On-load tap-changer on-line monitoring method and system

Abstract

The invention discloses an on-load tap-changer on-line monitoring method and system, and relates to the technical field of power equipment. Communication information between an on-load tap-changer monitoring master station and an on-load tap-changer controller is intercepted; after the specific gear shifting message is received, delaying a preset delay duration; and after the time delay is finished, acquiring the output voltage, the output current, the input voltage and the input current of the on-load tap-changer, and uploading the output voltage, the output current, the input voltage and the input current to the on-load tap-changer monitoring master station. Compared with the prior art, the method has the advantages that the message between the on-load tap-changer monitoring master station and the on-load tap-changer controller is monitored, the monitored specific gear shifting message is used as the initial criterion of data acquisition, and the delay duration is set, so that the data acquisition quantity can be reduced while the data integrity is ensured; furthermore, the output voltage and current and the input voltage and current of the on-load tap-changer are selected as the monitoring data, so that the accurate monitoring of the running state of the on-load tap-changer can be further ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to an on-load tap changer online monitoring method and system. Background Art

[0002] On-load tap changers are important power equipment in power systems, and online monitoring of their operating status is crucial to maintaining safe and stable operation of power grids. Traditional on-load tap changer online monitoring systems mostly use high-end CPUs (Central Processing Units), high-speed acquisition components, and large-capacity storage components, and collect vibration signals and drive motor current signals of on-load tap changers in real time. However, the existing monitoring methods require a huge amount of data to be collected and processed, which places high demands on the performance of various components of the on-load tap changer online monitoring system, increases the difficulty of data processing, and reduces the efficiency of data processing. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide an on-load tap changer online monitoring method and system, which can achieve accurate monitoring of the operating status of the on-load tap changer while reducing the amount of data collection and data processing.

[0004] To achieve the above object, an embodiment of the present invention provides an on-load tap changer online monitoring method, comprising:

[0005] Listen to the communication information between the on-load tapchanger monitoring master station and the on-load tapchanger controller;

[0006] After receiving the specific file adjustment message, delay for the predetermined delay time;

[0007] After the delay ends, the gear adjustment process data of the on-load tap-changing transformer is collected; wherein the gear adjustment process data includes the output voltage, output current, input voltage and input current of the on-load tap-changing transformer;

[0008] The gear shifting process data is uploaded to the on-load tap changer monitoring master station for use in status analysis of the on-load tap changer.

[0009] As an improvement of the above solution, the method of monitoring the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller includes:

[0010] Acquiring a message communicated between the on-load tap changer monitoring master station and the on-load tap changer controller;

[0011] Determining whether the message is a valid message according to the length and error check code of the message;

[0012] When the message is a valid message, it is determined whether the message is a specific gear adjustment message; wherein the specific gear adjustment message is pre-set according to the type of the on-load tap changer.

[0013] As an improvement of the above solution, before monitoring the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller, it also includes initializing the delay, serial port, memory and communication protocol, and setting the delay time.

[0014] As an improvement of the above solution, the delay duration is set according to the driving motor power and the spring design parameters.

[0015] As an improvement of the above scheme, before collecting the gear adjustment process data of the on-load tap-changing transformer, it also includes setting the sampling time, sampling frequency and sampling accuracy according to the specific gear adjustment message.

[0016] As an improvement of the above solution, uploading the gear shifting process data to the on-load tap changer monitoring master station includes:

[0017] receiving a request for reading data preparation state variables from the on-load tap changer monitoring master station;

[0018] Sending data preparation status variables to the on-load tap changer monitoring master station;

[0019] Receive the data collection frame instruction sent by the on-load tap changer monitoring master station, and upload the file adjustment process data frame by frame.

[0020] To achieve the above objectives, an embodiment of the present invention further provides an on-load tap changer online monitoring system, the on-load tap changer online monitoring system comprising an on-load tap changer monitoring main station and an on-load tap changer monitoring substation, and the on-load tap changer monitoring substation executes the on-load tap changer online monitoring method as described in any of the above embodiments when running.

