FTU opening and closing pulse signal test method based on small signal relay protection instrument

Abstract

The invention discloses an FTU opening and closing pulse signal testing method based on a small signal relay protection instrument, and relates to the technical field of FTU opening and closing pulse signal testing, and the method comprises the steps: S1, achieving an IEC 60870-5-104 protocol on the small signal relay protection instrument; s2, developing a remote control pulse detection function of the small-signal relay protection instrument; s3, the Ethernet of the FTU and the Ethernet of the small-signal relay protection instrument are configured to be in the same network segment, and the FTU and the small-signal relay protection instrument are connected through a wire; s4, inputting a remote control command on the touch screen, and sending the command to the small signal relay protection instrument through an IEC 60870-5-104 protocol; s5, testing a closing pulse signal; and S6, switching-off pulse signal testing is carried out. The method is simple in parameter configuration and operation mode, and low in technical requirements on operators; a switch-on and switch-off signal during remote control of an operator can be tested; opening and closing operation data are recorded, which is convenient for operators to check.

Description

Technical Field

[0001] The invention relates to the technical field of FTU opening and closing pulse signal testing, in particular to a FTU opening and closing pulse signal testing method based on a small signal relay. Background Art

[0002] The opening and closing pulse signals in the FTU are mainly used to notify the local switch (such as a circuit breaker or other switchgear) to perform opening or closing operations when a fault is detected. The design and implementation of the opening and closing pulse signals require precise control to ensure that the operation can be performed quickly and accurately when necessary. In addition, the reliability of signal transmission needs to be ensured, because any communication failure may lead to control failure, which in turn affects the normal operation of the power system. Therefore, it is necessary to detect the FTU opening and closing pulse signals in the distribution network work.

[0003] The existing technology generally uses a relay to simulate typical fault conditions in the power system, such as overcurrent, short circuit, etc. When the FTU detects a fault and triggers the protection logic, the relay is used to monitor the output port to check whether the correct opening pulse signal is sent. However, the existing technology also has some defects. The operation of triggering a fault is relatively complicated. The operator needs to understand the fault principle and configure the equipment. The skill requirements for the user are too high. It is also impossible to test the opening and closing pulse signal when the dispatcher remotely controls the remote control, making the remote control steps more complicated. Summary of the invention

[0004] The purpose of the present invention is to provide a FTU opening and closing pulse signal testing method based on a small signal relay to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: a FTU opening and closing pulse signal testing method based on a small signal relay, the method comprising the steps of:

[0006] S1. Implement IEC 60870-5-104 protocol on small signal relays;

[0007] S2. Develop the remote control pulse detection function of the small signal relay protection instrument;

[0008] S3. Configure the Ethernet of FTU and small signal relay to be in the same network segment, and connect FTU and small signal relay with wires;

[0009] S4. Input the remote control command on the touch screen and send the command to the small signal relay through the IEC 60870-5-104 protocol;

[0010] S5, closing pulse signal test;

[0011] S6, opening pulse signal test.

[0012] According to the above content, in step S1: the IEC 60870-5-104 protocol includes the following steps:

[0013] S2-1. Design ASDU data format;

[0014] S2-2, implement TCP / IP connection management mechanism;

[0015] S2-3, write application layer command processing program;

[0016] S2-4. Design a state machine to handle changes in connection status;

[0017] S2-5. Input the remote control command through the touch screen and send the small signal closing command through the IEC 60870-5-104 protocol.

