CN2588521Y

CN2588521Y - Thermal-explosion type breaker

Info

Publication number: CN2588521Y
Application number: CN 02293588
Authority: CN
Inventors: 王保巨; 李秋田
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-12-25
Filing date: 2002-12-25
Publication date: 2003-11-26
Anticipated expiration: 2012-12-25

Abstract

The utility model relates to a thermal explosion type breaker which comprises an upper electrode and a lower electrode which are arranged at the two ends of the utility model. The inner ends of the two electrodes are respectively connected with the two ends of a closed nonmetal casing and are penetrated through the two ends of the closed nonmetal casing. An empty explosion tube is inserted into a hole arranged in the inner end of the upper electrode, and a fast heating resistance chip, a discharging capacitor and a copper spring are orderly arranged from the inner end of the upper electrode to the inner end of the lower electrode. The utility model adopts a thermal explosion principle. When the failure current of a lightning arrester flows through the breaker and reaches a certain value, an electric arc is generated from the inner part of the gap of the discharging capacitor, and meanwhile, the fast heating resistance chip is heated to rapidly detonate the empty explosion tube. The upper electrode is separated from the casing and the lower electrode, which realizes that the lightning arrester is rapidly separated from the earthed point and the separate time is gradually shortened along with the increase of the failure current. Above all things, the structure realizes shunting for industrial frequency failure current and surge current, reduces operation starting current, enhances the capacity of shock resistance current and completely avoids error action. The utility model has the advantages of stable ampere second characteristic, fast reaction speed, good arc extinguishing effect, strong breaking capacity, high reliable work, etc.

Description

The heat explosion type disconnector

Technical field

The utility model relates to a kind of disconnector, the use that is used for connecting with electrical network distribution lightning arrester, and this disconnector hightails when degradation phenomena appears in lightning arrester, makes lightning arrester withdraw from transmission system.

Background technology

The disconnector of domestic use of present stage mainly contains two kinds, a kind of be so-called hot melten type disconnector it cooperate by scolding tin (or fuse) and spring, utilize the resistor disc heating to make the elastic force realization fault lightning arrester of melts soldering tin and spring and the disengaging of circuit.This disconnector has following shortcoming: one, and for realizing breaking away from, its internal structure can not seal fully, under the long-time running condition and in than wet environment, be easy to cause that resistor disc makes moist, spring and other metal parts corrosion, cause disengaging effect complete failure, misoperation very easily appears; They are two years old, when system's two-phase or three-phase lightning protector break down when forming identical short circuit simultaneously, bigger short circuit current appears, need disconnector to move rapidly to realize the disengaging of fault lightning arrester and circuit, the generation of accident in order to avoid accident expansion and circuit breaker trip cause power failure, at this moment the hot melten type disconnector is owing to the defective of self structure principle can not hightail; Another kind is the heat explosion type disconnector, it only is that the simple of external heat explosion type disconnector copied, be that internal structure is a discharging gap parallel coupled electric capacity, special explosive is placed in the discharging gap lower end, realize the disengaging of fault lightning arrester and circuit by the electric arc heat ignition charge that gap discharge produced, because the distribution network systems of external most countries all belongs to low resistance grounding or solidly grounded system, single-phase earth fault current is all more than 20A, therefore, the operating characteristics and the ampere-time characteristic of (more than the 20A) when this type heat explosion type disconnector is only considered to occur than the major break down electric current on principle design, its ampere-time characteristic curve is all from 20A, that is to say when the fault current that flows through lightning arrester reaches 20A, disconnector could move (seeing IEC994 and IEEEC62 pertinent regulations), therefore for China's electric power system and inapplicable.China 66KV and following electrical network, the overwhelming majority is an isolated neutral system and through arc suppression coil earthing system, the system single-phase earth fault electric current is capacity current and generally is no more than 20A, most applications is below the 10A, this just requires the action initial current of the disconnector of domestic electrical network use to match with system's actual features, should be below the 10A, consider zinc oxide arrester simultaneously, under system's continuous operating voltage, as the power current that flows through surpasses tens of MAHs, irreversible deterioration will take place, for the security of operation of system is considered, the action origination action electric current of disconnector also should be from tens of milliamperes, therefore the heat explosion type disconnector of copying external structure fabrication can't reach above-mentioned requirements, even reach, because this structure causes power frequency fault current and impulse current all to act on the special explosive of its lower end by discharging gap, and that both produce the electric arc heat is suitable, even the electric arc heat that impulse current produced in some cases can be more many greatly than the electric arc heat that power frequency fault current produced, the misoperation of disconnector will be often occurred like this, also instructions for use can't be satisfied.

