A method, apparatus, equipment, and storage medium for detecting neutral line (N-line) anomalies.

Abstract

This invention discloses a method, apparatus, device, and storage medium for detecting neutral line (N) line anomalies. The method includes: determining the number of faulty phases on the local side based on local characteristic quantities; when the number of faulty phases on the local side is greater than or equal to a preset number of phases, determining the number of faulty phases on the opposite side based on opposite characteristic quantities; when the number of faulty phases on the local side is greater than the number of faulty phases on the opposite side, determining whether the voltage of the excess faulty phases on the local side meets the normal phase voltage range; if the voltage of the excess faulty phases on the local side meets the normal phase voltage range, then determining that the neutral line (N) line is abnormal. This solution achieves intelligent detection of N-line connection anomalies in the zero-sequence loop.

Description

Technical Field

[0001] The embodiments of the present invention relate to three-phase line technology of power grids, and more particularly to a method, device, equipment and storage medium for detecting anomalies in the neutral line (N line). Background Technology

[0002] The power system protection circuit includes the secondary coil of a current transformer and a protection device. The secondary coil of the current transformer senses the magnitude and direction of the current in the primary equipment. The protection device collects the magnitude and direction of the current in the secondary current circuit based on the three-phase (A, B, C) coils, and performs circuit system fault protection based on the magnitude and direction of the current in the primary equipment. In the secondary current circuit, the three phases (A, B, C) merge into a single neutral line (N line) after exiting the protection device and return to the center point of the secondary coil of the current transformer to form a loop. When the three phases are balanced, the currents of the three phases (A, B, C) in the secondary current circuit are equal in magnitude, 120° out of phase, and the vector sum of the three phases is zero, meaning there is no current in the neutral line (N line). When the three phases are unbalanced, the vector sum is not zero, generating a zero-sequence current. This zero-sequence current flows through the N line to form a zero-sequence loop.

[0003] Specifically, in circuit system fault protection, taking the A-phase current differential protection of line protection as an example, Figure 1 This is the protection principle diagram of phase A of the line protection in the existing technology, such as... Figure 1 As shown, when the fault occurs at point K1 between the primary equipment and the protection device, the current I on both sides is within the protection range. M I N Both currents are in the positive direction (according to regulations, the positive direction is the current flowing out of the busbar). At this time, the currents on both sides of the phase are in phase, their amplitudes are superimposed, and the vector sum is very large, exceeding the set value. The protection determines it as a fault within the protection zone, and the protection action is to disconnect the switches on both sides to achieve fault isolation. When the fault point occurs outside the protection zone at K2 (i.e., at one end of the primary equipment or one end of the protection device output side), the current I on one side is... M If positive, the current I on one side is... N If the values ​​are negative, their amplitudes cancel each other out, resulting in a very small vector sum. The protection system judges this as an external fault and does not activate. If there is a single-phase fault within the three-phase zone, a single-phase fault outside the three-phase zone, a two-phase fault within the three-phase zone, or a two-phase fault outside the three-phase zone (i.e., an asymmetrical grounding fault occurs in the three-phase line), and if an abnormal N-line connection occurs simultaneously in the zero-sequence circuit, the protection device may malfunction or fail to operate.

[0004] Currently, numerous incidents have occurred where protection devices malfunctioned due to the neutral (N) wire in the secondary current circuit being disconnected (or having poor contact). These incidents, where protection devices fail to operate or even malfunction after equipment is put into operation, pose a significant threat to power grid safety. A broken neutral (N) wire has become a major hidden danger. Existing technologies cannot intelligently identify abnormal connections in the secondary current circuit's N wire. Summary of the Invention

[0005] This invention provides a method, apparatus, device, and storage medium for detecting neutral line / N line anomalies, so as to realize intelligent detection of neutral line / N line connection anomalies in zero-sequence circuits.

[0006] In a first aspect, embodiments of the present invention provide a method for detecting neutral line (N-line) anomalies, the method comprising:

[0007] The number of faulty phases on this side is determined based on the characteristic quantities of this side.

