A turnout protector detection device

Abstract

The present invention discloses a turnout protector detection device, which includes a main circuit and a control circuit; the three-phase AC power supply of the main circuit is sequentially connected to a main switch and the normally open contacts of a first control relay, the lower terminals of the normally open contacts of the first control relay are respectively connected to the primary coil of the turnout protector, the lower terminal of the primary coil is connected to a first load; a second load is connected in parallel with the first load, and the second load is connected to a second control relay; the open-phase switch is disconnected, and the open-phase current is measured through the ammeter; the main path of the control circuit is provided with a main path switch, and the first parallel branch is provided with a main circuit stop button, a time relay and a main circuit closing button connected in sequence, and the first control relay is connected in parallel at both ends of the main circuit closing button. The present invention makes up for the technical blank of turnout protector testing, can test the turnout protector and record data, thereby improving the detection efficiency and improving the test conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of test devices, and particularly to a turnout protector detection device. Background Art

[0002] As a product specifically designed and developed for the control circuit of three-phase AC switch machines, a turnout protector is equipped with a turnout phase failure protector in the control circuit to prevent the three-phase AC power supply from being interrupted and burning out the motor. The turnout protector has been playing an increasingly important role in urban rail transit. The protector uses the principle of electromagnetic induction to generate a DC 24V voltage for use in conjunction with the protection relay BHJ (JWXC-1700) in the three-phase motor protection circuit. When the three-phase motor is out of phase, the protection relay BHJ loses its magnetism and drops, and its contacts are used to cut off the power supply to form an alarm condition, preventing the motor from running with a phase missing and being damaged, thus playing a role in phase failure protection. Currently, there is no device that can test the turnout protector. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem of the lack of reliable testing means for the turnout protector at present, and to provide a turnout protector detection device.

[0004] To achieve the above purpose, the present invention provides a turnout protector detection device. The turnout protector includes an instrument transformer, and the instrument transformer includes three primary coils and a secondary coil. The secondary coil is connected end to end and then connected to a rectifier bridge. The turnout protector detection device includes a main circuit and a control circuit;

[0005] The three-phase AC power supply of the main circuit is sequentially connected to the normally open contacts of the main switch and the first control relay. The lower terminals of the normally open contacts of the first control relay are respectively connected to the primary coils of the turnout protector. The lower terminals of the primary coils are respectively sequentially connected to a phase failure switch, an ammeter, and a first load. A second load is connected in parallel with the first load, and the second load is connected to a second control relay. The phase failure switch is disconnected, and the phase failure current is measured through the ammeter;

[0006] The main circuit of the control circuit is provided with a main circuit switch. The first parallel branch of the control circuit is provided with a main circuit stop button, a time relay, and a main circuit close button connected in sequence. The first control relay is connected in parallel across the two ends of the main circuit close button. The second parallel branch of the control circuit is provided with a load stop button and a load start button connected in sequence. The second control relay is connected in parallel across the two ends of the load start button;

[0007] The rectifier bridge is connected to the protection relay.

[0008] Preferably, a fan switch, a first control relay, and a fan are sequentially connected to the third parallel branch of the control circuit; when the fan switch is pressed, the first control relay is attracted, causing the fan to rotate.

[0009] Preferably, a power switch and a socket are sequentially connected to the fourth parallel branch of the control circuit; when the power switch is pressed, the socket is powered on.

[0010] Preferably, a protection relay and a time relay are sequentially connected to the fifth parallel branch of the control circuit; after the protection relay is powered on, the time relay is powered on, and the normally closed contact of the time relay is disconnected with a time delay.

[0011] Preferably, a timing meter is provided on the fifth parallel branch of the control circuit. Between the first end and the second end of the timing meter, there are a first branch of the timing meter and a second branch of the timing meter controlled by a time switch; the time switch is a single-pole double-throw switch;

[0012] The first branch of the timing meter is sequentially connected from the first end of the timing meter to the normally closed contact of the first control relay and the protection relay. The other end of the normally closed contact of the protection relay is connected to the time switch, and the time switch is connected to the second end of the timing meter; when the time switch connects the first branch of the timing meter, the protection relay is powered on, the first branch of the timing meter loses power, and the timing stops to obtain the start time;

[0013] The second branch of the timing meter is sequentially connected from the first end of the timing meter to the normally open contact of the first control relay and the protection relay. The other end of the normally open contact of the protection relay is connected to the time switch, and the time switch is connected to the second end of the timing meter; when the time switch connects the second branch of the timing meter, the protection relay is powered on, the second branch of the timing meter is powered on, and the timing starts.

