A phase checking device, system and method for power distribution network

Abstract

The application discloses a phase checking device, system and method for a power distribution network, and relates to the technical field of phase sequence synchronization indication. The phase checking device comprises a phase checking module, which is used for obtaining the phase sequence of a pre-repair alternating current voltage signal, obtaining the phase sequence of an analog alternating current voltage signal, comparing the phase sequence of the pre-repair alternating current voltage signal with the phase sequence of the analog alternating current voltage signal, and obtaining a phase checking result. The phase checking system comprises the phase checking device and a phase sequence generating device. The phase sequence generating device comprises a phase sequence generating module, which is used for obtaining the phase sequence of the pre-repair alternating current voltage signal and generating the analog alternating current voltage signal with the same phase sequence. The phase checking method comprises a phase checking step, a comparison of the phase sequence of the pre-repair alternating current voltage signal with the phase sequence of the analog alternating current voltage signal, and obtaining of the phase checking result. The phase checking device, system and method improve the efficiency of the phase checking work by comparing the phase sequence of the pre-repair alternating current voltage signal with the phase sequence of the analog alternating current voltage signal.

Description

Technical Field

[0001] This invention relates to the field of phase sequence synchronization indication technology, and in particular to a phase sequence verification device, system and method for power distribution networks. Background Technology

[0002] The author conducted a search using the formula TTL_ALL:(phase)AND TACD_ALL:(phaseAND(occurrence OR generation OR formation)AND sine wave AND power), and obtained the following relatively similar existing technical solutions.

[0003] The authorization announcement number is CN104635002B, and the name is "Three-Phase Two-Waveform Adjustable Phase Angle Signal Generator for Power Systems". It includes a power supply circuit, a data calculation and waveform generation circuit, a phase angle setting circuit, and a sine wave conversion circuit. The data calculation and waveform generation circuit is connected to the power supply circuit, phase angle setting circuit, and sine wave conversion circuit. The phase angle setting circuit includes two DIP switches (K21 and K22), two transistors (V1 and V2), and three push-button switches (K23, K24, and K25). The data calculation and waveform generation circuit is a single-chip microcomputer integrated circuit. This significantly shortens the testing time, reduces the labor intensity of employees, improves work efficiency, and enhances the accuracy and correctness of tests. It can convert the generated square wave to a sine wave, playing a positive role in promoting the development of smart grid construction and management technology.

[0004] The authorization announcement number is CN215894770U, and the name is "Phase Comparison Detection Device for Testing the Phase of Power Supply Circuit Voltage". It includes: a main controller, a test voltage output interface, a sampling voltage input interface, a phase comparison module, a test voltage generation module, a display screen, an indicator light group, a phase adjustment knob assembly, a wireless signal transceiver, and a power supply module. The sampling voltage input interface, the phase comparison module, the test voltage generation module, the touch display module, the indicator light group, the power supply module, and the wireless signal transceiver are all electrically connected to the main controller. The power supply module is used to supply power to all electrical components.

[0005] The author conducted a search using the search terms TTL_ALL:((acquisition OR acquisition OR measurement) AND (phase OR phase sequence)) AND TACD_ALL:((acquisition OR acquisition OR measurement) AND (phase OR phase sequence) AND sine wave AND power), and obtained the following relatively similar existing technical solutions.

[0006] The authorization announcement number is CN206756941U, and the name is "Wireless Measurement Device for Three-Phase Phase Sequence of High-Voltage AC Lines." It includes three data acquisition units and a main unit. Each of the three data acquisition units has a wireless radio frequency (RF) transmitting unit, and the RF transmitting units of the three data acquisition units operate on different frequency bands. The main unit has a wireless RF receiving unit. Each data acquisition unit also has a capacitive sensing sampling unit for sampling the voltage waveform of the high-voltage line and a conversion unit for converting the sine wave to a square wave. The output of the capacitive sensing sampling unit is connected to the input of the conversion unit, and the output of the conversion unit is connected to the wireless RF transmitting unit. Utilizing wireless RF technology ensures line safety and personal safety, enables simultaneous measurement of three-phase high-voltage lines, and provides clear and concise results. Any two data acquisition units can be used together to perform phase verification. It can also directly measure the phase values ​​of 10KV to 500KV lines, eliminating the need for secondary equipment.

[0007] The authorization announcement number is CN103257273B, and the title is "Method for Measuring Phase Difference of Same-Frequency Periodic Signals". It includes the following steps: S1, synchronously sampling W data points of two measured same-frequency periodic signals at equal intervals; S2, acquiring the harmonic amplitudes A1k and A2k and the harmonic phase angles of the m1 and m2 harmonics of the two measured same-frequency periodic signals; S3, calculating the initial phase angles of the two measured same-frequency periodic signals based on the harmonic amplitudes A1k and A2k and the harmonic phase angles; S4, calculating the phase difference based on the difference between the two initial phase angles to obtain a high-precision phase difference measurement result, thereby improving the quality of instruments and equipment in fields such as power equipment condition monitoring, signal acquisition and analysis, communication, and automatic control based on phase difference technology.

[0008] The author conducted a search using the search terms TTL_ALL:((core OR check) AND phase) AND TACD_ALL:((core OR check) AND phase AND sine wave AND power), and obtained the following relatively similar existing technical solutions.

[0009] The authorization announcement number is CN209215483U, and the name is "A Multi-Mode Phase Comparison Device for Substations Across Bays." It includes a phase comparison module, a delay module, and an analog signal acquisition module. The output of the delay module is connected to the pulse input of the SV decoding module. The signal output of the SV decoding module is connected to the digital input of the digital-to-analog converter module. The analog output of the digital-to-analog converter module is connected to the input of a first sine wave to square wave module. The output of the first sine wave to square wave module is connected to the input of a multiplexer. The analog output of the analog signal acquisition module is connected to the input of a second sine wave to square wave module. The output of the second sine wave to square wave module is connected to the input of a multiplexer. The output of the multiplexer is connected to the input of the phase comparison module. It is suitable for both conventional and intelligent substations; it is compatible with SV digital sample values ​​and transformer analog sample values.

[0010] The authorization announcement number is CN214226116U, and the name is "A Phase Comparison Signal Acquisition Device for Power Lines". It includes an acquisition head and a telescopic rod. A counterweight is installed on one side of the acquisition head, and a control panel is installed on the other side. A groove is formed at the top of the acquisition head, and a sensing end is located on one side of the groove, connecting to the control panel. A mounting base is provided at the bottom of the acquisition head, and a locking mechanism is installed within the mounting base. A connector is provided at the top of the telescopic rod, and a limit mechanism is provided on the connector. The connector passes through the mounting base, and the limit mechanism cooperates with the locking mechanism. During phase comparison operations, the acquisition head is suspended from the power line using the telescopic rod. Then, a voltage sine wave consistent with the power line is sensed at the sensing end. The sensed signal is remotely transmitted to the receiving end via a wireless communication module, completing the signal acquisition. The overall structure is simple in design, easy to assemble, and portable.

[0011] The author conducted a search using the search term TTL_ALL:(wireless phase comparator) and obtained the following relatively similar existing technical solutions.

[0012] The authorization announcement number is CN212989483U, and the name is "A Remote Wireless Phase Comparator". It includes a housing, an insulated telescopic rod on one side of the housing, a transmitter on one side of the insulated telescopic rod, a connecting device at the bottom of the transmitter, and a support device at the bottom of the housing. The connecting device includes a connecting cylinder, which is fixedly connected to the transmitter. A limit strip is fixedly installed on the inner wall of the connecting cylinder. A baffle is slidably connected inside the connecting cylinder, and a spring is fixedly installed between the baffle and the connecting cylinder. A rotating ring is fitted on the outer surface of the connecting cylinder, and a communicating groove is opened inside the connecting cylinder. A limit block is fixedly installed on the outer surface of the rotating ring, extending through the communicating groove into the interior of the connecting cylinder. By setting up this connecting device, the time required for workers to install the transmitter is shortened, allowing workers to quickly perform measurements and improving work efficiency.

