A substation PT interface screen secondary voltage phase checking device and method

Abstract

The application provides a substation PT interface screen secondary voltage phase checking device, comprising a voltage sampling module and a data processing module; the voltage sampling module collects effective secondary values and angles of each bus protection measurement group voltage U A 、 B 、 C 、 L 、 N and metering voltage U a 、 b 、 c 、 n ; the data processing module determines two sides of each bus tie or each sectionalizing switch, and generates a switching signal based on the opening and closing states of each bus tie or each sectionalizing switch, so as to determine a bus group for phase checking and a corresponding phase checking type, and generate a phase checking result by combining the effective secondary values and angles of each bus protection measurement group voltage U A 、 B 、 C 、 L 、 N and metering voltage U a 、 b 、 c 、 n , and alarm or not alarm. The application also provides a substation PT interface screen secondary voltage phase checking method. By implementing the application, the voltage phase checking work is intelligentized, the human operation error is reduced, the phase checking accuracy and the field work efficiency are improved, and the drawbacks of the traditional secondary voltage phase checking method are avoided.

Description

Technical Field

[0001] This invention relates to the field of relay protection technology, and in particular to a secondary voltage phase comparison device and method for substation PT interface panels. Background Technology

[0002] Currently, phase verification of secondary voltage is required during the power transmission phase of substation renovation and expansion projects.

[0003] Currently, the typical method for secondary voltage phase verification involves one person using a multimeter to take measurements while another person records the data. During power transmission, to ensure the accuracy of voltage in newly connected or upgraded intervals, verification is often performed through phase verification with both the same and different power sources. Measuring with both the same and different power sources is not only time-consuming (generally 1-2 hours), but also cumbersome, error-prone, and even dangerous. For example, verifying the voltage of one PT with the same power source and one PT with the different power source typically requires approximately 26 measurements of the protection and metering groups. Furthermore, for newly expanded main transformer intervals, voltage phase verification is also required between high-voltage, medium-voltage, and low-voltage sections.

[0004] Given the problems of excessive measurement data and easy measurement errors in current secondary voltage phase comparison methods, as well as the problem of PT circuit breaker tripping causing maloperation of protection devices when the secondary voltage phase is incorrect and the busbars are operating in parallel, it is necessary to develop a secondary voltage phase comparison device inside the PT interface panel of a substation to reduce human error, improve the accuracy of phase comparison, and increase the efficiency of on-site work. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a secondary voltage phase comparison device and method in the PT interface panel of a substation, which makes the voltage phase comparison work intelligent, reduces human operation error, improves the accuracy of phase comparison and on-site work efficiency, thereby avoiding the drawbacks of traditional secondary voltage phase comparison methods.

[0006] To address the aforementioned technical problems, this invention provides a secondary voltage phase comparison device within a substation PT interface panel. This device, installed within the substation PT interface panel, includes a voltage sampling module and a data processing module.

[0007] One end of the voltage sampling module is connected to the predefined bus voltage connection points within the substation PT interface panel, and the other end is connected to the first end of the data processing module, used to collect the voltage U of each bus protection measurement group. A U B U C U L U N and the metering voltage U of each bus a Ub U c U n The effective quadratic value and angle are sent to the data processing module;

[0008] The second end of the data processing module is connected to the auxiliary contacts of each bus tie or each sectional switch. This is used to determine the two busbars on both sides of each bus tie or each sectional switch, and to generate corresponding switching signals based on the opening and closing states of each bus tie or each sectional switch. This is to determine the busbar group of the phase and the corresponding phase type, and is combined with the voltage U of each busbar protection measurement group acquired by the voltage sampling module. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase identification result of each group of phase identification buses, and then an alarm or no alarm is triggered. If a bus tie or sectionalizing switch is closed, the generated switch signal is 1, and the phase identification type of the two connected buses is the same power supply phase identification. If a bus tie or sectionalizing switch is open, the generated switch signal is 0, and the phase identification type of the two connected buses is the opposite power supply phase identification.

