Electromagnetic primary and secondary fusion device and method

Abstract

The invention belongs to the technical field of primary and secondary fusion in the power industry, and particularly relates to an electromagnetic type primary and secondary fusion device and method, the device comprises a standard pole-mounted circuit breaker, a fusion PT and a fusion FTU, and the method comprises a method of using the electromagnetic type primary and secondary fusion device to carry out graph model checking, distributed FA and precise positioning. Real-time topology identification of a 10kV line is realized based on a medium-voltage carrier communication system, distributed FA is realized by adopting a medium-voltage carrier low-delay peer-to-peer communication technology, and accurate fault positioning is realized by adopting a double-end traveling wave positioning technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of primary and secondary fusion in the electric power industry, and specifically relates to an electromagnetic primary and secondary fusion device and method. Background Art

[0002] As the reliability requirements of distribution network power supply are increasing, the functional requirements for distribution automation terminals are also increasing. In recent years, distribution automation has developed rapidly, and more and more primary and secondary integrated intelligent switches are being used, which is the trend of intelligent distribution network construction. The primary and secondary integrated intelligent switches of distribution network optimize the coordination between primary and secondary equipment and reduce the on-site workload of installation and operation and maintenance personnel.

[0003] Automation is the main feature of smart grids, and the main content of medium-voltage system automation is distribution automation. The main contents of distribution automation include substation automation and feeder automation. Substation automation involves fewer devices, simple communication, relatively centralized, and high reliability. It is now possible to realize intelligent unmanned substations. However, feeder automation involves a large number of devices, the communication method varies according to the specific conditions of the line, and the radial dispersion and long distance. Due to insufficient understanding and insufficient attention to feeder fault diagnosis, regional isolation and power supply restoration, the problem of low reliability of medium-voltage distribution network feeders has always existed.

[0004] At present, when a line fails, a large number of operation and maintenance personnel are required to patrol the line to find the fault point and handle it. The distribution network lines cover many mountainous areas and the line radius is long, which leads to a significant increase in patrol costs, and the types of faults vary greatly. At present, most patents are for a single function, and traditional primary and secondary fusion equipment does not have medium-voltage carrier communication function and cannot achieve real-time topology identification. Summary of the invention

[0005] In view of the various shortcomings of the existing technology, the inventors have researched and designed an electromagnetic primary-secondary fusion device and method in long-term practice. Based on the medium-voltage carrier communication system, real-time topology identification of 10kV lines is realized, medium-voltage carrier low-latency peer-to-peer communication technology is used to realize distributed FA (i.e. distributed fault analysis), and dual-end traveling wave positioning technology is used to realize accurate fault positioning.

[0006] The present invention provides an electromagnetic primary-secondary fusion device, which comprises a standard pole-mounted circuit breaker, a fused PT (Potential Transformer) and a fused FTU (Field Termination Unit); the fused FTU comprises an FTU basic function module, a carrier main control module and a carrier machine part, and the carrier machine part comprises a part of a sending module and a part of a receiving module; the fused PT comprises a carrier feed network sending module and a carrier receiving drive module; there is a fused PT at each end of the standard pole-mounted circuit breaker, and the two fused PTs are connected through a signal line; the fused FTU draws power through the fused PT.

[0007] Furthermore, in the fused FTU, the FTU basic function module and the carrier main control module share a chip; the carrier machine part, part of the sending module and part of the receiving module share a chip.

[0008] Furthermore, the carrier machine in the fusion FTU transmits the carrier signal to the fusion PT through the signal line; the fusion PT combines the traditional PT with the carrier coupling device.

[0009] Furthermore, a carrier transmission chip is also provided in the fusion PT, and the carrier transmission chip feeds the received carrier signal to the 10kV line.

[0010] The method for image model verification using the electromagnetic primary and secondary fusion device of the present invention comprises the following steps:

[0011] Step 1: The FTU receives a signal from the master station to start topology identification or the time to start topology identification has arrived.

[0012] Step 2: The carrier master control module of the fused FTU sequentially controls the switching modules in the carrier machine part of other fused FTUs to send out low-frequency signals as needed.