[0008] When the number of faulty phases on this side is greater than or equal to the preset number of phases, the number of faulty phases on the opposite side is determined based on the characteristic quantities on the opposite side.

[0009] When the number of faulty phases on this side is greater than the number of faulty phases on the opposite side, determine whether the voltage of the excess faulty phases on this side meets the normal phase voltage range;

[0010] If the voltage of the excess faulty phase on this side meets the normal phase voltage range, then it is determined that the neutral line N line is abnormal.

[0011] Optionally, after determining that the neutral line (N-line) has an anomaly, the following steps may also be taken:

[0012] The system fault type is determined to be a three-phase asymmetrical fault, and an alarm signal is sent.

[0013] Optionally, after determining whether the voltage of the redundant faulty phase on this side meets the normal phase voltage range, the following steps are also included:

[0014] Detect the zero-sequence current on the neutral line N on this side;

[0015] If the voltage of the excess faulty phase on this side meets the normal phase voltage range, then it is determined that the neutral line N line is abnormal, including:

[0016] If the voltage of the excess faulty phase on this side meets the normal phase voltage range, and the zero-sequence current is equal to 0, then the abnormality of the neutral line N line is determined to be a broken line abnormality.

[0017] Optionally, after determining that the anomaly in the neutral line (N line) is a breakage anomaly, the following steps are also included:

[0018] The system fault type is determined to be a three-phase asymmetrical fault, and an alarm signal and a lockout protection action signal are sent.

[0019] Optionally, the number of faulty phases on this side can be determined based on the characteristic quantities of this side, including:

[0020] The number of faulty phases on this side is determined based on the magnitude of the current on this side or the harmonic characteristics of the current on this side.

[0021] The number of faulty phases on the opposite side is determined based on the characteristic quantities on the opposite side, including:

[0022] The number of faulty phases on the opposite side is determined based on the magnitude of the current on the opposite side or the harmonic characteristics of the current on the opposite side.

[0023] Secondly, embodiments of the present invention also provide a neutral line (N-line) anomaly detection device, the device comprising:

[0024] The first phase number determination module is used to determine the number of faulty phases on this side based on the characteristic quantities of this side.

[0025] The second phase number determination module is used to determine the number of faulty phases on the opposite side based on the characteristic quantities of the opposite side when the number of faulty phases on the local side is greater than or equal to the preset number of phases.

[0026] The voltage determination module is used to determine whether the voltage of the excess faulty phases on the local side meets the normal phase voltage range when the number of faulty phases on the local side is greater than the number of faulty phases on the opposite side.

[0027] The N-line anomaly determination module is used to determine that the neutral line (N-line) is abnormal when the voltage of the excess faulty phase on this side meets the voltage range of the normal phase.

[0028] Optional, also includes:

[0029] The detection module is used to detect the zero-sequence current on the neutral line N on this side;

[0030] The N-line anomaly determination module includes: a disconnection anomaly determination unit;

[0031] The open circuit anomaly determination unit is used to determine that the neutral line (N line) has an open circuit anomaly when the voltage of the excess fault phase on this side meets the normal phase voltage range and the zero-sequence current is equal to 0.

[0032] Optionally, the first phase number determination module includes: a first phase number determination unit;

[0033] The first phase number determination unit is used to determine the number of faulty phases on the local side based on the magnitude of the local current or the harmonic characteristics of the local current.

[0034] The second phase number determination module includes a second phase number determination unit.

[0035] The second phase number determination unit is used to determine the number of faulty phases on the opposite side based on the characteristic quantity on the opposite side when the number of faulty phases on this side is greater than or equal to a preset number of phases.

[0036] Thirdly, embodiments of the present invention also provide an electronic device, the electronic device comprising:

[0037] At least one processor; and

[0038] A memory communicatively connected to the at least one processor; wherein,

[0039] The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the neutral line N-line anomaly detection method as described in any of the first aspects above.

[0040] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing computer instructions, the computer instructions being configured to cause a processor to execute and implement the neutral line N-line anomaly detection method as described in any one of the first aspects.

