Reactor turn-to-turn short circuit on-line monitoring system and method based on detection coil array

Abstract

The invention provides a reactor turn-to-turn short circuit online monitoring system and method based on a detection coil array, and the system comprises a signal collection unit which obtains the differential voltage signal data of a plurality of detection coil groups of a to-be-detected annular air-core reactor; the filter circuit is used for carrying out filtering processing on the data to obtain differential voltage signal data after filtering processing; the A / D conversion circuit is used for performing analog-to-digital conversion on the data to obtain a plurality of groups of discrete data; the controller is used for processing the plurality of groups of discrete data by adopting a second-order difference method to obtain change rates of the plurality of groups of discrete data; and the monitoring center upper computer analyzes whether a turn-to-turn short circuit fault occurs in the to-be-detected annular air-core reactor based on the change rate of the plurality of groups of discrete data. The turn-to-turn short-circuit fault part can be timely removed at the early stage of the turn-to-turn short-circuit fault, the monitoring device and the monitoring process are simple, the monitoring cost is reduced, and the sensitivity and the accuracy of turn-to-turn short-circuit fault monitoring are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to an online monitoring system and method for reactor turn-to-turn short circuits based on a detection coil array. Background Art

[0002] With the development of science and technology and the progress of society, my country's power grid construction has accelerated and expanded, and the number of substations has also increased. Ring-type air-core reactors have replaced cylindrical air-core reactors, confining most of the magnetic field within the coil, thus resolving the problems caused by the open magnetic field. When a turn-to-turn short-circuit fault occurs in a ring-type reactor, there is a hidden danger that affects the safe operation of the system. However, current research on ring-type air-core reactors only focuses on the design of basic structures and is unable to effectively study the monitoring of turn-to-turn short-circuit faults in ring-type air-core reactors. If the faulty reactor cannot be detected and cleared in time, the reactor will catch fire within a short period of time, affecting the normal operation of the power system and causing huge losses.

[0003] In the related technology, the Chinese invention patent with patent application number "CN202210808142.5" discloses a "Dry-type air-core reactor inter-turn short-circuit magnetic field detection device based on magnetoresistance effect", which includes a magnetic field measurement probe arranged near the dry-type air-core reactor and a voltage-stabilized power supply and a data acquisition and processing module respectively connected to the magnetic field measurement probe. The magnetic field measurement probe adopts a Wheatstone bridge structure, and realizes the working condition judgment of the reactor by directly collecting the inter-turn short-circuit fault magnetic field data of the dry-type air-core reactor. However, this related technology is applied to large-scale toroidal air-core reactors. Since the magnetic field distribution of the toroidal reactor is concentrated inside the ring, there are problems such as difficulty in installing the magnetic field probe, and the cost is high; the Chinese invention patent with the patent application number "CN202010947591.9" discloses a "method and device for inter-turn short-circuit protection of dry-type air-core reactors based on power factor". This patent arranges multiple magnetic induction intensity measurement components in the air-core reactor to be monitored. According to the ratio of the measured magnetic induction intensity and the outgoing busbar current, it can be judged whether inter-turn breakdown occurs at the position of the air-core reactor to be monitored corresponding to the magnetic induction intensity measurement component. However, the electrical parameter monitoring method used in this technology has the problem of low monitoring sensitivity in the early stage of the fault, and the number of coil windings of the toroidal air-core reactor is increased exponentially compared to the column-type reactor. The electrical parameters at the time of the fault have little impact on the overall situation, and the monitoring sensitivity is low.

[0004] In view of this, there is an urgent need to provide a new online monitoring system for inter-turn short-circuit faults of ring-type air-core reactors to solve the problems in related technologies such as difficulty in installing monitoring devices, complex layout and high monitoring costs, inability to monitor inter-turn short-circuit faults of ring-type air-core reactors in the early stages of faults, inability to promptly cut off the branch where the fault is located, low accuracy and low sensitivity in inter-turn short-circuit fault monitoring. Summary of the Invention

