Batch testing device for off-line relays

Abstract

The utility model relates to a batch testing device for off-line relays. The batch testing device comprises a relay protection tester; the man-machine interaction unit is used for displaying the minimum excitation voltage, the maximum field loss voltage and the contact loop impedance of each off-line relay to be tested; a plurality of test modules; wherein each test module comprises a plurality of sockets which are used for being connected with each off-line relay to be tested in a one-to-one manner and are connected with the relay protection tester; the plurality of sampling resistor units are connected in series with the contact loop of each off-line relay to be tested through a socket and then are connected with the current source output end of the relay protection tester; a plurality of detection units connected in parallel with the plurality of sampling resistor units in a one-to-one manner; and the data processing unit is connected with the relay protection tester, the man-machine interaction unit and the plurality of detection units, and outputs the minimum excitation voltage, the maximum field loss voltage and the contact loop impedance to the man-machine interaction unit. According to the utility model, a plurality of off-line relays can be verified at the same time, and the verification efficiency of the off-line relays is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant equipment maintenance, and particularly relates to a batch testing device for offline relays. Background Art

[0002] Relays in nuclear power plants generally need to be calibrated every eighteen months. For some relays with bases that can be unplugged (i.e., offline relays) during calibration, the relays are first unplugged from the bases, and then a series of measuring instruments (including multimeters, relay protection testers, etc.) are used to test parameters such as the contact resistance of the relays one by one. However, due to the low testing efficiency of this testing method and the large number of relays to be tested, a large amount of human resources and a lot of time are required to avoid delaying the calibration schedule. Therefore, there is an urgent need for a tool in nuclear power plants to quickly calibrate offline relays. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a batch testing device for offline relays.

[0004] The technical solution adopted by the utility model to solve its technical problem is: to construct a batch testing device for offline relays, including:

[0005] A relay protection tester;

[0006] A human-computer interaction unit for displaying the minimum excitation voltage, maximum demagnetization voltage, and contact loop impedance of each offline relay to be tested;

[0007] A number of test modules;

[0008] Wherein, each of the test modules includes:

[0009] A plurality of sockets for one-to-one connection to each of the offline relays to be tested and connected to the relay protection tester to input the voltage signal output by the relay protection tester into the coils of each of the offline relays to be tested;

[0010] A plurality of sampling resistance units, which are connected in series with the contact loops of each of the offline relays to be tested one by one through the sockets and connected to the current source output terminal of the relay protection tester to receive the current signal output by the relay protection tester;

[0011] A plurality of detection units, which are connected in parallel with the plurality of sampling resistance units one by one. Each of the detection units measures the voltage across the sampling resistance unit connected thereto and outputs a corresponding detection signal;

[0012] A data processing unit, connected to the relay protection tester, the human-machine interaction unit, and multiple detection units, for outputting the minimum excitation voltage, the maximum field-loss voltage, and the contact loop impedance to the human-machine interaction unit.

[0013] Preferably, each of the test modules further includes:

[0014] A coil switch control unit, connected to the data processing unit, the voltage source output terminal of the relay protection tester, and multiple sockets, for controlling the on-off between the voltage source output terminal of the relay protection tester and the coils of the offline relays to be tested;

[0015] A contact switch control unit, connected to the data processing unit, the current source output terminal of the relay protection tester, and each sampling resistor unit, for controlling the on-off between the current source output terminal of the relay protection tester and each sampling resistor unit.

