CN113746071A - PT ferromagnetic resonance grounding line selection anti-misoperation protection method and device - Google Patents
PT ferromagnetic resonance grounding line selection anti-misoperation protection method and device Download PDFInfo
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- CN113746071A CN113746071A CN202110973060.1A CN202110973060A CN113746071A CN 113746071 A CN113746071 A CN 113746071A CN 202110973060 A CN202110973060 A CN 202110973060A CN 113746071 A CN113746071 A CN 113746071A
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/14—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to occurrence of voltage on parts normally at earth potential
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/50—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the appearance of abnormal wave forms, e.g. AC in DC installations
- H02H3/52—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the appearance of abnormal wave forms, e.g. AC in DC installations responsive to the appearance of harmonics
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Abstract
本发明公开了一种PT铁磁谐振接地选线防误动保护方法及装置，其中方法包括：获取零序电压总有效值；获取零序电压基波值；判断零序电压总有效值与零序电压基波值的比例值是否大于第一预设数值；如零序电压总有效值与零序电压基波值的比例值大于第一预设数值，则判定发生PT铁磁谐振，并闭锁接地选线保护；如零序电压总有效值与零序电压基波值的比例值小于或等于第一预设数值，则判定未发生PT铁磁谐振，并开放接地选线保护。通过比较零序电压总有效值与零序电压基波比值是否大于预设值来判断是否发生铁磁谐振，当发生铁磁谐振时能可靠闭锁接地选线保护，若未发生则快速开放接地选线保护，提高了设备的安全性。
The invention discloses a PT ferromagnetic resonance grounding line selection anti-misoperation protection method and device, wherein the method includes: obtaining the total effective value of the zero-sequence voltage; obtaining the fundamental value of the zero-sequence voltage; Whether the proportional value of the fundamental value of the sequence voltage is greater than the first preset value; if the proportional value of the total effective value of the zero-sequence voltage and the fundamental value of the zero-sequence voltage is greater than the first preset value, it is determined that PT ferromagnetic resonance occurs and the block is blocked. Grounding line selection protection; if the ratio of the total effective value of the zero-sequence voltage to the fundamental value of the zero-sequence voltage is less than or equal to the first preset value, it is determined that PT ferromagnetic resonance does not occur, and the grounding line selection protection is opened. Determine whether ferromagnetic resonance occurs by comparing whether the ratio of the total effective value of the zero-sequence voltage to the fundamental wave of the zero-sequence voltage is greater than the preset value. When ferromagnetic resonance occurs, the grounding line selection protection can be reliably blocked. Line protection improves the security of the device.
Description
Technical Field
The invention relates to the technical field of power equipment control, in particular to a PT ferromagnetic resonance grounding line selection anti-misoperation protection method and device.
Background
Electromagnetic voltage transformers are often used in power systems with voltage levels of 35kV and below. An electromagnetic voltage transformer. The circuit comprises an inductance to ground and a capacitance to ground of a bus, and forms an oscillating loop. When the power grid is subjected to impact disturbance, the voltage to earth of one phase or two phases can be increased instantly, so that the exciting current of the transformer is increased suddenly and saturated, the inductance can be reduced rapidly, and the PT ferromagnetic resonance can be generated.
Protection against malfunction is a fundamental requirement of the protection device when PT ferroresonance occurs. When PT ferromagnetic resonance occurs, a waveform of a secondary side is distorted, so that a voltage effective value is increased, and when the voltage effective value exceeds a voltage threshold of a grounding line selection circuit, the grounding line selection protection is mistakenly operated. Therefore, it is necessary to solve the problem of false operation of grounding line selection protection caused by PT ferromagnetic resonance.
Disclosure of Invention
The embodiment of the invention aims to provide a PT ferromagnetic resonance grounding line selection anti-misoperation protection method and a PT ferromagnetic resonance grounding line selection anti-misoperation protection device.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a PT ferroresonant grounded line selection anti-malfunction protection method, including:
acquiring a total zero sequence voltage effective value;
acquiring a zero sequence voltage fundamental wave value;
judging whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is larger than a first preset value or not;
if the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is greater than the first preset value, judging that PT ferromagnetic resonance occurs, and locking grounding line selection protection;
and if the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is less than or equal to the first preset value, judging that the PT ferromagnetic resonance does not occur, and opening the grounding line selection protection.
