Interlocking system for mechanical lock of grounding switch of gas-insulated switchgear

Abstract

The utility model discloses a mechanical lock interlocking system for a grounding switch of a gas insulated switchgear, which belongs to the technical field of insulated switches and comprises a circuit breaker operating mechanism and a three-position operating mechanism which are mounted in a mechanism compartment. The grounding interlocking device is arranged between the low-voltage compartment and the high-voltage compartment in a penetrating manner below the mechanism compartment; wherein the three-station operating mechanism, the circuit breaker operating mechanism and the grounding interlocking device are sequentially distributed from top to bottom, and every two of the three-station operating mechanism, the circuit breaker operating mechanism and the grounding interlocking device are mechanically linked; the circuit breaker operating mechanism and the three-station operating mechanism are respectively connected with the circuit breaker and the three-station isolating switch in the inflatable compartment; a rear lower door plate is installed behind the high-voltage compartment cabinet, and the grounding interlocking device is connected with the rear lower door plate. Operation and maintenance personnel must operate in sequence when wanting to open the rear lower door plate of the high-voltage compartment; by adopting the mechanical interlocking, programmed step operation of an operator can be ensured, the reliability is higher, and the personal safety of the operation and maintenance personnel can be further ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of insulation switch, concretely is a kind of mechanical lock interlocking system of gas-filled switchgear grounding switch. BACKGROUND

[0002] Gas-filled switchgear 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. It has high protection level and can operate stably in harsh environments such as condensation, pollution and salt fog. The high-voltage components inside the gas-filled switchgear 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, gas-filled switchgear 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, and is especially suitable for harsh environment conditions such as high humidity, high altitude and pollution, and is widely used in power system.

[0003] At present, according to the "National Grid Company Safety Management Regulations for Preventing Electrical Misoperation", the medium voltage distribution switchgear itself should have the five prevention functions of "preventing misoperation of circuit breaker, preventing closing of isolating switch with load, preventing closing of grounding switch with load, preventing power supply with grounding switch, and preventing entering live compartment" while meeting the requirements of national standard. For the function of "preventing entering live compartment", it is required that the high-voltage compartment door can be opened only after the high-voltage compartment is grounded, and it is also required that the grounding switch can be operated only after the high-voltage compartment door is closed. The existing gas-filled switchgear mostly only has electrical interlocking, which needs to be powered to realize interlocking function, and cannot be used in case of power failure, so its reliability is not as good as that of traditional mechanical interlocking. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide a mechanical lock interlocking system of gas-filled switchgear grounding switch. The operation personnel want to open the lower door plate of high-voltage compartment, and must operate in the following order: first, operate the circuit breaker operating mechanism to open, then operate the three-position mechanism to close the grounding switch, then operate the circuit breaker operating mechanism to close, realize the grounding state of high-voltage compartment, then operate the grounding interlocking device to release the lower door plate lock, and open the lower door plate of high-voltage compartment. The above mechanical interlocking can ensure the programmed operation of operator, has higher reliability, and can further ensure the personal safety of operation and maintenance personnel.

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

[0006] A mechanical lock interlocking system of gas-filled switchgear grounding switch, the gas-filled switchgear comprises a gas-filled part and a non-gas-filled part.

[0007] The inflatable part comprises an inflatable compartment; a circuit breaker and a three-position disconnecting switch are installed in the inflatable compartment;

[0008] The non-inflatable part comprises a mechanism compartment, a low-voltage compartment and a high-voltage compartment, wherein the low-voltage compartment is distributed above and below the mechanism compartment, and the high-voltage compartment is distributed on one side of the lower low-voltage compartment; the non-inflatable part further comprises a busbar compartment and a pressure relief channel, wherein the busbar compartment and the pressure relief channel are located above and on one side of the inflatable compartment, respectively, and a rear upper door plate is hingedly installed at the back of the cabinet of the pressure relief channel;

[0009] The grounding switch mechanical lock interlocking system comprises a circuit breaker operating mechanism and a three-position operating mechanism installed in the mechanism compartment, and a grounding interlocking device penetratingly installed between the low-voltage compartment below the mechanism compartment and the high-voltage compartment; wherein the three-position operating mechanism, the circuit breaker operating mechanism and the grounding interlocking device are sequentially distributed from top to bottom and mechanically linked with each other in pairs;

[0010] The circuit breaker operating mechanism and the three-position operating mechanism are connected with the circuit breaker and the three-position disconnecting switch in the inflatable compartment, respectively; a rear lower door plate is hingedly installed at the back of the cabinet of the high-voltage compartment, and the grounding interlocking device is connected with the rear lower door plate.

