48results about "Switchgear earthing arrangements" patented technology

The application discloses a kind of on-off mechanism for processing phase-to-phase fault, including two single-pole double-throw switches and a third switch, single-pole double-throw switch includes first arc chamber and second arc chamber, first fixed contact is provided in first arc chamber, second fixed contact is provided in second arc chamber, first composite movable contact is provided between first arc chamber and second arc chamber, first composite movable contact one end is located in first arc chamber, first composite movable contact other end is located in second arc chamber, first composite movable contact is connected with first fixed contact when then is disconnected with second fixed contact, first composite movable contact is connected with second fixed contact when then is disconnected with first fixed contact;Third switch includes third arc chamber, third fixed contact and third movable contact are provided in third arc chamber.The on-off mechanism structure is simple, can realize one fault phase conduction and make another fault phase connect ground or public wire, and it is convenient to be used with existing screen cabinet, with important practical value.

An electrical contact assembly includes a frame and an electrically conductive frame contact carried by the frame. A conductive clamp assembly is configured to slide on the electrically conductive frame contact into a contact position and clamp into secure electrical contact with the electrically conductive frame contact. The conductive clamp assembly includes opposing electrical contacts spaced apart a distance to receive the electrically conductive frame contact and slide thereon as the conductive clamp assembly moves into the contact position. A spring assembly is engaged to each electrical contact, and a pivot arm engaged with a respective spring assembly and configured to pivot onto the respective spring assembly to bias the respective spring assembly against the respective electrical contact.

The utility model discloses an isolation handcart for a high-voltage switch cabinet, which comprises a handcart body provided with a circuit breaker. The circuit breaker is provided with a moving contact and a fixing piece used for fixing the moving contact, a first fastening piece is arranged in the moving contact, and the first fastening piece penetrates through one end of the moving contact and then is connected with the fixing piece, so that one end of the moving contact is fixed on the circuit breaker; a grounding piece is further arranged on the bottom face of the vehicle body, and the grounding piece is rotationally installed on the bottom face of the vehicle body. Therefore, installation and replacement of the moving contact are simple and convenient, maintenance is convenient, and power failure time can be reduced. Besides, the grounding piece is arranged at the bottom of the vehicle body, so that the whole-course reliable grounding can be realized through frictional contact no matter the switch cabinet is in a running state or a quit state, the electric shock risk caused by static accumulation or fault current is avoided, the residual charge or induced voltage after the equipment is powered off can be quickly discharged, and the safety of maintenance personnel is guaranteed.

The utility model relates to a grounding switch mechanism for a centrally installed switchgear. The grounding switch mechanism comprises a first transmission shaft, a connecting seat, a first connecting rod, a first vertical rod, a second connecting rod, a support, a rotating shaft and a grounding switch. The first transmission shaft is horizontally and rotatably arranged at the bottom of the cable chamber, and one end of the first transmission shaft is connected with the driving motor; the connecting seat is fixedly sleeved on the first transmission shaft; one end of the first connecting rod is fixed on the connecting seat; first connecting parts are arranged at the two ends of the first vertical rod, the lower end of the first vertical rod is hinged to the first connecting rod through the first connecting parts, the upper end of the first vertical rod is hinged to the second connecting rod through the first connecting parts, and the first vertical rod is kept vertical all the time; one end of the second connecting rod fixedly sleeves the rotating shaft; the rotating shaft is horizontally and rotatably arranged on the bracket; the grounding knife is fixedly sleeved on the rotating shaft; the circuit breaker is connected with an adapter, and a grounding head of the adapter directly faces the grounding knife. The grounding switch mechanism is arranged in the cable chamber, so that personal safety is protected.

