CN109217250A - A kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method - Google Patents
A kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method Download PDFInfo
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- CN109217250A CN109217250A CN201811184015.2A CN201811184015A CN109217250A CN 109217250 A CN109217250 A CN 109217250A CN 201811184015 A CN201811184015 A CN 201811184015A CN 109217250 A CN109217250 A CN 109217250A
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims description 21
- 238000009413 insulation Methods 0.000 claims abstract description 31
- 230000007613 environmental effect Effects 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 229910052573 porcelain Inorganic materials 0.000 claims description 7
- 238000003786 synthesis reaction Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 239000013264 metal-organic assembly Substances 0.000 description 3
- 206010073131 oligoastrocytoma Diseases 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229960001296 zinc oxide Drugs 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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
- H02H7/04—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 for transformers
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of closed intelligent protection devices of 110kV and 220kV transformer neutral point, comprising: controller and the controllable high speed grounding switch and the arrester that are closed in bushing.Controller; the single-phase earthing and lost territory or open-phase operation power-frequency overvoltage for threatening transformer neutral point to insulate for system generation; and when the voltage signal of bus-bar potential transformer measurement meets preset switch motion threshold value; controllable high speed grounding switch closure is controlled, reliably protecting is carried out to transformer neutral point insulation and arrester；Arrester protects transformer neutral point insulation under thunder and lightning and switching overvoltage, being acted with limiting transformer neutral point overvoltage.The present invention uses closed protected mode, and the acting characteristic of device can be made not influenced by environmental factor；The advantage of arrester and controllable high speed grounding switch respectively is taken full advantage of, most reliable, complete protection can be provided for 110kV and 220kV transformer neutral point, substantially increases the stability and safety of system.
Description
Technical field
The present invention relates to transformer neutral point protection technique fields, and more particularly, to a kind of 110kV and 220kV
The closed intelligent protection device of transformer neutral point and guard method.
Background technique
For limit short circuit current in single phase grounding, prevent communication interference and relay protection adjusting configure etc. require, 110kV and
In 220kV system with effectively earthed neutral, some transformers neutral point often takes the earth-free method of operation.In the process of running,
Transformer neutral point may bear thunder and lightning, operation, power frequency and resonance overvoltage, these overvoltage may be to transformer neutrality
The insulation of point damages.
Currently, the earth-free transformer neutral point in China is protected frequently with single stick gap protection, single Zinc-Oxide Arrester
With zero-clearance zinc oxide lightning arrester protection in parallel with rod-rod gap, as shown in Fig. 1, all do not well solve in transformer
The protection problem of property point.(1) under lightning impulse effect, gap breakdown generates wave chopping in single stick gap, jeopardizes transformer neutrality
Point insulating；In addition, needing thus may be used by relay protection breaking arc in actual operation since portable protective gaps are unable to self arc
Protective relaying maloperation problem can be caused.(2) single metal oxide arrester system occur single-phase short circuit ground connection and lost territory or
Damage or explosion are easy to happen when open-phase operation.(3) gapless metal-oxide lighting arrester and rod-rod gap be simultaneously
Connection, since the cooperation between protection of arrester level, stick gap acting characteristic and the dielectric level of transformer neutral point requires very
Harshness is realized extremely difficult.
All have the defects that in view of the protection in parallel with arrester of gap, arrester and gap it is intrinsic, how for 110kV and
220kV transformer neutral point provides reliably and complete protection is urgent problem.
Summary of the invention
The present invention proposes a kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method, with
Solve the problems, such as how reliable and complete protection is provided for 110kV and 220kV transformer neutral point.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided in a kind of 110kV and 220kV transformer
The property closed intelligent protection device of point, described device include: controller and the controllable rapid grounding that is closed in bushing
Switch and arrester, are used in combination by the controllable high speed grounding switch and arrester, and synthesis is controlled to transformer
Neutral point is protected；
The controller occurs to threaten the single-phase earthing of transformer neutral point insulation and lost territory or non-three phase is transported for system
Row power-frequency overvoltage, and the voltage signal of bus-bar potential transformer measurement controls institute when meeting preset switch motion threshold value
Controllable high speed grounding switch closure is stated, reliably protecting is carried out to transformer neutral point insulation and arrester；
The arrester, for being acted with limiting transformer neutral point overvoltage under thunder and lightning and switching overvoltage,
Protect transformer neutral point insulation.
