Substation load test system and method

Abstract

The present invention discloses a substation load test system and method, and relates to the technical field of power system operation and maintenance, wherein the test system comprises: a data acquisition module, which is used to obtain the power data of each interval to be tested in the substation, wherein the power data at least includes: the primary load data of the interval to be tested, the primary flow data, the current data of each winding of the current transformer, and the secondary voltage data of the busbar voltage transformer; a data analysis module, which is used to draw a hexagonal diagram based on the power data, and analyze the wiring conditions of the interval to be tested based on the hexagonal diagram, obtain the analysis results, and generate a substation load test report based on the analysis results; a data display module, which is used to display the substation load test report. The present invention solves the technical problem in the related art that when the substation is tested on load, the substation is tested and analyzed by manually drawing a hexagonal diagram through the collected data, and the test efficiency is low.

Description

Technical Field

[0001] The present invention relates to the technical field of power system operation and maintenance, and in particular to a substation load testing system and method. Background Art

[0002] Substations are key equipment in the power system, responsible for receiving, distributing and controlling electric energy. At present, with the increasing number of new substations and technical transformation projects, load testing is an indispensable task in the process of equipment power transmission. Load testing can help staff determine the correctness of the secondary circuit, and its accuracy affects whether the protection device can operate normally and the measurement accuracy of the metering device.

[0003] In the related art, when the substation is tested under load, the staff needs to carry instruments, connecting wires and other equipment, record data manually, draw hexagonal diagrams and analyze the hexagonal diagrams, and finally output the test report to determine whether there are abnormal conditions in the substation. The operation process is cumbersome and has the following problems: the data recording and calculation process depends on the subjective judgment of the staff, which is prone to misoperation and human errors. The data recording method is backward, and the data is recorded using paper and pen. The data is not easy to save, and it is difficult to organize and analyze the data. The report output is not standardized, and the format and content of the test report are not unified, which is not conducive to the communication and learning of technical personnel. The carrying and use management of instruments and connecting wires are cumbersome, which increases the burden of on-site testing and reduces the test efficiency. The lack of automatic judgment and analysis of test results makes it easy to ignore the correctness of the test results.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiment of the present invention provides a substation load test system and method to at least solve the technical problem in the related art that when the substation is subjected to load test, the substation is tested and analyzed by manually drawing a hexagonal diagram through the collected data, resulting in low test efficiency.

[0006] According to one aspect of an embodiment of the present invention, there is provided a substation load test system, which is applied to a portable substation load tester, and includes: a data acquisition module, which is used to acquire power data of each interval to be tested in the substation, wherein the interval to be tested is a unit to be tested composed of power equipment in the substation, and the power data includes at least: primary load data of the interval to be tested, primary flow data of the interval to be tested, current data of each winding of the current transformer in the interval to be tested, and secondary voltage data of the bus voltage transformer of the substation; a data analysis module, which is used to draw a hexagonal diagram based on the power data, and analyze the wiring conditions of the interval to be tested based on the hexagonal diagram to obtain analysis results, and generate a substation load test report based on the analysis results; a data display module, which is used to display the substation load test report.

[0007] Optionally, the data analysis module draws a hexagonal diagram based on the power data, including: taking the phase of the A-phase voltage in the secondary voltage data of the bus voltage transformer as the reference phase; obtaining the current amplitude and current phase of each phase current in the current data of each winding of the current transformer; and drawing a hexagonal diagram of each winding based on the reference phase, the current amplitude and current phase of each phase current of each winding.

[0008] Optionally, the data analysis module analyzes the wiring condition of the interval to be tested based on the hexagonal diagram to obtain an analysis result, and generates a substation load test report based on the analysis result, including: performing a differential current check on the current loop corresponding to the winding based on the current amplitude of each phase in the hexagonal diagram to obtain a differential current check result; performing a phase check on each phase of the same winding based on the phase difference of each phase and the arrangement order of each phase in the hexagonal diagram to obtain a phase check result; performing a quadrant check on the active power and reactive power of the interval to be tested based on the hexagonal diagram to obtain a quadrant check result; calculating the active power of the interval to be tested based on the hexagonal diagram, and comparing the active power of the interval to be tested with the active power on the opposite side of the interval to be tested to obtain an active power balance check result; generating the substation load test report based on the differential current check result, the phase check result, the quadrant check result and the active power balance check result.

[0009] Optionally, the substation load test system further includes: a data printing module, configured to receive a printing instruction from the data display module and print the substation load test report.

[0010] Optionally, the data acquisition module includes two-way input current submodules and two-way input voltage submodules, and the data acquisition module collects data on two current loops through the two-way input current submodules and the two-way input voltage submodules.

