Method for monitoring and distinguishing transformer and circuit in centralized control system

Abstract

The invention relates to a method for monitoring and distinguishing a transformer and a line in a centralized control system, which comprises the following steps that a module for monitoring the transformer and the line is arranged in the centralized control system, the module can obtain the operation data of the transformer and the line, the load rate is calculated according to the formula that the load rate is equal to (actual load power / rated load power) * 100%, according to P = UIcosphi, U is voltage, I is current, and cosphi is a power factor; comparing and arranging the calculated load rate data from high to low; performing color distinguishing display on the load rate data according to a set threshold value, displaying in yellow when the load rate reaches 80%, and displaying in red when the load rate reaches 90% or more; reporting the line data displayed in yellow to a dispatcher; and carrying out intelligent inspection on the overload equipment which is displayed in red. And through automatic load rate calculation, sorting and color distinguishing display, the monitoring personnel do not need to manually calculate and check one by one, so that the workload is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power equipment, and in particular relates to a method for monitoring and distinguishing transformers and lines in a centralized control system. Background Art

[0002] Among the many substations and lines managed by power companies, the overload conditions of each substation vary significantly. The traditional monitoring method relies on monitoring personnel to manually monitor the transformers and lines of each substation and calculate relevant data (such as load rate). This method faces serious problems such as huge workload and long time consumption. As the scale of the power grid continues to expand, an efficient and intelligent monitoring method is urgently needed to reduce the burden on monitoring personnel, provide accurate and effective data for dispatchers to optimize the power grid, and improve the reliability of power supply to the power grid. Summary of the invention

[0003] In order to solve the technical problem in the background technology, the present invention provides a method for monitoring and distinguishing transformers and lines in a centralized control system, comprising the following steps: S1, function setting of a monitoring module; A module dedicated to monitoring transformers and lines is built in the centralized control system. This module has the ability to automatically collect transformer and line operation data (including but not limited to current, voltage and other parameters), and then calculate the load rate based on a specific algorithm formula.

[0004] Load factor calculation algorithm formula First, calculate the actual load power according to the power calculation formula P=UIcosφ (where U is voltage, I is current, and cosφ is power factor).

[0005] Then, calculate the load factor using the formula load factor = (actual load power / rated load power) x 100%, where the rated load power is the design rating of the transformer or line.

[0006] S2. Data processing and display sorting algorithm: The calculated load rate data is sorted from high to low using a sorting algorithm (such as a quick sorting algorithm). The basic idea of ​​the quick sorting algorithm is to divide the records to be sorted into two independent parts through a sorting process, where the keywords of one part of the records are smaller than the keywords of the other part of the records, and then continue to sort the two parts of the records separately to achieve an orderly sequence. The specific steps are as follows: Select a base element, usually the first element or the last element.

[0007] Through one scan, the array to be sorted is divided into two parts, one part is smaller than the benchmark element, and the other part is larger than the benchmark element.

[0008] Recursively quick sort these two parts until the entire sequence is in order.

[0009] S3. Color-coded display rules: The load rate data is displayed in different colors according to the set threshold. When the load rate reaches 80%, it is displayed in yellow, and when the load rate reaches 90% or above, it is displayed in red.

[0010] S4. The interactive module with the dispatcher can automatically filter out the yellow (high load rate) line data and report this data to the dispatcher according to the network communication protocol (such as IEC 61850). The dispatcher can carry out power grid optimization operations based on this data, such as adjusting load distribution and arranging equipment maintenance plans.

[0011] S5. The intelligent patrol function module has an intelligent patrol function. Once an overload device is detected (the load rate reaches the red display threshold), the intelligent patrol program is started. This program is linked with other monitoring devices (such as temperature sensors, fault indicators, etc.) to conduct a comprehensive inspection of the overload device according to the preset patrol path and detection items, obtain more equipment status information, and promptly discover potential fault hazards, thereby improving the reliability of power supply to the power grid.

[0012] The beneficial effects of the present invention are: Reduce the workload of monitoring personnel. Through automated load rate calculation, sorting and color-coded display, monitoring personnel no longer need to perform manual calculations and checks one by one. They can quickly locate equipment with abnormal load rates, greatly reducing their workload.