Preferably, wherein for 110kV transformer neutral point, the controllable high speed grounding switch at least uses 72.5kV electric
Press grade；
For 220kV transformer neutral point, the controllable high speed grounding switch at least uses 126kV voltage class.
Preferably, wherein the controller includes:
Detection module, for detecting bus three-phase voltage；
Low-pass filtering module, for being filtered to the bus three-phase voltage of monitoring；
Virtual value computing module obtains electricity for carrying out virtual value calculating to the bus three-phase voltage by filtering processing
It is pressed with valid value；
Logic control module, for judging whether the voltage effective value is more than or equal to preset switch motion threshold value, if
When the voltage effective value is more than or equal to preset switch motion threshold value, order of closing a floodgate is sent to switch control module, controls institute
It states controllable high speed grounding switch and carries out feed motion；Conversely, sending separating brake order to switch control module, control described controllable fast
Fast earthing switch carries out separating brake movement.
Preferably, wherein the bushing is porcelain, SF is filled in closed bushing6、N2And environmental type
The insulating gas of gas mixing.
Preferably, wherein for 110kV transformer neutral point, the voltage rating of arrester is 60kV, continuous running voltage
For 48kV, nominal discharge current 1.5kA；Or the voltage rating of arrester is 72kV, continuous running voltage 58kV is nominally put
Electric current 1.5kA；
For 220kV transformer neutral point, the voltage rating of arrester is 146kV；Continuous running voltage is 116kV, mark
Claim discharge current 1.5kA.
According to the other side of invention, provides a kind of pair of 110kV and 220kV transformer neutral point and carry out protection side
Method, which comprises be used in combination by controllable high speed grounding switch and arrester, synthesis is controlled in transformer
Property point is protected, wherein
When the single-phase earthing and lost territory or open-phase operation power-frequency overvoltage of transformer neutral point insulation occur to threaten for system,
And when the voltage signal of bus-bar potential transformer measurement meets preset switch motion threshold value, controlled using controller controllable fast
It closes the switch to quick access, reliably protecting is carried out to transformer neutral point insulation and arrester；
Under thunder and lightning and switching overvoltage, arrester is acted with limiting transformer neutral point overvoltage, protects transformation
Device neutral point insulation.
Preferably, wherein for 110kV transformer neutral point, the controllable high speed grounding switch at least uses 72.5kV electric
Press grade；
For 220kV transformer neutral point, the controllable high speed grounding switch at least uses 126kV voltage class.
Preferably, it wherein described control controllable high speed grounding switch closure using controller, insulate to transformer neutral point
Reliably protecting is carried out with arrester, comprising:
Bus three-phase voltage is detected using detection module；
It is filtered using bus three-phase voltage of the low-pass filtering module to monitoring；
Virtual value calculating is carried out to the bus three-phase voltage by filtering processing using virtual value computing module, obtains voltage
Virtual value；
Judge whether the voltage effective value is more than or equal to preset switch motion threshold value using Logic control module, if institute
When stating voltage effective value more than or equal to preset switch motion threshold value, order of closing a floodgate is sent to switch control module, described in control
Controllable high speed grounding switch carries out feed motion, carries out reliably protecting to transformer neutral point insulation and arrester.
Preferably, wherein the bushing is porcelain, closed bushing is interior filled with SF6, N2 and environmentally protective
The insulating gas of type gas mixing.
Preferably, wherein for 110kV transformer neutral point, the voltage rating of arrester is 60kV, continuous running voltage
For 48kV, nominal discharge current 1.5kA；Or the voltage rating of arrester is 72kV, continuous running voltage 58kV is nominally put
Electric current 1.5kA；
For 220kV transformer neutral point, the voltage rating of arrester is 146kV；Continuous running voltage is 116kV, mark
Claim discharge current 1.5kA.