[0005] In response to the technical problems existing in the related technologies, the present invention provides an online monitoring system and method for inter-turn short circuit of reactors based on a detection coil array, which performs online monitoring and fault diagnosis on ring-type hollow reactors, not only ensuring the safe and reliable operation of the ring-type hollow reactors, but also the operation and maintenance personnel can not only judge whether the ring-type hollow reactors have inter-turn short circuit faults by real-time monitoring of the vibration speed changes of each coil of the ring-type hollow reactors, and timely monitor the early faults of the ring-type hollow reactors, but also timely remove the inter-turn short circuit fault part in the early stage of the inter-turn short circuit fault. The monitoring device and the monitoring process are relatively simple, reducing the monitoring cost, improving the sensitivity and accuracy of inter-turn short circuit fault monitoring, and helping to build a safe and reliable power network.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention discloses an online monitoring system for inter-turn short circuit of a reactor based on a detection coil array, the system comprising:

[0008] The signal acquisition unit obtains differential voltage signal data of the plurality of detection coil groups by respectively measuring the voltage differences between the input and output ports of the plurality of detection coil groups of the toroidal air-core reactor to be tested;

[0009] a filtering circuit, configured to filter the differential voltage signal data of the plurality of detection coil groups acquired by the signal acquisition unit to obtain filtered differential voltage signal data;

[0010] An A / D conversion circuit is used to perform analog-to-digital conversion on the filtered differential voltage signal data to obtain a plurality of groups of discrete data, and to send the plurality of groups of discrete data respectively;

[0011] a controller, configured to receive the plurality of discrete data groups sent by the A / D conversion circuit, process the plurality of discrete data groups using a second-order difference method to obtain change rates of the plurality of discrete data groups, and transmit the change rates of the plurality of discrete data groups via wireless communication;

[0012] The monitoring center host computer is used to receive the change rates of the multiple sets of discrete data sent by the controller, and analyze whether the ring-type air-core reactor to be tested has an inter-turn short circuit fault based on the change rates of the multiple sets of discrete data.

[0013] In some embodiments, the system further comprises:

[0014] The relay protection unit is used to receive the relay protection signal sent by the upper computer of the monitoring center based on the determination that the toroidal air-core reactor to be tested has an inter-turn short-circuit fault, perform relay protection action according to the received relay protection signal, and cut off the branch of the toroidal air-core reactor to be tested where the inter-turn short-circuit fault occurs from the circuit.

[0015] In some embodiments, the system further comprises:

[0016] The data storage and display unit is used to receive the alarm signal sent by the upper computer of the monitoring center based on the determination that the toroidal air-core reactor to be tested has an inter-turn short-circuit fault, and extract the electrical parameters and magnetic field distribution information of the toroidal air-core reactor to be tested according to the received alarm signal and display them.

[0017] In some embodiments, the signal acquisition unit includes:

[0018] The coil setting module is used to evenly place a number of detection coils along the annular direction inside the toroidal air-core reactor to be tested, and set a number of coils between two adjacent detection coils. Each detection coil and the adjacent number of coils constitute a coil group; each detection coil is connected to the input port and output port of its opposite coil in a reverse wiring manner to form a detection coil group.

[0019] In some embodiments, each of the detection coils is cast and encapsulated together with the adjacent wire coils, and an inlet port and an outlet port are left out during the casting and encapsulation process to form a wire coil group.

[0020] In some embodiments, the detection coil is disposed at the central axis of the coil, and a shape of the detection coil is similar to or identical to a shape of the coil.

[0021] In some embodiments, the monitoring center host computer includes:

[0022] a determination module, configured to determine whether a rate of change of the plurality of groups of discrete data is greater than or equal to a threshold value of a rate of change of the discrete data of the toroidal air-core reactor to be tested in a normal operating state, which is preset in a host computer of the monitoring center; if the rate of change of the plurality of groups of discrete data is greater than or equal to the threshold value of the rate of change, determining that a turn-to-turn short circuit fault occurs in the toroidal air-core reactor to be tested, and sending an alarm signal;

[0023] The fault location module is used to locate the discrete data with the largest change rate, and take the coil group where the detection coil group corresponding to the discrete data with the largest change rate is located as the location where the inter-turn short circuit fault occurs.

[0024] In a second aspect, the present invention discloses an online monitoring method for a reactor turn-to-turn short circuit based on a detection coil array, which is applied to the above-mentioned online monitoring system for a reactor turn-to-turn short circuit based on a detection coil array. The method comprises:

[0025] Respectively measuring the voltage differences between the input and output ports of several detection coil groups of the toroidal air-core reactor to be tested, and obtaining differential voltage signal data of the several detection coil groups;

[0026] performing filtering processing on the acquired differential voltage signal data of the plurality of detection coil groups to obtain filtered differential voltage signal data;

[0027] Performing analog-to-digital conversion on the filtered differential voltage signal data to obtain several groups of discrete data;

[0028] Processing the plurality of discrete data sets by a second-order difference method to obtain change rates of the plurality of discrete data sets;

[0029] The change rates of the plurality of groups of discrete data are received through wireless communication, and based on the change rates of the plurality of groups of discrete data, it is analyzed whether an inter-turn short circuit fault occurs in the ring-type air-core reactor to be tested.