[0011] As a preferred embodiment of the grounding switch mechanical lock interlocking system of the inflatable cabinet, the three-position operating mechanism is provided with a cam, and the cam is rotatably installed on a first rotating shaft, wherein the cam can rotate around the central axis of the first rotating shaft;

[0012] The three-position operating mechanism is further provided with a limiting plate, and the limiting plate is rotatably installed on a second rotating shaft, wherein the limiting plate can rotate around the central axis of the second rotating shaft;

[0013] The three-position operating mechanism is further provided with a first sliding plate, and a three-position interlocking plate is fixedly installed on the first sliding plate.

[0014] As a preferred embodiment of the grounding switch mechanical lock interlocking system of the inflatable cabinet, the limiting plate is located above the cam and always tangent to the cam.

[0015] As a preferred embodiment of the grounding switch mechanical lock interlocking system of the inflatable cabinet, the circuit breaker operating mechanism is provided with a main shaft, and a closing limiting plate and an opening limiting plate are fixedly installed on the main shaft;

[0016] The circuit breaker operating mechanism is further provided with a guide plate, a circuit breaker interlocking rod is penetratingly installed on the guide plate, a reset spring one is sleeved on the circuit breaker interlocking rod, and a press wheel baffle is fixedly installed above the circuit breaker interlocking rod;

[0017] The circuit breaker operating mechanism is further provided with a pressure wheel support plate, a pressure wheel rotating shaft is installed through the pressure wheel support plate, a pressure wheel mounting plate is fixedly installed at one end of the pressure wheel rotating shaft, and an interlocking shaft plate is fixedly installed at the other end of the pressure wheel rotating shaft; the two ends of the pressure wheel mounting plate are installed through the pressure wheel, and the locking shaft of the interlocking shaft plate is located in the three-position interlocking plate of the three-position operating mechanism.

[0018] As a preferred embodiment of the mechanical lock interlocking system of the gas-filled cabinet grounding switch, the circuit breaker operating mechanism is further provided with a guide sleeve one and a guide sleeve two, a circuit breaker interlocking shaft is installed through the guide sleeve one and the guide sleeve two, a reset spring two is sleeved on the outside of the guide sleeve one, a tripping button limiting plate is fixedly installed on the circuit breaker interlocking shaft, an interlocking block is fixedly installed on the circuit breaker interlocking shaft, and a limiting plate baffle is fixedly installed on the circuit breaker interlocking shaft; the circuit breaker operating mechanism is further provided with a tripping button rotating shaft, and a tripping pressure plate is fixedly installed on the tripping button rotating shaft.

[0019] As a preferred embodiment of the mechanical lock interlocking system of the gas-filled cabinet grounding switch, the grounding interlocking device is provided with a front door support, and a guide block is fixedly installed on the front door support;

[0020] The grounding interlocking device is further provided with a sliding plate two, the sliding plate two can move up and down along the guide block, one end of the sliding plate two is fixedly installed on the circuit breaker interlocking shaft through a connecting rod, an operating large shaft is installed through the front door support, a fan-shaped plate is fixedly installed on the operating large shaft, and a guide groove is arranged at one end of the operating large shaft facing the cabinet rear, and a locking shaft sleeve and a reset spring three are simultaneously inserted into the guide groove.

[0021] As a preferred embodiment of the mechanical lock interlocking system of the gas-filled cabinet grounding switch, the operating large shaft is installed through a rear door support, and the rear door support is fixedly installed in the high-voltage compartment; a limiting groove is arranged on the rear door support; a locking bolt is fixedly installed on the locking shaft sleeve, and the two are fixedly connected through screws; and two bosses are arranged on the locking shaft sleeve.

[0022] As a preferred embodiment of the mechanical lock interlocking system of the gas-filled cabinet grounding switch, a locking hole is formed in the rear lower door plate.