[0018] According to the above content, the data format includes a type identifier, a data length and an information object; the information is encoded in TLV format, wherein T represents the information type; L represents the data length; and V represents the specific data content; the byte order of the data is determined, and an additional flag bit is designed to indicate the state of the data, wherein the state of the data includes connection establishment or disconnection, data transmission status sending or receiving, opening success, failure or no signal detected, closing success, failure or no signal detected, and fault conditions;

[0019] The small signal relay creates a TCP socket and connects to the FTU; the FTU listens on the port and accepts the connection request of the small signal relay; after the connection is established, the flow control and congestion control mechanisms of TCP are used; the flow control ensures that the content sent by the small signal relay does not exceed the processing capacity of the FTU; the congestion control adjusts the data transmission rate when network congestion occurs to prevent data loss and delay;

[0020] The application layer command processing program is used to process the messages of the FTU, and the messages include remote control command messages and status feedback messages; the remote control command messages include remote control opening commands and remote control closing commands; the status feedback messages include confirmation and feedback of opening and closing states;

[0021] The changes in the connection status include connection establishment status, connection confirmation status, data transmission status, pulse signal detection status, pulse signal confirmation status, pulse signal failure status and connection closing status.

[0022] According to the above content, in step S2, a remote control pulse detection function is developed on the small signal relay protection instrument, including:

[0023] The opening detection point is designated as the digital input port D I1, which is used to receive and feedback the opening signal in real time; the closing detection point is designated as the digital input port DI2, which is used to receive and feedback the closing signal in real time; the opening output point is designated as output D01, which is used to output the opening confirmation signal from the small signal relay after detecting the qualified opening pulse signal, and the opening confirmation signal indicates that the opening operation is successfully executed; the closing output point is designated as output D02, which is used to output the closing confirmation signal from the small signal relay after detecting the qualified closing pulse signal, and the closing confirmation signal indicates that the closing operation is successfully executed;

[0024] Set the pulse signal amplitude range, pulse signal pulse width, voltage threshold, time window and sampling frequency; the pulse signal amplitude range ensures that the signal is not disturbed during transmission while maintaining the signal strength so that it can still be accurately identified at a long distance or in a complex environment. The amplitude range is set to match the working voltage of the equipment to ensure that the relay can work normally and detect qualified signals; the pulse signal pulse width ensures that the signal is long enough so that the system can accurately capture the opening action and avoid missed detection due to too short pulses. The setting of the pulse signal pulse width should take into account the response time of the small signal relay so that it can respond in time, thereby improving the reliability of the system; the voltage threshold, by setting a lower voltage threshold, can filter out possible noise interference and ensure that only signals exceeding the threshold are considered qualified, which can reduce the risk of false operation and ensure accuracy and timeliness;

[0025] When the opening pulse signal or the closing pulse signal is within the pulse signal amplitude range, meets the pulse signal pulse width, and the voltage exceeds the voltage threshold, the pulse signal is judged to be a qualified opening pulse signal or a qualified closing pulse signal; otherwise, the pulse signal is judged to be an unqualified opening pulse signal or an unqualified closing pulse signal;

[0026] When a qualified opening pulse signal or a qualified closing pulse signal is detected within the time window, the opening or closing is judged to be successful and recorded; when a qualified opening pulse signal or a qualified closing pulse signal is not detected within the time window, the opening or closing is judged to be failed and recorded; the sampling frequency is used to feedback state changes.

[0027] According to the above, in step S3:

[0028] The method of connecting the FTU and the small signal relay with a wire includes connecting the opening output, opening state, closing output and closing state of the FTU to DI1, DO1, DI2 and DO2 of the small signal relay with a wire.

[0029] According to the above content, in step S4: the touch screen includes a closing command button, an opening command button, a current state, an operation report and a pulse signal unqualified detection report;

[0030] The current state includes the open state and the closed state; the operation report includes real-time data, timestamp, state change and pass / fail; the real-time data includes the amplitude, pulse width and voltage of the pulse signal; the timestamp is used to add a timestamp after each qualified pulse signal is detected; the state change is used to record the execution state of the command; the pass / fail is used to record the judgment result; the pulse signal unqualified detection report includes the time window, pulse signal amplitude, pulse signal pulse width, pulse signal voltage and unqualified reason; the unqualified reason includes that the pulse signal is not detected within the time window or the detected pulse signal is unqualified; the unqualified pulse signal includes that the pulse signal is not within the pulse signal amplitude range, the pulse signal does not meet the pulse signal pulse width amplitude or the pulse signal voltage does not exceed the voltage threshold.

