CN100454462C - Very high breaker in use for GIS - Google Patents

Very high breaker in use for GIS Download PDF

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Publication number
CN100454462C
CN100454462C CNB2006100699897A CN200610069989A CN100454462C CN 100454462 C CN100454462 C CN 100454462C CN B2006100699897 A CNB2006100699897 A CN B2006100699897A CN 200610069989 A CN200610069989 A CN 200610069989A CN 100454462 C CN100454462 C CN 100454462C
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CN
China
Prior art keywords
contact
resistance
moving contact
arc extinguishing
point
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CNB2006100699897A
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CN1959892A (en
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王光顺
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王光顺
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Priority to CNB2006100699897A priority Critical patent/CN100454462C/en
Publication of CN1959892A publication Critical patent/CN1959892A/en
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Publication of CN100454462C publication Critical patent/CN100454462C/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/04Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/16Impedances connected with contacts
    • H01H33/166Impedances connected with contacts the impedance being inserted only while closing the switch
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H2033/028Details the cooperating contacts being both actuated simultaneously in opposite directions

Abstract

The invention relate to breaker, especially to super high-voltage circuit breaker in use for GIS. The disclosed breaker includes breaking contactor mechanism, and operating mechanism for switching on/off resistances, and controlling action of breaking contactor mechanism. Through pull rod and regulating lever, one set of operating mechanism can control two sets of breaking contactor mechanism since technique of adjusting compression spring for moving contactor is utilized. The invention possesses breaking function at double speed, reduces kinetic resistance of moving contactor, and quickens breaking speed. Stepped breaking technique adopted in the invention lowers over voltage of operation greatly, as well as increases rated capacity and breaking capacity greatly. The invention also reduces cost of equipment and difficulties for manufacturing the disclosed breaker.

Description

A kind of breaker in extra high voltage that is used for GIS
Technical field
The present invention relates to a kind of circuit breaker, be particularly useful for being used for the breaker in extra high voltage of GIS.
Background technology
GIS is sulfur hexafluoride gas-insulating and fully-enclosed power distribution equipment.Its English full name GAS-INSTULATED SWITCHGEAR is called for short GIS.Power system device often will be used circuit breaker, and generalized information system is no exception.The faster the better, the time is short more good more to require breaking speed in the time of as high pressure or breaker in extra high voltage use, because the moving contact of high voltage electric equipment and fixed contact are easy to generate electric arc in the time of approaching, the time of the fast more generation electric arc of breaking speed is short more, and is more little to the infringement of equipment.In addition, the alive circuit that long distance is non-loaded or load is very little minute, can in electrical network, form very high switching overvoltage when closing a floodgate.If the special equipment of these overvoltage neither ones is limited, in extra-high voltage grid, will take excessive insulation measures so, and this will inevitably increase considerably cost.The important channel of restriction switching overvoltage is exactly to come these circuit are switched with the circuit breaker that opening and closing resistor is housed, and opening and closing resistor can be with overvoltage Limiting a relatively low level.The breaker in extra high voltage that uses as generalized information system satisfies above the requirement except that necessary, and electric pressure has had higher requirement to insulation property after improving, and gas pressure need be brought up to more than the 0.3Mpa.All components and parts comprise that circuit breaker all is placed in the cylindrical housing that the metal material of ground connection makes.
Summary of the invention
The purpose of this invention is to provide the breaker in extra high voltage that is used for GIS that a kind of compact conformation, breaking speed are fast, can effectively reduce switching overvoltage.
For achieving the above object, the present invention adopts following technical scheme:
A kind of breaker in extra high voltage that is used for GIS of the present invention, the operating mechanism that comprises break contact device, opening and closing resistor and driving break contact device action, it is characterized in that: the break contact device is installed in the metal shell, and resistance box is fixedly mounted on the two ends of metal shell; The break contact device comprises moving contact and fixed contact, and fixed contact comprises main contacts, resistance contact point and arcing contact, and moving contact comprises and the corresponding active of fixed contact contact, resistance moving contact and arc extinguishing moving contact; Main contacts is electrically connected with the arcing contact, and initiatively contact, resistance moving contact and arc extinguishing moving contact are electrically connected, among three pairs of contacts, and the movement clearance maximum between main contacts and the active contact, the movement clearance minimum between resistance contact point and the resistance moving contact; Opening and closing resistor is fixedly mounted on the inside of resistance box, and be electrically connected with the arcing contact that is arranged in metal shell by lead one end, the other end is electrically connected with resistance contact point, also be provided with equalizing capacitance in the metal shell, one end of equalizing capacitance is electrically connected with opening and closing resistor by lead, and the other end is electrically connected with moving contact by flexible conductor; Moving contact and operating mechanism are in transmission connection.
Main contacts, resistance contact point and arcing contact all are actively plugged on the insulation guide plate, have the creepage skirt of annular projection on the insulation guide plate.
Described opening and closing resistor be multilayer around resistance, constitute by the multilayer resistance wire series connection that is looped around on the skeleton, and the adjacent two layers resistance wire is opposite around direction.
Opening and closing resistor comprises one-level resistance and secondary resistance, and Dui Ying resistance contact point comprises one-level resistance contact point, secondary resistance contact point with it, and the resistance moving contact comprises one-level resistance moving contact and secondary resistance moving contact; Wherein, one-level resistance is electrically connected with the one-level resistance contact point, connects with secondary resistance after secondary resistance contact point and the equalizing capacitance parallel connection; Movement clearance between one-level resistance contact point and the one-level resistance moving contact is less than the movement clearance between secondary resistance contact point and the secondary resistance moving contact.