[0023] After the above technical scheme is adopted, the utility model has the following beneficial effects:

[0024] 1. In order to open the rear lower door plate of the high-voltage compartment, the operation and maintenance personnel must operate in the following order: first, operate the circuit breaker operating mechanism to trip, then operate the three-position mechanism to ground switch to close, then operate the circuit breaker operating mechanism to close, so that the high-voltage compartment is in a grounded state, then operate the grounding interlocking device to release the rear lower door plate locking, and open the rear lower door plate of the high-voltage compartment; the above-mentioned mechanical interlocking can ensure that the operator operates in a programmed manner, has higher reliability, and can further ensure the personal safety of the operation and maintenance personnel;

[0025] 2. The high-voltage compartment door plate can not operate the breaker operating mechanism to open, and further cannot operate the three-position mechanism grounding switch to open, so that the high-voltage compartment grounding state cannot be removed;

[0026] 3. The gas-filled cabinet can be operated in the following order during use: first close the back door plate, then operate the grounding interlocking device to lock the back door plate, then operate the breaker operating mechanism to open, then operate the three-position mechanism grounding switch to open, then operate the three-position mechanism isolation switch to close, then operate the breaker operating mechanism to close, and restore power transmission;

[0027] 4. The gas-filled cabinet can be operated to open the high-voltage compartment back door plate by the grounding interlocking device in case of emergency during use. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0029] Figure 1 is a three-dimensional structure diagram of the gas-filled cabinet as a whole;

[0030] Figure 2 is Figure 1 is a three-dimensional structure diagram of the three-position mechanism in the middle;

[0031] Figure 3 is Figure 1 is a three-dimensional structure diagram of the breaker operating mechanism;

[0032] Figure 4 is Figure 3 is a partial three-dimensional structure diagram of the grounding interlocking device;

[0033] Figure 5 is Figure 1 is a three-dimensional structure diagram of the grounding interlocking device;

[0034] Figure 6 is Figure 5 is a partial three-dimensional structure diagram of the grounding interlocking device;

[0035] Figure 7 is a structure diagram of the closing limit plate and the opening limit plate in the breaker operating mechanism in step one when the breaker operating mechanism is in the closing state;

[0036] Figure 8This is a structural diagram showing the positions of the closing limit plate and the opening limit plate when the circuit breaker operating mechanism is in the open state in step two.

[0037] Figure 9 This is a structural diagram showing the location of the limit plate when the three-position operating mechanism is not in the closed state of the grounding switch in step four.

[0038] Figure 10 This is a structural diagram showing the location of the limit plate when the three-position operating mechanism is in the closed state of the grounding switch in step five.

[0039] Figure 11 This is a structural diagram of the locking hole when it is closed;

[0040] Figure 12 This is a structural diagram of the locking hole when it is open;

[0041] Figure 13 This is a structural diagram of the grounding interlocking device after the locking bushing moves under the action of the return spring in step six;

[0042] Figure 14 This is a structural diagram showing the location of the sector plate when the main shaft cannot rotate in step six.

[0043] Figure 15 This is a structural diagram showing the position of the sector plate after the operating shaft rotates 90 degrees in step seven.

[0044] Figure 16 This is a structural diagram showing the location of the trip button limit plate when the circuit breaker interlocking rod is in the upward position in step six.

