Device for preventing signal points of medium-voltage switch cabinet and grounding handcart from being touched by mistake

Abstract

A device for preventing signal points of a medium-voltage switch cabinet and a grounding handcart from being touched by mistake comprises the medium-voltage switch cabinet and the grounding handcart, a handcart baffle used for installing a microswitch support and an aviation socket support used for installing an aviation socket are arranged on the top of a handcart chamber of the medium-voltage switch cabinet, and a plurality of microswitches are arranged on the microswitch support. Each microswitch is respectively connected with an output terminal strip of the medium-voltage switch cabinet and is used for transmitting tripping signals, the position height of the microswitches is higher than the height of the grounding handcart, the upper end face of the grounding handcart is provided with a microswitch pressing plate, and the microswitch pressing plate is used for pressing the microswitches to enable the tripping signals to be communicated. The grounding handcart is provided with an aviation plug, and the aviation plug is provided with an insertion core which is used for being connected with a power signal and is matched with the aviation socket to transmit the power signal. The problems of limited system functions caused by few signal transmission points of the medium-voltage switch cabinet and signal interference between a grounding handcart and the medium-voltage switch cabinet during maintenance and repair of a power distribution system are solved.

Description

Technical Field

[0001] The utility model relates to the field of switch cabinets, and particularly relates to an anti-misoperation touch device for signal points of a medium-voltage switch cabinet and an earthing trolley. Background Art

[0002] In a medium-voltage power supply and distribution system, a set of medium-mounted switch cabinets and draw-out switch cabinets are often configured with one (or more) earthing trolleys for maintenance or repair. During equipment maintenance, the PT trolley (fuse trolley) used when the switch cabinet is operating normally is withdrawn, and then the earthing trolley is pushed into the working position to connect the earthing trolley to the main busbar of the switch cabinet, short-circuiting the three phases of the main busbar to the ground to complete the release of residual electricity. To prevent accidents caused by accidentally closing the circuit breaker of the switch cabinet during maintenance, trip signals for circuits such as the main incoming circuit breaker and the tie cabinet circuit breaker are also provided on the earthing trolley. These trip signals are interlocked with the circuit breaker trip circuits of the main incoming switch cabinet and the tie switch cabinet through aviation plug sockets to ensure the safety of maintenance personnel during the maintenance of the switch cabinet.

[0003] In a switch cabinet system, the earthing trolley often cooperates with the aviation socket on the corresponding switch cabinet through an aviation plug to achieve the transmission of trip interlock signals. However, in practical applications, due to the limited number of pins on the aviation plug, generally 58 cores, the signal transmission points are restricted, resulting in the loss of some signals. Especially with the digital transformation and intelligent upgrade of switch cabinets, the demand for the number of signals has increased significantly, and the number of cores of the aviation plug can no longer meet the signal quantity requirements, seriously affecting the system design of the switch cabinet; although using relays to expand through the aviation plug can relieve the pressure of using the aviation plug to a certain extent, this method will cause signal chaos after the switch cabinet control power is cut off, resulting in a conflict between the aviation plug signals on the earthing trolley and the aviation socket signals of the original cabinet, causing false alarms in the power distribution system and low reliability. Summary of the Invention

[0004] The purpose of the utility model is to provide an anti-misoperation touch device for signal points of a medium-voltage switch cabinet and an earthing trolley to solve the problems of limited system functions caused by few signal transmission points in the medium-voltage switch cabinet and signal interference between the earthing trolley and the medium-voltage switch cabinet during the maintenance and repair of the power distribution system.