The main contacts of fixed contact, resistance contact point and arcing contact are connected with insulation guide plate elasticity by spring respectively, and main contacts is electrically connected by flexible conductor with the arcing contact, and the end of main contacts is electrically connected with the connecting rod that fixedly is inserted in the end casing; Elastic movement gap between main contacts and the insulation guide plate is less than the elastic movement gap between arcing contact and the insulation guide plate; Elastic movement gap between resistance contact point and the insulation guide plate is greater than the elastic movement gap between arcing contact and the insulation guide plate; The end of resistance contact point is electrically connected with the resistance binding post that fixedly is inserted in the end casing by flexible conductor; The active contact of moving contact, resistance moving contact and arc extinguishing moving contact all are actively plugged on the interior insulation support plate, external insulation supporting bracket and interior insulation support plate secured in parallel are installed in the metal shell, and the arc extinguishing moving contact also is actively plugged in the external insulation supporting bracket simultaneously; Be installed with conductive plate on the arc extinguishing moving contact, conductive plate is between interior insulation support plate and external insulation supporting bracket; Initiatively contact and resistance moving contact link together by this conductive plate and arc extinguishing moving contact, initiatively the position of contact, resistance moving contact, arc extinguishing moving contact is corresponding with main contacts, resistance contact point, arcing contact respectively, be provided with cylinder sleeve with resistance moving contact, the corresponding position of arc extinguishing moving contact on the interior insulation support plate, have piston on resistance moving contact, the arc extinguishing moving contact, and form piston with the inwall of cylinder sleeve and cooperate, the piston of arc extinguishing moving contact and resistance moving contact is provided with the arc blow-out pipe, and the arc blow-out pipe runs through the piston on arc extinguishing moving contact or the resistance moving contact; Have the exhaust outlet that unidirectional valve is installed on the piston; The end of arc extinguishing moving contact has connecting plate.
The center fixed of resistance box is installed the connecting rod extension rod, opening and closing resistor around be arranged on the connecting rod extension rod around, the top of connecting rod extension rod is equipped with ratchet mechanism, this ratchet mechanism is connected with the connecting rod that is fixedly mounted on the arcing contact, position corresponding with ratchet mechanism on the connecting rod has tooth bar, and the ratchet on the ratchet mechanism is installed in the tooth bar.
Be respectively installed with in the resistance moving contact cover in the cover and arc extinguishing moving contact on resistance moving contact and the arc extinguishing moving contact, overlap in cover and the arc extinguishing moving contact in the resistance moving contact and be positioned at cylinder sleeve, and be movably connected on the interior insulation support plate by balancing spring.
Moving contact is in transmission connection by transmission case and operating mechanism, this transmission case comprise transfer case and with transfer case support and connection cover connected vertically, the two ends of transfer case are connected with the movable contact head end of two break contact devices respectively, and the stationary contact of these two break contact devices respectively connects a resistance box that has an opening and closing resistor; By the hinge symmetry two connecting levers are installed in the transfer case, have on the connecting lever two with pin joint constitute leg-of-mutton tie point, one of them tie point and moving contact are hinged, another tie point is connected on the pull bar, pull bar is installed in the support and connection cover, and is connected with operating mechanism.
Main contacts has a plurality of, is looped around evenly distributing of arcing contact on every side, and initiatively the quantity and the position of contact are corresponding with main contacts.
After adopting technique scheme, the present invention has following advantage:
1, only need to adopt once the cover operating mechanism and can realize control to two break contact devices, production cost is low, manufacture difficulty descends significantly, control action is reliable.
Electric arc and overvoltage level when 2, the multistage break contact of combination effectively reduces disjunction have improved and have cut-off capacity.
3, multilayer effectively reduces voltage between layers around resistance, makes to basically form idiostaticly between each resistance, helps reducing insulating requirements.
4, with the resistance moving contact is not set in cover compare with the break contact device that overlaps in the arc extinguishing moving contact, form the compression ratio raising that piston cooperates between resistance moving contact and arc extinguishing moving contact and the cylinder sleeve, effectively balanced by the arc extinguishing air-flow that the arc blow-out pipe blows out, improved the arc extinguishing ability, reduce the resistance of motion of moving contact, help improving breaking speed.
5, the spring on each contact of fixed contact increases substantially breaking speed, realizes doubly fast disjunction, has improved the arc extinguishing ability.
6, the setting of two-stage opening and closing resistor, compare sub-switching operation overvoltage multiple with the circuit breaker that adopts single opening and closing resistor and reduce about 30%, and can be by the effect of the opening and closing resistor in the secondary sub-gate resistance replacement isolating switch, reduce isolating switch significantly because of cutting off the switching overvoltage that the equalizing capacitance electric current causes, supporting with it isolating switch does not need to be provided with opening and closing resistor again, reduces the manufacturing cost of isolating switch greatly.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the present of invention;
Fig. 2 is the A-A cutaway view schematic diagram of Fig. 1;
Fig. 3 is the B-B cutaway view of Fig. 1;
Fig. 4 is the C-C cutaway view of Fig. 1;
Fig. 5 is an electrical schematic diagram of the present invention;
Fig. 6 is the D part partial enlarged drawing of Fig. 1;
Fig. 7 is the E part partial enlarged drawing of Fig. 1.