The invention discloses an electric grounding switch operation interlocking device, and belongs to the technical field of switch cabinet equipment. The device comprises a hexagonal operation shaft, and further comprises an interlocking mechanism which comprises a fixing piece and a transverse sliding plate; the driving mechanism comprises an eccentric front interlocking driving plate and an eccentric rear interlocking driving plate which are fixed on the hexagonal operation shaft; and the crank arm connecting rod mechanism comprises a crank arm, and a vertical connecting rod and a transverse connecting rod which are respectively hinged with the crank arm. When a motor of the electric grounding switch drives the hexagonal operation shaft to rotate clockwise to be switched on, the rear interlocking driving plate and the front interlocking driving plate which are installed on the hexagonal operation shaft press and drive the transverse sliding plate to slide in the direction away from the rotating axis, and the front interlocking driving plate finally abuts against and locks the transverse sliding plate, so that when the electric grounding switch is switched on, the transverse sliding plate is locked. And a vertical connecting rod of the crank arm connecting rod mechanism drives the guide rail interlocking mechanism downwards to lock the circuit breaker handcart, so that the interlocking requirement that the circuit breaker handcart cannot be pushed into a working position when the grounding switch is switched on is met.

The invention discloses a high-voltage metal-enclosed switchgear which comprises a cabinet body made of metal plates, the interior of the cabinet body is divided into a bus chamber for placing buses, a circuit breaker chamber for placing circuit breakers and a cable chamber for placing cables from top to bottom, and a vertical public pressure relief channel is arranged on the right side of the cabinet body. The center line of each corresponding upper contact box and the center line of each corresponding lower contact box are located on the same vertical axis, an upper contact arm and a lower contact arm of the circuit breaker are also located on the vertical axis and stretch out and draw back up and down, and the upper contact arm and the lower contact arm penetrate through the upper valve and the lower valve respectively. And the upper static contact and the lower static contact are respectively connected to form a conductive loop. According to the invention, the size is greatly reduced, the manufacturing cost is reduced, the current-carrying capability is improved, the discharge of the contact arm to the ground and air is effectively prevented, and the safety is better ensured.

This invention relates to a marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker. The top of the cabinet is equipped with pressure relief plates for arc relief channels in the circuit breaker compartment, busbar compartment, and cable compartment. The circuit breaker compartment houses a power electronic switch valve string unit; the diode valve string compartment and IGBT valve string compartment in the power electronic switch valve string unit are connected. The instrument compartment in the upper part of the cabinet houses secondary terminal blocks, circuit breakers, controllers, relays, integrated relay protection devices, fiber optic current transformer junction boxes, electromagnetic locks, and voltage transformers in the cable compartment. The cable compartment includes external copper busbars, current transformers, and voltage transformers. A live display device, voltage transformers, and current transformers are mounted on the busbars. The busbar compartment houses the main busbar and branch busbars. The main busbar connects each functional panel, and each functional panel uses a separate bus tie panel. This design reduces the space volume of the ship's main switchboard while fulfilling the measurement and protection functions of the medium-voltage DC power distribution device's bus tie panel.

An interlocking structure and switch cabinet with a one-button sequential control function. This solves the problem of low safety of existing switch cabinets that only rely on electrical interlocking. It includes a grounding switch, a vehicle body, a grounding operating shaft, a vehicle body operating shaft, a first drive mechanism and a second drive mechanism, a first microswitch, a second microswitch, a first interlocking mechanism and a second interlocking mechanism. The first interlocking mechanism has a first interlocking position and a second unlocking position. The second interlocking mechanism has a first interlocking position and a second unlocking position. When the grounding operating shaft operates the grounding switch to close, the first interlocking mechanism limits the second interlocking mechanism so that the second interlocking mechanism is in the first position. When the vehicle body operating shaft operates the vehicle body to move, the second interlocking mechanism limits the first interlocking mechanism so that the first interlocking mechanism is in the first position. The present invention has the advantages of reliable operation and high safety performance.