[0045] Marked in the figure: 1-Three-station operating mechanism, 101-Cam, 102-Turning shaft one, 103-Limiting plate, 104-Turning shaft two, 105-Sliding plate one, 106-Three-station interlocking plate; 2-Circuit breaker operating mechanism, 201-Main shaft, 202-Closing limiting plate, 203-Opening limiting plate, 204-Guide plate, 205-Circuit breaker interlocking rod, 206-Reset spring one, 207-Pressing wheel baffle, 208-Pressing wheel support plate, 209-Pressing wheel turning shaft, 210-Pressing wheel mounting plate, 211-Interlocking shaft plate, 212-Pressing wheel, 213-Guide sleeve one, 214-Guide sleeve two, 215-Circuit breaker interlocking shaft, 216-Reset spring two, 217-Opening button limiting plate, 218-Interlocking block, 219-Limiting plate baffle, 220-Opening button turning shaft, 221-Opening pressing plate; 3-Mechanism compartment; 4-Earth interlocking device, 401-Front door support, 402-Guide block, 403-Sliding plate two, 404-Connecting rod, 405-Operating major axis, 406-Sector plate, 407-Guide groove, 408-Locking shaft sleeve, 409-Reset spring three, 410-Rear door support, 411-Limiting groove, 412-Locking bolt, 413-Screw, 414-Projection; 5-Low-voltage compartment; 6-Dividing plate; 7-Busbar compartment; 8-Inflation compartment; 9-Pressure relief channel; 10-Rear upper door plate; 11-Rear lower door plate, 1101-Locking hole; 12-High-voltage compartment. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only the main embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0047] As Figure 1As shown, a mechanical interlocking system for a gas-insulated switchgear grounding switch is disclosed. The gas-insulated switchgear includes an inflatable section and a non-inflatable section. The inflatable section includes an inflatable compartment 8, which houses a circuit breaker and a three-position disconnector. The non-inflatable section includes a mechanism compartment 3, a low-voltage compartment 5, and a high-voltage compartment 12. The low-voltage compartment 5 is located above and below the mechanism compartment 3, and the high-voltage compartment 12 is spaced apart by partitions 6 on one side of the lower low-voltage compartment 5. The non-inflatable section also includes a busbar compartment 7 and a pressure relief channel 9, located above and to the side of the inflatable compartment 8, respectively. A rear upper door panel is hinged to the rear of the pressure relief channel 9. 10; The grounding switch mechanical lock interlocking system includes a circuit breaker operating mechanism 2 and a three-position operating mechanism 1 installed in the mechanism compartment 3, and a grounding interlocking device 4 installed between the low-voltage compartment 5 and the high-voltage compartment 12 below the mechanism compartment 3; wherein the three-position operating mechanism 1, the circuit breaker operating mechanism 2 and the grounding interlocking device 4 are distributed sequentially from top to bottom and are mechanically linked to each other in pairs; the circuit breaker operating mechanism 2 and the three-position operating mechanism 1 are respectively connected to the circuit breaker and the three-position disconnecting switch in the gas-filled compartment 8; a rear lower door panel 11 is hinged to the rear of the high-voltage compartment 12 cabinet, and the grounding interlocking device 4 is connected to the rear lower door panel 11.

[0048] like Figure 2 As shown, the three-station operating mechanism 1 is provided with a cam 101, which is rotatably mounted on a rotating shaft 102, and the cam 101 can rotate around the central axis of the rotating shaft 102. The three-station operating mechanism 1 is also provided with a limiting plate 103, which is rotatably mounted on a rotating shaft, and the limiting plate 103 can rotate around the central axis of a rotating shaft 104. The three-station operating mechanism 1 is also provided with a sliding plate 105, on which a three-station interlocking plate 106 is fixedly mounted. The limiting plate 103 is located above the cam 101 and is always tangent to the cam 101.

[0049] like Figures 3-4 As shown, the circuit breaker operating mechanism 2 is provided with a main shaft 201, on which a closing limit plate 202 and a opening limit plate 203 are fixedly installed; the circuit breaker operating mechanism 2 is also provided with a guide plate 204, on which a circuit breaker interlocking rod 205 is installed through, a return spring 206 is fitted on the circuit breaker interlocking rod 205, and a pressure roller baffle 207 is fixedly installed above the circuit breaker interlocking rod 205; the circuit breaker operating mechanism 2 It is also provided with a pressure roller 212 support plate 208, on which a pressure roller 212 rotating shaft 209 is installed through. A pressure roller mounting plate 210 is fixedly installed at one end of the pressure roller rotating shaft 209, and an interlocking shaft plate 211 is fixedly installed at the other end of the pressure roller rotating shaft 209. Both ends of the pressure roller mounting plate 210 are installed through the pressure roller 212, and the locking shaft of the interlocking shaft plate 211 is located in the three-position interlocking plate 106 of the three-position operating mechanism 1.

