A control relay testing device

Abstract

This utility model relates to the field of control relay testing technology, and discloses a control relay testing device, including a power supply unit, a control unit, a first communication unit, a second communication unit, and a programmable adjustable three-phase power supply. The power supply unit provides the operating voltage. The control unit is electrically connected to the programmable adjustable three-phase power supply through the first communication unit, and controls the test voltage and test current output by the programmable adjustable three-phase power supply. The control unit acquires the test data of the control relay under test through the second communication unit. In actual use, the control unit of this utility model adjusts the voltage and current output by the programmable adjustable three-phase power supply through the first communication unit, thereby providing a corresponding test environment according to the actual application scenario of the control relay, ensuring the authenticity and reliability of the test results. In addition, during actual testing, the operator only needs to connect the control relay to the programmable adjustable three-phase power supply, which simplifies the test and reduces the workload.

Description

Technical Field

[0001] This utility model relates to the field of control relay testing technology, and specifically to a control relay testing device. Background Technology

[0002] Currently, in power systems, control relays are often used for relay protection and integrated protection. Existing control relays often require a lot of manual equipment calibration and protection function testing during the production process. This not only requires a large number of personnel but also incurs significant professional training costs to train professional testing personnel.

[0003] In addition, existing control relays cannot simulate actual application environments during testing, cannot simulate the working state of protection functions under edge triggering and interference, and cannot comprehensively test the stability of the equipment's protection functions and the equipment's timeliness. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present invention provides a control relay testing device. The technical problem to be solved is that existing control relays require a lot of manual testing and cannot simulate the actual application environment for testing.

[0005] To solve the above technical problems, this utility model provides the following technical solution: a control relay testing device, including a power supply unit, a control unit, a first communication unit, a second communication unit, and a programmable adjustable three-phase power supply;

[0006] The power supply unit is used to provide operating voltage for the control unit, the first communication unit and the second communication unit; the control unit is electrically connected to the programmable three-phase power supply through the first communication unit, and controls the magnitude of the test voltage and the magnitude of the test current output by the programmable three-phase power supply.

[0007] The control unit is electrically connected to the second communication unit, and obtains the test data of the controlled relay under test through the second communication unit.

[0008] In one embodiment, the first communication unit includes a 232 communication unit and a network port communication unit, and the control unit is electrically connected to the programmable adjustable three-phase power supply through the 232 communication unit and the network port communication unit respectively.

[0009] In one embodiment, the second communication unit is a 485 communication unit.

[0010] In one embodiment, the 485 communication unit includes an optocoupler chip U5, an optocoupler chip U6, an optocoupler chip U8, and a 485 communication chip U7;

[0011] Pin 8 of the optocoupler chip U5 is used to connect to the working power supply and is electrically connected to one end of resistor R9, one end of capacitor C1, and one end of resistor R10. The other end of resistor R9 and the other end of capacitor C1 are electrically connected to pin 7 of optocoupler chip U5. The other end of resistor R10 is electrically connected to pin 6 of optocoupler chip U5 and pin 4 of 485 communication chip U7. Pin 5 of optocoupler chip U5 is grounded. Pin 2 of optocoupler chip U5 is connected to 3.3V voltage through resistor R13. Pin 3 of optocoupler chip U5 is electrically connected to the control unit.

[0012] Pin 8 of the optocoupler chip U6 is used to connect to the working power supply and is electrically connected to one end of resistor R11, one end of capacitor C2, and one end of resistor R12. The other end of resistor R11 and the other end of capacitor C2 are electrically connected to pin 7 of optocoupler chip U6. The other end of resistor R12 is electrically connected to pin 6 of optocoupler chip U6 and pins 2 and 3 of 485 communication chip U7. Pin 5 of optocoupler chip U6 is grounded. Pin 2 of optocoupler chip U6 is connected to a 3.3V voltage through resistor R14. Pin 3 of optocoupler chip U6 is electrically connected to the control unit.