Summary of the invention

The purpose of this utility model just provides a kind of misoperation that do not have, the heat explosion type disconnector that can hightail.

The technical solution of the utility model is: the top electrode and the bottom electrode that comprise two ends, described two electrode the inners connect and penetrate the two ends of the non-metal shell of a sealing respectively, at empty booster of the inner porose insertion of described top electrode, between this top electrode the inner to bottom electrode the inner, place fast thermal resistance sheet, discharging capacitor and copper spring successively.

Described fast thermal resistance sheet is discoid, and one end central authorities have cavity to be enclosed within outside the trigger end of described empty booster; Described discharging capacitor is made of fast thermal resistance sheet, dielectric layer and cap-shaped electrode, and cap-shaped electrode is enclosed within fast thermal resistance sheet lower end and side face, leaves the gap between the two, between the bottom of the lower end of fast thermal resistance sheet and cap-shaped electrode dielectric layer is arranged.

Described housing is made by ABS plastic; The described very Steel Bolt that powers on; Described bottom electrode is a brass bolt; Described copper spring is the elastic copper sheet of zigzag.

The utility model adopts the thermal explosion principle, when the fault current of lightning arrester by disconnector and when reaching certain value, the inner electric arc that produces heats with speed per hour thermal resistance sheet in the gap of discharge capacity, ignite empty booster rapidly, top electrode is separated with housing and bottom electrode, realize hightailing of lightning arrester and earth point, and its separation time shortens gradually along with the increase of fault current, most importantly this structure has realized the shunting of power frequency fault current and impulse current, reduced the action initial current, improve shock-resistant current capacity, avoided misoperation fully.Have that ampere-time characteristic is stable, reaction speed is fast, arc quenching effect good, breaking capacity is strong, the reliable operation advantages of higher.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

Referring to Fig. 1, the utility model comprises the top electrode 1 and the bottom electrode 2 at two ends, their the inner connects and penetrates the two ends of the plastic casing 3 of a sealing respectively, at empty booster 4 of inner porose insertion of described top electrode 1, between the inner to the inner of bottom electrode 2 of this top electrode 1, place fast thermal resistance sheet 5, dielectric layer 6, cap shape electricity level 7 and copper spring 8 successively.Its intermediary layer 6 is formed discharging capacitor with the fast thermal resistance sheet 5 and the cap-shaped electrode 7 of its both sides.

Described fast thermal resistance sheet 5 is discoid, and one end central authorities have cavity to be enclosed within outside the trigger end 41 of described empty booster 4; Cap-shaped electrode 7 is enclosed within fast thermal resistance sheet 5 lower ends and side face, leaves the gap between the two, is dielectric layer 6 between the bottom of the lower end of fast thermal resistance sheet 5 and cap-shaped electrode 7.

Described housing 3 is made by ABS plastic; Described top electrode 1 is a Steel Bolt; Described bottom electrode 2 is a brass bolt.Described copper spring 8 is the zigzag elastic copper sheet.

The utility model adopts the thermal explosion principle, when the fault current of lightning arrester by disconnector and when reaching certain value, the inner electric arc that produces heats fast thermal resistance sheet in the gap of discharge capacity, ignite empty booster rapidly, top electrode is separated with housing and bottom electrode, realize hightailing of lightning arrester and earth point.

Claims

1, a kind of heat explosion type disconnector, the top electrode and the bottom electrode that comprise two ends, it is characterized in that: described two electrode the inners connect and penetrate the two ends of the non-metal shell of a sealing respectively, at empty booster of the inner porose insertion of described top electrode, between this top electrode the inner to bottom electrode the inner, place fast thermal resistance sheet, discharging capacitor and copper spring successively.

2, heat explosion type disconnector according to claim 1 is characterized in that: described fast thermal resistance sheet is discoid, and one end central authorities have cavity to be enclosed within outside the trigger end of described empty booster; Described discharging capacitor is made of fast thermal resistance sheet, dielectric layer and cap-shaped electrode, and cap-shaped electrode is enclosed within fast thermal resistance sheet lower end and side face, leaves the gap between the two, between the bottom of the lower end of fast thermal resistance sheet and cap-shaped electrode dielectric layer is arranged.

3, heat explosion type disconnector according to claim 1 and 2, it is characterized in that: described housing is made by ABS plastic; The described very Steel Bolt that powers on; Described bottom electrode is a brass bolt; Described copper spring is the elastic copper sheet of zigzag.