A one-button automatic closed-loop test method for relay protection signals of main and substations in substations

Abstract

A one-button automatic closed-loop inspection method for relay protection signals of a substation master and substation, wherein the master station automatically sends signal inspection commands to the substations in batches point by point, generates an inspection rule base for the inspection points, and the substations forward the inspection commands to the relay protection devices after receiving them. The relay protection devices respond to the substation inspection commands according to the same rules in the inspection rule base and send messages to the corresponding signal points; the substations forward the messages returned by the relay protection devices to the master station after receiving them. The master station inspects the messages according to the pre-generated inspection rule base to determine whether the returned messages are correct, thereby achieving a closed-loop inspection of the relay protection signals from the master station, substations, to the relay protection devices, and ensuring the accuracy of communication and data transmission among the three. The present invention improves the automation and efficiency of online debugging of the security system and reduces the operation and maintenance costs of the security system through one-button automatic closed-loop inspection of the relay protection signals of the master and substations, thereby ensuring the stable operation of the security system and contributing to the security of the power grid.

Description

Technical Field

[0001] The present invention belongs to the technical field of remote operation and maintenance of transformer substation relay protection, and relates to a one-button automatic closed-loop testing method for transformer substation master and substation relay protection signals. Background Art

[0002] With the continuous expansion of power grids, various regions are stepping up efforts to develop protection fault information management systems (referred to as protection fault information management systems). These systems, comprised of a master station and substations, collect real-time operational status, configuration, and fault information from relay protection devices and safety automatic devices. These systems monitor their operating status, manage their configuration information, and analyze their operational behavior. This system is not only a crucial tool for relay protection, but also provides prompts to control personnel in the event of a grid fault, preventing operational errors and other incidents.

[0003] When the protection system is being debugged in a substation, the relay protection information points need to be verified. The existing substation information point verification method still uses the conventional mode, which adds quantities at the device end, that is, adds switching quantities and analog quantities at the device end, sends corresponding signals to the relay protection device, and checks the inspection results at the local background or remote master station. This method has the following problems:

[0004] 1. The manual workload is large and the efficiency is low. Generally, it takes at least two or three days to check the important signal points of a substation.

[0005] 2. Due to limitations in on-site conditions, it is often not possible to test all signal points, so the test results are difficult to guarantee;

[0006] 3. When the Baoxin substation is being debugged in the substation, other equipment and systems in the substation are often already debugged or even put into operation, making it inconvenient to increase the amount of equipment to verify various information;

[0007] 4. In actual operation, it may happen that after the security substation has been running for a period of time, due to various reasons, such as but not limited to the main station, substation, protection, channel, etc., the actual information sending function has become abnormal, but it has not been noticed. When a fault occurs, it is discovered that the information cannot be sent normally, especially the action information.

[0008] In response to the above problems, the present invention proposes a one-button automatic closed-loop inspection method for relay protection signals of substation master and substation. During the normal operation of substation equipment, the relay protection device can be triggered at the master station end with one button to send information of various points, thereby realizing the closed-loop inspection of the relay protection signal from the master station, substation to relay protection device throughout the entire process, and ensuring the accuracy of communication and data transmission among the three. Summary of the Invention

[0009] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a one-button automatic closed-loop inspection method for relay protection signals of the main and substations of substations. During the operation of the substation, the protection device can be triggered as needed to send various information, thereby confirming that various information can be correctly sent, ensuring that information can be received completely and correctly in the event of a fault, improving the automation level and efficiency of the online debugging of the security system, reducing the operation and maintenance cost of the security system, thereby ensuring the stable operation of the security system and contributing to the security of the power grid.

[0010] To achieve the above objectives, the present invention adopts the following technical solutions: A one-button automatic closed-loop test method for relay protection signals of a master and substation of a substation, the method comprising the following steps:

[0011] Step 1: Build a test rule base. The master station automatically sends test point information commands to the slave stations in batches after a one-click operation, and starts the master station test timeout timer.

[0012] Step 2: The slave station receives the inspection point information command issued by the master station in step 1 and forwards it to the relay protection device. The relay protection device responds to the inspection point information command according to the inspection rule base and sends the inspection signal message of the corresponding inspection point.