[0013] Pin 8 of the optocoupler chip U8 is used to connect to the working power supply and is electrically connected to one end of resistor R17 and one end of capacitor C4 respectively. The other end of resistor R17 and the other end of capacitor C4 are electrically connected to pin 7 of optocoupler chip U8 respectively. One end of resistor R18 is used to connect to 3.3V voltage. The other end of resistor R18 is electrically connected to the control unit and pin 6 of optocoupler chip U8 respectively. Pin 5 of optocoupler chip U8 is grounded. Pin 2 of optocoupler chip U8 is connected to the working power supply through resistor R20. Pin 3 of optocoupler chip U8 is electrically connected to pin 1 of 485 communication chip U7.

[0014] Pin 8 of the 485 communication chip U7 is used to connect to the working power supply and is electrically connected to one end of capacitor C3 and one end of resistor R16. The other end of capacitor C3 is grounded. The other end of resistor R16 is electrically connected to one end of resistor R19, pin 6 of the 485 communication chip U7, and the first connection terminal of TVS diode D6. The other end of resistor R19 is electrically connected to pin 7 of the 485 communication chip U7, one end of resistor R15, and the first connection terminal of TVS diode D5. The other end of resistor R14 is grounded. The second connection terminals of TVS diode D6 and TVS diode D5 are both grounded.

[0015] In one embodiment, the optocoupler chip U5, optocoupler chip U6, and optocoupler chip U8 are all model number 6N137.

[0016] In one embodiment, the 485 communication chip U7 is model number 6N137.

[0017] In one embodiment, the present invention further includes a short-circuit circuit, which includes a resistor R1. One end of the resistor R1 is electrically connected to the control unit, and the other end of the resistor R1 is electrically connected to the base of the transistor Q1 and grounded through a resistor R2. The collector of the transistor Q1 is electrically connected to pin 2 of the optocoupler U2. Pin 1 of the optocoupler U2 receives a 5V voltage. Pin 4 of the optocoupler U2 is electrically connected to pins 2 and 4 of the relay U1. Pin 1 of the relay U1 is used to receive a 12V voltage and is electrically connected to the cathode of the diode D1. The anode of the diode D1 is electrically connected to pin 2 of the relay U1. Pin 3 of the relay U1 is used to receive a 12V voltage and is electrically connected to the cathode of the diode D1. The anode of the diode D1 is electrically connected to pin 4 of the relay U1. Pin 5 of the relay U1 is electrically connected to pin 7 of the relay U1. Pin 6 of the relay U1 is electrically connected to pin 8 of the relay U1. Pin 3 of the optocoupler U2 is grounded through a resistor R3.

[0018] The emitter of transistor Q1 is grounded through resistor R4 and electrically connected to the gate of MOSFET M1. The source of MOSFET M1 is connected to a 5V voltage. The drain of MOSFET M1 is electrically connected to pin 1 of optocoupler U4. Pin 2 of optocoupler U4 is electrically connected to the collector of transistor Q2 through resistor R6. The base of transistor Q2 is electrically connected to the control unit through resistor R5 and grounded through resistor R7. The emitter of transistor Q2 is grounded. Pin 3 of optocoupler U4 is grounded through resistor R8. Pin 4 of optocoupler U4... The pins are electrically connected to pins 2 and 4 of relay U3 respectively. Pin 1 of relay U3 is used to connect to 12V voltage and is electrically connected to the cathode of diode D3. The anode of diode D3 is electrically connected to pin 2 of relay U3. Pin 3 of relay U3 is used to connect to 12V voltage and is electrically connected to the cathode of diode D4. The anode of diode D4 is electrically connected to pin 4 of relay U3. Pin 5 of relay U3 is electrically connected to pin 7 of relay U3. Pin 6 of relay U3 is electrically connected to pin 8 of relay U3.

[0019] In one embodiment, both relays U1 and U3 are model FTR-J2AK012W.

[0020] In one embodiment, the power supply unit includes a first voltage conversion unit and a second voltage conversion unit. The first voltage conversion unit is used to convert AC voltage into 12V voltage and 5V voltage, and the second voltage conversion unit is used to convert 5V voltage into 3.3V voltage.