[0030] In a third aspect, the present invention discloses a computer device, comprising:

[0031] at least one processor; and,

[0032] a memory communicatively connected to the at least one processor; wherein,

[0033] The memory stores instructions that can be executed by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to execute the above-mentioned online monitoring method for inter-turn short circuit of a reactor based on a detection coil array.

[0034] In a fourth aspect, the present invention discloses a computer-readable storage medium storing computer instructions for causing a computer to execute the above-mentioned method for online monitoring of inter-turn short circuits in reactors based on a detection coil array.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention provides an online monitoring system and method for inter-turn short circuit of a reactor based on a detection coil array. The system performs online monitoring and fault diagnosis on a ring-type air-core reactor. The system calculates the voltage difference between the input port and the output port of a plurality of detection coil groups of the ring-type air-core reactor to be tested, performs filtering processing on the differential voltage signal data of the plurality of detection coil groups, performs analog-to-digital conversion on the filtered differential voltage signal data to obtain a plurality of groups of discrete data, adopts a second-order difference method to obtain the rate of change of the discrete data based on the plurality of discrete data, and uses this to analyze whether an inter-turn short circuit fault occurs in the ring-type air-core reactor to be tested. The present invention can ensure the safe and reliable operation of the annular air-core reactor. The operation and maintenance personnel can not only judge whether the annular air-core reactor has an inter-turn short-circuit fault by real-time monitoring of the vibration speed changes of each coil of the annular air-core reactor, and timely monitor the early fault of the annular air-core reactor, but also timely cut off the inter-turn short-circuit fault part in the early stage of the inter-turn short-circuit fault. The monitoring device and the monitoring process are relatively simple, which reduces the monitoring cost, improves the sensitivity and accuracy of the inter-turn short-circuit fault monitoring, and helps to build a safe and reliable power network. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic structural diagram of an online monitoring system for inter-turn short circuit of a reactor based on a detection coil array provided in an embodiment of the present disclosure;

[0038] Figure 2 A schematic diagram of the structure and spatial position of the detection coil provided in an embodiment of the present disclosure;

[0039] Figure 3 A schematic diagram of the structure and spatial position of a detection coil assembly provided in an embodiment of the present disclosure;

[0040] Figure 4 A schematic flow chart of an online monitoring method for inter-turn short circuit of a reactor based on a detection coil array provided in an embodiment of the present disclosure;

[0041] Figure 5 A schematic diagram of the structure of a computer device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] It is worth noting that the methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products, and their sources are not specifically limited unless otherwise specified.

[0043] like Figure 1 As shown, Figure 1 A schematic structural diagram of an online monitoring system for inter-turn short circuit of a reactor based on a detection coil array is provided in an embodiment of the present disclosure. The system includes:

[0044] The signal acquisition unit A1 obtains differential voltage signal data of several groups of detection coil groups 7 by respectively measuring the voltage difference between the input port 5 and the output port 6 of several groups of detection coil groups 7 of the toroidal air-core reactor to be tested;

[0045] The filter circuit A2 is used to filter the differential voltage signal data of the plurality of detection coil groups 7 acquired by the signal acquisition unit A1 to obtain filtered differential voltage signal data;

[0046] A / D conversion circuit A3, used for performing analog-to-digital conversion on the filtered differential voltage signal data to obtain a plurality of groups of discrete data, and sending the plurality of groups of discrete data respectively;

[0047] a controller A4 configured to receive the plurality of discrete data sets sent by the A / D conversion circuit A3, process the plurality of discrete data sets using a second-order difference method to obtain change rates of the plurality of discrete data sets, and transmit the change rates of the plurality of discrete data sets via wireless communication;

[0048] The monitoring center host computer A5 is used to receive the change rates of the multiple sets of discrete data sent by the controller A4, and analyze whether the ring-type air-core reactor to be tested has an inter-turn short circuit fault based on the change rates of the multiple sets of discrete data.