[0021] Compared with the prior art, the on-load tap changer online monitoring method and system described in the embodiment of the present invention monitors the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller; after receiving the specific gear adjustment message, delays for a predetermined delay time; after the delay ends, the output voltage, output current, input voltage and input current of the on-load tap changer transformer are collected and uploaded to the on-load tap changer monitoring master station. Compared with the prior art that collects data under the full operation state, the embodiment of the present invention monitors the communication message between the on-load tap changer monitoring master station and the on-load tap changer controller, uses the specific gear adjustment message as the starting criterion for collecting data and sets the delay time, which can reduce the amount of data collection while ensuring data integrity; further, the embodiment of the present invention selects the output voltage and current and the input voltage and current of the on-load tap changer transformer as monitoring data, which can further ensure accurate monitoring of the operating state of the on-load tap changer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flow chart of an on-load tap changer online monitoring method provided by one embodiment of the present invention;

[0023] Figure 2 This is a flow chart of an on-load tap changer online monitoring method provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1 , is a flow chart of an on-load tap changer online monitoring method provided by an embodiment of the present invention, comprising steps S1 to S4:

[0026] S1, monitoring the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller;

[0027] S2, after receiving the specific file adjustment message, delay for a predetermined delay time;

[0028] S3. After the delay ends, the gear adjustment process data of the on-load tap-changing transformer is collected; wherein the gear adjustment process data includes the output voltage, output current, input voltage and input current of the on-load tap-changing transformer;

[0029] S4. Uploading the gear shifting process data to the on-load tap changer monitoring master station for use in status analysis of the on-load tap changer.

[0030] It is worth noting that the on-load tap changer online monitoring method described in the embodiment of the present invention is implemented by the on-load tap changer monitoring substation, and the on-load tap changer monitoring substation and the on-load tap changer monitoring main station together constitute an on-load tap changer online monitoring system. Specifically, in the on-load tap changer online monitoring system, the on-load tap changer monitoring system substation is responsible for data collection, storage and uploading of the on-load tap changer gear adjustment process, and the on-load tap changer monitoring main station is responsible for data processing and result display.

[0031] Furthermore, the operation process of the on-load tap changer substation includes the following seven states: initialization state, listening state, frame receiving state, frame decoding state, delay state, sampling state and communication data uploading state.

[0032] As an optional implementation manner, before monitoring the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller, the method further includes step S01, initializing the delay, serial port, memory and communication protocol, and setting the delay time.

[0033] Specifically, after the on-load tapchanger monitoring substation is powered on, it will undergo initialization operations, including initialization delay, serial port, memory and communication protocol, and configure the sampling time, predetermined delay time, define the on-load tapchanger specific adjustment message, and set the data preparation state variable to 0, where the data preparation state variable is used to indicate whether data uploading can be started.

[0034] Further, in the initialization state, the on-load tap changer monitoring substation executes step S02, enabling the listening serial port and the uploading serial port, after which the on-load tap changer enters the listening state in the substation.

[0035] In the listening state, the on-load tap changer monitoring substation executes step S1, monitoring the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller.

[0036] As an optional implementation manner, the monitoring of communication information between the on-load tap changer monitoring master station and the on-load tap changer controller (step S1) includes:

[0037] S11, obtaining a message communicated between the on-load tap changer monitoring master station and the on-load tap changer controller;

[0038] S12, judging whether the message is a valid message according to the length and error check code of the message;

[0039] S13. When the message is a valid message, determine whether the message is a specific gear adjustment message; wherein the specific gear adjustment message is pre-set according to the type of the on-load tap changer.

[0040] In the listening state, the on-load tapchanger monitoring substation will listen to the messages communicated between the on-load tapchanger master station and the on-load tapchanger controller. Once a frame of message is received, the on-load tapchanger monitoring substation enters the frame receiving state.

[0041] In the frame receiving state, the on-load tap changer monitoring substation executes step S12, that is, the on-load tap changer monitoring system substation determines whether the message is a valid message according to the length and error check code of the message. If it is a valid message, the on-load tap changer monitoring substation enters the frame de-framing state and executes step S13. Otherwise, the on-load tap changer monitoring substation returns to the listening state, that is, executes step S1.

[0042] Furthermore, in the de-framing state, the on-load tap changer monitoring substation determines whether the message is a specific file adjustment message. If it is a specific file adjustment message, the listening serial port and the uploading serial port are prohibited, and the on-load tap changer monitoring substation enters the delay state, otherwise, the on-load tap changer monitoring substation returns to the listening state.