[0021] In one embodiment, the first voltage conversion unit includes a voltage conversion chip of model number LHE20-20D0512-06, and the second voltage conversion unit includes a voltage conversion chip of model number LD1117.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: In actual use, the control unit of this utility model adjusts the voltage and current output of the programmable adjustable three-phase power supply through the first communication unit, thereby providing a corresponding test environment according to the actual application scenario of the control relay, ensuring that the test results are true and reliable; in addition, in actual testing, the staff only needs to connect the control relay to the programmable adjustable three-phase power supply, which simplifies the test and reduces the amount of manual work. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the present invention as shown in the embodiments;

[0024] Figure 2 This is a circuit diagram of the 485 communication unit in the embodiment;

[0025] Figure 3 This is a circuit diagram of the shorting circuit in the embodiment;

[0026] Figure 4 This is a circuit diagram of the first voltage conversion unit in the embodiment;

[0027] Figure 5 This is a circuit diagram of the second voltage conversion unit in the embodiment. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0029] like Figure 1 As shown, the control relay testing device provided in this embodiment includes a power supply unit 1, a control unit 2, a first communication unit 3, a second communication unit 4, and a programmable adjustable three-phase power supply 5;

[0030] The power supply unit 1 is used to provide operating voltage for the control unit 2, the first communication unit 3, and the second communication unit 4; the control unit 2 is electrically connected to the programmable adjustable three-phase power supply 5 through the first communication unit 3, and controls the magnitude of the test voltage and test current output by the programmable adjustable three-phase power supply 5.

[0031] The control unit 2 is electrically connected to the second communication unit 4, and obtains the test data of the controlled relay under test through the second communication unit 4.

[0032] In practical use, the control unit 2 of this utility model adjusts the voltage and current output of the programmable three-phase power supply through the first communication unit 3, thereby providing a corresponding test environment according to the actual application scenario of the control relay, ensuring that the test results are true and reliable. In addition, during actual testing, the staff can simply connect the control relay to the programmable three-phase power supply 3, which simplifies the test and reduces the amount of manual work.

[0033] In addition, in this embodiment, the programmable adjustable three-phase power supply 3 is an existing power supply device, which will not be described in detail here; the control unit 2 can use a microcontroller or other control chip, and the model of the microcontroller is set according to actual needs.

[0034] Specifically, in this embodiment, as Figure 1 As shown, the first communication unit 3 includes a 232 communication unit and a network port communication unit. The control unit 2 is electrically connected to the programmable adjustable three-phase power supply 5 through the 232 communication unit and the network port communication unit respectively.

[0035] Specifically, in this embodiment, the second communication unit 4 is a 485 communication unit; wherein the circuit of the 485 communication unit is as follows: Figure 2 As shown, it includes optocoupler chip U5, optocoupler chip U6, optocoupler chip U8 and 485 communication chip U7;

[0036] Pin 8 of optocoupler chip U5 is used to connect to the working power supply and is electrically connected to one end of resistor R9, one end of capacitor C1, and one end of resistor R10. The other end of resistor R9 and the other end of capacitor C1 are electrically connected to pin 7 of optocoupler chip U5. The other end of resistor R10 is electrically connected to pin 6 of optocoupler chip U5 and pin 4 of 485 communication chip U7. Pin 5 of optocoupler chip U5 is grounded. Pin 2 of optocoupler chip U5 is connected to 3.3V voltage through resistor R13. Pin 3 of optocoupler chip U5 is electrically connected to the control unit.

[0037] Pin 8 of optocoupler chip U6 is used to connect to the working power supply and is electrically connected to one end of resistor R11, one end of capacitor C2, and one end of resistor R12. The other end of resistor R11 and the other end of capacitor C2 are electrically connected to pin 7 of optocoupler chip U6. The other end of resistor R12 is electrically connected to pin 6 of optocoupler chip U6 and pins 2 and 3 of 485 communication chip U7. Pin 5 of optocoupler chip U6 is grounded. Pin 2 of optocoupler chip U6 is connected to 3.3V through resistor R14. Pin 3 of optocoupler chip U6 is electrically connected to the control unit.