[0009] The data processing module includes a bus phase type determination submodule, a phase data calculation submodule, and an alarm submodule; wherein,

[0010] The bus phase type determination submodule is used to determine the two busbars on both sides of each bus tie or section switch, and to generate corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group of phase and the corresponding phase type; wherein, if a bus tie or section switch is closed, the generated switching signal is 1, and the phase type of the two connected busbars is the same power supply phase; if a bus tie or section switch is open, the generated switching signal is 0, and the phase type of the two connected busbars is the opposite power supply phase.

[0011] The nuclear phase data calculation submodule is used to calculate the nuclear phase data according to formula U. a1 -U a2 U a1 -U b2 U a1 -U c2 U b1 -U a2 U b1 -U b2 U b1 -U c2 U c1 -Ua2 U c1 -U b2 U c1 -U c2 U a1 -U n1 U b1 -U n1 U c1 -U n1 U a2 -U n2 U b2 -U n2 U c2 -U n2 and U l2 -U n2 The difference in metering voltage for each group of phase busbars is calculated, and the difference is calculated according to formula U. A1 -U A2 U A1 -U B2 U A1 -U C2 U B1 -U A2 U B1 -U B2 U B1 -U C2 U C1 -U A2 U C1 -U B2 U C1 -U C2 U L1 -U L2 U A1 -U N1 U B1 -U N1 U C1 -U N1 U A2 -U n2 U B2 -U N2 U C2 -U N2 U L2 -U N2 and U L1 -U N1 The difference in the protection measurement voltage of each group of phase busbars is calculated, and further combined with the phase type of each group of phase busbars, to generate the phase comparison result for each group of phase busbars; where U a1 U b1 U c1 U n1 U is the metering voltage of one bus in each group of phase busbars. A1 UB1 U C1 U N1 U L1 For the corresponding protection measurement voltage; U a2 U b2 U c2 U n2 U is the metering voltage of another bus in each group of phase busbars. A2 U B2 U C2 U N2 U L2 The corresponding protection measurement voltage;

[0012] The alarm submodule is used to compare the protection measurement voltage difference and metering voltage difference in the phase comparison results of each group of phase busbars with the corresponding predetermined thresholds, and to set an alarm or not to set an alarm based on the comparison results.

[0013] This also includes: a human-machine interaction module; among which,

[0014] The human-machine interface module is connected to the third terminal of the data processing module. It is used to display the voltage collected by the voltage sampling module, print the phase comparison results of the voltage collected by the voltage sampling module and the data processing module, manually set the predetermined threshold of the data processing module, and provide intuitive reminders of the alarms of the data processing module.

[0015] The human-machine interface module comprises an LCD panel, device buttons, alarm lights, and a printer output interface; wherein,

[0016] The LCD panel is used to display the voltage collected by the voltage sampling module;

[0017] The printer output interface is connected to an external printer and is used to print data from the voltage collected by the voltage sampling module and the phase comparison results of the data processing module.

[0018] The device buttons are used to manually set a predetermined threshold for the data processing module.

[0019] The alarm light is used to provide a visual reminder of any alarms triggered by the data processing module.

[0020] It also includes a power supply module; wherein the power supply module uses a DC 110 / 220V power supply to power all modules.

[0021] This invention also provides a method for secondary voltage phase comparison within a substation PT interface panel, implemented on the aforementioned secondary voltage phase comparison device within a substation PT interface panel. The method includes the following steps:

[0022] Collect voltage U of each bus protection measurement group A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle;

[0023] The system determines the busbars on both sides of each bus tie or section switch, and generates corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group and corresponding phase type. This is combined with the voltage U of each busbar protection measurement group collected by the voltage sampling module. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase identification result of each group of phase identification buses, and then an alarm or no alarm is triggered. If a bus tie or sectionalizing switch is closed, the generated switch signal is 1, and the phase identification type of the two connected buses is the same power supply phase identification. If a bus tie or sectionalizing switch is open, the generated switch signal is 0, and the phase identification type of the two connected buses is the opposite power supply phase identification.

