CN115932664A - A method, device, equipment, and storage medium for abnormality detection of neutral line and N line - Google Patents
A method, device, equipment, and storage medium for abnormality detection of neutral line and N line Download PDFInfo
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- CN115932664A CN115932664A CN202211574115.2A CN202211574115A CN115932664A CN 115932664 A CN115932664 A CN 115932664A CN 202211574115 A CN202211574115 A CN 202211574115A CN 115932664 A CN115932664 A CN 115932664A
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract
The invention discloses a neutral line N line abnormity detection method, a device, equipment and a storage medium. The method comprises the following steps: determining the number of local fault phases according to the local characteristic quantity; when the number of the fault phases at the side is larger than or equal to the preset number of the phases, determining the number of the fault phases at the opposite side according to the characteristic quantity at the opposite side; when the number of the fault phases at the side is larger than that of the fault phases at the opposite side, whether the voltage quantity of the redundant fault phases at the side meets a normal phase voltage range is determined; and if the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range, determining that the N line of the neutral line is abnormal. According to the scheme, the N-line connection abnormity of the zero-sequence loop can be intelligently detected.
Description
Technical Field
The embodiment of the invention relates to a three-phase line technology of a power grid, in particular to a neutral line N line abnormity detection method, a neutral line N line abnormity detection device, neutral line N line abnormity detection equipment and a storage medium.
Background
The power system protection loop comprises a current transformer secondary side coil and a protection device; the protection device is used for carrying out circuit system fault protection according to the current magnitude and the current direction of the ABC three-phase small coil acquisition current secondary circuit; the ABC three phases in the current secondary circuit are combined into a neutral line (N line) after coming out of the protection device and return to the central point of the secondary side coil of the current transformer to form a circuit. When the three phases are balanced, the ABC three-phase currents in the secondary current loop are equal in magnitude, the phase difference is 120 degrees, the three-phase vector sum is zero, and no current exists in the neutral line N line. When three phases are unbalanced, the vector sum is not zero, and zero sequence current is generated and flows through the N lines to form a zero sequence loop.
Specifically, in the fault protection of the circuit system, taking the differential protection of the phase current of the line protection a as an example, fig. 1 is a protection schematic diagram of the phase a of the line protection in the prior art, as shown in fig. 1, when a fault point occurs at a position K1 between a primary device and a protection device, and a current I at two sides is within a protection range M 、I N All are in positive directions (the current flowing out of the bus is taken as the positive direction as specified)) At the moment, the currents on the two sides of the phase are in the same phase, the amplitudes are superposed, the vector sum is large and exceeds a fixed value, the protection is judged to be an in-zone fault, the protection action is used for cutting off the switches on the two sides, and fault isolation is achieved. When a fault point occurs at a position K2 outside a protection area (namely at one end of primary equipment or one end of the output side of the protection device), the current I at one side at the moment M Is positive, a side current I N If the voltage is negative, the amplitudes are mutually offset, the vector sum is very small, the protection is judged to be an out-of-area fault, and the protection action is not started. If there is a single-phase internal fault or a single-phase external fault in the three-phase line, or a dual-phase internal fault or a dual-phase external fault, that is, when an asymmetric ground fault occurs in the three-phase line, if an abnormal N-line connection occurs in the zero-sequence circuit at the same time, a protection malfunction or a rejection of the protection device may occur.
At present, the missed (or poor contact) of the neutral line N of the secondary current loop causes the accident event of the misoperation of the protection device, the protection misoperation or even the failure of the protection after the equipment is put into operation, the great influence is generated on the safety of a power grid, and the disconnection of the neutral line N becomes a great hidden trouble. In the prior art, the N line connection abnormity of the secondary current loop cannot be technically and intelligently identified.
Disclosure of Invention
The invention provides a neutral line N-line abnormity detection method, a neutral line N-line abnormity detection device, neutral line N-line abnormity detection equipment and a storage medium, which are used for intelligently detecting neutral line N-line connection abnormity of a zero-sequence loop.