[0013] The authorization announcement number is CN205539215U, and the name is Low-Voltage Wireless Phase Comparator. It includes a wirelessly connected data acquisition unit and a host. The data acquisition unit communicates with the host via adaptive frequency-hopping Bluetooth. The data acquisition unit includes a signal triggering unit, a signal acquisition unit, a central processor, an operational amplifier unit, and a communication transmitting unit. The signal triggering unit is connected to both the central processor and the signal acquisition unit. The central processor is connected to both the operational amplifier unit and the signal acquisition unit. The signal acquisition unit is connected to the operational amplifier unit, and the operational amplifier unit is connected to the communication transmitting unit. The host includes a communication receiving unit, a low-pass filter unit, an A / D conversion unit, a central processor, a display, a memory, and a voice unit. The communication receiving unit is sequentially connected to the low-pass filter unit, the A / D conversion unit, and the central processor. The central processor is connected to the display, the memory, and the voice unit. The data acquisition unit can be a general-purpose data acquisition unit, a data acquisition unit specifically for ring main units, or a data acquisition unit specifically for medium-voltage switchgear. It enables wireless phase comparison of high-voltage lines, ring main units, and medium-voltage switchgear.

[0014] Based on the aforementioned patent documents and existing technical solutions, the inventors analyze the existing technical solutions as follows.

[0015] In the daily operation and maintenance of power distribution networks, large-scale power outages and complex faults requiring extensive power cuts often involve the disconnection and replacement of multiple distribution lines, switches, and disconnectors. This necessitates phase verification before the power distribution equipment is put back into operation. Currently, phase verification is performed on both sides of the switch while it is energized before large-scale comprehensive maintenance and fault restoration of distribution lines. If the phase verification results show an error, repeated power outages are required to perform phase switching, leading to higher power outage costs and numerous inconveniences.

[0016] Existing technical issues and considerations:

[0017] How to solve the technical problem of low efficiency in nuclear phase operation. Summary of the Invention

[0018] The technical problem to be solved by the present invention is to provide a phase-matching device, system and method for power distribution networks, thereby solving the technical problem of low phase-matching efficiency.

[0019] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a phase detection device for a power distribution network includes a phase detection module, which is used to obtain the phase sequence of the AC voltage signal before maintenance, obtain the phase sequence of the simulated AC voltage signal, wherein the simulated AC voltage signal is a signal with the same phase sequence generated by the phase sequence of the AC voltage signal before maintenance, and compare the phase sequence of the AC voltage signal before maintenance and the phase sequence of the simulated AC voltage signal to obtain the phase detection result.

[0020] A further technical solution is as follows: the phase comparison module includes a phase comparison acquisition unit, a communication unit, and a phase comparison controller. The phase comparison acquisition unit includes a first phase comparison acquisition unit and a second phase comparison acquisition unit. The phase comparison controller is connected to and communicates with the communication unit of the phase comparison device. The first phase comparison acquisition unit is connected to and communicates with the communication unit of the phase comparison device. The second phase comparison acquisition unit is connected to and communicates with the communication unit of the phase comparison device. The first phase comparison acquisition unit is used to obtain the phase sequence of the AC voltage signal before maintenance on the line and send it to the phase comparison controller. The second phase comparison acquisition unit is used to obtain the phase sequence of the analog AC voltage signal on the line and send it to the phase comparison controller. The phase comparison controller is used to obtain the phase sequence sent by the phase comparison acquisition unit, compare the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal, and obtain the phase comparison result.

[0021] A further technical solution includes: a transducer for obtaining and expressing the nuclear phase results shared by the nuclear phase controller; the nuclear phase controller is connected to and communicates with the transducer; the nuclear phase controller includes a first acquisition button, a second acquisition button, and a nuclear phase button; the first acquisition button is electrically connected to the nuclear phase controller, the second acquisition button is electrically connected to the nuclear phase controller, and the nuclear phase button is electrically connected to the nuclear phase controller; or the nuclear phase controller includes a touch unit, which is electrically connected to the nuclear phase controller.

[0022] A further technical solution is that the phase sequence matching module also includes a phase sequence matching program module, which is used for the first phase sequence matching acquisition unit to obtain the phase sequence of the AC voltage signal before maintenance on the line and send it to the phase sequence matching controller, the second phase sequence matching acquisition unit to obtain the phase sequence of the analog AC voltage signal on the line and send it to the phase sequence matching controller, and the phase sequence matching controller to obtain the phase sequence of the AC voltage signal before maintenance and the phase sequence of the analog AC voltage signal and then compare them to obtain the phase sequence matching result.

[0023] A further technical solution is that the phase comparison program module is also used to obtain the phase sequence of the AC voltage signal before maintenance when the phase comparison controller receives the first working instruction, and to obtain the phase sequence of the analog AC voltage signal when the phase comparison controller receives the second working instruction, and to share and send the phase comparison results.

[0024] A further technical solution is as follows: the phase sequence control module is the first phase sequence control module, which is used to obtain the phase sequence of the AC voltage signal before maintenance when the phase sequence control receives a maintenance command from the handheld terminal, and to obtain the phase sequence of the analog AC voltage signal when the phase sequence control receives an analog command from the handheld terminal.

[0025] A further technical solution is as follows: the phase comparison program module is a second phase comparison module, which is used to obtain the phase sequence of the AC voltage signal before maintenance when the phase comparison controller obtains the first acquisition command issued by the maintenance personnel through the first acquisition button; to obtain the phase sequence of the analog AC voltage signal when the phase comparison controller obtains the second acquisition command issued by the maintenance personnel through the second acquisition button; and to obtain the phase comparison command issued by the maintenance personnel through the phase comparison button, the phase comparison controller compares the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal to obtain the phase comparison result.

[0026] A further technical solution is that the phase sequence comparison module is a third phase sequence comparison module, which is used to obtain the phase sequence of the AC voltage signal before maintenance when the phase sequence comparison controller receives the acquisition instruction sent by the phase sequence generator; and to obtain the phase sequence of the analog AC voltage signal when the phase sequence comparison controller receives the analog instruction sent by the phase sequence generator.

[0027] A phase sequence verification system for a power distribution network includes the aforementioned phase sequence verification device, and further includes a phase sequence generation device. The phase sequence generation device includes a phase sequence generation module, which is used to obtain the phase sequence of the AC voltage signal before maintenance and use it as a specified phase sequence, and generate a simulated AC voltage signal with the same phase sequence according to the specified phase sequence.

[0028] A phase verification method for a power distribution network includes a phase verification step, which involves obtaining the phase sequence of an AC voltage signal before maintenance, obtaining the phase sequence of a simulated AC voltage signal, comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal, and obtaining a phase verification result.

[0029] A further technical solution includes a phase sequence generation step, which includes obtaining the phase sequence of the AC voltage signal before the maintenance of the first node, generating a simulated AC voltage signal with the same phase sequence as the AC voltage signal before maintenance during phase verification, and sending it to the second node via the maintenance line; in the phase verification step, obtaining the phase sequence of the AC voltage signal before maintenance at the second node, and obtaining the phase sequence of the simulated AC voltage signal at the second node.

[0030] A phase-matching device for a power distribution network includes a computer-readable storage medium storing a computer program that, when executed by a processor, performs the above steps.

[0031] The beneficial effects of adopting the above technical solution are as follows:

[0032] First, a phase sequence verification device for power distribution networks includes a phase sequence verification module for obtaining the phase sequence of an AC voltage signal before maintenance, obtaining the phase sequence of a simulated AC voltage signal (the simulated AC voltage signal being a signal with the same phase sequence generated from the phase sequence of the AC voltage signal before maintenance), and comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal to obtain the phase sequence verification result. This technical solution improves the efficiency of phase sequence verification by comparing the phase sequence of the AC voltage signal before maintenance with the simulated AC voltage signal.

[0033] Second, a phase sequence verification system for power distribution networks includes the aforementioned phase sequence verification device, and further includes a phase sequence generation device. The phase sequence generation device includes a phase sequence generation module, used to obtain the phase sequence of the AC voltage signal before maintenance and use it as the specified phase sequence, and to generate a simulated AC voltage signal with the same phase sequence according to the specified phase sequence. This technical solution improves the efficiency of phase sequence verification by comparing the phase sequence of the AC voltage signal before maintenance with the simulated AC voltage signal.

