Monitoring-based electromechanical service management system
Through the combination of the microcomputer monitoring module and the fault service management module, combined with differential protection and other functions, the comprehensive problem of electromechanical system monitoring and management is solved, the effective identification and handling of faults is achieved, and the stability and reliability of the system are improved.
Patent Information
- Application Number
- CN202510492087.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2025-07-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the monitoring and management of electromechanical systems lack comprehensiveness, making it difficult to effectively identify and deal with faults, and the system stability and reliability are insufficient.
The microcomputer monitoring module, basic service management module and fault service management module are adopted, combined with differential protection, bus connection dead zone fault protection, bus connection failure protection, bus connection charging protection and other functions, fault circuits are determined by constructing sequences, and data processing is performed using gas chromatography analysis and power supply data to achieve comprehensive monitoring and management of the system.
It realizes comprehensive monitoring and management of electromechanical systems, can effectively identify and handle faults, and improves the stability and reliability of the system.
Smart Images
Figure CN120301039A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power monitoring management and maintenance, and particularly to an electromechanical service management system based on monitoring. Background Art
[0002] Online monitoring of the operating status of the electromechanical system and operation control of remote devices are achieved through data acquisition and supervisory control. Monitoring refers to the acquisition, processing, display, alarm, and printing of the operating information of the electromechanical system, as well as the automatic identification of abnormalities or accidents in the electromechanical system. Control mainly refers to the open-loop control of remotely operating devices such as circuit breakers, disconnectors, and static capacitor banks through man-machine connection tools.
[0003] Dispatchers can use man-machine connection tools to execute the daily operation plan of the electromechanical system, maintain the quality of frequency and central point voltage, take preventive measures to eliminate unsafe factors, analyze faults, handle accidents, and restore the normal operation of the electromechanical system. Summary of the Invention
[0004] To solve the defects and deficiencies existing in the above-mentioned prior art, an electromechanical service management system based on monitoring of the present invention includes: a microcomputer monitoring module, a basic service management module, and a fault service management module, wherein.
[0005] The microcomputer monitoring module is used for: automatically monitoring according to the terminal voltage value of the battery pack, the AC voltage value of the charging device, and the output voltage and current value data. The basic service management module is used for: (1) bus protection; (2) workstation service. The fault service management module is used for: Determining the fault loop based on the construction sequence.
[0006] Preferably, the bus protection includes: a. differential protection; b. dead zone fault protection of the bus coupler; c. bus coupler malfunction protection; d. bus coupler charging protection; e. current transformer open-circuit locking and alarm; f. voltage locking element management. Preferably, the differential protection is provided with a large differential and small differentials for each section of the bus. The large differential serves as the starting element for the small differentials to distinguish between internal and external faults of the bus, and the small differential serves as the selection element for the faulty bus. The differential protection operates to trip all the elements connected to a section of the bus and the bus coupler breaker. Preferably, for the dead zone fault protection of the bus coupler, a current transformer is installed on one side of the bus coupler breaker. If a fault occurs between the current transformer and the switch, when the bus differential protection determines it as an internal fault, the bus coupler breaker and all the elements on that section of the bus will be instantaneously tripped. Preferably, for the bus coupler malfunction protection, when a fault occurs on the bus and the bus coupler breaker refuses to operate when the bus coupler is tripped and the fault point is not removed, at this time the large differential operates and the bus coupler current exceeds the limit, and after a time delay, all the elements on the double bus are tripped to finally remove the fault. Preferably, for the bus coupler charging protection, when any group of buses is overhauled and then put into operation, the charging protection is put into operation when the bus coupler breaker is used to charge the bus. When there is a fault on the bus, the charging protection is used to remove the fault. Preferably, determining the fault loop based on the constructed sequence includes: (1) constructing an initial first sequence and a second sequence; (2) data normalization processing; (3) calculation of the correlation coefficient; (4) correlation calculation; (5) comparing the correlations. A monitoring-based electromechanical service management system according to the present invention displays both the obtained system operation parameters and operation states on the display screen. The operation personnel can perform operation parameter setting and modification through the keyboard, buttons or touch screen of the microcomputer to achieve comprehensive monitoring and management of the system. At the same time, the system of the present invention can not only achieve comprehensive monitoring and management of electromechanical services, but also provide various methods of bus control and workstation service management, and can also effectively identify and handle faults in the system. The function of determining the fault loop based on the constructed sequence improves the stability and reliability of the system. Description of the Drawings
[0007] Figure 1 It is a structural diagram of a monitoring-based electromechanical service management system according to the present invention. Detailed Embodiments
[0008] As Figure 1 shown, a monitoring-based electromechanical service management system according to the present invention includes: a microcomputer monitoring module, a basic service management module and a fault service management module.
