CN2829070Y

CN2829070Y - Four-pole multiplier-speed breaking contact superhigh-voltage circuit breaker

Info

Publication number: CN2829070Y
Application number: CN 200520127491
Authority: CN
Inventors: 王光顺
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-18
Filing date: 2005-10-18
Publication date: 2006-10-18
Anticipated expiration: 2015-10-18

Abstract

The utility model relates to a four-pole multiplier speed breaking contact for ultrahigh voltage circuit breaker used in power equipment, which has the structure that a fixed contact is designed to be connected with an insulating cylinder through a spring, when the breaking is started, the fixed contact moves with a moving contact under the action of friction and extends the spring, and the fixed contact suddenly separates from the moving contact when moving to the position of a dead center and generates relative multiplier speed move with the moving contact. The utility model has the advantages that the load current is great, the breaking power is high, the breaking capacity of a single break is increased by more than 40% compared with a flow transmission structure, and the performance requirement of an ultrahigh voltage circuit breaker can be met.

Description

Four pole multi speed disjunction contact of extra-high-voltage breaker

Technical field

The utility model relates to the four pole multi speed disjunction contact of extra-high-voltage breaker that a kind of power equipment uses.

Background technology

The power equipment switch all needs break contact, 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 speed is short more, and is more little to the infringement of equipment.In addition, long distance alive circuit non-loaded or that load is very little can form very high overvoltage in electrical network.If the special equipment of these overvoltage neither ones is limited, in high-voltage fence, will take the transition insulation measures so, and this will inevitably increase considerably cost.The effective way of over-voltage is exactly to come these circuit are switched with the circuit breaker that switching-on resistance is housed, and switching-on resistance can be limited in switching overvoltage a relatively low level.The existing primary cut-out contact that has switching-on resistance, FXT16D type SF6 contact of breaker with Alstom (China) company (ALSTOM) is representative, be made up of the moving contact and the fixed contact that are installed in the insulation cavity, fixed contact is fixedly mounted in the insulation cavity, is connected with switching-on resistance; Moving contact is hinged on the insulated tension pole, the speed of related movement of moving contact and fixed contact depends on the movement velocity of insulated tension pole, in order to improve the breaking speed of switch, has only the movement velocity that improves insulated tension pole, and this can increase substantially production cost power consumption then, the movement velocity of insulated tension pole can cause bigger motion impulsive force again after improving simultaneously, influences the useful life of equipment.Be difficult to reach the requirement of ultra high voltage large capcity breaker.

Summary of the invention

The purpose of this utility model provides a kind of reliable, with low cost, four pole multi speed disjunction contact of extra-high-voltage breaker that breaking speed is fast rational in infrastructure.

For achieving the above object, the utility model adopts following technical scheme:

Four pole multi speed disjunction contact of extra-high-voltage breaker described in the utility model comprises insulating cylinder and is arranged on fixed contact and moving contact in the insulating cylinder, be connected by spring between fixed contact and the insulating cylinder, the main contacts that has projection on the fixed contact, transition contacts and arcing contact, wherein, main contacts directly is electrically connected with transition contacts, and separate with insulating material between the arcing contact, the arcing contact directly is electrically connected with switching-on resistance and resistance short circuit moving contact, the other end of switching-on resistance connects resistance short circuit fixed contact by the fixed contact terminal, and is corresponding with resistance short circuit moving contact; On the inwall of the insulating cylinder between fixed contact and the moving contact, have the step that stops that is used to stop that fixed contact moves; Moving contact is installed in the insulating cylinder in mode in axial sliding, and have on the top of moving contact the arc extinguishing moving contact corresponding with the arcing contact, with the corresponding transition moving contact of transition contacts, the active contact corresponding with main contacts, the arc extinguishing moving contact is with the transition moving contact, initiatively the contact directly is electrically connected; Distance between arc extinguishing moving contact and the arcing contact is less than the distance between transition moving contact and the transition contacts, and the distance between transition moving contact and the transition contacts is less than the distance between active contact and the main contacts.

Above-mentioned fixed contact has the fixed contact base of plate-like, be fixedly mounted on the end of fixed contact conducting rod, be provided with fixed contact supporting bracket and moving contact supporting bracket in the insulating cylinder, the center of fixed contact supporting bracket has pilot hole, the fixed contact conducting rod is installed in this pilot hole, is installed with spring base on the fixed contact conducting rod, and spring is a stage clip, be sleeved on the fixed contact conducting rod, between spring base and fixed contact supporting bracket; Moving contact has the moving contact base of plate-like, and the moving contact base is fixedly mounted on the top of moving contact conducting rod, and the moving contact conducting rod is installed in the middle pilot hole of moving contact supporting bracket.