Embodiment
As shown in Figure 5, a kind of breaker in extra high voltage that is used for GIS of the present invention comprises break contact device, opening and closing resistor 3 and handles the operating mechanism of break contact device action.The break contact device comprises moving contact and fixed contact, and fixed contact comprises main contacts 4, resistance contact point 5 and arcing contact 6, and moving contact comprises and the corresponding active of fixed contact contact 7, resistance moving contact 8 and arc extinguishing moving contact 9; Main contacts 4 is electrically connected with arcing contact 6, and initiatively contact 7, resistance moving contact 8 and arc extinguishing moving contact 9 are electrically connected, among three pairs of contacts, and the movement clearance maximum between main contacts 4 and the active contact 7, the movement clearance minimum between resistance contact point 5 and the resistance moving contact 8; Opening and closing resistor 3 is fixedly mounted on the inside of resistance box 2, and be electrically connected with the arcing contact 6 that is arranged in metal shell 1 by lead one end, the other end is electrically connected with resistance contact point 5, and an end of equalizing capacitance 10 is electrically connected with opening and closing resistor 3 by lead, and the other end is electrically connected with moving contact; Metal shell 1 is connected with ground wire with resistance box 2.
During disjunction, by manipulation operations mechanism moving contact is moved, because the movement clearance maximum between main contacts 4 and the active contact 7, so main contacts 4 at first separates with active contact 7, this moment is because resistance contact point 5 and resistance moving contact 8, arcing contact 6 and arc extinguishing moving contact 9 still closure, can not produce electric arc, can avoid electric arc to burn out main contacts 4.Moving contact continues to move, and separate with arc extinguishing moving contact 9 arcing contact 6, and can effectively reduce arc stiffness arcing contact 6 on because resistance contact point 5 is still closed with resistance moving contact 8 this moment; At last, when resistance contact point 5 separated with resistance moving contact 8, because the effect of opening and closing resistor 3, the electric arc on the resistance contact point 5 also was effectively controlled, and switching overvoltage is reduced significantly.
Here, the effect of equalizing capacitance 10 is to guarantee that identical voltage is arranged between the arcing contact of two fractures and the resistance contact point, and it is inhomogeneous and cause arc reignition to prevent voltage distribution.
Principle in the making process is similar to the above, at first is that resistance contact point 5 engages with resistance moving contact 8, is that arcing contact 6 engages with arc extinguishing moving contact 9 then, is only main contacts 4 at last and engages with active contact 7.Can avoid equally on main contacts 4, producing electric arc, prevent the infringement of electric arc, prolong the useful life of main contacts 4 main contacts 4.And ensure at first process opening and closing resistor 3 connections of switching current, and directly connect by main contacts 4 and active contact 7 again, effectively reduce the multiple of closing overvoltage.
Equalizing capacitance 10 can produce the vibration overvoltage in the moment of isolating switch branch, closing operation, the effect that is connected on the opening and closing resistor 3 on the equalizing capacitance 10 is at isolating switch branch, fashionable absorption vibration overvoltage energy, and reduces the oscillating voltage that extinguishes repeatedly, restrikes and produce because of electric arc.
The mechanical structure of present embodiment is shown in Fig. 1-4.The operating mechanism that comprises break contact device, opening and closing resistor 3 and manipulation break contact device action.Two break contact devices are installed in respectively in the metal shell 1, and resistance box 2 is fixedly mounted on the two ends of metal shell 1; The break contact device comprises moving contact and fixed contact.Moving contact is in transmission connection by transmission case and operating mechanism, this transmission case comprises transfer case 24 and overlaps 25 with transfer case 24 support and connection connected vertically, the two ends of transfer case 24 are connected with the movable contact head end of two break contact devices respectively, and the stationary contact of these two break contact devices respectively connects a resistance box 2 that has an opening and closing resistor 3; By the hinge symmetry two connecting levers 26 are installed in the transfer case 24, have on the connecting lever 26 two with pin joint constitute leg-of-mutton tie point, one of them tie point and moving contact are hinged, another tie point is connected on the pull bar 27, pull bar 27 is installed in the support and connection cover 25, and is connected with operating mechanism.
Fixed contact comprises main contacts 4, resistance contact point 5 and arcing contact 6, and moving contact comprises and the corresponding active of fixed contact contact 7, resistance moving contact 8 and arc extinguishing moving contact 9; Opening and closing resistor 3 has a plurality of, is fixedly mounted on the inside of resistance box 2, and is electrically connected with the arcing contact 6 that is arranged in metal shell 1 by lead one end, and the other end is electrically connected with resistance contact point 5; Equalizing capacitance 10 also is arranged in the metal shell 1, one end of equalizing capacitance 10 is electrically connected with opening and closing resistor 3 by lead, the other end is electrically connected with arc extinguishing moving contact 9 by flexible conductor, connects with opening and closing resistor 3 after making equalizing capacitance 10 and resistance contact point 5 parallel connections again; Moving contact and operating mechanism are in transmission connection.