[0011] Optionally, the data display module adopts an LED touch screen, which is used to provide an editable interface to the user, and receive input substation information through the editable interface, wherein the substation information at least includes: the substation identification of the interval to be tested, the current loop number of the interval to be tested, the function of the winding corresponding to the current loop of the interval to be tested, the transformation ratio of each winding, and the wiring method of the current loop of the interval to be tested.

[0012] Optionally, the data acquisition module determines the current loop number to be measured, and measures each winding of the current transformer corresponding to the current loop based on the current loop number to obtain current amplitude data and phase data of each winding, and obtains current data of each winding of the current transformer based on the current amplitude data and the phase data of each winding.

[0013] Optionally, the data analysis module calculates a power factor angle corresponding to the primary power flow data based on the primary power flow data, and updates the substation load test report based on the power factor angle, wherein the power factor angle is used to evaluate the power quality of the interval to be tested.

[0014] According to another aspect of an embodiment of the present invention, a method for load testing a substation is also provided, comprising: obtaining power data of each interval to be tested in the substation, wherein the power data at least includes: primary load data, primary flow data, current data of each winding of the current transformer, and secondary voltage data of the substation bus voltage transformer of the interval to be tested; drawing a hexagonal diagram based on the power data, and analyzing the wiring conditions of the interval to be tested based on the hexagonal diagram to obtain analysis results, and generating a substation load test report based on the analysis results.

[0015] Optionally, the steps of analyzing the wiring condition of the interval to be tested based on the hexagonal diagram to obtain analysis results, and generating a substation load test report based on the analysis results include: performing a differential current check on the current loop corresponding to the winding based on the current amplitude of each phase in the hexagonal diagram to obtain a differential current check result; performing a phase check on each phase of the same winding based on the phase difference of each phase and the arrangement order of each phase in the hexagonal diagram to obtain a phase check result; performing a quadrant check on the active power and reactive power of the interval to be tested based on the hexagonal diagram to obtain a quadrant check result; calculating the active power of the interval to be tested based on the hexagonal diagram, and comparing the active power of the interval to be tested with the active power on the opposite side of the interval to be tested to obtain an active power balance check result; generating the substation load test report based on the differential current check result, the phase check result, the quadrant check result and the active power balance check result.

[0016] In the present application, the substation load test system obtains the power data of each interval to be tested in the substation through a data acquisition module, wherein the power data at least includes: primary load data, primary flow data, current data of each winding of the current transformer and secondary voltage data of the bus voltage transformer of the interval to be tested, and draws a hexagonal diagram based on the power data through the data analysis module, and analyzes the wiring conditions of the interval to be tested based on the hexagonal diagram to obtain the analysis results, and generates a substation load test report based on the analysis results, and finally displays the substation load test report through the data display module.

[0017] In the present application, a substation load test system is proposed, which is applied to a portable substation load tester. The real-time power data of each interval to be tested in the substation can be directly obtained, and a hexagonal diagram can be drawn according to the power data. The substation is tested and analyzed through the hexagonal diagram, and a substation load test report is automatically generated. The test report is displayed through a data display module, thereby realizing the automation of substation load testing, improving the efficiency of hexagonal diagram drawing, thereby improving the testing efficiency of the substation, and ensuring that the substation can be put into use quickly, thereby solving the technical problem in the related technology that when the substation is tested on load, the hexagonal diagram is manually drawn by the collected data to test and analyze the substation, resulting in low testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a schematic diagram of an optional substation load test system according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of an optional hexagonal diagram according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of an analysis flow of an optional data analysis module according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of an optional substation load tester according to an embodiment of the present invention;

[0023] Figure 5 The present invention is a flowchart of an optional substation load testing method according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Data acquisition module 101, data analysis module 102, data display module 103;

[0026] Two-way input current module 401, two-way input voltage module 402, USB module 403, power interface 404;

[0027] LED touch screen 405, printing module 406. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] It should be noted that the substation load testing system and method in the present application can be used in the field of power system operation and maintenance technology when the substation is subjected to load testing, and can also be used in any field other than the field of power system operation and maintenance technology when the substation is subjected to load testing. The present application does not limit the application field of the substation load testing system and method.