[0013] Step 3: The low-frequency signal is transmitted along the 10kV line in the direction opposite to the power supply current. Other fusion FTUs will detect the low-frequency signal and record it.

[0014] Step 4: The carrier master control module of the fusion FTU collects and counts the reception status of the low-frequency signal by other fusion FTUs through carrier communication.

[0015] Step 5: After sending and receiving low-frequency signals for many times, the carrier master control module draws the line topology information based on the statistical data and reports it to the master station.

[0016] The method for image model verification using the electromagnetic primary and secondary fusion device of the present invention comprises the following steps:

[0017] Step 1: After the FTU detects a fault, it communicates with the carrier machine through the network port and transmits the fault information to the carrier machine.

[0018] Step 2: After receiving the fault information, the carrier machine starts the distributed FA operation logic; the carrier machine autonomously asks its adjacent nodes whether a fault is detected, and forms a distributed FA operation result based on its own fault information.

[0019] Step 3: The carrier machine feeds back the distributed FA operation results to the fusion FTU.

[0020] Step 4: The fusion FTU decides whether the conditions for opening and closing operations are met. If the conditions for opening and closing operations are met, the circuit breaker is controlled by the aviation plug line to perform operations. If the conditions for opening and closing operations are not met, no processing is performed.

[0021] Step 5: All FA information of the fused FTU is transmitted to the carrier machine in real time.

[0022] Step 6: After FA is completed, the carrier master control module collects all FA-related fusion FTU information on the line and reports all FA information to the master station. The master station performs fault display and fault inversion based on the FA information.

[0023] The method for image model verification using the electromagnetic primary and secondary fusion device of the present invention comprises the following steps:

[0024] Step 1: The fusion FTU detects a fault and transmits the fault information to the carrier machine part, while performing power frequency recording.

[0025] Step 2: After receiving the fault information, the carrier machine starts the distributed FA logic and turns on the traveling wave recording function to record the fault waveform and calculate the wave head data.

[0026] Step 3: The wave head data, traveling wave waveform and power frequency recording file are reported to the main station through the 4G module of the fusion FTU.

[0027] Step 4: The master station analyzes the fault based on the reported data and waveform files to obtain the exact location of the fault.

[0028] Furthermore, for a short-circuit fault, the condition for the downstream node of the fault point to trigger the traveling wave recording and wave head data calculation is the distributed FA interaction information; for a grounding fault, the condition for the downstream node of the fault point to trigger the traveling wave recording and wave head data calculation is the detection of a suspected grounding fault.

[0029] The beneficial effects of the present invention are:

[0030] The medium-voltage carrier communication system is integrated into the fused FTU, and topology identification and distributed FA functions are realized through the medium-voltage carrier, which shortens the fault self-healing time and provides support for the construction of distribution automation. At the same time, it has the function of traveling wave ranging, which shortens the line patrol cost, improves the feeder fault diagnosis capability, and enhances the level of feeder automation fault handling. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a design principle block diagram of the electromagnetic primary and secondary fusion device of the present invention;

[0032] Figure 2 This is a schematic block diagram of the FTU, carrier master control, carrier machine chip and their interaction in the present invention;

[0033] Figure 3 It is a logic block diagram of the image model verification of the present invention;

[0034] Figure 4 It is a logic block diagram of the distributed FA of the present invention;

[0035] Figure 5 It is a logic block diagram of the precise positioning of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. These implementation examples are described in sufficient detail so that those skilled in the art can understand and practice the present invention. Without departing from the spirit and scope of the present invention, logical, achievable and other changes may be made to the implementation. Therefore, the following detailed description should not be construed as limiting, and the scope of the present invention is limited only by the claims.

[0037] See also Figure 1 The electromagnetic primary and secondary fusion device of the present invention includes a standard pole-mounted circuit breaker, a fused PT and a fused FTU.

[0038] The fusion FTU includes complete FTU basic functions, carrier master control module and carrier machine part. The carrier machine part includes some sending modules and some receiving modules.

[0039] The fused PT includes a carrier feeder transmission module and a carrier receiving driver module.