[0009] The microcomputer monitoring module is used for: automatically monitoring according to the terminal voltage value of the battery pack, the AC voltage value of the charging device, and the output voltage and current value data. The operator can set and modify the operation parameters through the keyboard, buttons or touch screen of the microcomputer. The system operation parameters and operation status obtained by the microcomputer monitoring module are all displayed on the display screen. The functions of the microcomputer monitoring module include: (1) Diagnosis management: diagnosing the faults and abnormal operation states of the internal circuits of the power supply, and capable of giving out audible and visual alarms; real-time displaying various information of each unit device, including the collected data and the set data, and the operation situation of the entire system and the fault information that has occurred can be viewed. (2) Setting management: setting and modifying the system parameters and operation parameters, and allowing or stopping the operation through an encryption method. (3) Control management: making judgments and sending out control commands through the analysis and processing of the collected data. The control methods are divided into two types: remote and local. The user can set the control method through the operation keys on the display screen. (4) Alarm management: alarming for system faults, battery fuse fusing, unit device faults, insulation faults, abnormal bus voltage (undervoltage or overvoltage), AC power supply faults, battery faults, and feeder switch tripping. Each alarm has two pairs of relay passive dry contacts, which are used as remote signaling passive contact outputs or are connected to remote signaling outputs through a serial interface. (5) Power supply management: controlling the on / off of each power supply, reading the output voltage and current data of the power supply and its working and fault states, controlling the floating charge and equalizing charge working states, and displaying the output voltage and current output of the power supply control unit, and performing unified control or grouped control of the power supply. (6) Communication management: sending the collected real-time data and alarm information to the centralized control center through a router, telephone network or integrated automation system. The centralized control center performs remote measurement, remote signaling and remote control according to the received information. (7) Battery management: detecting the state of the battery pack and individual batteries in real time, and performing floating charge and equalizing charge conversion according to the detection results; performing charging current limiting, temperature compensation of the charging voltage and timed supplementary charging. (8) Monitoring management: monitoring the three-phase AC input voltage value and whether there is a phase loss or power failure, monitoring whether the bus voltage value is normal, monitoring whether the battery fuse is fused and whether the charging current is normal, etc. (9) Remote control management: triggering the remote control, remote measurement and remote signaling control of the centralized control center by sending the collected data to the remote control interface of the centralized control center, and displaying the operation mode and fault category of the power supply panel. The basic service management module is used for: (1) Bus protection, including: a. Differential protection: The differential protection sets the large differential and the small differentials of each section of the bus. The large differential is used as the starting element of the small differential to distinguish between internal and external bus faults. The small differential is used as the selection element for the faulty bus. When the differential protection operates, all the elements connected to a section of the bus and the bus coupler breaker are tripped. b. Dead zone fault protection of the bus coupler: Install a current transformer on one side of the bus coupler breaker. If a fault occurs between the current transformer and the switch, when the bus differential protection judges it as an internal fault, the bus coupler breaker and all the elements on that section of the bus will be instantaneously tripped.At this time, there is still current in the bus coupler. For the other bus, there is still a fault on the bus. The differential protection of the other bus operates quickly to cut off the components connected to the bus. c. Bus coupler failure protection: When a bus fault occurs and the bus coupler breaker refuses to operate when cutting the bus coupler, the fault point is not removed. At this time, the large differential operates and the bus coupler current exceeds the limit, and all components on the double bus are tripped after a time delay (this time should avoid the tripping time of the bus coupler breaker), and finally the fault is