Nuclear power plant relay on-line batch verification device

Abstract

The utility model relates to a nuclear power plant relay on-line batch verification device. The nuclear power plant relay on-line batch verification device comprises a plurality of connectors used for connecting a plurality of on-line tested relays; the test signal supply unit is used for outputting adjustable voltage and current signals to each tested relay and receiving pulse signals; the plurality of sampling units are used for outputting sampling signals based on the contact closing resistance of the corresponding tested relay; the loop voltage receiving unit is used for receiving loop voltage input to a test loop by the test signal supply unit and sampling signals output by the sampling units; the processing unit is used for outputting a pulse signal when a contact of each tested relay is closed and turned off so as to obtain a relay operation voltage and a relay return voltage, and outputting a contact closing resistance; and the battery unit is used for supplying power to the processing unit and each sampling unit. According to the utility model, the relays can be verified on line in batches, and the verification efficiency and accuracy of the on-line relays can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of relay calibration, in particular to an on-line batch calibration device for nuclear power plant relays. Background Technique

[0002] A large number of conventional relays are used in nuclear power plants, and these relays need to be calibrated regularly. The existing relay protection tester can only calibrate one relay at a time. For relays that cannot be disassembled or are difficult to disassemble, the relays are usually calibrated in an on-line form, specifically including: removing the external wires of the relay, connecting the relay protection tester to the relay to be tested, one person operating the relay protection tester to slowly increase the voltage input to the excitation coil of the relay to be tested, stopping boosting when the relay contacts actuate, another person recording the actuation voltage, simultaneously measuring the resistance of each normally open contact with a multimeter, and recording the data; subsequently, operating to reduce the voltage, stopping reducing the voltage when the relay returns, recording the return voltage, simultaneously measuring the resistance of each normally closed contact, and recording the data; for the calibration of thousands of relays during the maintenance of nuclear power plant units, each relay needs to be calibrated one by one, which not only requires multiple people to operate, but also has a large workload, low calibration efficiency, consumes a lot of time, and has a high risk of human error, and it is easy to have inaccurate test situations. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an on-line batch calibration device for nuclear power plant relays.

[0004] The technical solution adopted by the utility model to solve its technical problem is to construct an on-line batch calibration device for nuclear power plant relays, including:

[0005] A plurality of connectors for connecting a plurality of relays to be tested on-line;

[0006] A test signal supply unit for outputting adjustable voltage and current signals to each of the relays to be tested and receiving pulse signals;

[0007] A plurality of sampling units for outputting sampling signals based on the contact closing resistance of the corresponding relays to be tested, and each of the sampling units, a contact loop of a relay to be tested, and the test signal supply unit form a test loop through at least one of the connectors;

[0008] A processing unit for receiving the loop voltage input by the test signal supply unit to the test loop and the sampling signals output by each of the sampling units, outputting the pulse signals when the contacts of each of the relays to be tested are closed and turned off to obtain the relay actuation voltage and the relay return voltage, and outputting the contact closing resistance, and the processing unit is connected to the test signal supply unit and the plurality of sampling units; and

[0009] A battery unit for powering the processing unit and each of the sampling units.

[0010] Preferably, each of the sampling units includes a current sensing amplifier U1, a sampling resistor, a second resistor R2, and a first capacitor C1;

[0011] The positive terminal of the current sensing amplifier U1 is connected to the first current signal output terminal of the test signal supply unit, and the negative terminal is connected to the second current signal output terminal of the test signal supply unit through the contact circuit of at least one of the connectors and a measured relay. The positive terminal of the current sensing amplifier U1 is also connected to the negative terminal of the current sensing amplifier U1 through the sampling resistor. The output terminal of the current sensing amplifier U1 is connected to the processing unit through the second resistor R2, and the connection node between the second resistor R2 and the processing unit is grounded through the first capacitor C1.

[0012] Preferably, the current sensing amplifier U1 is a current sensing amplifier of model I NA193.