In a first aspect, an embodiment of the present invention provides a method for detecting an abnormality of an N-line of a neutral line, where the method includes:
determining the number of fault phases of the local side according to the characteristic quantity of the local side;
when the number of the local side fault phases is larger than or equal to the preset number of phases, determining the number of the opposite side fault phases according to the opposite side characteristic quantity;
when the number of the fault phases at the side is larger than that of the fault phases at the opposite side, whether the voltage quantity of the redundant fault phases at the side meets a normal phase voltage range is determined;
and if the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range, determining that the N line of the neutral line is abnormal.
Optionally, after determining that the neutral line N is abnormal, the method further includes:
and determining the system fault type as a three-phase asymmetric fault type, and sending an alarm signal.
Optionally, after determining whether the voltage amount of the redundant fault phase on the current side meets the normal phase voltage range, the method further includes:
detecting zero sequence current on the neutral line N line of the side;
if the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range, determining that the N line of the neutral line is abnormal, wherein the method comprises the following steps:
and if the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range and the zero sequence current is equal to 0, determining that the abnormal condition of the neutral line N line is a broken line abnormal condition.
Optionally, after it is determined that the abnormality of the neutral line N is a disconnection abnormality, the method further includes:
and determining the type of the system fault as a three-phase asymmetric fault, and sending an alarm signal and a locking protection action signal.
Optionally, determining the number of local fault phases according to the local characteristic quantity includes:
determining the number of fault phases of the current source according to the current source size of the current source or the harmonic characteristics of the current source;
determining the number of opposite side fault phases according to the opposite side characteristic quantity, wherein the method comprises the following steps:
the number of contralateral fault phases is determined according to the contralateral current magnitude or contralateral current harmonic characteristics.
In a second aspect, an embodiment of the present invention further provides a neutral line N-line abnormality detection apparatus, where the apparatus includes:
the first phase number determining module is used for determining the fault phase number of the local side according to the characteristic quantity of the local side;
the second phase number determining module is used for determining the number of opposite side fault phases according to the opposite side characteristic quantity when the number of local side fault phases is larger than or equal to the preset number of phases;
the voltage determining module is used for determining whether the voltage quantity of the redundant fault phase of the local side meets a normal phase voltage range or not when the number of the fault phases of the local side is larger than that of the fault phases of the opposite side;
and the N line abnormity determining module is used for determining that the N line of the neutral line is abnormal when the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range.
Optionally, the method further includes:
the detection module is used for detecting the zero sequence current on the neutral line N line at the side;
the N-line anomaly determination module includes: a disconnection abnormality determination unit;
and the disconnection abnormity determining unit is used for determining that the N line of the neutral line has disconnection abnormity when the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range and the zero sequence current is equal to 0.
Optionally, the first phase number determining module includes: a first phase number determination unit;
the first phase number determining unit is used for determining the number of the fault phases at the side according to the current magnitude at the side or the harmonic characteristic of the current magnitude at the side;
the second phase number determination module: a second phase number determination unit is included,
the second phase number determining unit is used for determining the number of opposite side fault phases according to the opposite side characteristic quantity when the number of local side fault phases is larger than or equal to a preset number of phases;
in a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform the method of detecting an abnormality of a neutral N-line according to any one of the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to, when executed, cause a processor to implement the neutral line N-line anomaly detection method according to any one of the first aspect.
According to the embodiment of the invention, the number of local side fault phases is determined according to the local side characteristic quantity; when the number of the local side fault phases is larger than or equal to the preset number of phases, determining the number of the opposite side fault phases according to the opposite side characteristic quantity; when the number of the fault phases at the side is larger than that of the fault phases at the opposite side, whether the voltage quantity of the redundant fault phases at the side meets a normal phase voltage range is determined; and if the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range, determining that the N line of the neutral line is abnormal, and thus the scheme realizes intelligent detection of the N line connection abnormality of the zero sequence loop.