The main contacts 4 of fixed contact, resistance contact point 5 and arcing contact 6 all are actively plugged on the insulation guide plate 11, and insulation guide plate 11 is fixedly installed in the metal shell 1, and the end face of metal shell 1 fixedly installs end casing 13.Main contacts 4 and arcing contact 6 are electrically connected by flexible conductor.Arcing contact 6 is positioned at the center of insulation guide plate 11, spring housing is contained on the arcing contact 6, and by be fixed on the arcing contact 6 spring base with spring be fixed on spring base and the insulation guide plate 11 between, be fixed with the positioning tube of tubular on the insulation guide plate 11 of spring base below, be enclosed within the outside of spring.The effect of positioning tube is spring can be located on the one hand, also just can adjust the movement clearance of arcing contact 6 by the height of adjusting positioning tube on the other hand, so that match with the time difference of other contacts.Main contacts 4, resistance contact point 5 are the same with arcing contact 6, all adopt this similar structure to be connected with insulation guide plate 11 elasticity by spring respectively.As shown in Figure 3, main contacts 4 and resistance contact point 5 can be 2 or a plurality of, spacer ring around be arranged on arcing contact 6 around.Be provided with by this annular, the diameter of arcing contact 6 is significantly increased, the curvature on top reduces, and can effectively reduce the resume combustion of capacitive electric arc.In addition, main contacts 4 separate with resistance contact point 5 be provided with after, the contact volume is little, and is in light weight, motional inertia reduces, the speed of help improving branch, closing a floodgate.In the design of main contacts 4, main contacts 4 splits can be designed to a plurality of, be looped around arcing contact 6 around, evenly distribute, thus improve main contacts 4 net sectional area, increase substantially the rated capacitance of circuit breaker; Certainly, after the main contacts 4 splits design, the split setting is also wanted in corresponding with it active contact 7, and its quantity is corresponding with main contacts 4 with the position.Main contacts 4 and arcing contact 6 are electrically connected by flexible conductor, and the end of main contacts 4 is electrically connected with connecting rod 14 in fixedly being inserted into end casing 13, and arcing contact 6 is inserted in the connecting rod 14 slidably; When designing the length of each contact, make main contacts 4 and the elastic movement gap of insulation between the guide plate 11 less than arcing contact 6 and the elastic movement gap of insulating between the guide plate 11; Elastic movement gap between resistance contact point 5 and the insulation guide plate 11 is greater than the elastic movement gap between arcing contact 6 and the insulation guide plate 11; The end of resistance contact point 5 is electrically connected with resistance binding post 15 in fixedly being inserted into end casing 13 by flexible conductor;
Active contact 7 and resistance moving contact 8 that moving contact comprises interior insulation support plate 16, the external insulation supporting bracket 17 that is fixedly installed in the metal shell 1 and is inserted into the arc extinguishing moving contact 9 that can slide up and down in the two-layer insulation support plate, can slides in the insulation support plate 16 in being inserted into.At the partial fixing between interior insulation support plate 16 and external insulation supporting bracket 17 on the arc extinguishing moving contact 9 conductive plate 18 is installed, initiatively contact 7 and resistance moving contact 8 link together with arc extinguishing moving contact 9 by this conductive plate 18, difference is: initiatively contact 7 is fixedly connected on the conductive plate 18, and resistance moving contact 8 is in the sliding sleeve that is actively plugged on the conductive plate 18, and between the end of resistance moving contact 8 and conductive plate 18, be connected with energy-stored spring, can the compressed energy-storage spring when conductive plate 18 moves down.In initiatively contact 7, resistance moving contact 8, arc extinguishing moving contact 9 are inserted into respectively slidably on the insulation support plate 16, its position is corresponding with main contacts 4, resistance contact point 5, arcing contact 6 respectively, is provided with cylinder sleeve with resistance moving contact 8, arc extinguishing moving contact 9 corresponding positions on the interior insulation support plate 16.Have piston on resistance moving contact 8 and the arc extinguishing moving contact 9 and lay respectively in separately the cylinder sleeve, form piston with the inwall of cylinder sleeve and cooperate.In order to utilize Compressed Gas in the cylinder sleeve to improve the efficient of arc extinguishing, the piston of resistance moving contact 8 and arc extinguishing moving contact 9 is provided with the arc blow-out pipe 20 that connects piston, and the upper end open of arc blow-out pipe 20 is respectively towards the top of resistance moving contact 8 and arc extinguishing moving contact 9.In order to reduce the combined floodgate resistance, can also on piston, be provided with the exhaust outlet of unidirectional valve.In order to improve compression ratio, on resistance moving contact 8 and arc extinguishing moving contact 9, be respectively installed with in the resistance moving contact in cover 22 and the arc extinguishing moving contact and overlap 23, overlap in 23 cylinder sleeves that lay respectively at separately in interior cover 22 of resistance moving contact and the arc extinguishing moving contact, and be connected on the interior insulation support plate 16 by balancing spring is unsteady.Concrete unsteady connected mode can have multiple, for example, can be as shown in this embodiment, the lower end edge circumference of cover 23 evenly is provided with many guide posts in cover 22 and the arc extinguishing moving contact in the resistance moving contact, guide post is inserted on the interior insulation support plate 16, and it can be slidably reciprocated on interior insulation support plate 16, on guide post, be set with balancing spring.Like this, when cover 23 in cover 22 or the arc extinguishing moving contact in the resistance moving contact is compressed gas pressure and reach the desirable arc extinguishing force value of setting, balancing spring can be compressed, the speed that inner cylinder pressure is raise is slowed down, and to reduce the resistance of motion of moving contact, improves opening velocity.After external force disappeared, balancing spring can restore again.For the tensile force that gives of adjustment spring, can also nut be installed at the end of guide post, adjust the effective length of guide post by regulating nut, thereby adjust the tensile force that gives of balancing spring.
Certainly, can satisfy at technical parameter under the situation of actual needs, also can only on arc extinguishing moving contact 9, be provided with in the unsteady arc extinguishing moving contact and overlap 23, overlap 22 and on resistance moving contact 8, be provided with in the fixing resistance moving contact.
For the ease of being connected, have connecting plate at the end of arc extinguishing moving contact 9 with operating mechanism.
