CN206164087U - Fuse determine module structure in arc extinction device cabinet - Google Patents

Abstract

The utility model discloses a fuse determine module structure in arc extinction device cabinet, the main control unit who sets up in the arc extinction cabinet to and each looks subassembly interior division do not set up from controller, current sensor, photosensitive sensor, ultrasonic sensor, main control unit arranges in the arc extinction cabinet, arrange 3 looks fuses upper end in from the controller, main control unit puts from the controller with each and constitutes the master slaver mode structure. The utility model discloses when system arc light ground connection, turn into metallicity ground connection fast with arc light ground connection, thoroughly eliminated the arc light grounding surge.

Description

A kind of arc-extinction device cabinet Internal fuse detection components structure

Technical field

This utility model is related to the arc-extinction device in electrical network, and in particular to a kind of arc-extinction device cabinet Internal fuse detection components knot Structure.

Background technology

At present, the currently running code regulation of China, the power system to 3 ~ 35kV neutral point indirect earthings connects During earth fault, system allows to continue to run with two hours, and such as Jing higher level relevant department approval can also extend.But code is for " single The concept of phase earth fault " is clearly defined, and such as singlephase earth fault is metallic earthing, and faulted phase voltage is reduced to zero, its Remaining biphase voltage-to-ground will raise to line voltage UL, thus the electrical equipment of this kind of electrical network such as transformator, voltage/current mutual inductance The insulation against ground level of device, chopper and cable etc., can meet the requirement born line voltage effect for a long time and do not damage.But It is that, if singlephase earth fault is arc grounding, its overvoltage is generally 3.15 ~ 3.5 times of phase voltage, in so high mistake Under voltage continuous action, the accumulation that certainly will cause solid insulation is damaged, in the sound weak link for mutually forming insulation, Jin Erfa Open up as phase fault accident.

Traditional view thinks that 3 ~ 35kV electrical networks belong to medium voltage distribution network, and internal overvoltage amplitude is not high in such electrical network, institute With, the principal element for jeopardizing line insulation safety is not internal overvoltage, but atmospheric over-voltage, thus take for a long time Overvoltage protection measure only for preventing atmospheric over-voltage, technical measures to be only limitted to install various types of spark gaps, Its protection value is higher, for internal overvoltage does not have restriction effect.

With the development of electrical network, overhead transmission line is progressively replaced by the cable run of solid insulation.Because solid insulation hits There is the arc grounding mistake produced during single-phase intermittent arc earthing in the build-up effect worn, particularly its internal overvoltage, electrical network Voltage and the ferro-resonance over-voltage for thus exciting, it has also become the one of this kind of electric power netting safe running is big to be threatened.Wherein with single-phase arc Light grounding surge is the most serious.Arc grounding over-voltage can make voltage transformer that saturation occurs, and excite ferromagnetic resonance, cause electricity Pressure transformer heavy overload, causes fuse blows of transformer or transformer to burn.Because arc grounding over-voltage continues Time is long, and energy easily more than the ability to bear of spark gap, causes Explosion of on Arrester.

It is domestic at present mostly arc light to be solved using arc suppression coil compensation or automatic tracking and compensating formula grounding through arc mode Grounding surge problem, its advantage is：

1st, the residual flow of trouble point is reduced, is conducive to the extinguishing of ground arc；

2nd, avoid long-time arcing and cause inter-phase arc short circuit；

3rd, for metallic earthing, system can operate with failure two hours, reduce step voltage poor；

Have the disadvantage：

1st, series resonance over-voltage and Xuhanting oral solution phenomenon are easily produced；

2nd, high voltage side of transformer is exaggerated to the transferring over-voltage of low-pressure side；

3rd, line selection device for low current sensitivity decrease or even cannot route selection is made；

When the 4th, removing to offset capacitance current with inductive current, for high frequency components during arc grounding cannot offset, because And can not effectively limit arc grounding over-voltage；

Foreign countries take the mode of neutral-point solid ground, the country also to have minority area power grid to take Jing low resistance groundings Mode.Although inhibiting arc grounding over-voltage, the reliability to customer power supply is sacrificed.There is single-phase connecing in this system It is artificial without exception to increase earth current no matter whether load is important during ground, circuit breaker trip is made, expand power failure range and time. Due to increasing fault current, when there is arc grounding, burning for trouble point can be aggravated.

