CN201323162Y

CN201323162Y - Gas-actuated relay

Info

Publication number: CN201323162Y
Application number: CNU2008202319346U
Authority: CN
Inventors: 孙延宏; 杨景魁; 肖斌
Original assignee: SHENYANG TRANSFORMER INSTITUTE ELECTRICAL TECHNOLOGY Co Ltd
Current assignee: SHENYANG TRANSFORMER INSTITUTE ELECTRICAL TECHNOLOGY Co Ltd
Priority date: 2008-12-23
Filing date: 2008-12-23
Publication date: 2009-10-07
Anticipated expiration: 2018-12-23

Abstract

The utility model provides a gas-actuated relay, aiming at solving the problems that the existing relay can not detect and warn the phenomena of sharp increasing pressure and surging oil stream caused by internal fault of a transformer; the volume of an oil cavity is too small, and oil level fluctuates frequently, thus leading a warning device to act frequently to cause the whole reliability to be low; finally, the heavy gas warning function of the existing relay is not scientific and accurate. The utility model has the key points that the oil cavity is provided with a clapboard used for dividing the oil cavity into an upper cavity and a lower cavity, each of which is provided with a magnetic floater and a lead rail thereof as well as a magnetic reed switch installed inside the lead rail, wherein, the magnetic floater and the lead rail thereof as well as the magnetic reed which are arranged in the upper oil cavity are covered inside a gas collecting box, the gap formed between the gas collecting box and the oil cavity takes the standard that the oil can form surface tension in the gas as the limitation, the upper part of the gas collecting box is provided with a corrugated pipe, and the input end of a pressure switch is arranged inside an inner cavity of the corrugated pipe. The utility model has the characteristics of high reliability and complete functions.

Description

A kind of Buchholz relay

Technical field

The utility model belongs to the parts or the assembly of oil-immersed type transformer; it is installed on the fuel tank case lid of transformer; when tank pressure raises and produce gas, can send the operation of early warning signal excision transformer, be a kind of device that the safe operation to transformer shields.

Background technology

At present, providing the device of protection to the gas that produces in the oil-overflow hermetically sealed distribution transformer fuel tank is a kind of Buchholz relay.This relay mainly by the housing that has inspection hole, be contained in the vent valve, the liquid level display window that cover, magnetic float and guide rail thereof in the oil pocket, be installed in the formations such as magnetic reed switch on the guide rail.Because physical factors such as the inner Yin Wendu of oil tank of transformer, pressure enter in the relay oil pocket gas that produces in the fuel tank, when reaching the quantitative values of relay, can cause the variation of oil level in the oil pocket, the magnetic float is moved up and down, alarm signal is sent in the action of triggering magnetic reed switch.But to the phenomenon that springs up of rapid rising of the pressure of power transformer interior fault generation and oil stream, this relay can not detect and report to the police, thereby can not play the function of protection to the safe operation of transformer comprehensively; Secondly, the volume of oil pocket is too little, and the oil level fluctuation is frequent, thereby makes the warning device frequent movement, causes global reliability low; At last, its heavy gas alarming is an output alarm signal when detecting gas flow in the oil pocket and reach the minimum pasta of setting or the force value in the relay cavity and reach set point, and such setting neither science is also inaccurate, and reliability is relatively poor.

Summary of the invention

For overcoming the deficiency of prior art, the purpose of this utility model is to provide a kind of reliability height, multiple functional Buchholz relay.

The purpose of this utility model is achieved in that it is by the housing that has magnet rotor liquid level indication mechanism, it is characterized in that: have a dividing plate that oil pocket is divided into two chambeies up and down in the oil pocket, magnetic float and guide rail thereof are all arranged in each chamber, be installed in the magnetic reed switch in the guide rail, wherein magnetic float in upper oil cavitie and guide rail thereof, magnetic reed switch are housed in the collector box, the slit that forms between collector box and the oil pocket can form surface tension at this seam with oil and exceed, top at collector box is provided with bellows, and the input of pressure switch is in the bellows inner chamber.