[0013] Preferably, the on-line batch verification device for nuclear power plant relays further includes:

[0014] A first switch unit, the control terminal of the first switch unit is connected to the processing unit, and one end of the switch circuit of the first switch unit is simultaneously connected to the positive terminals of each of the current sensing amplifiers U1, and the other end is connected to the first current signal output terminal of the test signal supply unit; and

[0015] A second switch unit, the control terminal of the second switch unit is connected to the processing unit, and one end of the switch circuit of the second switch unit is connected to the adjustable voltage output terminal of the test signal supply unit, and the other end is connected to the excitation coils of each of the measured relays one-to-one through a plurality of the connectors.

[0016] Preferably, the first switch unit and the second switch unit respectively include a relay K1, a diode D2, a first switch tube Q1, a first resistor R1, and a fifth resistor R5;

[0017] One end of the normally open circuit of the relay K1 included in the first switch unit is simultaneously connected to the positive terminals of each of the current sensing amplifiers U1, and the other end is connected to the first current signal output terminal of the test signal supply unit. One end of the normally open circuit of the relay K1 included in the second switch unit is connected to the adjustable voltage output terminal of the test signal supply unit, and the other end is connected to the excitation coils of each of the measured relays one-to-one through a plurality of the connectors;

[0018] One end of the exciting coil of the relay K1 is connected to the first DC power supply and the cathode of the diode D2, and the other end is connected to the anode of the diode D2 and the input pole of the first switching transistor Q1. The output end of the first switching transistor Q1 is grounded, and one path of the control end of the first switching transistor Q1 is connected to the processing unit through the first resistor R1, and the other path is grounded through the fifth resistor R5.

[0019] Preferably, the test signal supply unit includes:

[0020] An adjustable power supply for outputting the adjustable voltage, one end of the adjustable power supply is connected to the second switching unit, and the other end is connected to the exciting coils of the respective relays under test through at least one of the connectors;

[0021] A current source for outputting the current signal, one end of the current source is connected to the first switching unit, and the other end is connected to each sampling unit through the contact circuit of one of the relays under test through at least one of the connectors.

[0022] Preferably, the test signal supply unit includes:

[0023] A relay protection tester for outputting the adjustable voltage and the current signal, the relay protection tester is connected to the first switching unit, the second switching unit and the respective relays under test.

[0024] Preferably, the on-line batch calibration device for nuclear power plant relays further includes:

[0025] A housing for accommodating the battery unit, the processing unit, the first switching unit, the second switching unit, the plurality of connectors and the plurality of sampling units, and the relay protection tester is connected to each unit provided in the housing through the connector.

[0026] Preferably, the number of the sampling units is 20.

[0027] Preferably, the on-line batch calibration device for nuclear power plant relays further includes:

[0028] An upper computer for displaying the operating voltage, return voltage and contact closing resistance of the respective relays under test, and the upper computer is communicatively connected to the processing unit.

[0029] The technical solution of the present invention can calibrate relays in batch online, enabling the staff to no longer manually adjust the adjustable voltage, significantly improving the calibration efficiency and accuracy of on-line relays, and also reducing the risk of human error. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 1 is the circuit structure block diagram of the on-line batch calibration device for nuclear power plant relays in some embodiments of the present utility model;

[0032] Figure 2 is the circuit schematic diagram of the on-line batch calibration device for nuclear power plant relays in some embodiments of the present utility model;

[0033] Figure 3 is the circuit structure block diagram of the test signal supply unit in some embodiments of the present utility model;

[0034] Figure 4 is the structure diagram of the on-line batch calibration device for nuclear power plant relays in some embodiments of the present utility model. Detailed implementation manners

[0035] For a clearer understanding of the technical features, objectives and effects of the present utility model, the detailed implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings.