[0024] Specifically, the determination of the two busbars on both sides of each bus tie or each section switch, and the generation of corresponding switching signals based on the opening and closing states of each bus tie or each section switch, are used to determine the busbar group of the phase and the corresponding phase type, and combined with the voltage U of each busbar protection measurement group collected by the voltage sampling module. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase analysis results for each group of phase busbars. The specific steps for further alarm or non-alarm settings include:

[0025] The system determines the busbars on both sides of each bus tie or section switch, and generates corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group and corresponding phase type. Specifically, if a bus tie or section switch is closed, the generated switching signal is 1, and the phase type of the busbars on both sides is the same power supply phase type; if a bus tie or section switch is open, the generated switching signal is 0, and the phase type of the busbars on both sides is the opposite power supply phase type.

[0026] According to formula U a1 -U a2 U a1 -U b2 U a1 -U c2 U b1 -U a2 U b1 -U b2 U b1 -U c2 U c1 -U a2 U c1 -U b2 U c1 -U c2 U a1 -U n1 U b1 -U n1 U c1 -U n1 U a2 -U n2 U b2 -U n2 U c2 -U n2 and U l2 -U n2 The difference in metering voltage for each group of phase busbars is calculated, and the difference is calculated according to formula U. A1 -U A2 U A1 -U B2 U A1 -U C2 U B1 -U A2 U B1 -U B2 U B1 -U C2 U C1 -U A2 U C1 -U B2 U C1 -U C2 U L1 -U L2 UA1 -U N1 U B1 -U N1 U C1 -U N1 U A2 -U n2 U B2 -U N2 U C2 -U N2 U L2 -U N2 and U L1 -U N1 The difference in the protection measurement voltage of each group of phase busbars is calculated, and further combined with the phase type of each group of phase busbars, to generate the phase comparison result for each group of phase busbars; where U a1 U b1 U c1 U n1 U is the metering voltage of one bus in each group of phase busbars. A1 U B1 U C1 U N1 U L1 For the corresponding protection measurement voltage; U a2 U b2 U c2 U n2 U is the metering voltage of another bus in each group of phase busbars. A2 U B2 U C2 U N2 U L2 The corresponding protection measurement voltage;

[0027] The protection measurement voltage difference and metering voltage difference in the phase comparison results of each group of phase busbars are compared with the corresponding predetermined thresholds, and an alarm is triggered or not triggered based on the comparison results.

[0028] The method further includes:

[0029] The system displays the collected voltage, prints the collected voltage and the phase comparison results, allows manual setting of the predetermined threshold, and provides intuitive alerts for the alarms.

[0030] Implementing the embodiments of the present invention has the following beneficial effects:

[0031] This invention collects and compares data from each group of bus voltages to achieve intelligent voltage phase verification. Furthermore, it can display, record, and print all phase verification results, reducing human error, improving the accuracy of phase verification and on-site work efficiency, thereby avoiding the drawbacks of traditional secondary voltage phase verification methods. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0033] Figure 1 This is a schematic diagram of the structure of a secondary voltage phase comparison device inside a substation PT interface panel, provided by an embodiment of the present invention.

[0034] Figure 2 for Figure 1 A schematic diagram of the data processing module in the middle;

[0035] Figure 3 for Figure 1 A schematic diagram of the structure of the human-machine interface module;

[0036] Figure 4 This is an external scene diagram of a secondary voltage phase comparison device in a substation PT interface panel, provided by an embodiment of the present invention.

[0037] Figure 5 This invention provides a wiring diagram of a voltage sampling module in an application scenario of a secondary voltage phase comparison device within a substation PT interface panel, as provided in an embodiment of the invention.

[0038] Figure 6 This is a wiring diagram of the auxiliary contact of the bus tie sectionalizing switch mechanism in the application scenario of a secondary voltage phase comparison device in a substation PT interface panel, provided by an embodiment of the present invention.