[0034] Third, a phase verification method for distribution networks includes a phase verification step: obtaining the phase sequence of the AC voltage signal before maintenance, obtaining the phase sequence of the simulated AC voltage signal, comparing the phase sequence of the AC voltage signal before maintenance and the phase sequence of the simulated AC voltage signal, and obtaining the phase verification result. This technical solution improves the efficiency of phase verification by comparing the phase sequence of the AC voltage signal before maintenance with the simulated AC voltage signal.

[0035] See the detailed implementation section for further description. Attached Figure Description

[0036] Figure 1 This is a block diagram of the first phase sequence generator.

[0037] Figure 2 This is a block diagram of the principle of the second phase sequence generator;

[0038] Figure 3 This is a block diagram of the principle of the third phase sequence generator;

[0039] Figure 4 This is a schematic diagram of the first nuclear phase device;

[0040] Figure 5 This is a schematic diagram of the second nucleus phase device;

[0041] Figure 6 This is a schematic diagram of the third nucleus phase device;

[0042] Figure 7 This is a schematic diagram of the fourth nucleus phase device;

[0043] Figure 8 This is a schematic diagram of the first nuclear phase system;

[0044] Figure 9This is a schematic diagram of the second nucleus phase system;

[0045] Figure 10 This is a schematic diagram of the third nucleus phase system;

[0046] Figure 11 This is a flowchart of the working process of the present invention;

[0047] Figure 12 This is the data flow diagram of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0049] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] Example 1:

[0051] like Figure 4 As shown, this invention discloses a phase-matching device for a power distribution network, comprising a phase-matching module for obtaining the phase sequence of an AC voltage signal before maintenance, obtaining the phase sequence of a simulated AC voltage signal, wherein the simulated AC voltage signal is a signal with a phase sequence consistent with the phase sequence of the AC voltage signal before maintenance, and comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal to obtain a phase-matching result. In this embodiment, the phase-matching module is a hardware product, namely the first phase-matching device.

[0052] First nucleation device:

[0053] like Figure 4 As shown, the first phase acquisition device includes a phase acquisition unit, a communication unit, and a phase controller. The phase acquisition unit is an acquisition unit, and the phase controller is a controller. The phase acquisition unit includes a first phase acquisition unit and a second phase acquisition unit.

[0054] The first phase sequence acquisition unit is wirelessly connected to and communicates with the communication unit of the phase sequence identification device. The second phase sequence acquisition unit is also wirelessly connected to and communicates with the communication unit of the phase sequence identification device. The first phase sequence acquisition unit is used to obtain the phase sequence of the AC voltage signal on the line before maintenance and send it to the phase sequence identification controller. The second phase sequence acquisition unit is used to obtain the phase sequence of the analog AC voltage signal on the line and send it to the phase sequence identification controller. The communication transmission unit of the phase sequence acquisition unit is wirelessly connected to and communicates with the communication unit of the phase sequence identification device.

[0055] The communication unit of the phase comparison device is electrically connected to and communicates with the phase comparison controller. The phase comparison controller is used to obtain the phase sequence from the phase comparison acquisition unit, compare the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal, obtain the phase comparison results, and share them. The analog-to-digital conversion unit of the phase comparison controller is electrically connected to the communication unit of the phase comparison device.

[0056] Example 2:

[0057] like Figure 5 As shown, this invention discloses a phase-matching device for a power distribution network, comprising a phase-matching module for obtaining the phase sequence of an AC voltage signal before maintenance, obtaining the phase sequence of a simulated AC voltage signal, wherein the simulated AC voltage signal is a signal with a phase sequence consistent with the phase sequence of the AC voltage signal before maintenance, and comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal to obtain the phase-matching result. In this embodiment, the phase-matching module is a hardware product, namely, a second phase-matching device.

[0058] Second nucleation device:

[0059] like Figure 5 As shown, the second phase comparison device includes the first phase comparison device. The phase comparison controller of the phase comparison device also includes a first acquisition button, a second acquisition button, and a phase comparison button. The first acquisition button is electrically connected to the control terminal of the processor of the phase comparison controller, the second acquisition button is electrically connected to the control terminal of the processor of the phase comparison controller, and the phase comparison button is electrically connected to the control terminal of the processor of the phase comparison controller.

[0060] The operator presses the first acquisition button to send a first acquisition command to the phase comparison controller's processor. The processor receives the first acquisition command and obtains the phase sequence of the AC voltage signal on the line before maintenance, sent by the phase comparison acquisition unit. The operator then presses the second acquisition button to send a second acquisition command to the phase comparison controller's processor. The processor receives the second acquisition command and obtains the phase sequence of the analog AC voltage signal on the line, sent by the phase comparison acquisition unit. Finally, the operator presses the phase comparison button to send a phase comparison command to the phase comparison controller's processor. The processor receives the phase comparison command, compares the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal, obtains the phase comparison result, and shares it.

[0061] Example 3:

[0062] like Figure 6 As shown, this invention discloses a phase-matching device for power distribution networks, including a phase-matching module for obtaining the phase sequence of an AC voltage signal before maintenance, obtaining the phase sequence of a simulated AC voltage signal (the simulated AC voltage signal being a signal with the same phase sequence generated from the phase sequence of the AC voltage signal before maintenance), and comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal to obtain the phase-matching result. In this embodiment, the phase-matching module is a hardware product, namely, a third phase-matching device.

[0063] Third nucleation device:

[0064] like Figure 6 As shown, the third phase detection device includes the first phase detection device. The phase detection controller of the phase detection device also includes a touch unit. The touch unit is electrically connected to the processor of the phase detection controller. The touch unit itself and the corresponding communication connection technology are existing technologies and will not be described in detail here.

[0065] Compared to the above embodiments, the phase detection controller of the phase detection device can also be connected and communicate with the phase sequence controller, and remotely operate it by receiving the working instructions of the phase sequence controller. Similarities will not be repeated here.

[0066] Example 4:

[0067] like Figure 7 As shown, this invention discloses a phase-matching device for power distribution networks, including a phase-matching module for obtaining the phase sequence of an AC voltage signal before maintenance, obtaining the phase sequence of a simulated AC voltage signal (the simulated AC voltage signal being a signal with the same phase sequence generated from the phase sequence of the AC voltage signal before maintenance), and comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal to obtain the phase-matching result. In this embodiment, the phase-matching module is a hardware product, namely, the fourth phase-matching device.

[0068] Fourth nucleoside unit:

[0069] like Figure 7 As shown, the fourth phase comparison device includes the first phase comparison device and also includes an expression unit. The expression unit is used to obtain and express the phase comparison results shared by the phase comparison controller. The phase comparison controller is connected to and communicates with the expression unit. The expression unit is a liquid crystal display (LCD). The phase comparison controller is electrically connected to and communicates with the LCD. The LCD obtains and displays the phase comparison results shared and sent by the phase comparison controller, so that maintenance personnel can promptly obtain information on whether the phase comparison is correct or incorrect.

[0070] Compared to the above embodiments, the display is an indicator light group or an LED display.

[0071] Compared to the above embodiment, the expresser is a voice player, the phase controller is wired to the voice player, and the voice player obtains and broadcasts the phase analysis results shared by the phase controller.

[0072] Compared to the above embodiments, the expresser is a fixed terminal, such as a desktop computer. The phase analysis controller is wired to and communicates with the desktop computer. The desktop computer obtains and displays the phase analysis results shared and sent by the phase analysis controller.

[0073] Compared to the above embodiments, the expresser is a mobile terminal, such as a handheld terminal. The phase detection controller is wirelessly connected to and communicates with the handheld terminal. The handheld terminal obtains the phase detection results shared and sent by the phase detection controller and displays and broadcasts them.

[0074] Example 5:

[0075] This invention discloses a phase-matching device for power distribution networks, comprising a phase-matching module for obtaining the phase sequence of an AC voltage signal before maintenance, obtaining the phase sequence of a simulated AC voltage signal (the simulated AC voltage signal being a signal with the same phase sequence generated from the phase sequence of the AC voltage signal before maintenance), and comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal to obtain the phase-matching result. In this embodiment, the phase-matching module is a program module, namely the fifth phase-matching device.