[0036] Figure 1 is the circuit structure block diagram of the on-line batch calibration device for nuclear power plant relays in some embodiments of the present utility model. This device can test the operating voltage, return voltage and contact closing resistance of multiple relays simultaneously without removing the relays (i.e., on-line relays), which can improve the efficiency of relay calibration and the test accuracy of operating voltage, return voltage and contact closing resistance. As Figure 1 shown, the on-line batch calibration device for nuclear power plant relays includes a test signal supply unit 2, a processing unit 4, a battery unit 5, a plurality of connectors 1 and a plurality of sampling units 3.

[0037] It should be noted that the return of a relay refers to the action that after the excitation coil of the relay is excited and the normally open contact is attracted to the fixed contact, the excitation coil loses magnetism due to the decrease of the input voltage, resulting in the disconnection of the normally open contact from the fixed contact.

[0038] The plurality of connectors 1 are used to connect a plurality of on-line relays to be tested. Specifically, since the actual installation environments of the on-line relays to be tested are various, to ensure that the connectors 1 can stably connect the excitation coil and the contact circuits (including the normally open contact circuit and the normally closed contact circuit) of the relays to be tested, the plurality of connectors 1 may include Kelvin clips, needle probes, hook probes, etc. To further improve the connection stability of the connectors 1, adhesive clay and tape can also be used to assist in fixing the connection between the connectors 1 and the relays to be tested.

[0039] The test signal supply unit 2 is used to output adjustable voltage and current signals to each relay under test and receive pulse signals. Specifically, the adjustable voltage output by the test signal supply unit 2 is a voltage signal that gradually increases to make the relay operate and gradually decreases after the relay operates to make the relay return. In addition, each time the test signal supply unit 2 receives a pulse signal, it will output a signal that can represent the adjustable voltage and a signal that can represent the current output voltage magnitude of the current source providing the current signal to the processing unit 4, and the current magnitude of the currently output adjustable voltage corresponds to the relay operating voltage or the relay return voltage corresponding to the relay that has just operated or returned. For example, when a certain relay operates, the test signal supply unit 2 will receive a pulse signal (provided by the processing unit). At this time, the magnitude of the adjustable voltage output by the test signal supply unit 2 corresponds to the relay operating voltage. When the normally open contact loop (composed of the normally open contact and the fixed contact of the relay) of the relay is disconnected due to the gradually decreasing adjustable voltage causing the relay to demagnetize, the magnitude of the adjustable voltage output by the test signal supply unit 2 after receiving a pulse signal corresponds to the relay return voltage.

[0040] Each sampling unit 3 is used to output a sampling signal based on the contact closing resistance of the corresponding relay under test. Each sampling unit 3, the contact loop of a relay under test, and the test signal supply unit 2 form a test loop through at least one connector 1. Specifically, referring to Figure 1 , each sampling unit 3 forms a test loop with the contact loop of each relay under test and the test signal supply unit 2 through several connectors 1. Each sampling unit 3 will output a sampling signal according to the voltage magnitude across the equivalent resistance in the corresponding test loop. Since the equivalent resistance of the sampling unit 3 in this loop and the loop voltage (equivalent to the current output voltage of the current source providing the current signal) are both known (the processing unit 4 can obtain the magnitudes of the loop voltage and current signal by communicating with the test signal supply unit 2), the contact closing resistance of the corresponding relay under test can be calculated according to Ohm's law based on the loop voltage, equivalent resistance, and sampling signal. Specifically, the contact closing resistance can be calculated by the following formula: RX = US / IS - RS, where RX represents the contact closing resistance, US represents the loop voltage, IS represents the current magnitude flowing through the equivalent resistance (since the sampling signal can represent the voltage magnitude across the equivalent resistance and the equivalent resistance is known, IS can be confirmed through the sampling signal and the equivalent resistance), and RS represents the equivalent resistance.