[0049] In some embodiments, the system further comprises:

[0050] The relay protection unit A6 is used to receive the relay protection signal sent by the monitoring center host computer A5 based on the determination that the toroidal hollow reactor to be tested has an inter-turn short-circuit fault, perform relay protection action according to the received relay protection signal, and cut off the branch of the toroidal hollow reactor to be tested where the inter-turn short-circuit fault occurs from the circuit.

[0051] The present invention provides an online monitoring system for inter-turn short circuit of a reactor based on a detection coil array, which performs online monitoring and fault diagnosis on a ring-type air-core reactor. The system calculates the differential voltage signal data of the plurality of detection coil groups through the voltage difference between the incoming port and the outgoing port of the plurality of detection coil groups of the ring-type air-core reactor to be tested, performs filtering processing, performs analog-to-digital conversion on the filtered differential voltage signal data to obtain a plurality of groups of discrete data, adopts a second-order difference method to obtain the rate of change of the discrete data based on the plurality of discrete data, and uses this to analyze whether an inter-turn short circuit fault occurs in the ring-type air-core reactor to be tested. The present invention can ensure the safe and reliable operation of the annular air-core reactor. The operation and maintenance personnel can not only judge whether the annular air-core reactor has an inter-turn short-circuit fault by real-time monitoring of the vibration speed changes of each coil of the annular air-core reactor, and timely monitor the early fault of the annular air-core reactor, but also timely cut off the inter-turn short-circuit fault part in the early stage of the inter-turn short-circuit fault. The monitoring device and the monitoring process are relatively simple, which reduces the monitoring cost, improves the sensitivity and accuracy of the inter-turn short-circuit fault monitoring, and helps to build a safe and reliable power network.

[0052] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure and spatial position of the detection coil provided in an embodiment of the present disclosure. In this embodiment of the present disclosure, 56 runway-shaped coils 1 are provided as an example. The connection method of the toroidal air-core reactor to be tested adopts two parallel branches, each parallel branch consisting of 28 coils 1 connected in series. The 56 coils 1 are evenly divided into 8 coil groups 8. The 7 coils 1 in each coil group 8 are monitored by a detection coil 2 for magnetic field changes. The input and output wires of the detection coil 2 and its opposite coil are reversed to calculate the differential voltage value. Figure 2 In the embodiment, the wire drum 1 is provided with a wire drum inlet port 3 and a wire drum outlet port 4.

[0053] like Figure 3 As shown, Figure 3 A schematic diagram of the structure and spatial position of the detection coil group provided in an embodiment of the present disclosure, Figure 3In the example, the 56 coils 1 are divided into four groups of detection coils 7: Aa, Bb, Cc, and Dd. These four groups correspond to four discrete sets of differential voltage signal data in the monitoring system. When the toroidal air-core reactor under test is operating normally, the differential voltage of the detection coil 2 experiences only slight fluctuations. However, when a turn-to-turn short-circuit fault occurs within a coil group 8, the induced differential voltage gradually decreases as the severity of the fault increases. This phenomenon occurs because the high short-circuit current induced in the short-circuit loop during an interturn short-circuit fault is opposite to the normal current, weakening the overall magnetic field. This results in a large differential voltage between the detection coil 2 and the opposing coil in this detection coil group 7, and the differential voltages of the surrounding coils also increase to a certain extent. Furthermore, because the detection coil 2 is installed inside the coil 1, the rate of change of the induced voltage is most pronounced when a fault occurs within the coil 1, gradually increasing from the outside inward.

[0054] In some embodiments, in order to improve the sensitivity of the monitoring system in early detection of inter-turn short-circuit faults, the disclosed embodiment evenly places 8 detection coils 2 along the annular direction inside the toroidal air-core reactor to be tested, and each detection coil 2 is separated by 7 wire coils 1, that is, each detection coil 2 is used to monitor the operating conditions within the range of 7 wire coils 1. These 7 wire coils 1 and 1 detection coil 2 are called a wire coil group 8. Each detection coil 2 and its opposite coil are connected in reverse to calculate four sets of differential voltage signal data. By analyzing the differential voltage signal data of the detection coil 2, the working status of the toroidal air-core reactor to be tested can be judged and analyzed. In this way, the magnetic field changes in the space before and after the inter-turn short-circuit fault of the toroidal air-core reactor to be tested can be used to further convert the inter-turn short-circuit fault detection into the analysis and processing of the detection coil 2 signal.