[0013] Step 3: After receiving the message returned by the relay protection device in step 2, the slave station forwards it to the master station. If the master station's inspection timeout has not expired, the slave station receives the corresponding inspection signal message returned by the relay protection device, and the master station's inspection timeout is terminated. The master station then verifies the inspection signal according to the inspection rule base to determine the correctness of the inspection signal.

[0014] Step 4: If the master station's inspection timeout period expires and no corresponding inspection signal message is received from the relay protection device, the master station directly determines that the inspection point result is abnormal;

[0015] Step 5: The master station determines whether the inspection of all inspection points is completed. If not, it continues to step 1 to enter the next inspection point inspection. If it is completed, the entire inspection process is stopped and the inspection report is output.

[0016] Preferably, in step 1, all test signals of a plurality of relay protection devices or a relay protection device in the substation are selected in batches for automatic closed-loop test, or automatic closed-loop test is performed on a single test signal.

[0017] Preferably, in step 1, the master station issues the inspection point information command in a manner of writing a value, where the value is a unique identifier of the inspection signal in the substation model.

[0018] Preferably, the inspection signal includes switching quantities and analog quantities, wherein the switching quantities include the remote signaling signals of the relay protection input, pressure plate, alarm, and event, and the analog quantities include the remote measurement signals of the relay protection current, voltage, temperature, and light intensity. According to the different characteristics of the switching quantities and analog quantities, a corresponding inspection point inspection rule base is generated.

[0019] Preferably, the rules of the switch quantity inspection rule base are that the relay protection device first sends a change message with the state inversion of the maintenance quality according to the current actual value of the inspection point, and then sends a change message with the maintenance quality to restore the current actual value after a certain interval, and finally sends a current actual value message without maintenance quality to restore the normal state.

[0020] Preferably, the rules of the analog quantity inspection rule base are that the relay protection device first sends a change message with maintenance quality according to the rule-changing value based on the current actual value of the inspection point, and then sends a change message with maintenance quality to restore the current actual value after a certain interval, and finally sends an actual value message without maintenance quality to restore to normal state.

[0021] Preferably, the analog quantity change rule is set to adopt a fixed value change and a proportional change to avoid a "dead zone" problem in the analog quantity change.

[0022] Preferably, the master station check timeout period can be set, and the default timeout period is 60 seconds.

[0023] Preferably, in step 3, the main station determines whether the test signal is correct by the following criteria: receiving a protection return message within the main station test timeout period; the return message and the test signal are at the same point; the value of the return message changes according to the rules of the test rule base; if all three are met, the test is normal, otherwise it is abnormal.

[0024] Preferably, in step 5, the master station inspection report includes total inspection statistical information and inspection information of each relay protection device.

[0025] The beneficial effect of the present invention is that, compared with the existing technology, the present invention realizes a closed-loop inspection of the relay protection signal from the master station, the substation to the relay protection device through a one-button automatic closed-loop inspection of the master-substation relay protection signal, thereby ensuring the accuracy of communication and data transmission among the three, improving the automation level and efficiency of the online debugging of the security system, and reducing the operation and maintenance cost of the security system, thereby ensuring the stable operation of the security system and contributing to the security of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic diagram of a one-button automatic closed-loop testing method for relay protection signals of a transformer substation master and substation.

[0027] Figure 2It is a flow chart of the relay protection device of the present invention sending a corresponding check point message in response to a check point information command according to a check rule base. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.

[0029] like Figure 1 As shown, the one-button automatic closed-loop test method for relay protection signals of a substation master and substation according to the present invention comprises the following steps:

[0030] Step 1: Build a verification rule library. With a single click, the master station automatically issues verification point information commands to the slave stations in batches, starting the master station verification timeout. As understood, "one-click" or "one-click operation" in this invention means that, after verification is initiated, a fully automated closed-loop verification of relay protection signals from the master station, slave stations, and relay protection devices is completed automatically, from start to finish, with report generation, without the need for human intervention.