[0013] Providing effective data for dispatching Timely and accurate reporting of line data with high load rate (displayed in yellow) to dispatching will help dispatching personnel to optimize the load distribution of the power grid in a timely manner and improve the efficiency and reliability of power grid operation.

[0014] Intelligent patrol ensures power grid safety. The intelligent patrol function can promptly detect potential failures of overloaded equipment (load rate is displayed in red), reduce the probability of failure, and thus ensure safe and stable power supply to the power grid. DETAILED DESCRIPTION

[0015] A method for monitoring and distinguishing transformers and lines in a centralized control system. Data acquisition establishes a stable communication connection between the centralized control system and the transformer and line equipment of the substation to ensure that the voltage, current and other operating data of the equipment can be obtained in real time. Data transmission can be achieved by power line carrier communication or optical fiber communication.

[0016] For example, in the power line carrier communication mode, the power line is used as the signal transmission medium, and the data collected by the voltage and current sensors in the transformer and line equipment are modulated onto a high-frequency carrier signal, transmitted to the receiving end of the centralized control system through the power line, and then demodulated to restore the original data.

[0017] Load factor calculation and data processing According to the above load rate calculation formula, the load rate is calculated in real time in the monitoring module. Substitute the coefficient cos φ and the rated load power into the formula to calculate the actual load power and load factor.

[0018] The load rate data is sorted using a quick sorting algorithm. Specifically, during programming implementation, a recursive function can be used to implement the segmentation and recursive sorting process of the quick sorting algorithm.

[0019] According to the set color thresholds (80% and 90%), the data of different load rates are color-coded on the display interface. For example, in a monitoring system based on a graphical interface, a specific color coding function can be used to set the corresponding display element to the corresponding color when the load rate data meets the corresponding threshold conditions.

[0020] Communication with dispatchers and intelligent patrol The line data with high load rate (displayed in yellow) is sent to the dispatch center through the IEC 61850 network communication protocol. In actual implementation, according to the provisions of the IEC 61850 protocol, the data to be sent is encapsulated and encoded to ensure that the data can be accurately transmitted to the receiving end of the dispatch center.

[0021] In terms of intelligent inspection, when an overloaded device is detected (the load rate is displayed in red), the inspection program is started. The inspection program conducts a comprehensive inspection of the equipment according to the preset inspection path and inspection items. For example, the preset inspection path can start from the incoming line end of the equipment and check each key component of the equipment in turn (such as the winding, core, cooling system of the transformer, insulators of the line, wire connection points, etc.). The inspection items include temperature detection, insulation detection, etc. The inspection results are recorded and stored in the local database or remote server for subsequent analysis.

[0022] The following methods are also included Data collection.

[0023] In addition to collecting voltage and current data to calculate the load rate, multi-source data fusion also collects data such as transformer oil temperature, oil level, and ambient temperature and humidity of the line. These data are transmitted to the centralized control system through the sensor network. For example, oil temperature sensors and oil level sensors are installed on the transformer, and temperature and humidity sensors are installed around the line.

[0024] Multi-source data fusion.

[0025] In addition to collecting voltage and current data to calculate the load rate, the data of transformer oil temperature, oil level, and line ambient temperature and humidity are collected. These data are transmitted to the centralized control system through the sensor network. For example, oil temperature sensors and oil level sensors are installed on the transformer, and temperature and humidity sensors are installed around the line.

[0026] Algorithm improvement: When calculating the load rate, consider the impact of environmental factors on the equipment. Establish a comprehensive risk assessment model, such as a comprehensive risk index R = a × load rate + b × oil temperature deviation + c × oil level deviation + d × ambient temperature impact + e × ambient humidity impact (where a, b, c, d, and e are weight coefficients determined based on equipment characteristics and experience). When R exceeds a certain threshold, it is marked as high risk and the equipment needs to be monitored closely.

[0027] Adaptive adjustment of data acquisition frequency The data collection frequency is automatically adjusted according to the load conditions of the equipment and the fluctuation of historical data. For example, for transformers and lines with large load fluctuations or in a high load state, the data collection frequency is increased from the conventional collection every 10 minutes to every 2-3 minutes.

[0028] Algorithm: Set the load rate fluctuation threshold as △. If the load rate changes collected for n consecutive times exceed, the collection frequency will be increased to; if the load rate stabilizes at a low level for a period of time, the collection frequency will be reduced to f2 (f1>f2).