The present invention provides a kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method,
Mainly it is used in combination by controllable high speed grounding switch with arrester, synthesis is controlled to protect to transformer neutral point,
It include: to work as the single-phase earthing and lost territory or open-phase operation power-frequency overvoltage that system generation threatens transformer neutral point to insulate, from
When the voltage signal that bus-bar potential transformer measures meets set switch motion threshold value, controlled using controller controllable quick
Earthing switch closure carries out reliably protecting to transformer neutral point insulation and arrester；Under thunder and lightning and switching overvoltage, take shelter from the thunder
Device is acted with limiting transformer neutral point overvoltage, and transformer neutral point insulation is protected.Protective device of the invention is cancelled
In previous protective device frequently with open type the air gap the movement of device can be made special using closed protected mode
Property is not influenced by factors such as environment temperature, humidity, height above sea levels；It takes full advantage of arrester and controllable high speed grounding switch is each
From the advantages of, efficiently solve that arrester is easily caused danger under power-frequency overvoltage, gap generates wave chopping under lightning impulse
There is a problem of Insulation Coordination difficulty in equal gaps protection in parallel with arrester, can be 110kV and 220kV transformer neutral point
Most reliable, complete protection is provided, the stability and safety of system are substantially increased.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is that existing transformer neutral point protects schematic diagram；
Fig. 2 is the closed intelligent protection device of 110kV and 220kV transformer neutral point according to embodiment of the present invention
Structural schematic diagram；
Fig. 3 is the closed intelligent protection device of 110kV and 220kV transformer neutral point according to embodiment of the present invention
Arragement construction figure；And
Fig. 4 is the flow chart according to 110kV the and 220kV transformer neutral point guard method 400 of embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 2 is the closed intelligent protection device of 110kV and 220kV transformer neutral point according to embodiment of the present invention
200 structural schematic diagram.As shown in Fig. 2, 110kV the and 220kV transformer neutral point closing that embodiments of the present invention provide
Formula intelligent protection device eliminate in previous protective device frequently with open type the air gap, using closed protected mode,
Can make the acting characteristic of device is not influenced by factors such as environment temperature, humidity, height above sea levels；Take full advantage of arrester and
The controllable advantage of high speed grounding switch respectively, efficiently solves that arrester is easily caused danger under power-frequency overvoltage, gap exists
It is led to the problem of under lightning impulse in the protection in parallel with arrester of the gaps such as wave chopping there are Insulation Coordination difficulty, can be 110kV
Most reliable, complete protection is provided with 220kV transformer neutral point, substantially increases the stability and safety of system.This hair
The closed intelligent protection device 200 of 110kV and 220kV transformer neutral point that bright embodiment provides, comprising: controller
201 and the controllable high speed grounding switch 203 and arrester 204 that are closed in bushing 202, pass through the controllable fast quick access
Ground switch 203 and arrester 204 are used in combination, and synthesis is controlled to protect to transformer neutral point.
Preferably, the single-phase earthing and the lost territory that threaten transformer neutral point insulation occur for system for the controller 201
Or open-phase operation power-frequency overvoltage, and the voltage signal of bus-bar potential transformer measurement meets preset switch motion threshold value
When, the controllable high speed grounding switch closure is controlled, reliably protecting is carried out to transformer neutral point insulation and arrester.
Preferably, wherein the controller 201 includes: detection module, for detecting bus three-phase voltage；Low-pass filtering mould
Block, for being filtered to the bus three-phase voltage of monitoring；Virtual value computing module, for the mother by filtering processing
Line three-phase voltage carries out virtual value calculating, obtains voltage effective value；Logic control module, for judging that the voltage effective value is
It is no to be more than or equal to preset switch motion threshold value, if the voltage effective value is more than or equal to preset switch motion threshold value, hair
It send combined floodgate order to switch control module, controls the controllable high speed grounding switch and carry out feed motion；Conversely, sending separating brake life
It enables to switch control module, controls the controllable high speed grounding switch and carry out separating brake movement.