[0031] In a preferred but non-limiting embodiment of the present invention, the master station's one-touch verification can batch-select multiple relay protection devices within a substation, or all signals from a single relay protection device, for automatic closed-loop verification. It can also perform automatic closed-loop verification on a single signal. As another improvement over the prior art and a beneficial technical effect achieved by the present invention, batch selection and automatic verification further address the technical problem in the prior art where, due to limited field conditions, it is often not possible to verify all signal points, resulting in difficulty in guaranteeing test results.

[0032] The master station issues a checkpoint information command in the form of writing a value, and the value is the unique identifier of the specific master station check signal in the substation model. It is worth noting that as an improvement of the existing technology and another beneficial technical effect that can be achieved by the present invention, the one-button automatic closed-loop test method for the substation master and substation relay protection signals provided by the present invention is applicable to both conventional substations and smart substations. For example, but not limited to, for smart substations, the IEC61850 model can be used. This solves the technical difficulty that when the existing technology of the substation is debugged in the substation, many other equipment and systems of the substation have been debugged or even put into operation, making it inconvenient to increase the amount of various information tests on the equipment side.

[0033] It's worth noting that the verification rule base is a set of rules agreed upon between the master station and the relay protection device based on different data types. The master station's verification signals include both binary and analog quantities. Binary quantities include relay protection inputs, pressure plates, alarms, and events, along with telemetered signals such as current, voltage, temperature, and light intensity. Based on the different characteristics of binary and analog quantities, a corresponding verification rule base is generated for each checkpoint.

[0034] In a preferred but non-restrictive embodiment of the present invention, the rules of the switch quantity inspection rule base are that the relay protection device first sends a change message with the state inverted with maintenance quality according to the current actual value of the inspection point, and then sends a change message with the current actual value restored with maintenance quality after a certain interval, and finally sends a current actual value message without maintenance quality to restore to normal state.

[0035] In a preferred but non-restrictive embodiment of the present invention, the rules of the analog quantity inspection rule base are that the relay protection device first sends a change message with maintenance quality according to the rule-changing value based on the current actual value of the inspection point, and then sends a change message with maintenance quality to restore the current actual value after a certain interval, and finally sends an actual value message without maintenance quality to restore to normal state.

[0036] Furthermore, in order to avoid the "dead zone" problem of analog quantity changes, the analog quantity change rule is set as follows: when the analog quantity value is small, the judgment parameter is an absolute value less than 10, and a fixed value change is adopted, and the change parameter used is plus 1; when the analog quantity value is large, the judgment parameter is an absolute value greater than or equal to 10, and a proportional change is adopted, and the change parameter used is plus 10%.

[0037] It can be understood that the above-mentioned inspection rule base is a preferred implementation method of the technical solution of the present invention, but not the only implementation method. Within the scope of the core concept of the present invention, technical personnel in this field can refer to but not be limited to the following principles when constructing the inspection rule base. First, it is necessary to reflect data changes. Second, there cannot be too many data frames, otherwise it will be too time-consuming and cannot affect the protection and the normal functions of the master and substations. Third, after the inspection is completed, the protection must be restored to normal.

[0038] In a preferred but non-limiting embodiment of the present invention, the master station check timeout period can be set, and the default timeout period is 60 seconds.

[0039] Step 2: The slave station receives the checkpoint information command sent by the master station in step 1 and forwards it to the relay protection device. The relay protection device responds to the checkpoint information command according to the inspection rule base and sends the corresponding checkpoint message. More specifically, step 2 includes:

[0040] Step 2.1: The relay protection device searches for the checkpoint based on the unique identifier in the substation model. If it does not exist, it sends a search failure message, which is forwarded to the master station through the substation. The master station then enters the next point verification process. If the checkpoint exists in the relay protection device, it proceeds to step 2.2.

[0041] The relay protection device responds to the inspection point information command according to the inspection rule base, and sends the corresponding inspection point message through three processes, such as Figure 2 shown.

[0042] Step 2.2, i.e. process 1: at this time, the relay protection device is in the current normal operation state, which is also the initial state of verification.