[0005] The object of the utility model is achieved by the following solution: A device for preventing misoperation of signal points between a medium-voltage switchgear and an earthing trolley, comprising a medium-voltage switchgear and an earthing trolley. At the top of the trolley compartment of the medium-voltage switchgear, there are a trolley baffle for installing a microswitch bracket and an aviation socket bracket for installing an aviation socket. A plurality of microswitches are arranged on the microswitch bracket, and each microswitch is respectively connected to the output terminal block of the medium-voltage switchgear for transmitting a trip signal. The position height of the microswitch is higher than the height of the earthing trolley. A microswitch pressure plate is arranged on the upper end face of the earthing trolley, and the microswitch pressure plate is used to press the microswitch to connect the trip signal. An aviation plug is arranged on the earthing trolley, and the aviation plug is provided with a core for connecting a power signal to cooperate with the aviation socket to transmit the power signal. It solves the problems that the number of signal transmission points of the medium-voltage switchgear is small, resulting in limited system functions, and signal interference between the earthing trolley and the medium-voltage switchgear during the maintenance and repair of the power distribution system.

[0006] Preferably, guide rails are provided on the left and right side walls at the lower part of the trolley compartment of the medium-voltage switchgear. A chassis trolley is arranged at the lower part of the earthing trolley, and rollers are arranged on the left and right sides of the chassis trolley. The rollers are in rolling cooperation with the guide rails.

[0007] Further preferably, the chassis trolley is provided with a propulsion mechanism, and the propulsion mechanism rotates the rollers through an operating handle.

[0008] Still further preferably, the operating handle operates the propulsion mechanism through an operating hole at the front end of the chassis trolley.

[0009] Preferably, the medium-voltage switchgear includes a busbar chamber located at the upper rear part, an instrument chamber located at the upper front part, a trolley chamber located at the middle front part, a front cable chamber located at the lower front part, and a primary cable chamber located at the lower rear part.

[0010] Preferably, the trip signal includes a trip signal for the main incoming line circuit breaker and a trip signal for the tie cabinet circuit breaker.

[0011] The utility model installs multiple microswitches on the microswitch bracket of the medium-voltage switch cabinet, which are used to transmit tripping signals, disperse signal transmission points, effectively relieve the use pressure of the aviation socket, and at the same time avoid false alarms caused by signal interference problems during the maintenance and repair of the power distribution system; connecting multiple microswitches to the output terminal block without damaging the original signal system can greatly reduce costs; when the grounding trolley is pushed into the working position, the tripping signal can be triggered by the cooperation of the microswitch pressure plate on the grounding trolley and multiple microswitches, ensuring the tripping signal operation of circuits such as the main incoming line circuit breaker and the tie cabinet circuit breaker, guaranteeing the safety of maintenance personnel, with a simple structure and convenient operation, and further reducing costs; multiple microswitches are installed and fixed on the medium-voltage switch cabinet through the microswitch bracket, and the number of microswitches can be expanded according to user needs, with strong versatility, meeting the requirements for signal points in the digital transformation and intelligent upgrade of the switch cabinet, the signal transmission points will not be restricted, and problems such as signal loss are avoided.

[0012] The following further describes the present utility model in conjunction with the specification drawings and specific embodiments. Description of the Drawings

[0013] Figure 1 It is a working state diagram of the grounding trolley of the present utility model not pushed into the trolley room;

[0014] Figure 2 is Figure 1 an enlarged view of the F position in;

[0015] Figure 3 It is a working state diagram of the grounding trolley of the present utility model located at the experimental position;

[0016] Figure 4 is Figure 3 an enlarged view of the E position in;

[0017] Figure 5 It is a working state diagram of the grounding trolley of the present utility model located at the working position;

[0018] Figure 6 is Figure 3 an enlarged view of the D position in;

[0019] Figure 7 It is a front view of the cooperation state of the grounding trolley and the medium-voltage switch cabinet of the present utility model;

[0020] Figure 8 It is a structural schematic diagram of the medium-voltage switch cabinet of the present utility model;

[0021] Figure 9 It is a structural schematic diagram of the grounding trolley of the present utility model;

[0022] Figure 10 It is a front view of the grounding trolley of the present utility model;

[0023] Figure 11 This is the top view of the earthing trolley of the present utility model;

[0024] Figure 12 This is the side view of the earthing trolley of the present utility model. Detailed implementation manners