Further, the total effective value of zero sequence voltage includes: all subharmonic, ultraharmonic and fundamental components.
Further, the first preset ratio value has a value ranging from 1.1 to 1.4.
Further, the first preset proportion value is 1.2.
Further, after determining that PT ferroresonance occurs and locking the ground line selection protection, the method further includes:
and instantaneously locking all the grounding line selection protection, and sending PT ferromagnetic resonance alarm signals in a delayed mode.
Accordingly, a second aspect of an embodiment of the present invention provides a PT ferroresonant grounded line selection anti-malfunction protection device, including:
the first acquisition module is used for acquiring a total zero sequence voltage effective value;
the second acquisition module is used for acquiring a zero sequence voltage fundamental wave value;
the judging module is used for judging whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is larger than a first preset value or not;
the first control module is used for judging that PT ferromagnetic resonance occurs and locking grounding line selection protection when the proportion value of the zero sequence voltage total effective value and the zero sequence voltage fundamental wave value is larger than a first preset value;
and the first control module is further used for judging that the PT ferromagnetic resonance does not occur and opening grounding line selection protection when the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is less than or equal to the first preset value.
Further, the total effective value of zero sequence voltage includes: all subharmonic, ultraharmonic and fundamental components.
Further, the first preset ratio value has a value ranging from 1.1 to 1.4.
Further, the first preset proportion value is 1.2.
Further, the PT ferroresonant grounded route selection anti-malfunction protection device further includes:
and the second control module is used for instantaneously locking all the grounding line selection protection after judging that the PT ferromagnetic resonance occurs and locking the grounding line selection protection, and sending a PT ferromagnetic resonance alarm signal in a delayed mode.
Accordingly, a third aspect of the embodiments of the present invention further provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by a processor, and the instructions are executed by the processor to enable at least one processor to execute the PT ferroresonant grounding line selection anti-misoperation protection method.
In addition, a fourth aspect of the embodiments of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions, when executed by a processor, implement the PT ferroresonant grounded line selection anti-false operation protection method described above.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
whether ferromagnetic resonance occurs or not is judged by comparing whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave is larger than a preset value or not, grounding line selection protection can be reliably locked when ferromagnetic resonance occurs, and can be quickly opened when ferromagnetic resonance does not occur, so that grounding line selection protection misoperation caused by PT ferromagnetic resonance is prevented when impact disturbance occurs to a power grid, and the safety of equipment is improved.
Drawings
Fig. 1 is a flowchart of a PT ferroresonant grounded line selection anti-malfunction protection method provided in an embodiment of the present invention;
fig. 2 is a logic diagram of the PT ferroresonant grounded line selection anti-malfunction protection method provided by the embodiment of the present invention;
fig. 3 is a block diagram of a PT ferroresonant grounded line selection anti-malfunction protection device provided in an embodiment of the present invention.
Reference numerals:
1. the device comprises a first acquisition module 2, a second acquisition module 3, a judgment module 4, a first control module 5 and a second control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a flowchart of a PT ferroresonant grounded line selection anti-malfunction protection method according to an embodiment of the present invention.
Fig. 2 is a logic diagram of the PT ferroresonant grounded line selection anti-malfunction protection method according to an embodiment of the present invention.
Referring to fig. 1 and 2, a first aspect of an embodiment of the present invention provides a PT ferroresonant grounded line selection anti-malfunction protection method, including:
and S100, acquiring a total zero sequence voltage effective value.
And S200, acquiring a zero sequence voltage fundamental wave value.
S300, judging whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is larger than a first preset value.
S400, if the proportion value of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is larger than a first preset value, judging that PT ferromagnetic resonance occurs, and locking grounding line selection protection.
S500, if the proportion value of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is smaller than or equal to a first preset value, judging that PT ferromagnetic resonance does not occur, and opening grounding line selection protection.
