CN113852046B - Method and system for preventing turn-to-turn protection misoperation when line reactor adopts bus PT - Google Patents
Method and system for preventing turn-to-turn protection misoperation when line reactor adopts bus PT Download PDFInfo
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- CN113852046B CN113852046B CN202111150207.3A CN202111150207A CN113852046B CN 113852046 B CN113852046 B CN 113852046B CN 202111150207 A CN202111150207 A CN 202111150207A CN 113852046 B CN113852046 B CN 113852046B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000010355 oscillation Effects 0.000 claims abstract description 66
- 238000005070 sampling Methods 0.000 claims abstract description 51
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 230000007257 malfunction Effects 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Abstract
The invention provides a method and a system for preventing turn-to-turn protection misoperation when a line reactor adopts a bus PT. Acquiring a three-phase current sampling point value at the head end of a line reactor in the process of RLC oscillation between a line capacitor and the line reactor after a line empty charging switch is disconnected; according to the three-phase current sampling point values, solving gradient values of adjacent sampling points of each phase of current; according to the gradient values of adjacent sampling points of each phase of current, respectively calculating three-phase oscillation current frequency values based on a preset gradient threshold value; according to the frequency value of the three-phase oscillation current, solving the absolute value of the frequency difference of any two-phase oscillation current; and judging whether the turn-to-turn fault occurs in the line reactor according to whether the absolute value of the frequency difference of any two-phase oscillation current meets a preset threshold value condition. The invention can effectively improve the sensitivity and reliability of the inter-turn protection of the reactor, can effectively prevent the occurrence of the inter-turn protection misoperation when the line reactor adopts the bus PT, and can reliably and comprehensively protect the reactor.
Description
Technical Field
The invention relates to a method and a system for preventing turn-to-turn protection misoperation when a line reactor adopts a bus PT, and belongs to the field of reactor protection.
Background
The high-voltage shunt reactor is used as important equipment for limiting overvoltage and reactive compensation in a high-voltage power system, and plays an important role in safe and stable operation of a power grid. In order to reliably protect the high-voltage shunt reactor, the shunt reactor in the current power system is provided with perfect main protection and backup protection, wherein the main protection comprises current differential protection for reflecting grounding and inter-phase faults and inter-turn protection for reflecting inter-turn faults of the reactor. The inter-turn protection consists of zero-sequence impedance and zero-sequence power direction, and can sensitively reflect the inter-turn fault of the reactor, but in actual engineering, in order to save investment, three-phase PT (voltage transformer) is not generally configured on a transmission line in offshore wind power engineering to save space, so that a three-phase voltage loop of a line reactor protection device in the engineering adopts a bus three-phase PT to collect analog quantity, the line reactor protection device adopts the bus three-phase voltage analog quantity to calculate zero-sequence voltage, zero-sequence current and zero-sequence power direction related to the inter-turn protection, and the inter-turn fault is judged according to logic.
When the bus PT is adopted for the turn-to-turn protection of the line reactor, the protection can be operated reliably under normal conditions, but after the line air charge switch is tripped, the line reactor is disconnected with the bus, the three-phase voltage of the bus cannot reflect the voltage condition of the head end of the line reactor, no zero-sequence voltage exists because the three-phase voltage is symmetrical when the bus voltage is normal, the reactor and the line capacitor oscillate after the line switch is disconnected, the head end of the reactor has zero-sequence current because of the difference of three-phase parameters, the zero-sequence impedance calculated by the protection device is close to zero at the moment, the zero-sequence power direction is random, the turn-to-turn protection action condition can be met, the turn-to-turn protection misoperation is caused, the operation and maintenance work difficulty is increased, the line operation is influenced, the power supply recovery time is delayed, and no method for preventing the turn-to-turn protection misoperation when the bus PT is adopted by the line reactor in the current engineering, so that the situation becomes a stubborn condition in a power system.
Disclosure of Invention
The invention aims to provide a method and a system for preventing turn-to-turn protection misoperation when a bus PT is adopted by a line reactor, so as to solve the problem that turn-to-turn protection misoperation can occur after a line empty charging switch is tripped when the bus PT is adopted by the line reactor.