[0050] As Figures 5-6 shown, the circuit breaker operating mechanism 2 is also provided with a guide sleeve one 213 and a guide sleeve two 214, the circuit breaker interlock shaft 215 is installed through in the guide sleeve one 213 and the guide sleeve two 214, the guide sleeve one 213 is externally sleeved with reset spring two 216, the circuit breaker interlock shaft 215 is fixedly installed with the tripping button limiting plate 217; The circuit breaker interlock shaft 215 is fixedly installed with the interlocking block 218, and the circuit breaker interlock shaft 215 is fixedly installed with the limiting plate 103 baffle; The circuit breaker operating mechanism 2 is also provided with a tripping button rotating shaft 220, and the tripping button rotating shaft 220 is fixedly installed with a tripping pressure plate 221. The grounding interlock device 4 is provided with a front door support 401, and the front door support 401 is fixedly installed with a guide block 402; The grounding interlock device 4 is also provided with a sliding plate two 403, which can move up and down along the guide block 402; One end of the sliding plate two 403 is fixedly installed on the circuit breaker interlock shaft 215 through a connecting rod 404; The front door support 401 is installed through with an operating large shaft 405, and the operating large shaft 405 is fixedly installed with a sector plate 406; The end of the operating large shaft 405 towards the cabinet rear is provided with a guide groove 407, and the guide groove 407 is simultaneously inserted with a locking shaft sleeve 408 and a reset spring three 409. The operating large shaft 405 is installed through with a rear door support 410, and the rear door support 410 is fixedly installed in the high-voltage compartment 12; The rear door support 410 is provided with a limiting groove 411; The locking shaft sleeve 408 is fixedly installed with a locking bolt 412, and the two are fixedly connected by screws 413; The locking shaft sleeve 408 is provided with two bosses 414.

[0051] As Figures 11-12 shown, the rear lower door plate 11 is provided with a locking hole 1101.

[0052] The working principle of the utility model:

[0053] Step one, when the circuit breaker operating mechanism 2 is in the closing state, the closing limiting plate 202 of the circuit breaker operating mechanism 2 is in the Figure 7 position shown, the closing limiting plate 202 is rotated to be directly below the circuit breaker interlock rod 205, so that the circuit breaker interlock rod 205 cannot be moved downward, the pressure wheel baffle 207 cannot be moved downward, and the pressure wheel 212 is resisted, so that the pressure wheel rotating shaft 209 cannot be rotated, so that the interlocking shaft plate 211 cannot be actuated, so that the three-position interlocking plate 106 cannot be horizontally moved, the sliding plate of the three-position operating mechanism 1 cannot be moved horizontally, and the three-position operating mechanism 1 cannot be operated.

[0054] Step two, when the circuit breaker operating mechanism 2 is in the tripping state, the closing limiting plate 202 of the circuit breaker operating mechanism 2 is in the Figure 8The position shown, the closing limit plate 202 rotates and the circuit breaker interlock rod 205 is staggered, the circuit breaker interlock rod 205 can be moved down, the pressure wheel baffle 207 can be moved down, the pressure wheel shaft 209 can be rotated, the interlock shaft plate 211 can be rotated, the three-position interlock plate 106 can be horizontally moved, the slide plate of the three-position operating mechanism 1 can be moved horizontally, and the three-position operating mechanism 1 can be operated.

[0055] Step three, when the circuit breaker operating mechanism 2 is in the open state, the opening limit plate 203 of the circuit breaker operating mechanism 2 is in Figure 8 The position shown, the limit plate 103 baffle is below the opening limit plate 203, the limit plate 103 baffle cannot move up, the circuit breaker interlock shaft 215 cannot move up, the slide plate fixedly connected with the circuit breaker interlock shaft 215 through the connecting rod 404 cannot move up, the operation big shaft 405 operation hole of the grounding interlock device 4 cannot be exposed, and the grounding interlock device 4 cannot limit the rear lower door plate 11, and the rear lower door plate 11 cannot be opened.

[0056] Step four, when the three-position operating mechanism 1 is not in the grounding switch closing state, the cam 101 non-tuberosity of the three-position operating mechanism 1 contacts the limit plate 103, the position of the limit plate 103 is as shown in Figure 9 The position shown, one end of the limit plate 103 is above the interlocking block 218 of the circuit breaker operating mechanism 2, so that the interlocking block 218 cannot move up, the circuit breaker interlock shaft 215 cannot move up, the slide plate fixedly connected with the circuit breaker interlock shaft 215 through the connecting rod 404 cannot move up, the operation big shaft 405 operation hole of the grounding interlock device 4 cannot be exposed, and the grounding interlock device 4 cannot limit the rear lower door plate 11, and the rear lower door plate 11 cannot be opened.