The utility model relates to the technical field of medium-voltage switch cabinets, and discloses an anti-misoperation structure of a grounding device of a medium-voltage switch cabinet, which comprises a fixed clamping ring, a connecting assembly movably mounted at one end of the fixed clamping ring, a universal slipknot fixedly mounted at one end of the connecting assembly, and a handcart blocking assembly movably mounted at one end of a stop block transmission assembly. The model number of a medium-voltage switch cabinet is KYN28-12, the fixing ring clamp is installed on a driving main shaft of a matched grounding JN15 of the switch cabinet, when the grounding device carries out switching-on operation, the fixing ring clamp rotates along with the grounding device, pushes the connecting long rod and pushes the inserting rod and the installation block to move through the universal slipknot, then the downwards-concave type stop block is vertically arranged to prevent a circuit breaker handcart from entering, and otherwise, the fixing ring clamp rotates along with the grounding device to push the inserting rod and the installation block to move through the universal slipknot. The fixing ring clamp rotates reversely, the connecting long rod is pulled, the inserting rod and the mounting block are driven through the universal slipknot, the concave stop block is horizontally arranged, a circuit breaker handcart can pass through the concave stop block, the thickness of the concave stop block is increased, a circuit breaker chassis can be effectively and directly blocked, and the circuit breaker is prevented from mistakenly transmitting power to a grounded switch cabinet.

The utility model relates to a centrally installed switchgear convenient for operating a circuit breaker. The centrally installed switchgear comprises a cabinet body and a circuit breaker moving mechanism. An instrument chamber, a circuit breaker chamber and a cable chamber are arranged in the cabinet body; the circuit breaker moving mechanism comprises a base, a lead screw, a moving seat and a circuit breaker; the base is arranged in the circuit breaker chamber; the lead screw is horizontally and rotatably arranged on the base and is arranged along the moving direction of the circuit breaker; the movable seat sleeves the lead screw in a threaded manner; the circuit breaker is mounted on the moving seat; an insertion hole is formed in the outer side end part of the lead screw; a circuit breaker joint is arranged in the cable chamber, and one end of the circuit breaker joint extends into the circuit breaker chamber and directly faces the circuit breaker; and the other end of the circuit breaker joint is provided with a plurality of copper bar interfaces. According to the utility model, the circuit breaker can be quickly and effectively operated to be switched on or switched off.

The invention provides an auxiliary handcart of a high-voltage switch cabinet, which comprises a handcart body, three moving contacts and three test terminals, and is characterized in that the three moving contacts are mounted at the front end of the handcart body in an insulating manner, and the three moving contacts are used for being in contact with the three static contacts when the handcart body is pushed into the high-voltage switch cabinet; the rear end of the vehicle body is provided with three test terminals in an insulated manner. Pressing wheels are arranged at the bottom of the trolley body and used for opening a lifting curtain for shielding a static contact when the trolley body is pushed into the high-voltage switch cabinet. According to the implementation mode, when insulation is measured, the three moving contacts are connected with the three test terminals through the insulated wires, and after the vehicle body is pushed into the high-voltage switch cabinet, the insulation is measured through the test terminals; during grounding, the three test terminals are detached, the three moving contacts and the grounding device are connected through a three-phase short-circuit grounding wire, and grounding is completed after the vehicle body is pushed into the high-voltage switch cabinet. During electricity testing, the three moving contacts and the three testing terminals are detached, and after the vehicle body is pushed into the high-voltage switch cabinet, electricity testing is completed.

The invention provides a switch cabinet maintenance interlocking method and a switch cabinet, and relates to the technical field of high-voltage electric appliances. The switch cabinet maintenance interlocking method comprises the steps that a grounding switch in a voltage transformer cabinet is connected to a main bus loop through a three-way contact box, a first lock bolt is arranged corresponding to the grounding switch, and second lock bolts are arranged on circuit breaker large panels of a wire inlet cabinet and a plurality of wire outlet cabinets respectively; after power failure, the second keys lock the corresponding circuit breakers at the experiment positions, the second keys are taken down and inserted into the key exchange box, the first key is unlocked and taken out, the second keys are locked in the key exchange box, the first key unlocks the first lock bolt, and the operating handle of the grounding switch is inserted and operates the grounding switch to be switched on. The main bus is in a grounding state; and then the switch cabinet is overhauled. According to the switch cabinet maintenance interlocking method and the switch cabinet, the safety and the reliability of power system maintenance operation can be improved.

