Device for automatically testing service life of circuit breaker handcart of high-voltage switch cabinet

Abstract

The utility model discloses a high voltage switch cabinet breaker handcart service life automatic test device comprising a connector, a screw rod, a motor, a control module and a mounting rack, one end of the screw rod is connected with the driving end of the motor, and the screw rod is provided with a moving block in threaded connection; the connector is fixedly connected with the moving block and is connected with a circuit breaker handcart, and the control module is electrically connected with the motor and comprises a main control circuit, a forward rotation circuit, a reverse rotation circuit and a handcart state judgment circuit. The high-voltage switch cabinet circuit breaker handcart service life automatic testing device disclosed by the utility model replaces a traditional manual test, and improves the efficiency; according to the handcart electrical control principle, working, testing and middle position electrical control are set, and the service life of the circuit breaker handcart can be tested when the circuit breaker handcart is in three different initial states.

Description

TECHNICAL FIELD

[0001] The utility model belongs to circuit breaker handcart test technical field, specifically related to a kind of high voltage switchgear circuit breaker handcart life automatic testing device. BACKGROUND

[0002] KYN28A high voltage switchgear as one of the most representative products, its feature is the vacuum circuit breaker equipped for middle, i.e. circuit breaker is located in the middle part of the front cabinet of switchgear, lower part space-saving can be used for other scheme extension or as cable chamber. Circuit breaker is the core component of KYN28A high voltage switchgear. When short circuit or overload occurs in circuit, circuit breaker can quickly cut off fault current, prevent fault expansion, protect the entire power system, so its excellent performance is crucial.

[0003] Circuit breaker handcart is an important component of KYN28A switchgear, for carrying circuit breaker and realizing its moving in, moving out and positioning function. Mechanical life and reliability of handcart directly affect operating performance of circuit breaker and overall operation stability of switchgear. National standard GB / T 3906 "3.6kV~40.5kV AC metal-enclosed switchgear and controlgear" clause 6.104 removable parts and national standard GB 1985 "high voltage AC disconnector and earthing switch" clause 6.102.4 mechanical life test related provisions: removable parts are pulled out from working position to removed position and then pushed into working position from removed position, normal operating force is applied, and each 1000 times of pushing in and pulling out operation should be normal, and isolation plug plating should be good.

[0004] At present, traditional handcart life test method has certain limitation: (1) manual test inefficiency. Mainly rely on manual operation, test cycle is long, test frequency cannot be controlled, and it is easily affected by human factors. (2) test precision is insufficient. Manual test is difficult to accurately control test parameters (such as test count, operating force, stroke, speed, etc.), so that test result reliability is not high.

[0005] Therefore, for the above problems, further improvement is made. UTILITY MODEL CONTENT

[0006] The main purpose of the utility model is to provide a kind of high voltage switchgear circuit breaker handcart life automatic testing device, based on STM32 single-chip microcomputer control direct current motor operation, replace traditional manpower test, improve efficiency;According to handcart electrical control principle, set up work, test, intermediate position electrical control, can carry out life test when circuit breaker handcart is in three different initial states.

[0007] In order to achieve the above object, the utility model provides a high -voltage switchgear circuit breaker handcart life automatic testing device, including (hexagonal) connector, screw rod, motor, control module and mounting bracket, wherein:

[0008] One end of the screw rod is connected with the driving end of the motor, and a threaded moving block is arranged on the screw rod, the connector is fixedly connected with the moving block, and the connector is connected with the circuit breaker handcart (chassis car), the motor is installed on the mounting rack on one side of the high -voltage switchgear, the control module is electrically connected with the motor, and the control module comprises a main control circuit, a forward rotation circuit, a reverse rotation circuit and a handcart state judgment circuit, wherein:

[0009] The main control circuit comprises a main control U1, the forward rotation circuit comprises a photoelectric coupler U2 and a triode Q1, the cathode of the photoelectric coupler U2 is electrically connected with the 10 pin of the main control U1, one way of the collector of the photoelectric coupler U2 is electrically connected with the base of the triode Q1 through the resistance R3, and the other way is electrically connected with the relay K1 through the resistance R1, and the emitter of the triode Q1 is electrically connected with the relay K1 (the relay K1 is connected with the motor);

