CN114498304A - Intelligent protection equipment and protection method for controllable gap of transformer neutral point mechanism - Google Patents
Intelligent protection equipment and protection method for controllable gap of transformer neutral point mechanism Download PDFInfo
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- CN114498304A CN114498304A CN202111439765.1A CN202111439765A CN114498304A CN 114498304 A CN114498304 A CN 114498304A CN 202111439765 A CN202111439765 A CN 202111439765A CN 114498304 A CN114498304 A CN 114498304A
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 97
- 230000007246 mechanism Effects 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 23
- 230000009471 action Effects 0.000 claims abstract description 14
- 210000000078 claw Anatomy 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 16
- 238000004590 computer program Methods 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/08—Overvoltage arresters using spark gaps structurally associated with protected apparatus
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a mechanical configuration type controllable gap intelligent protection device and a protection method for a neutral point of a transformer, wherein the device is connected with an arrester for the neutral point of the transformer in parallel and coacts with the arrester to protect the neutral point of the transformer; the apparatus comprises: a gap, a mechanism and a controller; one end of the gap is connected with a neutral point of the transformer, and the other end of the gap is respectively connected with one end of the mechanism and the grounding end; the other end of the mechanism is connected with the controller; the controller is used for sending a tripping command to the mechanism when a voltage signal measured by a bus PT opening triangle is larger than or equal to a preset action threshold value so as to enable the mechanism to trip, and therefore the distance between the gaps is changed; the invention can solve the problems that the arrester is easy to generate danger under power frequency overvoltage, the gap generates wave interception under lightning impulse, the gap is difficult to be in insulation fit with the arrester in parallel protection, and the like, and can provide reliable and complete protection for the neutral point of the 110kV and 220kV transformers.
Description
Technical Field
The invention relates to the technical field of overvoltage protection of power systems, in particular to intelligent protection equipment and a protection method for a transformer neutral point mechanism-shaped controllable gap.
Background
In order to limit single-phase grounding short-circuit current and prevent the requirements of communication interference, relay protection setting configuration and the like, in 110kV and 220kV neutral point effective grounding systems, partial transformer neutral points often adopt a non-grounding operation mode. During operation, the transformer neutral may be subjected to lightning, operational, power frequency and resonance overvoltages that may damage the insulation of the transformer neutral.
At present, single rod gap protection, single zinc oxide arrester protection and gapless zinc oxide arrester and rod-rod gap parallel protection are commonly adopted for the neutral point of an ungrounded transformer in China, and as shown in figure 1, the problem of protection of the neutral point of the transformer is not well solved. The problems that exist include:
(1) under the action of lightning impulse, the gaps of the single rod are broken down to generate wave interception, so that the insulation of the neutral point of the transformer is endangered; in addition, in actual operation, since the protective gap cannot self-extinguish the arc, the arc needs to be cut off by relay protection, thereby possibly causing a relay protection misoperation problem.
(2) The single metal oxide arrester is easy to damage or explode under the conditions that the system is in single-phase short circuit grounding and loses the ground or runs in a non-full phase mode and the like.
(3) The gapless metal oxide arrester is connected with the rod-rod gap in parallel, and the realization is very difficult because the matching requirements of the arrester protection level, the rod gap action characteristic and the insulation level of the transformer neutral point are very strict.
Disclosure of Invention
The invention provides intelligent protective equipment and a protective method for a transformer neutral point mechanism type controllable gap, which aim to solve the problems that an arrester is easy to generate danger under power frequency overvoltage, the gap generates wave interception under lightning impact, the gap is difficult to be in insulation fit with the arrester in parallel protection, and the like.
In order to solve the above problems, according to one aspect of the present invention, there is provided a transformer neutral point mechanism type controllable gap intelligent protection device, which is connected in parallel with an arrester for a transformer neutral point, and is configured to cooperate with the arrester for the transformer neutral point to protect the transformer neutral point; the apparatus comprises: a gap, a mechanism and a controller; wherein the content of the first and second substances,
one end of the gap is connected with a neutral point of the transformer, and the other end of the gap is respectively connected with one end of the mechanism and the grounding end; the other end of the mechanism is connected with the controller;
and the controller is used for sending a tripping command to the mechanism when a voltage signal measured by a bus PT opening triangle is greater than or equal to a preset action threshold value, so that the mechanism is tripped, and the distance between the gaps is changed.