[0029] Load factor calculation and data processing.

[0030] Dynamic correction of load factor calculation.

[0031] Consider the impact of factors such as equipment aging on the rated load power and regularly revise the rated load power. For example, based on the equipment's operating years, maintenance records, etc., establish a rated load power correction function P*rated = Prated×(1-k×t) (where Pated is the initial rated load power, k is the aging factor determined by the equipment type, and t is the operating years), and then calculate the load rate = (actual load power / P*rated )x100%. Intelligent data processing.

[0032] In terms of data sorting, in addition to sorting by load rate from high to low, weighted sorting can also be performed based on factors such as the importance of the equipment and its geographical location. For example, a higher weight is given to equipment located in a core power supply area or supplying power to important users, making it higher in the sorting.

[0033] Algorithm: Assume that the load rate of device i is Li, the importance weight is wi, and the geographical location weight is gi, then the comprehensive ranking index is Si = α× Li+β×wi+γ×gi (where a, β, γ are coefficients determined according to demand), and the systems are sorted according to the value of Si.

[0034] Display and alarm.

[0035] In addition to the color-coded display of the load rate, other equipment status information is also displayed. For example, when the transformer oil temperature is too high, in addition to the load rate color mark, the display interface also flashes the oil temperature alarm icon.

[0036] The line displays its real-time ambient temperature and humidity data as well as possible external interference (such as nearby construction, etc.).

[0037] In addition to setting yellow (80%) and red (90%) alarms according to the load rate, the hierarchical alarm strategy adds more levels of alarms. For example, when the load rate reaches 70%, a minor alarm is sent to notify the monitoring personnel to pay attention; when the load rate reaches between 80% and 90%, in addition to the color display being yellow, an intermediate alarm is also sent to the dispatch center; when the load rate reaches more than 90%, a high-level alarm is sent, and the emergency response plan suggestion function is activated at the same time.

[0038] Smart patrol.

[0039] Intelligent patrol route optimization.

[0040] Optimize intelligent inspection paths based on the real-time status and historical fault data of the equipment. For example, if the oil temperature of the transformer is too high and the load rate is high, priority will be given to inspecting heat dissipation-related components such as radiators and cooling fans.

[0041] Algorithm: Assume that the equipment has n components, the failure probability of each component is Pj (obtained from historical failure data statistics), the impact factor of the current equipment status on component j is Ij (obtained from equipment status analysis), then the inspection priority of the component Qj=wxP+(1-w)xIj (w is the weight coefficient), and the inspection path is determined from high to low according to Qj.

[0042] Real-time feedback and analysis of intelligent patrol results.

[0043] During the intelligent inspection process, the inspection results are fed back to the centralized control system in real time, and the centralized control system analyzes the inspection results in real time. For example, when the temperature of a certain component of the transformer is found to be abnormally high, it is immediately compared with historical data to analyze whether the rate of temperature increase is abnormal. If it is abnormal, the equipment operation strategy is adjusted in time or a higher level alarm is issued.

Claims

1. A method for monitoring and distinguishing transformers and lines by a centralized control system, characterized in that: The method comprises the following steps: setting a module for monitoring transformers and lines in a centralized control system, wherein the module can obtain operation data of the transformers and lines, and calculating the load rate according to the formula load rate = (actual load power / rated load power) x 100%, wherein the actual load power is calculated according to P = UIcosφ, where U is voltage, I is current, and cosφ is power factor; Arrange the calculated load rate data from high to low; The load rate data is displayed in different colors according to the set threshold. When the load rate reaches 80%, it is displayed in yellow, and when the load rate reaches 90% or above, it is displayed in red. Report the line data displayed in yellow to the dispatcher; Conduct intelligent inspections on overloaded equipment displayed in red.

2. The method according to claim 1, characterized in that: The module obtains the operation data of the transformer and the line through power line carrier communication or optical fiber communication.

3. The method according to claim 1, characterized in that: The module uses a quick sorting algorithm to compare and arrange the load rate data from high to low.

4. The method according to claim 1, characterized in that: The module reports the line data displayed in yellow to the dispatcher via the IEC 61850 network communication protocol.

5. The method according to claim 1, characterized in that: The intelligent inspection performs a comprehensive inspection of overloaded equipment according to preset inspection paths and detection items.