Drawings
FIG. 1 is a prior art protection schematic for line protection phase A;
fig. 2 is a flowchart of a neutral line N-line anomaly detection method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method for detecting N-line anomalies in a neutral conductor according to an embodiment of the present invention;
fig. 4 is a flowchart of another method for detecting an abnormality of an N-line of a neutral line according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a neutral line N-line abnormality detection apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 2 is a flowchart of a method for detecting an abnormality of a neutral line N according to an embodiment of the present invention, where the method is applicable to detecting whether an abnormality occurs in the neutral line N, and the method may be executed by a neutral line N abnormality detecting device, as shown in fig. 2, and specifically includes the following steps:
and S110, determining the number of the local fault phases according to the local characteristic quantity.
The power system comprises primary equipment, an ABC three-phase power transmission line and a secondary circuit; the output side of the primary equipment transmits power to the input side of the secondary circuit through an ABC three-phase power transmission line; the input sides of the ABC three phases in the secondary circuit are also combined into a neutral line N line which returns to the output side of the primary equipment to form a circuit. If the three phases are balanced, the ABC three-phase currents in the secondary current loop are equal in magnitude, the phase difference is 120 degrees, the three-phase vector sum is zero, and no current exists in the neutral line N line. When three phases are unbalanced, the vector sum is not zero, and zero sequence current is generated and flows through the N lines to form a zero sequence loop. When three phases are unbalanced (single-phase ground fault or two-phase ground fault), if the neutral line N is abnormal, zero-sequence current may flow back into the three-phase transmission line.
The power transmission characteristics in the power system can be reflected by the electrical quantities on the output side and the input side of the power system. The present-side characteristic quantity in the present embodiment may be understood as an electrical characteristic quantity on the output side of the primary equipment in the power system, or an electrical characteristic quantity on the input side in the secondary circuit of the power system; if detecting whether the N line on the output side of the primary equipment is abnormal, the characteristic quantity of the primary equipment is the electrical characteristic quantity on the output side of the primary equipment; if detecting whether the N line on the output side of the secondary circuit is abnormal, the characteristic quantity on the current side is the electrical characteristic quantity on the input side of the secondary circuit; the present-side characteristic amount may be determined depending on which side neutral line N abnormality is specifically detected.
The local side characteristic quantity comprises the current magnitude of the local side and the harmonic characteristic of the current magnitude of the local side; the number of the fault phases at the side can be determined according to the magnitude of the current magnitude at the side or the harmonic characteristics of the current magnitude at the side; specifically, if the current magnitude of a certain phase of the current at the current side is suddenly changed and is greater than the preset current magnitude, the phase at the current side is determined to be a fault phase; and if the harmonic characteristic of the current quantity of the certain phase at the current side is the first harmonic characteristic and the second harmonic characteristic, determining that the phase at the current side is a fault phase. The fault conditions of the phases of the current side are sequentially detected, namely the total number of the fault phases of the current side can be specifically determined through the current magnitude of the current side and the harmonic wave characteristics of the current magnitude of the current side.
And S120, when the number of the fault phases on the side is larger than or equal to the preset number of the phases, determining the number of the fault phases on the opposite side according to the opposite side characteristic quantity.
The number of the fault phases at the side is at least a preset number of phases, and the preset number of phases is two phases, so that the number of the fault phases at the side can be two phases or three phases; that is, the number of the fault phases at the side can be any two phases A, B and C, or the number of the fault phases at the side can be three phases A, B and C.