[0014] Preferably, a reset button is provided on the timing meter.

[0015] Technical effects of the present invention:

[0016] The present invention makes up for the technical blank in the test of the switch protector, can test the switch protector and record data, thereby improving the detection efficiency and improving the test conditions, greatly shortening the detection time of the switch protector, increasing the accuracy of detecting the faulty switch protector, saving the maintenance cost, and having good social and economic benefits. Description of the Drawings

[0017] Figure 1 It is the main circuit diagram of the switch protector detection device provided by the present invention.

[0018] Figure 2Circuit diagram of the control loop of the switch protector detection device provided by the present invention.

[0019] Figure 3 Block diagram of the modules of the switch protector detection device provided by the present invention.

[0020] Figure 4 Schematic diagram of the test process of the switch protector detection device provided by the present invention. Detailed implementation manners

[0021] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] As Figure 1 and Figure 2 shown, the switch protector detection device provided by the present invention includes a main circuit and a control circuit. As Figure 1 shown, the main function of the main circuit is to connect and disconnect the three-phase load circuit. As Figure 2 shown, the main function of the control circuit is to realize functions such as controlling the on / off, detection, and display of the main circuit through various components.

[0023] As Figure 1 shown, the circuit composition of the main circuit is as follows: The three-phase AC 380V input voltage is connected to the main power supply ZK, and the output end of the main power supply ZK is connected to the three-phase full-automatic AC voltage regulator WY. The output ends of the voltage regulator WY are respectively connected to the air switches QA, QB, and QC, and the output ends of the air switches QA, QB, and QC are respectively connected to the 3 normally open contacts A1, B1, and C1 of the J1 control relay. The lower terminals of each normally open contact of the J1 control relay are respectively connected to the primary coils of the three current transformers L1, L2, and L3. The secondary coils of the three current transformers L1, L2, and L3 are connected end to end in sequence to form a secondary coil unit, and the head and tail of this secondary coil unit are connected to the rectifier bridge ZL. Further, the rectifier bridge ZL is also connected to the coil of the BHJ protection relay. Among them, the three current transformers and the rectifier bridge ZL form a switch protector.

[0024] The lower terminals of the primary coils of the three current transformers L1, L2, and L3 are respectively connected to the open-phase switches K1, K2, and K3. The output terminals of the open-phase switches K1, K2, and K3 are respectively connected in series with ammeters IA, IB, and IC. The output terminals of the ammeters IA, IB, and IC are respectively connected to loads R1, R3, and R5 (the ammeters IA, IB, and IC can detect the load alternating current of the switch protector). After the output terminals of the loads R1, R3, and R5 are connected, they are respectively connected to three normally open contacts A7, B7, and C7 of the J2 control relay. The three normally open contacts of the J2 control relay are respectively connected to loads R2, R4, and R6. The output terminals of the loads R2, R4, and R6 are respectively connected to another three normally open contacts A6, B6, and C6 of the J2 control relay, and finally connected back to the output terminals of the ammeters IA, IB, and IC, forming a three-phase load circuit.

[0025] When the J1 control relay in the main circuit is closed, when the open-phase switches K1, K2, and K3 in the main circuit are sequentially turned on, the three-phase AC 380V input voltage is input into the main circuit, the three-phase load circuit is turned on, the current transformers work in the magnetic saturation state, and the three-phase alternating current is rectified by the bridge rectifier ZL of the bridge rectifier to output a direct current, so that the BHJ protection relay is energized and attracted. At this time, the DC voltmeter V4 connected in parallel with the BHJ protection relay can detect the coil voltage of the BHJ protection relay, that is, the output voltage of the switch protector is detected. Conversely, when the open-phase switches K1, K2, and K3 are sequentially turned off, the three-phase AC 380V input power supply is correspondingly disconnected. At this time, the three-phase load circuit is disconnected, the output voltage of the current transformer is zero, the output voltage of the bridge rectifier ZL is zero, the BHJ protection relay is not energized, so it is not attracted, and the DC voltmeter V4 detects that the coil voltage of the BHJ protection relay is zero, that is, the output voltage of the switch protector is zero.