The PT ferromagnetic resonance grounding line selection anti-misoperation protection method obtains a zero-sequence voltage total effective value Uz and a zero-sequence voltage fundamental wave value Uj, and judges whether PT ferromagnetic resonance occurs or not by judging whether the ratio of the zero-sequence voltage total effective value to the zero-sequence voltage fundamental wave is greater than a threshold value K or not; if PT ferromagnetic resonance occurs, the grounding line selection protection is locked, and if PT ferromagnetic resonance does not occur, the grounding line selection protection is opened.
Further, the total effective value of the zero sequence voltage includes: all subharmonic, ultraharmonic and fundamental components.
The ferromagnetic resonance can be subharmonic resonance or higher harmonic resonance, so that the amplitude information of the zero sequence voltage total effective value Uz and the zero sequence voltage fundamental wave value Uj is measured simultaneously in the embodiment of the invention, and whether the ferromagnetic resonance occurs or not is judged according to the amplitude information; if PT ferromagnetic resonance occurs, the grounding line selection protection is locked, otherwise, the grounding line selection protection is opened, so that the grounding line selection protection misoperation caused by voltage abnormity due to PT ferromagnetic resonance can be prevented. The zero sequence voltage total effective value Uz comprises all subharmonics, higher harmonics and fundamental waves, so that the subharmonics resonance or the higher harmonics resonance can be judged by adopting the zero sequence voltage total effective value Uz; and when the zero-sequence voltage is in normal operation, the total effective value of the zero-sequence voltage is basically equal to the fundamental value of the zero-sequence voltage.
Optionally, the first predetermined ratio value K has a value in the range of 1.1-1.4, i.e.
When the PT is in the normal state, the PT is judged to be in ferromagnetic resonance.
According to the requirement of harmonic waves in a power grid in the power quality public power grid harmonic waves GB/T14549-1993, the voltage total harmonic wave time change rate of a nominal voltage 10KV public power grid is not more than 4%. A small amount of harmonic waves are allowed to exist in the normal operation of the power grid, the first preset proportion value 1.1 is the lowest threshold value which is not judged to be PT ferromagnetic resonance by mistake in the normal operation process of the power grid, the first preset proportion value 1.4 is the highest threshold value which is not judged to be PT ferromagnetic resonance by mistake in the industrial and mining enterprises which generate higher harmonic waves in the operation process, and the numerical range of the first preset proportion value K is selected to be 1.1-1.4 on the basis of comprehensively considering the harmonic wave content of the normal operation of the power grid and the special operation scene of the industrial and mining enterprises.
Preferably, the first preset ratio value is 1.2.
When the first preset proportion value is 1.1, the threshold value is smaller, and certain misjudgment probability is easy to occur when harmonic interference is generated in the operation process; the first preset proportion value is 1.3 or the threshold value of 1.4 is relatively large, so that the method is generally suitable for industrial and mining enterprises with high harmonic content in normal operation, the high harmonic content generated in the operation process is prevented from being wrongly judged as PT ferromagnetic resonance, and the first preset proportion value is comprehensively considered to be 1.2 under the condition of ensuring that the misjudgment does not occur.
Further, after determining that PT ferroresonance occurs and locking the ground line selection protection, the method further includes:
and instantaneously locking all the grounding line selection protection, and sending PT ferromagnetic resonance alarm signals in a delayed mode.
Accordingly, a second aspect of an embodiment of the present invention provides a PT ferroresonant grounded line selection anti-malfunction protection device, including: the device comprises a first acquisition module 1, a second acquisition module 2, a judgment module 3 and a first control module 4. The first obtaining module 1 is used for obtaining a total zero sequence voltage effective value; the second obtaining module 2 is used for obtaining a zero sequence voltage fundamental wave value; the judging module 3 is used for judging whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is larger than a first preset value; the first control module 4 is configured to determine that PT ferromagnetic resonance occurs when a ratio of the zero-sequence voltage total effective value to the zero-sequence voltage fundamental wave value is greater than a first preset value, and lock the ground line selection protection.