The opposite-side characteristic amount may depend on which side neutral line N-line abnormality is specifically detected. Specifically, if detecting whether an abnormality occurs in the N line on the output side of the primary equipment, the local characteristic quantity is an electrical characteristic quantity on the output side of the primary equipment; the opposite side characteristic quantity is the electrical characteristic quantity of the input side in the secondary circuit; if the abnormality of the N line on the output side of the secondary circuit is detected, the characteristic quantity on the current side is the electrical characteristic quantity on the input side of the secondary circuit, and the characteristic quantity on the opposite side is the electrical characteristic quantity on the output side of the primary equipment. The contralateral characteristic quantity comprises contralateral current magnitude and contralateral current harmonic characteristics; the number of contralateral fault phases may be determined from the contralateral current magnitude, or contralateral current harmonic characteristics.
And S130, when the number of the fault phases on the current side is larger than that of the fault phases on the opposite side, determining whether the voltage quantity of the redundant fault phases on the current side meets a normal phase voltage range.
Generally, when the phase a of the local fault phase fails, that is, when the current amount of the local fault phase suddenly changes, the phase a of the opposite fault phase suddenly changes correspondingly through the three-phase transmission line, and the phase a of the opposite side is also the fault phase. When the number of the fault phases at the side is greater than that at the opposite side, namely when the number of the fault phases at the side is two, the number of the fault phases at the opposite side is one; if the number of the fault phases on the side is three, the number of the fault phases on the opposite side is two or one, so that the common fault phase is determined to be zero-sequence current backflow caused by sudden change of characteristic quantity rather than N-line abnormality. Illustratively, when the number of fault phases on the side is two phases A and B, the number of fault phases on the opposite side is one phase of the phase A or one phase of the phase B; when the number of the fault phases at the side is three phases A, B and C, and the number of the fault phases at the opposite side is two phases A and B, or two phases A and C, or two phases B and C, or one phase A, one phase B, or one phase C. And when the number of the fault phases on the side is smaller than that on the opposite side, the N-line abnormality cannot be detected.
It should be noted here that the own-side redundant fault phase is an own-side fault phase which is redundant with respect to the opposite-side fault phase; illustratively, if the number of fault phases at the side is two phases A and B, the number of fault phases at the opposite side is one phase A; the redundant fault phase at the side is the B phase; if the number of the fault phase at the side is A and B phases, the number of the fault phase at the opposite side is B phase one phase; the redundant fault phase at the side is the A phase; when the number of the fault phases at the side is three phases A, B and C and the number of the fault phases at the opposite side is two phases A and B, the redundant fault phase at the side is the phase C.
When the number of the fault phases at the side is larger than that of the fault phases at the opposite side, the redundant fault phases at the side can be determined, and whether the N line is abnormal can be further judged according to whether the voltage quantity of the redundant fault phases at the side meets the normal phase voltage range.
And S140, if the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range, determining that the neutral line N line is abnormal.
When the voltage of the redundant fault phase at the local side meets the normal phase voltage range, redundant zero-sequence current caused by abnormal N lines flows back to the redundant fault phase at the local side due to the fault of the redundant fault phase at the local side, the fact that the N lines of the neutral line are abnormal can be determined, and the abnormal N lines can be poor contact and N line disconnection. When the voltage quantity of the redundant fault phase at the side does not meet the normal phase voltage range, whether the neutral line N is abnormal or not cannot be judged. According to the scheme, the N-line connection abnormity of the zero-sequence loop can be intelligently detected.
Based on the above embodiment, further optimization is performed, and fig. 3 is a flowchart of detecting an abnormality of an N-line of a neutral line according to an embodiment of the present invention, as shown in fig. 3, the method includes the following steps:
and S210, determining the number of the local fault phases according to the local characteristic quantity.
And S220, when the number of the fault phases on the side is larger than or equal to the preset number of the phases, determining the number of the fault phases on the opposite side according to the opposite side characteristic quantity.
And S230, when the number of the fault phases at the side is larger than that of the fault phases at the opposite side, determining whether the voltage quantity of the redundant fault phases at the side meets a normal phase voltage range.
And S240, if the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range, determining that the neutral line N line is abnormal.
And S250, determining the system fault type as a three-phase asymmetric fault type, and sending an alarm signal.