[0040] There is a fused PT at each end of the standard pole-mounted circuit breaker. The two fused PTs are connected by a signal line. Even if the standard pole-mounted circuit breaker is in the open state, the connectivity of the carrier transmission can be guaranteed.

[0041] In this embodiment, the fused FTU draws power through the fused PT.

[0042] See also Figure 2In the fusion FTU, the complete FTU basic functions share a chip (i.e., chip 1) and the same network port with the carrier main control module. The carrier machine part, part of the sending module and part of the receiving module use a separate chip (i.e., chip 2).

[0043] The carrier machine in the fusion FTU transmits the carrier signal to the fusion PT through the signal line. The fusion PT combines the traditional PT with the carrier coupling device. The fusion PT has a carrier transmission chip (i.e., chip 3) inside, which feeds the received carrier signal to the 10kV line.

[0044] See also Figure 3 , the electromagnetic primary and secondary fusion device of the present invention is used to perform image model verification, and the specific method is as follows:

[0045] Step 1: The FTU receives a signal from the master station to start topology identification or the time to start topology identification has arrived.

[0046] Step 2: The carrier master control module of the fused FTU can control the switching modules in the carrier machine part of other fused FTUs in turn to send out low-frequency signals as needed.

[0047] Step 3: The low frequency signal will be transmitted along the 10kV line in the opposite direction of the supply current. Other fusion FTUs will detect the low frequency signal and record it.

[0048] Step 4: The carrier master control module of the fusion FTU will collect and count the reception status of the low-frequency signal by other fusion FTUs through carrier communication.

[0049] Step 5: After sending and receiving low-frequency signals for many times, the carrier master control module draws the line topology information based on the statistical data and reports it to the master station to realize the topology identification function.

[0050] See also Figure 4 , using the electromagnetic primary and secondary fusion device of the present invention to perform distributed FA, the fusion FTU has the ability to detect short circuit and ground faults, the specific method is as follows:

[0051] Step 1: After the FTU detects a fault, it will communicate with the carrier machine through the network port and transmit the fault information to the carrier machine.

[0052] Step 2: After receiving the fault information, the carrier machine starts the distributed FA operation logic. The carrier machine will autonomously ask its neighboring nodes whether a fault is detected, and combine its own fault information to form a distributed FA operation result.

[0053] Step 3: The carrier machine feeds back the distributed FA operation results to the fusion FTU.

[0054] Step 4: The fusion FTU decides whether the conditions for opening and closing are met. If the conditions are met, the circuit breaker will be controlled by the aviation plug line to perform the action. If the conditions are not met, no action will be taken.

[0055] Step 5: All FA information of the fused FTU is transmitted to the carrier machine in real time.

[0056] Step 6: After FA is completed, the carrier master control module will collect all FA-related fusion FTU information on the line and report all FA information to the master station, which can display and reverse the fault according to the FA information. This will achieve rapid isolation of the fault and restoration of power supply to the non-fault area, thus realizing the distributed FA function.

[0057] See also Figure 5 , use the electromagnetic primary and secondary fusion device of the present invention to perform precise positioning, the specific method is as follows:

[0058] Step 1: The fusion FTU detects a fault, transmits the fault information to the carrier part, and performs power frequency recording at the same time. The fusion FTU reports the fault SOE to the main station through the 4G module.

[0059] Step 2: After the carrier machine receives the fault information, it starts the distributed FA logic and turns on the traveling wave recording function to record the fault waveform and calculate the wave head data.

[0060] Step 3: The wave head data, traveling wave waveform and power frequency recording file will be reported to the main station through the 4G module of the fusion FTU.

[0061] Step 4: The master station uses the reported data and waveform files to analyze the fault and obtain the exact location of the fault to achieve accurate fault location.

[0062] For short-circuit faults, the condition for the downstream nodes of the fault point to trigger the traveling wave recording and wave head data calculation is the distributed FA interaction information. For ground faults, the condition for the downstream nodes of the fault point to trigger the traveling wave recording and wave head data calculation is the detection of a suspected ground fault.