[0041] The processing unit 4 is configured to receive the loop voltage and current signals input by the test signal supply unit 2 into the test loop and the sampling signals output by each sampling unit 3, output pulse signals when the contacts of each relay under test are closed and turned off, and obtain the relay operating voltage, relay return voltage, and output contact closing resistance. The processing unit 4 is connected to the test signal supply unit 2 and multiple sampling units 3. Specifically, before the relay under test operates, its normally open contact circuit is open. Therefore, the voltage detected by the sampling unit 3 that forms a loop with the test normally open contact circuit tends to 0V (referred to as the no-voltage detection state). When the relay under test operates, the normally open contact circuit closes, and the corresponding sampling unit 3 will detect a voltage significantly greater than 0 (referred to as the voltage detection state). On the contrary, when the normally open contact circuit switches from closed to open, the sampling unit 3 will switch from the voltage detection state to the no-voltage detection state.

[0042] Understandably, based on the above mechanism, the processing unit 4 can determine the operation time and return time of each relay under test by monitoring the change of the sampling signals output by the sampling unit 3, so as to output a pulse signal to the test signal supply unit at the operation time and return time. Taking a certain relay under test as an example, when the processing unit 4 detects a rising edge or a falling edge of the sampling signal output by the sampling unit 3 connected to the relay under test, it obtains the magnitude of the adjustable voltage output by the test signal supply unit at the corresponding time, so as to obtain the relay operating voltage or relay return voltage. In addition, for the normally closed contact circuit, whether the relay under test operates or not can also cause the sampling signal output by the connected sampling unit 3 to have a rising edge or a falling edge. Based on this, the relay operating voltage or relay return voltage can also be determined.

[0043] The battery unit 5 is used to supply power to the processing unit 4 and each sampling unit 3. The battery unit 5 is connected to the processing unit 4 and each sampling unit 3.

[0044] In this embodiment, the staff can connect multiple relays under test online through the connector 1 at the same time, and then input adjustable voltage and current signals for testing to each relay under test through the test signal supply unit 2, and test the operating voltage, return voltage, and sampling signals of each relay under test. Then, the processing unit 4 can calculate the contact closing resistance of each relay under test according to Ohm's law based on the current signal, the equivalent resistance of each sampling unit 3 on the test loop, and the output sampling signal, achieving the technical effect of online batch verification of relays. Moreover, the process of increasing and decreasing the adjustable voltage can be realized through existing algorithms, simplifying the verification work flow of online relays, significantly improving the verification efficiency and accuracy of online relays, and reducing the risk of human error.

[0045] In some embodiments, such as Figure 2As shown, each sampling unit 3 may include a current sensing amplifier U1, a sampling resistor, a second resistor R2, and a first capacitor C1. The positive terminal of the current sensing amplifier U1 is connected to the first current signal output terminal of the test signal supply unit 2, and the negative terminal is connected to the second current signal output terminal of the test signal supply unit 2 through the contact loop of a relay under test via at least one connector 1. The positive terminal of the current sensing amplifier U1 is also connected to the negative terminal of the current sensing amplifier U1 through the sampling resistor. The output terminal of the current sensing amplifier U1 is connected to the processing unit 4 through the second resistor R2, and the connection node between the second resistor R2 and the processing unit 4 is grounded through the first capacitor C1.

[0046] In this embodiment, the current sensing amplifier U1 may be a current sensing amplifier of model I NA193. The current sensing amplifier U1 can measure the voltage across the sampling resistor and output a sampling signal that can represent the magnitude of this voltage. Since the positive and negative terminals of the current sensing amplifier U1 are in a high-impedance state, the resistance value of the sampling resistor can be regarded as the equivalent resistance of the sampling unit 3 in the test loop. Further, the parameters of the sampling resistor can be adjusted according to the curve to adjust the magnitude of the equivalent resistance. Additionally, the sampling resistor may be composed of a parallel connection of a resistor RS1 and a resistor RS2.

[0047] In some embodiments, as Figure 2 and Figure 3 shown, the on-line batch calibration device for nuclear power plant relays may further include a first switch unit 6 and a second switch unit 7.