[0039] Figure 7 This is a flowchart of a method for phase verification of secondary voltage within a substation PT interface panel, provided as an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] like Figure 1As shown in the figure, a secondary voltage phase comparison device for a substation PT interface panel is proposed in an embodiment of the present invention. It is installed within the substation PT interface panel (not shown) and includes a voltage sampling module 1 and a data processing module 2; wherein,

[0042] One end of voltage sampling module 1 is connected to the predefined bus voltage connection points (not shown) within the substation PT interface panel, and the other end is connected to the first terminal of data processing module 2, used to collect the voltage U of each bus protection measurement group. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The valid quadratic value and angle are sent to data processing module 2;

[0043] The second end of data processing module 2 is connected to the auxiliary contacts (not shown) of each bus tie or section switch. This is used to determine the busbars on both sides of each bus tie or section switch, and to generate corresponding switching signals based on the opening and closing status of each bus tie or section switch. This is to determine the busbar group of the phase and the corresponding phase type, and is combined with the voltage U of each busbar protection measurement group collected by voltage sampling module 1. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase identification result of each group of phase identification buses, and then an alarm or no alarm is triggered. If a bus tie or sectionalizing switch is closed, the generated switch signal is 1, and the phase identification type of the two connected buses is the same power supply phase identification. If a bus tie or sectionalizing switch is open, the generated switch signal is 0, and the phase identification type of the two connected buses is the opposite power supply phase identification.

[0044] Of course, the secondary voltage phase comparison device inside the PT interface panel of this substation also includes: a human-machine interface module 3 and a power supply module 4; among which,

[0045] The human-machine interface module 3 is connected to the third end of the data processing module. It is used to display the voltage collected by the voltage sampling module 1, print the phase comparison results of the voltage collected by the voltage sampling module 1 and the data processing module 2, manually set the predetermined threshold of the data processing module 2, and provide intuitive reminders of the alarms of the data processing module 2.

[0046] Power module 4 connects to all modules and uses a DC 110 / 220V power supply to power all modules.

[0047] In embodiments of the present invention, such as Figure 2 As shown, the data processing module 2 includes a bus phase type determination submodule 21, a phase data calculation submodule 22, and an alarm submodule 23; wherein,

[0048] The bus phase type determination submodule 21 connects to the auxiliary contacts of each bus tie or section switch to determine the busbars on both sides of each bus tie or section switch, and generates corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group and corresponding phase type of the phase. If a bus tie or section switch is closed, the generated switching signal is 1, and the phase type of the busbars on both sides connected is the same power supply phase. If a bus tie or section switch is open, the generated switching signal is 0, and the phase type of the busbars on both sides connected is the opposite power supply phase.

[0049] The phase data calculation submodule 22 is connected to the voltage sampling module 1 and is used to calculate the phase data according to the formula U. a1- U a2 U a1 -U b2 U a1 -U c2 U b1 -U a2 U b1 -U b2 U b1 -U c2 U c1 -U a2 U c1 -U b2 U c1 -U c2 U a1 -U n1 U b1 -U n1 U c1 -U n1 U a2 -U n2 U b2 -U n2 U c2 -U n2 and U l2 -U n2 The difference in metering voltage for each group of phase busbars is calculated, and the difference is calculated according to formula U. A1 -U A2 U A1 -U B2 U A1 -UC2 U B1 -U A2 U B1 -U B2 U B1 -U C2 U C1 -U A2 U C1 -U B2 U C1 -U C2 U L1 -U L2 U A1 -U N1 U B1 -U N1 U C1 -U N1 U A2 -U n2 U B2 -U N2 U C2 -U N2 U L2 -U N2 and U L1 -U N1 The difference in the protection measurement voltage of each group of phase busbars is calculated, and further combined with the phase type of each group of phase busbars, to generate the phase comparison result for each group of phase busbars; where U a1 U b1 U c1 U n1 U is the metering voltage of one bus in each group of phase busbars. A1 U B1 U C1 U N1 U L1 For the corresponding protection measurement voltage; U a2 U b2 U c2 U n2 U is the metering voltage of another bus in each group of phase busbars. A2 U B2 U C2 U N2 U L2 The corresponding protection measurement voltage; it should be noted that all the above difference calculation formulas are automatically calculated by the built-in program based on the effective secondary value of the voltage and the angle, which is a conventional technical method and will not be elaborated here.