For guarantee that main contacts 4 does not produce electric arc when closing a floodgate, guarantee opening and closing resistor 3 effective turn-on time, prevent closing overvoltage, under gate-dividing state, should guarantee that the distance between main contacts 4 and the active contact 7 is maximum, distance between arcing contact 6 and the arc extinguishing moving contact 8 secondly, the distance minimum between resistance contact point 5 and the resistance moving contact 8.That is to say that as shown in this embodiment, under the identical situation of each contact length of moving contact, the main contacts 4 on the fixed contact is the shortest, takes second place in arcing contact 6, and resistance contact point 5 is the longest.
In order to prolong creepage distance, the creepage skirt of annular projection can be set on insulation guide plate 11.
A plurality of opening and closing resistor 3 groupings are provided with, and are fixedly mounted in the resistance box 2.As Fig. 1, shown in Figure 4, opening and closing resistor 3 is fixedly mounted in the resistance box 2, around be arranged on connecting rod extension rod 28 around.The top of connecting rod extension rod 28 is equipped with ratchet mechanism, this ratchet mechanism is connected with the connecting rod 14 that is fixedly mounted on the arcing contact 6, position corresponding with ratchet mechanism on the connecting rod 14 has tooth bar, ratchet on the ratchet mechanism is installed in the tooth bar, can rotate ratchet by the handle that extends to the outside, rotation by ratchet is with connecting rod 14 and connecting rod extension rod 28 plug-in mountings and lock together, when needing dismounting also as long as the opposite spin ratchet.Resistance box 2 adopts metal material to make, the two ends of resistance box 2 fixedly mount resistance box support arm 29, the resistance box inner support 30 that insulating material is made respectively, the two ends of connecting rod extension rod 28 are inserted into respectively in resistance box support arm 29 and the resistance box inner support 30, resistance box inner support 30 1 sides are fixedly connected on an end of metal shell 1, and connecting rod extension rod 28 is plugged on connecting rod 14.
As shown in Figure 4, opening and closing resistor 3 is divided into 2 groups, and every is all adopted multilayer around resistance, be made of the multilayer resistance wire that is looped around on the skeleton, and the adjacent two layers resistance wire is opposite around direction.Like this, total voltage drop can be dispersed on the metallic resistance silk between the different layers, and electromagnetic field is cancelled out each other.Outer current potential is basic identical between each resistance, can compress and arrange the space, increases resistance capacity.In addition, the metallic resistance silk is bigger than the specific heat of traditional carbon-point resistance, and when absorbing same heat, the temperature rise of metallic resistance silk helps using repeatedly, protecting insulating gas far below carbon-point resistance.
Two component switching-on resistances 3 are divided into one-level resistance 3A and secondary resistance 3B, and Dui Ying resistance contact point 5 comprises one-level resistance contact point 5A, secondary resistance contact point 5B with it, and resistance moving contact 8 comprises one-level resistance moving contact 8A and secondary resistance moving contact 8B; Wherein, one-level resistance 3A is electrically connected with one-level resistance contact point 5A, connects with secondary resistance 3B in secondary resistance contact point 5B and equalizing capacitance 10 backs in parallel; Movement clearance between one-level resistance contact point 5A and the one-level resistance moving contact 8A is less than the movement clearance between secondary resistance contact point 5B and the secondary resistance moving contact 8B.
When having only one-level resistance, circuit breaker is when cut-offfing circuit, after main contacts 4 cut-offs with active contact 7, arcing contact 6 disconnects earlier with arc extinguishing moving contact 9, and resistance contact point 5 is closed with resistance moving contact 8, and opening and closing resistor is connected in the line, residual charge on the circuit will leak by opening and closing resistor, through 1-2 power frequency period, resistance contact point 5 disconnects with resistance moving contact 8, finishes the course of action that cut-offs circuit.The effect of opening and closing resistor mainly is to reduce arcing contact 6 and the recovery voltage of arc extinguishing moving contact 9 in interrupting process.When cut-off with arc extinguishing moving contact 9 arcing contact 6, the resistance of opening and closing resistor was more little, and recovery voltage is low more, and it is favourable more to avoid restriking; The resistance of opening and closing resistor is more little, and when then cut-offfing resistance contact point 5 with resistance moving contact 8, recovery voltage is just big more, and easy more restriking produces vibration.Though opening and closing resistor has damping action, there is vibration overvoltage will occur, so when cut-offfing resistance contact point 5, wish that the resistance of opening and closing resistor is the bigger the better with resistance moving contact 8.Like this, to the demand of the resistance size of opening and closing resistor, in two processes cutting off nonloaded line, be contradiction.