removed. d. Bus coupler charging protection: When any group of buses is overhauled and then put into operation, the charging protection is put into operation when using the bus coupler breaker to charge the bus. When there is a fault on the bus, the charging protection is used to cut off the fault. e. Current transformer open-circuit locking and alarm: When the system is operating normally, the large differential and each section of the small cover are zero. When the differential current continuously exceeds the limit, it is judged that the current transformer is open-circuited, the bus differential protection of the open-circuited phase is locked and an alarm signal is sent. f. Voltage locking element management: The voltage locking elements include low-voltage elements of each phase of the bus, negative-sequence voltage elements, and zero-sequence voltage elements. When the voltage transformer is open-circuited, the low-voltage element and the negative-sequence voltage element of the open-circuited phase are withdrawn. (2) Workstation services, including: 1) System workstation service, responsible for the coordination and management of the entire system, maintaining the latest complete backup of the real-time database; responsible for organizing historical data and storing it in the historical database server. When a system workstation fails, the main and standby machines will be automatically switched, and the switching time is less than 30s. The main and standby machines can also be switched manually. 2) Operator workstation service, providing an artificial interaction function entry for the operator to monitor and operate the mechanical and electrical equipment in real time, displaying graphics, data, tables, alarm information, and management information; providing a remote control and remote adjustment operation interface. 3) Front-end communication workstation service, responsible for receiving real-time data from power plants or users, performing protocol conversion and preprocessing, broadcasting it to the background machine system through the network, and at the same time sending control commands to each power plant. Collect analog quantities, digital quantities, status quantities, and protection information of remote terminals and negative control terminals. Control the setting and modification of remote control, remote adjustment, protection setting values, and negative control terminal parameters. Two front-end communication workstations work in a hot standby state with each other. When one of the workstations fails, the switch will be automatically made. The fault service management module is used for:. Determine the fault loop based on the construction sequence: (1) Construct the initial first sequence and second sequence. Use the gas composition in the gas chromatographic analysis data of the oil in the device as the first sequence X0, that is: X0 = {X0(1), X0(2), …, X0(k), …, X0(n)}, (k = 1, 2, …, n) n is the number of elements in the sequence, where X0(k) is the content of the kth chromatographic analysis gas, and K >= 3.
[0010] Data source: The results of gas chromatographic analysis of dissolved gases in the oil of mechanical and electrical equipment (such as transformers), including the concentrations of gases such as C2H2, C2H4, CH4, H2, C2H6, CO, and CO2 (unit: ppm).
[0011] Sampling frequency: once every 24 hours, continuously sample K times (K≥3).
[0012] Use the average values of the device power supply voltage and current to form the second sequence Xj, that is: Xj={Xj(l),Xj⑵,…,Xj(k),…,Xj(n)},(k=1,2,…,n) In the formula, Xj(k) is the average power supply voltage and current corresponding to chromatographic analysis, j = 1, 2. Among them, X1(k) is the average power supply voltage, and X2(k) is the average power supply current.
[0013] Data source: Power supply voltage and current data (unit: V, A) collected synchronously with chromatographic analysis.
[0014] Sampling frequency: Real-time collection through the microcomputer monitoring module, sampling frequency ≥ 1 time / minute.
[0015] (2) Data normalization processing. After the sequence is processed according to the following formula, the new sequences Y0(k) and Yj(k) are obtained: Y0(k)=X0(k) / X0(1) Yj(k)=Xj(k) / Xj(1) In the analysis, in order to facilitate the analysis and ensure the equivalence of each factor, data normalization processing is required to avoid errors caused by different units.
[0016] (3) Calculation of the correlation coefficient. The definition of the correlation coefficient is:
[0017] This formula represents the correlation coefficient between the first sequence and the second sequence, where, D0j(k)=|Y0(k)-Yj(k)|,(k=1,2,…,n) Is the absolute difference between the first sequence Y0(k) and the second sequence Yj(k) at the kth element.
[0018] Dmin is the minimum value in D0j(k), Dmax is the maximum value in D0j(k), a is the adjustment coefficient, 1 <= a <= 3, default value a = 2 (based on experimental verification, to balance sensitivity and anti-interference).