[0016] Preferably, the coil switch control unit includes a relay K2, a diode D2, and an NPN transistor Q2; the first end of the coil of the relay K2 is connected to the cathode of the diode D2 and the relay drive power supply, the second end of the coil of the relay K2 is connected to the anode of the diode D2 and the collector of the NPN transistor Q2, the emitter of the NPN transistor Q2 is grounded, the base of the NPN transistor Q2 is connected to the data processing unit, the fixed contact of the relay K2 is connected to the voltage source output terminal of the relay protection tester, and the moving contact of the relay K2 is connected to the coils of the offline relays to be tested through the socket;

[0017] The contact switch control unit includes a relay K1, a diode D1, and an NPN transistor Q1; the first end of the coil of the relay K1 is connected to the cathode of the diode D1 and the relay drive power supply, the second end of the coil of the relay K1 is connected to the anode of the diode D1 and the collector of the NPN transistor Q1, the emitter of the NPN transistor Q1 is grounded, the base of the NPN transistor Q1 is connected to the data processing unit, the fixed contact of the relay K1 is connected to the current source output terminal of the relay protection tester, and the moving contact of the relay K1 is connected to each sampling resistor unit.

[0018] Preferably, each of the test modules further includes:

[0019] A storage box, the storage box includes a top surface and a cavity, each of the sockets is arranged on the top surface, and the data processing unit, the coil switch control unit, the contact switch control unit, multiple sampling resistor units, and multiple detection units are arranged in the cavity.

[0020] Preferably, each of the test modules further includes:

[0021] A connector is provided on the top surface and is detachably connected to the voltage source output terminal and the current source output terminal of the relay protection tester.

[0022] Preferably, each of the test modules further includes:

[0023] An expansion interface is provided on the top surface for connecting to the expansion interfaces included in other test modules, enabling multiple sockets included in each test module to be connected to the relay protection tester, and enabling the data processing units included in each test module to communicate with the human-machine interaction unit.

[0024] Preferably, each of the detection units includes a current induction amplifier U1;

[0025] The positive terminal and the negative terminal of the current induction amplifier U1 are connected in parallel with one of the sampling resistor units, and the output terminal of the current induction amplifier U1 is connected to the data processing unit.

[0026] Preferably, each of the sampling resistor units includes a resistor R11 and a resistor R12; the first end of the resistor R11 is connected to the first end of the resistor R12 and the positive terminal of the current induction amplifier U1, the first end of the resistor R11 is connected to the current source output terminal of the relay protection tester, the second end of the resistor R11 is connected to the second end of the resistor R12 and the negative terminal of the current induction amplifier U1, and the second end of the resistor R11 is also connected to the contact circuit of a to-be-tested offline relay through one of the sockets.

[0027] Preferably, the number of the multiple sockets is 10.

[0028] Preferably, the multiple sockets include relay sockets of model CR-M4SS.

[0029] Implementing the present utility model has the following beneficial effects: An offline relay batch testing device can not only simultaneously calibrate multiple offline relays, but also simplify the calibration work of offline relays, significantly improve the calibration efficiency of offline relays, and help shorten the calibration construction period of offline relays. Description of the Drawings

[0030] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0031] Figure 1 is the circuit structure diagram of an embodiment of the offline relay batch testing device of the present utility model;

[0032] Figure 2 is the circuit schematic diagram of an embodiment of the offline relay batch testing device of the present utility model;

[0033] Figure 3 It is a schematic structural diagram of an embodiment of the off-line relay batch testing device of the present utility model. Specific embodiments

[0034] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.

[0035] In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings and are constructed and operated in a specific orientation, and are only for the convenience of describing the technical solution, rather than indicating that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0036] See Figure 1 , the present utility model provides an off-line relay batch testing device, which can simultaneously calibrate multiple off-line relays, simplify the calibration work of off-line relays, improve the efficiency of off-line relay calibration in nuclear power plants, and significantly shorten the calibration period of off-line relays. In addition, an off-line relay refers to a relay that can be removed from the base in a nuclear power plant. As Figure 1 shown, the off-line relay batch testing device includes a relay protection tester 2, a human-machine interaction unit 3, and a plurality of test modules 4.