In order to solve this contradiction to the resistance demand of opening and closing resistor, the present invention adopts the two-stage opening and closing resistor to solve.As shown in Figure 5, one-level resistance 3A directly connects with one-level resistance contact point 5A, connect with secondary resistance 3B again after secondary resistance contact point 5B and equalizing capacitance 10 parallel connections, and appropriate design two-stage contact and movement clearance, make length of spring compressed gap on the one-level resistance contact point 5A less than the length of spring compressed gap on the secondary resistance contact point 5B, simultaneously, under the disjunction state, gap between one-level resistance contact point 5A and the one-level resistance moving contact 8A is less than the gap between secondary resistance contact point 5B and the secondary resistance moving contact 8B, can make one-level resistance contact point 5A and secondary resistance contact point 5B disjunction successively and closure like this, during disjunction, one-level resistance contact point 5A disconnects earlier, disconnects behind the secondary resistance contact point 5B, and is then opposite when closed, secondary resistance contact point 5B is closed earlier, and is closed behind the one-level resistance contact point 5A.When cut-offfing circuit, at first cut-off with arc extinguishing moving contact 9 arcing contact 6, and this moment, total resistance diminished owing to one-level resistance 3A and secondary resistance 3B parallel connection, and the recovery voltage on arcing contact 6 and the arc extinguishing moving contact 9 is reduced to optimum state; Along with moving of moving contact, and through behind the certain hour, one-level resistance contact point 5A and one-level resistance moving contact 8A cut-off, this moment secondary resistance contact point 5B and still conducting of secondary resistance moving contact 8B, and be parallel with one-level resistance 3A on the one-level resistance contact point 5A, so can not produce too high recovery voltage on one-level resistance contact point 5A and the one-level resistance moving contact 8A; Subsequently, secondary resistance contact point 5B and secondary resistance moving contact 8B cut-off, at this moment since the resistance of secondary resistance 3B much larger than one-level resistance 3A, so the recovery voltage that produce this moment is very little, realizes that two process overvoltage value are all near optimum efficiency.Otherwise in the circuit making process, secondary resistance contact point 5B and secondary resistance moving contact 8B are at first closed, are only one-level resistance contact point 5A and one-level resistance moving contact 8A closure subsequently.
Certainly, initiatively the quantity of contact 4, resistance moving contact 5 is not limited to the quantity of enumerating in the present embodiment, also can be two or more.
In order to satisfy the time difference of each engage contacts, also can change the distance between each contact by the length of adjusting each contact on the moving contact, as long as the distance relation between each contact is with above-mentioned consistent.
The operation principle of break contact device is as follows:
When contact is initially at engagement state, main contacts 4 contact with contact 7 initiatively, and electric current is directly by active contact 7 and main contacts 4 conductings.When receiving breaking signal, operating mechanism drives moving contact and moves to the disjunction direction, and fixed contact overcomes spring under each contact frictional force effect of moving contact elastic force moves downward together.Meanwhile, spring is compressed under the effect of each contact, and when the spring base lower end on each contact of fixed contact moved to the positioning tube place, the tube that is positioned stopped, no longer move downward, and moving contact continues to move downward.
Because the free gap minimum of main contacts 4, what therefore at first disconnect is main contacts 4 and active contact 7.And this moment, resistance contact point 5, arcing contact 6 also engage with resistance moving contact 8, arc extinguishing moving contact 9 respectively, and most electric currents are through arcing contact 6 and arc extinguishing moving contact 9, so can not produce electric arc main contacts 4 and 7 disjunctions of active contact the time.
At this moment, moving contact continues to move downward, separate with arc extinguishing moving contact 9 arcing contact 6, because the arcing contact will cut off most line currents, so produce electric arc between the two, because the doubly effect of fast disjunction, through the time about 1 cycle, arc extinction on the arcing contact, resistance contact point 5 separates with resistance moving contact 8 subsequently.Under the double action of brake separating mechanism power and spring force, moving contact and fixed contact move round about with the relative velocity that doubles brake separating mechanism, and the electric arc that resistor current is produced extinguishes rapidly.
When cutting off big electric current, the heat energy that electric arc produces expands arc control device gas rapidly, promotes moving contact and quickens to the motion of disjunction direction electric arc to be extinguished more rapidly.Be further to improve arc extinguishing efficient, be provided with arc blow-out pipe 20 in a side of arc extinguishing moving contact 9, and on arc extinguishing moving contact 9 suit overlap 23 in the arc extinguishing moving contact, when arc extinguishing moving contact 9 produces Compressed Gas in cylinder sleeve when the separating brake direction moves.These gases blow to the top of arc extinguishing moving contact 9 on the one hand by arc blow-out pipe 20, electric arc is blown out, also oppress the interior cover 23 of arc extinguishing moving contact on the other hand and make the balancing spring compression, thereby make arc blow-out pipe 20 mouths of pipe can keep the comparatively gas pressure of balance, reach better arc extinguishing ability.After arc extinguishing moving contact 9 moved to extreme position, cover 23 rebounded under the balancing spring effect in the arc extinguishing moving contact, quenching time that can proper extension arc blow-out pipe 20.The effect that exhaust outlet is set is can pass through the exhaust outlet air inlet when arc extinguishing moving contact 9 when the combined floodgate direction moves, avoids producing in cylinder sleeve vacuum, the speed that influence is closed a floodgate.
The operation principle of cover 22 and top described similar in resistance moving contact 8 and the resistance moving contact.
Because main contacts 4, resistance contact point 5 and arcing contact 6 all are to be connected on the insulation guide plate 11 by spring floating, therefore these three contacts all have the ability of doubly fast disjunction when separating, promptly moving contact and fixed contact move respectively in the opposite direction in separating process, speed of related movement is fast, and arc quenching effect is good.Because the spring on the resistance contact point 5 is bigger than energy-stored spring hardness, at resistance contact point 5 with before resistance moving contact 8 separates, because the motion of conductive plate 18, energy-stored spring at first is compressed energy storage, resistance moving contact 8 ability setting in motions, and pulling resistance contact point 5 then, spring on the compression resistance contact 5, with after resistance moving contact 8 separates, energy-stored spring discharges up to resistance contact point 5, promotes 8 accelerated motions of resistance moving contact.Improve the separating rate of resistance contact point 5 and resistance moving contact 8 on the one hand, also can shorten the move distance of operating mechanism on the other hand, the easier designing requirement of satisfying the 9 three ten milliseconds of separation in 8 hysteresis arcing contacts of resistance moving contact.