[0031] The following embodiments of the present invention can be applied to various systems / applications / equipment for load testing of substations. The present invention proposes a system for load testing of substations, which includes a data acquisition module, a data analysis module, a data display module, a storage module and a data printing module to achieve the purpose of quickly and accurately measuring hexagonal diagrams. The data acquisition module includes acquiring voltage data, current data, etc.; the data processing module can automatically draw a hexagonal diagram based on a template and real-time data, and determine the correctness of the hexagonal diagram; the data display module uses an LED touch screen, which can edit substation information and current loop number, purpose, current transformer ratio, etc. The data storage module stores the generated electronic version of the hexagonal diagram and supports the printing function. The entire system does not require communication equipment, only internal system processing and the cooperation of construction personnel, which can greatly improve the efficiency of measuring hexagonal diagrams, ensure on-time power supply, and the display interface has a high degree of visualization and high accuracy of calculation results, which provides convenience for subsequent work.

[0032] The present invention is described in detail below in conjunction with various embodiments.

[0033] Embodiment 1

[0034] The embodiment of the present invention provides a substation load test system, which is applied to a portable substation load tester. Figure 1 is a schematic diagram of an optional substation load test system according to an embodiment of the present invention, such as Figure 1 As shown, the substation load test system includes:

[0035] The data acquisition module 101 is used to acquire the power data of each test bay in the substation.

[0036] It should be noted that the substation tested in the embodiment of the present invention refers to a newly put into use substation or a substation to be put into use after comprehensive transformation. The test interval of the substation refers to a test unit composed of the substation power equipment. In the substation, multiple intervals in the substation can be obtained according to multiple components such as the incoming line, main transformer high voltage, main transformer low voltage, main transformer, low voltage outlet line, etc. The substation needs to be tested with load before it is officially put into use to simulate the working status under the actual use scenario, so as to verify the performance of the substation equipment and the correctness of the secondary circuit, and ensure that the substation can be put into use normally.

[0037] The embodiment of the present invention obtains power data through the data acquisition module 101, and the power data at least includes: primary load data of the interval to be tested, specifically three-phase current and three-phase voltage data of the interval to be tested, primary flow data, specifically including measured active power, measured reactive power and power factor data of the interval to be tested, current data of each winding of the current transformer and secondary A-phase voltage data of the bus voltage transformer of the substation, and the secondary A-phase voltage data refers to the A-phase voltage data on the low-voltage side of the bus voltage transformer.

[0038] Optionally, the data acquisition module includes two-way input current submodules and two-way input voltage submodules, and the data acquisition module collects data on the two current loops through the two-way input current submodules and the two-way input voltage submodules.

[0039] It should be noted that the data acquisition module 101 is composed of a two-way input current submodule and a two-way input voltage submodule, and can collect data for two windings at the same time. The collected data includes current data and voltage data. The two-way input current submodule is equipped with two independent current input channels, which can simultaneously receive current signals from different windings or current loops of the substation. This means that construction personnel can measure the current of the two windings at the same time, without having to reset the system after measuring one winding and then measure the other winding, thereby greatly saving time and improving work efficiency. Similarly, similar to the two-way current submodule, the two-way input voltage submodule also provides two independent input channels for measuring two voltage data at the same time, which can save work time and improve work efficiency. Optionally, the data acquisition module determines the current loop number to be measured, and measures the winding corresponding to the current loop based on the current loop number to obtain the current amplitude data and phase data of the winding, and obtains the current data of the substation based on the current amplitude data and phase data of each winding.

[0040] Optionally, the data acquisition module determines the current loop number to be measured, and measures each winding of the current transformer corresponding to the current loop based on the current loop number to obtain current amplitude data and phase data of each winding, and obtains current data of each winding of the current transformer based on the current amplitude data and the phase data of each winding.

[0041] It should be noted that the embodiment of the present invention collects data of each current loop through the data acquisition module 101. First, the current loop number to be measured is determined. The current loop number is used to distinguish different current loops. Then, the current data of each phase of the winding corresponding to the current loop number is clamped through the data acquisition module 101. The current data includes the current amplitude data and phase data of each winding of the current transformer. Three phases can be measured simultaneously or single phase can be measured. The acquired current amplitude data and phase data will be automatically filled in the corresponding position in the table until the winding test is completed, and the current data of the next winding is collected.

[0042] The data analysis module 102 is used to draw a hexagonal diagram based on the power data, analyze the wiring conditions of the test interval based on the hexagonal diagram, obtain analysis results, and generate a substation load test report based on the analysis results.

[0043] The embodiment of the present invention can automatically draw a hexagonal diagram through the data analysis module. The hexagonal diagram refers to drawing the phase relationship between each measured quantity and the selected reference quantity on the vector diagram, and then judging whether there is any wiring abnormality in the current loop, thereby obtaining the analysis result, and generating a substation load test report based on the analysis result.