The system fault type can be determined to be a three-phase asymmetric fault type according to the local side characteristic quantity and the opposite side characteristic quantity; specifically, referring to the protection principle of fig. 1, when one phase characteristic quantity and the corresponding opposite side characteristic quantity are suddenly changed at the local side and the phases are opposite, it is determined that a single-phase earth fault outside the area occurs in the three-phase line system; when one phase characteristic quantity and the corresponding opposite side characteristic quantity are suddenly changed and the phases are the same, determining that the single-phase earth fault occurs in the three-phase line system occurrence area; when the two-phase characteristic quantity and the corresponding opposite-side characteristic quantity are suddenly changed at the side and the phases are opposite, determining that the two-phase ground fault outside the area of the three-phase line system occurs; when the two-phase characteristic quantity and the corresponding opposite-side characteristic quantity are suddenly changed at the side and the phases are the same, determining that two-phase ground faults occur in the generating area of the three-phase line system; the out-of-area and in-area single-phase earth faults and the out-of-area and in-area two-phase earth faults belong to three-phase asymmetric fault types; and in the three-phase line system, when the three-phase characteristic quantity and the corresponding opposite-side characteristic quantity are suddenly changed, determining that the three-phase line system has a three-phase symmetrical fault.
When a three-phase asymmetric fault occurs in a three-phase line system and the abnormality of a neutral line N line is detected, zero-sequence current may flow back to a three-phase transmission line, so that the false operation and the rejection operation of protection actions are caused; here, taking a single-phase a-phase region external ground fault as an example, in the prior art, when a single-phase a-phase ground fault occurs in a three-phase line system, a phase a primary equipment ground short circuit current sharply increases, a phase a current in a secondary circuit correspondingly increases, a phase BC current is not large, and a three-phase is unbalanced, so a zero-sequence current is not zero; when a single-phase earth fault occurs in a three-phase line system, the protection is reliable and does not act because the secondary currents on two sides of each phase in three phases are equal in magnitude and opposite in direction, and the vector sum is close to zero; if a single-phase earth fault occurs in a three-phase line system, and an abnormal condition occurs in a neutral line N line at the same time, zero-sequence current formed by three-phase unbalance cannot flow through the N line (when the line is broken) or only a small amount of part of the zero-sequence current flows through the N line (when the contact is poor), at the moment, all (or most) of the zero-sequence current can only be shunted in another two-phase (BC) current loop (namely, each phase is shunted on the phase by overlapping the zero-sequence current on the original current), so that the waveform of the BC two-phase current is seriously changed (the magnitude and the phase are both greatly changed), at the moment, for current differential protection of a B phase (or a C phase), the currents on the two sides of the current differential protection do not meet the conditions of equal magnitude and opposite directions any more, the vector sum is not zero, at the moment, the protection is judged to be protection action, and thus, a protection misoperation event which is actually an out-of-area fault is formed.
Taking a single-phase area grounding fault as an example, in the prior art, when a single-phase A-phase grounding fault occurs in a three-phase line system, as the secondary currents on two sides of each phase in three phases are equal in magnitude, the currents suddenly change, the voltages are all reduced, it is determined that the grounding impedance is small, and the protection action is taken as no start; when a single-phase earth fault occurs in a region in a three-phase line system, and an N line of a neutral line is abnormal at the same time, the amplitude and the phase of three-phase current are changed, the calculated earth impedance value is increased, the protection action is an action, and thus a protection misoperation event which is actually an out-of-region fault is formed.
In order to solve the problem of protection malfunction and rejection, the embodiment intelligently detects the abnormality of the neutral line N line on the basis of the embodiment, and sends an alarm signal when a three-phase asymmetric fault occurs in a three-phase line, so that field personnel can timely maintain the neutral line N line, and malfunction and rejection of protection actions are avoided.
