CN109738739A - Fault detection method and device - Google Patents
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Abstract
The invention discloses a kind of fault detection method and devices.Wherein, this method comprises: detecting the negative-sequence current of target reactor using current transformer, and the negative sequence voltage of voltage transformer detection target reactor is utilized, wherein current transformer and voltage transformer are set to around the three-phase windings of target reactor；Obtain negative-sequence current and negative sequence voltage；Calculate the negative phase-sequence difference between negative-sequence current and negative sequence voltage；According to negative phase-sequence difference, determine whether target reactor occurs shorted-turn fault.The present invention solves the technical issues of whether reactor occurs shorted-turn fault can not be detected in the related technology.
Description
Technical Field
The invention relates to the technical field of fault detection, in particular to a fault detection method and device.
Background
In the related art, the reactor on the high-voltage transmission line mainly plays a role in compensating the capacitor of the high-voltage transmission line and absorbing the reactive power of the high-voltage transmission line, and the end voltage is prevented from increasing due to excessive capacitive power when the power grid is in light load. The reactor works online for a long time, bears high voltage and heavy current online operation for a long time, and has severe working conditions, so that the reactor is more prone to failure compared with other equipment with the same voltage grade, and the reactor quits operation after failure, which can cause serious influence on the safety and stability of the whole system.
Parallel reactors on transmission lines are mainly connected in a star shape, the parallel reactors can be directly grounded and impedance grounded, wherein the direct grounding is more common, in the parallel reactors, insulation between two or more turns can fail when turn-to-turn short circuit faults occur, the phase current change of the parallel reactors is generally small when the turn-to-turn short circuit faults occur, if the phase current change is not found in time, the turn-to-turn short circuit faults can be developed into more serious faults, however, because the phase current change of the reactors is small, a sensitive and reliable protection scheme is difficult to design to detect the low-level turn-to-turn short circuit faults, and the turn-to-turn short circuit fault detection is also a difficult problem of control windings of equipment such as power transformers and synchronous motors.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a fault detection method and a fault detection device, which at least solve the technical problem that whether a reactor has turn-to-turn short circuit fault cannot be detected in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a fault detection method, including: detecting a negative sequence current of a target reactor by using a current transformer, and detecting a negative sequence voltage of the target reactor by using a voltage transformer, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor; acquiring the negative sequence current and the negative sequence voltage; calculating a negative sequence difference between the negative sequence current and the negative sequence voltage; and determining whether the target reactor has turn-to-turn short circuit fault or not according to the negative sequence difference value.
Further, calculating a negative sequence difference value between the negative sequence current and the negative sequence voltage comprises: normalizing the negative sequence current and the negative sequence voltage to obtain normalized negative sequence current and normalized negative sequence voltage; a negative sequence difference between the normalized negative sequence current and the normalized negative sequence voltage is calculated.
Further, determining whether the target reactor has the turn-to-turn short circuit fault according to the negative sequence difference value comprises: when the negative sequence difference value is a preset value, determining that the target reactor works normally and no turn-to-turn short circuit fault occurs; and when the negative sequence difference value is not a preset value, determining that the target reactor has turn-to-turn short circuit fault.
Further, after determining that the target reactor has a turn-to-turn short circuit fault, the method further includes: calculating a phase angle of the negative sequence difference value; and determining the phase of the target reactor with the turn-to-turn short circuit fault according to the phase angle of the negative sequence difference value.
Further, the target reactor is a shunt reactor.
According to another aspect of the embodiments of the present invention, there is also provided a fault detection apparatus, including: the detection unit is used for detecting the negative sequence current of a target reactor by using a current transformer and detecting the negative sequence voltage of the target reactor by using a voltage transformer, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor; an acquisition unit configured to acquire the negative sequence current and the negative sequence voltage; a calculation unit for calculating a negative sequence difference between the negative sequence current and the negative sequence voltage; and the determining unit is used for determining whether the target reactor has turn-to-turn short circuit fault according to the negative sequence difference value.