[0050] The alarm submodule 23 is used to compare the protection measurement voltage difference and metering voltage difference in the phase comparison results of each group of phase busbars with corresponding predetermined thresholds, and to trigger an alarm or not trigger an alarm based on the comparison results. It should be noted that the predetermined thresholds are set proportionally based on the number of calculated differences; that is, each difference corresponds to a threshold. If the threshold is exceeded, an alarm is triggered; otherwise, no alarm is triggered. It is understood that the alarm submodule 23 can also trigger an alarm based on the effective secondary value of the voltage and the angle, but this will not be elaborated upon here.

[0051] In embodiments of the present invention, such as Figure 3 As shown, the human-machine interface module 3 consists of an LCD panel 31, device buttons 33, alarm lights 34, and a printer output interface 32; wherein,

[0052] The LCD panel 31 is used to display the voltage collected by the voltage sampling module 1;

[0053] The printer output interface 32 is connected to an external printer and is used to print the voltage collected by the voltage sampling module 1 and the phase comparison results of the data processing module 2.

[0054] Device button 33 is used to manually set a predetermined threshold for data processing module 2;

[0055] Alarm light 34 is used to provide a visual reminder of alarms from data processing module 2.

[0056] like Figures 4 to 6 As shown, the application scenario of a secondary voltage phase comparison device in a substation PT interface panel according to an embodiment of the present invention will be further explained as follows:

[0057] Figure 4 This is an external view of the secondary voltage phase comparison device inside the PT interface panel of the substation. The device is mainly rectangular in shape, and its specific size is determined according to the reserved position of the actual PT interface panel in the substation. The side of the device panel consists of 4 screws and nuts for fixing to the PT interface panel. The front end of the device mainly consists of an LCD panel, alarm lights, and device buttons. The rear end of the device mainly consists of a power module, a voltage acquisition module, and a data processing module. The secondary wiring positions are all configured by forming relevant circuits on each module.

[0058] First, based on Figure 5 The secondary cable is connected in parallel at each bus voltage connection point in the PT interface panel; simultaneously, based on Figure 6 The switch positions for connecting the bus tie and the section within the device are used to distinguish between phases with the same power supply and phases with different power supplies.

[0059] Secondly, after powering on the device, perform individual unit debugging. First, check the device's zero drift. Observe the device's sampling without adding any experimental parameters. After confirming that it is basically zero, test each voltage channel of the device using relay protection testing instruments. Test the device's sampling by simulating the application of three-phase unbalanced voltage and positive sequence angle. Observe the magnitude of the voltage values ​​and the angle display to determine whether the voltage acquisition module can correctly reflect the voltage acquisition. If an incorrect voltage acquisition value is applied, check whether the device can correctly display the alarm. Print the sampled data at this time to test whether the printer output interface can be used normally and whether there are any garbled characters. After everything is verified to be correct, proceed to the next step.

[0060] Set the device to the setpoints, and check if the device alarm displays correctly when the setting is incorrect. At the same time, verify the correctness of the bus tie and sectionalizing switch positions, and check the switching mode between the same power supply phase and different power supply phase by simulating the opening and closing of the bus tie and sectionalizing switch positions.

[0061] Then, after verifying that all functions of the device are correct, the device is tested with additional load using a relay protection test instrument to verify the function of the secondary voltage phase comparison device. The device is tested according to the actual requirements on site, and the data in Table 1 below is used to test whether the device can accurately display when the secondary voltage phase comparison is correct and when the secondary voltage phase comparison is incorrect, and to check whether the device alarm is correct.

[0062] Table 1

[0063]

[0064] Finally, after the device passes acceptance testing, it is put into use. The relay protection personnel connect the voltage of each bus to the secondary voltage phase verification device. During the power supply process, the personnel only need to check the secondary voltage phase verification device at the PT interface panel to complete the voltage phase verification work, and print a report as a subsequent archive file.