[0031] According to the above content, when the closing or opening command button is clicked, the touch screen sends a closing or opening command to the small signal relay through the IEC60870-5-104 protocol; after receiving the command, the small signal relay configures the detection point DI2 or DI1, and starts the time window, waiting for the closing or opening pulse signal from the FTU; when a closing or opening pulse signal that meets the standard is detected, DO2 or DO1 of the small signal relay will output a signal; the small signal relay will feed back the current status, operation report and pulse signal unqualified detection report to the touch screen.

[0032] According to the above, in step S5:

[0033] When the closing command button is clicked, the touch screen sends a closing command to the small signal relay through the IEC 60870-5-104 protocol; the FTU performs the closing operation according to the command content; after the small signal relay receives the closing command, the pulse detection function will start working; after opening the detection time window of DI2, the small signal relay will check whether there is a qualified closing pulse signal within the time window; if a qualified closing pulse signal is detected, DO2 of the small signal relay will output a closing confirmation signal, and the closing confirmation signal indicates that the closing operation is successfully executed;

[0034] If no qualified closing pulse signal is detected within the time window, the small signal relay will determine that the closing pulse signal is unqualified and generate a pulse signal unqualified detection report; the pulse signal unqualified detection report includes the time window, closing pulse signal amplitude, closing pulse signal pulse width, closing pulse signal voltage and unqualified reasons; the unqualified reasons include that the closing pulse signal is not detected within the time window and the closing pulse signal is unqualified; the unqualified closing pulse signal includes that the closing pulse signal is not within the pulse signal amplitude range, the closing pulse signal does not meet the pulse signal pulse width amplitude or the closing pulse signal voltage does not exceed the voltage threshold;

[0035] During the closing pulse detection process, the amplitude, pulse width and voltage of the closing pulse signal are recorded, and an operation report is generated; the operation report includes real-time data, timestamp, state change and pass / fail; the real-time data includes the amplitude, pulse width and voltage of the closing pulse signal; the timestamp is used to add a timestamp after each qualified closing pulse signal is detected; the state change is used to record the execution status of the closing command; the pass / fail is used to record the judgment result.

[0036] According to the above, in step S6:

[0037] When the opening command button is clicked, the touch screen sends an opening command to the small signal relay through the IEC 60870-5-104 protocol; the FTU performs the opening operation according to the command content; after the small signal relay receives the opening command, the pulse detection function will start working; after opening the detection time window of DI1, the small signal relay will check whether there is a qualified opening pulse signal within the time window; if a qualified opening pulse signal is detected, DO1 of the small signal relay will output an opening confirmation signal, and the opening confirmation signal indicates that the opening operation is successfully executed;

[0038] If no qualified opening pulse signal is detected within the time window, the small signal relay will determine that the opening pulse signal is unqualified and generate a pulse signal unqualified detection report; the pulse signal unqualified detection report includes the time window, the opening pulse signal amplitude, the opening pulse signal pulse width, the opening pulse signal voltage and the unqualified reason; the unqualified reason includes that the opening pulse signal is not detected within the time window and the opening pulse signal is unqualified; the unqualified opening pulse signal includes that the opening pulse signal is not within the pulse signal amplitude range, the opening pulse signal does not meet the pulse signal pulse width amplitude or the opening pulse signal voltage does not exceed the voltage threshold;

[0039] During the opening pulse detection process, the amplitude, pulse width and voltage of the opening pulse signal are recorded, and an operation report is generated; the operation report includes real-time data, timestamp, state change and pass / fail; the real-time data includes the amplitude, pulse width and voltage of the opening pulse signal; the timestamp is used to add a timestamp after each qualified opening pulse signal is detected; the state change is used to record the execution status of the opening command; the pass / fail is used to record the judgment result.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The parameter configuration and operation mode of the present invention are simple, and the technical requirements for operators are not high;

[0042] 2. The present invention can test the opening and closing signals of the operator during remote control;