In order to achieve the above purpose, the invention adopts the following technical scheme:
on the one hand, the method for preventing the turn-to-turn protection misoperation when the line reactor adopts the bus PT comprises the following steps:
acquiring a three-phase current sampling point value at the head end of a line reactor in the process of RLC oscillation between a line capacitor and the line reactor after a line empty charging switch is disconnected;
according to the three-phase current sampling point values, solving gradient values of adjacent sampling points of each phase of current;
according to the gradient values of adjacent sampling points of each phase of current, respectively calculating three-phase oscillation current frequency values based on a preset gradient threshold value;
according to the frequency value of the three-phase oscillation current, solving the absolute value of the frequency difference of any two-phase oscillation current;
and judging whether the turn-to-turn fault occurs in the line reactor according to whether the absolute value of the frequency difference of any two-phase oscillation current meets a preset threshold value condition.
Further, the obtaining the three-phase current sampling point value at the head end of the line reactor after the line empty charging switch is disconnected includes:
continuously measuring three-phase current at the head end of the line reactor in the process of RLC oscillation between the line capacitor and the line reactor after the line empty charging switch is disconnected, and obtaining a three-phase current sampling value;
and discretizing the three-phase current sampling value obtained by measurement to obtain a discrete three-phase current sampling point value.
Further, the gradient values of the adjacent sampling points of each phase of current are calculated according to the following formula:
wherein: d, d t1 At t 1 A gradient value of time; i.e t0 At t 0 Current sample value of time, i t1 At t 1 The current sample at the moment.
Further, the calculating the frequency value of the three-phase oscillation current based on the preset gradient threshold value according to the gradient values of the adjacent sampling points of each phase of current respectively includes:
according to the fact that the gradient value of each phase of current adjacent sampling points is smaller than the gradient threshold value, two adjacent gradient values smaller than the gradient threshold value and the time corresponding to the gradient values are obtained;
solving a time difference value according to the time corresponding to the two adjacent gradient values;
and calculating the frequency value of each phase of oscillating current according to the time difference value.
Further, the oscillating current frequency value per phase is calculated according to the following formula:
wherein: d, d tm At t m A gradient value of time; d, d tn At t n Gradient value of time, t m >t n In seconds, f is the oscillating current frequency, and k is the gradient threshold.
Further, the absolute value of the frequency difference of the oscillating currents of any two phases is calculated according to the following formula:
wherein: f (f) A The frequency value of the phase A oscillating current is; f (f) B The frequency value of the B phase oscillation current is; f (f) C The frequency value of the C-phase oscillating current is; h is a A The absolute value of the frequency difference value of the AB phase oscillation current; h is a B The absolute value of the frequency difference value of the BC phase oscillation current; h is a C The absolute value of the difference between the frequencies of the CA phase oscillation currents.
Further, the judging whether the turn-to-turn fault occurs in the line reactor according to whether the absolute value of the frequency difference of any two-phase oscillation current meets a preset threshold value condition or not includes:
if the absolute value of any two frequency differences in the absolute values of any two-phase oscillation current frequency differences is larger than a preset threshold value, judging that the turn-to-turn fault occurs in the line reactor.
On the other hand, a system for preventing turn-to-turn protection malfunction when a line reactor adopts a bus PT, comprising:
the acquisition module is configured to acquire a three-phase current sampling point value at the head end of the line reactor in the process that the line capacitor and the line reactor generate RLC oscillation after the line air charge switch is disconnected;
the first calculation module is configured to solve gradient values of adjacent sampling points of each phase of current according to the three-phase current sampling point values;
the second calculation module is configured to calculate three-phase oscillation current frequency values respectively based on a preset gradient threshold value according to the gradient values of adjacent sampling points of each phase of current;
the third calculation module is configured to solve the absolute value of the frequency difference of any two-phase oscillating current according to the frequency value of the three-phase oscillating current;
the judging module is configured to judge whether the turn-to-turn fault occurs in the line reactor according to whether the absolute value of the frequency difference of any two-phase oscillation current meets a preset threshold value condition.
In another aspect, a computer readable storage medium has stored thereon a computer program which, when executed in a computer, causes the computer to perform a method of preventing turn-to-turn protection malfunction when a line reactor employs a busbar PT as described above.
In another aspect, a computing device includes a memory and a processor, where the memory stores executable code, and the processor implements the aforementioned method for preventing turn-to-turn protection malfunction when a line reactor employs a bus PT when executing the executable code.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the method, after the line air charge switch is disconnected, when the line capacitor and the reactor are subjected to RLC oscillation, the oscillation frequency of the three-phase oscillation current is relatively close when the normal reactor is free from faults, and when the reactor is subjected to inter-turn faults, a larger short circuit resistance exists, the energy is rapidly discharged, the oscillation phenomenon is rapidly disappeared, the oscillation frequency is obviously different from other phases, and whether the reactor is failed or not is judged by utilizing the frequency difference of the three-phase oscillation current at the head end of the reactor.