[0076] Fifth nucleoside unit:

[0077] The fifth nucleus phase device includes a nucleus phase module, which uses simulation technology and is connected to a data acquisition unit and a computer simulation unit.

[0078] The phase sequence verification module is a program module used to obtain the phase sequence of the AC voltage signal before maintenance on the line, obtain the phase sequence of the simulated AC voltage signal on the line, compare the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal, obtain the phase sequence verification results, and share them.

[0079] Example 6:

[0080] First nucleus system:

[0081] like Figure 8 As shown, the present invention discloses a phase sequence generation system for a power distribution network, comprising a first phase sequence generator, a first phase sequence verification device, a handheld terminal, a control module, a first phase sequence generation module, and a first phase sequence verification module. The first phase sequence generator is installed at the first node of the maintenance task, i.e., the substation side to be maintained, and the first phase sequence verification device is installed at the second node of the maintenance task, i.e., the switch side where phase verification is required. Maintenance personnel carry a handheld terminal, and the first phase sequence generator, the first phase sequence verification device, and the handheld terminal are interconnected.

[0082] like Figure 8As shown, the first phase sequence generator includes a phase sequence collector, a communication unit, a phase sequence controller, and a generator. The analog-to-digital conversion unit of the phase sequence controller is electrically connected to the communication unit of the phase sequence generator. The communication transmission unit of the phase sequence collector is wirelessly connected to and communicates with the communication unit of the phase sequence generator. The communication unit of the phase sequence generator is wirelessly connected to and communicates with the generator.

[0083] like Figure 8 As shown, the first phase identification device includes a first phase acquisition unit, a second phase acquisition unit, a communication unit, and a phase identification controller. The communication transmission unit of the first phase acquisition unit is wirelessly connected to and communicates with the communication unit of the phase identification device. The communication transmission unit of the second phase acquisition unit is wirelessly connected to and communicates with the communication unit of the phase identification device. The analog-to-digital conversion unit of the phase identification controller is electrically connected to the communication unit of the phase identification device.

[0084] like Figure 8 As shown, the communication unit of the first phase sequence generator is wirelessly connected to and communicates with the communication unit of the first phase retrieval device, the handheld terminal is wirelessly connected to and communicates with the communication unit of the first phase sequence generator, and the handheld terminal is wirelessly connected to and communicates with the communication unit of the first phase retrieval device.

[0085] The control module is a program module running on the handheld terminal. When the handheld terminal receives maintenance instructions from the maintenance personnel, it sends the maintenance instructions to the phase sequence controller and the phase detection controller respectively. When the handheld terminal receives simulation instructions from the maintenance personnel, it sends the simulation instructions to the phase sequence controller and the phase detection controller respectively.

[0086] The first phase sequence generation module is a program module running on the phase sequence controller. It is used by the phase sequence collector to obtain the phase sequence of the AC voltage signal before maintenance on the substation side line and send it to the communication unit of the phase sequence generator. When the phase sequence controller receives maintenance instructions from the outside through the communication unit of the phase sequence generator, the phase sequence controller obtains the phase sequence of the AC voltage signal before maintenance from the phase sequence collector through the communication unit of the phase sequence generator. When the phase sequence controller receives analog instructions from the outside through the communication unit of the phase sequence generator, the phase sequence controller sends the phase sequence of the AC voltage signal before maintenance to the generator through the communication unit of the phase sequence generator. The generator obtains the phase sequence of the AC voltage signal before maintenance from the phase sequence controller and uses it as the specified phase sequence. It generates an analog AC voltage signal with the same phase sequence according to the specified phase sequence. The analog AC voltage signal is sent to the switch to be checked for phase through the maintenance line, that is, the switch that needs to be checked for phase.

[0087] The first phase sequence module is a program module running on the phase sequence controller. It is used by the first phase sequence acquisition unit to obtain the phase sequence of the AC voltage signal on the switch side line before maintenance and send it to the phase sequence controller. When the phase sequence controller receives maintenance instructions from the handheld terminal through the communication unit of the phase sequence acquisition unit, it also receives the phase sequence of the AC voltage signal before maintenance from the communication unit of the first phase sequence acquisition unit. When the phase sequence controller receives analog instructions from the handheld terminal through the communication unit of the phase sequence acquisition unit, it also receives the phase sequence of the analog AC voltage signal on the line from the communication unit of the second phase sequence acquisition unit. The phase sequence controller compares the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal to obtain the phase sequence result and shares it for transmission.

[0088] Example 7:

[0089] Second nucleus system:

[0090] like Figure 9 As shown, the present invention discloses a phase detection system for a distribution network, including a second phase sequence generator and a second phase detection device, as well as a second phase sequence generator module and a second phase detection module. The second phase sequence generator is installed at the first node of the maintenance task, i.e., the substation side to be maintained, and the second phase detection device is installed at the second node of the maintenance task, i.e., the switch side that needs phase detection.

[0091] like Figure 9 As shown, the second phase sequence generator includes a phase sequence acquisition unit, a communication unit, a phase sequence controller, and a generator. The analog-to-digital conversion unit of the phase sequence controller is electrically connected to the communication unit of the phase sequence generator. The communication transmission unit of the phase sequence acquisition unit is wirelessly connected to and communicates with the communication unit of the phase sequence generator. The communication unit of the phase sequence generator is wirelessly connected to and communicates with the generator. The phase sequence controller of the phase sequence generator also includes an acquisition button and an analog button. The acquisition button is electrically connected to the control terminal of the processor of the phase sequence controller, and the analog button is electrically connected to the control terminal of the processor of the phase sequence controller.

[0092] like Figure 9 As shown, the second phase comparison device includes a first phase comparison acquisition unit, a second phase comparison acquisition unit, a communication unit, and a phase comparison controller. The communication transmission unit of the first phase comparison acquisition unit is wirelessly connected to and communicates with the communication unit of the phase comparison device. The communication transmission unit of the second phase comparison acquisition unit is also wirelessly connected to and communicates with the communication unit of the phase comparison device. The analog-to-digital conversion unit of the phase comparison controller is electrically connected to the communication unit of the phase comparison device. The phase comparison controller of the second phase comparison device also includes a first acquisition button, a second acquisition button, and a phase comparison button. The first acquisition button is electrically connected to the control terminal of the processor of the phase comparison controller. The second acquisition button is also electrically connected to the control terminal of the processor of the phase comparison controller. The phase comparison button is also electrically connected to the control terminal of the processor of the phase comparison controller.

[0093] The second phase sequence generation module is a program module running on the phase sequence controller. It is used by the phase sequence collector to obtain the phase sequence of the AC voltage signal before maintenance on the substation side line and send it to the communication unit of the phase sequence generator. When the phase sequence controller receives the acquisition command issued by the maintenance personnel through the acquisition button, the phase sequence controller obtains the phase sequence of the AC voltage signal before maintenance sent by the phase sequence collector through the communication unit of the phase sequence generator. When the phase sequence controller receives the simulation command issued by the maintenance personnel through the simulation button, the phase sequence controller sends the phase sequence of the AC voltage signal before maintenance to the generator through the communication unit of the phase sequence generator. The generator obtains the phase sequence of the AC voltage signal before maintenance sent by the phase sequence controller and uses it as the specified phase sequence. It generates a simulated AC voltage signal with the same phase sequence according to the specified phase sequence. The simulated AC voltage signal is sent to the switch to be checked for phase through the maintenance line, that is, the switch that needs to be checked for phase.

[0094] The second phase matching module is a program module running on the phase matching controller. It is used by the first phase matching acquisition unit to obtain the phase sequence of the AC voltage signal on the switch side line before maintenance and send it to the phase matching controller. When the phase matching controller receives the first acquisition command issued by the maintenance personnel through the first acquisition button, the phase matching controller obtains the phase sequence of the AC voltage signal before maintenance sent by the communication transmission unit of the first phase matching acquisition unit through the communication unit of the phase matching device. When the phase matching controller receives the second acquisition command issued by the maintenance personnel through the second acquisition button, the phase matching controller obtains the phase sequence of the analog AC voltage signal on the line sent by the communication transmission unit of the second phase matching acquisition unit through the communication unit of the phase matching device. When the phase matching controller receives the phase matching command issued by the maintenance personnel through the phase matching button, the phase matching controller compares the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal, obtains the phase matching result, and shares and sends it.