[0010] The reverse rotation circuit comprises a photoelectric coupler U3 and a triode Q2, the cathode of the photoelectric coupler U3 is electrically connected with the 11 pin of the main control U1, one way of the collector of the photoelectric coupler U3 is electrically connected with the base of the triode Q2 through the resistance R6, and the other way is electrically connected with the relay K2 through the resistance R4, and the emitter of the triode Q2 is electrically connected with the relay K2 (the relay K2 is connected with the motor);

[0011] The handcart state judgment circuit comprises a circuit breaker navigation plug J2 and a circuit breaker navigation plug J3, one end of the circuit breaker navigation plug J2 is electrically connected with the 42 pin of the main control U1 through the resistance R7, and one end of the circuit breaker navigation plug J3 is electrically connected with the 43 pin of the main control U1 through the resistance R9.

[0012] As a further preferred technical scheme of the above technical scheme, the circuit breaker navigation plug J2 and the circuit breaker navigation plug J3 are electrically connected with the auxiliary switch S8 and S9 of the circuit breaker handcart respectively.

[0013] As a further preferred technical scheme of the above technical scheme, the anode of the photoelectric coupler U2 is connected with the power supply end VCC through the resistance R2, and the anode of the photoelectric coupler U3 is connected with the power supply end VCC through the resistance R5.

[0014] As a further preferred technical scheme of the above technical scheme, one end of the circuit breaker jack J2 is connected to a power supply end VCC and the other end is connected to ground through a capacitor C1 and a resistor R8 in sequence, and one end of the circuit breaker jack J3 is connected to the power supply end VCC and the other end is connected to ground through a capacitor C2 and a resistor R10 in sequence.

[0015] As a further preferred technical scheme of the above technical scheme, the control module further comprises a display circuit electrically connected with the main control circuit.

[0016] The utility model has the advantages that:

[0017] 1. Based on STM32 single-chip microcomputer control DC motor operation, replace traditional manpower test, improve efficiency.

[0018] 2. According to the handcart electrical control principle, set up work, test, intermediate position electrical control, when the circuit breaker handcart is in three different initial states, can carry out life test. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structural schematic diagram of the utility model.

[0020] Figure 2 It is the main control circuit diagram of the utility model.

[0021] Figure 3 It is the forward rotation circuit diagram of the utility model.

[0022] Figure 4 It is the reverse rotation circuit diagram of the utility model.

[0023] Figure 5 It is the handcart state judgment circuit diagram of the utility model.

[0024] Figure 6 It is the display circuit diagram of the utility model.

[0025] Figure 7 It is the handcart electrical control principle diagram of the utility model.

[0026] The reference signs include: 1, high voltage switch cabinet;2, vacuum circuit breaker;3, circuit breaker handcart;4, connection;5, screw rod;6, motor;7, mounting frame. DETAILED DESCRIPTION

[0027] The following description is used to disclose the present application so that those skilled in the art can implement the present application. The preferred embodiments in the following description are only used as examples, and other obvious modifications can be thought by those skilled in the art. The basic principles defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0028] The utility model discloses a high voltage switchgear circuit breaker handcart life automatic testing arrangement, below combining preferred embodiments, the specific embodiment of the utility model is further described.

[0029] In the embodiments of the utility model, those skilled in the art pay attention, the high voltage switchgear, circuit breaker handcart etc. Involved in the utility model can be regarded as prior art.

[0030] Preferred embodiments.

[0031] As Figures 1-7 The utility model discloses a high voltage switchgear circuit breaker handcart life automatic testing arrangement, including (hexagonal) connector 4, screw rod 5, motor 6, control module and mounting bracket 7, wherein:

[0032] One end of the screw rod 5 is connected with the driving end of the motor 6, and a threaded moving block is arranged on the screw rod 5, the connector 4 is fixedly connected with the moving block, and the connector 4 is connected with the circuit breaker handcart 3 (of the chassis car), the motor 6 is installed on the mounting bracket 7 located on one side of the high voltage switchgear 1, the control module is electrically connected with the motor 6, and the control module comprises a main control circuit, a forward rotation circuit, a reverse rotation circuit and a handcart state judgment circuit, wherein:

[0033] The main control circuit comprises a main controller U1, the forward rotation circuit comprises a photoelectric coupler U2 and a triode Q1, the cathode of the photoelectric coupler U2 is electrically connected with the 10 pin of the main controller U1, one way of the collector of the photoelectric coupler U2 is electrically connected with the base of the triode Q1 through a resistance R3, and the other way is electrically connected with a relay K1 through a resistance R1, and the emitter of the triode Q1 is electrically connected with the relay K1 (the relay K1 is connected with the motor);

[0034] The reverse rotation circuit comprises a photoelectric coupler U3 and a triode Q2, the cathode of the photoelectric coupler U3 is electrically connected with the 11 pin of the main controller U1, one way of the collector of the photoelectric coupler U3 is electrically connected with the base of the triode Q2 through a resistance R6, and the other way is electrically connected with a relay K2 through a resistance R4, and the emitter of the triode Q2 is electrically connected with the relay K2 (the relay K2 is connected with the motor);

[0035] The handcart state judging circuit comprises a circuit breaker jack J2 and a circuit breaker jack J3, one end of the circuit breaker jack J2 is electrically connected with the 42 pin of the main controller U1 through a resistor R7, and one end of the circuit breaker jack J3 is electrically connected with the 43 pin of the main controller U1 through a resistor R9.

[0036] Specifically, the circuit breaker jack J2 and the circuit breaker jack J3 are electrically connected with auxiliary switches S8 and S9 of the circuit breaker handcart respectively.

[0037] More specifically, the anode of the photoelectric coupler U2 is connected with a power supply end VCC through a resistor R2, and the anode of the photoelectric coupler U3 is connected with the power supply end VCC through a resistor R5.

[0038] Further, the other end of the circuit breaker jack J2 is connected with the power supply end VCC in one way and connected with the ground in another way through a capacitor C1 and a resistor R8 in sequence, and the other end of the circuit breaker jack J3 is connected with the power supply end VCC in one way and connected with the ground in another way through a capacitor C2 and a resistor R10 in sequence.

[0039] Still further, the control module further comprises a display circuit which is electrically connected with the main control circuit.

[0040] Preferably, the circuit breaker handcart 3 is used for carrying the vacuum circuit breaker 2 and realizing the functions of moving in, moving out and positioning.

[0041] The circuit breaker handcart 3 is carried by a chassis cart and is reliably mechanically connected with a lead screw 5 through a connector 4;

[0042] The connector 4 is used for transmitting the driving force of the testing device, adjusting the position of the handcart, and realizing the electrical connection between the circuit breaker handcart and the primary and secondary circuits of the switch cabinet.

[0043] The lead screw 5 converts the rotary motion of the testing device into linear motion and drives the operation of the circuit breaker chassis cart.

[0044] The motor drives the rotation of the lead screw 5, the connector 4 is fixed with a moving block on the lead screw 5, and the connector 4 will move linearly along the axis direction of the lead screw, thereby driving the circuit breaker chassis cart connected therewith to realize accurate linear displacement.

[0045] The mounting frame 7 is an aluminum profile frame structure and can realize height adjustment, and a bottom thereof is additionally provided with a fixed universal wheel which can flexibly adjust the horizontal position of the testing device.

[0046] The handcart electrical control principle diagram is as follows Figure 7As shown, for the test experiment of the circuit breaker handcart in different states, the circuit breaker QF is in the test position and the off state. The auxiliary switch S8 is used for switching the motor direction when the handcart is in the test position, and the auxiliary switch S9 is used for switching the motor direction when the handcart is in the working position.

[0047] The circuit breaker handcart life test device provided by the utility model can directly complete the life test of the handcart from the working position to the removed position and then from the removed position to the working position by using the DC motor and the control module, and counting and protection are carried out, and the working efficiency is improved. The DC motor 6 is fixed on the fixing support 7, and connection is realized through cooperation of the above-mentioned components. The control module controls the motor forward and reverse rotation at a certain rate according to the current state of the handcart, so as to realize the handcart life test, and counting and protection are carried out.

[0048] The working position is that the handcart is completely inserted into the switch cabinet, the main circuit (primary circuit) is reliably connected with the cabinet body, and is in the normal working state. At this time, the handcart electrical control is that S8 is disconnected and S9 is connected.

[0049] The test position is that the handcart is partially pulled out, the main circuit is disconnected, but the secondary circuit is still connected, and the function test is facilitated. At this time, the handcart electrical control is that S8 is connected and S9 is disconnected.