Simply simply mechanical contact knocking gear completing, has the disadvantage to melt for fuse failure detection in traditional arc-extinction device Silk fusing moment arc light interference is big, and Jing often has situation about can't detect.

The content of the invention

This utility model is directed to the problems referred to above, there is provided a kind of arc-extinction device cabinet Internal fuse detection components structure, including extinguishing arc Cabinet（10）The master controller of interior setting（11）, and each phase component（20）Inside be respectively provided with from controller（21）, current sense Device（20a）, light sensor（20b）, ultrasonic sensor（20c）；The master controller（11）It is placed in arc extinction cabinet（10）, institute State from controller（21）It is placed in 3 phase fuse upper ends, master controller（11）Composition primary and secondary structure is put with each from controller.

Further, the master controller（11）With remote control terminal（30）It is connected.

Further, the extinguishing arc master controller（11）With fuse detection branches from controller（21）It is respectively equipped with optical fiber Interface, electric pulse interface.

Further, the ultrasonic sensor（20c）Circuit be made up of integrated operational amplifier chip OP37 Two-stage amplifying circuit, the second order bandwidth-limited circuit being made up of integrated operational amplifier chip TL082 is constituted, the second order band logical Filter circuit, is filtered to the signal after amplification, is then transmit to AD samplings.

Advantage of the present utility model：

This utility model to taking comprehensive descision mode on the judgment mode of fuse failure, when fuse failure moment arclight During generation, faulted phase current reaches more than several times under normal circumstances, and air ionization produces dazzling arc light and ear-piercing ultrasound wave. Controller more than 3 conditions as basis for estimation, sensor acquisition to data deliver to central processor comprehensive analysis and sentence Having no progeny corresponding action of carry out again.Master controller not only passes through optical fiber and each from control communication among unit, and using standard industry 485 Interface can communicate with remote computer terminal, realize remotely control.This utility model is that a whole set of arc extinction cabinet fuse failure is protected Shield scheme, it is not only novel effectively to the judgment mode of arc extinction cabinet Internal fuse fusing, and system run all right reliability, can extensively answer In for mesolow power system, in time the accident of detection fuse failure, protects power grid security normally to run.

Arc grounding is rapidly converted into metallic earthing by this utility model when system occurs arc grounding, is thoroughly disappeared Except arc grounding over-voltage.

In addition to objects, features and advantages described above, this utility model also has other purposes, feature and excellent Point.Below with reference to figure, this utility model is described in further detail.

Description of the drawings

The accompanying drawing for constituting the part of the application is used for providing further understanding to of the present utility model, of the present utility model Schematic description and description is used to explain this utility model, does not constitute to improper restriction of the present utility model.

Fig. 1 is the structural representation of this utility model embodiment；

Fig. 2 is the circuit theory diagrams of the ultrasonic sensor of this utility model embodiment；

Fig. 3 is the switch board inner structure schematic diagram of this utility model embodiment.

Reference：

10 be arc extinction cabinet, 11 be master controller, 20 be each phase component, 21 be from controller, 20a be current sensor, 20b For light sensor, 20c be ultrasonic sensor, 30 be remote control terminal, 16 be wall bushing, 17 be isolation switch, 18 For fuse detection components, 19 be high-voltage and current-limitation fuse, 20 be high-tension fuse, 21 be overvoltage protection device, 22 once to disappear Humorous device, 23 be voltage transformer, 24 be high-pressure vacuum contactor.

Specific embodiment

In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain this Utility model, is not used to limit this utility model.

With reference to Fig. 1 and Fig. 2, a kind of arc-extinction device cabinet Internal fuse detection components structure as depicted in figs. 1 and 2, including disappearing Arc cabinet（10）The master controller of interior setting（11）, and each phase component（20）Inside be respectively provided with from controller（21）, electric current pass Sensor（20a）, light sensor（20b）, ultrasonic sensor（20c）；；The master controller（11）It is placed in arc extinction cabinet （10）, it is described from controller（21）It is placed in 3 phase fuse upper ends, master controller（11）Composition master-slave mode knot is put with each from controller Structure.

From controller（21）Receive current sensor（20a）, light sensor（20b）, ultrasonic sensor（20c）Input Signal be analyzed the running status for judging fuse failure, master controller（11）, from controller（21）Between carry out data friendship Mutually transmission.

The master controller（11）With remote control terminal（30）It is connected.

