Double-break vacuum circuit breaker

Abstract

The utility model relates to a double-break vacuum circuit breaker, which comprises three electrical devices which are arranged in a cross beam and correspond to three phases, fifth crank arms which are hinged with opening springs of the electrical devices and are hinged on the cross beam, and interphase connecting rods which are hinged with the three fifth crank arms, the cross beam is provided with a three-phase body arranged corresponding to the three electrical equipment, the three-phase body is internally provided with two vacuum arc-extinguishing chambers arranged along the height direction, and the fifth crank arm is synchronously connected with movable side guide rods of the two vacuum arc-extinguishing chambers through an external connecting rod structure. According to the utility model, the two vacuum arc-extinguishing chambers are arranged along the height direction, the current T-shaped arrangement is changed, the fifth crank arm is driven to act through the mechanism box, and the movable side guide rods of the vacuum arc-extinguishing chambers are synchronously driven to act while the fifth crank arm is matched with the opening spring, so that closing and opening can be realized, electrical appliance interlocking is replaced by mechanical interlocking, the structure is simplified, and the cost is reduced. The adjustment is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of circuit breaker, especially to the field of double-break circuit breaker, and specifically relates to a double-break vacuum circuit breaker. BACKGROUND

[0002] In the power system, the two most basic and important indicators of power quality are voltage and frequency, among which the frequency is affected by active power, and the voltage can be controlled by reactive power.

[0003] With large-scale access of new energy, the scale and complexity of the power grid are increasing, in order to ensure the stable, safe and economic operation of the power grid and the high-quality power supply of users, the current capacitor is used for reactive power compensation to improve the power factor, which can not only reduce the active loss of the power grid, but also reduce the reactive consumption of the power grid, and at the same time, it can improve the capacity utilization of the transformer and power line and reduce the voltage drop, which is a widely used power-saving measure. The capacitor bank is widely used due to its low price, simple operation equipment and obvious effect, and the capacitor bank is switched at a high frequency and has high reliability requirements, which can avoid inrush current and overvoltage problems, but is easy to cause damage to the capacitor and the circuit breaker.

[0004] The prior art needs to operate the capacitor bank, and the current switching device is generally an old single-break switch, mainly using SF6 or silicon oil insulation, and has a relatively fixed structure and lacks flexibility and adjustability. The single-break switch needs frequent maintenance, has poor environmental protection, and has low safety redundancy compared with the double-break design. Moreover, the existing switching operation involves a transmission system with poor insulation rod sealing, which can easily allow moisture in the environment to enter the device body, affect the ground insulation, and cause internal components to be corroded by moisture, directly reducing the reliability of the switching operation. How to optimize the design and application of the double-break vacuum switch and improve the environmental protection and reliability is a technical problem to be solved at present.

[0005] The existing double-break circuit breaker is mostly T-shaped or open, uses electrical interlocking, has high cost, complex transmission structure, and is not convenient for adjustment and maintenance. UTILITY MODEL CONTENTS

[0006] The utility model discloses a double-break vacuum circuit breaker, which uses mechanical interlocking instead of electrical interlocking, changes the T-shaped arrangement, simplifies the structure, facilitates adjustment and maintenance, integrates a current transformer, has high integration, saves space, and has low cost.

[0007] The utility model discloses a kind of double-break vacuum circuit breakers, including three electrical equipment corresponding three-phase being arranged in crossbeam, and fifth crank arm being hinged with electrical equipment opening spring hinge and being hinged on crossbeam, and with three fifth crank arm all hinge interphase connecting rod, the side of crossbeam is additionally provided with the mechanism box of driving interphase connecting rod stretch opening spring, crossbeam is provided with three-phase body corresponding three electrical equipment, two vacuum interrupters along height direction are arranged in three-phase body, and fifth crank arm is connected with the dynamic side guide rod of two vacuum interrupters through external connecting rod structure.

