CN201877345U

CN201877345U - Arc extinguisher

Info

Publication number: CN201877345U
Application number: CN2010206207402U
Authority: CN
Inventors: 方彧
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-11-24
Filing date: 2010-11-24
Publication date: 2011-06-22
Anticipated expiration: 2020-11-24

Abstract

The utility model relates to an arc extinguisher, which comprises a housing, vacuum circuit breakers are arranged in the closed space defined by the housing, one end of each vacuum circuit breaker is connected with a three-phase main bus through a disconnector K, and the other end of each vacuum circuit breaker is grounded through a grounding copper bar. The utility model adopts the vacuum circuit breakers controlled at different phases to replace the high-voltage current-limiting fuses and the vacuum contactors in the fuse type arc extinguisher, so that various interphase short-circuit currents can be cut off within a range less than the rated short-circuit-breaking current, the reliability is high, and meanwhile, the arc extinguisher can be repetitively used, and is convenient to maintain.

Description

Arc-extinction device

Technical field

The utility model relates to a kind of arc-extinction device.

Background technology

The arc-extinction device of using in the system is the fuse wire type arc-extinction device at present, its principle be with the fault of the vacuum contactor of high-voltage and current-limitation fuse series connection ground connection mutually, extinguishing ground arc and to eliminate the arc grounding overvoltage, thereby avoid becoming the phase fault accident by single-phase arc grounding fault progression.Though vacuum contactor has satisfied the requirement of arc-extinction device frequent operation, but can not cut-off short circuit current, when the fuse wire type arc-extinction device is in operate condition, when another phase ground connection is taken place again under the situation that fault phase vacuum contactor has closed a floodgate, can only cut-off the line to line fault electric current by high-voltage and current-limitation fuse, this just has the following disadvantages inevitably: at first, high-voltage and current-limitation fuse belongs to disposable element, each fusing all needs in time to change spare unit, this not only brings the trouble of operation maintenance aspect, and system will lose the arc grounding protection before not changing spare unit; Secondly, owing to need to cut-off under the on-Line Voltage less line to line fault electric current, the accident of phase fault in the cabinet takes place to cause because of energy is excessive in high-voltage and current-limitation fuse often in interrupting process, will bring serious threat to the power supply reliability of system.

The utility model content

The purpose of this utility model is to provide a kind of reliability height, arc-extinction device easy to maintenance.

For achieving the above object, a kind of arc-extinction device that the utility model provides comprises shell, is provided with vacuum circuit-breaker in the enclosure space that described shell surrounded, one end of vacuum circuit-breaker links to each other with the three-phase main bus bar by isolating switch K, and the other end of vacuum circuit-breaker is by ground connection copper bar ground connection.

The vacuum circuit-breaker that the utility model adopts phase-splitting to control replaces high-voltage and current-limitation fuse and the vacuum contactor in the fuse wire type arc-extinction device, guarantee in scope, to cut-off various phase fault electric currents less than rated short circuit drop-out current, the reliability height, make this device to be repeatedly used simultaneously, be convenient to safeguard.

Description of drawings

Fig. 1 is an electric primary system winding diagram of the present utility model;

Fig. 2 is an internal structure schematic diagram of the present utility model;

Fig. 3 is an external structure schematic diagram of the present utility model.

Embodiment

A kind of arc-extinction device, comprise shell, be provided with vacuum circuit-breaker 20 in the enclosure space that shell 10 is surrounded, one end of vacuum circuit-breaker 20 links to each other with three-phase main bus bar 30 by isolating switch K, main bus bar 30 passes in wall bushing 70, the other end of vacuum circuit-breaker 20 is by ground connection copper bar ground connection, vacuum circuit-breaker 20 can reliably cut-off various phase fault electric currents in less than the scope of rated short circuit drop-out current, rated current can be accomplished 1250 amperes, the needs that bear the single-phase capacitive earth current of sorts of systems have for a long time been satisfied, as shown in Figure 1, 2, 3.