Preferably, wherein the device cooperates with a surge arrester of the transformer neutral to protect the transformer neutral, comprises:
when the system normally operates or single-phase grounding overvoltage occurs, the mechanism is in a locking state, the distance between the gaps is larger than a first preset distance threshold value, and the gaps and the lightning arrester do not act;
when the lightning surge occurs, the mechanism is in a locking state, the distance between the gaps is larger than a first preset distance threshold value, the gaps do not act, and the lightning arrester acts to limit overvoltage of a neutral point of the transformer;
when the system is threatened, the single-phase grounding of the neutral point insulation of the transformer is carried out, and the earth loss or the non-full-phase operation power frequency overvoltage occurs, the controller determines that a voltage signal measured from a bus PT opening triangle is larger than or equal to a preset action threshold value, a tripping instruction is sent to the mechanism, the mechanism trips according to the tripping instruction, the distance between the gaps is shortened to a second preset distance threshold value, the gaps break down, the neutral point insulation of the transformer is protected, and the lightning arrester is protected.
Preferably, wherein the gap is of the type of a stick, a claw, a circular arc, a ball or an arrow.
Preferably, for a 110kV transformer neutral point, the first preset distance threshold is greater than 170mm, and the second preset distance threshold is less than 95 mm.
Preferably, for a 220kV transformer neutral point, the first preset distance threshold is greater than 385mm, and the second preset distance threshold is less than 240 mm.
According to another aspect of the invention, the invention provides a method for protecting a transformer neutral point based on the transformer neutral point mechanism type controllable gap intelligent protection device, which comprises the following steps:
when the system normally operates or single-phase grounding overvoltage occurs, the mechanism is in a locking state, the distance between the gaps is larger than a first preset distance threshold value, and the gaps and the lightning arrester do not act;
when the lightning surge occurs, the mechanism is in a lock catch state, the distance between the gaps is larger than a first preset distance threshold value, the gaps do not act, and the lightning arrester acts to limit overvoltage of a neutral point of the transformer;
when the system is threatened, the single-phase grounding of the neutral point insulation of the transformer is carried out, and the earth loss or the non-full-phase operation power frequency overvoltage occurs, the controller determines that a voltage signal measured from a bus PT opening triangle is larger than or equal to a preset action threshold value, a tripping instruction is sent to the mechanism, the mechanism trips according to the tripping instruction, the distance between the gaps is shortened to a second preset distance threshold value, the gaps break down, the neutral point insulation of the transformer is protected, and the lightning arrester is protected.
The invention provides intelligent protection equipment and a protection method for a mechanical configuration controllable gap of a neutral point of a transformer, wherein the equipment is connected with an arrester for the neutral point of the transformer in parallel and is used for coaction with the arrester for the neutral point of the transformer so as to protect the neutral point of the transformer; the apparatus comprises: a gap, a mechanism and a controller; one end of the gap is connected with a neutral point of the transformer, and the other end of the gap is respectively connected with one end of the mechanism and the grounding end; the other end of the mechanism is connected with the controller; the controller is used for sending a tripping instruction to the mechanism when a voltage signal measured by a bus PT opening triangle is greater than or equal to a preset action threshold value, so that the mechanism is tripped, and the distance between the gaps is changed; the mechanical structure type gap-controllable intelligent protection equipment can be effectively matched with a neutral point lightning arrester of a transformer, solves the problems that the lightning arrester is easy to generate danger under power frequency overvoltage, the gap generates wave interception under lightning impact, the gap is difficult to be in insulation matching with the lightning arrester in parallel protection, and the like, and can provide reliable and complete protection for neutral points of 110kV and 220kV transformers.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic diagram of a conventional transformer neutral point protection method;
fig. 2 is a schematic structural diagram of a transformer neutral point configuration controlled gap intelligent protection device 200 according to an embodiment of the present invention;