Further, the calculation unit includes: the normalization module is used for performing normalization processing on the negative sequence current and the negative sequence voltage to obtain normalized negative sequence current and normalized negative sequence voltage; a calculation module to calculate a negative sequence difference between the normalized negative sequence current and the normalized negative sequence voltage.
Further, the determining unit includes: the first determining module is used for determining that the target reactor normally works and no turn-to-turn short circuit fault occurs when the negative sequence difference value is a preset value; and the second determining module is used for determining that the target reactor has turn-to-turn short circuit fault when the negative sequence difference value is not a preset value.
Further, the fault detection apparatus further includes: the second calculation module is used for calculating the phase angle of the negative sequence difference value after the turn-to-turn short circuit fault of the target reactor is determined; and the third determining module is used for determining the phase of the target reactor with the turn-to-turn short circuit fault according to the phase angle of the negative sequence difference value.
Further, the target reactor is a shunt reactor.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium for storing a program, wherein the program, when executed by a processor, controls a device in which the storage medium is located to perform any one of the above-mentioned fault detection methods.
According to another aspect of the embodiments of the present invention, there is also provided a processor, configured to execute a program, where the program executes to perform any one of the above-mentioned fault detection methods.
In the embodiment of the invention, a current transformer is used for detecting the negative sequence current of a target reactor, a voltage transformer is used for detecting the negative sequence voltage of the target reactor, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor, the negative sequence current and the negative sequence voltage are obtained, the negative sequence difference value between the negative sequence current and the negative sequence voltage is calculated, and whether the turn-to-turn short circuit fault occurs in the target reactor is determined according to the negative sequence difference value. In the embodiment, the negative sequence current of the reactor can be obtained through the current transformer, the negative sequence voltage of the reactor can be obtained through the voltage transformer, and then the difference value between the negative sequence voltage and the negative sequence current is calculated, so that whether the reactor has the turn-to-turn short circuit fault or not is judged, the efficiency and the accuracy for detecting the turn-to-turn short circuit fault of the reactor are improved, and the technical problem that whether the reactor has the turn-to-turn short circuit fault or not cannot be detected in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of fault detection according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a reactor according to an embodiment of the invention;
fig. 3 is a schematic diagram of another alternative fault detection arrangement according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The effect of current and inductance in a circuit to hinder an alternating current is called reactance.
The following embodiments of the present invention can be applied to fault detection of a reactor, and the present invention is described in detail with reference to a shunt reactor.
The shunt reactor and important electrical equipment commonly adopted in an extra-high voltage power grid play roles in avoiding self-excitation of a generator, limiting power frequency voltage rise, facilitating parallel connection at the same time, reducing operation overvoltage, limiting secondary arc current and balancing reactive power in the power grid.
The method for judging whether the turn-to-turn short circuit fault occurs or not through the difference value between the normalized negative sequence voltage and the normalized negative sequence current has high enough sensitivity and reliability, and can judge whether the turn-to-turn short circuit fault occurs or not even if the change of the phase current is small when the turn-to-turn short circuit fault occurs, and meanwhile, the phase where the turn-to-turn short circuit fault occurs can be judged according to the method.
Example one
In accordance with an embodiment of the present invention, there is provided a fault detection method embodiment, it should be noted that the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 1 is a flow chart of a fault detection method according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S102, detecting the negative sequence current of a target reactor by using a current transformer, and detecting the negative sequence voltage of the target reactor by using a voltage transformer, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor;
step S104, acquiring negative sequence current and negative sequence voltage;
step S106, calculating a negative sequence difference value between the negative sequence current and the negative sequence voltage;
and step S108, determining whether the target reactor has turn-to-turn short circuit fault according to the negative sequence difference value.
Through the steps, the current transformer can be used for detecting the negative sequence current of the target reactor, the voltage transformer is used for detecting the negative sequence voltage of the target reactor, the current transformer and the voltage transformer are arranged around the three-phase winding of the target reactor, the negative sequence current and the negative sequence voltage are obtained, the negative sequence difference value between the negative sequence current and the negative sequence voltage is calculated, and whether turn-to-turn short circuit fault occurs in the target reactor or not is determined according to the negative sequence difference value. In the embodiment, the negative sequence current of the reactor can be obtained through the current transformer, the negative sequence voltage of the reactor can be obtained through the voltage transformer, and then the difference value between the negative sequence voltage and the negative sequence current is calculated, so that whether the reactor has the turn-to-turn short circuit fault or not is judged, the efficiency and the accuracy for detecting the turn-to-turn short circuit fault of the reactor are improved, and the technical problem that whether the reactor has the turn-to-turn short circuit fault or not cannot be detected in the related technology is solved.