In conjunction with Fig. 1,2, described vacuum circuit-breaker 20 comprises first, two, three vacuum circuit-

breakers

21,22,23, isolating switch K comprises first, two, three isolating switch K1, K2, K3, first, two, three vacuum circuit-

breakers

21,22,23 upper contact head is respectively with first, two, three isolating switch K1, K2, the end of K3 links to each other, first, two, three isolating switch K1, K2, the other end of K3 connects three-phase main bus bar 30 respectively, the disconnecting link of isolating switch K links to each other with the operating mechanism 80 that is in shell 10 outsides by steel pipe 90, control disconnection and the closure of internal isolating switch K by control operation mechanism 80 externally, guaranteed the fail safe of this device, the handle of pulling operation mechanism 80, isolating switch K is in off-state, the outage of this device; The handle of push-up operation mechanism 80, isolating switch K is in closure state, and this device is charged.The following contact of first, second and third vacuum circuit-

breaker

21,22,23 is respectively by ground connection copper bar ground connection, the ground connection copper bar passes from current transformer CT and through ground hole 11 ground connection, with realization non-stable arc grounding fault is converted into stable metallic earthing fast.

In conjunction with Fig. 1,2,3, described current transformer CT goes up subsidiary ammeter 12, the secondary side two of current transformer CT terminates at ground connection behind the two ends of ammeter 12, ammeter 12 is arranged on the surface of shell 10, after the action of this arc extinguishing device for switch, the user can be by the steady-state current value of ammeter 12 direct read-out system single phase ground faults.High-tension fuse 40 comprises first, second and third high-tension fuse 41,42,43, the input of first, second and third high-tension fuse 41,42,43 connects three-phase main bus bar 30 by first, second and third isolating switch K1, K2, K3 respectively, the output of first, second and third high-tension fuse 41,42,43 is connected with the input of voltage transformer pt, the other end ground connection of voltage transformer pt.

In conjunction with Fig. 1,2, the input of overvoltage protection device 50 is connected on respectively on the input of first, second and third high-tension fuse 41,42,43, the other end ground connection of overvoltage protection device 50.Described overvoltage protection device 50 comprises the zinc oxide valve plate that four head ends join; wherein the tail end of first, second and third zinc oxide valve plate FR1, FR2, FR3 is connected respectively and is connected on the input of three high-tension fuses 40 behind first, second and third discharging gap CG1, CG2, the CG3, the tail end of the 4th zinc oxide valve plate FR4 ground connection behind the 4th discharging gap CG4 of connecting.

In conjunction with Fig. 1,2, also be provided with intelligent controller 60 in the enclosure space that described shell 10 is surrounded, the signal of telecommunication that intelligent controller 60 collection current transformer CT and voltage transformer pt send, control vacuum circuit-breaker 20 is carried out corresponding actions.Specifically; intelligent controller 60 is gathered, is judged by the secondary voltage to voltage transformer pt; timely and accurately the various ground states of electrical network are analyzed, and taked corresponding action, intelligent controller 60 can be realized functions such as liquid crystal display, telecommunication and data protection simultaneously.Intelligent controller 60 is judged fault type and separate rapidly and accurately within 5 milliseconds, add the closing time of vacuum circuit-breaker 20, can about 15 milliseconds after single-phase arc grounding fault takes place in system actions, realize rapid arc extinction, shortened the duration of single-phase arc grounding fault greatly.When user's mis-wired or element fault cause vacuum circuit-breaker 20 false switchings of non-fault phase, or fault phase vacuum circuit-breaker 20 moves when another again ground connection is taken place mutually afterwards, the current signal that intelligent controller 60 is sent by current transformer CT, variation according to current instantaneous value and current changing rate, can about 1 millisecond, judge two-phase short-circuit fault and send the separating brake order to vacuum circuit-breaker 20, add the opening time of vacuum circuit-breaker 20, whole switch off time can be controlled in 6 milliseconds, even cause non-fault phase vacuum circuit-breaker 20 actions because of the erroneous judgement of intelligent controller 60 is disconnected, also can avoid the normal operation of system is impacted.

Be described further below in conjunction with Fig. 1,2,3 pairs of the utility model.

When single phase ground fault took place, vacuum circuit-breaker 20 can move about 15 milliseconds, with the direct mutually ground connection of fault; If single-phase arc grounding fault takes place, then can extinguish ground arc rapidly and the arc grounding overvoltage is stablized the level of on-Line Voltage, can effectively avoid the phase fault accident that causes because of arc grounding and accidents such as the ferro resonance that causes because of the arc grounding overvoltage and Explosion of on Arrester; If the metallic earthing fault takes place, then can reduce touch voltage and step voltage greatly, help support equipment and personal safety.The user can observe the inner working condition of this device by being arranged on shell 10 lip-deep observation windows 13.