[0037] Among them, the relay protection tester 2 can be an existing relay protection tester, and its function is to provide a voltage signal for exciting the driving coil of the off-line relay to be tested and a current signal for testing the closed contact circuit in the off-line relay to be tested. Of course, the relay protection tester 2 can also be replaced by existing current sources and voltage sources. However, considering that off-line relays are very convenient to be collected in the laboratory for unified calibration after being removed, and a certain amount of relay protection testers 2 are already equipped in nuclear power plants, it is therefore preferred to use the relay protection tester 2 to provide the voltage signal and current signal for testing.

[0038] The human-machine interaction unit 3 is connected to the test module 4 to obtain relevant data, so as to display the minimum excitation voltage, maximum demagnetization voltage, and contact circuit impedance of each off-line relay to be tested. Among them, the human-machine interaction unit 3 can be a terminal device such as a computer.

[0039] Please see Figure 1 , in one embodiment, each test module 4 can include a plurality of sockets 41, a plurality of sampling resistor units 42, a plurality of detection units 43, and a data processing unit 44.

[0040] Each socket 41 is used to connect each offline relay to be tested one by one and is connected to the relay protection tester 2 to input the voltage signal output by the relay protection tester 2 into the coil of each offline relay to be tested. Specifically, the function of the socket 41 is that when the offline relay to be tested is inserted into the socket 41, the coil of the offline relay to be tested can be connected to the relay protection tester 2 to obtain a voltage signal that can control the excitation or demagnetization of the coil, and each contact circuit of the offline relay to be tested is connected to the relay protection tester 2 one by one through the sampling resistor unit 42 to obtain the current signal output by the relay protection tester 2, preparing for measuring the impedance of the contact circuit.

[0041] Since there are a large number of relays of ABB company used in a certain nuclear power plant, and most of the relay base models used are CR-M4SS, so the multiple sockets 41 described above can include multiple relay sockets of model CR-M4SS. Of course, the specific model of the socket 41 can also be determined by the offline relay to be tested, and generally it is sufficient to be consistent with the base model of the relevant offline relay to be tested.

[0042] Each sampling resistor unit 42 is connected in series with the contact circuit of each offline relay to be tested one by one through the socket 41 and then connected to the current source output terminal of the relay protection tester 2 to receive the current signal output by the relay protection tester 2. Specifically, the offline relay to be tested may include several contact circuits, and each sampling resistor unit 42 is connected to one contact circuit in the offline relay to be tested one by one, and each socket 41 can connect one offline relay to be tested, that is, the number of sampling resistor units 42 is determined by the total number of contact circuits that all sockets 41 can connect.

[0043] Multiple detection units 43 are connected in parallel with multiple sampling resistor units 42 one by one. Each detection unit 43 measures the voltage across the sampling resistor unit 42 connected to it, and outputs a corresponding detection signal to the data processing unit 44 according to the magnitude of the voltage across the sampling resistor unit 42. It can be understood that the detection signal can represent the magnitude of the voltage across the sampling resistor unit 42.

[0044] Please refer to Figure 2 , in one embodiment, each detection unit 43 may include a current sensing amplifier U1. The positive terminal and the negative terminal of the current sensing amplifier U1 are connected in parallel with a sampling resistor unit 42 to generate a detection signal according to the magnitude of the voltage across the sampling resistor unit 42. The output terminal of the current sensing amplifier U1 is connected to the data processing unit 44 to input the detection signal described above to the data processing unit 44. Among them, the model of the current sensing amplifier U1 can be INA193.

[0045] Furthermore, please refer to Figure 2, each detection unit 43 may include a resistor R1 and a capacitor C1. The output terminal of the current sensing amplifier U1 is connected to the data processing unit 44 via a resistor R2. The resistor R2 functions as a current limiter to prevent the data processing unit 44 from being damaged due to overcurrent of the input detection signal. The connection point between the resistor R2 and the data processing unit 44 is connected to the ground via a capacitor C1. The capacitor C1 functions as a filter to filter out part of the noise in the detection signal and improve the transmission quality of the detection signal.

