CN105470010A - Electric control apparatus for isolation switch - Google Patents

Abstract

The invention discloses an electric control device for an isolating switch, which is composed of a motor, a reducer and two sets of action executing mechanisms. The motor drives the rotating shaft arranged in the middle of the two groups of action actuators to rotate through the reducer, and one end of the rotating shaft is provided with a connector to connect with the high-voltage isolating switch. The action actuator includes a miniature air circuit breaker fixed on the support plate. The support body fixed with the support plate is provided with a guide post. There is a guide rod on the slider slidingly matched with the guide post. , One side of the slider is provided with a dial, the top of the slider limit screw is provided with a limit head, the other end of the rotating shaft has a dial protruding from the shaft side, and the dial is press fit with the guide rod on the slider. The motor drives the rotating shaft to rotate in the forward and reverse directions, and the guide rod moves the slider up and down along the guide column under the pressure of the shift block and the return spring. The circuit breaker is turned off, thereby realizing remote control of the disconnector.

Description

An electric control device for an isolating switch

technical field

The invention relates to a switch control device, in particular to a remote control device for a catenary high-voltage isolating switch.

Background technique

High-voltage isolating switch is an important switching device in power plants, substations, and railway catenary electrical systems. Its main function is to ensure the safety of high-voltage electrical appliances and devices during maintenance work, and to isolate voltage. Most of the isolating switch operating mechanisms use electrical components such as contactors and relays to realize the forward and reverse switching of the motor. The remote control opening and closing commands trigger the electric operating mechanism with narrow pulses. The opening and closing of the switch. The remote control command adopts the optical fiber transmission mode, and the conventional optical fiber control mode misoperation, refusal to operate, and false display of faults occur from time to time, which makes the railway catenary power supply and distribution system a potential safety hazard. The electric operating mechanism of the isolating switch disclosed in the prior art is composed of one power supply and a remote control circuit. The control circuit only gives the opening and closing signal - a narrow pulse, and the functions of the electric operating mechanism, such as forward and reverse and stop in place, are all completed inside the electric operating mechanism. Due to the large high-order harmonics of the high-speed railway, the control circuit of the electric operating mechanism is very long, and the control pulse is very narrow, so clutter is often induced in the control circuit, causing the electric operating mechanism to malfunction, refuse to operate, and display incorrectly. In order to overcome the defects of the existing electric operating mechanism, a new type of electric operating device is urgently needed.

Contents of the invention

The object of the present invention is to provide an electric control device for a disconnector, which solves the problems of malfunction, refusal to operate and false display in the existing electric control device. The position detection sensor directly controls the strong current, which reduces the control links and improves the reliability of the control.

The invention is an improvement on the basis of the existing electric control device of the isolating switch. Specifically, an electric control device for a disconnector provided by the present invention is composed of a motor, a reducer and two sets of action actuators. The motor drives the rotating shaft to rotate through the reducer. The rotating shaft is set in the middle of the two sets of action actuators. One end of the rotating shaft is provided with a connector for connecting with the high-voltage isolating switch. The action actuator includes a miniature air circuit breaker fixed on the support plate. The supporting body fixedly connected to the support plate is provided with a guide post, and a guide rod is provided in the middle of the slider that is slidably matched with the guide post, and a return spring is installed at the lower end of the guide rod. The shifting plate for turning off the fork, the top of the limit screw fixed vertically to the support body and slidingly connected with the slider is provided with a limit head, the shaft head of the rotating shaft is provided with a shifting block that is firmly connected with the rotating shaft and protrudes from the side of the shaft. The shifting block is press-fitted with the guide rod in the middle of the slide block.

The working process of the electric control device of the present invention is like this. The motor drives the rotating shaft to rotate through the reducer, and the shifting block on the rotating shaft rotates together with the rotating shaft. When the shifting block on the rotating shaft rotates to contact the sliding block guide rod on the actuator on one side, under the pressure of the shifting block, the guide rod drives The slider moves down along the guide column, and at the same time, the dial on the side of the slider pulls down the micro-break fork on the miniature air circuit breaker to disconnect it, cut off the power supply of the motor, the electric control device stops, and one end of the shaft The connector controls the closure of the high voltage isolating switch. Give the motor a reverse rotation command, and the dial on the slider moves upward along the guide post under the elastic force of the return spring, and the dial moves the micro-break fork on the miniature air circuit breaker to close. The shifting block on the rotating shaft continues to rotate until the miniature circuit breaker on the action actuator on the other side is disconnected, the motor power is cut off, and the mechanism reverses to complete, thereby realizing the purpose of controlling the electric control device.