[0043] 3. The present invention records the opening and closing operation data, which is convenient for operators to view. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flow chart of the steps of a FTU opening and closing pulse signal testing method based on a small signal relay protection instrument of the present invention;

[0045] Figure 2 The present invention is a flow chart of the steps of the IEC 60870-5-104 protocol for a FTU opening and closing pulse signal test method based on a small signal relay. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0047] Example: Figure 1-Figure 2 As shown, the present invention provides a technical solution, a FTU opening and closing pulse signal testing method based on a small signal relay;

[0048] Implement the IEC 60870-5-104 protocol on the small signal relay. Implementing the IEC 60870-5-104 protocol includes the following steps:

[0049] S2-1. Design the ASDU data format; the data format includes a type identifier, data length and information object; use the TLV format to encode the information, where T represents the information type; L represents the data length; and V represents the specific data content; determine the byte order of the data, and design additional flag bits to indicate the status of the data, the status of the data includes connection status establishment or disconnection, data transmission status sending or receiving, opening success, failure or no signal detected, closing success, failure or no signal detected, and fault conditions;

[0050] S2-2, implement TCP / IP connection management mechanism; the small signal relay creates a TCP socket and connects to the FTU; the FTU listens on the port and accepts the connection request of the small signal relay; after the connection is established, the flow control and congestion control mechanism of TCP are used; the flow control ensures that the content sent by the small signal relay does not exceed the processing capacity of the FTU; the congestion control adjusts the data transmission rate when the network is congested to prevent data loss and delay;

[0051] S2-3. Write an application layer command processing program; the application layer command processing program is used to process the FTU message, the message includes a remote control command message and a status feedback message; the remote control command message includes a remote control opening command and a remote control closing command; the status feedback message includes confirmation and feedback of the opening and closing status;

[0052] S2-4, design a state machine to handle changes in connection status; the changes in the connection status include connection establishment status, connection confirmation status, data transmission status, pulse signal detection status, pulse signal confirmation status, pulse signal failure status and connection closing status;

[0053] S2-5. Input the remote control command through the touch screen and send the small signal closing command through the IEC 60870-5-104 protocol.

[0054] The opening detection point is designated as the digital input port DI1, which is used to receive and feedback the opening signal in real time; the closing detection point is designated as the digital input port DI2, which is used to receive and feedback the closing signal in real time; the opening output point is designated as the output DO1, which is used to output the opening confirmation signal from the small signal relay after detecting the qualified opening pulse signal, and the opening confirmation signal indicates that the opening operation is successfully executed; the closing output point is designated as the output DO2, which is used to output the closing confirmation signal from the small signal relay after detecting the qualified closing pulse signal, and the closing confirmation signal indicates that the closing operation is successfully executed;

[0055] Set the pulse signal amplitude range to 24-48V, the pulse signal pulse width to 200-500ms, the voltage threshold to 8V, the time window to 2000ms and the sampling frequency to 1ms.

[0056] When the opening pulse signal or the closing pulse signal is within the pulse signal amplitude range, meets the pulse signal pulse width, and the voltage exceeds the voltage threshold, the pulse signal is judged to be a qualified opening pulse signal or a qualified closing pulse signal; otherwise, the pulse signal is judged to be an unqualified opening pulse signal or an unqualified closing pulse signal;

[0057] When a qualified opening pulse signal or a qualified closing pulse signal is detected within the time window, the opening or closing is judged to be successful and recorded; when a qualified opening pulse signal or a qualified closing pulse signal is not detected within the time window, the opening or closing is judged to be failed and recorded; the sampling frequency is used to feedback state changes.

[0058] Configure the Ethernet of FTU and small-signal relay to be in the same network segment, and use wires to connect the opening output, opening status, closing output and closing status of FTU to D I1, DO1, DI2 and DO2 of the small-signal relay.