[0044] Optionally, the data analysis module draws a hexagonal diagram based on the power data, including: taking the phase of the A-phase voltage in the secondary voltage data of the bus voltage transformer as the reference phase; obtaining the current amplitude and current phase of each phase current in the current data of each winding of the current transformer; and drawing a hexagonal diagram of each winding based on the reference phase, the current amplitude and current phase of each phase current of each winding.

[0045] It should be noted that when drawing a hexagonal diagram, it is first necessary to select a reference phase. The embodiment of the present invention uses the phase of the secondary A-phase voltage of the bus voltage transformer as the reference phase, and uses this as a reference to draw the hexagonal diagram. On the hexagonal diagram, the reference phase should be located in the positive direction of the Y-axis of the coordinate axis, and then the amplitude and phase of each phase current measured are drawn on the hexagonal diagram in the form of vectors. Generally speaking, the phase vectors should be evenly distributed to form a pattern that approximates a hexagon, in which the standard phase difference between the phases should be 120 degrees (for a three-phase system).

[0046] Figure 2 is a schematic diagram of an optional hexagonal diagram according to an embodiment of the present invention, such as Figure 2 As shown, UA is the secondary A-phase voltage of the bus voltage transformer, the phase corresponding to UA is the reference phase, IA, IB, and IC are arranged in a 120-degree positive sequence with UA as the reference, IA is the winding A-phase current, IB is the winding B-phase current, IC is the winding C-phase current, and +P and +Q represent the active power and reactive power directions of the interval to be tested.

[0047] Optionally, the data analysis module analyzes the wiring conditions of the test interval based on the hexagonal diagram to obtain analysis results, and generates a substation load test report based on the analysis results, including: performing a differential current check on the current loop corresponding to the winding based on the current amplitude of each phase in the hexagonal diagram to obtain a differential current check result; performing a phase check on each phase of the same winding based on the phase difference of each phase in the hexagonal diagram and the arrangement order of each phase to obtain a phase check result; performing a quadrant check on the active power and reactive power of the test interval based on the hexagonal diagram to obtain a quadrant check result; calculating the active power of the test interval based on the hexagonal diagram, and comparing the active power of the test interval with the active power on the opposite side of the test interval to obtain an active power balance check result; generating a substation load test report based on the differential current check result, the phase check result, the quadrant check result and the active power balance check result.

[0048] It should be noted that the analysis of the hexagonal diagram can determine whether there is any abnormal wiring in the current loop. Compare the hexagonal diagram drawn by the system with the standard hexagonal diagram. If there is a significant difference, further inspection of the wiring is required.

[0049] Specifically, after the hexagonal diagram is drawn, the data analysis module will automatically perform analysis based on the hexagonal diagram. First, the differential current of each winding is checked, and the difference between the current amplitudes of each phase in the hexagonal diagram is calculated to obtain the differential current of each phase. If the differential current is not zero or exceeds the allowable error range, this may indicate a wiring error, such as the polarity of the current transformer is reversed.

[0050] Secondly, the phase sequence needs to be checked. On the hexagonal diagram, the vectors in the hexagonal diagram are judged in a clockwise direction. If the phase sequence corresponding to each vector is not a positive sequence (ABC or ACB), there may be a wiring error. The data analysis module also needs to check the phase difference based on the hexagonal diagram. In theory, the phase difference between each phase should be 120 degrees. If the measured phase difference deviates significantly from this standard, it may mean a wiring error or a current transformer failure.

[0051] The data analysis module also needs to verify whether the quadrant of the power is correct based on the hexagonal diagram. Specifically, the quadrant of the active power and reactive power of the test interval can be determined according to the quadrant of the vectors corresponding to the voltage and current in the hexagonal diagram. If the quadrants of the active power and reactive power do not match the actual power flow, it indicates that there is a wiring abnormality in the current loop, and the actual power flow is in the positive direction out of the bus and in the negative direction into the bus.

[0052] The data analysis module also needs to verify whether the active power of the interval to be tested is balanced according to the hexagonal diagram. Specifically, the active power of the interval to be tested is calculated according to the secondary voltage data of the bus voltage transformer and the current data of the current transformer winding in the hexagonal diagram, and compared with the active power on the opposite side of the interval to be tested recorded in the power data to check whether the active power of the interval to be tested is balanced. The opposite side of the interval to be tested refers to the substation interval on the other side opposite to the interval to be tested of the current substation.