[0046] Correspondingly, please refer to Figure 2 , each sampling resistor unit 42 may include a resistor R11 and a resistor R12. The first end of the resistor R11 is connected to the first end of the resistor R12 and the positive terminal of the current sensing amplifier U1. The first end of the resistor R11 is connected to the current source output terminal of the relay protection tester 2. The second end of the resistor R11 is connected to the second end of the resistor R12 and the negative terminal of the current sensing amplifier U1. The second end of the resistor R11 is also connected to the contact circuit of a to-be-tested offline relay via a socket 41.

[0047] The data processing unit 44 is connected to the relay protection tester 2, the human-machine interaction unit 3, and multiple detection units 43 to output the minimum excitation voltage, the maximum demagnetization voltage, and the contact circuit impedance of the to-be-tested offline relay to the human-machine interaction unit 3. Specifically, the data processing unit 44 may include an existing microprocessor or a single-chip microcomputer, whose function is to obtain the excitation and demagnetization moments of the to-be-tested relay, the magnitude of the test voltage of the voltage source and the current source in the relay protection tester 2, and obtain the detection signal output by the detection unit 43 to determine the minimum excitation voltage, the maximum demagnetization voltage, and the contact circuit impedance of the to-be-tested offline relay according to the test voltage, the detection signal, and the impedance magnitude of the sampling resistor unit 42.

[0048] Please refer to Figure 2 , the determination principles of the minimum excitation voltage, the maximum demagnetization voltage, and the contact circuit impedance are as follows:

[0049] First, the voltage source output terminal of the relay protection tester 2 outputs a voltage signal that gradually increases from 0V to the coil of the to-be-tested offline relay 1. When the voltage signal rises to the minimum excitation voltage (also called the operating voltage) of the to-be-tested offline relay 1, the coil of the to-be-tested offline relay 1 is excited, and the normally open contact circuit of the to-be-tested offline relay 1 is attracted, so that the normally open contact circuit is connected to the sampling resistor unit 42 and the current source output terminal of the relay protection tester 2. Since the current source output terminal of the relay protection tester 2 continuously outputs a current signal throughout the test process, a voltage drop is formed across both ends of the sampling resistor unit 42 at this time, and this voltage drop will be detected by the detection unit 43. The detection unit 43 will output a detection signal proportional to this voltage drop to the data processing unit 44;

[0050] Since the normally open contact circuit will also cause a rising edge in the detection signal at the moment of closing, when the data processing unit 44 detects a rising edge in the detection signal output by a certain detection unit 43, it can determine this moment as the excitation moment of the offline relay 1 to be measured connected to the detection unit 43. At this time, the voltage output by the voltage source output terminal of the relay protection tester 2 is the minimum excitation voltage of the offline relay 1 to be measured. It should be noted that the data processing unit 44 can communicate with the relay protection tester 2 to obtain the voltage magnitudes output by the voltage source output terminal and the current source output terminal of the relay protection tester 2 at the excitation and demagnetization moments of the offline relay 1 to be measured.

[0051] In addition, the detection signal can represent the voltage across the sampling resistor unit 42, and the sampling resistor unit 42 can be pre-stored in the data processing unit 44. Therefore, the magnitude of the current flowing through the sampling resistor unit 42 can be calculated using existing software algorithms. Since the detection unit 43 is in a high-impedance state, the current flowing through the normally open contact circuit is approximately equal to the current flowing through the sampling resistor unit 42. Then, by dividing the voltage output by the voltage source output terminal at the same moment by the current flowing through the sampling resistor unit 42, the sum of the contact circuit impedance of the sampling resistor unit 42 and the normally open contact circuit can be obtained. Subtracting the resistance value of the sampling resistor unit 42 from this sum gives the contact circuit impedance.

[0052] Next, after all the offline relays to be measured are excited, the voltage signal output by the voltage source output terminal of the relay protection tester 2 to the coils of each offline relay 1 to be measured gradually decreases. When the voltage signal drops to the maximum demagnetization voltage (also called the return voltage) of a certain offline relay 1 to be measured, the coil of the offline relay 1 to be measured demagnetizes, which causes a falling edge in the detection signal output by the connected detection unit 43. At this time, the data processing unit 44 can determine the voltage output by the voltage source output terminal of the relay protection tester 2 as the maximum demagnetization voltage of the offline relay 1 to be measured.