The PT ferromagnetic resonance grounding line selection anti-misoperation protection device acquires a zero-sequence voltage total effective value Uz and a zero-sequence voltage fundamental wave value Uj, and judges whether PT ferromagnetic resonance occurs or not by judging whether the ratio of the zero-sequence voltage total effective value to the zero-sequence voltage fundamental wave is greater than a threshold value K or not; if PT ferromagnetic resonance occurs, the grounding line selection protection is locked, and if PT ferromagnetic resonance does not occur, the grounding line selection protection is opened.
And the first control module is also used for judging that PT ferromagnetic resonance does not occur and opening grounding line selection protection when the proportion value of the total effective value of the zero sequence voltage and the fundamental wave value of the zero sequence voltage is less than or equal to a first preset value.
Further, the total effective value of the zero sequence voltage includes: all subharmonic, ultraharmonic and fundamental components.
The ferromagnetic resonance can be subharmonic resonance or higher harmonic resonance, so that the amplitude information of the zero sequence voltage total effective value Uz and the zero sequence voltage fundamental wave value Uj is measured simultaneously in the embodiment of the invention, and whether the ferromagnetic resonance occurs or not is judged according to the amplitude information; if PT ferromagnetic resonance occurs, the grounding line selection protection is locked, otherwise, the grounding line selection protection is opened, so that the grounding line selection protection misoperation caused by voltage abnormity due to PT ferromagnetic resonance can be prevented. The zero sequence voltage total effective value Uz comprises all subharmonics, higher harmonics and fundamental waves, so that the subharmonics resonance or the higher harmonics resonance can be judged by adopting the zero sequence voltage total effective value Uz; and when the zero-sequence voltage is in normal operation, the total effective value of the zero-sequence voltage is basically equal to the fundamental value of the zero-sequence voltage.
Further, the first predetermined ratio value has a value in the range of 1.1 to 1.4, i.e., the first predetermined ratio value is a value of
When the PT is in the normal state, the PT is judged to be in ferromagnetic resonance.
Further, the first preset ratio value is 1.2.
Further, PT ferromagnetic resonance ground connection route selection prevents maloperation protection device still includes: a second control module 5. The second control module 5 is used for instantly locking all the grounding line selection protection after judging that the PT ferromagnetic resonance occurs and locking the grounding line selection protection, and sending a PT ferromagnetic resonance alarm signal in a delayed mode.
Accordingly, a third aspect of the embodiments of the present invention further provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by a processor, and the instructions are executed by the processor to enable at least one processor to execute the PT ferroresonant grounding line selection anti-misoperation protection method.
In addition, a fourth aspect of the embodiments of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions, when executed by a processor, implement the PT ferroresonant grounded line selection anti-false operation protection method described above.
The embodiment of the invention aims to protect a PT ferromagnetic resonance grounding line selection anti-misoperation protection method and a PT ferromagnetic resonance grounding line selection anti-misoperation protection device, wherein the method comprises the following steps: acquiring a total zero sequence voltage effective value; acquiring a zero sequence voltage fundamental wave value; judging whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is larger than a first preset value or not; if the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is greater than a first preset value, judging that PT ferromagnetic resonance occurs, and locking the grounding line selection protection; and if the ratio value of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is less than or equal to a first preset value, judging that PT ferromagnetic resonance does not occur, and opening grounding line selection protection. The technical scheme has the following effects:
whether ferromagnetic resonance occurs or not is judged by comparing whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave is larger than a preset value or not, grounding line selection protection can be reliably locked when ferromagnetic resonance occurs, and can be quickly opened when ferromagnetic resonance does not occur, so that grounding line selection protection misoperation caused by PT ferromagnetic resonance is prevented when impact disturbance occurs to a power grid, and the safety of equipment is improved.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A PT ferromagnetic resonance grounding line selection anti-misoperation protection method is characterized by comprising the following steps:
acquiring a total zero sequence voltage effective value;
acquiring a zero sequence voltage fundamental wave value;
judging whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is larger than a first preset value or not;
if the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is greater than the first preset value, judging that PT ferromagnetic resonance occurs, and locking grounding line selection protection;
and if the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is less than or equal to the first preset value, judging that the PT ferromagnetic resonance does not occur, and opening the grounding line selection protection.