fig. 3 (a) and (b) are schematic diagrams of a rod-and-bar-type gap-based transformer neutral point mechanism type controllable gap intelligent protection device according to an embodiment of the invention when the device is not actuated and actuated, respectively;
fig. 4 (a) and (b) are schematic diagrams of a transformer neutral point mechanism configuration controllable gap intelligent protection device based on a claw-type gap according to an embodiment of the invention when the device is not actuated and actuated, respectively;
fig. 5 (a) and (b) are schematic diagrams of a transformer neutral point mechanism type controllable gap intelligent protection device based on an arc-shaped gap according to an embodiment of the present invention when the device is not actuated and actuated, respectively;
fig. 6 (a) and (b) are schematic diagrams of a transformer neutral point mechanism type controllable gap intelligent protection device based on a ball-head type gap according to an embodiment of the invention when the device is not operated and is operated respectively;
fig. 7 (a) and (b) are schematic diagrams of an arrow-type gap-based transformer neutral point mechanism type controllable gap intelligent protection device according to an embodiment of the invention when the device is not actuated and actuated respectively;
fig. 8 is a flowchart of a protection method 800 for a transformer neutral configuration-based controlled gap intelligent protection device according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 2 is a schematic structural diagram of a transformer neutral point configuration controlled gap intelligent protection device 200 according to an embodiment of the present invention. As shown in fig. 2, the intelligent protection device with the controllable gap for the neutral point mechanism of the transformer provided by the embodiment of the invention can be effectively matched with the arrester of the neutral point of the transformer, so that the problems that the arrester is easy to generate danger under power frequency overvoltage, the gap generates chopping waves under lightning impact, the gap is difficult to be in insulation matching with the arrester in parallel protection and the like are solved, and reliable and complete protection can be provided for the neutral points of the transformers of 110kV and 220 kV. The intelligent protection device 200 with the controllable gap and the mechanical configuration for the neutral point of the transformer is connected with the lightning arrester for the neutral point of the transformer in parallel and used for coacting with the lightning arrester for the neutral point of the transformer to protect the neutral point of the transformer. The apparatus 200 comprises: gap 201, mechanism 202, and controller 203.
One end of the gap 201 is connected with a neutral point of a transformer, and the other end of the gap is respectively connected with one end of the mechanism 202 and a grounding end; the other end of the mechanism is connected to the controller 203. The controller 203 is configured to send a tripping command to the mechanism when a voltage signal measured from a bus PT opening triangle is greater than or equal to a preset action threshold, so that the mechanism is tripped, and thus a distance between the gaps is changed.
Preferably, wherein the device cooperates with a surge arrester of the transformer neutral to protect the transformer neutral, comprises:
when the system normally operates or single-phase grounding overvoltage occurs, the mechanism is in a locking state, the distance between the gaps is larger than a first preset distance threshold value, and the gaps and the lightning arrester do not act;
when the lightning surge occurs, the mechanism is in a lock catch state, the distance between the gaps is larger than a first preset distance threshold value, the gaps do not act, and the lightning arrester acts to limit overvoltage of a neutral point of the transformer;
when the system is threatened, the single-phase grounding of the neutral point insulation of the transformer is carried out, and the earth loss or the non-full-phase operation power frequency overvoltage occurs, the controller determines that a voltage signal measured from a bus PT opening triangle is larger than or equal to a preset action threshold value, a tripping instruction is sent to the mechanism, the mechanism trips according to the tripping instruction, the distance between the gaps is shortened to a second preset distance threshold value, the gaps break down, the neutral point insulation of the transformer is protected, and the lightning arrester is protected.
Preferably, for a 110kV transformer neutral point, the first preset distance threshold is greater than 170mm, and the second preset distance threshold is less than 95 mm.
Preferably, for a 220kV transformer neutral point, the first preset distance threshold is greater than 385mm, and the second preset distance threshold is less than 240 mm.
In the embodiment of the invention, when the system is in normal operation and single-phase grounding overvoltage is generated in the system, the mechanism is in a locking state, the distance between the gaps is greater than a first preset threshold value L1, and neither the gap nor the lightning arrester moves.