[0053] Please refer to Figure 2 In one embodiment, each test module 4 may further include a coil switch control unit 45 and a contact switch control unit 46.

[0054] Please refer to Figure 2 The coil switch control unit 45 is connected to the data processing unit 44, the voltage source output terminal of the relay protection tester 2, and multiple sockets 41 to control the on / off between the voltage source output terminal of the relay protection tester 2 and the coils of each offline relay to be measured.

[0055] Please refer to Figure 2, in one embodiment, the coil switch control unit 45 may include a relay K2, a diode D2, an NPN transistor Q2, a resistor R5, and a resistor R6. The first end of the coil of the relay K2 is connected to the cathode of the diode D2 and the relay drive power supply. The second end of the coil of the relay K2 is connected to the anode of the diode D2 and the collector of the NPN transistor Q2. The emitter of the NPN transistor Q2 is grounded. The base of the NPN transistor Q2 is connected to the data processing unit 44 via the resistor R5. The connection point between the resistor R5 and the data processing unit 44 is connected to the ground via the resistor R6. The fixed contact of the relay K2 is connected to the voltage source output terminal of the relay protection tester 2. The moving contact of the relay K2 (the moving contact includes a normally closed contact and a normally open contact) is connected to the coils of each offline relay to be tested through the socket 41. In this embodiment, the data processing unit 44 can control the excitation or demagnetization of the relay K2 by controlling the on / off of the NPN transistor Q2. When the relay K2 is excited, the voltage source output terminal of the relay protection tester 2 is connected to the coils of each offline relay to be tested, so that the relay protection tester 2 can input a voltage signal that gradually increases first and then gradually decreases to the coils of each offline relay to be tested to complete the calibration work.

[0056] Please refer to Figure 2 , the contact switch control unit 46 is connected to the data processing unit 44 and each sampling resistor unit 42 at the current source output terminal of the relay protection tester 2 to control the on / off between the current source output terminal of the relay protection tester 2 and each sampling resistor unit 42.

[0057] Please refer to Figure 2 , in one embodiment, the contact switch control unit 46 includes a relay K1, a diode D1, an NPN transistor Q1, a resistor R3, and a resistor R4. The first end of the coil of the relay K1 is connected to the cathode of the diode D1 and the relay drive power supply. The second end of the coil of the relay K1 is connected to the anode of the diode D1 and the collector of the NPN transistor Q1. The emitter of the NPN transistor Q1 is grounded. The base of the NPN transistor Q1 is connected to the data processing unit 44 via the resistor R3. The connection point between the resistor R3 and the data processing unit 44 is connected to the ground via the resistor R4. The fixed contact of the relay K1 is connected to the current source output terminal of the relay protection tester 2. The moving contact of the relay K1 is connected to each sampling resistor unit 42.

[0058] In this embodiment, the data processing unit 44 can control the excitation or demagnetization of the relay K1 by controlling the on / off of the NPN transistor Q1. When the relay K1 is excited, the current source output terminal of the relay protection tester 2 is connected to the contact circuits of each offline relay to be tested, so that the relay protection tester 2 can input a current signal for testing to each contact circuit to complete the calibration work.

[0059] Please refer to Figure 3, in one embodiment, each test module 4 may further include a storage box 47. The storage box 47 includes a top surface 471 and a cavity. Each socket 41 is provided on the top surface 471, and the data processing unit 44, the coil switch control unit 45, the contact switch control unit 46, a plurality of sampling resistor units 42, and a plurality of detection units 43 are provided in the cavity of the storage box 47.