[0053] In another optional embodiment, the data analysis module is also used to calculate the active power and reactive power of the interval to be tested based on the A-phase voltage value of the secondary voltage data of the bus voltage transformer, the A-phase current value in the current data of each winding of the current transformer, and the angle between voltage and current, and compare the calculated active power and reactive power of the interval to be tested with the measured active power and measured reactive power. If the calculated active power and reactive power exceed pre-set thresholds compared with the measured active power and measured reactive power, it indicates that there is an abnormality in the current loop of the interval to be tested.

[0054] Optionally, the data analysis module calculates a power factor angle corresponding to the primary power flow data based on the primary power flow data, and updates the substation load test report based on the power factor angle, wherein the power factor angle is used to evaluate the power quality of the interval to be tested.

[0055] It should be noted that the power factor angle of the interval to be tested can be calculated through the power factor in the primary power flow data. Specifically, ,in, is the power factor angle, is the measured reactive power of the interval to be tested, and P is the measured active power of the interval to be tested. The substation load test report is updated according to the calculated power factor angle, which can be used to evaluate the power quality of the substation. A high power factor means that the power is used more efficiently, while a low power factor may indicate that too much reactive power is flowing in the circuit, resulting in reduced equipment efficiency, increased grid losses, and even possible impact on the stability and power supply quality of the substation.

[0056] Figure 3 is a schematic diagram of an analysis flow of an optional data analysis module according to an embodiment of the present invention, such as Figure 3 As shown, the steps of analysis performed by the data analysis module 102 include:

[0057] Step 1, start;

[0058] Step 2, selecting a bay to be tested from the substation;

[0059] Step 3: determine whether the differential current data is correct and whether the three-phase differential current is 0. If so, execute step 4. If not, point out the faulty current loop, and have the technician perform a comprehensive analysis of the current loop again after troubleshooting the loop.

[0060] Specifically, a differential current check is performed on the current loop based on the current data of each winding of the current transformer corresponding to the current loop to determine whether the differential current data is correct and whether the three-phase differential current of the current loop is 0. If not, a faulty current loop is pointed out and a technician performs fault handling on the loop.

[0061] In addition, considering that the on-site conditions are relatively complex and there are often some errors, a differential current upper limit value ΔI can be set. As long as the error does not exceed this value, the test can be judged to have passed.

[0062] Step 4: determine whether the phase angle difference of the three-phase current of the same winding is arranged in a positive sequence of 120 degrees. If so, execute step 5. If not, point out the current loop with fault, and the technician will perform a comprehensive analysis of the current loop again after troubleshooting the loop;

[0063] Similarly, if there are errors due to other reasons such as on-site wiring process, it is also necessary to set the upper limit value Δθ of the current phase angle difference.

[0064] Step 5: Determine whether the quadrants where P and Q are located are correct and consistent with the background records. If so, execute step 6. If not, point out the faulty current loop, and the technician will perform a comprehensive analysis of the current loop again after troubleshooting the loop.

[0065] Specifically, the background record refers to the quadrant in which the measured active power of the interval to be tested and the measured reactive power of the interval to be tested are located in the primary flow data. The data analysis module can determine the quadrant of the active power and reactive power of the interval to be tested according to the quadrant in which the vectors corresponding to the voltage and current in the hexagonal diagram are located, and judge whether the quadrants in which the active power P and reactive power Q are located are correct, and compare it with the background recorded data, stipulating that the power sent out from the bus is positive and the power flowing into the bus is negative. If so, the test passes; if not, it points out the faulty current loop and the technicians perform fault troubleshooting on the loop.

[0066] Step 6: determine whether the active power of the interval to be tested is balanced. If so, execute step 7. If not, point out the current loop with faults, and let the technicians perform comprehensive analysis on the current loop again after troubleshooting the loop.

[0067] Specifically, the active power of the interval to be tested is calculated based on the secondary voltage data of the bus voltage transformer and the current data of the current transformer winding in the hexagonal diagram, and compared with the active power on the opposite side of the interval to be tested recorded in the power data. The opposite side of the interval to be tested refers to the substation interval on the other side opposite to the interval to be tested of the current substation. If so, the test passes; if not, a faulty current loop is indicated, and the technicians perform fault handling on the loop.

[0068] Step 7: Determine whether the P and Q values ​​are consistent with the background measurement and control data. If yes, execute step 8. If not, point out the faulty current loop, and let the technicians perform comprehensive analysis on the loop again after troubleshooting.