[0026] Such as Figure 2As shown in the figure, the circuit structure of the control loop is as follows: When the switch (A - N1) is closed to obtain an AC 220V control power supply, and then the QD switch in the control loop is closed, the switch (A - N1) is connected to the QD switch. Therefore, both ends of (1 - N) are powered on. Terminal 1 is connected to the main circuit stop button. The output terminal of the main circuit stop button is connected to the normally closed contact of the SJ time relay. The output terminal of the SJ time relay is connected to the main circuit start button. Both ends of the main circuit start button are respectively connected to the self - holding contacts 3 and 5 of the J1 control relay in the main circuit. And the output terminal of the main circuit start button is connected to the coil of the J1 control relay. The lower terminal of the J1 control relay coil is connected to the N terminal. When the main circuit start button is pressed, the self - holding contacts 3 and 5 of the J1 control relay are closed, and the J1 control relay coil is energized and attracted. The control power supply passes through the main circuit stop button → the normally closed contact of the SJ time relay → the main circuit start button → the J1 control relay coil to be energized and pulled up, making the main circuit connected and start to work (and at this time, the phase - failure switches K1, K2, and K3 are in the on state). The three - phase loads R1, R3, and R5 are connected (because the J1 control relay makes its coil energized and attracted through the control loop at this time. At this time, the three normally open contacts of the J1 control relay are closed, and the lower terminal is powered on, making R1, R3, and R5 in the three - phase load circuit connected). In addition, the secondary coils of the mutual inductors L1 - L3 in the main circuit generate induced voltages, which make the BHJ protection relay energized and attracted after being rectified by the rectifier bridge).

[0027] Terminal 1 in the control loop is connected to the load stop button. The output terminal of the load stop button is connected to the load start button. Both ends of the load start button are respectively connected to the self - holding contacts 7 and 9 of the J2 control relay in the main circuit. And the output terminal of the load start button is connected to the coil of the J2 control relay. The lower terminal of the J2 control relay coil is connected to the N terminal. At this time, when the load start button is further pressed, the self - holding contacts 7 and 9 of the J2 control relay are closed, and the J2 control relay coil is energized and attracted. The control power supply passes through the load stop button → the load start button → the J2 control relay coil to be energized and pulled up. When the J2 control relay is pulled up, all the normally open contacts of the J2 control relay in the main circuit are closed, and R1 is in parallel with R2, R3 is in parallel with R4, and R5 is in parallel with R6, thereby increasing the load current.

[0028] Terminal 1 in the control loop is connected to the QE switch. The QE switch is connected to the J1 control relay. The J1 control relay is connected to the fan. Similarly, when the QE switch is further pressed at this time, since the relay is energized and attracted, the control power supply passes through the QE switch → the J1 control relay → the fan, making the fan energized and rotate.

[0029] Terminal 1 in the control loop is connected to the QF switch, and the QF switch is connected to the socket CZ. Similarly, when the QF switch is pressed at this time, the control power supply passes through the QF switch → socket CZ, causing the socket CZ to be powered on and supply power to the industrial computer, monitor, etc.

[0030] Terminal 1 in the control loop is connected to the normally open contact of the BHJ protection relay, and the normally open contact of the BHJ protection relay is connected to the coil of the SJ time relay. Similarly, when the coil of the BHJ protection relay is powered on, the normally open contact of the BHJ closes and connects, so the coil of the SJ time relay is powered on, and the normally closed contact of the SJ time relay delays to open. During the period when the SJ time relay delays to open, the phase-breaking switches K1-K3 in the main circuit are respectively disconnected, and the phase-breaking current is detected. When the SJ time relay is officially disconnected after the delay, the coil of the J1 control relay loses power, and the time period detection is performed. When the main circuit stop button is pressed, the main circuit stop button disconnects, the coil of the J1 control relay loses power and drops, and the self-holding contacts 3 and 5 of the J1 control relay lose power and disconnect, preparing for the second round of testing.

