Lifting type mechanical interlocking system of gas-insulated switchgear

Abstract

The utility model discloses a lifting type mechanical interlocking system of a gas insulated switchgear, which belongs to the technical field of insulated switches and comprises a three-position interlocking mechanism and a circuit breaker interlocking mechanism which are mounted in a mechanism compartment, and a chamber door interlocking mechanism mounted in a cable compartment. Wherein the three-station interlocking mechanism, the circuit breaker interlocking mechanism and the chamber door interlocking mechanism are sequentially distributed from top to bottom and are mechanically linked in pairs; the three-station interlocking mechanism and the circuit breaker interlocking mechanism are respectively connected with a three-station isolating switch and a circuit breaker in the inflation compartment; a cable chamber door is installed behind the cable compartment cabinet, and the chamber door interlocking mechanism is connected with the cable chamber door. Through the design of the three-position isolating switch, the circuit breaker switch and the high-voltage cable chamber door interlocking mechanism, the occurrence of manual misoperation is avoided, the phenomenon that a high-voltage electrified interval is mistakenly entered in the maintenance process is avoided, and the defects of the existing interlocking of the existing gas insulated switchgear are made up.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of insulation switch, concretely is a kind of inflatable cabinet lifting mechanical interlocking system. BACKGROUND

[0002] Inflatable cabinet refers to gas insulated metal enclosed switchgear, which adopts modular design, compact structure and small volume, saves land area, and is more suitable for narrow space environment. High protection level, stable operation in condensation, pollution, salt fog and other harsh environments. The high-voltage components inside the inflatable cabinet are enclosed in insulating gas, reducing the influence of the external environment on the equipment, so the equipment has high reliability, small maintenance workload and can meet the demand of power grid for high reliability and frequent operation. Due to the above advantages, the inflatable cabinet can be used for protection, control and monitoring in power plant, substation, high-rise building, industrial and mining enterprise, subway and other power distribution systems, especially suitable for harsh environmental conditions such as high humidity, high altitude and pollution, and widely used in power system.

[0003] At present, medium voltage distribution switch cabinet itself should have five prevention functions of "preventing misoperation of circuit breaker, preventing closing and opening of isolating switch with load, preventing closing and opening of grounding switch with electric, preventing power supply with grounding switch, and preventing entering live interval" while meeting the requirements of national standard. For the function of "preventing entering live interval", it is required that the high-voltage compartment door can be opened only after grounding the high-voltage compartment, and it is also required that the grounding switch can be operated only after closing the high-voltage compartment door. The existing inflatable cabinet product lacks mechanical locking between three-position isolating switch, circuit breaker switch and cable chamber door. Because there is no interlocking protection of the three, the cable chamber is easily charged by the arbitrary operation of site maintenance and construction personnel, which is easy to endanger personal safety. INVENTION CONTENTS

[0004] The technical problem to be solved by the utility model is to provide an inflatable cabinet lifting mechanical interlocking system, which avoids human error operation, avoids entering high-voltage live interval during maintenance process, and makes up for the deficiency of existing interlocking of current inflatable cabinet.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] An inflatable cabinet lifting mechanical interlocking system, the inflatable cabinet includes inflatable part and non-inflatable part;

[0007] The inflatable part includes inflatable compartment; three-position isolating switch and circuit breaker are installed in the inflatable compartment;

[0008] The non-inflatable part comprises a mechanism compartment and a cable compartment, wherein the cable compartment is distributed below the mechanism compartment; the non-inflatable part further comprises an instrument compartment, a busbar compartment and a pressure relief channel, wherein the instrument compartment is located above the mechanism compartment, and the busbar compartment and the pressure relief channel are respectively located above and beside the inflatable compartment;

[0009] The pull-out mechanical interlocking system comprises a three-position interlocking mechanism and a circuit breaker interlocking mechanism installed in the mechanism compartment, and a door interlocking mechanism installed in the cable compartment; wherein the three-position interlocking mechanism, the circuit breaker interlocking mechanism and the door interlocking mechanism are sequentially distributed from top to bottom and mechanically linked with each other.

[0010] The three-position interlocking mechanism and the circuit breaker interlocking mechanism are respectively connected with the three-position disconnector and the circuit breaker in the inflatable compartment; a cable door is hingedly installed at the back of the cable compartment, and the door interlocking mechanism is connected with the cable door.

[0011] As a preferred embodiment of the pull-out mechanical interlocking system of the inflatable cabinet, the door interlocking mechanism comprises an L-shaped interlocking plate one, a steel wire rope fixing connector, an electromagnetic lock baffle, an electromagnetic lock, a door interlocking rod, a C-shaped interlocking plate, an I-shaped interlocking plate one, an L-shaped interlocking plate two, a reverse interlocking plate and an I-shaped interlocking plate two.