[0043] Step 2.3, i.e. process 2: at this time, it is the verification process state, using sending two frames of change messages;

[0044] In a preferred but non-limiting embodiment of the present invention, according to the preferred inspection rule base provided in step 1, when the current point is a switch type, a change message with the inverted state of the maintenance quality is first sent based on the current value of the point. That is, if the current value is closed, a change message is sent to the upper level. If the current value is open, a change message is sent to the upper level. Then, after a set interval, a change message with the maintenance quality is sent to restore the current actual value. Finally, a change message without the maintenance quality is sent to restore the current actual value to normal. It is worth noting that the setting of the interval time can be affected by network factors. If it is too short, the master station may not detect it, while if it is too long, it will affect efficiency.

[0045] In a preferred but non-restrictive embodiment of the present invention, also according to the preferred inspection rule base given in step 1, when the current point is an analog type, the relay protection device also sends two frames of change messages, first sending a change message with maintenance quality of the current actual value, and then sending a change message with maintenance quality to restore the current actual value. When the analog value is small, the judgment parameter is an absolute value less than 10, and a fixed value change is adopted, and the change parameter used is plus 1; when the analog value is large, the judgment parameter is an absolute value greater than or equal to 10, and a proportional change is adopted, and the change parameter used is plus 10%, thereby ensuring that the analog change master station and substation can avoid the "dead zone".

[0046] Step 2.4, also known as Process 3: At this point, the inspection of this checkpoint is complete, the protection is restored to its current actual state, and finally a message is sent indicating the actual value of the normal state without the maintenance quality. This ensures that after the information point verification is completed, the master station's collected state, the slave station's collected state, and the actual state of the relay protection device are consistent.

[0047] Step 3: After receiving the message returned by the relay protection device in step 2, the substation forwards it to the main station. If the main station inspection timeout period has not expired, it receives the corresponding inspection signal message returned by the relay protection device, and ends the main station inspection timeout period. The main station performs verification according to the inspection rule base to determine the correctness of the inspection signal.

[0048] The master station determines the correctness of the test signal based on the following criteria: receiving a return message from the relay protection device within the timeout period; the return message and the test signal are at the same point; and the value of the return message changes according to the rules in the test rule base. If all three conditions are met, the test is normal; otherwise, it is abnormal.

[0049] Step 4: When the master station's inspection timeout period expires and no corresponding inspection signal message is received from the relay protection device, the master station directly determines that the inspection signal result is abnormal.

[0050] A timeout occurs in two situations:

[0051] 1) The link is disconnected and the relay protection device information cannot be returned to the master station through the slave station. In this case, the link is abnormal.

[0052] 2) The message returned by the relay protection device is not the checkpoint information, which means the channel is abnormal.

[0053] Step 5: The master station determines whether all inspections are completed. If not, it continues to step 1 to enter the next signal inspection. If completed, it stops the entire inspection process and gives a report for this inspection.

[0054] The master station inspection report includes overall inspection statistics and inspection information for each device. Statistics include inspection start time, inspection end time, number of inspected devices, number of normal devices, number of abnormal devices, total number of inspection signals, total number of normal signals, total number of abnormal signals, total number of inspection signals, number of inspected switch quantities, number of normal switch quantities, number of abnormal switch quantities, number of inspected analog quantities, number of normal analog quantities, and number of abnormal analog quantities. Device inspection information details the inspection status of each device, including device name, device inspection switch quantity, and device inspection analog quantity statistics. Abnormal inspection signals include signal name, signal type, inspection time, and inspection conclusion. Abnormal inspection signals are classified into switch quantities and analog quantities, with inspection times accurate to milliseconds. Inspection conclusions reflect the cause of the abnormality, such as timeout or non-receipt, or values that do not meet requirements.

[0055] Inspection reports support historical query and display, printing and exporting of documents, and other management. The document format is for example, but not limited to, Word.

[0056] An example inspection report is shown below.