The above steps will be described in detail below.
In the embodiments of the present invention, the types of reactors include a plurality of types, and the following embodiments of the present invention explain the present invention in a star connection reactor. In the embodiment of the invention, the target reactor is a parallel reactor.
FIG. 2 is a schematic diagram of a reactor according to an embodiment of the present invention, where the reactor is a star-connected reactor, and the reactor is directly grounded, as shown in FIG. 2, IA，IB，ICRepresents the phase current, VA，VB，VCRepresenting the phase voltage, ZA，ZB，ZCRepresenting the resistance.
And S102, detecting the negative sequence current of the target reactor by using a current transformer, and detecting the negative sequence voltage of the target reactor by using a voltage transformer, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor.
When a turn-to-turn short circuit fault occurs in a shunt reactor, the reactor can generate negative sequence current and negative sequence voltage. As can be seen from fig. 2, the phase currents can be represented as:
and zero, positive and negative sequence voltages can be expressed as:
wherein,is a constant.
Optionally, the current transformer and the voltage transformer may be installed outside a three-phase winding of the reactor.
And step S104, acquiring negative sequence current and negative sequence voltage.
In step S106, a negative sequence difference value between the negative sequence current and the negative sequence voltage is calculated.
Optionally, calculating the negative sequence difference between the negative sequence current and the negative sequence voltage comprises: carrying out normalization processing on the negative sequence current and the negative sequence voltage to obtain normalized negative sequence current and normalized negative sequence voltage; a negative sequence difference value between the normalized negative sequence current and the normalized negative sequence voltage is calculated.
From what is shown in fig. 2, the normalized negative sequence voltage can be expressed as:and the normalized negative-sequence current can be expressed as:in combination with the relation between the sequence voltage and the phase voltage, one can further derive:
when the reactor is in normal operation, the reactor is three-phase symmetrical, i.e. ZA＝ZB＝ZCZ, it can be seen that:
and step S108, determining whether the target reactor has turn-to-turn short circuit fault according to the negative sequence difference value.
Namely, the difference value of the normalized negative sequence voltage and the normalized negative sequence current can be used as the basis for judging whether the reactor has turn-to-turn short circuit or not. The difference of the normalized negative sequence voltage and negative sequence current can be obtained corresponding to the above equation:
Diff＝V2-normalized-I2-normalized。
optionally, determining whether the target reactor has the turn-to-turn short circuit fault according to the negative sequence difference includes: when the negative sequence difference value is a preset value, determining that the target reactor works normally and no turn-to-turn short circuit fault occurs; and when the negative sequence difference value is not a preset value, determining that the turn-to-turn short circuit fault occurs in the target reactor.
①, when the reactor is in a normal operation state:
Diffsteady＝V2-normalized-I2-normalized＝0。
② when the reactor has turn-to-turn short circuit fault (assuming that the B phase has turn-to-turn short circuit fault), the reduction of the B phase impedance is Δ ZBTo show, then there are:
therefore, when the reactor has a turn-to-turn short circuit fault:
Diff＝V2-normalized-I2-normalizedand not equal to 0, at the moment, whether the turn-to-turn short circuit fault occurs in the reactor can be judged according to whether the difference value of the normalized negative sequence voltage and the normalized negative sequence current is 0 or not.
Further, after determining that the target reactor has the turn-to-turn short circuit fault, the method further includes: calculating the phase angle of the negative sequence difference value; and determining the phase of the target reactor with the turn-to-turn short circuit fault according to the phase angle of the negative sequence difference value.