[0055] In some embodiments, the system further comprises:

[0056] The data storage and display unit A7 is used to receive the alarm signal sent by the monitoring center host computer A5 based on the determination that the toroidal air-core reactor to be tested has an inter-turn short circuit fault, and extract the electrical parameters and magnetic field distribution information of the toroidal air-core reactor to be tested based on the received alarm signal and display them.

[0057] In some embodiments, the signal acquisition unit A1 includes:

[0058] The coil setting module A11 is used to evenly place a number of detection coils 2 along the annular direction inside the annular air-core reactor to be tested, and set a number of coils between two adjacent detection coils 2. Each detection coil and the adjacent number of coils constitute a coil group; each detection coil 2 is connected to the input port 5 and the output port 6 of its opposite coil in a reverse wiring manner to form a detection coil group 7.

[0059] In some embodiments, each detection coil 2 is cast and encapsulated together with the adjacent wire coils 1 , and an inlet port 5 and an outlet port 6 are left out during the casting and encapsulation process to form a wire coil group 8 .

[0060] In the design of the detection coil 2 in the embodiment of the present disclosure, in order to increase the induced voltage intensity of the detection coil 2 and to facilitate installation in engineering practice and voltage signal acquisition, the detection coil 2 is fixedly wound inside the coil 1 of the to-be-tested annular hollow reactor, the strong detection coil 2 is cast and sealed together with the coil 1, and the input port 5 and the output port 6 are left.

[0061] In some embodiments, the detection coil 2 is disposed at the central axis of the bobbin 1 , and the shape of the detection coil 2 is similar to or identical to that of the bobbin 1 .

[0062] In order to improve the planar magnetic induction intensity component of the detection coil 2, the embodiment of the present disclosure combines the distribution law of the magnetic field and magnetic lines of force when the toroidal air-core reactor to be tested is working. The detection coil 2 can be placed at the central axis position of the coil 1, and the shape of the detection coil 2 can be set to be similar to or the same as the shape of the coil 1. At the same time, the number of turns of the detection coil 2 is increased, which is more conducive to detecting abnormal changes in the output voltage signal.

[0063] In some embodiments, the monitoring center host computer A5 includes:

[0064] a determination module A51, configured to determine whether a rate of change of the plurality of sets of discrete data is greater than or equal to a threshold value of a rate of change of the discrete data of the toroidal air-core reactor to be tested in normal operation, which is preset in the host computer of the monitoring center; if the rate of change of the plurality of sets of discrete data is greater than or equal to the threshold value, determining that a turn-to-turn short circuit fault has occurred in the toroidal air-core reactor to be tested, and sending an alarm signal;

[0065] The fault location module A52 is used to locate the discrete data with the largest change rate, and take the coil group 8 where the detection coil group 7 corresponding to the discrete data with the largest change rate is located as the location where the inter-turn short circuit fault occurs.

[0066] It should be noted that the user can set the discrete data change rate threshold according to actual business needs, and the embodiments of the present disclosure do not limit this.

[0067] The disclosed embodiment takes into account the structure of the coil of the toroidal air-core reactor to be tested, designs the structure of the detection coil and sets the detection coil at the center axis position of the coil, thereby increasing the mutual inductance between the detection coil and the faulty turn, and thereby increasing the rate of change of the differential voltage signal when an inter-turn short-circuit fault occurs in the toroidal air-core reactor to be tested. The fault can be discovered in time at an early stage of the inter-turn short-circuit fault and the branch where the inter-turn short-circuit fault is located can be cut off, thereby improving sensitivity.

[0068] The disclosed embodiment sets the detection coil to an open-circuit state, resulting in an internal current value of zero. This allows it to be cast and sealed together with the coil of the annular hollow reactor to be tested without generating electromagnetic interference. Compared to the detection coil method for traditional cylindrical reactors, the monitoring system provided in this disclosure utilizes differential voltage signal monitoring, eliminates blind spots, and offers simple installation and system structure, making it less prone to malfunction and lowering costs.

[0069] like Figure 4 As shown, Figure 4 This is a flow chart of a method for online monitoring of a short circuit between turns of a reactor based on a detection coil array according to an embodiment of the present disclosure. The method comprises the following steps:

[0070] S101 , respectively measuring voltage differences between input ports and output ports of several detection coil groups of an annular air-core reactor to be tested, and obtaining differential voltage signal data of the several detection coil groups.

[0071] S102: Filter the acquired differential voltage signal data of the plurality of detection coil groups to obtain filtered differential voltage signal data.