[0069] Specifically, the background measurement and control data refers to the measured active power and reactive power of the interval to be tested in the primary power flow data. The active power and reactive power values ​​are calculated using the acquired power data to determine whether the active power P and reactive power Q are consistent with the background measurement and control data. If so, the test passes. If not, the faulty current loop is pointed out, and the technicians perform fault handling on the loop. , , P represents the active power value of the interval to be tested, Q represents the reactive power value of the interval to be tested, U represents the voltage value of phase A of the secondary voltage data of the bus voltage transformer, and I represents the current value of phase A in the current data of each winding of the current transformer. represents the angle between the above voltage and current;

[0070] Step 8: If the above steps 3 to 7 are all judged to be yes, it means that the substation test interval has passed the test and there is no fault circuit;

[0071] Step 9, determine whether there is an untested bay in the substation, if not, execute step 10, if yes, repeat the above steps 2 to 9;

[0072] The substation test passes when all the test intervals in the substation pass the test.

[0073] Step 10, end.

[0074] The data analysis module 102 conducts a comprehensive analysis of the substation fault by analyzing the hexagonal diagram, calculating the power factor angle, and determining the above four tests, and tests the substation quickly and accurately.

[0075] The data display module 103 is used to display the substation load test report.

[0076] It should be noted that the data analysis module 102 transmits the generated substation load test report to the data display module 103, and the test report is displayed through the data display module, and the technicians can view the generated test report on site.

[0077] Optionally, the data display module uses an LED touch screen, which is used to provide an editable interface to the user, and receive input substation information through the editable interface, wherein the substation information at least includes: the substation identification of the interval to be tested, the current loop number of the interval to be tested, the function of the winding corresponding to the current loop of the interval to be tested, the transformation ratio of each winding, and the wiring method of the current loop of the interval to be tested.

[0078] It should be noted that the data display module further includes an LED touch screen, and the substation load test system can interact with the user through the LED touch screen, and the LED touch screen can display visual information such as hexagonal diagrams and calculation results, and can also provide a user editing function, allowing the user to edit the substation information, so that when the substation is tested with load, the substation information of the interval to be tested is input into the substation load test system, and the substation information may include the substation identification of the interval to be tested, the current loop number of the interval to be tested, the role of the winding corresponding to the current loop of the interval to be tested, the ratio of each winding, the wiring method of the current loop of the interval to be tested, etc. Therefore, it can be applied to various types of substation tests, and the scope of application of the system is improved.

[0079] In another optional embodiment, the substation load test system further includes: a power supply interface for connecting a power supply and supplying power to the substation load test system; and a USB module for providing an external interface for copying the substation load test report.

[0080] It should be noted that the substation load test system also includes a power interface, which provides two power options: lithium battery power supply and mains power supply. This ensures the stable operation of the test system in different environments and is suitable for field operations and indoor testing of power systems, especially in situations where the power supply is unstable or long-term continuous testing is required. It can provide continuous power support to ensure the continuity and integrity of the test.

[0081] It should be noted that the substation load test system also includes a USB interface, which can provide a test report copy function, making it convenient for users to copy and store the substation load test report.

[0082] Optionally, the substation load test system further includes: a data printing module, which is used to receive a printing instruction from the data display module and print a substation load test report.

[0083] It should be noted that the substation load test system of the embodiment of the present invention also includes a data printing module, which provides a printing function to the user. The user end triggers the printing operation of the test report through the LED touch screen, and can print the generated substation load test report on site.

[0084] In another optional embodiment, the substation load test system further includes: a storage module for storing load test report templates of different types of substations based on historical data.

[0085] It should be noted that the substation load test system also includes: a storage module, in which a series of typical load test hexagonal diagram report templates are configured, including 500kV lines, 500kV main transformers, 220kV lines, 220kV main transformers, 110kV lines, 110kV main transformers, etc. The report template can be automatically called according to the type of power equipment in the interval to be tested, and the final substation load test report can be generated according to the template, thereby unifying the format of the test report for easy viewing by technical personnel.

[0086] The above-mentioned substation load test system obtains the power data of each test interval in the substation through the data acquisition module 101, wherein the power data at least includes: the primary load data of the test interval, the primary flow data, the current data of each winding of the current transformer and the secondary voltage data of the bus voltage transformer, and draws a hexagonal diagram based on the power data through the data analysis module 102, and analyzes the wiring condition of the current loop of the test interval based on the hexagonal diagram to obtain the analysis results, and generates the substation load test report based on the analysis results, and finally displays the substation load test report through the data display module 103.

[0087] In the present embodiment, a substation load test system is proposed, which is applied to a portable substation load tester, and can directly obtain real-time power data of each interval to be tested in the substation, and draw a hexagonal diagram based on the power data. The substation is tested and analyzed through the hexagonal diagram, and a substation load test report is automatically generated. The test report is displayed through a data display module, thereby realizing the automation of substation load testing, improving the efficiency of hexagonal diagram drawing, thereby improving the testing efficiency of the substation, and ensuring that the substation can be put into use quickly, thereby solving the technical problem in the related technology that when the substation is tested on load, the hexagonal diagram is manually drawn by the collected data to test and analyze the substation, and the test efficiency is low.