Optionally, when a turn-to-turn short circuit fault is found, the fault phase is found out by a phase selection method, and the phase angle of the phase selection method is represented as Diffangle：
Diffangle＝∠(Diff-Diffsteady)＝∠(V2-normalized-I2-normalized)，
When the A phase has turn-to-turn short circuit fault, we can obtain:
when the phase B has turn-to-turn short circuit fault, we can obtain:
when the turn-to-turn short circuit fault occurs to the phase C, we can obtain:
the angle obtained by the above formula is within a margin of +/-30 degrees, and finally the following conclusion is obtained:
when the angle is less than or equal to 150 degrees DiffangleWhen the angle is less than or equal to 210 degrees, turn-to-turn short circuit fault occurs in phase A;
when 270 degrees is less than or equal to DiffangleWhen the angle is less than or equal to 330 degrees, turn-to-turn short circuit fault occurs in phase B;
when the angle is less than or equal to 30 degrees, DiffangleWhen the angle is less than or equal to 90 degrees, turn-to-turn short circuit fault occurs in the C phase.
Through the implementation mode, the turn-to-turn short circuit fault detection method of the parallel reactor can be determined to solve the problem of turn-to-turn short circuit fault protection of the parallel reactor, whether the reactor has turn-to-turn short circuit fault can be easily judged through the difference value of the normalized negative sequence voltage and the normalized negative sequence current, and the fault phase is judged by the phase angle to realize the purpose of protecting the reactor by utilizing the negative sequence component, in the embodiment of the invention, a current transformer and a voltage transformer can be arranged outside the three-phase winding of the fault shunt reactor, the negative sequence current of the reactor is obtained through the current transformer, the negative sequence voltage of the reactor is obtained through the voltage transformer, because the amplitude difference between the negative sequence voltage and the negative sequence current is too large, the normalization processing is convenient for comparison, and judging whether the reactor has turn-to-turn short circuit fault or not by calculating the difference value between the normalized negative sequence voltage and the normalized negative sequence current. If the difference value between the normalized negative sequence voltage and the normalized negative sequence current is zero, the reactor is in a normal working state, otherwise, the reactor is in turn-to-turn short circuit fault.
The technical scheme is that the phase angle of the difference value of the normalized negative sequence voltage and the normalized negative sequence current is calculated to judge which phase the turn-to-turn short circuit fault occurs in the reactor.
The invention is illustrated below by means of a further alternative embodiment.
Example two
Fig. 3 is a schematic diagram of another alternative fault detection apparatus according to an embodiment of the present invention, as shown in fig. 3, the apparatus may include:
a detection unit 31 for detecting a negative sequence current of a target reactor by using a current transformer, and detecting a negative sequence voltage of the target reactor by using a voltage transformer, wherein the current transformer and the voltage transformer are disposed around a three-phase winding of the target reactor;
an acquisition unit 33 for acquiring a negative sequence current and a negative sequence voltage;
a calculation unit 35 for calculating a negative sequence difference value between the negative sequence current and the negative sequence voltage;
and the determining unit 37 is configured to determine whether the target reactor has a turn-to-turn short circuit fault according to the negative sequence difference.
The fault detection device can detect the negative sequence current of a target reactor by using the current transformer through the detection unit 31, detect the negative sequence voltage of the target reactor by using the voltage transformer, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor, obtain the negative sequence current and the negative sequence voltage by the obtaining unit 33, calculate the negative sequence difference value between the negative sequence current and the negative sequence voltage by the calculating unit 35, and determine whether the target reactor has an inter-turn short circuit fault according to the negative sequence difference value by the determining unit 37. In the embodiment, the negative sequence current of the reactor can be obtained through the current transformer, the negative sequence voltage of the reactor can be obtained through the voltage transformer, and then the difference value between the negative sequence voltage and the negative sequence current is calculated, so that whether the reactor has the turn-to-turn short circuit fault or not is judged, the efficiency and the accuracy for detecting the turn-to-turn short circuit fault of the reactor are improved, and the technical problem that whether the reactor has the turn-to-turn short circuit fault or not cannot be detected in the related technology is solved.