[0072] S103 , performing analog-to-digital conversion on the filtered differential voltage signal data to obtain several groups of discrete data.

[0073] S104 , using a second-order difference method to process the plurality of discrete data sets to obtain change rates of the plurality of discrete data sets.

[0074] S105 , receiving the change rates of the plurality of groups of discrete data through wireless communication, and analyzing whether an inter-turn short circuit fault occurs in the toroidal air-core reactor to be tested based on the change rates of the plurality of groups of discrete data.

[0075] The present disclosure also provides a computer device, comprising:

[0076] at least one processor; and,

[0077] a memory communicatively connected to the at least one processor; wherein,

[0078] The memory stores instructions that can be executed by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to execute the above-mentioned online monitoring method for inter-turn short circuit of a reactor based on a detection coil array.

[0079] The computer device according to an embodiment of the present disclosure includes a memory and a processor. The memory is used to store non-transitory computer-readable instructions. Specifically, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache). The non-volatile memory may include, for example, read-only memory (ROM), a hard disk, a flash memory, etc.

[0080] The processor may be a central processing unit (CPU) or other form of processing unit having data processing capabilities and / or instruction execution capabilities, and may control other components in the computer device to perform desired functions. In one embodiment of the present disclosure, the processor is configured to execute the computer-readable instructions stored in the memory, causing the computer device to execute all or part of the steps of the aforementioned method for online monitoring of inter-turn short circuits in reactors based on a detection coil array in each embodiment of the present disclosure.

[0081] Those skilled in the art should understand that in order to solve the technical problem of how to obtain a good user experience, this embodiment may also include well-known structures such as a communication bus and an interface, and these well-known structures should also be included in the scope of protection of this disclosure.

[0082] like Figure 5 As shown, the computer device may include a processor (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded from a storage device into a random access memory (RAM). Various programs and data required for the operation of the computer device are also stored in the RAM. The processor, ROM, and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0083] Typically, the following devices can be connected to the I / O interface: input devices such as sensors or visual information acquisition devices; output devices such as display screens; storage devices such as tapes and hard disks; and communication devices. The communication device can allow the computer device to communicate with other devices (such as edge computing devices) wirelessly or by wire to exchange data. Figure 5A computer device having various devices is shown, but it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed instead.

[0084] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through a communication device, or installed from a storage device, or installed from a ROM. When the computer program is executed by a processor, all or part of the steps of the online monitoring method for inter-turn short circuit of a reactor based on a detection coil array of an embodiment of the present disclosure are performed.

[0085] For detailed description of this embodiment, please refer to the corresponding description in the aforementioned embodiments, which will not be repeated here.

[0086] According to an embodiment of the present disclosure, a computer-readable storage medium stores non-transitory computer-readable instructions. When the non-transitory computer-readable instructions are executed by a processor, all or part of the steps of the aforementioned methods for online monitoring of inter-turn short circuits in reactors based on a detection coil array are performed.

[0087] The above-mentioned computer-readable storage media include, but are not limited to, optical storage media (e.g., CD-ROMs and DVDs), magneto-optical storage media (e.g., MOs), magnetic storage media (e.g., magnetic tapes or mobile hard disks), media with built-in rewritable non-volatile memory (e.g., memory cards), and media with built-in ROM (e.g., ROM cartridges).

[0088] For detailed description of this embodiment, please refer to the corresponding description in the aforementioned embodiments, which will not be repeated here.

[0089] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this disclosure are merely illustrative and not restrictive, and should not be construed as necessarily possessed by each embodiment of the present disclosure. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, rather than as limitations. These details do not limit the present disclosure to necessarily being implemented using these specific details.

[0090] In the present disclosure, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. The block diagrams of the devices, devices, equipment, and systems involved in the present disclosure are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "including," "comprising," "having," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0091] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. The reactor inter-turn short circuit online monitoring system based on the detection coil array is characterized by: The system comprises: The signal acquisition unit obtains differential voltage signal data of the plurality of detection coil groups by respectively measuring the voltage differences between the input and output ports of the plurality of detection coil groups of the toroidal air-core reactor to be tested; a filtering circuit, configured to filter the differential voltage signal data of the plurality of detection coil groups acquired by the signal acquisition unit to obtain filtered differential voltage signal data; An A / D conversion circuit is used to perform analog-to-digital conversion on the filtered differential voltage signal data to obtain a plurality of groups of discrete data, and to send the plurality of groups of discrete data respectively; a controller, configured to receive the plurality of discrete data groups sent by the A / D conversion circuit, process the plurality of discrete data groups using a second-order difference method to obtain change rates of the plurality of discrete data groups, and transmit the change rates of the plurality of discrete data groups via wireless communication; The monitoring center host computer is used to receive the change rates of the multiple sets of discrete data sent by the controller, and analyze whether the ring-type air-core reactor to be tested has an inter-turn short circuit fault based on the change rates of the multiple sets of discrete data.