Under lightning impulse, the mechanism is in a lock-latch state, the distance between the gaps is larger than a first preset threshold value L1, at the moment, the gaps do not act, the lightning arrester acts, and therefore overvoltage of a neutral point of the transformer is limited.
When the system generates single-phase grounding threatening the neutral point insulation of the transformer and loses the ground or is not in full-phase operation power frequency overvoltage, if a voltage signal measured from a bus PT meets a preset action threshold value, a controller sends a tripping instruction to the mechanism to trip the mechanism, so that the gap distance is shortened to be a second preset threshold value, the gap is broken down, and the neutral point insulation of the transformer and the lightning arrester are reliably protected.
Wherein, the suggested value ranges of L1 and L2 are: (1) for a 110kV transformer neutral point, L1 is more than 170mm, and L2 is less than 95 mm; (2) for a 110kV transformer neutral point, L1>385mm, and L2<240 mm.
Preferably, wherein the apparatus further comprises:
and the zero sequence current protection current transformer is respectively connected with the other end of the gap and the grounding end and is used for providing a zero sequence current signal for the relay protection equipment.
Preferably, the zero sequence current protection current transformer is an outdoor dry type.
Preferably, the model of the zero sequence current protection current transformer is: 200-400/5A, 5VA, 10P 20.
In an embodiment of the present invention, the apparatus may further include a zero sequence current protection current transformer connected to the other end of the gap and the ground terminal, respectively, and configured to provide a zero sequence current signal for the relay protection apparatus, where the current transformer may be of an outdoor dry type, and may be 200-400/5a, 5VA, or 10P 20.
Preferably, wherein the gap is of the type of a stick, a claw, a circular arc, a ball or an arrow.
In the embodiment of the present invention, the gap may adopt 5 types of a stick type, a claw type, a circular arc type, a ball type, and an arrow type, as shown in fig. 3, 4, 5, 6, and 7, respectively. Wherein, for fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, (a) the mechanisms are all in a locked state, and (b) the mechanisms are all in an unlocked state. When the system normally operates and single-phase grounding overvoltage or lightning overvoltage occurs in the system, the mechanism is in a locking state, and the gap distance is in a first preset distance threshold value. When the system generates single-phase grounding threatening the insulation of the neutral point of the transformer and loses the ground or is not in full-phase operation power frequency overvoltage, the controller controls the mechanism to trip, so that the gap distance is shortened to be the second preset distance threshold value, the gap is reliably punctured, and the insulation of the neutral point of the transformer and the lightning arrester are reliably protected.
Fig. 8 is a flowchart of a protection method 800 for a transformer neutral configuration-based controlled gap intelligent protection device according to an embodiment of the present invention. As shown in fig. 8, in a method 800 for protecting a transformer neutral point based on a controllable gap intelligent protection device configured as the transformer neutral point mechanism according to the embodiment of the present invention, starting from step 801, when a system is in normal operation or a single-phase ground-neutral overvoltage occurs in the system, the mechanism is in a locked state, a distance between the gaps is greater than a first preset distance threshold, and neither the gap nor the lightning arrester is in operation in step 801.
In step 802, when under lightning impulse, the mechanism is in a latched state, the distance between the gaps is greater than a first preset distance threshold, the gaps do not act, and the lightning arrester acts to limit transformer neutral overvoltage.
In step 803, when the system is threatened, and the single-phase grounding of the transformer neutral point insulation and the earth loss or the non-full-phase operation power frequency overvoltage occur, the controller determines that a voltage signal measured from a bus PT opening triangle is greater than or equal to a preset action threshold value, and sends a tripping instruction to the mechanism, the mechanism trips according to the tripping instruction, so that the distance between the gaps is shortened to a second preset distance threshold value, the gaps break down, the transformer neutral point insulation is protected, and the lightning arrester is protected.