[0048] Among them, the control terminal of the first switch unit 6 is connected to the processing unit 4 to make its switch loop conduct or turn off according to the control signal output by the processing unit 4. One end of the switch loop of the first switch unit 6 is simultaneously connected to the positive terminals of each current sensing amplifier U1, and the other end is connected to the first current signal output terminal of the test signal supply unit 2. When performing relay calibration, the processing unit 4 will only control the switch loop of the first switch unit 6 to conduct, and when not performing calibration, control its switch loop to turn off, so as to avoid the long-term energization of some normally closed contacts of the relay under test during non-calibration periods, causing unnecessary losses to the relay under test.

[0049] The control terminal of the second switch unit 7 is connected to the processing unit 4 to make its switch loop conduct or turn off according to the control signal output by the processing unit 4. One end of the switch loop of the second switch unit 7 is connected to the adjustable voltage output terminal of the test signal supply unit 2, and the other end is connected to the excitation coils of each relay under test one-to-one via a plurality of connectors 1. When performing relay calibration, the processing unit 4 will only control the switch loop of the second switch unit 7 to conduct, and when not performing calibration, control the switch loop to turn off, so as to avoid the long-term energization of the excitation coils of the relay under test during non-calibration periods, causing unnecessary losses to the relay under test.

[0050] In some embodiments, as Figure 2 shown, the first switch unit 6 and the second switch unit 7 respectively include a relay K1, a diode D2, a first switching transistor Q1, a first resistor R1, and a fifth resistor R5. Specifically, one end of the normally open loop of the relay K1 included in the first switch unit 6 is simultaneously connected to the positive ends of the current sensing amplifiers U1, and the other end is connected to the first current signal output end of the test signal supply unit 2. One end of the normally open loop of the relay K1 included in the second switch unit 7 is connected to the adjustable voltage output end of the test signal supply unit 2, and the other end is connected to the excitation coils of the relays under test one-to-one through a plurality of connectors 1. One end of the excitation coil of the relay K1 is connected to the first DC power supply and the cathode of the diode D2, and the other end is connected to the anode of the diode D2 and the input pole of the first switching transistor Q1. The output end of the first switching transistor Q1 is grounded, and the control end of the first switching transistor Q1 is connected to the processing unit 4 through the first resistor R1 and grounded through the fifth resistor R5.

[0051] In this embodiment, when the processing unit 4 needs to control the first switch unit 6 or the second switch unit 7 to conduct, the first switching transistor Q1 can be made to conduct by outputting a control signal, so that the relay K1 is excited, thereby making its normally open loop conduct. Conversely, when it is necessary to turn off the first switch unit 6 or the second switch unit 7, the processing unit 4 can control the first switching transistor Q1 to turn off.

[0052] Optionally, the first switching transistor Q1 is an NPN triode, and the control end, input end, and output end of the first switching transistor Q1 respectively correspond to the base, collector, and emitter of the NPN triode.

[0053] In some embodiments, as Figure 3 shown, the test signal supply unit 2 may include an adjustable power supply and a current source.

[0054] The adjustable power supply is used to output an adjustable voltage. One end of the adjustable power supply is used as the adjustable voltage output end of the test signal supply unit 2 and is connected to the second switch unit 7, and the other end is connected to the excitation coils of the relays under test through at least one connector 1. Among them, the adjustable power supply can be an existing controllable power supply module as long as it can output an adjustable voltage signal to drive the excitation coils of the relays under test.

[0055] The current source is used to output a current signal. One end of the current source is used as the first current signal output end of the test signal supply unit 2 and is connected to the first switch unit 6, and the other end is used as the second current signal output end of the test signal supply unit 2 and is connected to each sampling unit 3 through at least one connector 1 and through the contact loop of a relay under test. Among them, the current source can be an existing current source module or circuit as long as it can output a stable current signal.

