Total station secondary equipment test system

Abstract

The invention discloses a whole-station secondary equipment test system. The whole-station secondary equipment test system comprises an analog quantity output module, a control module, a protection module, a switching module and an output interface, the analog quantity output module is used for outputting analog quantity; the output ends of the plurality of switching modules are electrically connected with the plurality of output interfaces in a one-to-one correspondence manner, the output interfaces are used for connecting to-be-tested secondary equipment, and the plurality of switching modules are used for controlling analog quantity to be switched and output at the plurality of output interfaces; the control module is used for acquiring to-be-tested equipment information, and controlling the switching module corresponding to the output interface connected with the to-be-tested secondary equipment to be in an output state based on the to-be-tested equipment information; the protection module is used for allowing the analog quantity to pass when the analog quantity type is consistent with the preset type. Through adoption of the scheme, the problems of low test efficiency, low accuracy and low reliability are solved, and the test requirements in a complex scene of overall closed-loop test of the secondary equipment of the whole station can be met.

Description

Technical Field

[0001] The invention relates to the technical field of power grids, and in particular to a full-station secondary equipment testing system. Background Art

[0002] With the rapid development of power equipment and the continuous improvement of the level of intelligence, the commissioning of substation secondary equipment has become more and more important. The traditional test method of testing substation secondary equipment after installation has certain omissions in the integrity and standardization of the test. A factory-based automatic testing method is needed to conduct a closed-loop test of the secondary equipment throughout the station.

[0003] In order to realize the factory automatic testing of substation secondary equipment, the input of analog signals is the key link in testing and verifying the performance of equipment. In the current field of power device testing, mainstream analog output devices are usually faced with the limitation of the number of output sources. When performing automatic detection of the overall closed-loop test of the secondary equipment of a multi-bay and multi-circuit substation, if the number of intervals to be tested exceeds the number of output sources of the tester, technicians are required to manually replace the test cables to the corresponding intervals frequently. This process is not only time-consuming and labor-intensive, but also requires the operator to have an in-depth understanding of the relay protection device so that the replacement of the test line can be completed quickly and accurately according to the line replacement instruction document. This test method that relies on manual operation is not only inefficient, but also prone to human errors, affecting the accuracy and reliability of the test. Summary of the invention

[0004] The present invention provides a whole-station secondary equipment testing system to solve the problems of low testing efficiency, low accuracy and low reliability.

[0005] According to one aspect of the present invention, a whole-station secondary equipment test system is provided, the whole-station secondary equipment test system comprising an analog output module, a control module, a protection module, a switching module and an output interface;

[0006] The analog quantity output module is electrically connected to the control module and is used for outputting analog quantity;

[0007] The number of the switching modules is multiple, the number of the output interfaces is the same as that of the switching modules, the input ends of the multiple switching modules are electrically connected to the protection modules, the output ends of the multiple switching modules are electrically connected to the multiple output interfaces in a one-to-one correspondence, the output interfaces are used to connect to the secondary equipment to be tested, and the multiple switching modules are used to control the analog quantity to switch output at the multiple output interfaces;

[0008] Multiple switching modules and the protection module are electrically connected to the output end of the control module. The control module is used to obtain information about the device under test, and based on the information about the device under test, control the switching module corresponding to the output interface to which the secondary device under test is connected to be in an output state, and determine the preset type based on the information about the device under test; the protection module is used to check whether the analog quantity type is consistent with the preset type, and allow the analog quantity to pass when the analog quantity type is consistent with the preset type.

[0009] In an optional embodiment of the present invention, the protection module includes an AC protection circuit and a DC protection circuit, wherein the AC protection circuit is used to allow the analog quantity to pass when the analog quantity type is AC, and to block the analog quantity from passing when the analog quantity type is not AC;

[0010] The DC protection circuit is used to allow the analog quantity to pass when the analog quantity type is DC, and to block the analog quantity from passing when the analog quantity type is not DC.

[0011] In an optional embodiment of the present invention, the AC protection circuit includes a capacitor;

[0012] And / or, the DC protection circuit includes an inductor.