[0060] Please refer to Figure 3 , in one embodiment, each test module 4 may further include a connector 48. The connector 48 is provided on the top surface 471, and the connector 48 is detachably connected to the voltage source output terminal and the current source output terminal of the relay protection tester 2. Among them, the connector 48 may include a plurality of female interfaces. For example, interfaces of sizes such as 3.5 mm are acceptable, and the model of the female interface may be determined by the models of the output plugs of the voltage source and the current source of the relay protection tester 2.

[0061] Please refer to Figure 1 and Figure 3 , in one embodiment, each test module 4 may further include an expansion interface 49. The expansion interface 49 is provided on the top surface 471. The expansion interface 49 can be connected to the expansion interfaces included in other test modules 4, so that the plurality of sockets 41 included in each test module 4 are connected to the relay protection tester 2, and the data processing unit 44 included in each test module 4 is communicatively connected to the human-machine interaction unit 3. Specifically, the expansion interface 49 may include two expansion female sockets. After each test module 4 is connected using the expansion interface 49 and a cable, the voltage source output terminal of the relay protection tester 2 will be connected in parallel to the pins of the plurality of sockets 41 included in each test module 4 that are used to connect the coils of the offline relays to be tested, so that a single relay protection tester 2 can provide a voltage signal for controlling the excitation or demagnetization of the coils of the offline relays to be tested in multiple test modules 4. Moreover, the current source output terminal of the relay protection tester 2 will also be connected in parallel to the pins of the plurality of sockets 41 included in each test module 4 that are used to connect the contact circuits of the offline relays to be tested, so that a single relay protection tester 2 can simultaneously provide a current signal for testing the contact circuits of the offline relays to be tested in multiple test modules 4. At the same time, the data processing units 44 in each test module 4 can also establish a communication channel through the expansion interface 49, so that each data processing unit 44 can output the self-check minimum excitation voltage, the maximum demagnetization voltage, and the contact circuit impedance corresponding to the multiple offline relays it checks to the human-machine interaction unit 3.

[0062] It can be understood that in this embodiment, by adding the expansion interface 49, each test module 4 can realize the expansion of the interface, so that a single relay protection tester 2 and a single human-machine interaction unit 3 can cooperate with multiple test modules 4 at the same time to check a large number of offline relays simultaneously.

[0063] Please refer to Figure 3, in one embodiment, the number of the plurality of sockets 41 may be 10.

[0064] Understandably, after the off-line relay to be tested is inserted into the socket in the present utility model, the verification work of the off-line relay can be quickly completed by using the existing algorithm. It can not only verify multiple off-line relays simultaneously, but also simplify the verification work of the off-line relay, significantly improving the verification efficiency of the off-line relay and helping to shorten the verification period of the off-line relay.

[0065] It can be understood that the above embodiments only express the preferred embodiments of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, all of which belong to the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. An off-line relay batch testing device, characterized in that: include: Relay protection tester (2); A human-machine interaction unit (3) is used to display the minimum excitation voltage, maximum demagnetization voltage and contact loop impedance of each offline relay to be tested; Several test modules (4); Wherein, each of the test modules (4) comprises: A plurality of sockets (41) are used for one-to-one access to each of the offline relays to be tested, and are connected to the relay protection tester (2) so as to input the voltage signal output by the relay protection tester (2) into the coil of each of the offline relays to be tested; A plurality of sampling resistor units (42) are connected in series one-to-one with the contact circuits of the offline relays to be tested through the socket (41) and then connected to the current source output end of the relay protection tester (2) to receive the current signal output by the relay protection tester (2); A plurality of detection units (43) are connected in parallel with the plurality of sampling resistor units (42) one by one, each of the detection units (43) measuring the voltage across the sampling resistor unit (42) connected thereto and outputting a corresponding detection signal; A data processing unit (44) is connected to the relay protection tester (2), the human-machine interaction unit (3) and a plurality of detection units (43) to output the minimum excitation voltage, the maximum demagnetization voltage and the contact loop impedance to the human-machine interaction unit (3).