[0059] Enter the remote control command through the touch screen, and send the command to the small signal relay through the IEC 60870-5-104 protocol; take the input of the remote control closing command as an example:

[0060] When the closing command button is clicked, the touch screen sends a closing command to the small signal relay through the IEC 60870-5-104 protocol; the FTU performs the closing operation according to the command content; after receiving the closing command, the pulse detection function of the small signal relay will start working; after opening the detection time window of DI2, wait for the closing pulse signal from the FTU; the small signal relay checks whether there is a qualified closing pulse signal within the time window; if a qualified closing pulse signal is detected, DO2 of the small signal relay will output a closing confirmation signal, and the output signal delay is 0, and the closing confirmation signal indicates that the closing operation is successfully executed;

[0061] If no qualified closing pulse signal is detected within the time window, the small signal relay will determine that the closing pulse signal is unqualified and generate a pulse signal unqualified detection report; the pulse signal unqualified detection report includes the time window, closing pulse signal amplitude, closing pulse signal pulse width, closing pulse signal voltage and unqualified reasons; the unqualified reasons include that the closing pulse signal is not detected within the time window and the closing pulse signal is unqualified; the unqualified closing pulse signal includes that the closing pulse signal is not within the pulse signal amplitude range, the closing pulse signal does not meet the pulse signal pulse width amplitude or the closing pulse signal voltage does not exceed the voltage threshold;

[0062] During the closing pulse detection process, the amplitude, pulse width and voltage of the closing pulse signal are recorded, and an operation report is generated; the operation report includes real-time data, timestamp, state change and pass / fail; the real-time data includes the amplitude, pulse width and voltage of the closing pulse signal; the timestamp is used to add a timestamp after each qualified closing pulse signal is detected; the state change is used to record the execution status of the closing command; the pass / fail is used to record the judgment result.

[0063] The present invention provides another embodiment, a touch screen viewing method in a FTU opening and closing pulse signal testing method based on a small signal relay:

[0064] The touch screen includes closing command button, opening command button, current status, operation report and pulse signal unqualified detection report;

[0065] When the operator presses the opening command button on the touch screen, the small signal relay starts to test the opening pulse signal and records the amplitude, pulse width and voltage of the opening pulse signal detected during the opening pulse signal test; if the opening pulse signal is qualified, an operation report is generated; if the opening pulse signal is unqualified, a pulse signal unqualified detection report is generated;

[0066] The operator can view the operation report and pulse signal unqualified detection report through the touch screen, and the operation report includes real-time data, timestamp, state change and pass / fail; the real-time data includes the amplitude, pulse width and voltage of the pulse signal; the timestamp is used to add a timestamp after each qualified pulse signal is detected; the state change is used to record the execution status of the command; the pass / fail is used to record the judgment result; the pulse signal unqualified detection report includes the time window, pulse signal amplitude, pulse signal pulse width, pulse signal voltage and unqualified reason; the unqualified reason includes that the pulse signal is not detected within the time window or the detected pulse signal is unqualified; the unqualified pulse signal includes that the pulse signal is not within the pulse signal amplitude range, the pulse signal does not meet the pulse signal pulse width amplitude or the pulse signal voltage does not exceed the voltage threshold.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A FTU opening and closing pulse signal testing method based on a small signal relay, characterized in that: The method comprises the steps of: S1. Implement IEC 60870-5-104 protocol on small signal relays; S2. Develop the remote control pulse detection function of the small signal relay protection instrument; S3. Configure the Ethernet of FTU and small signal relay to be in the same network segment, and connect FTU and small signal relay with wires; S4. Input remote control commands through the touch screen and send the commands to the small signal relay through the IEC 60870-5-104 protocol; S5, closing pulse signal test; S6, opening pulse signal test.

2. According to claim 1, a FTU opening and closing pulse signal testing method based on a small signal relay is characterized in that: In step S1: the IEC 60870-5-104 protocol includes the following steps: S2-1. Design ASDU data format; S2-2, implement TCP / IP connection management mechanism; S2-3, write application layer command processing program; S2-4. Design a state machine to handle changes in connection status; S2-5. Input the remote control command through the touch screen and send the small signal closing command through the IEC 60870-5-104 protocol.