[0008] The utility model discloses when using, through the setting of two vacuum interrupters along height direction arrangement, change current T type arrangement, drive fifth crank arm action with mechanism box, cooperate with opening spring, simultaneously, synchronous drive vacuum interrupter dynamic side guide rod action, to be able to realize closing and opening, to use mechanical interlock instead of electrical interlock, simplify structure, it is convenient to adjust, through the setting of external connecting rod structure, circuit breaker is convenient to adjust characteristic parameter, it is convenient to maintain and maintenance, equipment structure is compact in the present scheme, it is convenient to whole machine transportation, direct hoisting installation on site.

[0009] As preferred, the body includes two circuit breaking sleeves arranged along the height direction, the circuit breaking sleeve includes an upper connection plate, a vacuum interrupter and a middle support arranged in sequence from top to bottom, the middle support of the upper circuit breaking sleeve is connected with the upper connection plate of the lower circuit breaking sleeve, a voltage-sharing capacitor is further arranged between the upper connection plate and the middle support on the side of the vacuum interrupter, the middle support further has the dynamic side guide rod connected with the connecting rod structure, the dynamic side guide rod is connected with the dynamic side of the vacuum interrupter through a conductive clamp, the crossbeam further has a support column sleeve connected with the lower circuit breaking sleeve, the corresponding electrical equipment is connected with the middle support of the lower circuit breaking sleeve through a copper bar, and the middle support is connected with the conductive clamp of the corresponding vacuum interrupter through a flexible connection.

[0010] The preferred scheme facilitates the support of the two vacuum interrupters through the support column sleeve, and improves the reliability of the equipment through the arrangement of the voltage-sharing capacitor; meanwhile, the voltage-sharing capacitor can be placed on either side of the vacuum circuit breaker, so that the installation position of the voltage-sharing capacitor can be adjusted according to the actual installation condition.

[0011] As preferred, the connecting rod structure includes a second insulating pull rod extending upward and hingedly connected to the fifth crank arm at the bottom end, the top end of the second insulating pull rod is connected with a first insulating pull rod, the first insulating pull rod and the second insulating pull rod correspond to two circuit breaking sleeves, the second insulating pull rod is hingedly connected with a third crank arm, the third crank arm is coaxially arranged with a fourth crank arm, and the fourth crank arm is fixedly connected with a pin shaft inserted into the corresponding dynamic side guide rod; the first insulating pull rod is hingedly connected with a first crank arm, the first crank arm is coaxially arranged with a second crank arm, and the second crank arm is fixedly connected with a corresponding pin shaft inserted into the corresponding dynamic side guide rod.

[0012] In use, the rotation of the fifth crank arm drives the first and second insulated pull rods to move in the same direction, thereby driving the first and third crank arms to rotate in the same direction synchronously, and then driving the second and fourth crank arms to rotate, thereby driving the two movable side guide rods to move in the same direction, so as to simultaneously realize the closing and opening of the two vacuum interrupters.

[0013] Preferably, a lower connection plate is further arranged between the lower middle support and the support sleeve, the lower connection plate is internally provided with a second oil buffer for the impact of the movable side guide rod during opening, and the upper middle support is internally provided with a first oil buffer for the impact of the upper movable side guide rod during opening, and the first oil buffer extends into the upper connection plate below.

[0014] The preferred arrangement is convenient for buffering the impact of the movable side guide rod through the arrangement of the oil buffer.

[0015] Preferably, the electrical equipment comprises a current transformer.

[0016] Preferably, a cylindrical rain cover is fixed to the circumferential surface of the second insulated pull rod, and a rubber insulating pad is arranged between the lower middle support and the lower connection plate.

[0017] The preferred arrangement forms a rainproof structure through the arrangement of the rain cover, and ensures high-potential isolation through the arrangement of the rubber insulating pad, thereby facilitating the series connection of the current transformer.

[0018] Preferably, the upper connection plate is a cast part, and the static side of the vacuum interrupter is connected and fixed to the upper connection plate through bolts. The arrangement of the preferred arrangement ensures the strength of the upper connection plate.

[0019] Preferably, the middle support is further provided with a guide plate for the movement of the movable side guide rod in the height direction, and the guide plate is provided with a long hole extending in the height direction for the passage of the pin shaft.