[0095] Example 8:

[0096] Third nucleus system:

[0097] like Figure 10 As shown, the present invention discloses a phase detection system for a power distribution network, including a third phase sequence generator and a third phase detection device, as well as a third phase sequence generator module and a third phase detection module. The third phase sequence generator is installed at the first node of the maintenance task, i.e., the substation side to be maintained, and the third phase detection device is installed at the second node of the maintenance task, i.e., the switch side that needs phase detection.

[0098] like Figure 10As shown, the third phase sequence generator includes a phase sequence acquisition unit, a communication unit, a phase sequence controller, and a generator. The analog-to-digital conversion unit of the phase sequence controller is electrically connected to the communication unit of the phase sequence generator. The communication transmission unit of the phase sequence acquisition unit is wirelessly connected to and communicates with the communication unit of the phase sequence generator. The communication unit of the phase sequence generator is wirelessly connected to and communicates with the generator. The phase sequence controller of the phase sequence generator also includes a touch unit, which is a touch screen. The touch unit is electrically connected to and communicates with the processor of the phase sequence controller.

[0099] like Figure 10 As shown, the third phase grading device includes a first phase grading unit, a second phase grading unit, a communication unit, and a phase grading controller. The communication transmitting unit of the first phase grading unit is wirelessly connected to and communicates with the communication unit of the phase grading device. The communication transmitting unit of the second phase grading unit is also wirelessly connected to and communicates with the communication unit of the phase grading device. The analog-to-digital conversion unit of the phase grading controller is electrically connected to the communication unit of the phase grading device. The phase grading controller of the phase grading device also includes a touch unit, which is a touch screen. The touch unit is electrically connected to and communicates with the processor of the phase grading controller.

[0100] like Figure 10 As shown, the communication unit of the third phase sequence generator is wired to and communicates with the communication unit of the third phase sequence generator.

[0101] The third phase sequence generation module is a program module running on the phase sequence controller. It is used by the phase sequence acquisition unit to obtain the phase sequence of the AC voltage signal before maintenance on the substation side line and send it to the communication unit of the phase sequence generation device. When the phase sequence controller receives the acquisition command from the maintenance personnel via the touchscreen, it sends the acquisition command to the phase verification device through the communication unit of the phase sequence generation device. The phase sequence controller then obtains the phase sequence of the AC voltage signal before maintenance from the phase sequence acquisition unit through the communication unit of the phase sequence generation device. When the phase sequence controller receives the analog command from the maintenance personnel via the touchscreen, it uses the phase sequence... The communication unit of the generator sends the analog command to the phase sequence controller. The phase sequence controller sends the phase sequence of the AC voltage signal before maintenance to the generator via the communication unit of the phase sequence generator. The generator obtains the phase sequence of the AC voltage signal before maintenance from the phase sequence controller and uses it as the specified phase sequence. It generates an analog AC voltage signal with the same phase sequence as the specified phase sequence. The analog AC voltage signal is sent to the switch to be phase-checked via the line after maintenance, i.e., the switch that needs phase checking. When the phase sequence controller obtains the phase checking result shared by the phase sequence controller through the communication unit of the phase sequence generator, the phase sequence controller's touch screen displays the phase checking result.

[0102] The third phase matching module is a program module running on the phase matching controller. It is used by the first phase matching acquisition unit to obtain the phase sequence of the AC voltage signal on the switch side line before maintenance and send it to the phase matching controller. When the phase matching controller receives the acquisition command from the phase sequence generator through the communication unit of the phase matching device, the phase matching controller receives the phase sequence of the AC voltage signal before maintenance from the communication transmission unit of the first phase matching acquisition unit through the communication unit of the phase matching device. When the phase matching controller receives the analog command from the phase sequence generator through the communication unit of the phase matching device, the phase matching controller receives the phase sequence of the analog AC voltage signal on the line from the communication transmission unit of the second phase matching acquisition unit through the communication unit of the phase matching device. The phase matching controller compares the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal, obtains the phase matching result, and shares and sends it. The phase matching result is displayed on the touch screen of the phase matching controller.

[0103] Example 9:

[0104] This invention discloses a phase verification method for power distribution networks. Based on Embodiment 1, the method includes the phase verification steps of obtaining the phase sequence of the AC voltage signal before maintenance, obtaining the phase sequence of the simulated AC voltage signal, comparing the phase sequence of the AC voltage signal before maintenance and the phase sequence of the simulated AC voltage signal, and obtaining the phase verification result.

[0105] Compared to Example 9, the nucleation step is implemented based on any of the above-described nucleation devices.

[0106] Compared to Example 9, the nucleation step is implemented based on any of the above-described nucleation systems.

[0107] Example 10:

[0108] This invention discloses a phase verification method for power distribution networks, based on the phase verification system of Embodiment 6, including a phase sequence generation step and a phase verification step.

[0109] Phase sequence generation steps: The phase sequence generator obtains the phase sequence of the AC voltage signal before maintenance at the first node. During phase verification, the phase sequence generator generates an analog AC voltage signal with the same phase sequence as the AC voltage signal before maintenance and sends it to the second node via the maintenance line.

[0110] Phase verification steps: The phase verification device obtains the phase sequence of the AC voltage signal before maintenance at the second node. During phase verification, the phase verification device obtains the phase sequence of the simulated AC voltage signal at the second node, compares the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal, obtains the phase verification result, and shares and sends it.

[0111] Compared to Example 10, the phase sequence generation step and the phase nucleation step are implemented based on any of the above-described nucleation systems.

[0112] Example 11:

[0113] The present invention discloses a phase detection device for a power distribution network, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of Embodiment 9.

[0114] Example 12:

[0115] The present invention discloses a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps in Embodiment 9.

[0116] Compared to the above embodiments, the program module can also be a hardware module made using existing logic operation technology to implement the corresponding logic operation steps, communication steps and control steps, thereby realizing the above-mentioned corresponding steps. The logic operation unit is existing technology and will not be described in detail here.

[0117] The corresponding supporting products are as follows:

[0118] First phase sequence generator:

[0119] like Figure 1 As shown, a phase sequence generator for a power distribution network includes a phase sequence collector, a communication unit, a phase sequence controller, and a generator. The phase sequence collector is connected to and communicates with the communication unit of the phase sequence generator. The communication unit of the phase sequence generator is connected to and communicates with the phase sequence controller. The communication unit of the phase sequence generator is connected to and communicates with the generator. The phase sequence collector is used to obtain the phase sequence of the AC voltage signal before maintenance on the line and send it to the phase sequence controller. The phase sequence controller is used to obtain the phase sequence sent by the phase sequence collector and send it to the generator. The generator is used to obtain the phase sequence sent by the phase sequence controller and use it as the specified phase sequence to generate an analog AC voltage signal with the same phase sequence.

[0120] Among them, the phase sequence collector is the collector, and the phase sequence controller is the controller.

[0121] The data acquisition unit includes a processor, an operational amplifier unit, a trigger unit, a data acquisition unit, and a communication transmission unit. The processor of the data acquisition unit is electrically connected to the operational amplifier unit, the trigger unit, and the data acquisition unit separately. The operational amplifier unit is electrically connected to the data acquisition unit and the communication transmission unit separately. The trigger unit is electrically connected to the data acquisition unit. The data acquisition unit itself is existing technology and will not be described in detail here.

[0122] The controller includes a processor, a memory, and an analog-to-digital converter. The processor of the controller is electrically connected to the memory and the analog-to-digital converter separately. The controller itself is existing technology and will not be described in detail.

[0123] The generator itself is existing technology and will not be discussed further.

[0124] like Figure 1As shown, the analog-to-digital conversion unit of the phase sequence controller is electrically connected to the communication unit of the phase sequence generator, the communication transmission unit of the phase sequence collector is wirelessly connected to and communicates with the communication unit of the phase sequence generator, and the communication unit of the phase sequence generator is wirelessly connected to and communicates with the generator.