[0013] In an optional embodiment of the present invention, the protection module further includes a current detection component and a voltage detection component, wherein the current detection component is used to detect the current amplitude output by the output interface in the output state, and the voltage detection component is used to detect the voltage amplitude output by the output interface in the output state;

[0014] The control module is electrically connected to both the current detection element and the voltage detection element. The control module is used to obtain the current amplitude and the voltage amplitude, and when the voltage amplitude exceeds a preset voltage range or the current amplitude exceeds a preset current range, control the switching module corresponding to the output interface in the output state to disconnect so that the output interface stops outputting.

[0015] In an optional embodiment of the present invention, the voltage detection element includes a voltage transformer;

[0016] And / or, the current detection component includes a current transformer.

[0017] In an optional embodiment of the present invention, an indication module is further included, and the number of the indication modules is the same as the number of the output interfaces, and the control module is specifically used for:

[0018] When the voltage amplitude exceeds a preset voltage range or the current amplitude exceeds a preset current range, the indication module corresponding to the output interface in the output state is controlled to send indication information.

[0019] In an optional embodiment of the present invention, the indication module includes an indicator light.

[0020] In an optional embodiment of the present invention, the switching module includes a relay.

[0021] In an optional embodiment of the present invention, the control module is specifically used for:

[0022] Obtaining a switching control signal;

[0023] Acquire a time calibration signal;

[0024] Based on the switching control signal and the time calibration signal, the plurality of switching modules are controlled in a timing sequence to switch different output interfaces to an output state.

[0025] In an optional embodiment of the present invention, the control module includes an industrial computer, a control circuit and a controller;

[0026] The industrial computer is electrically connected to the control circuit, and the industrial computer is used to obtain the switching control signal, and convert the switching control signal into a logic signal and send it to the control circuit;

[0027] The control circuit is electrically connected to the controller, and the control circuit is used to receive the time calibration signal and send the logic signal to the controller;

[0028] The controller is electrically connected to the plurality of switching modules through the protection module, and is used for controlling the plurality of switching modules to switch different output interfaces to an output state in a timing sequence based on the switching control signal which is the logic signal and the time calibration signal.

[0029] The technical solution of the embodiment of the present invention is to set an analog output module, a control module, a protection module, a switching module and an output interface, connect multiple different secondary devices through multiple output interfaces, and the analog output module outputs analog quantity, and controls the switching module corresponding to the output interface connected to the secondary device to be tested to be in output state, that is, multiple switching modules switch analog quantities to be output by the output port connected to the secondary device to be tested, and then the control module obtains the device information of the output interface in the output state, and determines the preset type based on the information of the device to be tested; the protection module checks whether the analog quantity type is consistent with the preset type, and allows the analog quantity to pass when the analog quantity type is consistent with the preset type, so that the analog quantity is output from the output interface to the secondary device to be tested through the switching module in the output state. When it is necessary to test another secondary device, it is only necessary to control the switching module to switch the analog quantity to be output by another output interface, so as to realize the test of another secondary device. That is, it is realized that an input analog quantity can be flexibly switched to different output interfaces to be output to different secondary devices. Compared with the related technology that requires technicians to manually replace the test cable when switching the secondary equipment to be tested, this solution can automatically switch to test different secondary equipment to be tested, which can improve the test efficiency, greatly improve the flexibility and efficiency of the test, and reduce the labor cost and error rate in the debugging process. It solves the problems of low test efficiency, low accuracy and low reliability, and can meet the testing needs in complex scenarios of overall closed-loop testing of the secondary equipment of the entire station.

[0030] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A connection block diagram of a whole-station secondary equipment test system provided by an embodiment of the present invention;

[0033] Figure 2 yes Figure 1 The circuit diagram of the connection between the control module and the protection module;

[0034] Figure 3 It is a connection block diagram of a protection module, an interval output port, a switching module and an output interface provided by an embodiment of the present invention;

[0035] Figure 4 It is a circuit schematic diagram of a partition output port, a switching module and an output interface provided by an embodiment of the present invention;

[0036] Figure 5 yes Figure 1 Connection block diagram of analog output module, control module and protection module.

[0037] Among them: 1. Analog output module; 2. Control module; 21. Industrial computer; 22. Control circuit; 23. Controller; 3. Protection module; 31. AC protection circuit; 32. DC protection circuit; 33. Current detection element; 34. Voltage detection element; 4. Switching module; 41. Relay; 5. Output interface; 51. Voltage interface; 52. Current interface; 6. Indication module; 7. Interval output port; 71. Voltage output port; 72. Current output port. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Figure 1 This is a connection block diagram of a whole-station secondary equipment test system provided by an embodiment of the present invention. This embodiment can be applied to the situation of testing the secondary equipment of a substation, such as Figure 1 As shown, the whole-station secondary equipment test system includes an analog output module 1 , a control module 2 , a protection module 3 , a switching module 4 and an output interface 5 .