[0050] The intermediate position is that the handcart is completely separated from the cabinet body, and is disconnected with the main circuit and the secondary circuit, and is in the power-off isolation state. At this time, the handcart electrical control is that S8 and S9 are both disconnected.

[0051] In the circuit breaker handcart electrical control diagram, the auxiliary switches S8 and S9 are connected with the circuit breaker insertion J2 and J3 respectively, and are used for handcart state judgment.

[0052] According to the distance required for the test device to travel in three states of the circuit breaker handcart, the test control flow is as follows:

[0053] (1) The starting state is the working position, that is, S8 is disconnected and S9 is connected (J2 is disconnected and J3 is connected), the handcart state judgment circuit inputs a high level to the PB7 end of the main control chip, and simultaneously outputs a high level to the PA1 end, controls the motor to reverse, and until it is detected that the test position is entered, that is, S8 is connected and S9 is disconnected (J2 is disconnected and J3 is connected), the handcart state judgment circuit inputs a high level to the PB6 end of the main control chip, and simultaneously outputs a high level to the PA0 end, controls the motor to rotate forward, and when the working position is entered again, the main control chip timer counts, and the test number is increased by 1.

[0054] (2) The initial state is the test position, i.e. S8 on S9 off (J2 on J3 off), the handcart state judgment circuit inputs high level to the PB6 end of the main control chip, and at the same time, the PA0 end outputs high level, the motor is controlled to rotate forward, until the working position is detected, i.e. S8 off S9 on (J2 off J3 on), the handcart state judgment circuit inputs high level to the PB7 end of the main control chip, and at the same time, the PA1 end outputs high level, the motor is controlled to rotate reversely, and when the test position is entered again, the main control chip timer counts, and the test number is increased by 1.

[0055] (3) The initial state is the intermediate position, i.e. S8 off S9 off (J2 off J3 off), the handcart state judgment circuit inputs low level to the PB6 and PB7 ends of the main control chip, and at the same time, the PA0 end outputs high level, the motor is controlled to rotate forward, until the test position is detected, the process of (2) is executed.

[0056] The direct current motor forward and reverse control circuit mainly comprises an optoisolator, a PNP and two double-pole single-throw relays (Relay-DPST). The energization circuit of the double-pole single-throw relay K1 is that the A end of the direct current motor is connected to the positive pole of the power supply through the switch of K1, the B end is grounded through the other switch of K1, the relay coil is energized, the double-pole of K1 is closed at the same time, the current flows from the A end to the B end, and the motor rotates forward; similarly, the energization circuit of the double-pole single-throw relay K2 is that the A end of the direct current motor is connected to the ground through the switch of K2, the B end is connected to the positive pole of the power supply through the other switch of K2, the relay coil is energized, the double-pole of K2 is closed at the same time, the current flows from the B end to the A end, and the motor rotates reversely. The specific implementation process is as follows:

[0057] (a) Forward rotation circuit. When the main control chip (i.e. the main controller U1) inputs high level to the output end (PA0), the current flows into the light-emitting diode of the optoisolator through the current-limiting resistor (R2), so that the light-emitting diode emits light, thereby making the photosensitive element inside the optoisolator conduct, transmitting the left electrical signal to the right circuit, realizing electrical isolation, and avoiding the left circuit from being disturbed by the large current circuit on the right. After the optoisolator is turned on, a low-level signal lower than the emitter of the PNP transistor (Q1) is provided to the base of the PNP transistor, so that the transistor is turned on, the coil of the double-pole single-throw relay K1 is energized, the double-pole single-throw relay K1 is attracted, and the motor rotates forward.

[0058] (b) reverse circuit, same reason. When the master chip input output end (PA1) output high level, current flows through the current limiting resistor (R5) into the light emitting diode of optocoupler, make it emit light, so that the photosensitive element inside the optocoupler is turned on, the left side of the electrical signal isolation transmission to the right side circuit, realize electrical isolation, avoid the left side circuit is interfered by the right side of the large current circuit. After the optocoupler is turned on, a potential lower than the emitter of the PNP transistor (Q2) is provided, so that the transistor is turned on, and the coil of the double pole single throw relay K2 is energized. The double pole single throw relay K2 is attracted, and the motor is reversed.