[0020] The preferred arrangement gives the pin shaft a guiding effect through the arrangement of the guide plate and the long hole.

[0021] Preferably, the mechanism box is connected to the cross beam through bolts, and the mechanism box is internally provided with a mechanism output rod for driving the inter-phase connecting rod to move in the horizontal direction. The preferred arrangement is convenient for integrated connection, thereby facilitating the overall loading and transportation.

[0022] The utility model discloses a beneficial effect is: through the setting of two vacuum interrupters along the height direction arrangement, change current T type arrangement, have the layout advantage, convenient maintenance and characteristic adjustment, convenient circuit breaker phase -to -phase synchronization and single -phase inside two break -open period adjustment, compact structure, through the mechanism box drive fifth elbow arm action, with the break spring cooperation simultaneously, synchronous drive vacuum interrupter dynamic side guide rod action to can realize the break -in and break -out, thereby using mechanical interlock instead of electrical interlock, three -phase mechanical linkage, single -agency power source, high reliability, relative with electrical interlock cost is low, no non - full - phase action control cabinet, save the site space, through the setting of external connecting rod structure, circuit breaker is convenient to adjust characteristic parameter, convenient maintenance and characteristic adjustment, the equipment structure compact in the scheme, convenient whole machine transportation, directly hoist installation on the spot, through the setting of support bushing, it is convenient for supporting two vacuum interrupters, through the setting of grading capacitor, avoid appearing and the overvoltage of inrush current lead to capacitor and circuit breaker damage situation, improve power grid equipment reliability, even capacitor of double -break integrated, grading capacitor installation position is flexible, improve the break -open unbalanced voltage, limit recovery voltage amplitude, improve the arc -extinction ability, protect capacitor and circuit breaker, rich configuration, improve equipment reliability, through the setting of integration, equipment whole machine volume is small, provide monitoring, measurement and protection function for power grid equipment, the degree of integration is high, ensure that power grid system stable operation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is structural schematic diagram of the utility model;

[0024] Figure 2 It is inside schematic diagram of crossbeam;

[0025] Figure 3 It is side view schematic diagram of the body;

[0026] Figure 4 It is Figure 3 It is enlarged schematic diagram in A place of the body;

[0027] Figure 5 It is Figure 3 It is enlarged schematic diagram in B place of the body;

[0028] Figure 6 It is schematic diagram in guide plate place;

[0029] Figure 7 It is prior art schematic diagram;

[0030] The shown in the drawing:

[0031] 1, the first crank, 2, the second crank, 3, the third crank, 4, the fourth crank, 5, the fifth crank, 6, the current transformer, 7, the interphase connecting rod, 8, the mechanism box, 9, the third rotating shaft, 10, the first rotating shaft, 11, the first insulating pull rod, 12, the second insulating pull rod, 13, the voltage-sharing capacitor, 14, the upper terminal board, 15, the vacuum interrupter, 16, the middle support, 17, the lower terminal board, 18, the guide plate, 19, the contact spring, 20, the copper bar, 21, the second oil buffer, 22, the first oil buffer, 23, the conducting clamp, 24, the moving side guide rod, 25, the opening spring, 26, the flexible connection, 27, the rain cover. DETAILED DESCRIPTION

[0032] In order to clearly illustrate the technical features of the scheme, the following through specific embodiments, on the scheme is described.

[0033] Referring to the accompanying Figures 1-7 The utility model discloses a double-break vacuum circuit breaker, including setting in the beam and corresponding three-phase three current transformers 6, with the current transformer 6 opening spring 25 hinged and hinged on the beam fifth crank 5, and with three fifth crank 5 hinge interphase connecting rod 7, the side of beam still is equipped with with driving interphase connecting rod 7 mechanism box 8 that stretches opening spring, is equipped with with three three-phase body corresponding setting on the beam, three-phase body is equipped with with two along the height direction arrangement vacuum interrupter 15, fifth crank 5 is connected with two vacuum interrupter 15's moving side guide rod 24 synchronous through the external connecting rod structure.