The grounding switch and handcart protection locking device comprises a handcart arranged in a cabinet body and a main shaft used for controlling opening and closing, the handcart comprises a chassis movably installed in the cabinet body, the cabinet body is internally provided with a locking assembly linked with the chassis, the locking assembly comprises a shell, and the shell is internally provided with a grounding switch. A pressing arm linked with the chassis is rotatably arranged in the shell, the other end of the pressing arm is linked with a connecting rod, a limiting part is fixedly arranged on the main shaft, and the connecting rod is driven by the pressing arm to be locked with the limiting part so that the main shaft cannot rotate when the handcart moves to a station position. And when the handcart is at the test position, the connecting rod is unlocked from the limiting part, so that the main shaft can rotate.

The utility model discloses a grounding handcart with a front contact arm based on a KYN28 cabinet, which comprises a panel, a frame bending plate, a chassis and a primary contact arm, the panel and the frame bending plate are respectively and fixedly connected to the chassis, a set distance is formed between the panel and the frame bending plate along the propelling direction of the handcart, and the primary contact arm is arranged on the chassis. The frame bending plate is provided with a connection row used for installing the plurality of primary contact arms. According to the utility model, the panel, the frame bending plate and the chassis are transversely distributed, so that the primary contact arm is adjusted from the rear of the panel end to the front of the frame bending plate, the setting length of the primary contact arm is effectively reduced, the inclination of the contact arm is reduced, and the stability of the handcart is enhanced through the reinforcing structure of the angle plate and the reinforcing plate; the inclination condition of the handcart is further reduced, and the accurate butt joint of the primary contact arm and the static contact is ensured.

The application discloses a three-position operating mechanism for a high-voltage switch cabinet, comprising a first functional part, a second functional part and a lock position assembly; the lock position assembly comprises a rotating movable part; a limiting part and a bearing part are arranged on the two sides of the movable part respectively; the pair of movable parts cooperate to form an opening and closing structure, and the limiting parts and the bearing parts on the two movable parts are staggered and opposite to each other; the first functional part and the second functional part are arranged on the opposite sides of the lock position assembly respectively; the first functional part or the second functional part is in limiting cooperation with the limiting part during movement; the first functional part or the second functional part pushes away the bearing part during movement, drives the limiting part on the other side of the same movable part to be released from limiting; the first functional part and the second functional part need to reach the limiting position to unlock the other one, so that two-section control of the three-position switch is effectively realized, and the operation safety is remarkably improved.

The application relates to an electrical cabinet, and relates to the technical field of electrical cabinets, which comprises a cabinet body, the cabinet body is provided with a front cabinet door and a rear cabinet door, an operating mechanism and a triggering mechanism are arranged in the cabinet body, the operating mechanism comprises guide rails arranged in the cabinet body, a circuit breaker chassis vehicle in sliding connection with the guide rails, and a contact box arranged in the cabinet body, the triggering mechanism comprises a plurality of grounding switches, an insulating cover is arranged between adjacent grounding switches, insulating sleeves are arranged on the outer walls of the grounding switches and the contact box, the triggering mechanism further comprises a driving assembly and a valve interlocking assembly connected with the circuit breaker chassis vehicle, the driving assembly drives a guide rail interlocking assembly and a grounding interlocking assembly. The application can realize the effect that the cabinet body volume of the electrical cabinet is reduced, the components arranged in the cabinet body do not interfere with each other, and the electrical gap still meets the national standard.

The invention relates to the technical field of electrical machinery, in particular to an electricity testing and grounding integrated handcart, which comprises a main body mechanism, a chassis truck, a frame arranged on the chassis truck, an electricity testing contact arm arranged on the frame, a grounding switch arranged on the frame and an electromagnetic push rod arranged on the frame, the adjusting mechanism comprises a cutter fixing block arranged on the frame, a rotating piece arranged on the cutter fixing block and an adjusting piece arranged on the electromagnetic push rod; the start-stop mechanism comprises an abutting block arranged on the grounding switch, an ejection piece arranged on the frame, and a brake piece arranged on the frame; the frame is provided with a front plate, and the frame is provided with a back plate; the electromagnetic push rod comprises a push rod main body and a stop lever arranged on the push rod main body, so that the risk of high-voltage live-line short-circuit grounding is effectively avoided, and the problems of long consumed time and tedious working procedures of electricity testing grounding work are solved.