[0041] In this embodiment of the invention, the number of faulty phases on the local side is determined based on local characteristic quantities; when the number of faulty phases on the local side is greater than or equal to a preset number of phases, the number of faulty phases on the opposite side is determined based on the opposite side characteristic quantities; when the number of faulty phases on the local side is greater than the number of faulty phases on the opposite side, it is determined whether the voltage of the redundant faulty phases on the local side meets the normal phase voltage range; if the voltage of the redundant faulty phases on the local side meets the normal phase voltage range, it is determined that the neutral line N line is abnormal. Thus, this solution realizes intelligent detection of N line connection abnormalities in the zero-sequence circuit. Attached Figure Description

[0042] Figure 1 This is the protection principle diagram of phase A of the line protection in the existing technology;

[0043] Figure 2 This is a flowchart of a neutral line (N-line) anomaly detection method provided in an embodiment of the present invention;

[0044] Figure 3 This is a flowchart of another neutral line (N-line) anomaly detection method provided in an embodiment of the present invention;

[0045] Figure 4 This is a flowchart of another neutral line (N-line) anomaly detection method provided in an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the structure of a neutral line (N-line) anomaly detection device provided in an embodiment of the present invention;

[0047] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] Figure 2This is a flowchart of a neutral line (N-line) anomaly detection method provided by an embodiment of the present invention. This embodiment is applicable to detecting whether an anomaly has occurred in the neutral line (N-line). This method can be executed by a neutral line (N-line) anomaly detection device, such as... Figure 2 As shown, the specific steps include the following:

[0050] S110. Determine the number of faulty phases on this side based on the characteristic quantities of this side.

[0051] The power system includes primary equipment, three-phase (A, B, C) transmission lines, and secondary circuits. The output side of the primary equipment transmits power to the input side of the secondary circuit via the three-phase (A, B, C) transmission lines. The input sides of the three phases in the secondary circuit are combined into a neutral line (N line) that returns to the output side of the primary equipment, forming a loop. When the three phases are balanced, the currents in the three phases (A, B, C) of the secondary current loop are equal in magnitude and 120° out of phase, resulting in a zero-sequence current (N line). When the three phases are unbalanced, the vector sum is not zero, generating a zero-sequence current that flows through the N line, forming a zero-sequence loop. However, when the three phases are unbalanced (due to a single-phase ground fault or a two-phase ground fault), if an anomaly occurs in the neutral line (N line), the zero-sequence current may flow back into the three-phase transmission lines.

[0052] A power system can reflect its transmission characteristics through electrical quantities on both the output and input sides. In this embodiment, the characteristic quantity on this side can be understood as the electrical characteristic quantity on the output side of the primary equipment in the power system, or the electrical characteristic quantity on the input side of the secondary circuit in the power system. If an abnormality is detected in the neutral (N) line on the output side of the primary equipment, then the characteristic quantity on this side is the electrical characteristic quantity on the output side of the primary equipment. If an abnormality is detected in the neutral (N) line on the output side of the secondary circuit, then the characteristic quantity on this side is the electrical characteristic quantity on the input side of the secondary circuit. Here, the characteristic quantity on this side can be determined based on which side's neutral (N) line is being detected as abnormal.

[0053] The characteristic quantities on this side include the magnitude of the current and the harmonic characteristics of the current. The number of faulty phases on this side can be determined based on the magnitude of the current or the harmonic characteristics of the current. Specifically, if the current in a certain phase on this side suddenly changes and the current magnitude exceeds the preset current, then this phase on this side is determined to be a faulty phase. If the harmonic characteristics of the current in a certain phase on this side are first harmonic characteristics and second harmonic characteristics, then this phase on this side is determined to be a faulty phase. By checking the fault status of each phase on this side in this manner, the total number of faulty phases on this side can be specifically determined by the magnitude of the current and the harmonic characteristics of the current.

[0054] S120. When the number of faulty phases on this side is greater than or equal to the preset number of phases, the number of faulty phases on the opposite side is determined based on the characteristic quantities on the opposite side.