During feed motion, drive unit drives moving contact and moves upward, because resistance contact point 5 is the longest, that is to say that the distance between resistance contact point 5 and the resistance moving contact 8 is minimum, therefore, resistance contact point 5 is at first connected with resistance moving contact 8, with opening and closing resistor 3 places in circuit, resistance contact point 5 is connected about 10 milliseconds of back with resistance moving contact 8, and arcing contact 6 is connected with arc extinguishing moving contact 9, main circuit is connected, and the electric current in the main circuit is by arcing contact 6 and 9 conductings of arc extinguishing moving contact; Be only main contacts 4 and initiatively contact 7 connections at last.Because opening and closing resistor 3 inserted before main circuit was connected, and circuit is charged in advance, the steepness that line voltage waveform changes when making the main circuit conducting slows down, thereby avoids producing closing overvoltage.During combined floodgate; if close a floodgate on the electric network fault circuit; can produce bigger combined floodgate electric arc; but because arcing contact 6 is connected earlier; therefore most electric arc all is created on the arcing contact 6; main contacts 4 can not produce electric arc almost connecting with active contact 7 under the idiostatic situation, and protection main contacts 4 is not burnt out.
Moving contact is in transmission connection by transmission case and operating mechanism, this transmission case comprises transfer case 24, with transfer case 24 support and connection covers 25 connected vertically, the two ends of transfer case 24 are connected with the movable contact head end of two break contact devices respectively, and the stationary contact of these two break contact devices respectively connects a resistance box 2 that has an opening and closing resistor 3; By the hinge symmetry two connecting levers 26 are installed in the transfer case 24, have on the connecting lever 26 two with pin joint constitute leg-of-mutton tie point, connecting plate 21 on one of them tie point and the moving contact is hinged, another pin joint is connected on the pull bar 27 by connection, pull bar 27 is installed in the support and connection cover 25, and is connected with operating mechanism.
Connecting lever 26 adopts insulating material to make, and the connecting plate 21 of two break contact devices is electrically connected by flexible conductor.In order to prolong creepage distance, prevent creeping discharge, the creepage skirt of bar dress projection is set on connecting lever 26.
Though adopt multistage disjunction combination contact, and each contact existence motion time difference, owing to use fixed contact compression spring adjustment technology,, the present invention sends out proper operation so only just finishing all contacts with an operating mechanism.Operating mechanism can have multiple, and its purpose is as long as can move up and down by control operating rod 27.Can utilize after having multiple operating mechanism to increase power in the prior art, be not described in detail in this.
As shown in Figure 1, when operating mechanism pulled down pull bar 27, pull bar 27 drove connecting lever 26 rotations, and moving contact is moved to the disjunction direction; Otherwise when operating mechanism upwards pushed away pull bar 27, pull bar 27 drove connecting lever 26 rotations, and moving contact is moved to the combined floodgate direction.

Claims (9)

1, a kind of breaker in extra high voltage that is used for GIS, the operating mechanism that comprises break contact device, opening and closing resistor (3) and driving break contact device action, it is characterized in that: the break contact device is installed in the metal shell (1), and resistance box (2) is fixedly mounted on the two ends of metal shell (1); The break contact device comprises moving contact and fixed contact, and fixed contact comprises main contacts (4), resistance contact point (5) and arcing contact (6), and moving contact comprises and the corresponding active of fixed contact contact (7), resistance moving contact (8) and arc extinguishing moving contact (9); Main contacts (4) is electrically connected with arcing contact (6), initiatively contact (7), resistance moving contact (8) and arc extinguishing moving contact (9) are electrically connected, among three pairs of contacts, movement clearance maximum between main contacts (4) and the active contact (7), the movement clearance minimum between resistance contact point (5) and the resistance moving contact (8); Opening and closing resistor (3) is fixedly mounted on the inside of resistance box (2), and be electrically connected with the arcing contact that is arranged in metal shell (1) (6) by lead one end, the other end is electrically connected with resistance contact point (5), also be provided with equalizing capacitance (10) in the metal shell (1), one end of equalizing capacitance (10) is electrically connected with opening and closing resistor (3) by lead, and the other end is electrically connected with moving contact by flexible conductor; Moving contact and operating mechanism are in transmission connection.
2, a kind of breaker in extra high voltage that is used for GIS according to claim 1, it is characterized in that: main contacts (4), resistance contact point (5) and arcing contact (6) all are actively plugged on the insulation guide plate (11), have the creepage skirt of annular projection on the insulation guide plate (11).
3, a kind of breaker in extra high voltage that is used for GIS according to claim 1, it is characterized in that: described opening and closing resistor (3) is that multilayer is around resistance, constitute by the multilayer resistance wire series connection that is looped around on the skeleton, and the adjacent two layers resistance wire is opposite around direction.
4, according to claim 1 or 2 or 3 described a kind of breaker in extra high voltage that are used for GIS, it is characterized in that: opening and closing resistor (3) comprises one-level resistance (3A) and secondary resistance (3B), Dui Ying resistance contact point (5) comprises one-level resistance contact point (5A), secondary resistance contact point (5B) with it, and resistance moving contact (8) comprises one-level resistance moving contact (8A) and secondary resistance moving contact (8B); Wherein, one-level resistance (3A) is electrically connected with one-level resistance contact point (5A), connects with secondary resistance (3B) in secondary resistance contact point (5B) and equalizing capacitance (10) back in parallel; Movement clearance between one-level resistance contact point (5A) and the one-level resistance moving contact (8A) is less than the movement clearance between secondary resistance contact point (5B) and the secondary resistance moving contact (8B).