The extinguishing arc master controller（11）With fuse detection branches from controller（21）It is respectively equipped with optical fiber interface, electric pulse Interface.

The ultrasonic sensor（20c）The two-stage that is made up of integrated operational amplifier chip OP37 of circuit amplify electricity Road, the second order bandwidth-limited circuit being made up of integrated operational amplifier chip TL082 is constituted, the second order bandwidth-limited circuit, Signal after amplification is filtered, AD samplings are then transmit to.

Master controller and multiple-limb are from adopting single mode fiber communications between controller；The master controller possesses 485 communications Serial ports, communicates with remote computer terminal；

The light sensor OT adopts the light sensor of model PN11528.

Master controller（11）With each from controller（21）Constitute primary and secondary structure, master and slave controller（21）Between adopt Fiber optic communication；Master controller（11）If 485 communication serial ports and remote control terminal（30）Communication, realizes remote monitoring.Master and slave control Device processed（21）Optical fiber interface, electric pulse interface are respectively equipped with, from controller 3 phase fuses are placed in（19）Upper end（18）Place.

Fig. 2 be ultrasonic sensor ST circuit theory diagrams, on figure institute's identifier Y1 be piezoelectric ceramics, circuit mainly by The two-stage amplifying circuit that OP37 is constituted, the second order bandwidth-limited circuit being made up of TL082.Because of the ultrasonic frequency that arclight is produced Height, incoming signal is weaker, is millivolt level, therefore designs two-stage amplification, and about 5000 times are amplified altogether.In view of in complicated work In making environment, in order to the sound wave for preventing different frequency is disturbed, the high accuracy bandwidth-limited circuit being made up of TL082 is devised, it is right Signal after amplification is filtered, and is then transmit to AD samplings.

Controller output signal Jing fiber optic emitters can access light-operated switch by optical signal transmission fiber, light-operated controllable Silicon etc..

This utility model to taking comprehensive descision mode on the judgment mode of fuse failure, when fuse failure moment arclight During generation, faulted phase current reaches more than several times under normal circumstances, and air ionization produces dazzling arc light and ear-piercing ultrasound wave. Controller more than 3 conditions as basis for estimation, sensor acquisition to data deliver to central processor comprehensive analysis and sentence Having no progeny corresponding action of carry out again.Master controller not only passes through optical fiber and each from control communication among unit, and using standard industry 485 Interface can communicate with remote computer terminal, realize remotely control.This utility model is that a whole set of arc extinction cabinet fuse failure is protected Shield scheme, it is not only novel effectively to the judgment mode of arc extinction cabinet Internal fuse fusing, and system run all right reliability, can extensively answer In for mesolow power system, in time the accident of detection fuse failure, protects power grid security normally to run.

Arc grounding is rapidly converted into metallic earthing by this utility model when system occurs arc grounding, is thoroughly disappeared Except arc grounding over-voltage.

Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit this utility model Within new spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in guarantor of the present utility model Within the scope of shield.

Claims (4)

1. a kind of arc-extinction device cabinet Internal fuse detection components structure, it is characterised in that including arc extinction cabinet（10）The master control of interior setting Device processed（11）, and each phase component（20）Inside be respectively provided with from controller（21）, current sensor（20a）, light sensor （20b）, ultrasonic sensor（20c）；The master controller（11）It is placed in arc extinction cabinet（10）It is interior, it is described from controller（21）It is placed in 3 phase fuse upper ends, master controller（11）Composition primary and secondary structure is put with each from controller.

2. arc-extinction device cabinet Internal fuse detection components structure according to claim 1, it is characterised in that the master controller （11）With remote control terminal（30）It is connected.

3. arc-extinction device cabinet Internal fuse detection components structure according to claim 1, it is characterised in that the extinguishing arc master control Device processed（11）With fuse detection branches from controller（21）It is respectively equipped with optical fiber interface, electric pulse interface.

4. arc-extinction device cabinet Internal fuse detection components structure according to claim 1, it is characterised in that the ultrasound wave is passed Sensor（20c）The two-stage amplifying circuit that is made up of integrated operational amplifier chip OP37 of circuit, by integrated operational amplifier core The second order bandwidth-limited circuit that piece TL082 is constituted is constituted, and the second order bandwidth-limited circuit is filtered to the signal after amplification Ripple, is then transmit to AD samplings.