[0012] The L-shaped interlocking plate one is fixed to the crossbeam of the cable chamber through the steel wire rope fixing connector, and is connected with the electromagnetic lock baffle through the installation hole; the C-shaped interlocking plate is fixedly installed on the cable door and is provided with a lock rod guide hole; the I-shaped interlocking plate one is installed on the L-shaped interlocking plate two, and the L-shaped interlocking plate two is provided with a rivet nut hole and is installed on the cable door; the reverse interlocking plate is connected to the middle plate of the L-shaped interlocking plate one through an inner hexagonal bolt and a lock nut, one end of the reverse interlocking plate is welded and fixed with the I-shaped interlocking plate two, and the other end of the reverse interlocking plate is inserted into the guide groove of the side plate of the L-shaped interlocking plate one.

[0013] As a preferred embodiment of the pull-out mechanical interlocking system of the inflatable cabinet, the steel wire rope fixing connector is fixed to the crossbeam of the cable chamber and also fixes the steel wire rope skin.

[0014] As a preferred embodiment of the pull-out mechanical interlocking system of the inflatable cabinet, the door interlocking rod is composed of a lock rod and a round pipe head.

[0015] As a preferred embodiment of the pull-out mechanical interlocking system of the inflatable cabinet, a long circular hole is provided on the I-shaped interlocking plate one for adjusting the front and rear distance, and the diameter of the long circular hole is 3-5mm.

[0016] As a preferred embodiment of the pull-out mechanical interlocking system of the inflatable cabinet, the three-position interlocking mechanism is provided with an interlocking block one installed on the transmission shaft of the three-position disconnector, and the interlocking block one is fixedly installed with an interlocking block two.

[0017] As a preferred embodiment of the mechanical interlocking system of the gas-filled cabinet, the circuit breaker interlocking mechanism comprises a circuit breaker interlocking part and a circuit breaker reverse interlocking part;

[0018] The circuit breaker interlocking part is provided with a circuit breaker interlocking rod and a circuit breaker crank arm, and the lower end of the circuit breaker interlocking rod is welded with a circular wire pressing plate for fixing the steel wire rope and is connected to the circuit breaker crank arm through screw thread;

[0019] The circuit breaker reverse interlocking part is provided with an I-shaped interlocking plate three, an I-shaped interlocking plate four and a Z-shaped interlocking plate, the I-shaped interlocking plate three is fixed on the circuit breaker mechanism through bolts and is used for guiding and spring fixing of the I-shaped interlocking plate four, one end of the Z-shaped interlocking plate is fixed on the compartment bottom plate of the mechanism, the other end of the Z-shaped interlocking plate is provided with a guide groove for guiding the up and down movement of the I-shaped interlocking plate four, one end of the I-shaped interlocking plate four is provided with a round hole for connecting an open pin to fix the spring, and the other end of the I-shaped interlocking plate four is connected with the steel wire rope.

[0020] As a preferred embodiment of the mechanical interlocking system of the gas-filled cabinet, the two room door interlocking rods in the room door interlocking mechanism are connected with the circuit breaker interlocking rod of the circuit breaker interlocking part and the interlocking block two in the three-position interlocking mechanism through the steel wire rope.

[0021] After the above technical scheme is adopted, the utility model has the beneficial effects that:

[0022] 1. In order to avoid entering the high-voltage live interval by mistake during the maintenance process, when the circuit breaker is in the open state and the three-position is in the isolation position, the cable chamber door cannot be opened at this time, which can effectively avoid entering the high-voltage live interval by mistake during the maintenance process.

[0023] 2. In order to avoid entering the high-voltage live interval by mistake during the maintenance process, when the circuit breaker is in the open state and the three-position is in the isolation position (i.e. the line side has not realized grounding), the cable chamber door still cannot be opened at this time, which can effectively avoid entering the high-voltage live interval by mistake during the maintenance process.

[0024] 3. In order to further improve the safety of the maintenance process, when the cable chamber door is in the open state, the I-shaped interlocking plate four moves upward under the action of the spring elastic force to block the circuit breaker opening button, and the circuit breaker cannot be manually opened, which can effectively improve the safety of the maintenance process. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying the creative labor.