[0059] Further, two simple relays K3 and K4 can be used to replace. The A end and B end of the DC motor are connected to the common contact of K3 and K4 respectively, and the normally closed contact of both is grounded, and the normally open contact is connected to the positive electrode of the power supply. The K3 relay coil is controlled by the forward rotation circuit, the master chip PA0 outputs high level, the coil is energized, the K3 relay is attracted, the common contact is connected with the K3 normally open contact, the current flows from the A end to the B end, and the motor rotates forward. If the master chip PA0 outputs low level, the coil is de-energized, the K3 relay is disconnected, the common contact is disconnected with the K3 normally open contact, and the motor stops working. The K4 relay coil is controlled by the reverse circuit, and the above is the same.

[0060] The display of the master chip timer count is realized by the OLED display circuit. VVC and GND form a power supply circuit of the display screen 3.3V, the input and output ends PB6 and PB7 of the master chip are connected with the serial clock line SCL and the serial data line SDA of the OLED display circuit respectively, and I2C communication is carried out. SCL is used for transmitting clock signal, and provides synchronous timing for data transmission. SDA is used for transmitting actual data, and displays the master chip timer count value as the test times.

[0061] It is worth mentioning that the high-voltage switch cabinet, circuit breaker handcart and other technical features involved in the utility model patent application should be regarded as prior art. The specific structure, working principle and possible control mode and spatial arrangement mode of these technical features can be selected conventionally in the art, and should not be regarded as the invention point of the utility model patent. The utility model patent will not be further expanded and described in detail.

[0062] For those skilled in the art, the technical solutions described in the foregoing embodiments can be modified or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An automatic testing device for the life of a high-voltage switchgear circuit breaker trolley, characterized in that, Includes connectors, lead screws, motors, control modules, and mounting brackets, among which: One end of the lead screw is connected to the drive end of the motor, and the lead screw is provided with a threaded movable block. The connector is fixedly connected to the movable block and is also connected to the circuit breaker trolley. The motor is mounted on the mounting bracket located on one side of the high-voltage switchgear. The control module is electrically connected to the motor and includes a main control circuit, a forward rotation circuit, a reverse rotation circuit, and a trolley status judgment circuit, wherein: The main control circuit includes a main controller U1, and the forward rotation circuit includes an optocoupler U2 and a transistor Q1. The cathode of the optocoupler U2 is electrically connected to pin 10 of the main controller U1. One of the collectors of the optocoupler U2 is electrically connected to the base of the transistor Q1 through a resistor R3, and the other is electrically connected to a relay K1 through a resistor R1. The emitter of the transistor Q1 is electrically connected to the relay K1. The inverting circuit includes an optocoupler U3 and a transistor Q2. The cathode of the optocoupler U3 is electrically connected to pin 11 of the main controller U1. One of the collectors of the optocoupler U3 is electrically connected to the base of the transistor Q2 through a resistor R6, and the other is electrically connected to a relay K2 through a resistor R4. The emitter of the transistor Q2 is electrically connected to the relay K2. The handcart status judgment circuit includes a circuit breaker connector J2 and a circuit breaker connector J3. One end of the circuit breaker connector J2 is electrically connected to pin 42 of the main controller U1 through a resistor R7, and one end of the circuit breaker connector J3 is electrically connected to pin 43 of the main controller U1 through a resistor R9.

2. The automatic testing device for the life of a high-voltage switchgear circuit breaker trolley according to claim 1, characterized in that, Circuit breaker connector J2 and circuit breaker connector J3 are electrically connected to the auxiliary switches S8 and S9 of the circuit breaker trolley, respectively.

3. The automatic testing device for the life of a high-voltage switchgear circuit breaker trolley according to claim 2, characterized in that, The anode of the optocoupler U2 is connected to the power supply terminal VCC through resistor R2, and the anode of the optocoupler U3 is connected to the power supply terminal VCC through resistor R5.

4. The automatic testing device for the life of a high-voltage switchgear circuit breaker trolley according to claim 3, characterized in that, One end of the circuit breaker connector J2 is connected to the power supply terminal VCC, and the other end is grounded through capacitor C1 and resistor R8 in sequence. The other end of the circuit breaker connector J3 is connected to the power supply terminal VCC, and the other end is grounded through capacitor C2 and resistor R10 in sequence.

5. The automatic testing device for the life of a high-voltage switchgear circuit breaker trolley according to claim 4, characterized in that, The control module also includes a display circuit, which is electrically connected to the main control circuit.

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