Optionally, on the basis of the foregoing embodiment, further refinement is performed, and fig. 4 is a schematic flow chart of another method for detecting an abnormality of an N-line of a neutral line according to an embodiment of the present invention, as shown in fig. 4, the method includes the following steps:
and S310, determining the number of the fault phases at the current side according to the characteristic quantity at the current side.
And S320, when the number of the fault phases on the side is larger than or equal to the preset number of the phases, determining the number of the fault phases on the opposite side according to the opposite side characteristic quantity.
S330, when the number of the fault phases on the current side is larger than that of the fault phases on the opposite side, whether the voltage quantity of the redundant fault phases on the current side meets the normal phase voltage range or not is determined.
And S350, detecting the zero sequence current on the neutral line N line at the side.
And S360, if the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range and the zero sequence current is equal to 0, determining that the abnormal condition of the neutral line N line is a broken line abnormal condition.
When the neutral line N is detected to be abnormal, zero sequence current is detected to be zero, and the neutral line N is determined to be abnormal in line breaking; and if the zero-sequence current is detected to be nonzero after the neutral line N is detected to be abnormal, determining that the neutral line N is abnormal and is in poor contact.
And S370, determining the system fault type as a three-phase asymmetric fault type, and sending an alarm signal and a locking protection action signal.
The method comprises the steps of judging that the neutral line N line abnormality is a line break abnormality, and sending an alarm signal and a locking protection action when a three-phase asymmetric fault occurs in a three-phase line system, wherein the locking protection action is used as a protection action misoperation preventing instruction; when the alarm signal is sent, field personnel can timely maintain the neutral line N line, the misoperation of the protection action is avoided, the locking protection action is further sent, namely the misoperation instruction of the protection action is sent, and the misoperation of the protection action can be completely avoided.
The embodiment of the invention also provides a neutral line N line abnormity detection device which can execute the neutral line N line abnormity detection method provided by any embodiment of the invention and has corresponding functional modules and beneficial effects of the execution method. Fig. 5 is a schematic structural diagram of a neutral line N-line abnormality detection apparatus according to an embodiment of the present invention, and as shown in fig. 5, the apparatus includes:
a first phase number determining module 100, configured to determine a local side fault phase number according to the local side characteristic quantity;
the second phase number determining module 200 is configured to determine the number of opposite-side fault phases according to the opposite-side characteristic quantity when the number of local-side fault phases is greater than or equal to a preset number of phases;
the voltage determining module 300 is configured to determine whether the voltage amount of the redundant fault phase at the current side meets a normal phase voltage range when the number of the fault phases at the current side is greater than the number of the fault phases at the opposite side;
and the N line abnormality determining module 400 is configured to determine that the N line of the neutral line is abnormal when the voltage amount of the redundant fault phase at the current side meets the normal phase voltage range.
Optionally, the method further includes:
the detection module is used for detecting the zero sequence current on the neutral line N line at the side;
the N line abnormity determining module comprises a line break abnormity determining unit and a line break abnormity determining unit, wherein the line break abnormity determining unit is used for determining that the line break abnormity occurs in the neutral line N line when the voltage quantity of the redundant fault phase at the side meets the normal phase voltage range and the zero sequence current is equal to 0.