When the PT disconnection fault takes place when; intelligent controller 60 output switching value contact point signals; so that the user is to causing the relaying protection of misoperation to carry out locking because of the PT broken string; send alarm signal simultaneously; intelligent controller 60 panels show fault type (PT broken string, fault earthing) and separate, output passive switch amount contact point signal.In addition, this arc extinguishing device for switch has the emergency review function, can write down the time of 18 fault generations and the type of fault.This arc extinguishing device for switch has also disposed the RS485 interface, can carry out data according to the communication protocol that the user provides and transmit.Voltage transformer CT in this arc extinguishing device for switch can provide signal to measuring instrument and relaying protection, can replace conventional PT cabinet.

In sum, high-voltage and current-limitation fuse and vacuum contactor that core of the present utility model is to adopt the Fast Speed Vacuum Circuit Breaker 20 of phase-splitting control to replace in the fuse wire type arc-extinction devices, the closing time of vacuum circuit-breaker can be controlled at about 10 milliseconds, has shortened the duration of arc grounding fault to greatest extent; The opening time of vacuum circuit-breaker lays the first stone for cut-offfing fault before reaching peak value at the line to line fault electric current about 5 milliseconds, has solved problem operate time of executive component.Simultaneously, this device can reliably cut-off various phase fault electric currents in less than the scope of rated short circuit drop-out current, easy to maintenance, has saved the expense of changing high-voltage and current-limitation fuse.In addition, owing to reduced element in the cabinet, for condition has been created in further miniaturization, the unitization of physical dimension.

Claims

1. arc-extinction device, comprise shell, it is characterized in that: be provided with vacuum circuit-breaker (20) in the enclosure space that described shell (10) is surrounded, one end of vacuum circuit-breaker (20) links to each other with three-phase main bus bar (30) by isolating switch K, the other end of vacuum circuit-breaker (20) is by ground connection copper bar ground connection, described vacuum circuit-breaker (20) comprises first, two, three vacuum circuit-breakers (21,22,23), isolating switch K comprises first, two, three isolating switch K1, K2, K3, first, two, three vacuum circuit-breakers (21,22,23) upper contact head is respectively with first, two, three isolating switch K1, K2, the end of K3 links to each other, first, two, three isolating switch K1, K2, the other end of K3 connects three-phase main bus bar (30) respectively, first, two, three vacuum circuit-breakers (21,22,23) following contact is respectively by ground connection copper bar ground connection, the ground connection copper bar passes from current transformer CT, current transformer CT ground connection.

2. arc-extinction device according to claim 1, it is characterized in that: high-tension fuse (40) comprises first, second and third high-tension fuse (41,42,43), three's input connects three-phase main bus bar (30) by first, second and third isolating switch K1, K2, K3 respectively, three's output is connected with the input of voltage transformer pt, the other end ground connection of voltage transformer pt.

3. arc-extinction device according to claim 1; it is characterized in that: the input of overvoltage protection device (50) is connected on respectively on the input of first, second and third high-tension fuse (41,42,43); the other end ground connection of overvoltage protection device (50); also be provided with intelligent controller (60) in the enclosure space that described shell (10) is surrounded; the signal of telecommunication that intelligent controller (60) collection current transformer CT and voltage transformer pt send, control vacuum circuit-breaker (20) is carried out corresponding actions.

4. arc-extinction device according to claim 1 is characterized in that: the secondary side two of described current transformer CT terminates at ground connection behind the two ends of ammeter (12), and ammeter (12) is arranged on the surface of shell (10).

5. arc-extinction device according to claim 3; it is characterized in that: described overvoltage protection device (50) comprises the zinc oxide valve plate that four head ends join; wherein the tail end of first, second and third zinc oxide valve plate FR1, FR2, FR3 is connected respectively and is connected on the input of three high-tension fuses (40) behind first, second and third discharging gap CG1, CG2, the CG3, the tail end of the 4th zinc oxide valve plate FR4 ground connection behind the 4th discharging gap CG4 of connecting.