3. A FTU opening and closing pulse signal testing method based on a small signal relay according to claim 2, characterized in that: The data format includes a type identifier, a data length, and an information object; the information is encoded in a TLV format, wherein T represents the information type; L represents the data length; and V represents the specific data content; the byte order of the data is determined, and an additional flag bit is designed to indicate the state of the data, wherein the state of the data includes connection establishment or disconnection, data transmission status sending or receiving, opening success, failure or no signal detection, closing success, failure or no signal detection, and fault conditions; The small signal relay creates a TCP socket and connects to the FTU; the FTU listens on the port and accepts the connection request of the small signal relay; after the connection is established, the flow control and congestion control mechanisms of TCP are used; the flow control ensures that the content sent by the small signal relay does not exceed the processing capacity of the FTU; the congestion control adjusts the data transmission rate when network congestion occurs to prevent data loss and delay; The application layer command processing program is used to process the messages of the FTU, and the messages include remote control command messages and status feedback messages; the remote control command messages include remote control opening commands and remote control closing commands; the status feedback messages include confirmation and feedback of opening and closing states; The changes in the connection status include connection establishment status, connection confirmation status, data transmission status, pulse signal detection status, pulse signal confirmation status, pulse signal failure status and connection closing status.

4. The FTU opening and closing pulse signal testing method based on a small signal relay according to claim 1 is characterized in that: In step S2, a remote control pulse detection function is developed on the small signal relay, including: The opening detection point is designated as the digital input port DI1, which is used to receive and feedback the opening signal in real time; the closing detection point is designated as the digital input port DI2, which is used to receive and feedback the closing signal in real time; the opening output point is designated as the output DO1, which is used to output the opening confirmation signal from the small signal relay after detecting the qualified opening pulse signal, and the opening confirmation signal indicates that the opening operation is successfully executed; the closing output point is designated as the output DO2, which is used to output the closing confirmation signal from the small signal relay after detecting the qualified closing pulse signal, and the closing confirmation signal indicates that the closing operation is successfully executed; Set the pulse signal amplitude range, pulse signal pulse width, voltage threshold, time window and sampling frequency; When the opening pulse signal or the closing pulse signal is within the pulse signal amplitude range, meets the pulse signal pulse width, and the voltage exceeds the voltage threshold, the pulse signal is judged to be a qualified opening pulse signal or a qualified closing pulse signal; otherwise, the pulse signal is judged to be an unqualified opening pulse signal or an unqualified closing pulse signal; When a qualified opening pulse signal or a qualified closing pulse signal is detected within the time window, the opening or closing is judged to be successful and recorded; when a qualified opening pulse signal or a qualified closing pulse signal is not detected within the time window, the opening or closing is judged to be failed and recorded; the sampling frequency is used to feedback state changes.

5. The FTU opening and closing pulse signal testing method based on a small signal relay according to claim 1 is characterized in that: In step S3: The method of connecting the FTU and the small signal relay with a wire includes connecting the opening output, opening state, closing output and closing state of the FTU to DI1, DO1, DI2 and DO2 of the small signal relay with a wire.

6. The FTU opening and closing pulse signal testing method based on a small signal relay according to claim 4 is characterized in that: In step S4: the touch screen includes a closing command button, an opening command button, a current status, an operation report, and a pulse signal unqualified detection report; The current state includes the open state and the closed state; the operation report includes real-time data, timestamp, state change and qualification; the real-time data includes the amplitude, pulse width and voltage of the pulse signal; the timestamp is used to add a timestamp after each qualified pulse signal is detected; The state change is used to record the execution state of the command; the pass or fail is used to record the judgment result; the pulse signal unqualified detection report includes the time window, pulse signal amplitude, pulse signal pulse width, pulse signal voltage and unqualified reason; The reasons for failure include failure to detect a pulse signal within the time window or an unqualified pulse signal; the unqualified pulse signal includes the pulse signal not being within the pulse signal amplitude range, the pulse signal not meeting the pulse signal pulse width amplitude, or the pulse signal voltage not exceeding the voltage threshold.