[0125] Second phase sequence generator:

[0126] like Figure 2 As shown, a phase sequence generator for a power distribution network includes a first phase sequence generator. The phase sequence controller of the phase sequence generator further includes a data acquisition button and an analog button. The data acquisition button is electrically connected to the control terminal of the processor of the phase sequence controller, and the analog button is electrically connected to the control terminal of the processor of the phase sequence controller.

[0127] The operator sends a data acquisition command to the phase sequence controller's processor by pressing the acquisition button. The processor receives the acquisition command and uses the phase sequence from the phase sequence acquisition unit as the specified phase sequence. Similarly, the operator sends a simulation command to the phase sequence controller's processor by pressing the simulation button. The processor receives the simulation command and sends the specified phase sequence to the generator. The generator receives the specified phase sequence and generates a consistent analog AC voltage signal.

[0128] In this system, the control terminal of the phase sequence controller's processor is connected to a pull-up resistor, the control terminal of the processor is grounded via a data acquisition button, and the control terminal of the processor is grounded via an analog button. Pressing the button pulls the corresponding control terminal low, enabling communication with the processor.

[0129] Third phase sequence generator:

[0130] like Figure 3 As shown, a phase sequence generating device for a power distribution network includes a first phase sequence generating device, and the phase sequence controller of the phase sequence generating device further includes a touch unit, which is electrically connected to the processor of the phase sequence controller.

[0131] The operator transmits acquisition commands to the phase sequence controller's processor via a touchscreen. The phase sequence controller's processor receives the acquisition commands and uses the phase sequence from the phase sequence acquisition unit as the designated phase sequence. The operator also transmits analog commands to the phase sequence controller's processor via the touchscreen. The phase sequence controller's processor receives the analog commands and sends the designated phase sequence to the generator. The generator receives the designated phase sequence and generates an analog AC voltage signal with the same phase sequence.

[0132] The touch unit is a touch screen. The touch unit itself and the corresponding communication connection technology are existing technologies and will not be described in detail here.

[0133] Fourth phase sequence generator:

[0134] A phase sequence generator for power distribution networks includes a phase sequence generation module, employs simulation technology, and is connected to a data acquisition unit and a computer simulation device.

[0135] The phase sequence generation module is a program module used to obtain the phase sequence of the AC voltage signal before maintenance on the line, and to generate a simulated AC voltage signal with the same phase sequence through a computer program.

[0136] Methods for phase sequence generation:

[0137] Based on any of the above phase sequence generating devices, the phase sequence of the AC voltage signal before maintenance on the line is obtained and a simulated AC voltage signal with the same phase sequence is generated.

[0138] Methods for phase sequence generation and nucleation:

[0139] The existing infrastructure within the area to be de-energized includes substations and lines to be inspected, as well as switches that require phase verification. Substations, lines, and switches are connected in sequence.

[0140] The phase sequence generator is installed at the first node of the maintenance task, i.e., the substation side to be maintained, and the signal analyzer is installed at the second node of the maintenance task, i.e., the switch side where phase verification is required. The phase sequence generator obtains the phase sequence of the AC voltage signal on the line before maintenance, and the signal analyzer obtains the phase sequence of the AC voltage signal on the line before maintenance. After maintenance is completed, the phase sequence generator generates a simulated AC voltage signal with the same phase sequence as the AC voltage signal to be maintained. The simulated AC voltage signal is sent to the switch where phase verification is required via the maintained line. The signal analyzer obtains the phase sequence of the simulated AC voltage signal on the maintained line and compares the phase sequence of the AC voltage signal to be maintained with the phase sequence of the simulated AC voltage signal to obtain the phase verification result.

[0141] Applications of phase sequence generators:

[0142] The phase sequence of the AC voltage signal before maintenance on the line is obtained and used to generate a simulated AC voltage signal with the same phase sequence. The simulated AC voltage signal is used as a reference signal for phase matching in order to proceed with the next phase matching step.

[0143] Brief introduction of this technology research and development project:

[0144] The technological achievements of this project include two types of hardware products: a phase sequence generator and a phase merging device. Multiple technical solutions were designed for each type of hardware product. The phase sequence generator and the phase merging device together form a phase merging system, and different combinations of these devices create multiple phase merging systems. The core technologies are described below.

[0145] Phase sequence generator:

[0146] The phase sequence generator includes a phase sequence acquisition unit, a communication unit, a phase sequence controller, and a generator. The phase sequence acquisition unit is connected to and communicates with the communication unit of the phase sequence generator. The communication unit of the phase sequence generator is connected to and communicates with the phase sequence controller. The communication unit of the phase sequence generator is also connected to and communicates with the generator. The phase sequence acquisition unit obtains the phase sequence of the AC voltage signal before line maintenance and sends it to the phase sequence controller. The phase sequence controller obtains the phase sequence from the phase sequence acquisition unit and sends it to the generator. The generator obtains the phase sequence from the phase sequence controller and uses it as the specified phase sequence to generate a simulated AC voltage signal with the same phase sequence. The phase sequence generator obtains the phase sequence of the AC voltage signal before line maintenance and generates a simulated AC voltage signal with the same phase sequence. The simulated AC voltage signal serves as a reference signal for phase verification. The phase sequence acquisition unit is a collector, and the phase sequence controller is a controller.

[0147] In addition, the phase sequence controller of the phase sequence generator may also include a data acquisition button and an analog button. The data acquisition button is electrically connected to the control terminal of the phase sequence controller's processor, and the analog button is also electrically connected to the control terminal of the phase sequence controller's processor. By pressing the data acquisition button, the operator sends a data acquisition command to the phase sequence controller's processor. The processor receives the data acquisition command and obtains the phase sequence from the phase sequence acquisition unit, using it as the specified phase sequence. Similarly, by pressing the analog button, the operator sends a simulation command to the phase sequence controller's processor. The processor receives the simulation command and sends the specified phase sequence to the generator. The generator obtains the specified phase sequence and generates an analog AC voltage signal with the same phase sequence.

[0148] In addition, the phase sequence controller of the phase sequence generator may also include a touch unit. The touch unit is electrically connected to the control terminal of the phase sequence controller's processor. The operator uses the touch unit to send acquisition commands to the phase sequence controller's processor. The processor receives the acquisition commands and uses the phase sequence from the phase sequence acquisition unit as the designated phase sequence. The operator also uses the touch unit to send analog commands to the phase sequence controller's processor. The processor receives the analog commands and sends the designated phase sequence to the generator. The generator receives the designated phase sequence and generates an analog AC voltage signal with the same phase sequence. The touch unit can be a touchscreen or a button assembly with a display. The touch unit itself and the corresponding communication connection technology are existing technologies and will not be described in detail here.

[0149] In addition, the phase sequence controller of the phase sequence generator can also connect and communicate with other external controllers, and remotely operate it by receiving operating instructions from other controllers. Other controllers send acquisition instructions to the processor of the phase sequence controller. The processor of the phase sequence controller receives the acquisition instructions and obtains the phase sequence from the phase sequence acquisition unit as the specified phase sequence. Other controllers also send analog instructions to the processor of the phase sequence controller. The processor of the phase sequence controller receives the analog instructions and sends the specified phase sequence to the generator. The generator obtains the specified phase sequence and generates an analog AC voltage signal with the same phase sequence.

[0150] The phase sequence generator's phase sequence controller is wired to other external controllers. Alternatively, the phase sequence generator's phase sequence controller can also be wirelessly connected to other external controllers.

[0151] In addition, the communication transmission unit of the phase sequence acquisition device and the communication unit of the phase sequence generator can be connected by a wire, and the communication unit of the phase sequence generator and the generator can also be connected by a wire.

[0152] Alternatively, a signal analyzer can be used to obtain the phase sequence of the AC voltage signal before maintenance on the line, and the phase sequence of the simulated AC voltage signal on the line. By comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal, the phase sequence comparison results can be obtained.

[0153] The invention of the phase sequence generator lies in:

[0154] 1. Combination Invention: The combination of phase sequence acquisition device, communication unit, phase sequence controller and generator is proposed for the first time. The phase sequence acquisition device, communication unit, phase sequence controller and generator themselves and the corresponding communication connection technology are existing technologies and will not be described in detail.