[0043] It is worth noting that the specific gear adjustment message can be used as a basis for determining the gear adjustment action of the on-load tap changer, and using the gear adjustment action of the on-load tap changer as a basis for determining when to start collecting data can not only ensure that the state change of the on-load tap changer is captured in a timely manner, but also reduce the collection of redundant information. Therefore, the embodiment of the present invention uses the interception of the specific gear adjustment message as the starting criterion for collecting data.

[0044] Furthermore, different on-load tap changers use different specific gear adjustment messages, which require special settings. Taking the HWGK-TD on-load tap changer with online oil filter intelligent controller as an example, the specific gear adjustment message includes an on-load tap changer up-shift message and an on-load tap changer down-shift message, among which the on-load tap changer up-shift message is 01050005FF009C3B, and the on-load tap changer down-shift message is 01050006FF006C3B.

[0045] Furthermore, in the delay state, the on-load tap changer monitoring substation will execute step S2, that is, the delay will be turned on. After the preset delay time ends, the on-load tap changer monitoring substation enters the sampling state.

[0046] It is worth noting that the reason why the embodiment of the present invention starts to collect data after a certain delay is that after the gear adjustment instruction is issued, the on-load tap changer needs to store spring energy before the gear adjustment, and the electrical signal does not change significantly during the spring energy storage process, so it is not meaningful to collect data in this process. Further, the on-load tap changer monitoring substation determines whether the delay is over by enabling the timer and monitoring whether the timer overflows.

[0047] As an optional implementation manner, the delay duration is set according to the driving motor power and the spring design parameters.

[0048] It is worth noting that the delay duration is set according to the drive motor power and the spring design parameters. The basic requirement is to be able to start data collection before the on-load tap changer starts switching.

[0049] Compared with the prior art, the embodiment of the present invention sets a delay time and starts collecting data only after the delay ends. This can reduce the amount of data collection without affecting the integrity of the collected data, thereby reducing the amount of data storage and data calculation, and further reducing storage costs and computing costs.

[0050] As an optional implementation manner, before collecting the gear adjustment process data of the on-load tap-changing transformer, it also includes setting the sampling time, sampling frequency and sampling accuracy according to the specific gear adjustment message.

[0051] It is worth noting that, in the sampling state, the on-load tap changer monitoring substation will set the sampling frequency, sampling accuracy and sampling time according to the specific gear adjustment message, wherein the setting of the sampling time also needs to consider the performance of the on-load tap changer monitoring substation. Further, in the sampling state, the on-load tap changer monitoring substation collects the gear adjustment process data of the on-load tap changer transformer and stores it in sequence to the memory, wherein the gear adjustment process data includes the output voltage, output current, input voltage and input current of the on-load tap changer transformer. Further, after the sampling time ends, the on-load tap changer monitoring substation enables the upload serial port and sets the data preparation state variable to 1, after which the on-load tap changer monitoring substation enters the communication data upload state, i.e., executes step S4.

[0052] Compared with the prior art that collects data under the full operating state, the embodiment of the present invention only collects data of the on-load tap changer shifting process, thereby greatly reducing the amount of data collection while ensuring the required data integrity, and can reduce data storage costs and computing costs; further, the embodiment of the present invention selects the output voltage and current and the input voltage and current of the on-load tap changer as monitoring data for the on-load tap changer monitoring master station to determine the switching state of the on-load tap changer, thereby achieving more accurate monitoring of the on-load tap changer state.

[0053] As an optional implementation manner, uploading the gear shifting process data to the on-load tap changer monitoring master station (step S4) includes:

[0054] S41, receiving a request from the on-load tap changer monitoring master station to read data preparation state variables;

[0055] S42, sending data preparation state variables to the on-load tap changer monitoring master station;

[0056] S43, receiving the data collection frame instruction sent by the on-load tap changer monitoring master station, and uploading the file adjustment process data frame by frame.

[0057] It is worth noting that in the communication data upload state, the on-load tap changer monitoring substation receives the request for reading the data preparation state variable sent by the on-load tap changer monitoring master station, and replies with the data preparation state variable (1). Subsequently, the on-load tap changer monitoring substation will receive the request data acquisition frame instruction sent by the on-load tap changer monitoring master station and upload the data, that is, starting from the first frame of data, repeat the process of requesting / uploading data until all data is uploaded. For example, the Modbus communication protocol can be used when uploading data.