[0088] Another optional specific implementation is described in detail below.

[0089] Figure 4 is a schematic diagram of an optional substation load tester according to an embodiment of the present invention, such as Figure 4 As shown, the substation load tester includes an input current module (two-way input current module 401), an input voltage module (two-way input voltage module 402), a USB module 403, a power interface 404, an LED touch screen 405 and a printing module 406. As a portable device, the substation load tester can be used with staff to participate in on-site testing of the substation without the need to perform related operations through wireless communication. It has lower requirements on the use environment and a wider range of adaptability.

[0090] The following is a detailed description in conjunction with another embodiment.

[0091] Embodiment 2

[0092] According to an embodiment of the present invention, an embodiment of a method for testing a substation on load is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here. The specific implementation manner and beneficial effects of the method for testing a substation on load can refer to the aforementioned embodiment 1 and will not be repeated here.

[0093] Figure 5 is a flow chart of an optional substation load test method according to an embodiment of the present invention, such as Figure 5 As shown, the method comprises the following steps:

[0094] Step S501, obtaining power data of each bay to be tested in the substation.

[0095] It should be noted that the interval to be tested refers to a newly put into use substation or a substation to be put into use after comprehensive transformation. The substation needs to be loaded before it is officially put into use to simulate the working conditions under the actual use scenario, so as to verify the performance of the substation equipment and the correctness of the secondary circuit, and ensure that the substation can be put into use normally.

[0096] The embodiment of the present invention obtains power data through the data acquisition module 101 of the substation load test system, and the power data at least includes: primary load data of the interval to be tested, specifically three-phase current and three-phase voltage data of the interval to be tested, primary flow data, specifically including measured active power, measured reactive power and power factor data of the interval to be tested, current data of each winding of the current transformer and secondary A-phase voltage data of the bus voltage transformer, and the secondary A-phase voltage data refers to the A-phase voltage data on the low-voltage side of the bus current transformer.

[0097] Step S502, drawing a hexagonal diagram based on the power data, analyzing the wiring conditions of the current loop of the interval to be tested based on the hexagonal diagram, obtaining analysis results, and generating a substation load test report based on the analysis results.

[0098] The embodiment of the present invention can automatically draw a hexagonal diagram through the data analysis module 102. The hexagonal diagram refers to drawing the phase relationship between each measured quantity and the selected reference quantity on the vector diagram, and then judging whether there is any abnormal wiring in the current loop, thereby obtaining the analysis result, and generating a substation load test report based on the analysis result.

[0099] Optionally, the steps of analyzing the wiring condition of the test interval based on the hexagonal diagram to obtain analysis results, and generating a substation load test report based on the analysis results include: performing a differential current check on the current loop corresponding to the winding based on the current amplitude of each phase in the hexagonal diagram to obtain a differential current check result; performing a phase check on each phase of the same winding based on the phase difference of each phase and the arrangement order of each phase in the hexagonal diagram to obtain a phase check result; performing a quadrant check on the active power and reactive power of the substation to be tested based on the hexagonal diagram to obtain a quadrant check result; calculating the active power of the substation to be tested based on the hexagonal diagram, and comparing the active power of the substation to be tested with the active power on the opposite side of the test interval to obtain an active power balance check result; generating a substation load test report based on the differential current check result, the phase check result, the quadrant check result and the active power balance check result.

[0100] It should be noted that the data analysis module 102 can also calculate the power factor angle of the substation based on the primary flow data, and the power factor angle can be used to evaluate the power quality of the substation. A high power factor means that the power is used more efficiently, while a low power factor may indicate that too much reactive power flows in the circuit, resulting in reduced equipment efficiency, increased grid losses, and even possible impact on the stability and power supply quality of the substation.

[0101] The data analysis module 102 of the embodiment of the present invention can perform differential current check, current verification and phase difference verification, active power and reactive power quadrant verification, active power balance verification and power factor angle analysis on each current loop of the test interval according to the hexagonal diagram, perform load testing on the substation from multiple dimensions, and identify faulty current loops and equipment nodes.

[0102] Through the above steps, firstly, the power data of each interval to be tested of the substation is obtained, wherein the power data at least includes: the primary load data of the interval to be tested, the primary flow data, the current data of each winding of the current transformer and the secondary voltage data of the bus voltage transformer, and then a hexagonal diagram is drawn based on the power data, and the wiring condition of the interval to be tested is analyzed based on the hexagonal diagram to obtain the analysis results, and a substation load test report is generated based on the analysis results.