[0055] Among them, the number of faulty phases on this side is at least the preset number of phases. If the preset number of phases is two phases, then the number of faulty phases on this side can be two phases or three phases; that is, the number of faulty phases on this side can be any two phases A, B, and C, or the number of faulty phases on this side can be three phases A, B, and C.

[0056] The characteristics of the opposite side depend on which side's neutral (N) line is being detected as abnormal. Specifically, if the detection is for an abnormality in the N line on the output side of the primary equipment, then the characteristic of this side is the electrical characteristic of the primary equipment's output side; the characteristic of the opposite side is the electrical characteristic of the input side in the secondary circuit. If the detection is for an abnormality in the N line on the output side of the secondary circuit, then the characteristic of this side is the electrical characteristic of the secondary circuit's input side; the characteristic of the opposite side is the electrical characteristic of the primary equipment's output side. The characteristics of the opposite side include the magnitude of the opposite side current and the harmonic characteristics of the opposite side current; the number of faulty phases on the opposite side can be determined based on the magnitude of the opposite side current or the harmonic characteristics of the opposite side current.

[0057] S130. When the number of faulty phases on this side is greater than the number of faulty phases on the opposite side, determine whether the voltage of the excess faulty phases on this side meets the normal phase voltage range.

[0058] Generally, when a fault occurs in phase A on this side, meaning a sudden change in the current on this side, the faulty phase A on the opposite side will also experience a corresponding sudden change through the three-phase transmission line, making phase A on the opposite side also a faulty phase. When the number of faulty phases on this side is greater than the number of faulty phases on the opposite side—that is, when there are two faulty phases on this side, there is one faulty phase on the opposite side; when there are three faulty phases on this side, there are two or one faulty phases on the opposite side—this confirms that the common faulty phase is caused by a sudden change in characteristic quantity, rather than a zero-sequence current return caused by an abnormality in the neutral (N) line. For example, when the number of faulty phases on this side is two (A and B), the number of faulty phases on the opposite side is one (A) or one (B); when the number of faulty phases on this side is three (A, B, and C), the number of faulty phases on the opposite side is two (A and B), or two (A and C), or two (B and C), or one (A), one (B), or one (C). When the number of faulty phases on this side is less than the number of faulty phases on the opposite side, the N-line abnormality cannot be detected.

[0059] It should be noted here that the redundant fault phase on this side is the fault phase on this side that is more than the fault phase on the opposite side. For example, if the number of fault phases on this side is two phases A and B, and the number of fault phases on the opposite side is one phase A, then the redundant fault phase on this side is phase B; if the number of fault phases on this side is two phases A and B, and the number of fault phases on the opposite side is one phase B, then the redundant fault phase on this side is phase A; when the number of fault phases on this side is three phases A, B, and C, and the number of fault phases on the opposite side is two phases A and B, then the redundant fault phase on this side is phase C.

[0060] When the number of faulty phases on this side is greater than the number of faulty phases on the opposite side, redundant faulty phases on this side can be identified. Furthermore, based on whether the voltage of the redundant faults on this side meets the normal phase voltage range, it can be determined whether the neutral line is abnormal.

[0061] S140. If the voltage of the excess faulty phase on this side meets the normal phase voltage range, then it is determined that the neutral line N line is abnormal.

[0062] Specifically, when the voltage of the redundant faulty phase on this side meets the normal phase voltage range, the fault caused by the abnormal neutral line (N line) will cause excess zero-sequence current to flow back to the redundant faulty phase on this side, thus confirming an abnormality in the neutral line (N line). An N line abnormality can be due to poor contact or a disconnection. When the voltage of the redundant faulty phase on this side does not meet the normal phase voltage range, it is impossible to determine whether the neutral line (N line) is abnormal. In this way, this solution achieves intelligent detection of abnormal N line connection in the zero-sequence loop.

[0063] Based on the above embodiments, further optimizations are made. Figure 3 This is a flowchart of a neutral line (N-line) anomaly detection method provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the method includes the following steps:

[0064] S210. Determine the number of faulty phases on this side based on the characteristic quantities of this side.