[0058] It is worth noting that during the operation of the on-load tap changer monitoring substation, the on-load tap changer monitoring master station will continuously send a request to read the data preparation state variable. When the on-load tap changer monitoring substation is in other states, the upload serial port of the on-load tap changer monitoring substation is in a disabled state, so the on-load tap changer monitoring substation does not respond to the request to read the data preparation state variable; when the on-load tap changer monitoring substation is in a communication data upload state, the upload serial port of the on-load tap changer monitoring substation is in an open state. When the on-load tap changer monitoring master station sends a request to read the data preparation state variable, the on-load tap changer monitoring substation replies that the variable is 1, and then the on-load tap changer monitoring system master station starts to continuously send a request to collect data frame instructions, and the on-load tap changer monitoring substation starts to upload the adjustment process data frame by frame.

[0059] Furthermore, when the data of the shifting process is uploaded, the on-load tapchanger monitoring substation sets the data preparation state variable to 0, opens the listening serial port, and returns to the listening state.

[0060] In order to better understand the on-line monitoring method of the on-load tap-changer, an example is given below. Figure 2 , is a flow chart of an on-load tap changer online monitoring method provided by another embodiment of the present invention, Figure 2 In the figure, the two rectangular boxes represent the on-load tapchanger monitoring master station and the on-load tapchanger monitoring substation respectively, and the circle represents the status of the on-load tapchanger monitoring substation, including initialization status, listening status, frame receiving status, frame decoding status, delay status, sampling status and communication uploading data status, among which other status refers to the status other than the communication uploading data status.

[0061] Specifically, the on-load tap changer monitoring substation enters the initialization state after being powered on and processed; in the initialization state, the on-load tap changer monitoring substation enables the listening serial port and the uploading serial port, and then enters the listening state; in the listening state, the on-load tap changer monitoring substation enters the frame receiving state every time it hears a frame of communication message between the on-load tap changer monitoring master station and the on-load tap changer controller; in the frame receiving state, the on-load tap changer monitoring substation detects whether the message is a valid message, if the message is not a valid message, it returns to the listening state, if the message is a valid message, it enters the de-framing state; in the de-framing state, The on-load tap changer monitoring substation determines whether the message is a specific file adjustment message. If the message is not a specific file adjustment message, it returns to the listening state. If the message is a specific file adjustment message, it enters the delay state and prohibits the listening serial port and the uploading serial port. In the delay state, the on-load tap changer monitoring substation enables the timer to count. After the predetermined delay time, the on-load tap changer monitoring substation enters the sampling state. In the sampling state, the on-load tap changer monitoring substation collects the input voltage and current and the output voltage and current of the on-load tap changer according to the set collection frequency and collection time and stores them in the memory in sequence. In the data collection After the storage is completed, the on-load tap changer monitoring substation enables the upload serial port and sets the data preparation state variable to 1, and then enters the communication data upload state; in the communication data upload state, the on-load tap changer monitoring substation uploads the stored data frame by frame to the on-load tap changer monitoring master station according to the data storage order in the Modbus communication protocol. Specifically, the on-load tap changer monitoring master station sends an instruction to request the first frame of data, and the on-load tap changer monitoring substation uploads the first frame of data, then the on-load tap changer monitoring master station sends an instruction to request the second frame of data, and the on-load tap changer monitoring substation uploads the second frame of data, and repeats the upload. The steps of requesting and uploading data are performed until the last frame of data is uploaded; after the data upload is completed, the on-load tapchanger monitoring substation sets the data preparation state variable to 0 to indicate that the uploading of this sampling is completed, and reopens the listening serial port to return to the listening mode; further, during the entire operation period, the on-load tapchanger monitoring master station continuously sends a request to read the data preparation state variable to the on-load tapchanger monitoring substation. In other states, the on-load tapchanger monitoring substation does not respond to the request. However, if the on-load tapchanger monitoring substation is in the communication data uploading state, it responds to the data preparation state variable "1".