[0025] Refer to Figures 1 to 12 , a misoperation prevention device for signal points of a medium-voltage switchgear and an earthing trolley. At the top of the trolley compartment 14 of the medium-voltage switchgear 1, there are a trolley baffle 141 for installing a microswitch bracket 16 and an aviation socket bracket 142 for installing an aviation socket 19. A plurality of microswitches 18 are arranged on the microswitch bracket 16. Each microswitch 18 passes through a through hole 144 on the trolley baffle 141 and is respectively connected to the output terminal block of the medium-voltage switchgear 1 for transmitting trip signals. The trip signals include the trip signal of the main incoming line breaker circuit and the trip signal of the tie cabinet breaker circuit. The position height of the microswitch 18 is higher than the height of the earthing trolley 2. A microswitch pressing plate 21 corresponding to the microswitch 18 is arranged on the upper end surface of the earthing trolley 2 for pressing the microswitch 18. An aviation plug 26 is arranged on the earthing trolley 2. The aviation plug 26 is provided with two plug cores for mating with the aviation socket 19 to connect the power supply and transmit the power supply signal. The existing technology of using the plug cores on the aviation plug to transmit trip signals and power supply signals is changed to only retaining two plug cores for transmitting power supply signals for the PT trolley (fuse trolley) to jointly use the power supply signal point, and the pins for transmitting trip signals are connected to the output terminal block through the microswitch, and the microswitch pressing plate is used in cooperation with the microswitch to transmit the trip signal; by dispersing the signal points of the aviation socket through the microswitch, the signal misoperation caused by too many signal transmission points of the aviation socket is avoided, and the installation position height of the microswitch is higher than the height of the earthing trolley 2. Except for the microswitch pressing plate, other parts of the earthing trolley 2 will not touch and trigger the microswitch, and the safety is high. A plurality of microswitches are installed and fixed on the medium-voltage switchgear through the microswitch bracket, and the number of microswitches can be expanded according to user needs to increase the signal transmission points. These signal transmission points are not connected to the interlock points of the switchgear through the aviation plug, and will not damage the original signal system, the modification cost is small, and the universality is strong.

[0026] On the left and right side walls of the lower part of the trolley compartment 14 of the medium-voltage switchgear 1, there are guide rails 143. A chassis trolley 23 is arranged at the lower part of the earthing trolley 2. Roller wheels 231 are arranged on the left and right sides of the chassis trolley 23. The roller wheels 231 are in rolling cooperation with the guide rails 143. The chassis trolley 23 is provided with a propulsion mechanism. The propulsion mechanism rotates the roller wheels 231 through an operating handle 3. The operating handle 3 operates the propulsion mechanism through an operating hole 22 at the front end of the chassis trolley 23.

[0027] The medium voltage switch cabinet 1 comprises a busbar room 11 at the upper rear part, an instrument room 13 at the upper front part, a trolley room 14 at the middle front part, a front cable room 15 at the lower front part, and a primary cable room 12 at the lower rear part.