Drawings
Fig. 1 is a flowchart of a method for preventing turn-to-turn protection malfunction when a line reactor adopts a bus PT according to an embodiment of the present invention;
fig. 2 is a logic diagram for judging a reactor failure.
Detailed Description
The invention is further described below in connection with specific embodiments. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
As described above, when the bus PT is used for the inter-turn protection of the line reactor, an inter-turn protection malfunction occurs after the line air charge switch is tripped.
Therefore, the invention provides a method for preventing turn-to-turn protection misoperation when a line reactor adopts a bus PT, when a line empty charge switch is disconnected, the oscillation frequency of three-phase oscillation current is relatively close to that of a normal reactor when no fault occurs to the reactor, a large short circuit resistor exists when the turn-to-turn fault occurs to the reactor, the energy is rapidly discharged, the oscillation phenomenon rapidly disappears, the oscillation frequency has obvious difference with other phases, and whether the turn-to-turn fault occurs to the reactor is judged by utilizing the frequency difference of the three-phase oscillation current at the head end of the reactor.
In one embodiment, as shown in fig. 1, a method for preventing turn-to-turn protection malfunction when a line reactor adopts a bus PT includes:
step S11, acquiring a three-phase current sampling point value at the head end of a line reactor in the process of RLC oscillation between a line capacitor and the line reactor after a line empty charging switch is disconnected;
in an embodiment, obtaining a three-phase current sampling point value at a head end of a line reactor after a line air charge switch is turned off includes:
continuously measuring three-phase current at the head end of the line reactor in the process of RLC oscillation between the line capacitor and the line reactor after the line empty charging switch is disconnected, and obtaining a three-phase current sampling value;
and discretizing the three-phase current sampling value obtained by measurement to obtain a discrete three-phase current sampling point value.
Step S12, according to the three-phase current sampling point values, solving the gradient values of adjacent sampling points of each phase of current;
the gradient values of adjacent sampling points of each phase of current can be calculated according to the following formula (1):
wherein: d, d t1 At t 1 A gradient value of time; i.e t0 At t 0 Current sample value of time, i t1 At t 1 The current sample at the moment.
Step S13, respectively calculating three-phase oscillation current frequency values based on a preset gradient threshold value according to gradient values of adjacent sampling points of each phase of current;
this step may include:
according to the fact that the gradient value of each phase of current adjacent sampling points is smaller than the gradient threshold value, two adjacent gradient values smaller than the gradient threshold value and the time corresponding to the gradient values are obtained;
solving a time difference value according to the time corresponding to the two adjacent gradient values;
and calculating the frequency value of each phase of oscillating current according to the time difference value.
In a specific embodiment, according to the gradient value solved by each phase of current sampling point, setting a gradient threshold value, recording two adjacent gradient values smaller than the threshold value and the time corresponding to the gradient value, and then solving a time difference value according to the time corresponding to the two adjacent gradient values, namely, obtaining the time corresponding to the adjacent wave crest and wave trough of the corresponding current waveform by setting the gradient threshold value, wherein the calculated time difference is half period of the current waveform, so that the current oscillation frequency value can be calculated according to the time difference value, and a calculation formula is shown as formula (2):
wherein: d, d tm At t m A gradient value of time; d, d tn At t n Gradient value of time, t m >t n In seconds, f is the oscillating current frequency, and k is the gradient threshold.
Step S14, according to the frequency value of the three-phase oscillation current, solving the absolute value of the frequency difference of any two-phase oscillation current;
the absolute value of the frequency difference of any two-phase oscillation current can be calculated according to the following formula:
wherein: f (f) A Calculating a frequency value for the phase a current; f (f) B Calculating a frequency value for the B-phase current; f (f) C Calculating a frequency value for the C-phase current; h is a A The absolute value of the AB phase current frequency difference value; h is a B The absolute value of the BC phase current frequency difference value; h is a C Is the absolute value of the CA phase current frequency difference.
And S15, judging whether the turn-to-turn fault occurs in the line reactor according to whether the absolute value of the frequency difference of any two-phase oscillation current meets a preset threshold value condition.
And setting a frequency difference threshold L according to the calculated absolute value of the frequency difference of any two phases of oscillating currents, judging that the reactor has inter-turn faults when the absolute value of any two phases of oscillating currents is larger than the threshold L, otherwise, judging that the reactor has no inter-turn faults, and judging logic is shown in figure 2.