[0062] Compared with the prior art, the on-load tap changer online monitoring method described in the embodiment of the present invention listens to the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller; after receiving the specific gear adjustment message, delays for a predetermined delay time; after the delay ends, the output voltage, output current, input voltage and input current of the on-load tap changer transformer are collected and uploaded to the on-load tap changer monitoring master station. Compared with the prior art that collects data in the full operation state, the embodiment of the present invention listens to the communication message between the on-load tap changer monitoring master station and the on-load tap changer controller, uses the specific gear adjustment message as the starting criterion for collecting data and sets the delay time, which can reduce the amount of data collection while ensuring data integrity; further, the embodiment of the present invention selects the output voltage and current and the input voltage and current of the on-load tap changer transformer as monitoring data, which can further ensure accurate monitoring of the operating state of the on-load tap changer.

[0063] An embodiment of the present invention further provides an on-load tap changer online monitoring system, comprising an on-load tap changer monitoring main station and an on-load tap changer monitoring substation. When the on-load tap changer monitoring substation is in operation, the on-load tap changer online monitoring method as described in any of the above embodiments is executed.

[0064] Compared with the prior art, the on-load tap changer online monitoring system described in the embodiment of the present invention includes an on-load tap changer monitoring main station and an on-load tap changer monitoring substation, wherein the on-load tap changer monitoring substation monitors the communication information between the on-load tap changer monitoring main station and the on-load tap changer controller; after receiving a specific gear adjustment message, the predetermined delay time is delayed; after the delay ends, the output voltage, output current, input voltage and input current of the on-load tap changer transformer are collected and uploaded to the on-load tap changer monitoring main station. Compared with the prior art that collects data in the full operation state, the embodiment of the present invention monitors the communication message between the on-load tap changer monitoring main station and the on-load tap changer controller, uses the specific gear adjustment message as the starting criterion for collecting data and sets the delay time, thereby reducing the amount of data collected while ensuring data integrity; further, the embodiment of the present invention selects the output voltage and current and the input voltage and current of the on-load tap changer transformer as monitoring data, thereby further ensuring accurate monitoring of the operation state of the on-load tap changer.

[0065] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for online monitoring of an on-load tap changer, characterized in that: include: Listen to the communication information between the on-load tap-changer monitoring master station and the on-load tap-changer controller; After receiving a specific file adjustment message, delay for a predetermined delay time; After the delay ends, the gear adjustment process data of the on-load tap-changing transformer is collected; wherein the gear adjustment process data includes the output voltage, output current, input voltage and input current of the on-load tap-changing transformer; The gear shifting process data is uploaded to the on-load tap changer monitoring master station for use in status analysis of the on-load tap changer.

2. The on-line monitoring method for on-load tap changer according to claim 1, characterized in that: The monitoring of the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller includes: Acquiring a message communicated between the on-load tap changer monitoring master station and the on-load tap changer controller; Determining whether the message is a valid message according to the length and error check code of the message; When the message is a valid message, it is determined whether the message is a specific gear adjustment message; wherein the specific gear adjustment message is pre-set according to the type of the on-load tap changer.

3. The on-line monitoring method for on-load tap changer according to claim 1, characterized in that: Before the communication information between the on-load tap changer monitoring master station and the on-load tap changer controller is monitored, the method also includes initializing the delay, serial port, memory and communication protocol, and setting the delay time.

4. The on-line monitoring method for on-load tap changer according to claim 1, characterized in that: The delay duration is set according to the drive motor power and the spring design parameters.

5. The on-line monitoring method for on-load tap changer according to claim 1, characterized in that: Before collecting the gear adjustment process data of the on-load tap-changing transformer, the method also includes setting the sampling time, sampling frequency and sampling accuracy according to the specific gear adjustment message.

6. The on-line monitoring method for on-load tap changer according to claim 1, characterized in that: The uploading of the gear shifting process data to the on-load tap changer monitoring master station comprises: receiving a request from the on-load tap changer monitoring master station to read data preparation state variables; Sending data preparation status variables to the on-load tap changer monitoring master station; Receive the data collection frame instruction sent by the on-load tap changer monitoring master station, and upload the file adjustment process data frame by frame.

7. An on-line monitoring system for an on-load tap changer, characterized in that: The on-load tap changer online monitoring system comprises an on-load tap changer monitoring main station and an on-load tap changer monitoring substation. When the on-load tap changer monitoring substation is in operation, the on-load tap changer online monitoring method according to any one of claims 1 to 6 is executed.

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