[0056] In some embodiments, such as Figure 3 shown, the battery unit is also used to supply power to the first switch unit 6 and the second switch unit 7, and the battery unit is also connected to the first switch unit 6 and the second switch unit 7. Among them, the battery unit can be composed of different types of batteries such as storage batteries or lithium batteries, and can output a stable DC power supply, such as a first DC power supply (+12V, used to supply power to the relay K1), a second DC power supply (+3.3V, used to supply power to the processing unit 4), and a third DC power supply (+5V, used to supply power to the current sensing amplifier U1).

[0057] In another embodiment, such as Figure 4 shown, the test signal supply unit 2 may include a relay protection tester 21.

[0058] The relay protection tester 21 is used to output adjustable voltage and current signals, and the relay protection tester 21 is connected to the first switch unit 6, the second switch unit 7, and each relay under test. Among them, the relay protection tester 21 can be an existing relay protection tester. Although the relay protection tester 21 is large in size and not convenient to carry, it is an equipment already equipped in the nuclear power plant, which can reduce the manufacturing cost of this device, and can provide very accurate adjustable voltage and current signals, which helps to improve the calibration accuracy.

[0059] In some embodiments, such as Figure 4 shown, the on-line batch calibration device for nuclear power plant relays further includes a housing 8. The housing 8 is used to accommodate the battery unit 5, the processing unit 4, the first switch unit 6, the second switch unit 7, a plurality of connectors 1, and a plurality of sampling units 3. The relay protection tester 21 is connected to each unit (including the relay under test, the first switch unit 6, and the second switch unit 7) provided in the housing 8 through the connector 1. Since the relay protection tester 21 is large in size, and the relay protection tester 21 is also commonly used in other calibration work in the nuclear power plant, and in this embodiment, the relay protection tester 21 is connected in an external connection manner through the connector 1. On the one hand, it is convenient for the staff to allocate the unused relay protection tester 21 in the nuclear power plant to carry out batch calibration work. Not only is it convenient to disassemble and assemble the relay protection tester 21, but also the cost can be saved (because there is no need to re-develop the current source and adjustable power supply).

[0060] In some embodiments, the number of the sampling units 3 can be 20. Of course, the number of the sampling units 3 can also be set according to actual needs.

[0061] In some embodiments, such as Figure 4As shown, the on-line batch verification device for the nuclear power plant relay further includes a host computer 9. The host computer 9 is used to display the operating voltage, return voltage, and contact closing resistance of each relay under test. The host computer 9 is communicatively connected to the processing unit 4. Among them, the host computer 9 includes but is not limited to terminal devices such as laptop computers, PCs, and tablet computers. The host computer 9 can display parameters such as the operating voltage, return voltage, and contact closing resistance of multiple relays under test in the form of a table.

[0062] It can be understood that the above embodiments only express the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. An on-line batch verification device for nuclear power plant relays, characterized in that, Comprising: A plurality of connectors (1) for connecting a plurality of relays under test that are online; A test signal supply unit (2) for outputting adjustable voltage and current signals to each of the relays under test and receiving pulse signals; A plurality of sampling units (3) for outputting sampling signals based on the contact closing resistance of the corresponding relays under test. Each of the sampling units (3), the contact loop of a relay under test, and the test signal supply unit (2) form a test loop through at least one of the connectors (1); A processing unit (4) for receiving the loop voltage input by the test signal supply unit (2) into the test loop and the sampling signals output by each of the sampling units (3), outputting the pulse signals when the contacts of each of the relays under test are closed and turned off to obtain the relay operating voltage and the relay return voltage, and outputting the contact closing resistance. The processing unit (4) is connected to the test signal supply unit (2) and the plurality of sampling units (3); and A battery unit (5) for supplying power to the processing unit (4) and each of the sampling units (3).