[0155] 2. Application of the invention: to obtain the phase sequence of the AC voltage signal before maintenance on the line and use it to generate a simulated AC voltage signal with the same phase sequence, and use the simulated AC voltage signal as a reference signal for phase comparison, so as to carry out the next step of phase comparison.

[0156] Nucleation apparatus:

[0157] The phase comparison device includes a phase comparison acquisition unit, a communication unit, and a phase comparison controller. The phase comparison acquisition unit is connected to and communicates with the communication unit of the phase comparison device, and the communication unit of the phase comparison device is connected to and communicates with the phase comparison controller. The phase comparison acquisition unit is used to obtain the phase sequence of the AC voltage signal on the line before maintenance and send it to the phase comparison controller. The phase comparison acquisition unit is also used to obtain the phase sequence of the simulated AC voltage signal on the line before maintenance and send it to the phase comparison controller. The phase comparison controller is used to obtain the phase sequence sent by the phase comparison acquisition unit, compare the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal, and obtain the phase comparison result. The phase comparison acquisition unit is a collector, and the phase comparison controller is a controller.

[0158] In addition, the phase sequence acquisition unit includes a first phase sequence acquisition unit and a second phase sequence acquisition unit. The first phase sequence acquisition unit is connected to and communicates with the communication unit of the phase sequence acquisition device, and the second phase sequence acquisition unit is connected to and communicates with the communication unit of the phase sequence acquisition device. The first phase sequence acquisition unit is used to obtain the phase sequence of the AC voltage signal on the line before maintenance and send it to the phase sequence controller. The second phase sequence acquisition unit is used to obtain the phase sequence of the analog AC voltage signal on the line and send it to the phase sequence controller.

[0159] The analog-to-digital conversion unit of the phase detection controller is electrically connected to the communication unit of the phase detection device, and the communication transmission unit of the phase detection acquisition unit is wirelessly connected to and communicates with the communication unit of the phase detection device.

[0160] In addition, the phase comparison controller of the phase comparison device may also include a first acquisition button, a second acquisition button, and a phase comparison button. The first acquisition button is electrically connected to the control terminal of the phase comparison controller's processor, the second acquisition button is electrically connected to the control terminal of the phase comparison controller's processor, and the phase comparison button is electrically connected to the control terminal of the phase comparison controller's processor. The operator presses the first acquisition button to send a first acquisition command to the phase comparison controller's processor. The phase comparison controller's processor receives the first acquisition command and obtains the phase sequence of the AC voltage signal on the line before maintenance, sent by the phase comparison acquisition device. The operator presses the second acquisition button to send a second acquisition command to the phase comparison controller's processor. The phase comparison controller's processor receives the second acquisition command and obtains the phase sequence of the analog AC voltage signal on the line, sent by the phase comparison acquisition device. The operator presses the phase comparison button to send a phase comparison command to the phase comparison controller's processor. The phase comparison controller's processor receives the phase comparison command and compares the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal to obtain the phase comparison result.

[0161] In addition, the phase controller of the phase device may also include a touch unit, which is electrically connected to the control terminal of the phase controller's processor. The touch unit itself and the corresponding communication connection technology are existing technologies and will not be described in detail here.

[0162] In addition, the phase controller of the phase fusion device can also be connected and communicate with other external controllers, and remotely operate it by receiving working instructions from other controllers. Similarities will not be elaborated further.

[0163] In addition, the communication transmission unit of the phase acquisition device and the communication unit of the phase acquisition device can also be connected by wire.

[0164] The invention of the nucleation device lies in:

[0165] 1. Combination invention: The combination of the first phase acquisition device, the second phase acquisition device, the communication unit and the phase controller is proposed for the first time. The phase acquisition device, the communication unit and the phase controller themselves and the corresponding communication connection technology are existing technologies and will not be described in detail.

[0166] 2. Method Invention: Obtain the phase sequence of the AC voltage signal before maintenance on the line, obtain the phase sequence of the simulated AC voltage signal on the line, compare the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal, and obtain the phase comparison result.

[0167] The concept of this application:

[0168] In the existing technology, before large-scale comprehensive maintenance and fault recovery of power distribution lines, phase comparison is carried out on both sides of the switch while energized, and a wireless phase comparison instrument is used. If the phase comparison result is incorrect, the power needs to be repeatedly shut down to perform phase replacement work on the power distribution line.

[0169] The inventor's idea is that if the phase of the power distribution line can be recorded before a power outage, and after maintenance is completed and before energization is restored, the temporarily stored phase can be reloaded onto the power distribution line for phase verification. This would avoid repeated power outages and reduce the safety hazards associated with them. The specific phase verification steps are as follows: if the phase is correct, a second phase verification can be performed before energization; if the phase is incorrect, a phase swap is performed, and a second phase verification is also performed before energization. The core of this work lies in how to perform phase verification under de-energized conditions.

[0170] The technical problem to be solved:

[0171] Phase verification work during power outages in power distribution network operation and maintenance.

[0172] Technical contributions:

[0173] Before large-scale power outages and comprehensive maintenance, or before large-scale power outages due to complex faults, this device collects the phase sequence signal of the 10kV substation outlet bay bus and temporarily stores it in the generator memory module B. At the same time, before the power outage, it collects the phase sequence of the positions that need to be checked before power transmission and temporarily stores it in the generator memory module A. The phase sequence position can be one or more positions.

[0174] After the work is completed and before power transmission is started, a phase generator is used to convert the phase sequence signal in memory module B into an electrical signal and apply it to the beginning of the distribution line, i.e., the position of the 10kV substation outlet bay bus. The phase sequence signal at the position where phase verification is required is collected and temporarily stored in the generator memory module A. The phase sequence of the two collections in memory module A is compared, and the phase verification is completed within the power outage time range. This reduces the need for repeated power outages and phase switching work caused by phase sequence errors due to human error.

[0175] Of course, before power is supplied, the phase needs to be re-energized at the switch position as a final safety guarantee barrier.

[0176] Technical solution description:

[0177] The technical solution of this application relates to the technical fields of power distribution network operation and maintenance and wireless phase matching.

[0178] like Figure 12 As shown, a 10kV substation is undergoing maintenance work with a power outage. The outage area extends from the substation's outlet to pole-mounted switch A. Lines downstream of pole-mounted switch A are connected by other 10kV lines. The tie switch A0 is in the closed position, and pole-mounted switch A is in the open position. During the work within the outage protection area, human factors may cause the phase on the left side of pole-mounted switch A to differ from the original phase before the outage. These human factors include disconnecting or reconnecting distribution lines and replacing switches. After the work within the outage protection area is completed, the substation's internal switches are closed, and the area from the substation outlet to the left side of pole-mounted switch A is energized. According to current technology, a phase check should be performed on both sides of pole-mounted switch A. If the phases on both sides of pole-mounted switch A are consistent, the power supply operation ends. If the phases are inconsistent, the station outlet switch needs to be reopened. After the power outage, appropriate protection measures should be taken, and the phase switching work should be carried out at the power distribution line connection on the left side of switch A. After the phase switching work is completed, the station outlet switch should be closed again, and the phase verification work should be carried out again on both sides of pole-mounted switch A. This process increases the power outage time and labor costs.

[0179] like Figure 11As shown, the inventors have found a technical approach and proposed a novel intelligent phase temporary storage generator. This device is equipped with at least two or more sets of devices that also have acquisition and transmission functions. The phase sequence signal of a 10kV line is acquired and stored internally. The acquisition positions of switch A in both cases are to the left of switch A. This phase sequence signal is a high-voltage-to-weak-voltage sine wave, and the left side of switch A corresponds to the power supply direction. The stored signal is then converted into a set of sine wave signals with phase characteristics, specifically a weak-voltage sine wave followed by a high-voltage sine wave.

[0180] like Figure 12 As shown, before opening the station's internal switches after opening pole-mounted switch A or before power outage maintenance, the phase sequence signal of pole-mounted switch A is first collected. Before opening the station's internal switches after opening pole-mounted switch A, pole-mounted switch A is in the open position, with both sides energized. Before power outage maintenance, pole-mounted switch A is in the closed position, with both sides energized. The phase sequence signal of pole-mounted switch A, i.e., the phase sequence signal on the power outage side, is collected first, following the actual yellow, green, and red color sequence on site. This signal is a three-phase sinusoidal signal with a phase angle difference of 120°.