[0041] The analog output module 1 is electrically connected to the control module 2 and is used to output analog quantities; wherein the analog output module 1 refers to a module capable of outputting analog quantities, and the analog quantity may specifically be one or more of analog voltage and analog current. In some embodiments, the analog output module 1 includes an intelligent test terminal, and analog quantities such as analog voltage and analog current are output through the intelligent test terminal. Preferably, the intelligent test terminal includes a secondary test device for an intelligent substation, and the secondary test device for an intelligent substation has multiple interfaces such as analog voltage and current output, an MMS interface, and a 100M / 1000M optical Ethernet interface, and supports multiple functions such as analog voltage and current output, SV / GOOSE message test, and protection function test of an intelligent substation. Therefore, by allowing the intelligent test terminal to include a secondary test device for an intelligent substation, analog quantities such as analog voltage and analog current can be easily output. It is understandable that in other embodiments, the analog output module 1 may also include other modules capable of outputting analog quantities, which are not specifically limited here, but are only used as examples.

[0042] There are multiple switching modules 4, and the number of output interfaces 5 is the same as that of the switching modules 4. The input ends of the multiple switching modules 4 are electrically connected to the protection module 3, and the output ends of the multiple switching modules 4 are electrically connected to the multiple output interfaces 5 in a one-to-one correspondence. The output interfaces 5 are used to connect the secondary device to be tested, and the multiple switching modules 4 are used to control the analog quantity to switch output at the multiple output interfaces 5. The switching module 4 refers to a module in the circuit that can realize the analog quantity switching output at multiple different output interfaces 5. When the switching module 4 connected to the output interface 5 is turned on, the analog quantity can be output to the secondary device to be tested through the output interface 5. When the switching module 4 connected to the output interface 5 is turned off, the analog quantity cannot be output to the secondary device to be tested through the output interface 5. Therefore, by controlling the multiple switching modules 4 to be in different states, the analog quantity can be switched and output at multiple output interfaces 5. Therefore, in the case of only one input analog quantity, it can be switched and output to different secondary devices connected to the multiple output interfaces 5 through multiple switching modules 4, so as to realize the testing of different secondary devices.

[0043] Multiple switching modules 4 and protection modules 3 are electrically connected to the output end of the control module 2. The control module 2 is used to obtain information about the device under test, and based on the information about the device under test, control the switching module 4 corresponding to the output interface 5 connected to the secondary device under test to be in an output state, and determine the preset type based on the information of the device under test; the protection module 3 is used to check whether the analog quantity type is consistent with the preset type, and allow the analog quantity to pass when the analog quantity type is consistent with the preset type.

[0044] Among them, the device information to be tested refers to the information of the secondary device that needs to be tested this time, and the switching module 4 is in the output state, which means that the analog quantity of the line where the switching module 4 is located can be output to the corresponding output interface 5 through the switching module 4. The analog quantity type refers to the type of analog quantity passing through the protection module 3. In some embodiments, the analog quantity type includes AC and DC. The preset type refers to the type of analog quantity that should be output from the output interface 5 that is preset in advance. Different secondary devices require different types of analog quantities, so the preset type can be obtained through the device information to be tested. For example, when the secondary device to be tested connected to the output interface 5 needs to input AC voltage, the preset type is AC voltage at this time. When the actual analog quantity type is AC voltage, the analog quantity is allowed to be output from the output interface 5 to the secondary device to be tested through the protection module 3. When the actual analog quantity type is DC voltage, the analog quantity is not allowed to be output from the output interface 5 to the secondary device to be tested through the protection module 3.