2. The on-line batch verification device for nuclear power plant relays according to claim 1, characterized in that Each of the sampling units (3) includes a current sensing amplifier U1, a sampling resistor, a second resistor R2, and a first capacitor C1; The positive terminal of the current sensing amplifier U1 is connected to the first current signal output terminal of the test signal supply unit (2), the negative terminal is connected to the second current signal output terminal of the test signal supply unit (2) through the contact loop of a relay under test via at least one of the connectors (1). The positive terminal of the current sensing amplifier U1 is also connected to the negative terminal of the current sensing amplifier U1 through the sampling resistor. The output terminal of the current sensing amplifier U1 is connected to the processing unit (4) through the second resistor R2. The connection node between the second resistor R2 and the processing unit (4) is grounded through the first capacitor C1.

3. The on-line batch verification device for nuclear power plant relays according to claim 2, wherein, The current sensing amplifier U1 is a current sensing amplifier with the model INA193.

4. The on-line batch calibration device for nuclear power plant relays according to claim 2, wherein, Further comprising: A first switch unit (6), the control terminal of the first switch unit (6) is connected to the processing unit (4), one end of the switch loop of the first switch unit (6) is simultaneously connected to the positive terminals of each of the current sensing amplifiers U1, and the other end is connected to the first current signal output terminal of the test signal supply unit (2); and A second switch unit (7), the control terminal of the second switch unit (7) is connected to the processing unit (4), one end of the switch loop of the second switch unit (7) is connected to the adjustable voltage output terminal of the test signal supply unit (2), and the other end is connected to the excitation coils of each of the relays under test one-to-one via a plurality of the connectors (1).

5. The on-line batch calibration device for nuclear power plant relays according to claim 4, characterized in that, The first switch unit (6) and the second switch unit (7) each include a relay K1, a diode D2, a first switching transistor Q1, a first resistor R1, and a fifth resistor R5; One end of the normally open loop of the relay K1 included in the first switch unit (6) is simultaneously connected to the positive terminals of the current sensing amplifiers U1, and the other end is connected to the first current signal output terminal of the test signal supply unit (2). One end of the normally open loop of the relay K1 included in the second switch unit (7) is connected to the adjustable voltage output terminal of the test signal supply unit (2), and the other end is connected to the excitation coils of the relays under test one-to-one through the plurality of connectors (1). One end of the excitation coil of the relay K1 is connected to the first DC power supply and the cathode of the diode D2, and the other end is connected to the anode of the diode D2 and the input pole of the first switching transistor Q1. The output terminal of the first switching transistor Q1 is grounded, and the control terminal of the first switching transistor Q1 is connected to the processing unit (4) through the first resistor R1 and grounded through the fifth resistor R5.

6. The on-line batch calibration device for nuclear power plant relays according to claim 4, characterized in that, The test signal supply unit (2) includes: An adjustable power supply for outputting the adjustable voltage, one end of the adjustable power supply is connected to the second switch unit (7), and the other end is connected to the excitation coils of the relays under test through at least one of the connectors (1); and A current source for outputting the current signal, one end of the current source is connected to the first switch unit (6), and the other end is connected to each of the sampling units (3) through the contact loop of a relay under test through at least one of the connectors (1).

7. The on-line batch calibration device for nuclear power plant relays according to claim 4, characterized in that, The test signal supply unit (2) includes: A relay protection tester (21) for outputting the adjustable voltage and the current signal, the relay protection tester (21) is connected to the first switch unit (6), the second switch unit (7) and the relays under test.

8. The on-line batch calibration device for nuclear power plant relays according to claim 7, wherein, Further included is: A housing (8) for accommodating the battery unit (5), the processing unit (4), the first switch unit (6), the second switch unit (7), the plurality of connectors (1) and the plurality of sampling units (3). The relay protection tester (21) is connected to each unit provided in the housing (8) through the connector (1).

9. The on-line batch calibration device for nuclear power plant relays according to claim 1, characterized in that, The number of the sampling units (3) is 20.

10. The on-line batch verification device for nuclear power plant relays according to any one of claims 1 to 9, characterized in that, Further included is: An upper computer (9) for displaying the operating voltage, return voltage and contact closing resistance of the relays under test. The upper computer (9) is communicatively connected to the processing unit (4).

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