The electric control device of the present invention realizes the control of the mechanism by controlling the power circuit, so the anti-interference ability is strong; the control logic can be easily realized by adopting the limit switch with the capacity of breaking the load. The electric control device is divided into two power supplies, one for driving the motor forward and one for driving the motor in reverse. The two circuits are connected to the motor in parallel through two miniature air circuit breakers. When the isolating switch is opened and closed in place, the electric control device disconnects the micro-break fork through the dial to stop the motor, so that the electric control device drives the isolating switch to start and stop accurately. The remote control unit and control protection unit of the electric control device of the isolating switch are arranged indoors, and no electrical protection device is installed separately in the mechanism box. In order to avoid tripping of the miniature circuit breaker due to motor stalling, the tripping current of the circuit breaker is much greater than the rated current of the motor, and the indoor control and protection unit is preferentially activated to reduce the workload of on-site maintenance. In this way, the problems of misoperation, refusal to operate and false display of the isolating switch can be effectively solved.

The electric control device of the isolating switch of the present invention is especially used for the control of the electric isolating switch of the high-speed railway catenary network, and realizes the remote direct control of the high-voltage electric isolating switch of the high-speed railway catenary. It solves faults such as false operation, refusal to operate, and false display of the isolating switch, reduces the failure rate of the railway power supply and distribution system, and provides guarantee for the stability of the high-voltage line operation.

The beneficial effects obtained by the present invention are as follows: the electric control device can conveniently realize the remote direct control scheme of the high-voltage isolating switch. It solves the faults of isolating switch malfunction, refusal to operate, and false display, especially for the control of electric isolating switches of high-speed railway catenary, which reduces the failure rate of railway power supply and distribution systems and provides favorable guarantees for the stability of high-voltage line operations.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic diagram of the control principle of the present invention.

The meanings of the symbols in Figure 1 are as follows:

1. Motor 2, connector 3, reducer 4, support plate 5, miniature air circuit breaker 6, dial plate 7, micro-break fork 8, limit head 9, limit screw 10, return spring 11, support body 12 , guide post 13, slide block 14, guide rod 15, dial block 16, rotating shaft.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, an electric control device for a disconnector is composed of a motor 1, a reducer 3 and two sets of actuators. The reducer 3 is fixed on the support plate 4, and the motor 1 drives the rotating shaft 16 to rotate through the reducer 3. The rotating shaft 16 is arranged in the middle of the two groups of action actuators, and the left end of the rotating shaft is provided with a connector 2 for connecting with a high-voltage isolating switch. The action actuator includes a miniature air circuit breaker 5 fixed on the support plate 4, and its model is S202MDC, which is a commercially available product and is produced by ABB Company of Sweden. The support body 11 fixedly connected with the support plate is provided with a vertical circular guide post 12, and a guide rod 14 is provided in the middle of the slide block 13 slidingly matched with the guide post 12, and the guide rod 14 protrudes above and below the slide block 13, and Tightly connected with the slider 13, the lower end of the guide rod 14 is equipped with a slider return spring 10, the return spring 10 is installed on the outside of the guide rod 14, between the support body 11 and the slider, and the slider shrinks when it moves downward . The left side of the slider 13 is provided with a "U"-shaped dial 6 for driving the miniature air circuit breaker 5 micro-break fork 7 to turn off, and a limit screw 9 vertically fixed to the support body 11 and slidably connected to the slider. The top is provided with a limit head 8, and the shaft head at the right end of the rotating shaft 16 is provided with a "V"-shaped shifting block 15 that is firmly connected with the rotating shaft and protrudes from the side of the shaft. 14 Press fit.