[0045] The above scheme, by setting up analog output module 1, control module 2, protection module 3, switching module 4 and output interface 5, connects multiple different secondary devices through multiple output interfaces 5, analog output module 1 outputs analog quantity, controls the switching module 4 corresponding to the output interface 5 connected to the secondary device to be tested to be in output state, that is, multiple switching modules 4 switch analog quantity to be output by the output port connected to the secondary device to be tested, and then the control module 2 obtains the device information of the output interface 5 in the output state, and determines the preset type based on the device information to be tested; the protection module 3 checks whether the analog quantity type is consistent with the preset type, and allows the analog quantity to pass when the analog quantity type is consistent with the preset type, so that the analog quantity is output from the output interface 5 to the secondary device to be tested through the switching module 4 in the output state. When it is necessary to test another secondary device, it is only necessary to control the switching module 4 to switch the analog quantity to be output by another output interface 5, so as to realize the test of another secondary device. That is, it is realized that an input analog quantity can be flexibly switched to different output interfaces 5 to be output to different secondary devices. Compared with the related technology that requires technicians to manually replace the test cable when switching the secondary equipment to be tested, this solution can automatically switch to test different secondary equipment to be tested, which can improve the test efficiency, greatly improve the flexibility and efficiency of the test, and reduce the labor cost and error rate in the debugging process. It solves the problems of low test efficiency, low accuracy and low reliability, and can meet the testing needs in complex scenarios of overall closed-loop testing of the secondary equipment of the entire station.

[0046] In an optional embodiment of the present invention, Figure 2As shown, the protection module 3 includes an AC protection circuit 31, which is used to allow the analog quantity to pass when the analog quantity type is AC, and block the analog quantity from passing when the analog quantity type is not AC; preferably, the AC protection circuit 31 includes a capacitor, which has the characteristics of blocking the passage of direct current and allowing the passage of alternating current, so it can only allow the analog quantity of alternating current to pass, and block the passage of the analog quantity when the analog quantity is not AC.

[0047] In an optional embodiment of the present invention, the protection module 3 includes a DC protection circuit 32, which is used to allow the analog quantity to pass when the analog quantity type is DC, and block the analog quantity from passing when the analog quantity type is not DC. Preferably, the DC protection circuit 32 includes an inductor. The inductor has the characteristics of blocking the passage of AC power and allowing the passage of DC power, so it can only allow the analog quantity of DC power to pass, and block the passage of the analog quantity when the analog quantity is not DC.

[0048] In an optional embodiment of the present invention, Figure 2 As shown, the protection module 3 also includes a current detection component 33 and a voltage detection component 34. The current detection component 33 is used to detect the current amplitude output by the output interface 5 in the output state, and the voltage detection component 34 is used to detect the voltage amplitude output by the output interface 5 in the output state. Among them, the current detection component 33 refers to a component that can detect the current amplitude. Preferably, the current detection component 33 includes a current transformer, so that the current amplitude of the line where the protection module 3 is located can be easily detected. The voltage detection component 34 refers to a component that can detect the voltage amplitude. Preferably, the voltage detection component 34 includes a voltage transformer, so that the voltage amplitude of the line where the protection module 3 is located can be easily detected.

[0049] The control module 2 is electrically connected to both the current detection element 33 and the voltage detection element 34. The control module 2 is used to obtain the current amplitude and the voltage amplitude, and when the voltage amplitude exceeds the preset voltage range or the current amplitude exceeds the preset current range, the switching module 4 corresponding to the output interface 5 in the output state is controlled to be disconnected, so that the output interface 5 stops outputting. Preferably, the control module 2 is used to: determine the preset voltage range and the preset current range based on the information of the device to be tested. The preset voltage range refers to the preset range that the voltage of the secondary device connected to the output interface 5 does not exceed, and the preset current range refers to the preset range that the current of the secondary device connected to the output interface 5 does not exceed. When the switching module 4 corresponding to the output interface 5 in the output state is disconnected, the analog quantity is no longer output by the output interface 5, which can prevent the damage to the secondary device caused by excessive voltage amplitude and excessive current amplitude, prevent the secondary device from being damaged during the test, and improve the life of the secondary device.

[0050] In an optional embodiment of the present invention, Figure 1 and Figure 2 As shown, the whole-station secondary equipment test system also includes an indication module 6, and the number of the indication modules 6 is the same as that of the output interfaces 5, and they correspond one to one. The control module 2 is specifically used for: when the voltage amplitude exceeds the preset voltage range or the current amplitude exceeds the preset current range, the indication module 6 corresponding to the output interface 5 in the output state is controlled to send out an indication message. Among them, the indication information refers to information used to convey that the analog quantity exceeds the preset voltage range or exceeds the preset current range, and there is a safety hazard. Preferably, the indication module 6 includes an indicator light. The indicator light sends out the indication information by emitting light. Different output interfaces 5 correspond to different indicator lights. When the voltage amplitude of the analog quantity output by a certain output interface 5 exceeds the preset voltage range or the current amplitude exceeds the preset current range, the indicator light corresponding to the output interface 5 is controlled to emit light, so that the staff can see through the indicator light which output interface 5 has a fault in the line.