[0065] S220. When the number of faulty phases on this side is greater than or equal to the preset number of phases, the number of faulty phases on the opposite side is determined based on the characteristic quantities on the opposite side.

[0066] S230. When the number of faulty phases on this side is greater than the number of faulty phases on the opposite side, determine whether the voltage of the excess faulty phases on this side meets the normal phase voltage range.

[0067] S240. If the voltage of the excess faulty phase on this side meets the normal phase voltage range, then it is determined that the neutral line N line is abnormal.

[0068] S250: Determine the system fault type as a three-phase unbalanced fault and send an alarm signal.

[0069] Among them, the system fault type can be determined as a three-phase asymmetrical fault type based on the characteristic quantities of this side and the characteristic quantities of the opposite side; specifically, refer to Figure 1The protection principle is as follows: when one phase characteristic quantity on this side and the corresponding opposite phase characteristic quantity both change abruptly and are in opposite phases, it is determined that a single-phase ground fault outside the zone has occurred in the three-phase line system; when one phase characteristic quantity on this side and the corresponding opposite phase characteristic quantity both change abruptly and are in the same phase, it is determined that a single-phase ground fault within the zone has occurred in the three-phase line system; when two phase characteristic quantities on this side and the corresponding opposite phase characteristic quantities both change abruptly and are in opposite phases, it is determined that a two-phase ground fault outside the zone has occurred in the three-phase line system; when two phase characteristic quantities on this side and the corresponding opposite phase characteristic quantities both change abruptly and are in the same phase, it is determined that a two-phase ground fault within the zone has occurred in the three-phase line system. These single-phase ground faults outside and within the zone, as well as two-phase ground faults outside and within the zone, belong to the three-phase asymmetrical fault type; while in the three-phase line system, when all three phase characteristic quantities on this side and the corresponding opposite phase characteristic quantities both change abruptly, it is determined that a three-phase symmetrical fault has occurred in the three-phase line system.

[0070] When a three-phase unbalanced fault occurs in a three-phase line system, and an anomaly is detected in the neutral line (N), the zero-sequence current may flow back into the three-phase transmission line, causing maloperation or failure to operate the protection system. Taking a single-phase A-phase external ground fault as an example, in existing technology, when a single-phase A-phase ground fault occurs in a three-phase line system, the ground fault current of the primary equipment in phase A increases dramatically, and the current in phase A in the secondary circuit increases accordingly, while phases B and C show little change. This three-phase imbalance results in a non-zero zero-sequence current. When a single-phase ground fault occurs in a three-phase line system, since the secondary currents on both sides of each phase are equal in magnitude and opposite in direction, their vector sum is close to zero, and the protection system reliably does not operate. However, if a single-phase ground fault occurs in a three-phase line system... When a fault occurs, if the neutral line (N) also malfunctions, the zero-sequence current generated by the three-phase imbalance cannot flow through the N line (when the line is broken) or only a small portion flows through the N line (when there is poor contact). At this time, all (or most) of the zero-sequence current can only be shunted in the other two phases (BC) current loops (i.e., each phase has the shunting of the zero-sequence current on the basis of the original current), resulting in serious changes in the current waveforms of phases BC (both magnitude and phase change significantly). For the current differential protection of phase B (or phase C), the currents on both sides no longer meet the condition of equal magnitude and opposite direction, and the vector sum is not zero. At this time, the protection judges that the protection has been activated, thus forming a protection malfunction event that is actually an external fault.

[0071] Taking a single-phase ground fault within a zone as an example, in the existing technology, when a single-phase A-phase ground fault occurs in a three-phase line system, since the secondary currents on both sides of each phase are equal in magnitude, the current changes abruptly and the voltage decreases, thus determining that the grounding impedance is small, and the protection will not start. However, when a single-phase ground fault occurs within a zone in a three-phase line system, and an anomaly occurs simultaneously in the neutral line N, the amplitude and phase of the three-phase currents change, causing the calculated grounding impedance value to increase, and the protection will then operate. This results in a protection maloperation event that is actually an external fault.