Optionally, the computing unit includes: the normalization module is used for performing normalization processing on the negative sequence current and the negative sequence voltage to obtain normalized negative sequence current and normalized negative sequence voltage; a calculation module to calculate a negative sequence difference between the normalized negative sequence current and the normalized negative sequence voltage.
Alternatively, the determining unit includes: the first determining module is used for determining that the target reactor works normally and no turn-to-turn short circuit fault occurs when the negative sequence difference value is a preset value; and the second determining module is used for determining that the target reactor has turn-to-turn short circuit fault when the negative sequence difference value is not a preset value.
In addition, the failure detection device further includes: the second calculation module is used for calculating the phase angle of the negative sequence difference value after the turn-to-turn short circuit fault of the target reactor is determined; and the third determining module is used for determining the phase of the target reactor with the turn-to-turn short circuit fault according to the phase angle of the negative sequence difference value.
In the present application, the target reactor is a shunt reactor.
The above-mentioned failure detection apparatus may further include a processor and a memory, and the above-mentioned detection unit 31, the acquisition unit 33, the calculation unit 35, the determination unit 37, and the like are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to implement corresponding functions.
The processor comprises a kernel, and the kernel calls a corresponding program unit from the memory. One or more than one core can be set, and the core parameters are adjusted to determine whether the target reactor has turn-to-turn short circuit fault.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium for storing a program, wherein the program, when executed by a processor, controls a device in which the storage medium is located to perform any one of the above-mentioned fault detection methods.
According to another aspect of the embodiments of the present invention, there is also provided a processor, configured to execute a program, where the program executes to perform any one of the above fault detection methods.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps: detecting the negative sequence current of a target reactor by using a current transformer, and detecting the negative sequence voltage of the target reactor by using a voltage transformer, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor; acquiring negative sequence current and negative sequence voltage; calculating a negative sequence difference between the negative sequence current and the negative sequence voltage; and determining whether the target reactor has turn-to-turn short circuit fault according to the negative sequence difference value.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of fault detection, comprising:
detecting a negative sequence current of a target reactor by using a current transformer, and detecting a negative sequence voltage of the target reactor by using a voltage transformer, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor;
acquiring the negative sequence current and the negative sequence voltage;
calculating a negative sequence difference between the negative sequence current and the negative sequence voltage;
and determining whether the target reactor has turn-to-turn short circuit fault or not according to the negative sequence difference value.
2. The method of claim 1, wherein calculating a negative sequence difference value between the negative sequence current and the negative sequence voltage comprises:
normalizing the negative sequence current and the negative sequence voltage to obtain normalized negative sequence current and normalized negative sequence voltage;
a negative sequence difference between the normalized negative sequence current and the normalized negative sequence voltage is calculated.
3. The method of claim 1, wherein determining whether a turn-to-turn short circuit fault occurs in a target reactor according to the negative sequence difference value comprises:
when the negative sequence difference value is a preset value, determining that the target reactor works normally and no turn-to-turn short circuit fault occurs;
and when the negative sequence difference value is not a preset value, determining that the target reactor has turn-to-turn short circuit fault.
4. The method of claim 3, wherein after determining that the target reactor has a turn-to-turn short fault, the method further comprises:
calculating a phase angle of the negative sequence difference value;
and determining the phase of the target reactor with the turn-to-turn short circuit fault according to the phase angle of the negative sequence difference value.
5. The method according to any one of claims 1 to 4, characterized in that the target reactor is a shunt reactor.
6. A fault detection device, comprising:
the detection unit is used for detecting the negative sequence current of a target reactor by using a current transformer and detecting the negative sequence voltage of the target reactor by using a voltage transformer, wherein the current transformer and the voltage transformer are arranged around a three-phase winding of the target reactor;
an acquisition unit configured to acquire the negative sequence current and the negative sequence voltage;
a calculation unit for calculating a negative sequence difference between the negative sequence current and the negative sequence voltage;
and the determining unit is used for determining whether the target reactor has turn-to-turn short circuit fault according to the negative sequence difference value.
7. The apparatus of claim 6, wherein the computing unit comprises:
the normalization module is used for performing normalization processing on the negative sequence current and the negative sequence voltage to obtain normalized negative sequence current and normalized negative sequence voltage;
a calculation module to calculate a negative sequence difference between the normalized negative sequence current and the normalized negative sequence voltage.