Preferably, wherein for 110kV transformer neutral point, the controllable high speed grounding switch at least uses 72.5kV electric
Press grade；For 220kV transformer neutral point, the controllable high speed grounding switch at least uses 126kV voltage class.
Preferably, the arrester 204, for being acted in limiting transformer under thunder and lightning and switching overvoltage
Property point overvoltage, protection transformer neutral point insulation.
Preferably, wherein for 110kV transformer neutral point, the voltage rating of arrester is 60kV, continuous running voltage
For 48kV, nominal discharge current 1.5kA；Or the voltage rating of arrester is 72kV, continuous running voltage 58kV is nominally put
Electric current 1.5kA；
For 220kV transformer neutral point, the voltage rating of arrester is 146kV；Continuous running voltage is 116kV, mark
Claim discharge current 1.5kA.
Preferably, wherein the bushing is porcelain, SF is filled in closed bushing6、N2And environmental type
The insulating gas of gas mixing.
Fig. 3 is the closed intelligent protection device of 110kV and 220kV transformer neutral point according to embodiment of the present invention
Arragement construction figure.As shown in figure 3, in embodiments of the present invention, the closed intelligence of 110kV and 220kV transformer neutral point
Protective device integrates controllable high speed grounding switch and controller, arrester, current transformer, casing, by transformer neutrality
The controllable high speed grounding switch of point is used in combination with neutral point MOA, comprehensively control.Eliminate in previous protective device frequently with
Gap, device action characteristic can be made not influenced by factors such as environment temperature, humidity, height above sea levels, substantially increase equipment
Action stability and reliability.In addition, protective device uses controllable high speed grounding switch, cancel gap, between can also avoiding
Gap acts the impact that generated wave chopping insulate to transformer neutral point, is more advantageous to protection transformer neutral point.
Closed design can effectively avoid outside environmental elements from greatly improving equipment to the influence and interference of protection equipment
Action stability and reliability.Meanwhile more conducively device miniaturization, effectively reduce the size and land occupation of equipment.In the present invention
Embodiment in, bushing is porcelain.It may include SF inside bushing6、N2, the insulation such as environmental type mixed gas
Gas, or may be set to be vacuum state.110kV transformer neutral point casing should be at least using 72.5kV voltage etc.
Grade；220kV transformer neutral point casing should at least use 126kV voltage class.
Closing time≤60ms of controllable high speed grounding switch, opening time≤100ms.Controllable high speed grounding switch breaks
Mouth position can be immediately seen by its fracture observation window.Generally, 110kV transformer neutral point should be used at least with earthing switch
72.5kV voltage class；220kV transformer neutral point earthing switch should at least use 126kV voltage class.Controllable fast quick access
The acting characteristic of ground switch is determined by controller.Control strategy includes: that system occurs to threaten the single-phase of transformer neutral point insulation
When ground connection and lost territory or open-phase operation power-frequency overvoltage, judge whether the voltage signal measured from bus-bar potential transformer meets
Default switch motion threshold value, if it is satisfied, then controlling controllable high speed grounding switch closure, reliably protecting transformer neutral point
Insulation and arrester；And under thunder and lightning and switching overvoltage, lightning arrestor movement, limiting transformer neutral point overvoltage, protection
Transformer neutral point insulation.
Controller is by detection module, low-pass filtering module, virtual value computing module, Logic control module, switch control mould
Block, and above-mentioned module is encapsulated into integral cabinet and is formed.Detection module is used for the acquisition of bus three-phase voltage, the electricity of acquisition
After pressure is worth low-pass filtered module filtered, carry out virtual value calculating, calculated result after Logic control module is judged, send to
Switch control module controls controllable high speed grounding switch and carries out combined floodgate or separating brake movement.