The function that realizes is:

1) liquid level shows, the magnet rotor liquid level indication mechanism of being responded under the variation of liquid level outside the Buchholz relay housing by the following magnetic float in the lower oil cavitie rotates, and shows liquid level by different colours.

2) light gas alarming: when collector box inner accumulated gas, the liquid level in this collector box descends, and last magnetic float moves down, and alarm signal is sent in last magnetic reed switch action.

3) heavy gas alarming: make when breaking down in the oil tank of transformer that pressure rises rapidly, pressure changes when increasing, cause the bellows compressive deformation in this Buchholz relay, it is big that pressure in the bellows becomes, the action of triggering pressure switch, the signal of a switching value of output is used for the warning or the tripping operation of transformer control.

Compared with prior art, the beneficial effects of the utility model are:

1, owing to utilized the surface tension of liquid, makes the oil level in the collector box not follow the variation of oil level in the oil pocket, thereby solved the difficult problem of the light gas alarming of the frequent output of relay, reliability of the present utility model is significantly improved;

2, the variation that the utility model adopts the pressure climbing speed on heavy gas alarming is as the detection alarm signal, reaches setting as the detection alarm signal of heavy gas science, more accurate more than original employing with force value.

Description of drawings

Further specify the utility model below in conjunction with accompanying drawing.

Accompanying drawing is a schematic diagram of the present utility model.

Embodiment

It is by the housing 1 that has magnet rotor liquid level indication mechanism 11, there is a dividing plate 12 that oil pocket is divided into upper oil cavitie 13 and lower oil cavitie 14 in the oil pocket, last magnetic float 2 and guide rail 15 thereof are arranged in the upper oil cavitie, be installed in the interior magnetic reed switch 6 on the guide rail, following magnetic float 3 and guide rail 15 thereof are arranged in the lower oil cavitie, be installed in the following magnetic reed switch 7 in the guide rail, last magnetic float and guide rail thereof, magnetic reed switch is housed in the collector box 4, the slit that forms between collector box and the oil pocket can form surface tension at this seam with oil and exceed, on the top of collector box bellows 5 is set, the input of pressure switch 8 is in the bellows inner chamber.

When power transformer interior fault produces gas, oil level entering and reduce in the cavity of this Buchholz relay with gas, its liquid level shows that the magnet rotor 11 on the induction housing 1 of moving up and down by the following magnetic float 3 of this relay rotates and shows liquid level by different colours, when the liquid level in the oil tank of transformer is lower than the minimum liquid level of defined, then descend a switching value signal caution of magnetic float induction magnetic reed switch 7 outputs oil level to reach minimum point.

And when the gas in the collector box reached set point 250ml, then the 2 induction magnetic reed switchs 6 of the last magnetic float in the collector box were exported a light gas alarming signal.

When making the pressure in the grease chamber, the fault in the oil tank of transformer rises suddenly, when climbing speed meets or exceeds 25kPa/s, the bellows compressive deformation makes that the volume of its inner chamber reduces, pressure raises, this pressure imports connected pressure switch 8 into, when its pressure rising value reaches the operating value of this pressure switch, the heavy gas alarming signal of pressure switch 8 action outputs.

In addition, top of chamber has a balancing hole 9 in bellows.When the transformer internal pressure slowly increased owing to non-fault reason but is lower than certain value, the pressure of bellows inner chamber increases by balancing hole along with the displacement of bellows 5 is slow made bellows inner chamber and air-pressure chamber 10 pressure keep balance, and pressure switch 8 is failure to actuate.

Claims

1, a kind of Buchholz relay, it has the housing and the magnet rotor liquid level indication mechanism of band inspection hole, it is characterized in that: have a dividing plate that oil pocket is divided into two chambeies up and down in the oil pocket, magnetic float and guide rail thereof are all arranged in each chamber, be installed in the magnetic reed switch in the guide rail, wherein magnetic float in upper oil cavitie and guide rail thereof, magnetic reed switch are housed in the collector box, the slit that forms between collector box and the oil pocket can form surface tension at this seam with oil and exceed, top at collector box is provided with bellows, and the input of pressure switch is in the bellows inner chamber.

2, according to the described Buchholz relay of claim 1, it is characterized in that: top of chamber has a balancing hole in bellows.