The arcing contact is arranged on the center of fixed contact base, the outside of arcing contact a plurality of transition contacts that distribute, the outside of transition contacts a plurality of main contactss that distribute; Correspondingly, the arc extinguishing moving contact is arranged on the center of moving contact base, the transition moving contact and initiatively the contact be arranged on the arc extinguishing moving contact around, have an exhaust outlet that runs through arc blow-out pipe wherein and unidirectional valve is installed on the moving contact base.

After adopting technique scheme, the utlity model has following advantage:

1, whole contact is installed in the insulating cylinder, and is simple and reliable for structure.Can be used for above GIS of superhigh pressure and circuit breaker.

2, contact branch, fashionable, the arcing time is short, and arc extinguishing speed is fast, can effectively increase the service life.

3, the load electric current is big, disjunction power height, the single break breaking capacity with spread the structure comparison and can improve more than 40%, can satisfy the performance requirement of breaker in extra high voltage.

4, separating brake power is low, can effectively reduce the operating mechanism volume, improves action sensitivity.

5, can effectively suppress switching overvoltage, reduce the system insulation cost.

6, calm the anger arc blow-out function and doubly fast disjunction function can effectively be improved arc extinguishing ability when disconnecting little electric current.

Description of drawings

Fig. 1 is the structural representation of an embodiment contact disjunction state of the present utility model;

Fig. 2 is the structural representation of contact closure state;

Structural representation when fixed contact moved to lower dead center when Fig. 3 was the contact disjunction.

Embodiment

As shown in drawings, four pole multi speed disjunction contact of extra-high-voltage breaker described in the utility model comprises insulating cylinder 7 and is arranged on fixed contact 3 and moving contact 14 in the insulating cylinder 7.Fixed contact 3 has the fixed contact base of plate-like, be fixedly mounted on the end of fixed contact conducting rod 10, be provided with fixing fixed contact supporting bracket 12 and moving contact supporting bracket 110 in the insulating cylinder 7, the center of fixed contact supporting bracket 12 has pilot hole, fixed contact conducting rod 10 is installed in this pilot hole, is installed with spring base 22 on the fixed contact conducting rod 10, and spring 2 is a stage clip, be sleeved on the fixed contact conducting rod 10, between spring base 22 and fixed contact supporting bracket 12; Moving contact 14 has the moving contact base of plate-like, and the moving contact base is fixedly mounted on the top of moving contact conducting rod 11, and moving contact conducting rod 11 is installed in the pilot hole of moving contact supporting bracket 110 centres.The main contacts 31, transition contacts 32 and the arcing contact 33 that have projection on the fixed contact 3, wherein, arcing contact 33 is arranged on the center of fixed contact base, the outer ring of arcing contact 33 is around a plurality of transition contacts 32 that distribute, the outer ring of transition contacts 32 is around a plurality of main contactss 31 that distribute, and arcing contact 33 is the longest, and transition contacts 32 is taken second place, and main contacts 31 is the shortest.

The fixed contact base is made of conductive metallic material, and the insulating tape that a ring-type is wherein arranged is divided into two parts between arcing contact 33 and transition contacts 32, and main contacts 31 is electrically connected with transition contacts 32, and separates with arcing contact 33; Main contacts 31 is connected on the electrode by metal guide post 39 and flexible conductor with transition contacts 32.Fixed contact conducting rod 10 is made of conductive metallic material equally, the other end at fixed contact conducting rod 10 connects switching-on resistance 35 by flexible conductor, arcing contact 33 is electrically connected with switching-on resistance 35, also is installed with resistance short circuit moving contact 34 on the fixed contact conducting rod 10 by discoid terminal pad.The other end of switching-on resistance 35 is connected on the electrode, also is electrically connected resistance short circuit fixed contact 36 by flexible conductor simultaneously, and resistance short circuit fixed contact 36 is fixed on by connecting plate on the inwall of insulating cylinder 7, position and the 34 corresponding installations of resistance short circuit moving contact.On the inwall of the insulating cylinder 7 between fixed contact 3 and the moving contact 14, have and be used to limit fixed contact 3 and stop step 21 to what moving contact 14 directions moved; Corresponding with fixed contact 3, on the moving contact base, have the arc extinguishing moving contact 143 corresponding with arcing contact 33, with the corresponding transition moving contact 142 of transition contacts 32, the active contact 141 corresponding with main contacts 31, arc extinguishing moving contact 143 is arranged on the center of moving contact base, transition moving contact 142 and initiatively contact 141 be arranged on arc extinguishing moving contact 143 around, the moving contact base adopts the metal of conduction to make, and arc extinguishing moving contact 143 is electrically connected with transition moving contact 142, active contact 141; In addition, on the moving contact base, have an exhaust outlet 41 that runs through arc blow-out pipe 4 wherein and unidirectional valve is installed.