[0028] Working principle: When the medium-voltage switch cabinet 1 is operating normally, the grounding trolley 2 is not pushed in, and the micro switches 18 located in the trolley chamber 14 do not operate and cannot transmit the trip signal; when the medium-voltage switch cabinet 1 is being repaired, the grounding trolley 2 is transferred by moving the transfer trolley 4, and the grounding trolley 2 is pushed into the trolley chamber 14 of the medium-voltage switch cabinet 1, and the grounding trolley 2 is supported and guided by the rollers 231 of the chassis trolley 23 at the bottom of the grounding trolley 2 and the guide rails 143 on both sides of the trolley chamber 14. When the grounding trolley 2 reaches the experimental position of the trolley chamber 14, that is, the grounding trolley 2 enters the trolley chamber 14 but the plum blossom contact 27 does not contact the medium-voltage switch cabinet, the transfer trolley 4 is removed and the grounding trolley 2 is moved. The aviation plug 26 on the grounding trolley 2 is inserted into the aviation socket 19 on the medium-voltage switch cabinet 1, and then the operating handle 3 is inserted into the chassis trolley 23 and shaken. By turning the operating handle 3, the roller 231 continues to rotate along the guide rail 143, and the grounding trolley 2 is controlled to move inside the trolley room 14, so that the grounding trolley 2 reaches the working position of the trolley room 14, that is, the plum blossom contact 27 contacts the medium-voltage switch cabinet 1. At this time, the micro switch pressure plate 21 on the grounding trolley 2 applies pressure to the micro switch 18 on the medium-voltage switch cabinet 1, and multiple micro switches 18 are closed, and the trip signal is output to ensure that the trip signal of the main incoming line circuit breaker, the contact cabinet circuit breaker and other circuits works, and ensure the safety of the maintenance personnel. After the grounding trolley 2 is finished, the aviation plug 26 is unplugged, the operating handle 3 is shaken in the opposite direction, and the grounding trolley 2 moves out of the cabinet and returns to the experimental position, and the micro switch is disconnected. When the grounding trolley 2 exits the trolley room, the grounding trolley 2 is removed by the transfer trolley 4.

[0029] When the medium voltage switch cabinet 1 operates normally, it works in conjunction with the PT trolley. The height of the PT trolley is the same as that of the grounding trolley 2, and there is no microswitch pressure plate on the upper end of the PT / fuse trolley, which will not contact the microswitch, avoiding false touch of the trip signal, and has high reliability and safety.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A misoperation prevention device for signal points of a medium-voltage switchgear and an earthing trolley, comprising a medium-voltage switchgear (1) and an earthing trolley (2), characterized in that: At the top of the handcart chamber (14) of the medium-voltage switchgear cabinet (1), there are a handcart baffle (141) for installing a microswitch bracket (16) and an aviation socket bracket (142) for installing an aviation socket (19). A plurality of microswitches (18) are arranged on the microswitch bracket (16), and each microswitch (18) is respectively connected to the output terminal block of the medium-voltage switchgear cabinet (1) for transmitting a trip signal. The position height of the microswitch (18) is higher than the height of the grounding handcart (2). A microswitch pressure plate (21) is arranged on the upper end face of the grounding handcart (2), and the microswitch pressure plate (21) is used to press the microswitch (18) to connect the trip signal. An aviation plug (26) is arranged on the grounding handcart (2), and the aviation plug (26) is provided with a core for connecting a power signal to cooperate with the aviation socket (19) to transmit the power signal.

2. The anti-misoperation device for the medium-voltage switchgear and grounding trolley signal points according to claim 1, wherein Guide rails (143) are provided on the left and right side walls at the lower part of the handcart chamber (14) of the medium-voltage switchgear cabinet (1). A chassis trolley (23) is arranged at the lower part of the grounding handcart (2), and rollers (231) are arranged on the left and right sides of the chassis trolley (23). The rollers (231) are in rolling cooperation with the guide rails (143).

3. The anti-misoperation device for the medium-voltage switchgear and grounding trolley signal points according to claim 2, wherein, The chassis trolley (23) is provided with a propulsion mechanism, and the propulsion mechanism rotates the rollers (231) through an operating handle (3).

4. The anti-misoperation device for the medium-voltage switchgear and grounding trolley signal points according to claim 3, characterized in that, The operating handle (3) operates the propulsion mechanism through an operating hole (22) at the front end of the chassis trolley (23).

5. The anti-misoperation device for the medium-voltage switchgear and grounding trolley signal points according to claim 1, characterized in that The medium-voltage switchgear cabinet (1) includes a busbar chamber (11) located at the upper rear part, an instrument chamber (13) located at the upper front part, a handcart chamber (14) located at the middle front part, a front cable chamber (15) located at the lower front part, and a primary cable chamber (12) located at the lower rear part.

6. The anti-misoperation device for the medium-voltage switchgear and grounding trolley signal points according to claim 1, characterized in that, The trip signal includes a main incoming line circuit breaker trip signal and a tie cabinet circuit breaker trip signal.

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