[0065] like Figure 7 As shown in the figure, a method for secondary voltage phase comparison within a substation PT interface panel is provided in an embodiment of the present invention. This method is implemented on the aforementioned secondary voltage phase comparison device within a substation PT interface panel in this embodiment. The method includes the following steps:

[0066] Step S1: Collect the voltage U of each bus protection measurement group. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle;

[0067] Step S2: Determine the busbars on both sides of each bus tie or section switch, and generate corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group and corresponding phase type, and combine this with the voltage U of each busbar protection measurement group collected by the voltage sampling module. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase identification result of each group of phase identification buses, and then an alarm or no alarm is triggered. If a bus tie or sectionalizing switch is closed, the generated switch signal is 1, and the phase identification type of the two connected buses is the same power supply phase identification. If a bus tie or sectionalizing switch is open, the generated switch signal is 0, and the phase identification type of the two connected buses is the opposite power supply phase identification.

[0068] Specifically, the determination of the two busbars on both sides of each bus tie or each section switch, and the generation of corresponding switching signals based on the opening and closing states of each bus tie or each section switch, are used to determine the busbar group of the phase and the corresponding phase type, and combined with the voltage U of each busbar protection measurement group collected by the voltage sampling module. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase analysis results for each group of phase busbars. The specific steps for further alarm or non-alarm settings include:

[0069] The system determines the busbars on both sides of each bus tie or section switch, and generates corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group and corresponding phase type. Specifically, if a bus tie or section switch is closed, the generated switching signal is 1, and the phase type of the busbars on both sides is the same power supply phase type; if a bus tie or section switch is open, the generated switching signal is 0, and the phase type of the busbars on both sides is the opposite power supply phase type.

[0070] According to formula U a1 -U a2 U a1 -U b2 U a1 -Uc2 , U b1 -U a2 , U b1 -U b2 , U b1 -U c2 , U c1 -U a2 , U c1 -U b2 , U c1 -U c2 , U a1 -U n1 , U b1 -U n1 , U c1 -U n1 , U a2 -U n2 , U b2 -U n2 , U c2 -U n2 and U l2 -U n2 ,Each unit nuclear phase difference calculation,Hereafter the basic formula U A1 -U A2 , U A1 -U B2 , U A1 -U C2 , U B1 -U A2 , U B1 -U B2 , U B1 -U C2 , U C1 -U A2 , U C1 -U B2 , U C1 -U C2 , U L1 -U L2 , U A1 -U N1 , U B1 -U N1 , U C1 -U N1 , U A2 -U n2 , U B2 -U N2 , U C2 -U N2 , U L2 -U N2 and U L1 -U N1The difference in the protection measurement voltage of each group of phase busbars is calculated, and further combined with the phase type of each group of phase busbars, to generate the phase comparison result for each group of phase busbars; where U a1 U b1 U c1 U n1 U is the metering voltage of one bus in each group of phase busbars. A1 U B1 U C1 U N1 U L1 For the corresponding protection measurement voltage; U a2 U b2 U c2 U n2 U is the metering voltage of another bus in each group of phase busbars. A2 U B2 U C2 U N2 U L2 The corresponding protection measurement voltage;

[0071] The protection measurement voltage difference and metering voltage difference in the phase comparison results of each group of phase busbars are compared with the corresponding predetermined thresholds, and an alarm is triggered or not triggered based on the comparison results.

[0072] The method further includes:

[0073] The system displays the collected voltage, prints the collected voltage and the phase comparison results, allows manual setting of the predetermined threshold, and provides intuitive alerts for the alarms.

[0074] Implementing the embodiments of the present invention has the following beneficial effects:

[0075] This invention collects and compares data from each group of bus voltages to achieve intelligent voltage phase verification. Furthermore, it can display, record, and print all phase verification results, reducing human error, improving the accuracy of phase verification and on-site work efficiency, thereby avoiding the drawbacks of traditional secondary voltage phase verification methods.

[0076] It is worth noting that in the above system embodiments, the various system units included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0077] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, optical disk, etc.