8. The apparatus of claim 6, wherein the determining unit comprises:
the first determining module is used for determining that the target reactor normally works and no turn-to-turn short circuit fault occurs when the negative sequence difference value is a preset value;
and the second determining module is used for determining that the target reactor has turn-to-turn short circuit fault when the negative sequence difference value is not a preset value.
9. A storage medium storing a program, wherein the program, when executed by a processor, controls an apparatus in which the storage medium is located to perform the fault detection method of any one of claims 1 to 5.
10. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the fault detection method according to any one of claims 1 to 5 when running.
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| CN111458658A (en) * | 2020-06-10 | 2020-07-28 | 国网山西省电力公司电力科学研究院 | Dry-type air-core reactor turn-to-turn short circuit fault screening device and screening method thereof |
| CN111981637A (en) * | 2020-09-01 | 2020-11-24 | 珠海格力电器股份有限公司 | Air conditioner short circuit abnormity detection method, computer device and computer readable storage medium |
| CN112557957A (en) * | 2019-09-09 | 2021-03-26 | 南京南瑞继保工程技术有限公司 | Method, device and system for judging PT (potential transformer) disconnection of magnetic control type controllable shunt reactor |
| CN115167372A (en) * | 2022-08-04 | 2022-10-11 | 潍柴动力股份有限公司 | Fault determination method, fault determination device, processor and electronic control unit |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652424A (en) * | 2005-01-13 | 2005-08-10 | 天津大学 | Protecting method for short-circuit between wire coils of parallel reactor of ultrahigh voltage transmission line |
| CN101025434A (en) * | 2007-03-28 | 2007-08-29 | 华北电力大学 | Asynchronous motor stator winding inter-turn short circuit failure on-line detecting method and device |
| CN101207272A (en) * | 2007-11-16 | 2008-06-25 | 国电南京自动化股份有限公司 | Turn space protection for reactor sequence component direction |
| CN101614779A (en) * | 2008-12-30 | 2009-12-30 | 许继集团有限公司 | Differentiate the method for shunt reactor turn-to-turn short circuit, line to line fault and single-phase short circuit |
| CN101881802A (en) * | 2010-07-06 | 2010-11-10 | 西安交通大学 | Dry type hollow reactor interturn short circuit fault on-line real-time detection method |
| WO2015195064A1 (en) * | 2014-06-20 | 2015-12-23 | Леонид Нисонович КОНТОРОВИЧ | Controllable electric reactor with transverse magnetization |
| CN105917539A (en) * | 2013-11-13 | 2016-08-31 | 西门子公司 | Method and apparatus of reactor turn-to-turn protection |
| US20170008404A1 (en) * | 2015-07-10 | 2017-01-12 | Toyota Jidosha Kabushiki Kaisha | Power supply system |
| CN106505520A (en) * | 2016-12-01 | 2017-03-15 | 特变电工南京智能电气有限公司 | One kind is taken out can reactor inter-turn protection method and device |
| CN108279359A (en) * | 2018-02-05 | 2018-07-13 | 国网山西省电力公司电力科学研究院 | Dry-type reactor interturn insulation method for diagnosing faults based on frequency response analysis |
| CN108603908A (en) * | 2016-02-10 | 2018-09-28 | 通用电气公司 | System and method for detecting the turn-to-turn fault in transformer winding |
| CN108700629A (en) * | 2016-02-10 | 2018-10-23 | 通用电气公司 | System and method for the turn-to-turn fault in detection winding |
-
2018
- 2018-12-20 CN CN201811565957.5A patent/CN109738739A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652424A (en) * | 2005-01-13 | 2005-08-10 | 天津大学 | Protecting method for short-circuit between wire coils of parallel reactor of ultrahigh voltage transmission line |