2. The on-line monitoring system for reactor turn-to-turn short circuit based on detection coil array according to claim 1, characterized in that: The system further comprises: The relay protection unit is used to receive the relay protection signal sent by the upper computer of the monitoring center based on the determination that the toroidal air-core reactor to be tested has an inter-turn short-circuit fault, perform relay protection action according to the received relay protection signal, and cut off the branch of the toroidal air-core reactor to be tested where the inter-turn short-circuit fault occurs from the circuit.

3. The on-line monitoring system for reactor turn-to-turn short circuit based on detection coil array according to claim 1, characterized in that: The system further comprises: The data storage and display unit is used to receive the alarm signal sent by the upper computer of the monitoring center based on the determination that the toroidal air-core reactor to be tested has an inter-turn short-circuit fault, and extract the electrical parameters and magnetic field distribution information of the toroidal air-core reactor to be tested according to the received alarm signal and display them.

4. The reactor inter-turn short circuit online monitoring system based on the detection coil array according to claim 1 is characterized in that: The signal acquisition unit includes: The coil setting module is used to evenly place a number of detection coils along the annular direction inside the toroidal air-core reactor to be tested, and set a number of coils between two adjacent detection coils. Each detection coil and the adjacent number of coils constitute a coil group; each detection coil is connected to the input port and output port of its opposite coil in a reverse wiring manner to form a detection coil group.

5. The on-line monitoring system for reactor turn-to-turn short circuit based on detection coil array according to claim 4, characterized in that: Each detection coil is cast and encapsulated together with the adjacent plurality of wire coils, and an inlet port and an outlet port are left out during the casting and encapsulation process to form a wire coil group.

6. The reactor inter-turn short circuit online monitoring system based on the detection coil array according to claim 4 or claim 5, characterized in that: The detection coil is arranged at the central axis position of the coil, and the shape of the detection coil is similar to or the same as that of the coil.

7. The on-line monitoring system for reactor turn-to-turn short circuit based on detection coil array according to claim 1, characterized in that: The monitoring center host computer includes: a determination module, configured to determine whether a rate of change of the plurality of groups of discrete data is greater than or equal to a threshold value of a rate of change of the discrete data of the toroidal air-core reactor to be tested in a normal operating state, which is preset in a host computer of the monitoring center; if the rate of change of the plurality of groups of discrete data is greater than or equal to the threshold value of the rate of change, determining that a turn-to-turn short circuit fault occurs in the toroidal air-core reactor to be tested, and sending an alarm signal; The fault location module is used to locate the discrete data with the largest change rate, and take the coil group where the detection coil group corresponding to the discrete data with the largest change rate is located as the location where the inter-turn short circuit fault occurs.

8. A method for online monitoring of inter-turn short circuit of a reactor based on a detection coil array, applied to an online monitoring system for inter-turn short circuit of a reactor based on a detection coil array according to any one of claims 1 to 7, characterized in that: The method comprises: Respectively measuring the voltage differences between the input and output ports of several detection coil groups of the toroidal air-core reactor to be tested, and obtaining differential voltage signal data of the several detection coil groups; performing filtering processing on the acquired differential voltage signal data of the plurality of detection coil groups to obtain filtered differential voltage signal data; Performing analog-to-digital conversion on the filtered differential voltage signal data to obtain several groups of discrete data; Processing the plurality of discrete data sets by a second-order difference method to obtain change rates of the plurality of discrete data sets; The change rates of the plurality of groups of discrete data are received through wireless communication, and based on the change rates of the plurality of groups of discrete data, it is analyzed whether an inter-turn short circuit fault occurs in the ring-type air-core reactor to be tested.

9. A computer device, characterized in that: The computer device comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the online monitoring method for inter-turn short circuit of a reactor based on a detection coil array as described in claim 8.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the online monitoring method for inter-turn short circuit of a reactor based on a detection coil array as claimed in claim 8.

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