The criterion has higher reliability, can avoid the problem of frequency calculation error caused by oscillation current waveform deviation, and has higher practicability.
According to the method for preventing the turn-to-turn protection misoperation when the line reactor adopts the bus PT, when the line air charge switch is disconnected and the RLC oscillation occurs between the line capacitor and the reactor, the oscillation frequency of the three-phase oscillation current is relatively close when the normal reactor has no fault, the reactor has a larger short-circuit resistor when the turn-to-turn fault occurs, the energy is rapidly discharged, the oscillation phenomenon rapidly disappears, the oscillation frequency has obvious difference with other phases, and the three-phase oscillation current frequency difference at the head end of the reactor is utilized to judge whether the reactor has faults or not.
In another embodiment, a system for preventing turn-to-turn protection malfunction when a line reactor employs a bus PT, includes:
the acquisition module is configured to acquire a three-phase current sampling point value at the head end of the line reactor in the process that the line capacitor and the line reactor generate RLC oscillation after the line air charge switch is disconnected;
the first calculation module is configured to solve gradient values of adjacent sampling points of each phase of current according to the three-phase current sampling point values;
the second calculation module is configured to calculate three-phase oscillation current frequency values respectively based on a preset gradient threshold value according to the gradient values of adjacent sampling points of each phase of current;
the third calculation module is configured to solve the absolute value of the frequency difference of any two-phase oscillating current according to the frequency value of the three-phase oscillating current;
the judging module is configured to judge whether the turn-to-turn fault occurs in the line reactor according to whether the absolute value of the frequency difference of any two-phase oscillation current meets a preset threshold value condition.
In another embodiment, a computer readable storage medium has a computer program stored thereon, which when executed in a computer causes the computer to perform a method of preventing turn-to-turn protection malfunction when a line reactor employs a busbar PT as described above.
In another embodiment, a computing device includes a memory and a processor, where the memory stores executable code, and the processor implements the aforementioned method for preventing turn-to-turn protection malfunction when a line reactor employs a bus PT when executing the executable code.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (8)
1. The method for preventing turn-to-turn protection misoperation when the line reactor adopts the bus PT is characterized by comprising the following steps:
acquiring a three-phase current sampling point value at the head end of a line reactor in the process of RLC oscillation between a line capacitor and the line reactor after a line empty charging switch is disconnected;
according to the three-phase current sampling point values, solving gradient values of adjacent sampling points of each phase of current;
according to the gradient values of adjacent sampling points of each phase of current, respectively calculating three-phase oscillation current frequency values based on a preset gradient threshold value;
according to the frequency value of the three-phase oscillation current, solving the absolute value of the frequency difference of any two-phase oscillation current;
judging whether the turn-to-turn fault occurs in the line reactor according to whether the absolute value of the frequency difference of any two-phase oscillation current meets a preset threshold value condition;
the step of respectively calculating the frequency values of the three-phase oscillation currents based on the preset gradient threshold value according to the gradient values of the adjacent sampling points of each phase of current comprises the following steps:
according to the fact that the gradient value of each phase of current adjacent sampling points is smaller than the gradient threshold value, two adjacent gradient values smaller than the gradient threshold value and the time corresponding to the gradient values are obtained;
solving a time difference value according to the time corresponding to the two adjacent gradient values;
calculating the frequency value of each phase of oscillating current according to the time difference value;
wherein the oscillating current frequency value per phase is calculated according to the following formula:
wherein: d, d tm At t m A gradient value of time; d, d tn At t n Gradient value of time, t m >t n In seconds, f is the oscillating current frequency, and k is the gradient threshold.
2. The method for preventing turn-to-turn protection malfunction when the line reactor adopts the bus PT as set forth in claim 1, wherein the obtaining the three-phase current sampling point value at the head end of the line reactor after the line air charge switch is turned off includes:
continuously measuring three-phase current at the head end of the line reactor in the process of RLC oscillation between the line capacitor and the line reactor after the line empty charging switch is disconnected, and obtaining a three-phase current sampling value;
and discretizing the three-phase current sampling value obtained by measurement to obtain a discrete three-phase current sampling point value.
3. The method for preventing turn-to-turn protection malfunction when the line reactor adopts the bus PT according to claim 1, wherein the gradient values of the adjacent sampling points of each phase of current are calculated according to the following formula:
wherein: d, d t1 At t 1 A gradient value of time; i.e t0 At t 0 Current sample value of time, i t1 At t 1 The current sample at the moment.