[0057]

[0058]

[0059] Compared with the existing technology, the beneficial effect of the present invention is that, compared with the existing technology, the present invention realizes the closed-loop inspection of the relay protection signal from the master station, the substation to the relay protection device through one-button automatic closed-loop inspection of the master-substation relay protection signal, ensures the accuracy of communication and data transmission among the three, improves the automation level and efficiency of the online debugging of the security system, reduces the operation and maintenance cost of the security system, thereby ensuring the stable operation of the security system and contributing to the security of the power grid.

[0060] The applicant of the present invention has made a detailed explanation and description of the implementation examples of the present invention in conjunction with the drawings in the specification. However, those skilled in the art should understand that the above implementation examples are only preferred implementation plans of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, and is not a limitation on the scope of protection of the present invention. On the contrary, any improvements or modifications based on the inventive spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. A one-button automatic closed-loop test method for relay protection signals of a substation master and substation, characterized in that: The method comprises the following steps: Step 1: Build a test rule library. After a one-click operation, the master station automatically sends test point information commands to the slave stations in batches and starts the master station test timeout timer. Test signals include switching quantities and analog quantities. Switching quantities include relay protection input, pressure plate, alarm, and event telemetering signals. Analog quantities include relay protection current, voltage, temperature, and light intensity telemetry signals. Based on the different characteristics of switching quantities and analog quantities, a corresponding test point test rule library is generated. The rules of the switch value inspection rule base are as follows: the relay protection device first sends a change message with the maintenance quality inverted based on the current actual value of the inspection point, then sends a change message with the maintenance quality restored to the current actual value after a certain interval, and finally sends a current actual value message without maintenance quality restored to the normal state; The rules of the analog quantity verification rule base are as follows: the relay protection device first sends a change message with maintenance quality according to the rule-based change value based on the current actual value of the inspection point. Then, after a certain interval, it sends a change message with maintenance quality to restore the current actual value. Finally, it sends an actual value message without maintenance quality to restore the normal state. Step 2: The slave station receives the inspection point information command issued by the master station in step 1 and forwards it to the relay protection device. The relay protection device responds to the inspection point information command according to the inspection rule base and sends the inspection signal message of the corresponding inspection point. Step 3: After receiving the return message from the relay protection device in step 2, the slave station forwards it to the master station. If the master station's inspection timeout has not expired, the slave station receives the corresponding inspection signal message returned by the relay protection device, and the master station's inspection timeout is terminated. The master station then verifies the correctness of the inspection signal according to the inspection rule base. The master station's judgment of the correctness of the inspection signal includes the following criteria: receiving the protection return message within the master station inspection timeout; the return message and the inspection signal are at the same point; and the value of the return message changes according to the rules of the inspection rule base. If all three conditions are met, the inspection is normal; otherwise, it is abnormal. Step 4: If the master station's inspection timeout period expires and no corresponding inspection signal message is received from the relay protection device, the master station directly determines that the inspection point result is abnormal; Step 5: The master station determines whether the inspection of all inspection points is completed. If not, it continues to step 1 to enter the next inspection point inspection. If it is completed, the entire inspection process is stopped and the inspection report is output.

2. The one-button automatic closed-loop test method for relay protection signals of a substation master and substation according to claim 1 is characterized in that: In step 1, multiple relay protection devices in the substation or all test signals of one relay protection device are batch selected for automatic closed-loop test, or automatic closed-loop test is performed on a single test signal.

3. The one-button automatic closed-loop test method for relay protection signals of a substation master and substation according to claim 1 is characterized in that: In step 1, the master station issues a checkpoint information command in the form of writing a value, where the value is the unique identifier of the checkpoint signal in the substation model.

4. The one-button automatic closed-loop test method for relay protection signals of a substation master and substation according to claim 1 is characterized in that: The analog quantity change rule is set to adopt fixed value change and proportional change to avoid the "dead zone" problem of analog quantity change.

5. The one-button automatic closed-loop test method for relay protection signals of a substation master and substation according to claim 1 is characterized in that: The master station inspection timeout can be set, and the default timeout is 60 seconds.

6. The one-button automatic closed-loop test method for relay protection signals of a substation master and substation according to claim 1 is characterized in that: In step 5, the master station inspection report includes the overall inspection statistics and the inspection information of each relay protection device.

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