[0038] Pin 8 of optocoupler chip U8 is used to connect to the working power supply and is electrically connected to one end of resistor R17 and one end of capacitor C4 respectively. The other end of resistor R17 and the other end of capacitor C4 are electrically connected to pin 7 of optocoupler chip U8 respectively. One end of resistor R18 is used to connect to 3.3V voltage. The other end of resistor R18 is electrically connected to the control unit and pin 6 of optocoupler chip U8 respectively. Pin 5 of optocoupler chip U8 is grounded. Pin 2 of optocoupler chip U8 is connected to the working power supply through resistor R20. Pin 3 of optocoupler chip U8 is electrically connected to pin 1 of 485 communication chip U7.

[0039] Pin 8 of the 485 communication chip U7 is used to connect to the operating power supply and is electrically connected to one end of capacitor C3 and one end of resistor R16. The other end of capacitor C3 is grounded. The other end of resistor R16 is electrically connected to one end of resistor R19, pin 6 of the 485 communication chip U7, and the first connection terminal of TVS diode D6. The other end of resistor R19 is electrically connected to pin 7 of the 485 communication chip U7, one end of resistor R15, and the first connection terminal of TVS diode D5. The other end of resistor R14 is grounded. The second connection terminals of TVS diode D6 and TVS diode D5 are both grounded.

[0040] In practical use, through Figure 2 The circuit shown enables high-speed communication when using optocouplers for isolation, thereby improving communication stability.

[0041] In this embodiment, the optocoupler chips U5, U6, and U8 are all model number 6N137; the 485 communication chip U7 is model number 6N137.

[0042] In one implementation, other models of optocoupler chips and 485 communication chips can be selected according to requirements.

[0043] Control relays are used in practical applications with either three-phase or four-phase wiring, depending on the wiring type. To reduce the workload for operators, this utility model also includes, for example... Figure 3 The short-circuit circuit shown is in Figure 2In the circuit, the short-circuit circuit includes resistor R1. One end of resistor R1 is electrically connected to control unit 2, and the other end of resistor R1 is electrically connected to the base of transistor Q1 and grounded through resistor R2. The collector of transistor Q1 is electrically connected to pin 2 of optocoupler U2. Pin 1 of optocoupler U2 receives a 5V voltage. Pin 4 of optocoupler U2 is electrically connected to pins 2 and 4 of relay U1. Pin 1 of relay U1 is used to receive a 12V voltage and is electrically connected to the cathode of diode D1. The anode of diode D1 is electrically connected to pin 2 of relay U1. Pin 3 of relay U1 is used to receive a 12V voltage and is electrically connected to the cathode of diode D1. The anode of diode D1 is electrically connected to pin 4 of relay U1. Pins 5 and 7 of relay U1 are electrically connected. Pins 6 and 8 of relay U1 are electrically connected. Pin 3 of optocoupler U2 is grounded through resistor R3.

[0044] The emitter of transistor Q1 is grounded through resistor R4 and is electrically connected to the gate of MOSFET M1. The source of MOSFET M1 is connected to 5V. The drain of MOSFET M1 is electrically connected to pin 1 of optocoupler U4. Pin 2 of optocoupler U4 is electrically connected to the collector of transistor Q2 through resistor R6. The base of transistor Q2 is electrically connected to the control unit through resistor R5 and grounded through resistor R7. The emitter of transistor Q2 is grounded. Pin 3 of optocoupler U4 is grounded through resistor R8. Pin 4 of optocoupler U4... The first pin of relay U3 is connected to pin 2 and pin 4 respectively. Pin 1 of relay U3 is used to connect to 12V voltage and is connected to the cathode of diode D3. The anode of diode D3 is connected to pin 2 of relay U3. Pin 3 of relay U3 is used to connect to 12V voltage and is connected to the cathode of diode D4. The anode of diode D4 is connected to pin 4 of relay U3. Pin 5 of relay U3 is connected to pin 7 of relay U3. Pin 6 of relay U3 is connected to pin 8 of relay U3.