[0026] Figure 1 It is the front view structural drawing of the whole inflation cabinet;

[0027] Figure 2 It is the side view structural drawing of the whole inflation cabinet;

[0028] Figure 3 It is Figure 1 The three-dimensional structural drawing of the middle chamber door interlocking mechanism;

[0029] Figure 4 It is Figure 1 The three-dimensional structural drawing of the middle three-position interlocking mechanism;

[0030] Figure 5 It is Figure 1 The three-dimensional structural drawing of the interlocking part in the circuit breaker interlocking mechanism;

[0031] Figure 6 It is Figure 1 The three-dimensional structural drawing of the reverse interlocking part in the circuit breaker interlocking mechanism;

[0032] Figure 7 It is Figure 3 The three-dimensional structural drawing of the L-shaped interlocking plate one.

[0033] Mark in the figure: 1-chamber door interlocking mechanism, 101-L-shaped interlocking plate one, 102-steel wire rope fixing joint, 103-electromagnetic lock baffle, 104-electromagnetic lock, 105-chamber door interlocking rod, 106-C-shaped interlocking plate, 107-I-shaped interlocking plate one, 108-L-shaped interlocking plate two, 109-reverse interlocking plate, 110-I-shaped interlocking plate two; 2-three-position interlocking mechanism, 201-interlocking block one, 202-interlocking block two; 3-circuit breaker interlocking part; 301-circuit breaker interlocking rod, 302-circuit breaker crank; 4-circuit breaker reverse interlocking part, 401-I-shaped interlocking plate three, 402-I-shaped interlocking plate four, 403-Z-shaped interlocking plate; 5-inflation compartment; 6-mechanism compartment; 7-cable compartment; 8-instrument compartment; 9-busbar compartment; 10-pressure relief channel; 11-cable chamber door. DETAILED DESCRIPTION

[0034] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only the main embodiments of the utility model, instead of all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0035] As Figures 1-2As shown in the figure, a kind of air chamber pull-type mechanical interlocking system, the air chamber includes inflatable part and non-inflatable part;Inflatable part includes inflatable compartment 5;Three-position disconnecting switch and circuit breaker are installed in inflatable compartment 5;Non-inflatable part includes mechanism compartment 6 and cable compartment 7, wherein cable compartment 7 is distributed below mechanism compartment 6;Non-inflatable part also includes instrument compartment 8, bus compartment 9 and pressure relief passage 10, wherein instrument compartment 8 is located above mechanism compartment 6, wherein bus compartment 9 and pressure relief passage 10 are located above and beside inflatable compartment 5 respectively;The pull-type mechanical interlocking system includes three-position interlocking mechanism 2 and circuit breaker interlocking mechanism installed in mechanism compartment 6, and chamber door interlocking mechanism 1 installed in cable compartment 7;Wherein three-position interlocking mechanism 2, circuit breaker interlocking mechanism and chamber door interlocking mechanism 1 are sequentially distributed from top to bottom and mechanically linked with each other;Three-position interlocking mechanism 2, circuit breaker interlocking mechanism are connected with three-position disconnecting switch and circuit breaker in inflatable compartment 5 respectively;Cable chamber door 11 is hingedly installed at the back of cable compartment 7, and chamber door interlocking mechanism 1 is connected with cable chamber door 11.

[0036] As shown in the figure, Figure 3 , Figure 7 As shown in the figure, chamber door interlocking mechanism 1 includes L-shaped interlocking plate one 101, steel wire rope fixing connector 102, electromagnetic lock 104 baffle 103, electromagnetic lock 104, chamber door interlocking rod 105, C-shaped interlocking plate 106, I-shaped interlocking plate one 107, L-shaped interlocking plate two 108, reverse interlocking plate 109 and I-shaped interlocking plate two 110;L-shaped interlocking plate one 101 is fixed to the crossbeam of cable chamber through steel wire rope fixing connector 102, and L-shaped interlocking plate one 101 is provided with mounting hole and connected with electromagnetic lock 104 baffle 103 through it;C-shaped interlocking plate 106 is provided with lock rod guide hole and fixedly installed on cable chamber door 11;I-shaped interlocking plate one 107 is installed on L-shaped interlocking plate two 108, and L-shaped interlocking plate two 108 is provided with rivet nut hole and installed on cable chamber door 11 through it;Reverse interlocking plate 109 is connected to the middle plate of L-shaped interlocking plate one 101 through internal hexagonal bolt and lock nut, one end of reverse interlocking plate 109 is welded and fixed with I-shaped interlocking plate two 110, and the other end of reverse interlocking plate 109 is inserted into the guide groove of the side plate of L-shaped interlocking plate one 101;

[0037] Wherein, steel wire rope fixing connector 102 is fixed to the crossbeam of cable chamber while also fixing the steel wire rope skin;

[0038] Wherein, chamber door interlocking rod 105 is composed of lock rod and round pipe head;

[0039] Wherein, I-shaped interlocking plate one 107 is provided with long circular hole for adjusting front and back distance, and the diameter of the long circular hole is 3-5mm.