[0051] In an optional embodiment of the present invention, Figure 3 and Figure 4 As shown, the switching module 4 includes a relay 41. The working principle of the relay 41 is mainly to use physical principles such as electromagnetic induction or thermal effect to control the on and off of the circuit 22. When the relay 41 is turned off, the line where the relay 41 is located is disconnected, so that the analog quantity cannot be output through the output interface 5 corresponding to the line route where the relay 41 is located. When the relay 41 is closed, the line where the relay 41 is located is connected, and the analog quantity can be output through the output interface 5 corresponding to the line route where the relay 41 is located.

[0052] In an optional embodiment of the present invention, the whole-station secondary equipment test system further includes interval output ports 7, the number of interval output ports 7 is the same as the number of switching modules 4, and the protection module 3 is electrically connected to the switching module 4 in a one-to-one correspondence through the interval output ports 7. In some embodiments, the interval output ports 7 include a current output port 72 and a voltage output port 71.

[0053] In some embodiments, the output interface 5 includes a plurality of output channels, and the number of relays 41 included in each switching module 4 is correspondingly multiple. In a specific embodiment, the plurality of output channels is 24, including 2 A-phase current channels, B-phase current channels, C-phase current channels, zero-sequence current channels and 4 current common channels, and 2 A-phase voltage channels, B-phase voltage channels, C-phase voltage channels, zero-sequence voltage channels and 4 voltage common channels, and the number of relays 41 is 8, and each relay 41 controls the shutoff and conduction of 3 output channels. It is understandable that in other embodiments, the number of relays 41 is 24, and each relay 41 controls the shutoff and conduction of an output channel. In some embodiments, the output interface 5 includes a voltage interface 51 and a current interface 52, 2 A-phase voltage channels, B-phase voltage channels, C-phase voltage channels, and zero-sequence voltage channels are integrated in the voltage interface 51, 2 A-phase current channels, B-phase current channels, C-phase current channels, and zero-sequence current channels are integrated in the current interface 52, and multiple voltage interfaces 51 and current interfaces 52 are electrically connected to secondary devices via a hub. In some embodiments, the voltage interface 51 and the current interface 52 may be aviation sockets.

[0054] In an optional embodiment of the present invention, Figure 1 and Figure 5 As shown, the control module 2 is specifically used for: obtaining a switching control signal; obtaining a time calibration signal; and controlling multiple switching modules 4 to switch different output interfaces 5 to an output state in a timing sequence based on the switching control signal and the time calibration signal. Among them, the switching control signal refers to a signal instructing the control module 2 to switch the output interface 5 of the analog output, and the time calibration signal refers to a signal sent by a reliable time source for time synchronization and calibration of computers, networks, instruments and equipment, etc. The multiple secondary devices connected to the multiple output interfaces 5 usually have a fixed test sequence. By calibrating the time of the control module 2 through the time calibration signal, it can be ensured that the control module 2 controls the multiple switching modules 4 to switch different output interfaces 5 to an output state in a timing sequence according to the switching control signal, so that the multiple secondary devices connected to the multiple output interfaces 5 are tested in sequence in a timing sequence.

[0055] In an optional embodiment of the present invention, Figure 1 and Figure 5 As shown, the control module 2 includes an industrial personal computer 21, a control circuit 22 and a controller 23; the industrial personal computer 21 is electrically connected to the control circuit 22, and the industrial personal computer 21 is used to obtain a switching control signal and convert the switching control signal into a logic signal and send it to the control circuit 22; wherein, the industrial personal computer 21 (Industrial Personal Computer, IPC), that is, an industrial control computer, is a computer device designed specifically for industrial environments and production processes.