Certainly, molecular sieve 71 devices such as grade can also be set in insulating cylinder 7.

Transition contacts 32 and arcing contact 33 adopt the high-temperature alloy material to make, and main contacts 31 and resistance short circuit moving contact 34, resistance short circuit fixed contact 36 adopt the alloy material of conductance height, good springiness to make.

As shown in Figure 1, contact is initially at the disjunction state, and fixed contact 3 is in top dead center position under the effect of spring 2, and resistance short circuit moving contact 34 separates with resistance short circuit fixed contact 36.

When feed motion begins, moving contact 14 moves up under the drive of driving mechanism, because the distance between arc extinguishing moving contact 143 and the arcing contact 33 is the shortest, at first produces electric arc between these two contacts, also be that arc extinguishing moving contact 143 and arcing contact 33 are connected earlier subsequently; At this moment, other contact is not all also connected, and electric current is realized connecting by fixed contact terminal 37, switching-on resistance 35, fixed contact conducting rod 10, arcing contact 33, arc extinguishing moving contact 143, moving contact conducting rod 11, moving contact terminal 38.

Moving contact 14 continues to move up, and transition moving contact 142 engaged with transition contacts 32 before this, and last initiatively contact 141 engages with main contacts 31, finishes feed motion, as shown in Figure 2.At this moment, electric current is by moving moving contact terminal 38, moving contact conducting rod 11, initiatively contact 141, main contacts 31, metal guide post 39, flexible conductor, the 37 realization connections of fixed contact terminal, and the back switching-on resistance 35 that closes a floodgate is inoperative.Transition moving contact 142 and transition 32 effects of connecting earlier of getting an electric shock are: in case under circuit closes a floodgate the situation of short circuit current, the two ends of switching-on resistance 35 can produce high voltage, can produce electric arc when closing on contact in the contact.Transition moving contact 142 and transition contacts 32 first connections can be with switching-on resistance 35 short circuits; only can between transition moving contact 142 and transition contacts 32, produce electric arc; avoid the main contacts of connecting subsequently 31 and initiatively produce electric arc between the contact 141, protection main contacts 31 and active contact 141.

As shown in Figure 3, during separating brake action beginning, moving contact 14 moves down under the drive of driving mechanism, fixed contact 3 produces frictional force and moves downward between moving contact under moving contact 14 each contact elastic force effect, the resistance short circuit moving contact 34 of fixed contact conducting rod 10 back engages with resistance short circuit fixed contact 36, main contacts 31 with before separate active contact 141 with switching-on resistance 35 short circuits.Meanwhile, spring 2 is compressed under the effect of fixed contact conducting rod 10, and when the lower end of fixed contact 3 moves to when stopping step 21 places, fixed contact 3 just no longer moves downward, and moving contact 14 continues to move downward.At first being that initiatively separate with main contacts 31 contact 141 afterwards, is that transition moving contact 142 separates with transition contacts 32 then, is that arc extinguishing moving contact 143 separates with arcing contact 33 at last, and produces electric arc.At this moment, when moving contact 14 continued to move downward fast, rapidly to motion in the other direction, behind arc extinction, resistance short circuit moving contact 34 separated with resistance short circuit fixed contact 36 fixed contact 3 under spring 2 effects.At this moment the speed of related movement between arc extinguishing moving contact 143 and the arcing contact 33 is higher than the movement velocity of moving contact 14 far away, reaches doubly speed.Thereby electric arc is extinguished at short notice.Arcing time, extinguishes back switch disjunction and finishes only by about 1 times of moving contact 14 decreased locomotion than simple, and fixed contact 3 resets simultaneously, and resistance short circuit moving contact 34 separates with resistance short circuit fixed contact 36, and is ready for close a floodgate next time.