The application discloses a metal armored draw-out switch device and belongs to the technical field of switch devices. Mainly comprising a cabinet, an opening and closing assembly, the opening and closing assembly is provided with a bottom plate and a mounting cavity; a pushing assembly, the pushing assembly comprises two groups of insertion blocks, two groups of fixed boxes, an inner part of the fixed box is respectively provided with an insertion slot and a mounting slot; two groups of electric cylinders, the electric cylinder is installed in the inside of the mounting slot, the output end of the electric cylinder is provided with a gathering part; two groups of mounting plates, the mounting plate is installed on the inner wall of the mounting cavity, the mounting plate is provided with a sliding rail, one end of the sliding rail is provided with a lower smooth channel, one end of the lower smooth channel is provided with an inclined sliding channel, one end of the inclined sliding channel away from the lower smooth channel is provided with an upper smooth channel. The metal armored draw-out switch device can be separated from the bottom plate after the circuit breaker is closed, the screw rod structure in the bottom plate is prevented from being abraded, and the effect that the circuit breaker is separated from the bottom plate after being closed is achieved.

The invention relates to a mechanical locking device for working positions of an electric grounding switch and a handcart, which comprises an extended pressing plate fixedly connected to a chassis of the handcart, a steering stop block fixedly connected to a grounding interlocking large shaft, a mounting frame fixedly connected in a switch cabinet and a steering baffle plate hinged to the mounting frame, when the handcart is rocked to a working position, the steering baffle plate is pushed to swing through the extension pressing plate, so that the steering baffle plate swings to a swing path of the steering baffle plate when the handcart is switched on, and when the handcart is rocked out of the working position, the grounding interlocking large shaft drives the steering baffle plate to swing towards one side. The anti-misoperation switch cabinet has the advantages that the anti-misoperation capability of the switch cabinet is enhanced, the operation safety of equipment is improved, the structure is simple, the action is reliable, an additional power source is not needed, the maintenance is convenient, the defect that the switch cabinet purely depends on electrical interlocking in the prior art is effectively overcome, and the safety of the switch cabinet is improved. And a dual protection mechanism is provided for the high-voltage switch cabinet.

The invention relates to the technical field of grounding wire clamps, and discloses a short-circuit grounding wire clamp for an obstacle-crossing middle-mounted circuit breaker cabinet, and the short-circuit grounding wire clamp comprises a wire clamp main body, an operating rod, a duplex universal joint, an orientation rod, and a rotating rod. The wire clamp main body is provided with an adjusting rod capable of rotating to adjust the opening size of the wire clamp; the operating rod is connected with the adjusting rod through the duplex universal joint, so that the operating rod can drive the adjusting rod to rotate when rotating, and the operating rod can rotate relative to the adjusting rod; the directional rod is fixedly connected with the wire clamp main body; one end of the rotating rod is connected with the operating rod, and the other end is rotatably connected with the orientation rod; a tightness adjusting piece is arranged on the rotating rod; the tightness adjusting piece can limit the rotation of the rotating rod relative to the directional rod when tightened. The short-circuit grounding wire clamp provided by the scheme can be adapted to middle circuit breaker cabinets of different models, the grounding wire clamp can be rapidly hung, the operation difficulty is reduced, and the operation efficiency is improved.

The present invention relates to an interlocking and unlocking device for a main switch trolley and a grounding switch of a switchgear (100, 200), and a switchgear comprising the interlocking and unlocking device. The interlocking and unlocking device comprises an interlocking mechanism and an unlocking mechanism. The interlocking mechanism comprises a first engaging member (12, 207) arranged on an operating shaft (15, 208) of the grounding switch so as to rotate therewith, a second engaging member (10, 209) adapted to engage with or disengage from the first engaging member, and a limiting assembly (101, 2101) arranged at a guide rail of the main switch trolley and capable of limiting the main switch trolley. The second engaging member moves in linkage with the limiting assembly, to realize interlocking of the main switch trolley and the operating shaft when the first engaging member and the second engaging member are in an engaged state. The unlocking mechanism is able to disengage the two members from each other to realize unlocking of the grounding switch and the main switch trolley. The device is able to realize interlocking, and also able to release the interlocking relationship therebetween as required while meeting safety requirements, thus improving testing efficiency and saving labor.