[0031] Among them, when detecting the phase-breaking current, the phase-breaking switches K1, K2, and K3 can be respectively disconnected to disconnect the A-phase or B-phase or C-phase circuit in the three-phase circuit; specifically:

[0032] When the phase-breaking switch K1 is turned to the A-phase connection, the power supply is connected through the K1 switch (61-A3). When the phase-breaking switch K1 is turned to the A-phase break, the K1 switch (61-A2) is connected.

[0033] When the phase-breaking switch K2 is turned to the B-phase connection, the power supply is connected through the K2 switch (41-B3). When the phase-breaking switch K2 is turned to the B-phase break, the K1 switch (41-B2) is connected.

[0034] When the phase-breaking switch K3 is turned to the C-phase connection, the power supply is connected through the K3 switch (21-C3). When the phase-breaking switch K3 is turned to the C-phase break, the K1 switch (21-C2) is connected.

[0035] The turnout protector test device provided by the present invention can also test the start-up time and limited time of the turnout protector. Such as Figure 2As shown in the figure, the time setting switch K4 is set to the start time position. When the main circuit is closed by pressing the start button, the coil of the J1 control relay is energized (described in the previous text). Terminal 3 of the timer set inside the switch protector is connected to the J1 control relay contact. Contacts 25 and 27 of J1 are closed and connected, and are also connected to the normally closed contact of BHJ. The other terminal of the normally closed contact of BHJ is connected to terminal 4 of the timer. Therefore, (F - 27) is connected between terminal 3 and terminal 4 of the timer, and the timer starts timing. Similarly, when the BHJ coil is energized, the normally closed contact of BHJ opens, and (F - 27) loses power between terminal 3 and terminal 4 of the timer, and the timing automatically stops. At this time, the obtained timing is the start time. After the test is completed, the record is saved. Press the reset button, (F0 - F) on the timer is connected, and the timer is reset to zero, ready for the next test.

[0036] For the 13 - second delay type switch protector that is currently used more frequently, such as Figure 2 As shown in the figure, the time setting switch K4 is switched to the limited time position. When the main circuit is closed by pressing the start button, the coil of the J1 control relay is energized (described in the previous text). The J1 control relay contact is connected to terminal 3 of the timer set inside the switch protector. Contacts 27 and 33 of J1 are closed and connected, and are also connected to the BHJ contact. When the BHJ coil is energized, contacts 29 and 33 of BHJ are connected. The other end of the BHJ contact is connected to terminal 4 of the timer. Therefore, (F - 27) is connected between terminal 3 and terminal 4 of the timer, and the measured 13 - second delay type switch protector starts timing. When it reaches 13 seconds, the DJ coil inside the switch protector is energized, the normally closed contact of DJ opens, and the BHJ coil loses power. Since the BHJ coil in the main circuit loses power, the BHJ contact (29 - 33) in the control circuit opens. At this time, (F - 27) of the timer loses power, and the timer automatically stops timing, completing the 13 - second limited timing. After the test is completed, press the reset button, (F0 - F) on the timer is connected and reset to zero, ready for the next test.

[0037] Such as Figure 3 and Figure 4 As shown in the figure, the usage method of the switch protector detection device provided by the present invention is as follows:

[0038] First, observe whether the test device is in the shutdown state. In the shutdown state, insert the switch protector to be tested onto the test seat of the test bench.

[0039] Turn the "main power" switch knob to the on state. At this time, the test device starts, and the "power control" red light is on; confirm that the phase - break switches K1, K2, and K3 are all in the on state.

[0040] Three-phase input voltage test: Press the "Main circuit on" button and record the values of AC voltmeters (V1), (V2), and (V3). The AC voltmeter V1 is connected between the A-phase output and B-phase output of the three-phase full-automatic AC voltage regulator WY; the AC voltmeter V2 is connected between the B-phase output and C-phase output of the three-phase full-automatic AC voltage regulator WY; the AC voltmeter V3 is connected between the A-phase output and C-phase output of the three-phase full-automatic AC voltage regulator WY.

[0041] Three-phase input current test: Press the "Main circuit on" button and record the values of AC ammeters (IA), (IB), and (IC).

[0042] Output voltage test: Press the "Main circuit on" button and record the value of the DC voltmeter (V4).

[0043] Startup time test: Turn the "Time setting" knob to the "Startup time" position and record the value of the stopwatch (S) at this time, which is the startup time.