| CN101025434A (en) * | 2007-03-28 | 2007-08-29 | 华北电力大学 | Asynchronous motor stator winding inter-turn short circuit failure on-line detecting method and device |
| CN101207272A (en) * | 2007-11-16 | 2008-06-25 | 国电南京自动化股份有限公司 | Turn space protection for reactor sequence component direction |
| CN101614779A (en) * | 2008-12-30 | 2009-12-30 | 许继集团有限公司 | Differentiate the method for shunt reactor turn-to-turn short circuit, line to line fault and single-phase short circuit |
| CN101881802A (en) * | 2010-07-06 | 2010-11-10 | 西安交通大学 | Dry type hollow reactor interturn short circuit fault on-line real-time detection method |
| CN105917539A (en) * | 2013-11-13 | 2016-08-31 | 西门子公司 | Method and apparatus of reactor turn-to-turn protection |
| WO2015195064A1 (en) * | 2014-06-20 | 2015-12-23 | Леонид Нисонович КОНТОРОВИЧ | Controllable electric reactor with transverse magnetization |
| US20170008404A1 (en) * | 2015-07-10 | 2017-01-12 | Toyota Jidosha Kabushiki Kaisha | Power supply system |
| CN108603908A (en) * | 2016-02-10 | 2018-09-28 | 通用电气公司 | System and method for detecting the turn-to-turn fault in transformer winding |
| CN108700629A (en) * | 2016-02-10 | 2018-10-23 | 通用电气公司 | System and method for the turn-to-turn fault in detection winding |
| CN106505520A (en) * | 2016-12-01 | 2017-03-15 | 特变电工南京智能电气有限公司 | One kind is taken out can reactor inter-turn protection method and device |
| CN108279359A (en) * | 2018-02-05 | 2018-07-13 | 国网山西省电力公司电力科学研究院 | Dry-type reactor interturn insulation method for diagnosing faults based on frequency response analysis |
Non-Patent Citations (4)
| Title |
|---|
| RABIA KHAN等: "Comparison of fault current limitation with saturable reactor and dynamic voltage restorer", 《2017 IEEE POWER & ENERGY SOCIETY GENERAL MEETING》 * |
| 尹刚等: "500kv抽能并联电抗器的匝间短路保护", 《电网技术》 * |
| 张琦雪等: "静态阻塞滤波器的电抗器匝间故障及其保护的分析", 《电力自动化设备》 * |
| 李斌等: "超高压输电线并联电抗器的匝间短路保护", 《天津大学学报》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148340A (en) * | 2019-06-11 | 2019-08-20 | 云南电网有限责任公司电力科学研究院 | A kind of true pattern draft experiment phase fault protective device of singlephase earth fault and method |
| CN110148340B (en) * | 2019-06-11 | 2021-06-11 | 云南电网有限责任公司电力科学研究院 | Single-phase earth fault true mode simulation experiment interphase short circuit protection device and method |
| CN112557957A (en) * | 2019-09-09 | 2021-03-26 | 南京南瑞继保工程技术有限公司 | Method, device and system for judging PT (potential transformer) disconnection of magnetic control type controllable shunt reactor |
| CN111239646A (en) * | 2020-01-17 | 2020-06-05 | 南方电网科学研究院有限责任公司 | On-load tap-changer interstage short circuit fault early warning method and device and storage medium |
| CN111239646B (en) * | 2020-01-17 | 2021-10-01 | 南方电网科学研究院有限责任公司 | On-load tap-changer interstage short circuit fault early warning method and device and storage medium |
| CN111458658A (en) * | 2020-06-10 | 2020-07-28 | 国网山西省电力公司电力科学研究院 | Dry-type air-core reactor turn-to-turn short circuit fault screening device and screening method thereof |
| CN111981637A (en) * | 2020-09-01 | 2020-11-24 | 珠海格力电器股份有限公司 | Air conditioner short circuit abnormity detection method, computer device and computer readable storage medium |
| CN111981637B (en) * | 2020-09-01 | 2021-11-19 | 珠海格力电器股份有限公司 | Air conditioner short circuit abnormity detection method, computer device and computer readable storage medium |
| CN115167372A (en) * | 2022-08-04 | 2022-10-11 | 潍柴动力股份有限公司 | Fault determination method, fault determination device, processor and electronic control unit |
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