The invention discloses a mining high-voltage power distribution device, and particularly relates to the technical field of mining power distribution equipment, and the mining high-voltage power distribution device comprises a bevel gear transmission grounding knife, an incoming line contact shielding protection mechanism, a grounding knife copper bar connecting structure, a platform connecting structure, a front door locking mechanism, a rear door locking mechanism, a chassis vehicle and grounding knife locking mechanism, and an overhaul hanging coded lock mechanism. The action reliability of the grounding knife is improved through bevel gear transmission, the incoming line contact shielding protection mechanism realizes physical isolation protection, the copper bar connection ensures the grounding effectiveness, the connection platform structure optimizes the installation space and expansibility, and the front and rear door locking mechanism perfects the safety protection. The operation stability, the operation safety and the adaptability of the mining high-voltage power distribution device are remarkably improved, and the high-reliability and high-safety requirements of a mining power distribution system are met.

The utility model relates to the technical field of special equipment for switching devices, in particular to a grounding electricity testing trolley. The grounding electricity testing trolley comprises a chassis vehicle and a frame installed on the chassis vehicle, the frame is provided with a guiding sliding rail along the longitudinal direction, a contact arm installation beam is installed on the guiding sliding rail in a guiding mode, contact arms are arranged on the contact arm installation beam, the contact arms are communicated through a diversion row, and a grounding device is arranged on the chassis vehicle. The top of the frame is provided with a hoisting mechanism which is used for adjusting the contact arm mounting beam up and down so as to adjust the contact arm mounting beam to an upper grounding position and a lower grounding position. According to the utility model, the lifting mechanism is arranged at the top of the frame, so that the lifting adjusting mechanism of the grounding electricity testing trolley is simple in structure and convenient to install.

The utility model discloses a grounding knife interlocking mechanism of a switch cabinet. The grounding knife interlocking mechanism comprises an operation shaft, a front door interlocking assembly and a rear door interlocking assembly. The rear door interlocking assembly comprises a rear door mounting plate, a clutch assembly and a transmission assembly, the clutch assembly comprises a main shaft sleeve and a slave shaft sleeve, the main shaft sleeve movably sleeves one end of the operation shaft, the slave shaft sleeve is fixedly sleeved on the operation shaft, and the slave shaft sleeve is connected with the electric grounding knife switch main shaft through the transmission assembly; the front door interlocking assembly comprises a support assembly, a small valve, a handcart interlocking assembly, a padlock assembly and a first elastic piece; the other end of the operation shaft is rotatably installed on the support assembly, the small valve is installed on the support assembly in a sliding mode, the handcart interlocking assembly is installed on the lower portion of the small valve, the padlock assembly is located in the middle of the small valve, and the two ends of the first elastic piece are connected with the small valve and the support assembly respectively and used for pulling the small valve upwards to a preset position. The utility model has the advantages of simple structure, reliable work and the like.

The utility model discloses a breaker five-prevention electrical interlock, comprising a mounting rack arranged on a breaker handcart, the mounting rack is provided with a grounding spring bolt and a microswitch used for controlling on-off of a handcart electric operation propulsion mechanism, and the microswitch is fixedly connected with the mounting rack. An extension position and a retraction position which are used for locking and unlocking the closing action of the grounding switch are respectively arranged in the action stroke of the grounding spring bolt, the grounding spring bolt disconnects the microswitch under the extension position, and the grounding spring bolt triggers the microswitch under the retraction position. According to the utility model, the interlocking structure of the grounding spring bolt, the slide block support and the microswitch is adopted, and through a set of linked interlocking structure, the electrical five-prevention requirements of a manual operation mechanism and an electric operation mechanism are simultaneously met, the structural complexity in the cabinet is effectively simplified, and the maintenance difficulty is reduced.

