 8 can be multiple structure, but should be when little power bellows 7 moves down, and sends alarm signal.

Described mechanical contacts formula switch 6 can be as shown in Figure 2: electrostatic isolation housing 9 is arranged, and static housing 9 internal fixation have fixed juncture 10, are provided with movable contact 11 above fixed juncture 10, and movable contact 11 tops are provided with spacing point 17.Movable contact 11 joins with the shell fragment 12 that the other end is fixed on the electrostatic isolation housing 9, is connected to pillar 13 above the shell fragment 12, is connected on the pillar 13 by hinge 14 and is fixed on flap 15 on the electrostatic isolation housing 9, and the other end of flap 15 is connected to contact 16.During installation, electrostatic isolation housing 9 is fixed on the housing 1, contact 16 is joining with little power bellows 7 down.

The course of work:

The fuel tank of power equipments such as the embodiment of the invention and transformer is joined, and the oil in the fuel tank injects big bellows by oil filler point 2 and little Reeb line pipe forms the grease chamber that seals, and the gas in the fuel tank enters in the air chamber of being separated by with the grease chamber by air admission hole 3.During power equipment operate as normal (fault-free), the gas in the fuel tank is less, separates bellows in the grease chamber and is subjected to less quiet oil pressure, and the spring in the grease chamber compensates this quiet oil pressure and reaches balance, and the quick-action oil pressure relay is failure to actuate.Little power bellows 7 makes movable contact 11 and fixed juncture 10 be in off-state by contact 16, pillar 13, shell fragment 12, does not have alarm signal output; When power equipment breaks down,, make the gas pressure in the air chamber become big because gas increases, big bellows pressurized shrinks, spur little power bellows and make the contact 16 that joins with little power bellows, make movable contact 11 and fixed juncture 10 join output alarm signal by pillar 13, shell fragment 12.At this moment, can open vent valve 4 electrical equipment fault is eliminated in the gas discharge simultaneously.

Claims

1. quick-acting oil pressure relay for trans former, be provided with housing (1), there is oil filler point (2) bottom surface of housing (1), air inlet (3) and vent valve (4) are arranged above the housing (1), in housing (1), be provided with the big bellows (5) that places oil filler point (2) top, big bellows (4) is built-in with compression spring (6), be connected to little power bellows (7) on the big bellows (5), little power bellows (7) joins with mechanical contacts formula switch (8), it is characterized in that: described mechanical contacts formula switch (8) is provided with electrostatic isolation housing (9), static housing (9) internal fixation has fixed juncture (10), be provided with movable contact (11) in fixed juncture (10) top, movable contact (11) joins with the shell fragment (12) that the other end is fixed on the electrostatic isolation housing (9), be connected to pillar (13) above the shell fragment (12), be connected on the pillar (13) by hinge (14) and be fixed on flap (15) on the electrostatic isolation housing (9), the other end of flap (15) is connected to contact (16).