[0044] Limited time test: Turn the "Time setting" knob to the "Limited time" position and record the value of the stopwatch (S) at this time, which is the limited time.

[0045] Test of B-phase and C-phase input currents and output voltage when A-phase is interrupted: Turn the phase-breaking switch K1 knob to the "Break" position and turn the phase-breaking switches K2 and K3 knobs to the "On" position. At this time, record the values of AC ammeters (IB), (IC), and DC voltmeter (V4).

[0046] Test of A-phase and C-phase input currents and output voltage when B-phase is interrupted: Turn the phase-breaking switch K2 knob to the "Break" position and turn the phase-breaking switches K1 and K3 knobs to the "On" position. At this time, record the values of AC ammeters (IA), (IC), and DC voltmeter (V4).

[0047] Test of A-phase and B-phase input currents and output voltage when C-phase is interrupted: Turn the phase-breaking switch K3 knob to the "Break" position and turn the phase-breaking switches K1 and K2 knobs to the "On" position. At this time, record the values of AC ammeters (IA), (IB), and DC output voltmeter (V4).

[0048] When a load test is required, press the "Load start" button, repeat the above test steps, and record the values of each item. When the test is completed, turn off the "Load start" button.

[0049] The "Reset button" can clear the data of the stopwatch (S), which is convenient for re-timing during the next test.

[0050] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be construed as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and alternatives to the present invention will be obvious. Therefore, the protection scope of the present invention shall be defined by the appended claims.

Claims

1. A turnout protector detection device, the turnout protector includes a mutual inductor, the mutual inductor includes three primary coils and a secondary coil, and the secondary coil is connected to a rectifier bridge after being connected end to end; characterized in that, The turnout protector detection device includes a main circuit and a control circuit; The three-phase AC power supply of the main circuit is sequentially connected to the main switch and the normally open contact of the first control relay. The lower terminals of the normally open contact of the first control relay are respectively connected to the primary coil of the turnout protector. The lower terminals of the primary coil are sequentially connected to the phase failure switch, the ammeter, and the first load. A second load is connected in parallel with the first load, and the second load is connected to the second control relay. The phase failure switch is disconnected, and the phase failure current is measured through the ammeter; The main path of the control circuit is provided with a main path switch. The first parallel branch of the control circuit is provided with a main circuit stop button, a time relay, and a main circuit close button connected in sequence. The first control relay is connected in parallel across the two ends of the main circuit close button. The second parallel branch of the control circuit is provided with a load stop button and a load start button connected in sequence. The second control relay is connected in parallel across the two ends of the load start button. The fifth parallel branch of the control circuit is sequentially connected with a protection relay and a time relay. After the protection relay is powered on, the time relay is powered on, and the normally closed contact of the time relay is delayed to open; The rectifier bridge is connected to the protection relay.

2. The switch protector detection device according to claim 1, characterized in that, The third parallel branch of the control circuit is sequentially connected with a fan switch, the first control relay, and the fan. When the fan switch is pressed, the first control relay pulls in, causing the fan to rotate.

3. The turnout protector detection device according to claim 1, wherein, The fourth parallel branch of the control circuit is sequentially connected with a power switch and a socket. When the power switch is pressed, the socket is powered on.

4. The switch protector detection device according to claim 1, wherein, A timing meter is provided on the fifth parallel branch of the control circuit. Between the first end and the second end of the timing meter, there are a first branch of the timing meter and a second branch of the timing meter controlled by a time switch. The time switch is a single-pole double-throw switch; The first branch of the timing meter is sequentially connected from the first end of the timing meter to the normally closed contact of the first control relay and the protection relay. The other end of the normally closed contact of the protection relay is connected to the time switch, and the time switch is connected to the second end of the timing meter. When the time switch connects the first branch of the timing meter, the protection relay is powered on, the first branch of the timing meter loses power, and the timing stops to obtain the start time; The second branch of the timing meter is sequentially connected from the first end of the timing meter to the normally open contact of the first control relay and the protection relay. The other end of the normally open contact of the protection relay is connected to the time switch, and the time switch is connected to the second end of the timing meter. When the time switch connects the second branch of the timing meter, the protection relay is powered on, the second branch of the timing meter is powered on, and the timing starts.

5. The turnout protector detection device according to claim 4, characterized in that A reset button is provided on the timing meter.

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