In embodiments of the present invention, arrester is closed gapless metal-oxide lighting arrester.110kV transformer
There are two types of neutral point MOAs: a kind of arrester voltage rating is 60kV, continuous running voltage 48kV, nominal discharge current
1.5kA；A kind of arrester voltage rating is 72kV, continuous running voltage 58kV, nominal discharge current 1.5kA；220kV transformation
Device neutral point MOA voltage rating is 146kV；Continuous running voltage is 116kV, nominal discharge current 1.5kA.
Zero-sequence current protection CT is for protecting system, and using outdoor dry type, 200-400/ is can be selected in specifications and models
5A, 5VA, 10P20.
Fig. 4 is the flow chart according to 110kV the and 220kV transformer neutral point guard method 400 of embodiment of the present invention.
As shown in figure 4, embodiments of the present invention offer passes through the progress guard method 400 of 110kV and 220kV transformer neutral point
Controllable high speed grounding switch and arrester are used in combination, and synthesis is controlled to protect to transformer neutral point.The present invention
Embodiment provide to 110kV and 220kV transformer neutral point carry out guard method 400 since step 401 place, in step
Rapid 401 occur to threaten the single-phase earthing and lost territory or open-phase operation power-frequency overvoltage of transformer neutral point insulation when system, and
And the voltage signal of bus-bar potential transformer measurement is controlled controllable quick using controller when meeting preset switch motion threshold value
Earthing switch closure carries out reliably protecting to transformer neutral point insulation and arrester.
Preferably, it wherein described control controllable high speed grounding switch closure using controller, insulate to transformer neutral point
Reliably protecting is carried out with arrester, comprising: detects bus three-phase voltage using detection module；Using low-pass filtering module to monitoring
Bus three-phase voltage be filtered；The bus three-phase voltage by filtering processing is carried out using virtual value computing module
Virtual value calculates, and obtains voltage effective value；It is default to judge whether the voltage effective value is more than or equal to using Logic control module
Switch motion threshold value send order of closing a floodgate to opening if the voltage effective value is more than or equal to preset switch motion threshold value
Close control module, control the controllable high speed grounding switch and carry out feed motion, to transformer neutral point insulation and arrester into
Row reliably protecting.
Preferably, wherein for 110kV transformer neutral point, the controllable high speed grounding switch at least uses 72.5kV electric
Press grade；For 220kV transformer neutral point, the controllable high speed grounding switch at least uses 126kV voltage class.
Preferably, in step 402 under thunder and lightning and switching overvoltage, arrester is acted with limiting transformer neutral point
Overvoltage, protection transformer neutral point insulation.
Preferably, wherein for 110kV transformer neutral point, the voltage rating of arrester is 60kV, continuous running voltage
For 48kV, nominal discharge current 1.5kA；Or the voltage rating of arrester is 72kV, continuous running voltage 58kV is nominally put
Electric current 1.5kA；For 220kV transformer neutral point, the voltage rating of arrester is 146kV；Continuous running voltage is
116kV, nominal discharge current 1.5kA.
Preferably, wherein the bushing is porcelain, SF is filled in closed bushing6、N2And environmental type
The insulating gas of gas mixing.
110kV the and 220kV transformer neutral point guard method 400 of the embodiment of the present invention and another reality of the invention
The corresponding with the closed intelligent protection device 200 of 110kV and 220kV transformer neutral point of example is applied, details are not described herein.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (10)
1. a kind of closed intelligent protection device of 110kV and 220kV transformer neutral point, which is characterized in that described device includes:
Controller and controllable high speed grounding switch and the arrester being closed in bushing, pass through the controllable high speed grounding switch
It is used in combination with arrester, synthesis is controlled to protect to transformer neutral point；
The controller, the single-phase earthing and lost territory or open-phase operation work for threatening transformer neutral point to insulate for system generation
Frequency overvoltage, and the voltage signal of bus-bar potential transformer measurement is when meeting preset switch motion threshold value, it can described in control
High speed grounding switch closure is controlled, reliably protecting is carried out to transformer neutral point insulation and arrester；
The arrester, under thunder and lightning and switching overvoltage, being acted with limiting transformer neutral point overvoltage, protection
Transformer neutral point insulation.