The present invention relates to an apparatus 202 and method for monitoring a mobile grounding device 102. The apparatus 202 comprises a first pole 204 for connection to the mobile grounding device 102, a second pole 206 for connection to a reference probe 208, and a control device. The control device is configured to sense an electrical resistance between the first pole 204 and the second pole 206 and compare it with a threshold value. The control device outputs a status signal based on the comparison between the electrical resistance and the threshold value.

The utility model belongs to the technical field of switch cabinets, and particularly relates to a switch cabinet grounding interlocking structure which comprises a side plate, a handcart guide rail, a grounding operation shaft and a handcart interlocking shaft, the handcart interlocking shaft is provided with a limiting rod and a limiting block, the operation end of the grounding operation shaft is slidably assembled with a baffle plate, the baffle plate is linked with the handcart interlocking shaft through a linkage small crank arm, and the handcart interlocking shaft is connected with the handcart guide rail. The handcart interlocking shaft is rotationally connected with the linkage small crank arm through the connecting rod, the baffle moves up and down to drive the handcart interlocking shaft to rotate, the limiting rod and the limiting block stretch out or retract, and therefore movement of the handcart is locked or unlocked, equidistant assembling holes are formed in the two ends of the linkage small crank arm, the length of a force arm can be adjusted through hole position switching, and the handcart interlocking device is suitable for handcarts of different specifications. Linkage is achieved only through the small linkage connecting lever and the connecting rod, transmission parts are reduced, installation efficiency is improved, raw material purchasing, labor and operation and maintenance cost is reduced, the problems that in the prior art, the structure is complex, cost is high, installation is tedious and the like are effectively solved, and remarkable engineering application value is achieved.

This utility model discloses a grounding trolley interlocking device for switchgear, relating to the field of high-voltage switch technology. It includes a first interlocking circuit and a second interlocking circuit. The first interlocking circuit is installed inside the PT cabinet and includes a small busbar KM at the top of the cabinet. The positive terminal of the small busbar KM is sequentially connected to a first miniature circuit breaker 3DK, the grounding trolley in its non-working position 1S9, and the positive terminal of the signal busbar BSM. The negative terminal of the small busbar KM is sequentially connected to the first miniature circuit breaker 3DK and the negative terminal of the signal busbar BSM. The second interlocking circuit is installed inside the switchgear cabinet. This utility model prevents on-site personnel from mistakenly pushing the grounding trolley into the working position when all trolleys in the switchgear are in the test position, causing a tripping incident; it also prevents electrical misoperation and avoids power accidents.

This invention relates to the field of switchgear, and particularly to a preventive interlocking device for a floor switch trolley. It includes a side plate with a front folding plate and an operating hole. A guide rail is fixedly mounted on the side plate, and the guide rail has two through holes. Retractable movable blocks are respectively installed in the two through holes. A sliding plate is vertically slidably connected to the front folding plate. An interlocking assembly is connected between the sliding plate and the two movable blocks, and the interlocking assembly drives the two movable blocks to simultaneously protrude from the two through holes of the guide rail. A mounting plate is fixedly mounted in the side plate, and an operating shaft is rotatably connected to the mounting plate. A main shaft is rotatably mounted relative to the mounting plate next to the operating shaft. A transmission mechanism is connected between the operating shaft and the main shaft, allowing the operating shaft to extend and retract along its axial direction. This invention has high reliability and will not damage the components in the interlocking mechanism.

The utility model belongs to the technical field of electrical equipment, and discloses an interlocking device of a three-station isolating switch and a cabinet door, which comprises the three-station isolating switch, the cabinet door, a first interlocking structure and a second interlocking structure. The three-position isolating switch is installed in the high-voltage switch cabinet and is provided with an operation interface, a valve and a main shaft. The cabinet door is arranged on the high-voltage switch cabinet in an openable manner, and the upper end of the cabinet door is overlapped with part of the connecting cross beam. A first limiting sliding groove is formed in the cabinet door, and a moving-out opening is formed in the groove wall of the lower side of the first limiting sliding groove. The first interlocking structure is arranged between the valve and the cabinet door, and the second interlocking structure is arranged between the main shaft and the connecting cross beam. The interlocking device of the three-position disconnecting switch and the cabinet door can fully ensure the opening safety of the cabinet door and effectively reduce potential safety hazards.