[0045] It should be noted that, in Figure 3 In this circuit, nodes UB_IN and UN_IN are both output terminals of a programmable adjustable three-phase power supply. Control unit 2 controls whether the coil of relay U1 is energized by controlling the on / off state of transistor Q1, thereby controlling whether nodes UB_IN and UN_IN are connected, ultimately realizing the switching between three-phase and four-phase wiring methods without manual switching. In addition, the use of MOSFET M1, transistor Q2, optocoupler U4, and relay U3 can effectively solve the problems of software control error prevention and system crashes, avoiding the sticking, jittering, and operational errors that occur when using relays directly as control circuits.

[0046] In addition, in this embodiment, the model of both relay U1 and relay U3 is FTR-J2AK012W.

[0047] Specifically, in this embodiment, as Figure 1 As shown, the power supply unit 1 includes a first voltage conversion unit and a second voltage conversion unit. The first voltage conversion unit is used to convert AC voltage into 12V voltage and 5V voltage, and the second voltage conversion unit is used to convert 5V voltage into 3.3V voltage.

[0048] More specifically, in this embodiment, such as Figure 4 As shown, the first voltage conversion unit includes a voltage conversion chip U11 with model number LHE20-20D0512-06, such as... Figure 5 As shown, the second voltage conversion unit includes a voltage conversion chip U10 with the model number LD1117.

[0049] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A control relay testing device, characterized by, It includes a power supply unit, a control unit, a first communication unit, a second communication unit, and a programmable adjustable three-phase power supply; The power supply unit is used to provide operating voltage for the control unit, the first communication unit and the second communication unit; the control unit is electrically connected to the programmable three-phase power supply through the first communication unit, and controls the magnitude of the test voltage and the magnitude of the test current output by the programmable three-phase power supply. The control unit is electrically connected to the second communication unit, and obtains the test data of the controlled relay under test through the second communication unit.

2. A control relay testing device according to claim 1, wherein The first communication unit includes a 232 communication unit and a network port communication unit. The control unit is electrically connected to the programmable adjustable three-phase power supply through the 232 communication unit and the network port communication unit, respectively.

3. The control relay testing device of claim 1, wherein, The second communication unit is a 485 communication unit.

4. A control relay testing device according to claim 3, wherein The 485 communication unit includes an optocoupler chip U5, an optocoupler chip U6, an optocoupler chip U8, and a 485 communication chip U7; Pin 8 of the optocoupler chip U5 is used to connect to the working power supply and is electrically connected to one end of resistor R9, one end of capacitor C1, and one end of resistor R10. The other end of resistor R9 and the other end of capacitor C1 are electrically connected to pin 7 of optocoupler chip U5. The other end of resistor R10 is electrically connected to pin 6 of optocoupler chip U5 and pin 4 of 485 communication chip U7. Pin 5 of optocoupler chip U5 is grounded. Pin 2 of optocoupler chip U5 is connected to 3.3V voltage through resistor R13. Pin 3 of optocoupler chip U5 is electrically connected to the control unit. Pin 8 of the optocoupler chip U6 is used to connect to the working power supply and is electrically connected to one end of resistor R11, one end of capacitor C2, and one end of resistor R12. The other end of resistor R11 and the other end of capacitor C2 are electrically connected to pin 7 of optocoupler chip U6. The other end of resistor R12 is electrically connected to pin 6 of optocoupler chip U6 and pins 2 and 3 of 485 communication chip U7. Pin 5 of optocoupler chip U6 is grounded. Pin 2 of optocoupler chip U6 is connected to a 3.3V voltage through resistor R14. Pin 3 of optocoupler chip U6 is electrically connected to the control unit. Pin 8 of the optocoupler chip U8 is used to connect to the working power supply and is electrically connected to one end of resistor R17 and one end of capacitor C4 respectively. The other end of resistor R17 and the other end of capacitor C4 are electrically connected to pin 7 of optocoupler chip U8 respectively. One end of resistor R18 is used to connect to 3.3V voltage. The other end of resistor R18 is electrically connected to the control unit and pin 6 of optocoupler chip U8 respectively. Pin 5 of optocoupler chip U8 is grounded. Pin 2 of optocoupler chip U8 is connected to the working power supply through resistor R20. Pin 3 of optocoupler chip U8 is electrically connected to pin 1 of 485 communication chip U7. Pin 8 of the 485 communication chip U7 is used to connect to the working power supply and is electrically connected to one end of capacitor C3 and one end of resistor R16. The other end of capacitor C3 is grounded. The other end of resistor R16 is electrically connected to one end of resistor R19, pin 6 of the 485 communication chip U7, and the first connection terminal of TVS diode D6. The other end of resistor R19 is electrically connected to pin 7 of the 485 communication chip U7, one end of resistor R15, and the first connection terminal of TVS diode D5. The other end of resistor R14 is grounded. The second connection terminals of TVS diode D6 and TVS diode D5 are both grounded.