[0040] As shown in the figure, Figure 4As shown, the three-position interlocking mechanism 2 is provided with an interlocking block one 201 mounted on the transmission shaft of the three-position disconnector, and an interlocking block two 202 fixedly mounted on the interlocking block one 201.

[0041] As shown, Figures 5-6 As shown, the circuit breaker interlocking mechanism comprises a circuit breaker interlocking part 3 and a circuit breaker reverse interlocking part 4; the circuit breaker interlocking part 3 is provided with a circuit breaker interlocking rod 301 and a circuit breaker crank arm 302, the lower end of the circuit breaker interlocking rod 301 is welded with a circular wire pressing plate for fixing a steel wire, and the circuit breaker interlocking rod 301 is connected to the circuit breaker crank arm 302 through screw threads; the circuit breaker reverse interlocking part 4 is provided with an I-shaped interlocking plate three 401, an I-shaped interlocking plate four 402 and a Z-shaped interlocking plate 403; the I-shaped interlocking plate three 401 is fixed on the circuit breaker mechanism through bolts and is used for guiding and spring fixing of the I-shaped interlocking plate four 402; one end of the Z-shaped interlocking plate 403 is fixed on the bottom plate of the mechanism compartment 6, the other end of the Z-shaped interlocking plate 403 is provided with a guide groove for guiding the I-shaped interlocking plate four 402 to move up and down, one end of the I-shaped interlocking plate four 402 is provided with a round hole for connecting an open pin to fix a spring, and the other end of the I-shaped interlocking plate four 402 is connected with the steel wire.

[0042] As described above, the two room door interlocking rods 105 in the room door interlocking mechanism 1 are connected with the circuit breaker interlocking rod 301 of the circuit breaker interlocking part 3 and the interlocking block two 202 in the three-position interlocking mechanism 2 through the steel wires.

[0043] Working principle of the utility model:

[0044] S1, when the circuit breaker is in the tripping state and the three-position is in the isolation position or the isolation closing position (i.e. the line side does not realize grounding), the room door interlocking rod 105 is inserted into the long round hole of the I-shaped interlocking plate one 107 to form a lock with the cable room door 11, at this time, the cable room door 11 cannot be opened;

[0045] S2, when the circuit breaker is closed, the circuit breaker crank arm 302 drives the circuit breaker interlocking rod 301 to move upward, the circular wire pressing plate on the circuit breaker interlocking rod 301 pulls the steel wire upward, the steel wire drives the Figure 3 left room door interlocking rod 105 to move upward, and the spring on the left room door interlocking rod 105 is in a compressed state, at this time, the circuit breaker and the cable room door 11 are unlocked;

[0046] S3, when the three-position interlocking mechanism 2 is operated from the isolation closing position to the grounding position, the interlocking block one 201 rotates to the right, the interlocking block two 202 provided thereon pulls the steel wire, the steel wire drives the Figure 3 right room door interlocking rod 105 to move upward, and the spring on the right room door interlocking rod 105 is in a compressed state, at this time, the three-position and the cable room door 11 are unlocked;

[0047] S4, when the circuit breaker is off, the three-position switch is not in the ground position, the door interlock rod 105 falls under the action of spring force, at this time the circuit breaker and the three-position switch and the cable chamber door 11 form a lock, the cable chamber door 11 cannot be opened;

[0048] S5, when the cable chamber door 11 is in the closed state, the cable chamber door 11 pushes the auxiliary Figure 3 The reverse interlocking plate 109 rotates downward, the I-shaped interlocking plate two 110 of the reverse interlocking plate 109 pulls the steel wire rope, the steel wire rope drives the auxiliary Figure 6 The I-shaped interlocking plate four 402 moves downward, at this time the I-shaped interlocking plate four 402 and the circuit breaker off button interlocking are released, the spring on the I-shaped interlocking plate four 402 is in the compressed state, and the circuit breaker can be manually off;

[0049] S6, when the cable chamber door 11 is in the open state, the I-shaped interlocking plate four 402 moves upward under the action of spring force and blocks the circuit breaker off button, and the circuit breaker cannot be manually off.

