CN2336500Y

CN2336500Y - Insulation four-branch combined overvoltage protector

Info

Publication number: CN2336500Y
Application number: CN 98226097
Authority: CN
Inventors: 杜志庭; 吴信玲
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-03
Filing date: 1998-03-03
Publication date: 1999-09-01
Anticipated expiration: 2008-03-03

Abstract

The utility model relates to an insulation four-branch combined overvoltage protector. The installation midpoint is connected with four protection branches provided with nonlinear resistors and arranged in series connection with discharge gaps to form a radiation shape. The other ends of the four protection branches are respectively connected with each phase wire and earth wire of protected equipment. The utility model is characterized in that each discharge gap is respectively connected in parallel with a resistor; the protection branch adopts an explosion-proof epoxy sleeve, and uses a composite insulation body as a sealed outer casing; a gap is kept between the explosion-proof epoxy sleeve and a zinc-oxide nonlinear resistor. The utility model not only has stable overvoltage operating value, but also has explosion-proof performance.

Description

Composite insulation four branch combinations formula overvoltage protectors

The utility model relates to over-pressure safety device.More particularly, be a kind of over-pressure safety device that is used for high-voltage electrical equipment.

Because the high voltage electric equipment, as transformer, switch and motor etc., not only insulation relatively has certain limit, and a little less than phase insulation also is highly brittle.Equate in order to make alternate protection overvoltage multiple cross electric multiple with protection relatively; avoid atmospheric over-voltage and switching overvoltage to cause the puncture of phase insulation and damage equipment; in the prior art; the simple Modular Three-Phase Overvoltage Protector of general employing; this protector becomes to penetrate shape and connects and respectively protect branch road from mid point O is set; the other end of protection branch road connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively, and each bar protection branch road of this protector only is made of discharging gap and the znr institute that is connected in series.But, in actual the use because under power-frequency voltage and surge voltage effect, electric current is very little before the discharge, again since the capacitance of discharging gap much smaller than the capacitance of znr; Therefore, voltage mainly is distributed on the discharging gap according to each discharging gap capacitance relative size between alternate or phase ground, and surrounding environment, all can greatly change the relative size of discharging gap capacitance such as the earth or aerial condutor, thereby the voltage in the change loop distributes, and then changes the size of overvoltage operating value.As seen, though this protection has solved the problem of equipment phase insulation to a certain extent, as easy as rolling off a log generation malfunction or tripping cause bigger harm for whole using electricity system owing to protect the instability of overvoltage operating value.In addition; protector of the prior art mainly adopts porcelain system overcoat; in actual the use; because the energy capacity of overvoltage protector has certain limit; and the overvoltage energy that system occurs for various reasons might surpass this limit; or owing to overvoltage protector existence control in sealing manufacturing process does not sternly enter quality problems such as moisture, these situations all may make overvoltage protector owing to interior puncture is exploded.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art; a kind of stable overvoltage operating value that not only has is provided; and the composite insulation four branch combinations formula overvoltage protectors with explosion-proof performance, to guarantee the fail safe of power consumption equipment and power utilization environment.

The purpose of this utility model is achieved through the following technical solutions:

The utility model becomes to penetrate four protection branch roads that are connected in series by nonlinear resistance and discharging gap of shape connection from mid point is set, and the other end of described four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively.

Design feature of the present utility model is:

A, on described discharging gap g1, g2, g3 and the g4 that respectively protects in the branch road, be parallel with resistance R 1, R2, R3 and R4 respectively;

B, described four protection branch roads adopt explosion-proof epoxy cylinder, and with composite insulation as hermetically sealed case.

C, described explosion-proof epoxy sleeve and znr leave the gap each other.

The utility model needs the discharging gap of tandem compound discharge to install parallel resistance additional by giving, and makes voltage in the loop by the resistance value size distribution, eliminates the influence that stray capacitance distributes to voltage.Thereby make protection overvoltage operating value tend towards stability.Hermetically-sealed construction setting of the present utility model, and the employing of explosion-proof type epoxy cylinder and composite insulation overcoat can be avoided the generation of explosion accident effectively.

Compared with the prior art, the utlity model has following advantage:

1, the utility model is effectively eliminated stray capacitance to the influence that loop voltage distributes, and can choose and protect the overvoltage operating value accurately, and its dispersiveness on average can be controlled at below 1%; Therefore; needs according to system and protected equipment; can accurately design protection overvoltage operating value of the present utility model, avoiding temporary overvoltage and the lower switching overvoltage of part peak value that equipment can bear, and only under the higher switching overvoltage of atmospheric over-voltage and peak value, move.Eliminate malfunction and tripping phenomenon.Both protected equipment, self-operating safety is protected.

2, because employing through the epoxy sleeve of explosion-proof processing, reaches the rubber-like tartan as overcoat, make to the utlity model has superior explosion-proof performance, and in light weight, and volume is little, and is easy for installation.

3, synthetic insulating material overcoat of the present utility model improves overvoltage protector external insulation and anti-fouling flashover performance greatly, and uvioresistant and ageing resistace are also very outstanding.

Fig. 1 is the utility model structural representation.

By the following examples, in conjunction with the accompanying drawings the utility model is further described.

Embodiment:

Referring to accompanying drawing; become to penetrate four protection branch roads that are made of nonlinear resistance FR1, FR2, FR3, FR4 and discharging gap g1, g2, g3, g4 series connection of shape connection from mid point O is set, the other end of described four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively.In the present embodiment, on described discharging gap g1, g2, g3 and the g4 that respectively protects in the branch road, be parallel with resistance R 1, R2, R3 and R4 respectively.This parallel resistance can be a linear resistance, also can be nonlinear resistance.

Article four, the explosion-proof epoxy sleeve 1 of protection branch road overcoat, and with composite insulation as hermetically sealed case 2.As shown in the figure, discharging gap 4, znr 5 and the bottom electrode 6 of top electrode 3, band parallel resistance fixedly install by epoxy sleeve 1, and outside through the solid cover of insulation hermetically sealed case 2 sealings, two ends are by upper end cover 7 and bottom end cover 8 glands.Wiring screw rod is fixedly installed on the central authorities of upper and lower electrode.As shown in the figure, explosion-proof epoxy sleeve 1 should leave the gap each other with znr 5.

In the present embodiment, the composite insulation that is used as hermetically sealed case is silicon rubber insulation body or ethylene propylene diene rubber insulator.

Claims

1, composite insulation four branch combinations formula overvoltage protectors; from being set, mid point O becomes to penetrate four protection branch roads that are connected in series by nonlinear resistance FR1, FR2, FR3, FR4 and discharging gap g1, g2, g3, g4 of shape connection; the other end of described four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively, it is characterized in that:

B, described four protection branch roads adopt explosion-proof epoxy sleeve 1, and with composite insulation as hermetically sealed case 2;

C, described explosion-proof epoxy sleeve 1 leave the gap each other with znr 5.

2, composite insulation four branch combinations formula overvoltage protectors according to claim 1, the sealing composite insulation that it is characterized in that described four protection branch roads is silicon rubber insulation body or ethylene propylene diene rubber insulator.