5. A control relay testing device according to claim 4, wherein The optocoupler chips U5, U6, and U8 are all model number 6N137.

6. A control relay testing device according to claim 4, wherein The model number of the 485 communication chip U7 is 6N137.

7. The control relay testing device of claim 1, wherein, It also includes a shorting circuit, which includes a resistor R1. One end of the resistor R1 is electrically connected to the control unit, and the other end of the resistor R1 is electrically connected to the base of the transistor Q1 and grounded through a resistor R2. The collector of the transistor Q1 is electrically connected to pin 2 of the optocoupler U2. Pin 1 of the optocoupler U2 receives a 5V voltage. Pin 4 of the optocoupler U2 is electrically connected to pins 2 and 4 of the relay U1. Pin 1 of the relay U1 is used to receive a 12V voltage and is electrically connected to the cathode of the diode D1. The anode of the diode D1 is electrically connected to pin 2 of the relay U1. Pin 3 of the relay U1 is used to receive a 12V voltage and is electrically connected to the cathode of the diode D1. The anode of the diode D1 is electrically connected to pin 4 of the relay U1. Pins 5 and 7 of the relay U1 are electrically connected, and pins 6 and 8 of the relay U1 are electrically connected. Pin 3 of the optocoupler U2 is grounded through a resistor R3. The emitter of transistor Q1 is grounded through resistor R4 and electrically connected to the gate of MOSFET M1. The source of MOSFET M1 is connected to a 5V voltage. The drain of MOSFET M1 is electrically connected to pin 1 of optocoupler U4. Pin 2 of optocoupler U4 is electrically connected to the collector of transistor Q2 through resistor R6. The base of transistor Q2 is electrically connected to the control unit through resistor R5 and grounded through resistor R7. The emitter of transistor Q2 is grounded. Pin 3 of optocoupler U4 is grounded through resistor R8. Pin 4 of optocoupler U4... The pins are electrically connected to pins 2 and 4 of relay U3 respectively. Pin 1 of relay U3 is used to connect to 12V voltage and is electrically connected to the cathode of diode D3. The anode of diode D3 is electrically connected to pin 2 of relay U3. Pin 3 of relay U3 is used to connect to 12V voltage and is electrically connected to the cathode of diode D4. The anode of diode D4 is electrically connected to pin 4 of relay U3. Pin 5 of relay U3 is electrically connected to pin 7 of relay U3. Pin 6 of relay U3 is electrically connected to pin 8 of relay U3.

8. A control relay testing device according to claim 7, wherein, Both relays U1 and U3 are model FTR-J2AK012W.

9. The control relay testing device of claim 1, wherein, The power supply unit includes a first voltage conversion unit for converting an alternating voltage into a 12V voltage and a 5V voltage, and a second voltage conversion unit for converting the 5V voltage into a 3.3V voltage.

10. A control relay testing device according to claim 9, wherein, The first voltage conversion unit includes a voltage conversion chip of model LHE20-20D0512-06, and the second voltage conversion unit includes a voltage conversion chip of model LD1117.

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