[0103] In the present embodiment, a substation load test system is proposed, which is applied to a portable substation load tester, and can directly obtain real-time power data of each interval to be tested in the substation, and draw a hexagonal diagram based on the power data. The substation is tested and analyzed through the hexagonal diagram, and a substation load test report is automatically generated. The test report is displayed through a data display module, thereby realizing the automation of substation load testing, improving the efficiency of hexagonal diagram drawing, thereby improving the testing efficiency of the substation, and ensuring that the substation can be put into use quickly, thereby solving the technical problem in the related technology that when the substation is tested on load, the hexagonal diagram is manually drawn by the collected data to test and analyze the substation, and the test efficiency is low.

[0104] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0105] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0106] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0107] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0108] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0109] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0110] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A substation load test system, characterized in that: Applicable to portable substation load tester, including: A data acquisition module, used to acquire power data of each interval to be tested in the substation, wherein the interval to be tested is a unit to be tested composed of power equipment in the substation, and the power data at least includes: primary load data of the interval to be tested, primary flow data of the interval to be tested, current data of each winding of the current transformer of the interval to be tested, and secondary voltage data of the bus voltage transformer of the substation; A data analysis module, used for drawing a hexagonal diagram based on the power data of the interval to be tested, analyzing the wiring conditions of the interval to be tested of the substation based on the hexagonal diagram, obtaining analysis results, and generating a substation load test report based on the analysis results; The data analysis module draws a hexagonal diagram based on the power data, including: taking the phase of the A-phase voltage in the secondary voltage data of the bus voltage transformer as the reference phase; obtaining the current amplitude and current phase of each phase current in the current data of each winding of the current transformer; and drawing the hexagonal diagram of each winding based on the reference phase, the current amplitude and current phase of each phase current of each winding; The data analysis module analyzes the wiring condition of the interval to be tested based on the hexagonal diagram to obtain an analysis result, and generates a substation load test report based on the analysis result, including: performing a differential current check on the current loop corresponding to the winding based on the current amplitude of each phase in the hexagonal diagram to obtain a differential current check result; performing a phase check on each phase of the same winding based on the phase difference of each phase in the hexagonal diagram and the arrangement order of each phase to obtain a phase check result; performing a quadrant check on the active power and reactive power of the interval to be tested based on the hexagonal diagram to obtain a quadrant check result; calculating the active power of the interval to be tested based on the hexagonal diagram, and comparing the active power of the interval to be tested with the active power on the opposite side of the interval to be tested to obtain an active power balance check result; generating the substation load test report based on the differential current check result, the phase check result, the quadrant check result and the active power balance check result; The data analysis module calculates a power factor angle corresponding to the primary power flow data based on the primary power flow data, and updates the substation load test report based on the power factor angle, wherein the power factor angle is used to evaluate the power quality of the interval to be tested; A data display module is used to display the substation load test report. The data display module adopts an LED touch screen. The LED touch screen is used to provide an editable interface for the user, and receives input substation information through the editable interface, wherein the substation information at least includes: the substation identification of the interval to be tested, the current loop number of the interval to be tested, the function of the winding corresponding to the current loop of the interval to be tested, the transformation ratio of each winding, and the wiring method of the current loop of the interval to be tested.

2. The test system according to claim 1, characterized in that: Also includes: The data printing module is used to receive the printing instruction of the data display module and print the substation load test report.

3. The test system according to claim 1, characterized in that: The data acquisition module comprises two-way input current submodules and two-way input voltage submodules. The data acquisition module collects data on two current loops through the two-way input current submodules and the two-way input voltage submodules.

4. The test system according to claim 1, characterized in that: The data acquisition module determines the current loop number to be measured, and measures each winding of the current transformer corresponding to the current loop based on the current loop number to obtain current amplitude data and phase data of each winding, and obtains current data of each winding of the current transformer based on the current amplitude data and the phase data of each winding.

5. A substation load testing method based on the test system of claim 1, characterized in that: include: Obtaining power data of each to-be-tested interval in the substation, wherein the power data at least includes: primary load data, primary flow data, current data of each winding of the current transformer, and secondary voltage data of the substation bus voltage transformer of the to-be-tested interval; A hexagonal diagram is drawn based on the power data, and the wiring condition of the current loop of the interval to be tested is analyzed based on the hexagonal diagram to obtain an analysis result, and a substation load test report is generated based on the analysis result.

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