When being used for gas-insulated switch, can realize that also self-produced gases at high pressure assist arc extinguishing, as shown in Figure 3, when moving contact 14 moves downward, the piston effect that the base of moving contact 14 forms produces gases at high pressure and sprays to the upper end of arc extinguishing moving contact 143 by arc blow-out pipe 4 in insulating cylinder 7, make electric arc when voltage zero-cross, extinguish, reduce temperature between arc extinguishing moving contact 143 and the arcing contact 33 rapidly, and the medium dielectric strength between enhancing arc extinguishing moving contact 143 and the arcing contact 33, make electric arc be difficult to resume combustion.In arc burning, be subjected to the high arc temperature effect in the inner chamber of moving contact 14, produce expanding gas and air blowing in arc control device 13, make electric arc produce vertical disjunction effect again.The high temperature that electric arc produces can also raise the pressure of whole arc control device 13, quickens to move upward thereby promote fixed contact 3, makes that breaking speed is further accelerated, the arcing time further shortens.When the pressure in the arc control device 13 was raised to certain pressure, pressure limiting valve was opened, and the overvoltage gas in the arc control device 13 is arranged to gas receiver 5 by molecular sieve 71.

When moving contact 14 moved upward, the gas in the arc control device 13 can enter in the inner chamber of moving contact 14 belows by unidirectional valve 6 again, avoids producing vacuum.

Claims

1, four pole multi speed disjunction contact of extra-high-voltage breaker, comprise insulating cylinder (7) and be arranged on fixed contact (3) and moving contact (14) in the insulating cylinder (7), it is characterized in that: be connected by spring (2) between fixed contact (3) and the insulating cylinder (7), the main contacts (31) that has projection on the fixed contact (3), transition contacts (32) and arcing contact (33), wherein, main contacts (31) directly is electrically connected with transition contacts (32), and separate with insulating material between (33) arcing contact, arcing contact (33) directly is electrically connected with switching-on resistance (35) and resistance short circuit moving contact (34), the other end of switching-on resistance (35) connects resistance short circuit fixed contact (36) by fixed contact terminal (37), and is corresponding with resistance short circuit moving contact (34); On the inwall of the insulating cylinder (7) between fixed contact (3) and the moving contact (14), have and be used to stop that fixed contact (3) moves stops step (21); Moving contact (14) is installed in the insulating cylinder (7) in mode in axial sliding, and have on the top of moving contact (14) the arc extinguishing moving contact (143) corresponding with arcing contact (33), with the corresponding transition moving contact (142) of transition contacts (32), the active contact (141) corresponding with main contacts (31), arc extinguishing moving contact (143) and transition moving contact (142), initiatively contact (141) directly be electrically connected; Distance between arc extinguishing moving contact (143) and arcing contact (33) is less than the distance between transition moving contact (142) and the transition contacts (32), and the distance between transition moving contact (142) and the transition contacts (32) is less than the distance between active contact (141) and the main contacts (31).

2, four pole multi speed disjunction contact of extra-high-voltage breaker according to claim 1, it is characterized in that: fixed contact (3) has the fixed contact base of plate-like, be fixedly mounted on the end of fixed contact conducting rod (10), be provided with fixed contact supporting bracket (12) and moving contact supporting bracket (110) in the insulating cylinder (7), the center of fixed contact supporting bracket (12) has pilot hole, fixed contact conducting rod (10) is installed in this pilot hole, be installed with spring base (22) on the fixed contact conducting rod (10), spring (2) is a stage clip, be sleeved on the fixed contact conducting rod (10), be positioned between spring base (22) and the fixed contact supporting bracket (12); Moving contact (14) has the moving contact base of plate-like, and the moving contact base is fixedly mounted on the top of moving contact conducting rod (11), and moving contact conducting rod (11) is installed in the middle pilot hole of moving contact supporting bracket (110).

3, four pole multi speed disjunction contact of extra-high-voltage breaker according to claim 2, it is characterized in that: arcing contact (33) are arranged on the center of fixed contact base, the outside of arcing contact (33) a plurality of transition contacts (32) that distribute, the outside of transition contacts (32) a plurality of main contactss (31) that distribute; Correspondingly, arc extinguishing moving contact (143) is arranged on the center of moving contact base, cross fluctuation contact (142) and initiatively contact (141) be arranged on arc extinguishing moving contact (143) around, have an exhaust outlet (41) that runs through arc blow-out pipe (4) wherein and unidirectional valve (6) are installed on the moving contact base.