[0072] To address the aforementioned issues of protection malfunctions and failures to operate, this embodiment, based on the previous embodiment, intelligently detects abnormalities in the neutral line (N line) and sends an alarm signal when a three-phase asymmetry fault occurs in the three-phase line. On-site personnel will then promptly repair the neutral line (N line), thus preventing malfunctions and failures to operate the protection.

[0073] Optionally, based on the above embodiments, further refinements can be made. Figure 4 This is a flowchart illustrating another neutral line / N-line anomaly detection method provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the method includes the following steps:

[0074] S310. Determine the number of faulty phases on this side based on the characteristic quantities of this side.

[0075] S320. When the number of faulty phases on this side is greater than or equal to the preset number of phases, the number of faulty phases on the opposite side is determined based on the characteristic quantities on the opposite side.

[0076] S330. When the number of faulty phases on this side is greater than the number of faulty phases on the opposite side, determine whether the voltage of the excess faulty phases on this side meets the normal phase voltage range.

[0077] S350, detect the zero-sequence current on the neutral line N on this side.

[0078] S360. If the voltage of the excess faulty phase on this side meets the normal phase voltage range and the zero-sequence current is equal to 0, then the abnormality of the neutral line N line is determined to be a broken line abnormality.

[0079] Specifically, if an abnormality is detected in the neutral line N and the zero-sequence current is zero, then the abnormality in the neutral line N is determined to be a broken wire abnormality; if an abnormality is detected in the neutral line N and the zero-sequence current is non-zero, then the abnormality in the neutral line N is determined to be a poor contact abnormality.

[0080] S370: Determine the system fault type as a three-phase asymmetrical fault and send an alarm signal and a lockout protection action signal.

[0081] In this embodiment, the neutral line (N) is identified as a broken line. When a three-phase asymmetrical fault occurs in the three-phase line system, an alarm signal and a protection lockout action are sent. The protection lockout action is a command to prevent the protection from malfunctioning. When the alarm signal is sent, the on-site personnel will promptly repair the neutral line (N), preventing the protection from malfunctioning. Furthermore, the protection lockout action is sent, which is a command to prevent the protection from malfunctioning, thus completely avoiding the occurrence of protection malfunctions.

[0082] This invention also provides a neutral line / N-line anomaly detection device, which can execute the neutral line / N-line anomaly detection method provided in any embodiment of this invention, and has the corresponding functional modules and beneficial effects of the method. Figure 5 This is a schematic diagram of the structure of a neutral line (N-line) anomaly detection device provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the device includes:

[0083] The first phase number determination module 100 is used to determine the number of faulty phases on the local side based on the local side characteristic quantities;

[0084] The second phase number determination module 200 is used to determine the number of faulty phases on the opposite side based on the characteristic quantities of the opposite side when the number of faulty phases on this side is greater than or equal to the preset number of phases.

[0085] The voltage determination module 300 is used to determine whether the voltage of the excess faulty phases on this side meets the normal phase voltage range when the number of faulty phases on this side is greater than the number of faulty phases on the opposite side.

[0086] The N-line anomaly determination module 400 is used to determine that the neutral line (N-line) is abnormal when the voltage of the excess faulty phase on this side meets the normal phase voltage range.

[0087] Optional, also includes:

[0088] The detection module is used to detect the zero-sequence current on the neutral line N on this side;

[0089] The N-line anomaly determination module includes a disconnection anomaly determination unit. This unit is used to determine that a disconnection anomaly has occurred in the neutral line (N-line) when the voltage of the excess faulty phase on this side meets the normal phase voltage range and the zero-sequence current is equal to 0.

[0090] Optionally, the first phase number determination module includes a first phase number determination unit; the first phase number determination unit is used to determine the number of faulty phases on the local side based on the magnitude of the local current or the harmonic characteristics of the local current.

[0091] The second phase number determination module includes a second phase number determination unit; the second phase number determination unit is used to determine the number of faulty phases on the opposite side based on the characteristic quantities on the opposite side when the number of faulty phases on this side is greater than or equal to the preset number of phases.