[0063] The present invention develops a new type of power distribution terminal device based on a primary fusion device. The device has a medium-voltage carrier communication function to provide communication support for the business. The device of the present invention is based on medium-voltage carrier communication and provides a topology identification function to provide a topological basis for protection services. The device of the present invention is based on medium-voltage carrier communication and has a traveling wave ranging function to reduce line patrol costs. The present invention has a distributed FA function based on medium-voltage carrier communication, which shortens the fault self-healing time and provides support for the construction of distribution automation.

[0064] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. An electromagnetic primary and secondary fusion device, characterized in that: It includes standard pole-mounted circuit breakers, fused PT and fused FTU; the fused FTU includes FTU basic function module, carrier main control module and carrier machine part, the carrier machine part includes some sending modules and some receiving modules; the fused PT includes carrier feed network sending module and carrier receiving drive module; There is a fused PT at each end of the standard pole-mounted circuit breaker, and the two fused PTs are connected by a signal line; the fused FTU draws power through the fused PT.

2. The electromagnetic primary and secondary fusion device according to claim 1, characterized in that: In the fused FTU, the FTU basic function module and the carrier main control module share a chip; the carrier machine part, part of the sending module and part of the receiving module share a chip.

3. The electromagnetic primary and secondary fusion device and method according to claim 2, characterized in that: The carrier machine in the fusion FTU transmits the carrier signal to the fusion PT through the signal line; the fusion PT combines the traditional PT with the carrier coupling device.

4. The electromagnetic primary and secondary fusion device and method according to claim 3, characterized in that: The fusion PT is also equipped with a carrier transmission chip, which feeds the received carrier signal to the 10kV line.

5. A method for image model verification using the device according to claims 1 to 4, characterized in that: The following steps are involved: Step 1: The FTU receives a signal from the master station to start topology identification or the time to start topology identification has arrived; Step 2: The carrier master control module of the fusion FTU controls the switching modules in the carrier machine part of other fusion FTUs in turn to send low-frequency signals as needed; Step 3: The low-frequency signal is transmitted along the 10kV line in the direction opposite to the power supply current. Other fusion FTUs will detect the low-frequency signal and record it. Step 4: The carrier master control module of the fusion FTU collects and counts the reception status of the low-frequency signal by other fusion FTUs through carrier communication; Step 5: After sending and receiving low-frequency signals for many times, the carrier master control module draws the line topology information based on the statistical data and reports it to the master station.

6. A method for performing distributed FA using the device according to claims 1 to 4, characterized in that: The following steps are involved: Step 1: After the FTU detects a fault, it communicates with the carrier through the network port and transmits the fault information to the carrier part; Step 2: After receiving the fault information, the carrier machine starts the distributed FA operation logic; the carrier machine autonomously asks its neighboring nodes whether a fault is detected, and forms a distributed FA operation result based on its own fault information; Step 3: The carrier machine feeds back the distributed FA operation results to the fusion FTU; Step 4: The fusion FTU decides whether the conditions for opening and closing operations are met; if the conditions for opening and closing operations are met, the circuit breaker is controlled by the aviation plug line to perform operations; if the conditions for opening and closing operations are not met, no processing is performed; Step 5: All FA information of the fused FTU is transmitted to the carrier in real time; Step 6: After FA is completed, the carrier master control module collects all FA-related fusion FTU information on the line and reports all FA information to the master station. The master station performs fault display and fault inversion based on the FA information.

7. A method for accurate positioning using the device according to claims 1 to 4, characterized in that: The following steps are involved: Step 1: The fusion FTU detects a fault and transmits the fault information to the carrier machine part, while performing power frequency recording; Step 2: After receiving the fault information, the carrier machine starts the distributed FA logic and starts the traveling wave recording function to record the fault waveform and calculate the wave head data; Step 3: The wave head data, traveling wave waveform and power frequency recording file are reported to the main station through the 4G module of the fusion FTU; Step 4: The master station analyzes the fault based on the reported data and waveform files to obtain the exact location of the fault.

8. The method according to claim 7, characterized in that For a short-circuit fault, the condition for the downstream node of the fault point to trigger the traveling wave recording and wave head data calculation is the distributed FA interaction information; for a grounding fault, the condition for the downstream node of the fault point to trigger the traveling wave recording and wave head data calculation is the detection of a suspected grounding fault.

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