[0019] (4) Calculation of the correlation degree:
[0020] Output: Voltage correlation degree R01, current correlation degree R02.
[0021] Compare the relevance, compare the magnitudes of the voltage and current corresponding to R0j, and determine the factor with a higher relevance as the faulty circuit.
[0022] A high voltage relevance indicates abnormal magnetic circuit loss, and a high current relevance indicates abnormal circuit loss. If R01 > R02, it is determined that the faulty circuit is related to the voltage; otherwise, it is related to the current.
[0023] Specifically, set the threshold Rth = 0.6. If R01 > R02 and R01 > Rth, it is determined that the voltage is the main cause; if R02 > R01 and R02 > Rth, it is determined that the current is the main cause; otherwise, it is regarded as a normal operating condition or requires manual review.
[0024] Among them, the energy loss on the circuit is proportional to the square of the current, and the energy loss on the magnetic circuit is proportional to the square of the voltage.
[0025] The device can be a transformer of an electromechanical system. The gas can be a hydrocarbon, including C2H2, C2H4, CH4, H2, C2H6, CO, CO2, etc.
[0026] Among them, the above-mentioned microcomputer monitoring module, basic service management module, and fault service management module realize the module functions through corresponding processes and threads. The modules are connected logically or electrically, and the specific functions of each module can be implemented by a physical processor executing the program code stored in the memory.
[0027] A monitoring-based electromechanical service management system of the present invention displays the obtained system operation parameters and operation status on a display screen. The operator can perform operation parameter setting and modification through the keyboard, buttons, or touch screen of the microcomputer to achieve comprehensive monitoring and management of the system. At the same time, the system of the present invention can not only achieve comprehensive monitoring and management of electromechanical services, but also provide various ways of bus control and workstation service management. At the same time, it can also effectively identify and handle faults in the system, and determine the faulty circuit based on the constructed sequence, improving the stability and reliability of the system. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those of ordinary skill in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to what is defined by the previous claims.
Claims
1. An electromechanical service management system based on monitoring, characterized in that, It includes: a microcomputer monitoring module, a basic service management module, and a fault service management module. Among them, the microcomputer monitoring module is used to automatically monitor according to the terminal voltage value of the battery pack, the AC voltage value of the charging device, and the output voltage and current value data; the basic service management module is used for: (1) bus protection; (2) workstation service; the fault service management module is used to determine the fault loop based on the construction sequence.
2. The system according to claim 1, characterized in that The bus protection includes: a. differential protection; b. dead zone fault protection of the bus coupler; c. bus coupler malfunction protection; d. bus coupler charging protection; e. current transformer disconnection locking and alarm; f. voltage locking element management.
3. The system according to claim 2, wherein The differential protection sets the large differential and the small differentials of each section of the bus. The large differential is used as the starting element of the small differential to distinguish between internal and external bus faults, and the small differential is used as the selection element for the faulty bus; when the differential protection operates, it cuts off all the elements connected to a section of the bus and the bus coupler breaker.
4. The system according to claim 2, wherein For the dead zone fault protection of the bus coupler, a current transformer is installed on one side of the bus coupler breaker. If a fault occurs between the current transformer and the switch, when the bus differential protection judges it as an internal fault, the bus coupler breaker and all the elements on that section of the bus will be instantaneously tripped.
5. The system according to claim 2, wherein For the bus coupler malfunction protection, when a bus fault occurs and the bus coupler breaker refuses to operate when cutting the bus coupler, the fault point is not removed. At this time, the large differential operates and the bus coupler current exceeds the limit, and after a time delay, all the elements on the double buses are tripped to finally remove the fault.
6. The system according to claim 2, wherein For the bus coupler charging protection, when any group of buses is overhauled and then put into operation, the charging protection is put into operation when using the bus coupler breaker to charge the bus. When there is a fault on the bus, the charging protection is used to remove the fault.
7. The system according to claim 1, wherein The determination of the fault loop based on the construction sequence includes: (1) Construct the initial first sequence and the second sequence; (2) Data normalization processing; (3) Calculation of the correlation coefficient; (4) Calculation of the correlation degree; (5) Comparison of the correlation degrees.