[0056] The control circuit 22 is electrically connected to the controller 23, and the control circuit 22 is used to receive the time calibration signal and send the logic signal to the controller 23. The controller 23 is electrically connected to the multiple switching modules 4 through the protection module 3, and the controller 23 is used to control the multiple switching modules 4 to switch different output interfaces 5 to the output state according to the timing based on the switching control signal which is the logic signal and the time calibration signal. In some embodiments, the controller 23 includes an FPGA, and in this case, the control circuit 22 is specifically a control circuit 22 that drives the FPGA. It can be understood that in other embodiments, the controller 23 can also be an MCU, which is not specifically limited here, but is just an example.

[0057] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0058] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A full-station secondary equipment testing system, characterized in that: It includes analog output module, control module, protection module, switching module and output interface; The analog quantity output module is electrically connected to the control module and is used for outputting analog quantity; The number of the switching modules is multiple, the number of the output interfaces is the same as that of the switching modules, the input ends of the multiple switching modules are electrically connected to the protection modules, the output ends of the multiple switching modules are electrically connected to the multiple output interfaces in a one-to-one correspondence, the output interfaces are used to connect to the secondary equipment to be tested, and the multiple switching modules are used to control the analog quantity to switch output at the multiple output interfaces; Multiple switching modules and the protection module are electrically connected to the output end of the control module, and the control module is used to obtain the information of the device under test, control the switching module corresponding to the output interface connected to the secondary device under test to be in an output state based on the information of the device under test, and determine the preset type based on the information of the device under test; The protection module is used to check whether the analog quantity type is consistent with the preset type, and allow the analog quantity to pass when the analog quantity type is consistent with the preset type.

2. The whole-station secondary equipment testing system according to claim 1, characterized in that: The protection module includes an AC protection circuit and a DC protection circuit, wherein the AC protection circuit is used to allow the analog quantity to pass when the analog quantity type is AC, and to block the analog quantity from passing when the analog quantity type is not AC; The DC protection circuit is used to allow the analog quantity to pass when the analog quantity type is DC, and to block the analog quantity from passing when the analog quantity type is not DC.

3. The whole-station secondary equipment testing system according to claim 2, characterized in that: The AC protection circuit includes a capacitor; And / or, the DC protection circuit includes an inductor.

4. The whole-station secondary equipment testing system according to any one of claims 1 to 3, characterized in that: The protection module further includes a current detection component and a voltage detection component, wherein the current detection component is used to detect the current amplitude output by the output interface in the output state, and the voltage detection component is used to detect the voltage amplitude output by the output interface in the output state; The control module is electrically connected to both the current detection element and the voltage detection element. The control module is used to obtain the current amplitude and the voltage amplitude, and when the voltage amplitude exceeds a preset voltage range or the current amplitude exceeds a preset current range, control the switching module corresponding to the output interface in the output state to disconnect so that the output interface stops outputting.

5. The whole-station secondary equipment testing system according to claim 4, characterized in that: The voltage detection component includes a voltage transformer; And / or, the current detection component includes a current transformer.

6. The whole-station secondary equipment testing system according to claim 4, characterized in that: It also includes an indication module, the number of the indication modules is the same as the number of the output interfaces, and they correspond one to one. The control module is specifically used for: When the voltage amplitude exceeds a preset voltage range or the current amplitude exceeds a preset current range, the indication module corresponding to the output interface in the output state is controlled to send indication information.

7. The whole-station secondary equipment testing system according to claim 6, characterized in that: The indication module includes an indication lamp.

8. The whole-station secondary equipment testing system according to any one of claims 1 to 3, characterized in that: The switching module includes a relay.

9. The whole-station secondary equipment testing system according to any one of claims 1 to 3, characterized in that: The control module is specifically used for: Obtaining a switching control signal; Acquire a time calibration signal; Based on the switching control signal and the time calibration signal, the plurality of switching modules are controlled in a timing sequence to switch different output interfaces to an output state.

10. The whole-station secondary equipment testing system according to claim 9, characterized in that: The control module includes an industrial computer, a control circuit and a controller; The industrial computer is electrically connected to the control circuit, and the industrial computer is used to obtain the switching control signal, and convert the switching control signal into a logic signal and send it to the control circuit; The control circuit is electrically connected to the controller, and the control circuit is used to receive the time calibration signal and send the logic signal to the controller; The controller is electrically connected to the plurality of switching modules through the protection module, and is used for controlling the plurality of switching modules to switch different output interfaces to an output state in a timing sequence based on the switching control signal which is the logic signal and the time calibration signal.

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