[0057] Step five, when the three-position operating mechanism 1 is in the grounding switch closing state and the circuit breaker operating mechanism 2 is in the closing state, the cam 101 of the three-position operating mechanism 1 contacts the limit plate 103, the position of the limit plate 103 is as shown in Figure 10 The position shown, the limit plate 103 is staggered with the interlocking block 218 of the circuit breaker operating mechanism 2, the interlocking block 218 can move up, and the opening limit plate 203 of the circuit breaker operating mechanism 2 is in Figure 7 The position shown, the limit plate 103 baffle is staggered with the opening limit plate 203, the limit plate 103 baffle can move up, the circuit breaker interlock shaft 215 can move up, the slide plate fixedly connected with the circuit breaker interlock shaft 215 through the connecting rod 404 can move up, and the operation big shaft 405 operation hole of the grounding interlock device 4 can be exposed. The operation big shaft 405 is rotated, the locking shaft sleeve 408 and the locking lock tongue 412 of the grounding interlock device 4 are rotated to Figure 12 The state shown, the locking lock tongue 412 can be pulled out of the locking hole 1101 on the rear lower door plate 11, and the rear lower door plate 11 can be opened.

[0058] Step Six: When the lower rear door panel 11 is in the open state, the locking sleeve 408 of the grounding interlock device 4 moves to the position under the action of the return spring. Figure 13 At the position shown, the boss 414 of the locking bushing 408 is embedded in the limiting groove 411 of the rear door support 410, preventing the locking bushing 408 from rotating. The operating shaft 405 connected to the locking bushing 408 also cannot rotate. At this time, the sector plate 406 fixed to the operating shaft 405 is in a position... Figure 14 At the indicated position, the upper edge of the sector plate 406 abuts against the bent edge of the sliding plate. At this point, the sliding plate cannot move downwards, and the circuit breaker interlocking rod 205, which is fixed to the sliding plate via the connecting rod 404, is in an upward-moving state. At this time, the trip button limit plate 217, which is fixed to the circuit breaker interlocking rod 205, is in a downward-moving state. Figure 16 As shown, the tripping pressure plate 221 is blocked, preventing the tripping pressure plate 221 from rotating. Consequently, the tripping button shaft 220 cannot rotate, thus preventing the tripping operation.

[0059] Step 7: When the lower rear door panel 11 is closed, as follows Figure 13 As shown, the locking sleeve 408 of the grounding interlocking device 4 moves forward under the action of the rear lower door. The boss 414 of the locking sleeve 408 disengages from the limiting groove 411 of the rear door support 410, allowing the locking sleeve 408 to rotate. The operating shaft 405 connected to the locking sleeve 408 can also rotate. The rotating operating shaft 405 rotates 90 degrees, at which time the position of the locking sleeve 408 is as shown. Figure 11 As shown, the position of sector plate 406 is as follows Figure 15 As shown, the latch cannot disengage from the locking hole 1101 on the lower rear door panel 11, thus locking the lower rear door panel 11. At this time, the sector plate 406 releases its limit on the sliding plate, allowing the sliding plate to move downwards. The circuit breaker interlocking rod 205, which is fixed to the sliding plate via the connecting rod 404, can also move downwards. The trip button limit plate 217, which is fixed to the circuit breaker interlocking rod 205, moves downwards to release its limit on the trip pressure plate 221. The trip pressure plate 221 can rotate, and the trip button shaft 220 can rotate, thus enabling the tripping operation.

[0060] Step 8: When the lower rear door panel 11 is in the locked position, it can be removed. Figure 11 Remove the fixing screw 413 behind the locking tongue 412, then remove the locking tongue 412 to release the locking tongue 412 from limiting the lower rear door panel 11, open the lower rear door panel 11, and realize emergency unlocking.