[0181] like Figure 12 As shown, the phase sequence signal is temporarily stored in storage area 1 of generator memory module A, and then the phase sequence signal of the outgoing line side of the 10kV substation bus bay is acquired and temporarily stored in generator memory module B. This phase sequence signal is acquired in the actual yellow, green, and red color order on site, and this signal is a three-phase sinusoidal signal with a phase angle difference of 120°.

[0182] like Figure 12 As shown, after the work is completed and before commissioning, a phase generator is used to convert the phase sequence signal in memory module B and apply it to the distribution line outlet, i.e., the original acquisition position. The phase sequence signal at this time is acquired on the left side of pole-mounted switch A and temporarily stored in storage area 2 of generator memory module A. The phase sequence of the two times in memory module A is compared to complete the phase verification work during the power outage process, ensuring that the phase on both sides of pole-mounted switch A is accurate at this time. After the above process is completed, repeated power outages in the substation can be effectively avoided, saving time and manpower costs, and also avoiding some unnecessary safety issues.

[0183] like Figure 12 As shown, the phase sequence signal of the 10kV line is acquired and stored internally in the instrument. This signal is a high-voltage-to-weak-voltage sine wave. The stored signal is converted into a set of sine wave signals with phase characteristics, which is a weak-voltage sine wave-to-high-voltage sine wave. The signal generated up to this point by the phase buffer generator B is also acquired; this signal is a strong-voltage sine wave-to-weak-voltage sine wave.

[0184] To further ensure safety, a second phase check must be performed while the power is on before power is supplied.

[0185] The phase sequence signal acquisition element can be a similar basic communication element to a wireless phase comparator, except that storage and transmission elements are added to the original element. Each set of intelligent phase temporary storage generator consists of two temporary storage generators with the same acquisition and transmission functions.

[0186] After this application had been running internally for a period of time, the beneficial aspects reported by on-site technicians were:

[0187] During comprehensive maintenance of large-scale power outages and large-scale power outages due to complex faults, the need for repeated power outages and phase switching work caused by phase sequence errors due to human error is reduced, thus efficiently reducing labor and electricity costs.

[0188] Currently, the technical solution of this invention has undergone pilot testing, which is a small-scale trial of the product before large-scale mass production. After the pilot testing was completed, a user survey was conducted on a small scale, and the survey results showed that user satisfaction was high. Now, preparations have begun for the formal production and industrialization of the product (including intellectual property risk warning surveys).

Claims

1. A phase verification method for power distribution networks, characterized in that: Includes the following steps, The phase sequence generator is installed at the first node of the maintenance task, and the signal analyzer is installed at the second node of the maintenance task. The first node is the substation side to be maintained, and the second node is the switch side that needs to be phase checked. In the phase sequence generation step, the phase sequence generator obtains the phase sequence of the AC voltage signal before maintenance. After maintenance is completed, during phase verification, a simulated AC voltage signal with the same phase sequence as the AC voltage signal before maintenance is generated and sent to the second node via the maintenance line. In the phase verification step, the signal analyzer obtains the phase sequence of the AC voltage signal before maintenance, and obtains the phase sequence of the simulated AC voltage signal during phase verification. By comparing the phase sequence of the AC voltage signal before maintenance with the phase sequence of the simulated AC voltage signal, the phase verification result is obtained.

2. A phase comparison device for a power distribution network, used in the phase comparison method for a power distribution network as described in claim 1, characterized in that: It includes a phase sequence matching module, which is used to obtain the phase sequence of the AC voltage signal before maintenance and the phase sequence of the simulated AC voltage signal. The simulated AC voltage signal is a signal with the same phase sequence generated by the phase sequence of the AC voltage signal before maintenance. The phase sequence of the AC voltage signal before maintenance and the phase sequence of the simulated AC voltage signal are compared to obtain the phase sequence matching result.

3. A phase verification device for a power distribution network according to claim 2, characterized in that: The phase comparison module includes a phase comparison acquisition unit, a communication unit, and a phase comparison controller. The phase comparison acquisition unit includes a first phase comparison acquisition unit and a second phase comparison acquisition unit. The phase comparison controller is connected to and communicates with the communication unit of the phase comparison device. The first phase comparison acquisition unit is connected to and communicates with the communication unit of the phase comparison device. The second phase comparison acquisition unit is connected to and communicates with the communication unit of the phase comparison device. The first phase comparison acquisition unit is used to obtain the phase sequence of the AC voltage signal before maintenance on the line and send it to the phase comparison controller. The second phase comparison acquisition unit is used to obtain the phase sequence of the analog AC voltage signal on the line and send it to the phase comparison controller. The phase comparison controller is used to obtain the phase sequence sent by the phase comparison acquisition unit, compare the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal, and obtain the phase comparison result.

4. A phase verification device for a power distribution network according to claim 3, characterized in that: It also includes an expresser, which is used to obtain and express the nuclear phase results shared by the nuclear phase controller. The nuclear phase controller is connected to and communicates with the expresser. The nuclear phase controller includes a first acquisition button, a second acquisition button and a nuclear phase button. The first acquisition button is electrically connected to the nuclear phase controller, the second acquisition button is electrically connected to the nuclear phase controller and the nuclear phase button is electrically connected to the nuclear phase controller. Alternatively, the nuclear phase controller includes a touch unit, which is electrically connected to the nuclear phase controller.

5. A phase verification device for a power distribution network according to claim 3, characterized in that: The phase matching module also includes a phase matching program module, which is used by the first phase matching acquisition unit to obtain the phase sequence of the AC voltage signal before maintenance on the line and send it to the phase matching controller, the second phase matching acquisition unit to obtain the phase sequence of the analog AC voltage signal on the line and send it to the phase matching controller, and the phase matching controller to obtain the phase sequence of the AC voltage signal before maintenance and the phase sequence of the analog AC voltage signal and then compare them to obtain the phase matching result.

6. A phase verification device for a power distribution network according to claim 5, characterized in that: The phase comparison module is also used to obtain the phase sequence of the AC voltage signal before maintenance when the phase comparison controller receives the first working instruction, and to obtain the phase sequence of the analog AC voltage signal when the phase comparison controller receives the second working instruction, and to share and send the phase comparison results.

7. A phase verification device for a power distribution network according to claim 6, characterized in that: The phase sequence comparison module is a first phase sequence comparison module, used to obtain the phase sequence of the AC voltage signal before maintenance when the phase sequence comparison controller receives a maintenance command from the handheld terminal, and to obtain the phase sequence of the analog AC voltage signal when the phase sequence comparison controller receives an analog command from the handheld terminal; or the phase sequence comparison module is a second phase sequence comparison module, used to obtain the phase sequence of the AC voltage signal before maintenance when the phase sequence comparison controller receives a first acquisition command from the maintenance personnel via the first acquisition button, and to obtain the phase sequence of the AC voltage signal before maintenance when the phase sequence comparison controller receives a second acquisition command from the maintenance personnel via the second acquisition button. The phase sequence controller receives the phase sequence of the analog AC voltage signal from the phase sequence generator. When the phase sequence controller receives the phase sequence command from the maintenance personnel via the phase sequence button, it compares the phase sequence of the AC voltage signal before maintenance with the phase sequence of the analog AC voltage signal to obtain the phase sequence result. Alternatively, the phase sequence controller can be a third phase sequence controller, used to obtain the phase sequence of the AC voltage signal before maintenance when it receives the acquisition command from the phase sequence generator, and to obtain the phase sequence of the analog AC voltage signal when it receives the analog command from the phase sequence generator.

8. A phase-reinforced distribution network system, characterized in that: The device includes a phase sequence generator for a power distribution network as described in any one of claims 2 to 7, and further includes a phase sequence generator module for obtaining the phase sequence of the AC voltage signal before maintenance and generating a simulated AC voltage signal with the same phase sequence.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program that, when executed by a processor, implements the corresponding steps in the phase identification method for a power distribution network as described in claim 1.

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