[0034] The body includes two along the height direction arrangement circuit breaker bushing, the circuit breaker bushing includes the upper terminal board, vacuum interrupter 15, middle support 16 that are sequentially set from top to bottom, the middle support 16 of upper circuit breaker bushing is connected with the upper terminal board of lower circuit breaker bushing, still be equipped with with voltage-sharing capacitor 13 in vacuum interrupter 15 side between upper terminal board and middle support 16, still be equipped with with the moving side guide rod 24 of connecting rod structure connection in middle support 16, the moving side guide rod 24 is connected with vacuum interrupter 15's moving side through conducting clamp 23, still be equipped with with the column sleeve pipe of supporting lower circuit breaker bushing on the beam, corresponding current transformer 6 is connected with the middle support 16 of lower circuit breaker bushing through copper bar 20, the middle support 16 is connected with corresponding vacuum interrupter 15's conducting clamp 23 through flexible connection.

[0035] The connecting rod structure comprises a second insulating pull rod 12 extending upward and hinged at the bottom end to the fifth crank arm 5, a first insulating pull rod 11 connected to the top end of the second insulating pull rod 12, the first insulating pull rod 11 and the second insulating pull rod 12 corresponding to two circuit breaking bushings respectively, a third crank arm 3 hinged to the second insulating pull rod 12, the third crank arm 3 coaxially arranged with the fourth crank arm 4, and a pin shaft inserted into the corresponding moving side guide rod 24 fixed to the fourth crank arm 4; a first crank arm 1 hinged to the first insulating pull rod 11, the first crank arm 1 coaxially arranged with a second crank arm 2, and a corresponding pin shaft inserted into the corresponding moving side guide rod 24 fixed to the second crank arm 2.

[0036] The third rotating shaft 9 is hinged in the lower middle support 16, the third crank arm 3 and the fourth crank arm 4 are connected to the third rotating shaft 9, the rotation of the third crank arm 3 drives the third rotating shaft 9 to rotate, and the third rotating shaft 9 rotates to drive the fourth crank arm 4 to rotate; the first rotating shaft 10 is hinged in the upper middle support 16, the first crank arm 1 and the second crank arm 2 are connected to the first rotating shaft 10, the rotation of the first crank arm 1 drives the first rotating shaft 10 to rotate, and the first rotating shaft 10 rotates to drive the second crank arm 2 to rotate.

[0037] The lower connection board 17 is further arranged between the lower middle support 16 and the support bushing, the second oil buffer 21 for the moving side guide rod 24 to impact is arranged in the lower connection board 17, the first oil buffer 22 for the upper moving side guide rod 24 to impact is arranged in the upper middle support 16, and the first oil buffer 22 extends into the upper connection board 14 below.

[0038] The circumferential surface of the second insulating pull rod 12 is fixedly connected with a cylindrical rain cover 27, the rubber insulating pad is arranged between the lower middle support and the lower connection board, the high potential isolation is ensured, thereby facilitating the series connection of the current transformers, the upper middle support and the lower upper connection board are at the same potential, and therefore the rubber insulating pad does not need to be arranged.

[0039] The upper connection board is a cast part, and the static side of the vacuum arc-extinguishing chamber 15 is connected and fixed to the upper connection board through bolts.

[0040] The guiding plate 18 for the moving side guide rod 24 to move in the height direction is further arranged in the middle support 16, and the long hole for the pin shaft to pass through is arranged in the guiding plate 18 and extends in the height direction.

[0041] The mechanism box 8 is connected to the cross beam through bolts, and the mechanism output rod for driving the inter-phase connecting rod to move in the horizontal direction is arranged in the mechanism box. The mechanism box 8 comprises a spring operating mechanism and is a prior art.

[0042] In particular, in order to facilitate understanding, due to the arrangement of the two circuit breaking bushings, in order to distinguish the circuit breaking bushings, according to the different positions, the circuit breaking bushings are described as the upper circuit breaking bushing and the lower circuit breaking bushing, and the upper connection board, the vacuum arc-extinguishing chamber 15 and the middle support 16 are also the same.