[0078] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A secondary voltage phase comparison device within a substation PT interface panel, characterized in that, It is installed inside the PT interface panel of the substation and includes a voltage sampling module and a data processing module; among which, One end of the voltage sampling module is connected to the predefined bus voltage connection points within the substation PT interface panel, and the other end is connected to the first end of the data processing module, used to collect the voltage U of each bus protection measurement group. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are sent to the data processing module. The second end of the data processing module is connected to the auxiliary contacts of each bus tie or each sectional switch. This is used to determine the two busbars on both sides of each bus tie or each sectional switch, and to generate corresponding switching signals based on the opening and closing states of each bus tie or each sectional switch. This is to determine the busbar group of the phase and the corresponding phase type, and is combined with the voltage U of each busbar protection measurement group acquired by the voltage sampling module. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase identification result of each group of phase identification buses, and then an alarm or no alarm is triggered. If a bus tie or sectionalizing switch is closed, the generated switch signal is 1, and the phase identification type of the two connected buses is the same power supply phase identification. If a bus tie or sectionalizing switch is open, the generated switch signal is 0, and the phase identification type of the two connected buses is the opposite power supply phase identification.

2. The secondary voltage phase comparison device in the substation PT interface panel as described in claim 1, characterized in that, The data processing module includes a bus phase type determination submodule, a phase data calculation submodule, and an alarm submodule; wherein... The bus phase type determination submodule is used to determine the two busbars on both sides of each bus tie or section switch, and to generate corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group of phase and the corresponding phase type; wherein, if a bus tie or section switch is closed, the generated switching signal is 1, and the phase type of the two connected busbars is the same power supply phase; if a bus tie or section switch is open, the generated switching signal is 0, and the phase type of the two connected busbars is the opposite power supply phase. The stated nuclear phase number calculation calculator model, the use of the formula U a1 -U a2 , U a1 -U b2 , U a1 -U c2 , U b1 -U a2 , U b1 -U b2 , U b1 -U c2 , U c1 -U a2 , U c1 -U b2 , U c1 -U c2 , U a1 -U n1 , U b1 -U n1 , U c1 -U n1 , U a2 -U n2 , U b2 -U n2 , U c2 -U n2 and U 12 -U n2 ,Each unit nuclear phase difference calculation,Hereafter the basic formula U A1 -U A2 , U A1 -U B2 , U A1 -U C2 , U B1 -U A2 , U B1 -U B2 , U B1 -U C2 , U C1 -U A2 , U C1 -U B2 , U C1 -U C2 , U L1 -U L2 , U A1 -U N1 , U B1 -U N1 , U C1 -U N1 , U A2 -U n2 , U B2 -U N2 , U C2 -U N2 U L2 -U N2 and U L1 -U N1 The difference in the protection measurement voltage of each group of phase busbars is calculated, and further combined with the phase type of each group of phase busbars, to generate the phase comparison result for each group of phase busbars; where U a1 U b1 U c1 U n1 U is the metering voltage of one bus in each group of phase busbars. A1 U B1 U C1 U N1 U L1 For the corresponding protection measurement voltage; U a2 U b2 U c2 U n2 U is the metering voltage of the other bus in each group of phase busbars. A2 U B2 U C2 U N2 U L2 The corresponding protection measurement voltage; The alarm submodule is used to compare the protection measurement voltage difference and metering voltage difference in the phase comparison results of each group of phase busbars with the corresponding predetermined thresholds, and to set an alarm or not to set an alarm based on the comparison results.

3. The secondary voltage phase comparison device in the substation PT interface panel as described in claim 2, characterized in that, Also includes: Human-machine interaction module; among which, The human-machine interface module is connected to the third terminal of the data processing module. It is used to display the voltage collected by the voltage sampling module, print the phase comparison results of the voltage collected by the voltage sampling module and the data processing module, manually set the predetermined threshold of the data processing module, and provide intuitive reminders of the alarms of the data processing module.

4. The secondary voltage phase comparison device in the substation PT interface panel as described in claim 3, characterized in that, The human-machine interface module consists of an LCD panel, device buttons, alarm lights, and a printer output interface; wherein... The LCD panel is used to display the voltage collected by the voltage sampling module; The printer output interface is connected to an external printer and is used to print data from the voltage collected by the voltage sampling module and the phase comparison results of the data processing module. The device buttons are used to manually set a predetermined threshold for the data processing module. The alarm light is used to provide a visual reminder of any alarms triggered by the data processing module.