[0092] This invention also provides an electronic device. Figure 6This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0093] like Figure 6 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0094] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0095] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the neutral line N-line anomaly detection method.

[0096] In some embodiments, the neutral line N-line anomaly detection method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the neutral line N-line anomaly detection method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the neutral line N-line anomaly detection method by any other suitable means (e.g., by means of firmware).

[0097] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0098] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0099] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0100] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0101] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0102] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0103] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0104] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

[0105] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for detecting anomalies in the neutral line (N-line), characterized in that, include: The number of faulty phases on this side is determined based on the characteristic quantities of this side. When the number of faulty phases on this side is greater than or equal to the preset number of phases, the number of faulty phases on the opposite side is determined based on the characteristic quantities on the opposite side. When the number of faulty phases on this side is greater than the number of faulty phases on the opposite side, determine whether the voltage of the excess faulty phases on this side meets the normal phase voltage range; Detect the zero-sequence current on the neutral line N on this side; If the voltage of the excess faulty phase on this side meets the normal phase voltage range, then it is determined that the neutral line N line is abnormal. If the voltage of the redundant faulty phase on this side meets the normal phase voltage range, then the neutral line N line is determined to be abnormal, including: if the voltage of the redundant faulty phase on this side meets the normal phase voltage range, and the zero-sequence current is equal to 0, then the neutral line N line is determined to be abnormal due to a broken wire.

2. The neutral line N line abnormality detection method according to claim 1, characterized by, After determining that the neutral line N line is abnormal, the following steps are also taken: determine that the system fault type is a three-phase unbalanced fault type, and send an alarm signal.

3. The neutral line N line abnormality detection method according to claim 1, characterized by, After determining that the anomaly in the neutral line (N line) is a breakage anomaly, the following steps are also included: The system fault type is determined to be a three-phase asymmetrical fault, and an alarm signal and a lockout protection action signal are sent.

4. The neutral line N line abnormality detection method according to claim 1, characterized by, The number of faulty phases on this side is determined based on the characteristic quantities of this side, including: The number of faulty phases and non-faulty phases on this side are determined based on the magnitude of the current on this side or the harmonic characteristics of the current on this side. Determining the number of faulty phases on the opposite side based on the characteristic quantities on the opposite side includes: determining the number of faulty phases on the opposite side based on the magnitude of the current on the opposite side or the harmonic characteristics of the current on the opposite side.

5. A neutral line (N line) abnormality detection device characterized by comprising: include: The first phase number determination module is used to determine the number of faulty phases on this side based on the characteristic quantities of this side. The second phase number determination module is used to determine the number of faulty phases on the opposite side based on the characteristic quantities of the opposite side when the number of faulty phases on the local side is greater than or equal to the preset number of phases. The voltage determination module is used to determine whether the voltage of the excess faulty phases on the local side meets the normal phase voltage range when the number of faulty phases on the local side is greater than the number of faulty phases on the opposite side. The detection module is used to detect the zero-sequence current on the neutral line N on this side; The N-line anomaly determination module is used to determine that the neutral line (N-line) is abnormal when the voltage of the excess faulty phase on this side meets the voltage range of the normal phase. The N-line anomaly determination module includes: a disconnection anomaly determination unit; The open circuit anomaly determination unit is used to determine that the neutral line (N line) has an open circuit anomaly when the voltage of the excess fault phase on this side meets the normal phase voltage range and the zero-sequence current is equal to 0.

6. The neutral line (N-line) anomaly detection device according to claim 5, characterized in that, The first phase number determination module includes: a first phase number determination unit; The first phase number determination unit is used to determine the number of faulty phases on the local side based on the magnitude of the local current or the harmonic characteristics of the local current. The second phase number determination module includes a second phase number determination unit. The second phase number determination unit is used to determine the number of faulty phases on the opposite side based on the characteristic quantity on the opposite side when the number of faulty phases on this side is greater than or equal to the preset number of phases.

7. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the neutral line N-line anomaly detection method according to any one of claims 1-4.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that are used to cause a processor to execute the neutral line N-line anomaly detection method according to any one of claims 1-4.

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