[0043] A transmission control method of a double-break vacuum circuit breaker, comprising the following steps:

[0044] The output rod of the mechanism box 8 is connected with the fifth crank arm 5, the fifth crank arm 5 is connected with the phase-to-phase connecting rod 7 and the second insulation pull rod 12 respectively, the second insulation pull rod 12 is connected with the third crank arm 3, the third crank arm 3 drives the fourth crank arm 4 to act through shaft transmission, the crank arm drives the moving side guide rod 24 to move along the height direction through the pin shaft;

[0045] When closing, the output rod of the mechanism box 8 moves horizontally to the right, the fifth crank arm 5 rotates counterclockwise, drives the phase-to-phase connecting rod 7 to move to the right, at the same time, stores energy for the three opening springs 25, the fifth crank arm 5 drives the first and second insulation pull rods 12 to move downward at the same time, thereby drives the first and third crank arms 1 and 3 to move clockwise, the first and third crank arms 1 and 3 respectively drives the second and fourth crank arms 2 and 4 to move clockwise, thereby drives the moving side guide rod 24 to move upward, thereby realizes the closing of the two vacuum arc-extinguishing chambers 15.

[0046] When opening, the tripping mechanism in the mechanism box 8 is unlocked, the energy of the opening spring 25 is released, drives the fifth crank arm 5 to move clockwise, the fifth crank arm 5 drives the first and second insulation pull rods 12 to move upward at the same time, thereby drives the first and third crank arms 1 and 3 to move counterclockwise, the first and third crank arms 1 and 3 respectively drives the second and fourth crank arms 2 and 4 to move counterclockwise, thereby drives the moving side guide rod 24 to move downward, thereby realizes the closing of the two vacuum arc-extinguishing chambers 15.

[0047] The utility model discloses a compact structure, and the two vacuum interrupters are arranged along the height direction, and the current T-shaped arrangement is changed, and the layout advantage is provided, and the maintenance and characteristic adjustment are facilitated, and the circuit breaker phase interval and single-phase two break intervals are adjusted conveniently, and the structure is compact, and the fifth crank arm is driven by the mechanism box, and the vacuum interrupter dynamic side guide rod is driven synchronously when the opening spring is cooperated, thereby realizing the closing and opening, and the mechanical interlock is used to replace the electrical interlock, three-phase mechanical linkage, single mechanism power source, high reliability, low cost compared with the electrical interlock, no full-phase action control cabinet, saves the site space, and the external connecting rod structure is arranged, and the circuit breaker is adjusted conveniently, and the maintenance and characteristic adjustment are facilitated, the equipment structure is compact in the scheme, and the whole machine transportation is facilitated, and the on-site direct hoisting installation is installed, and the support sleeve pipe is arranged, and the two vacuum interrupters are supported conveniently, and the equalizing capacitor is arranged, and the capacitor and circuit breaker damage caused by the inrush current and overvoltage are avoided, the power grid equipment reliability is improved, the uniform capacitor of double-break integrated, the equalizing capacitor installation position is flexible, the break imbalance voltage is improved, the recovery voltage amplitude is limited, the arc extinguishing capacity is improved, the capacitor and circuit breaker are protected, the configuration is rich, and the equipment reliability is improved, and the integrated setting is arranged, the equipment whole machine volume is small, the monitoring, measurement and protection functions are provided for the power grid equipment, the integration degree is high, and the power grid system stable operation is ensured

[0048] Of course, the above description is not limited to the above examples, and the technical features not described in the utility model can be realized by or using the prior art, which will not be repeated here; the above embodiments and drawings are only used to illustrate the technical scheme of the utility model and are not limited to the utility model, and the preferred embodiments are described in detail, and those skilled in the art should understand that the changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the utility model do not deviate from the purpose of the utility model, and should also belong to the protection scope of the claims of the utility model.