[0061] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An air- insulated switchgear mechanical lock interlocking system, the air- insulated switchgear comprising an air- insulated part and a non- air- insulated part; the air- insulated part comprising an air- insulated compartment; a circuit breaker and a three- position disconnecting switch are installed in the air- insulated compartment; the non- air- insulated part comprising a mechanism compartment, a low- voltage compartment and a high- voltage compartment, wherein the low- voltage compartment is distributed above and below the mechanism compartment, and the high- voltage compartment is distributed beside the lower low- voltage compartment through a partition; the non- air- insulated part further comprising a busbar compartment and a pressure relief passage, wherein the busbar compartment and the pressure relief passage are respectively located above and beside the air- insulated compartment, and a rear upper door plate is installed at the back of the pressure relief passage; characterized in that the air- insulated switchgear mechanical lock interlocking system comprising a circuit breaker operating mechanism and a three- position operating mechanism installed in the mechanism compartment, and a grounding interlocking device penetratingly installed between the lower low- voltage compartment and the high- voltage compartment; wherein the three- position operating mechanism, the circuit breaker operating mechanism and the grounding interlocking device are sequentially distributed from top to bottom and mechanically linked with each other; the circuit breaker operating mechanism and the three- position operating mechanism are connected with the circuit breaker and the three- position disconnecting switch in the air- insulated compartment respectively; a rear lower door plate is installed at the back of the high- voltage compartment, and the grounding interlocking device is connected with the rear lower door plate.

2. The mechanical lock interlock system for a grounded switch of a gas insulated switchgear according to claim 1, characterized in that: the three- position operating mechanism is provided with a cam, which is rotatably installed on a first rotating shaft, wherein the cam can rotate around the central axis of the first rotating shaft; the three- position operating mechanism is further provided with a limiting plate, which is rotatably installed on a second rotating shaft, wherein the limiting plate can rotate around the central axis of the second rotating shaft; the three- position operating mechanism is further provided with a sliding plate one, on which a three- position interlocking plate is fixedly installed.

3. The mechanical lock interlock system for a grounded switch of a gas insulated switchgear according to claim 2, characterized in that: the limiting plate is located above the cam and always tangent to the cam.

4. The mechanical lock interlock system for an earthing switch of a gas insulated switchgear according to claim 3, characterized in that: the circuit breaker operating mechanism is provided with a main shaft, on which a closing limiting plate and an opening limiting plate are fixedly installed; the circuit breaker operating mechanism is further provided with a guide plate, on which a circuit breaker interlocking rod is penetratingly installed, and a reset spring one is sleeved on the circuit breaker interlocking rod; a press wheel stop plate is fixedly installed above the circuit breaker interlocking rod; the circuit breaker operating mechanism is further provided with a press wheel support plate, on which a press wheel rotating shaft is penetratingly installed; a press wheel installation plate is fixedly installed on one end of the press wheel rotating shaft, and an interlocking shaft plate is fixedly installed on the other end of the press wheel rotating shaft; the press wheel installation plate is penetratingly installed on the press wheel at both ends, and the locking shaft of the interlocking shaft plate is located in the three- position interlocking plate of the three- position operating mechanism.

5. The mechanical lock interlock system for a grounded switch of a gas insulated switchgear according to claim 4, characterized in that: the circuit breaker operating mechanism is further provided with a guide sleeve one and a guide sleeve two, in which a circuit breaker interlocking shaft is penetratingly installed; a reset spring two is sleeved on the outside of the guide sleeve one; an opening button limiting plate is fixedly installed on the circuit breaker interlocking shaft; an interlocking block is fixedly installed on the circuit breaker interlocking shaft; a limiting plate stop plate is fixedly installed on the circuit breaker interlocking shaft; and an opening button rotating shaft is further provided in the circuit breaker operating mechanism, on which an opening press plate is fixedly installed.

6. The mechanical lock interlock system for a grounded switch of a gas insulated switchgear according to claim 5, characterized in that: the grounding interlocking device is provided with a front door support, on which a guide block is fixedly installed; The ground interlocking device is further provided with a sliding plate II which can move up and down along the guide block; one end of the sliding plate II is fixedly installed on the circuit breaker interlocking shaft through a connecting rod; an operating large shaft is installed through the front door support; a sector plate is fixedly installed on the operating large shaft; the end of the operating large shaft towards the cabinet rear is provided with a guide groove, the guide groove is simultaneously inserted with a locking shaft sleeve and a reset spring.

7. The mechanical lock interlock system for a grounded switch of a gas insulated switchgear according to claim 6, characterized in that: The operating large shaft is installed through the rear door support which is fixedly installed in the high-voltage compartment; the rear door support is provided with a limiting groove; a locking bolt is fixedly installed on the locking shaft sleeve and the two are fixedly connected through screws; the locking shaft sleeve is provided with two bosses.

8. The mechanical lock interlock system for a grounded switch of an air insulated switchgear according to any one of claims 1 to 7, characterized in that: The rear lower door plate is provided with a locking hole.

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