[0050] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pull-type mechanical interlocking system of an air- insulated switchgear, the air-insulated switchgear comprising an air- insulated section and a non-air-insulated section; the air-insulated section comprising an air- insulated chamber, and a three-position disconnector and a circuit breaker installed in the air- insulated chamber; the non-air-insulated section comprising a mechanism chamber and a cable chamber, wherein the cable chamber is distributed below the mechanism chamber, and the non-air-insulated section further comprising an instrument chamber, a bus chamber and a pressure relief passage, wherein the instrument chamber is located above the mechanism chamber, and the bus chamber and the pressure relief passage are respectively located above and beside the air- insulated chamber; characterized in that the pull-type mechanical interlocking system comprising a three-position interlocking mechanism and a circuit breaker interlocking mechanism installed in the mechanism chamber, and a chamber door interlocking mechanism installed in the cable chamber, wherein the three-position interlocking mechanism, the circuit breaker interlocking mechanism and the chamber door interlocking mechanism are sequentially distributed from top to bottom and mechanically linked with each other; the three-position interlocking mechanism and the circuit breaker interlocking mechanism are connected with the three-position disconnector and the circuit breaker in the air- insulated chamber respectively, and a cable chamber door is installed at the back of the cable chamber, and the chamber door interlocking mechanism is connected with the cable chamber door.

2. The gas insulated switchgear draw-out mechanical interlocking system of claim 1, wherein: the chamber door interlocking mechanism comprising an L-shaped interlocking plate one, a steel wire rope fixing connector, an electromagnetic lock baffle, an electromagnetic lock, a chamber door interlocking rod, a C-shaped interlocking plate, an I-shaped interlocking plate one, an L-shaped interlocking plate two, a reverse interlocking plate and an I-shaped interlocking plate two; the L-shaped interlocking plate one is fixed to the crossbeam of the cable chamber through the steel wire rope fixing connector, and the L-shaped interlocking plate one is provided with a mounting hole and connected with the electromagnetic lock baffle through the mounting hole; the C-shaped interlocking plate is provided with a lock rod guide hole and fixedly installed on the cable chamber door; the I-shaped interlocking plate one is installed on the L-shaped interlocking plate two, and the L-shaped interlocking plate two is provided with a rivet nut hole and installed on the cable chamber door through the rivet nut hole; the reverse interlocking plate is connected to the middle plate of the L-shaped interlocking plate one through an inner hexagonal bolt and a lock nut, one end of the reverse interlocking plate is welded and fixed with the I-shaped interlocking plate two, and the other end of the reverse interlocking plate is inserted into the guide groove of the side plate of the L-shaped interlocking plate one.

3. The gas insulated switchgear draw-out mechanical interlocking system of claim 2, wherein: the steel wire rope fixing connector is fixed to the crossbeam of the cable chamber and also fixed to the steel wire rope.

4. The gas insulated switchgear draw-out mechanical interlocking system of claim 3, wherein: the chamber door interlocking rod is composed of a lock rod and a round pipe head.

5. The gas insulated switchgear draw-out mechanical interlocking system of claim 4, wherein: a long circular hole is provided on the I-shaped interlocking plate one for adjusting the front and back distance, and the diameter of the long circular hole is 3-5 mm.

6. The gas insulated switchgear draw-out mechanical interlocking system of claim 5, wherein: the three-position interlocking mechanism is provided with an interlocking block one installed on the transmission shaft of the three-position disconnector, and the interlocking block one is fixedly installed with an interlocking block two.

7. The gas insulated switchgear draw-out mechanical interlocking system of claim 6, wherein: the circuit breaker interlocking mechanism comprises a circuit breaker interlocking part and a circuit breaker reverse interlocking part; the circuit breaker interlocking part is provided with a circuit breaker interlocking rod and a circuit breaker crank arm, and a circular wire pressing plate for fixing the steel wire rope is welded to the lower end of the circuit breaker interlocking rod and connected with the circuit breaker crank arm through a thread; The circuit breaker reverse interlocking part is provided with I-shaped interlocking plate three, I-shaped interlocking plate four and Z-shaped interlocking plate; the I-shaped interlocking plate three is fixed on the circuit breaker mechanism through bolts and is used for guiding and spring fixing of the I-shaped interlocking plate four; one end of the Z-shaped interlocking plate is fixed on the mechanism compartment bottom plate, the other end of the Z-shaped interlocking plate is provided with a guide groove for guiding the up and down movement of the I-shaped interlocking plate four, one end of the I-shaped interlocking plate four is provided with a round hole for connecting an open pin to fix a spring, and the other end of the I-shaped interlocking plate four is connected with a steel wire rope.

8. The gas insulated switchgear draw mechanism interlock system of claim 7, wherein: The two chamber door interlocking rods in the chamber door interlocking mechanism are connected with the circuit breaker interlocking rod of the circuit breaker interlocking part and the interlocking block two in the three-position interlocking mechanism through steel wire ropes.

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