2. The PT ferroresonant grounded line selection anti-malfunction protection method of claim 1,
the total effective value of the zero sequence voltage comprises: all subharmonic, ultraharmonic and fundamental components.
3. The PT ferroresonant grounded line selection anti-malfunction protection method of claim 1,
the numerical range of the first preset proportion value is 1.1-1.4.
4. The PT ferroresonant grounded line selection anti-malfunction protection method of claim 1,
the first preset proportion value is 1.2.
5. The PT ferroresonance grounded line selection anti-malfunction protection method of claim 1, wherein after determining that PT ferroresonance occurs and locking out grounded line selection protection, further comprising:
and instantaneously locking all the grounding line selection protection, and sending PT ferromagnetic resonance alarm signals in a delayed mode.
6. A PT ferroresonance grounding line selection anti-misoperation protection device is characterized by comprising:
the first acquisition module is used for acquiring a total zero sequence voltage effective value;
the second acquisition module is used for acquiring a zero sequence voltage fundamental wave value;
the judging module is used for judging whether the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is larger than a first preset value or not;
the first control module is used for judging that PT ferromagnetic resonance occurs and locking grounding line selection protection when the proportion value of the zero sequence voltage total effective value and the zero sequence voltage fundamental wave value is larger than a first preset value;
and the first control module is further used for judging that the PT ferromagnetic resonance does not occur and opening grounding line selection protection when the ratio of the zero sequence voltage total effective value to the zero sequence voltage fundamental wave value is less than or equal to the first preset value.
7. The PT ferroresonant grounded wire selection anti-malfunction protection device of claim 1,
the total effective value of the zero sequence voltage comprises: all subharmonic, ultraharmonic and fundamental components.
8. The PT ferroresonant grounded wire selection anti-malfunction protection device of claim 1,
the numerical range of the first preset proportion value is 1.1-1.4.
9. The PT ferroresonant grounded wire selection anti-malfunction protection device of claim 1,
the first preset proportion value is 1.2.
10. The PT ferroresonant grounded-line selection anti-malfunction protection device of claim 1, further comprising:
and the second control module is used for instantaneously locking all the grounding line selection protection after judging that the PT ferromagnetic resonance occurs and locking the grounding line selection protection, and sending a PT ferromagnetic resonance alarm signal in a delayed mode.
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| CN117250557A (en) * | 2023-11-14 | 2023-12-19 | 武汉格蓝若智能技术股份有限公司 | Small-current grounding line selection starting method and device based on ferromagnetic resonance identification |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0698457A (en) * | 1991-11-28 | 1994-04-08 | Kansai Electric Power Co Inc:The | Cause judgment method of ground fault of high-voltage distribution line |
| DE10302451B3 (en) * | 2003-01-22 | 2004-07-15 | Edc Gmbh | Earthing connection recognition method for 3-phase network using evaluation of charge curve obtained by integration of current from voltage zero transition and zero voltage limit value point |
| CN101022216A (en) * | 2007-02-07 | 2007-08-22 | 燕山大学 | Small earthing current electric network single phase fault wire selecting method and apparatus |
| WO2008046309A1 (en) * | 2006-10-18 | 2008-04-24 | Zhang Yunyi | A method and a device for managing electric network non-power frequency |
| EP2006694A1 (en) * | 2007-06-21 | 2008-12-24 | Schneider Electric Industries SAS | Localised insulation control and measurement device for a power grid with insulated neutral |