4. The method for preventing turn-to-turn protection malfunction when a line reactor adopts a bus PT according to claim 1, wherein the absolute value of the frequency difference of the oscillating current of any two phases is calculated according to the following formula:
wherein: f (f) A The frequency value of the phase A oscillating current is; f (f) B For B-phase oscillating current frequency value；f C The frequency value of the C-phase oscillating current is; h is a A The absolute value of the frequency difference value of the AB phase oscillation current; h is a B The absolute value of the frequency difference value of the BC phase oscillation current; h is a C The absolute value of the difference between the frequencies of the CA phase oscillation currents.
5. The method for preventing turn-to-turn protection malfunction when the line reactor adopts the bus PT as set forth in claim 1, wherein the determining whether the line reactor has a turn-to-turn malfunction according to whether the absolute value of the frequency difference of any two-phase oscillation current satisfies a preset threshold condition includes:
if the absolute value of any two frequency differences in the absolute values of any two-phase oscillation current frequency differences is larger than a preset threshold value, judging that the turn-to-turn fault occurs in the line reactor.
6. A system for preventing turn-to-turn protection malfunction when a line reactor employs a bus PT, comprising:
the acquisition module is configured to acquire a three-phase current sampling point value at the head end of the line reactor in the process that the line capacitor and the line reactor generate RLC oscillation after the line air charge switch is disconnected;
the first calculation module is configured to solve gradient values of adjacent sampling points of each phase of current according to the three-phase current sampling point values;
the second calculation module is configured to calculate three-phase oscillation current frequency values respectively based on a preset gradient threshold value according to the gradient values of adjacent sampling points of each phase of current;
the third calculation module is configured to solve the absolute value of the frequency difference of any two-phase oscillating current according to the frequency value of the three-phase oscillating current;
the judging module is configured to judge whether the turn-to-turn fault occurs in the line reactor according to whether the absolute value of the frequency difference of any two-phase oscillation current meets a preset threshold value condition;
the step of respectively calculating the frequency values of the three-phase oscillation currents based on the preset gradient threshold value according to the gradient values of the adjacent sampling points of each phase of current comprises the following steps:
according to the fact that the gradient value of each phase of current adjacent sampling points is smaller than the gradient threshold value, two adjacent gradient values smaller than the gradient threshold value and the time corresponding to the gradient values are obtained;
solving a time difference value according to the time corresponding to the two adjacent gradient values;
calculating the frequency value of each phase of oscillating current according to the time difference value;
wherein the oscillating current frequency value per phase is calculated according to the following formula:
wherein: d, d tm At t m A gradient value of time; d, d tn At t n Gradient value of time, t m >t n In seconds, f is the oscillating current frequency, and k is the gradient threshold.
7. A computer readable storage medium having stored thereon a computer program which, when executed in a computer, causes the computer to perform the method of any of claims 1-5.
8. A computing device comprising a memory having executable code stored therein and a processor, which when executing the executable code, implements the method of any of claims 1-5.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882185A (en) * | 2011-07-14 | 2013-01-16 | 湖北省电力公司电力科学研究院 | Comprehensive relay protection method for single element zero sequence transverse differential current of large generator |
| CN103797372A (en) * | 2011-07-14 | 2014-05-14 | 艾安电子开关设备有限公司 | Method and device for measuring electric currents by means of a current transformer |
| CN108318791A (en) * | 2018-03-26 | 2018-07-24 | 长沙理工大学 | Air reactor turn-to-turn insulation insulation fault method of discrimination based on frequency domain character analysis |
| CN109038489A (en) * | 2018-07-19 | 2018-12-18 | 许继集团有限公司 | A kind of high-voltage shunt reactor turn-to-turn fault guard method |
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- 2021-09-29 CN CN202111150207.3A patent/CN113852046B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882185A (en) * | 2011-07-14 | 2013-01-16 | 湖北省电力公司电力科学研究院 | Comprehensive relay protection method for single element zero sequence transverse differential current of large generator |
| CN103797372A (en) * | 2011-07-14 | 2014-05-14 | 艾安电子开关设备有限公司 | Method and device for measuring electric currents by means of a current transformer |
| CN108318791A (en) * | 2018-03-26 | 2018-07-24 | 长沙理工大学 | Air reactor turn-to-turn insulation insulation fault method of discrimination based on frequency domain character analysis |
| CN109038489A (en) * | 2018-07-19 | 2018-12-18 | 许继集团有限公司 | A kind of high-voltage shunt reactor turn-to-turn fault guard method |
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