5, a kind of breaker in extra high voltage that is used for GIS according to claim 4, it is characterized in that: the main contacts of fixed contact (4), resistance contact point (5) are connected with insulation guide plate (11) elasticity by spring respectively with arcing contact (6), main contacts (4) is electrically connected by flexible conductor with arcing contact (6), and the end of main contacts (4) is electrically connected with connecting rod (14) in fixedly being inserted into end casing (13); Elastic movement gap between main contacts (4) and the insulation guide plate (11) is less than the elastic movement gap between arcing contact (6) and the insulation guide plate (11); Elastic movement gap between resistance contact point (5) and the insulation guide plate (11) is greater than the elastic movement gap between arcing contact (6) and the insulation guide plate (11); The end of resistance contact point (5) is electrically connected with resistance binding post (15) in fixedly being inserted into end casing (13) by flexible conductor; The active contact (7) of moving contact, resistance moving contact (8) and arc extinguishing moving contact (9) all are actively plugged on the interior insulation support plate (16), external insulation supporting bracket (17) is installed in the metal shell (1) with interior insulation support plate (16) secured in parallel, and arc extinguishing moving contact (9) also is actively plugged in the external insulation supporting bracket (17) simultaneously; Be installed with conductive plate (18) on the arc extinguishing moving contact (9), conductive plate (18) is positioned between insulation support plate (16) and the external insulation supporting bracket (17); Initiatively contact (7) and resistance moving contact (8) link together by this conductive plate (18) and arc extinguishing moving contact (9), active contact (7), resistance moving contact (8), the position of arc extinguishing moving contact (9) respectively with main contacts (4), resistance contact point (5), arcing contact (6) is corresponding, interior insulation support plate (16) is gone up and resistance moving contact (8), the corresponding position of arc extinguishing moving contact (9) is provided with cylinder sleeve (19), resistance moving contact (8), the arc extinguishing moving contact has piston on (9), and form piston with the inwall of cylinder sleeve (19) and cooperate, the piston of arc extinguishing moving contact (9) and resistance moving contact (8) is provided with arc blow-out pipe (20), and arc blow-out pipe (20) runs through the piston on arc extinguishing moving contact (9) or the resistance moving contact (8); Have the exhaust outlet that unidirectional valve is installed on the piston; The end of arc extinguishing moving contact (9) has connecting plate (21).
6, a kind of breaker in extra high voltage that is used for GIS according to claim 4, it is characterized in that: the center fixed of resistance box (2) is installed connecting rod extension rod (28), opening and closing resistor (3) around be arranged on connecting rod extension rod (28) around, the top of connecting rod extension rod (28) is equipped with ratchet mechanism, this ratchet mechanism is connected with the connecting rod (14) that is fixedly mounted on the arcing contact (6), connecting rod (14) is gone up the position corresponding with ratchet mechanism and is had tooth bar, and the ratchet on the ratchet mechanism is installed in the tooth bar.
7, a kind of breaker in extra high voltage that is used for GIS according to claim 4, it is characterized in that: be respectively installed with cover (22) and the interior cover of arc extinguishing moving contact (23) in the resistance moving contact on resistance moving contact (8) and the arc extinguishing moving contact (9), overlap (23) in the resistance moving contact in cover (22) and the arc extinguishing moving contact and be positioned at cylinder sleeve (19), and be movably connected on the interior insulation support plate (16) by balancing spring.
8, a kind of breaker in extra high voltage that is used for GIS according to claim 4, it is characterized in that: moving contact is in transmission connection by transmission case and operating mechanism, this transmission case comprise transfer case (24) and with transfer case (24) support and connection cover connected vertically (25), the two ends of transfer case (24) are connected with the movable contact head end of two break contact devices respectively, and the stationary contact of these two break contact devices respectively connects a resistance box (2) that has opening and closing resistor (3); By the hinge symmetry two connecting levers (26) are installed in the transfer case (24), have on the connecting lever (26) two with pin joint constitute leg-of-mutton tie point, one of them tie point and moving contact are hinged, another tie point is connected on the pull bar (27), pull bar (27) is installed in the support and connection cover (25), and is connected with operating mechanism.
9, a kind of breaker in extra high voltage that is used for GIS according to claim 4, it is characterized in that: main contacts (4) has a plurality of, is looped around evenly distributing of arcing contact (6) on every side, and initiatively the quantity and the position of contact (7) are corresponding with main contacts (4).
CNB2006100699897A 2006-11-13 2006-11-13 Very high breaker in use for GIS Expired - Fee Related CN100454462C (en)

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CNB2006100699897A CN100454462C (en) 2006-11-13 2006-11-13 Very high breaker in use for GIS
PCT/CN2007/002300 WO2008058445A1 (en) 2006-11-13 2007-07-31 Super high voltage interrupter for gis

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CN100454462C true CN100454462C (en) 2009-01-21

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EP2188822B1 (en) 2007-09-10 2016-03-23 ABB Technology AG High voltage circuit breaker with a switch for connecting a closing resistor
CN102568910B (en) * 2011-12-20 2014-07-30 平高集团有限公司 1100kV extra-high voltage series complement bypass switch
DE102013210136A1 (en) * 2013-05-30 2014-12-04 Siemens Aktiengesellschaft Electrical switching device
CN104319168B (en) * 2014-10-09 2017-05-03 河南平高电气股份有限公司 Interrupter assembly and porcelain knob-type sulphur hexafluoride circuit breaker
CN104465203B (en) * 2014-12-04 2016-12-07 中国西电电气股份有限公司 A kind of primary cut-out actuating device

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