7. The FTU opening and closing pulse signal testing method based on a small signal relay according to claim 6 is characterized in that: When the closing or opening command button is clicked, the touch screen sends a closing or opening command to the small signal relay through the IEC 60870-5-104 protocol; after receiving the command, the small signal relay configures the detection point DI2 or DI1, and starts the time window to wait for the closing or opening pulse signal from the FTU; when a closing or opening pulse signal that meets the standard is detected, DO2 or DO1 of the small signal relay will output a signal; the small signal relay will feed back the current status, operation report and pulse signal unqualified detection report to the touch screen.

8. The FTU opening and closing pulse signal testing method based on a small signal relay according to claim 7 is characterized in that: In step S5: When the closing command button is clicked, the touch screen sends a closing command to the small signal relay through the IEC 60870-5-104 protocol; the FTU performs the closing operation according to the command content; after the small signal relay receives the closing command, the pulse detection function will start working; After the detection time window of DI2 is opened, the small signal relay will check whether there is a qualified closing pulse signal within the time window; if a qualified closing pulse signal is detected, DO2 of the small signal relay will output a closing confirmation signal, which indicates that the closing operation is successfully executed; If no qualified closing pulse signal is detected within the time window, the small signal relay will determine that the closing pulse signal is unqualified and generate a pulse signal unqualified detection report; the pulse signal unqualified detection report includes the time window, closing pulse signal amplitude, closing pulse signal pulse width, closing pulse signal voltage and unqualified reasons; The reasons for failure include failure to detect the closing pulse signal within the time window and failure of the closing pulse signal; the failure of the closing pulse signal includes the closing pulse signal not being within the pulse signal amplitude range, the closing pulse signal not meeting the pulse signal pulse width amplitude, or the closing pulse signal voltage not exceeding the voltage threshold; During the closing pulse detection process, the amplitude, pulse width and voltage of the closing pulse signal are recorded, and an operation report is generated; the operation report includes real-time data, timestamp, state change and qualification; the real-time data includes the amplitude, pulse width and voltage of the closing pulse signal; the timestamp is used to add a timestamp after each qualified closing pulse signal is detected; The state change is used to record the execution state of the closing command; the pass or fail is used to record the judgment result.

9. The FTU opening and closing pulse signal testing method based on a small signal relay according to claim 7 is characterized in that: In step S6: When the opening command button is clicked, the touch screen sends an opening command to the small signal relay through the IEC 60870-5-104 protocol; the FTU performs the opening operation according to the command content; after the small signal relay receives the opening command, the pulse detection function will start working; After opening the detection time window of DI1, the small signal relay will check whether there is a qualified opening pulse signal within the time window; if a qualified opening pulse signal is detected, D01 of the small signal relay will output an opening confirmation signal, which indicates that the opening operation is successfully executed; If no qualified opening pulse signal is detected within the time window, the small signal relay will determine that the opening pulse signal is unqualified and generate a pulse signal unqualified detection report; the pulse signal unqualified detection report includes the time window, the opening pulse signal amplitude, the opening pulse signal pulse width, the opening pulse signal voltage and the unqualified reason; The reasons for failure include failure to detect the opening pulse signal within the time window and the opening pulse signal failure; the failure of the opening pulse signal includes the opening pulse signal not being within the pulse signal amplitude range, the opening pulse signal not meeting the pulse signal pulse width amplitude, or the opening pulse signal voltage not exceeding the voltage threshold; During the opening pulse detection process, the amplitude, pulse width and voltage of the opening pulse signal are recorded, and an operation report is generated; the operation report includes real-time data, timestamp, state change and qualification; the real-time data includes the amplitude, pulse width and voltage of the opening pulse signal; the timestamp is used to add a timestamp after each qualified opening pulse signal is detected; The state change is used to record the execution state of the opening command; the pass or fail is used to record the judgment result.

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