5. The secondary voltage phase comparison device in the substation PT interface panel as described in claim 4, characterized in that, Also includes: A power supply module; wherein the power supply module uses a DC 110 / 220V power supply to power all modules.

6. A method for phase comparison of secondary voltage within a substation PT interface panel, characterized in that, It is implemented on the secondary voltage phase comparison device inside the substation PT interface panel as described in claim 5, and the method includes the following steps: Collect voltage U of each bus protection measurement group A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle; The system determines the busbars on both sides of each bus tie or section switch, and generates corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group and corresponding phase type. This is combined with the voltage U of each busbar protection measurement group collected by the voltage sampling module. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase identification result of each group of phase identification buses, and then an alarm or no alarm is triggered. If a bus tie or sectionalizing switch is closed, the generated switch signal is 1, and the phase identification type of the two connected buses is the same power supply phase identification. If a bus tie or sectionalizing switch is open, the generated switch signal is 0, and the phase identification type of the two connected buses is the opposite power supply phase identification.

7. The method for phase comparison of secondary voltage within the PT interface panel of a substation as described in claim 6, characterized in that, The process involves determining the two busbars on both sides of each bus tie or section switch, and generating corresponding switching signals based on the opening and closing states of each bus tie or section switch, to determine the busbar group and corresponding phase type, and combining this with the voltage U of each busbar protection measurement group acquired by the voltage sampling module. A U B U C U L U N and the metering voltage U of each bus a U b U c U n The effective quadratic value and angle are calculated to obtain the phase analysis results for each group of phase busbars. The specific steps for further alarm or non-alarm settings include: The system determines the busbars on both sides of each bus tie or section switch, and generates corresponding switching signals based on the opening and closing status of each bus tie or section switch to determine the busbar group and corresponding phase type. Specifically, if a bus tie or section switch is closed, the generated switching signal is 1, and the phase type of the busbars on both sides is the same power supply phase type; if a bus tie or section switch is open, the generated switching signal is 0, and the phase type of the busbars on both sides is the opposite power supply phase type. Nede Official U a1 -U a2 , U a1 -U b2 , U a1 -U c2 , U b1 -U a2 , U b1 -U b2 , U b1 -U c2 , U c1 -U a2 , U c1 -U b2 , U c1 -U c2 , U a1 -U n1 , U b1 -U n1 , U c1 -U n1 , U a2 -U n2 , U b2 -U n2 , U c2 -U n2 and U l2 -U n2 ,Each unit nuclear phase difference calculation,Hereafter the basic formula U A1 -U A2 , U A1 -U B2 , U A1 -U C2 , U B1 -U A2 , U B1 -U B2 , U B1 -U C2 , U C1 -U A2 , U C1 -U B2 , U C1 -U C2 , U L1 -U L2 , U A1 -U N1 , U B1 -U N1 , U C1 -U N1 , U A2 -U n2 , U B2 -U N2 , U C2 -U N2 , U L2 -U N2 and U L1 -U N1 The difference in the protection measurement voltage of each group of phase busbars is calculated, and further combined with the phase type of each group of phase busbars, to generate the phase comparison result for each group of phase busbars; where U a1 U b1 U c1 U n1 U is the metering voltage of one bus in each group of phase busbars. A1 U B1 U C1 U N1 U L1 For the corresponding protection measurement voltage; U a2 U b2 U c2 U n2 U is the metering voltage of another bus in each group of phase busbars. A2 U B2 U C2 U N2 U L2 The corresponding protection measurement voltage; The protection measurement voltage difference and metering voltage difference in the phase comparison results of each group of phase busbars are compared with the corresponding predetermined thresholds, and an alarm is triggered or not triggered based on the comparison results.

8. The method for phase comparison of secondary voltage within a substation PT interface panel as described in claim 6, characterized in that, The method further includes: The system displays the collected voltage, prints the collected voltage and the phase comparison results, allows manual setting of the predetermined threshold, and provides intuitive alerts for the alarms.

Images