Claims

1. A double-break vacuum circuit breaker, characterized by: The mechanism includes three electrical devices arranged in the crossbeam and corresponding to three phases, a fifth crank (5) hinged with the opening spring (25) of the electrical device and hinged on the crossbeam, and an inter-phase connecting rod (7) hinged with the three fifth cranks (5), and the side of the crossbeam is further provided with a mechanism box (8) for driving the inter-phase connecting rod (7) to stretch the opening spring, and the crossbeam is provided with three-phase bodies corresponding to the three electrical devices, and the three-phase bodies are provided with two vacuum interrupters (15) arranged along the height direction, and the fifth crank (5) is connected with the moving side guide rod (24) of the two vacuum interrupters (15) through an external connecting rod structure.

2. The double-break vacuum circuit breaker according to claim 1, characterized in that: The body includes two circuit breaking bushings arranged along the height direction, and the circuit breaking bushing includes an upper terminal block (14), a vacuum interrupter (15), and a middle support (16) arranged in sequence from top to bottom, the middle support (16) of the upper circuit breaking bushing is connected with the upper terminal block of the lower circuit breaking bushing, and a voltage equalizing capacitor (13) is further arranged between the upper terminal block and the middle support (16) on the side of the vacuum interrupter (15), and the middle support (16) is further provided with the moving side guide rod (24) connected with the connecting rod structure, the moving side guide rod (24) is connected with the moving side of the vacuum interrupter (15) through a conductive clamp (23), and the crossbeam is further connected with a support column bushing supporting the lower circuit breaking bushing, and the corresponding electrical device is connected with the middle support (16) of the lower circuit breaking bushing through a copper bar (20), and the middle support (16) is connected with the conductive clamp (23) of the corresponding vacuum interrupter (15) through a flexible connection.

3. The double-break vacuum circuit breaker according to claim 2, characterized in that: The connecting rod structure includes a second insulating pull rod (12) extending upward and hinged at the bottom end of the fifth crank (5), the top end of the second insulating pull rod (12) is connected with a first insulating pull rod (11), the first insulating pull rod (11) and the second insulating pull rod (12) correspond to two circuit breaking bushings, a third crank (3) is hinged on the second insulating pull rod (12), the third crank (3) is coaxially arranged with a fourth crank (4), and a pin shaft is fixedly connected on the fourth crank (4) and inserted into the corresponding moving side guide rod (24); a first crank (1) is hinged on the first insulating pull rod (11), the first crank (1) is coaxially arranged with a second crank (2), and a corresponding pin shaft is fixedly connected on the second crank (2) and inserted into the corresponding moving side guide rod (24).

4. The double-break vacuum circuit breaker according to claim 3, characterized in that: A lower terminal block (17) is further arranged between the lower middle support (16) and the support column bushing, the lower terminal block (17) is provided with a second oil buffer (21) for the opening impact of the moving side guide rod (24), and the upper middle support (16) is provided with a first oil buffer (22) for the opening impact of the upper moving side guide rod (24), and the first oil buffer (22) extends into the lower upper terminal block (14).

5. The double-break vacuum circuit breaker according to claim 3, characterized in that: The electrical device includes a current transformer (6).

6. The double-break vacuum circuit breaker according to claim 4, characterized in that: A cylindrical rain cover (27) is fixedly connected on the circumferential surface of the second insulating pull rod (12), and a rubber insulating pad is arranged between the lower middle support and the lower terminal block.

7. The double-break vacuum circuit breaker according to claim 1, characterized in that: The upper terminal block is a cast part, and the static side of the vacuum interrupter (15) is connected and fixed with the upper terminal block through bolts.

8. The double-break vacuum circuit breaker according to claim 1, characterized in that: The middle support (16) is further provided with a guide plate (18) for moving the movable guide rod (24) in the height direction, and the guide plate (18) is provided with a long hole extending in the height direction for the pin shaft to pass through.

9. The double-break vacuum circuit breaker according to claim 1, characterized in that: The mechanism box (8) is connected to the cross beam by bolts, and the mechanism box is provided with a mechanism output rod for driving the inter-phase connecting rod to act and move horizontally.

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