2. The off-line relay batch testing device according to claim 1, characterized in that: Each of the test modules (4) further comprises: A coil switch control unit (45) is connected to the data processing unit (44), the voltage source output end of the relay protection tester (2) and a plurality of sockets (41) to control the on / off between the voltage source output end of the relay protection tester (2) and the coils of each of the offline relays to be tested; A contact switch control unit (46) is connected to the data processing unit (44), the current source output end of the relay protection tester (2) and each sampling resistor unit (42) to control the on / off between the current source output end of the relay protection tester (2) and each sampling resistor unit (42).

3. The off-line relay batch testing device according to claim 2, characterized in that: The coil switch control unit (45) comprises a relay K2, a diode D2 and an NPN transistor Q2; a first end of the coil of the relay K2 is connected to the cathode of the diode D2 and the relay driving power supply, a second end of the coil of the relay K2 is connected to the anode of the diode D2 and the collector of the NPN transistor Q2, the emitter of the NPN transistor Q2 is grounded, the base of the NPN transistor Q2 is connected to the data processing unit (44), the fixed contact of the relay K2 is connected to the voltage source output end of the relay protection tester (2), and the moving contact of the relay K2 is connected to the coil of each of the offline relays to be tested through the socket (41); The contact switch control unit (46) comprises a relay K1, a diode D1 and an NPN transistor Q1; the first end of the coil of the relay K1 is connected to the cathode of the diode D1 and the relay driving power supply, the second end of the coil of the relay K1 is connected to the anode of the diode D1 and the collector of the NPN transistor Q1, the emitter of the NPN transistor Q1 is grounded, the base of the NPN transistor Q1 is connected to the data processing unit (44), the fixed contact of the relay K1 is connected to the current source output end of the relay protection tester (2), and the moving contact of the relay K1 is connected to each of the sampling resistor units (42).

4. The off-line relay batch testing device according to claim 2, characterized in that: Each of the test modules (4) further comprises: A storage box (47), the storage box (47) comprising a top surface (471) and a cavity, each of the sockets (41) being arranged on the top surface (471), and the data processing unit (44), the coil switch control unit (45), the contact switch control unit (46), a plurality of sampling resistor units (42) and a plurality of detection units (43) being arranged in the cavity.

5. The off-line relay batch testing device according to claim 4, characterized in that: Each of the test modules (4) further comprises: The connector (48) is arranged on the top surface (471) and is detachably connected to the voltage source output terminal and the current source output terminal of the relay protection tester (2).

6. The off-line relay batch testing device according to claim 4, characterized in that: Each of the test modules (4) further comprises: An expansion interface (49) is provided on the top surface (471) and is used to connect to expansion interfaces included in other test modules (4), connect a plurality of sockets (41) included in each test module (4) with the relay protection tester (2), and enable a data processing unit (44) included in each test module (4) to communicate with the human-computer interaction unit (3).

7. The off-line relay batch testing device according to claim 1, characterized in that: Each of the detection units (43) comprises a current sensing amplifier U1; The positive end and the negative end of the current sensing amplifier U1 are connected in parallel to a sampling resistor unit (42), and the output end of the current sensing amplifier U1 is connected to the data processing unit (44).

8. The off-line relay batch testing device according to claim 7, characterized in that: Each sampling resistor unit (42) comprises a resistor R11 and a resistor R12; the first end of the resistor R11 is connected to the first end of the resistor R12 and the positive end of the current sensing amplifier U1, the first end of the resistor R11 is connected to the current source output end of the relay protection tester (2), the second end of the resistor R11 is connected to the second end of the resistor R12 and the negative end of the current sensing amplifier U1, and the second end of the resistor R11 is also connected to a contact loop of the offline relay to be tested via a socket (41).

9. The off-line relay batch testing device according to claim 1, characterized in that: The number of the plurality of sockets (41) is ten.

10. The off-line relay batch testing device according to claim 1, characterized in that: The plurality of sockets (41) include a relay socket of model CR-M4SS.

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