| CN103199514A (en) * | 2013-02-25 | 2013-07-10 | 重庆大学 | Method of eliminating ferromagnetic resonances |
| CN103728538A (en) * | 2013-12-30 | 2014-04-16 | 国家电网公司 | Ground fault line selecting method for small current grounding system |
| CN203811747U (en) * | 2014-02-20 | 2014-09-03 | 国投新集能源股份有限公司 | A small current grounding line selection system |
| CN108318762A (en) * | 2018-02-28 | 2018-07-24 | 南京南瑞继保电气有限公司 | The method of discrimination of voltage transformer power frequency ferromagnetic resonance |
| CN110146780A (en) * | 2019-04-24 | 2019-08-20 | 国网江苏省电力有限公司电力科学研究院 | Discrimination method of ferromagnetic resonance in neutral point ungrounded flexible distribution network system |
| US20200150191A1 (en) * | 2018-11-08 | 2020-05-14 | Hangzhou Qiuchuang Electric Power Science&Technology Co., Ltd. | Zero-sequence parameter measurement and ground voltage control method for resonant ground system based on virtual ground principle |
| CN112782494A (en) * | 2019-11-05 | 2021-05-11 | 南京南瑞继保电气有限公司 | Saturation identification method and device for shunt reactor |
-
2021
- 2021-08-24 CN CN202110973060.1A patent/CN113746071B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0698457A (en) * | 1991-11-28 | 1994-04-08 | Kansai Electric Power Co Inc:The | Cause judgment method of ground fault of high-voltage distribution line |
| DE10302451B3 (en) * | 2003-01-22 | 2004-07-15 | Edc Gmbh | Earthing connection recognition method for 3-phase network using evaluation of charge curve obtained by integration of current from voltage zero transition and zero voltage limit value point |
| WO2008046309A1 (en) * | 2006-10-18 | 2008-04-24 | Zhang Yunyi | A method and a device for managing electric network non-power frequency |
| CN101022216A (en) * | 2007-02-07 | 2007-08-22 | 燕山大学 | Small earthing current electric network single phase fault wire selecting method and apparatus |
| EP2006694A1 (en) * | 2007-06-21 | 2008-12-24 | Schneider Electric Industries SAS | Localised insulation control and measurement device for a power grid with insulated neutral |
| CN103199514A (en) * | 2013-02-25 | 2013-07-10 | 重庆大学 | Method of eliminating ferromagnetic resonances |
| CN103728538A (en) * | 2013-12-30 | 2014-04-16 | 国家电网公司 | Ground fault line selecting method for small current grounding system |
| CN203811747U (en) * | 2014-02-20 | 2014-09-03 | 国投新集能源股份有限公司 | A small current grounding line selection system |
| CN108318762A (en) * | 2018-02-28 | 2018-07-24 | 南京南瑞继保电气有限公司 | The method of discrimination of voltage transformer power frequency ferromagnetic resonance |
| US20200150191A1 (en) * | 2018-11-08 | 2020-05-14 | Hangzhou Qiuchuang Electric Power Science&Technology Co., Ltd. | Zero-sequence parameter measurement and ground voltage control method for resonant ground system based on virtual ground principle |
| CN110146780A (en) * | 2019-04-24 | 2019-08-20 | 国网江苏省电力有限公司电力科学研究院 | Discrimination method of ferromagnetic resonance in neutral point ungrounded flexible distribution network system |
| CN112782494A (en) * | 2019-11-05 | 2021-05-11 | 南京南瑞继保电气有限公司 | Saturation identification method and device for shunt reactor |
Non-Patent Citations (4)
| Title |
|---|
| 何智强;李欣;范敏;秦家远;: "基于消谐器抑制铁磁谐振过电压研究分析", 电瓷避雷器, no. 05, 25 October 2017 (2017-10-25), pages 83 - 90 * |
| 刘鸿雏，文寅求: "消除10kV系统铁磁谐振过电压措施及其分析", 内蒙古电力技术, no. 2, 31 December 1995 (1995-12-31), pages 27 - 30 * |
| 朱兰, 杨奇逊, 张利, 李砚, 初源良, 杨以涵: "小电流接地系统单相接地故障选线防止误判的有效方法探讨", 现代电力, no. 06, 30 December 2002 (2002-12-30), pages 51 - 56 * |
| 王建赜, 吴启涛, 纪延超, 柳焯: "新型小电流接地系统选线消谐装置的研制", 继电器, no. 05, 25 May 2001 (2001-05-25), pages 36 - 38 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117250557A (en) * | 2023-11-14 | 2023-12-19 | 武汉格蓝若智能技术股份有限公司 | Small-current grounding line selection starting method and device based on ferromagnetic resonance identification |
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