Its working process is described as follows: the motor 1 rotates forward, and the rotating shaft 16 is driven to rotate forward by the deceleration shaft 3. The "V"-shaped shift block 15 rotates with the rotating shaft 16, and the action on the side of the rotating shaft 16 is the guide rod of the slider 13 of the actuator. 14 Under the pressure of the dial block 15, the slider 13 and the "U"-shaped dial 6 are moved downward along the guide column 12, and the "U"-shaped dial 6 is moved down during the downward movement of the miniature air circuit breaker 5. The micro-break shift fork 7 disconnects the miniature air circuit breaker, cuts off the power supply of the motor 1, the forward rotation of the mechanism is completed, and the isolating switch is closed. At the same time, the return spring 10 at the lower end of the guide rod 14 is compressed and contracts. Give the motor 1 a reverse rotation command, the rotating shaft rotates reversely, and the "V"-shaped shifting block 15 disengages the guide rod 14 on the slider 13 when it rotates reversely with the rotating shaft 16, and the shifting plate 6 follows the sliding block 13 in the return spring Under the elastic force of 10, it moves upward along the guide column 12, and the dial 6 moves the micro-break fork 7 on the miniature air circuit breaker 5 to close, and the rotating shaft 16 drives the "V"-shaped shift block 15 to continue to rotate until the micro-break on the other side The device is disconnected, the power supply of motor 1 is cut off, the execution of the motion actuator on the other side is completed, and the isolation switch is opened.

The control principle of the present invention is shown in Fig. 2. Press the button SB1 and the motor 1 runs forward, the motor drives the rotating shaft 16 to rotate forward through the transmission 3, the shifting block 15 rotates with the rotating shaft 16, the shifting block 15 presses the guide rod 14 to drive the slider 13 and the shifting plate 6 to move downward, and the shifting Board 6 moves the micro-break fork 7 on the miniature air circuit breaker to move down, QS1 disconnects the circuit, motor 1 stops, and the closing process is completed. Release the button SB1 and press the button SB2, the motor 1 reverses, and the reducer 3 drives the rotating shaft 16 to rotate in the reverse direction, first release the micro-break shift fork 7 on the miniature air circuit breaker 5 that detects the forward rotation, and the shift plate 6 passes through the return spring 10 With the slide block 13 resetting, the micro-break shift fork 7 gets back to the closed state, and is ready for forward rotation again. The rotating shaft 16 drives the shifting block 15 to continue to rotate until the miniature circuit breaker on the other side is disconnected, QS2 disconnects the circuit, and the motor 1 stops to complete the opening process.

Claims (3)

1. the electric controller of an isolating switch, structure comprises motor (1), be fixed on the decelerator (3) in supporting bracket (4), characterized by further comprising two groups of action actuating mechanisms, rotating shaft (16) is located at the centre of two groups of action actuating mechanisms, motor 1 drives rotating shaft (16) to rotate by decelerator (3), rotating shaft left end is provided with connector (2) and is connected with high voltage isolator, action actuating mechanism comprises the miniature air circuit breaker (5) be fixed in supporting bracket (4), the supporter (11) be fixedly connected with supporting bracket is provided with vertical fixing guide pillar (12), guide rod (14) is had in the middle of the slide block (13) be slidably matched with guide pillar (12), guide rod (14) protrudes from slide block (13), below and be fastenedly connected with slide block, guide rod (14) lower end is equiped with slide block back-moving spring (10), slide block left surface is provided with the plate (6) for driving the micro-disconnected shift fork (7) on miniature air circuit breaker (5) to turn off, vertically with supporter (11) to fix, the top of the limited screw (9) be connected with skid is provided with spacing head (8), rotating shaft (16) right-hand member spindle nose is provided with the shifting block (15) being fastenedly connected with rotating shaft and protruding from axle side, shifting block (15) presses with the guide rod (14) in the middle of slide block (13) when rotating with rotating shaft (16) and coordinates.

2. the electric controller of isolating switch according to claim 1, is characterized in that the plate (6) of slide block left surface is " U " font.

3. the electric controller of isolating switch according to claim 1, is characterized in that shifting block (15) is for " V " font.