Optionally, the first phase number determining module includes a first phase number determining unit; the first phase number determining unit is used for determining the number of the fault phases at the current side according to the current magnitude at the current side or the harmonic characteristics of the current magnitude at the current side;
the second phase number determination module comprises a second phase number determination unit; the second phase number determining unit is used for determining the number of opposite side fault phases according to the opposite side characteristic quantity when the number of local side fault phases is larger than or equal to the preset number of phases;
an embodiment of the present invention further provides an electronic device, and fig. 6 is a schematic structural diagram of the electronic device provided in the embodiment of the present invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 6, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor 11 can perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from a storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data necessary for the operation of the electronic apparatus 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
A number of components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, or the like; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
In some embodiments, the neutral N-line anomaly detection method may be implemented as a computer program tangibly embodied 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 onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the neutral N-wire anomaly detection method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the neutral N-line anomaly detection method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing 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, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here 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 a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a 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 may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116482565A (en) * | 2023-04-26 | 2023-07-25 | 广东电网有限责任公司 | A method, device, equipment and storage medium for abnormal detection of power supply |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005720A (en) * | 2010-10-21 | 2011-04-06 | 重庆大学 | Neutral line breakage detection protection method and device |
| CN201797374U (en) * | 2010-08-31 | 2011-04-13 | 重庆市电力公司 | Intelligent protection device for neutral line fault and open phase |
| CN106124920A (en) * | 2016-06-28 | 2016-11-16 | 国网河南桐柏县供电公司 | Transformator neutral conductor virtual connection fault detection method |
| WO2018191436A1 (en) * | 2017-04-11 | 2018-10-18 | Aclara Technologies, Llc | Floating neutral detection and localization system and methods |
| US20190072603A1 (en) * | 2016-12-30 | 2019-03-07 | Abb Schweiz Ag | Method and control system for faulted phase detection |
| CN111999678A (en) * | 2020-07-24 | 2020-11-27 | 南京国电南自电网自动化有限公司 | Three-phase PT secondary circuit neutral point N-line disconnection judging method and system |
| CN113238172A (en) * | 2021-04-02 | 2021-08-10 | 中国南方电网有限责任公司超高压输电公司梧州局 | Current transformer neutral wire abnormity judgment method based on neutral wire resistance |
| CN114019417A (en) * | 2021-11-09 | 2022-02-08 | 国家电网有限公司西北分部 | Line protection current loop neutral line open circuit detection method |
| CN216160806U (en) * | 2021-09-16 | 2022-04-01 | 应急管理部沈阳消防研究所 | A neutral wire disconnection detection module and an electrical fire early warning system |
-
2022
- 2022-12-08 CN CN202211574115.2A patent/CN115932664A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201797374U (en) * | 2010-08-31 | 2011-04-13 | 重庆市电力公司 | Intelligent protection device for neutral line fault and open phase |
| CN102005720A (en) * | 2010-10-21 | 2011-04-06 | 重庆大学 | Neutral line breakage detection protection method and device |
| CN106124920A (en) * | 2016-06-28 | 2016-11-16 | 国网河南桐柏县供电公司 | Transformator neutral conductor virtual connection fault detection method |
| US20190072603A1 (en) * | 2016-12-30 | 2019-03-07 | Abb Schweiz Ag | Method and control system for faulted phase detection |
| WO2018191436A1 (en) * | 2017-04-11 | 2018-10-18 | Aclara Technologies, Llc | Floating neutral detection and localization system and methods |
| CN111999678A (en) * | 2020-07-24 | 2020-11-27 | 南京国电南自电网自动化有限公司 | Three-phase PT secondary circuit neutral point N-line disconnection judging method and system |
| CN113238172A (en) * | 2021-04-02 | 2021-08-10 | 中国南方电网有限责任公司超高压输电公司梧州局 | Current transformer neutral wire abnormity judgment method based on neutral wire resistance |
| CN216160806U (en) * | 2021-09-16 | 2022-04-01 | 应急管理部沈阳消防研究所 | A neutral wire disconnection detection module and an electrical fire early warning system |
| CN114019417A (en) * | 2021-11-09 | 2022-02-08 | 国家电网有限公司西北分部 | Line protection current loop neutral line open circuit detection method |
Non-Patent Citations (1)
| Title |
|---|
| 黄少锋;陈搏威;伍叶凯;: "电流互感器中性线电阻增大对线路差动保护的影响", 电力系统自动化, no. 23, 30 September 2017 (2017-09-30), pages 83 - 88 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116482565A (en) * | 2023-04-26 | 2023-07-25 | 广东电网有限责任公司 | A method, device, equipment and storage medium for abnormal detection of power supply |
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