The protection method 800 of the transformer neutral point configuration-based controllable gap intelligent protection device according to the embodiment of the present invention corresponds to the transformer neutral point configuration-based controllable gap intelligent protection device 100 according to the embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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 (6)
1. A transformer neutral point mechanism type controllable gap intelligent protection device is characterized in that the device is connected with an arrester for a transformer neutral point in parallel and used for coacting with the arrester for the transformer neutral point to protect the transformer neutral point; the apparatus comprises: a gap, a mechanism and a controller; wherein the content of the first and second substances,
one end of the gap is connected with a neutral point of the transformer, and the other end of the gap is respectively connected with one end of the mechanism and the grounding end; the other end of the mechanism is connected with the controller;
and the controller is used for sending a tripping command to the mechanism when a voltage signal measured by a bus PT opening triangle is greater than or equal to a preset action threshold value, so that the mechanism is tripped, and the distance between the gaps is changed.
2. The apparatus of claim 1, wherein the apparatus coacts with a surge arrester of a transformer neutral to protect the transformer neutral, comprising:
when the system normally operates or single-phase grounding overvoltage occurs, the mechanism is in a locking state, the distance between the gaps is larger than a first preset distance threshold value, and the gaps and the lightning arrester do not act;
when the lightning surge occurs, the mechanism is in a lock catch state, the distance between the gaps is larger than a first preset distance threshold value, the gaps do not act, and the lightning arrester acts to limit overvoltage of a neutral point of the transformer;
when the system is threatened, the single-phase grounding of the neutral point insulation of the transformer is carried out, and the earth loss or the non-full-phase operation power frequency overvoltage occurs, the controller determines that a voltage signal measured from a bus PT opening triangle is larger than or equal to a preset action threshold value, a tripping instruction is sent to the mechanism, the mechanism trips according to the tripping instruction, the distance between the gaps is shortened to a second preset distance threshold value, the gaps break down, the neutral point insulation of the transformer is protected, and the lightning arrester is protected.
3. The apparatus according to claim 1, characterized in that said gap is of the type of a bar, a claw, a circular arc, a ball or an arrow.
4. The apparatus of claim 2, wherein the first predetermined distance threshold is greater than 170mm and the second predetermined distance threshold is less than 95mm for a 110kV transformer neutral.
5. The apparatus of claim 2, the first preset distance threshold being greater than 385mm and the second preset distance threshold being less than 240mm for a 220kV transformer neutral.
6. A method for protecting a transformer neutral point based on the transformer neutral point mechanism type controllable gap intelligent protection device according to any one of claims 1-5, wherein the method comprises the following steps:
when the system normally operates or single-phase grounding overvoltage occurs, the mechanism is in a locking state, the distance between the gaps is larger than a first preset distance threshold value, and the gaps and the lightning arrester do not act;
when the lightning surge occurs, the mechanism is in a lock catch state, the distance between the gaps is larger than a first preset distance threshold value, the gaps do not act, and the lightning arrester acts to limit overvoltage of a neutral point of the transformer;
when the system is threatened, the single-phase grounding of the neutral point insulation of the transformer is carried out, and the earth loss or the non-full-phase operation power frequency overvoltage occurs, the controller determines that a voltage signal measured from a bus PT opening triangle is larger than or equal to a preset action threshold value, a tripping instruction is sent to the mechanism, the mechanism trips according to the tripping instruction, the distance between the gaps is shortened to a second preset distance threshold value, the gaps break down, the neutral point insulation of the transformer is protected, and the lightning arrester is protected.
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| CN109217250A (en) * | 2018-10-11 | 2019-01-15 | 天津择东能源科技股份有限公司 | A kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method |
| CN112310813A (en) * | 2020-11-19 | 2021-02-02 | 西安热工研究院有限公司 | Environment self-adaptive transformer neutral point protection discharge gap device |
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2021
- 2021-11-30 CN CN202111439765.1A patent/CN114498304A/en active Pending
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| CN1933268A (en) * | 2006-09-06 | 2007-03-21 | 中国电力科学研究院 | Controllable gap for protecting transformer neutral point |
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| CN107276061A (en) * | 2017-06-22 | 2017-10-20 | 天津择东能源科技股份有限公司 | A kind of 110kV transformer neutral points protection device and method |
| CN109217250A (en) * | 2018-10-11 | 2019-01-15 | 天津择东能源科技股份有限公司 | A kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method |
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Application publication date: 20220513 |