2. the apparatus according to claim 1, which is characterized in that
For 110kV transformer neutral point, the controllable high speed grounding switch at least uses 72.5kV voltage class；
For 220kV transformer neutral point, the controllable high speed grounding switch at least uses 126kV voltage class.
3. the apparatus according to claim 1, which is characterized in that the controller includes:
Detection module, for detecting bus three-phase voltage；
Low-pass filtering module, for being filtered to the bus three-phase voltage of monitoring；
Virtual value computing module, for carrying out virtual value calculating to the bus three-phase voltage by filtering processing, obtaining voltage has
Valid value；
Logic control module, for judging whether the voltage effective value is more than or equal to preset switch motion threshold value, if described
When voltage effective value is more than or equal to preset switch motion threshold value, order of closing a floodgate is sent to switch control module, it can described in control
It controls high speed grounding switch and carries out feed motion；Conversely, sending separating brake order to switch control module, the controllable fast quick access is controlled
Ground switch carries out separating brake movement.
4. the apparatus according to claim 1, which is characterized in that the bushing is porcelain, in closed bushing
Filled with SF6、N2With the insulating gas of environmental type gas mixing.
5. the apparatus according to claim 1, which is characterized in that
For 110kV transformer neutral point, the voltage rating of arrester is 60kV, continuous running voltage 48kV, nominal discharge
Electric current 1.5kA；Or the voltage rating of arrester is 72kV, continuous running voltage 58kV, nominal discharge current 1.5kA；
For 220kV transformer neutral point, the voltage rating of arrester is 146kV；Continuous running voltage is 116kV, is nominally put
Electric current 1.5kA.
6. a kind of carry out guard method to 110kV and 220kV transformer neutral point using device as described in claim 1,
It is characterized in that, which comprises be used in combination by controllable high speed grounding switch and arrester, synthesis is controlled to change
Depressor neutral point is protected, wherein
When the single-phase earthing and lost territory or open-phase operation power-frequency overvoltage of transformer neutral point insulation occur to threaten for system, and
When the voltage signal of bus-bar potential transformer measurement meets preset switch motion threshold value, controllable fast quick access is controlled using controller
Ground closes the switch, and carries out reliably protecting to transformer neutral point insulation and arrester；
Under thunder and lightning and switching overvoltage, arrester is acted with limiting transformer neutral point overvoltage, is protected in transformer
Property point insulating.
7. the method according to claim 1, wherein
For 110kV transformer neutral point, the controllable high speed grounding switch at least uses 72.5kV voltage class；
For 220kV transformer neutral point, the controllable high speed grounding switch at least uses 126kV voltage class.
8. the method according to claim 1, wherein described closed using the controllable high speed grounding switch of controller control
It closes, reliably protecting is carried out to transformer neutral point insulation and arrester, comprising:
Bus three-phase voltage is detected using detection module；
It is filtered using bus three-phase voltage of the low-pass filtering module to monitoring；
Virtual value calculating is carried out to the bus three-phase voltage by filtering processing using virtual value computing module, it is effective to obtain voltage
Value；
Judge whether the voltage effective value is more than or equal to preset switch motion threshold value using Logic control module, if the electricity
When being pressed with valid value more than or equal to preset switch motion threshold value, order of closing a floodgate is sent to switch control module, is controlled described controllable
High speed grounding switch carries out feed motion, carries out reliably protecting to transformer neutral point insulation and arrester.
9. the method according to claim 1, wherein the bushing is porcelain, in closed bushing
Filled with SF6、N2With the insulating gas of environmental type gas mixing.
10. the method according to claim 1, wherein
For 110kV transformer neutral point, the voltage rating of arrester is 60kV, continuous running voltage 48kV, nominal discharge
Electric current 1.5kA；Or the voltage rating of arrester is 72kV, continuous running voltage 58kV, nominal discharge current 1.5kA；
For 220kV transformer neutral point, the voltage rating of arrester is 146kV；Continuous running voltage is 116kV, is nominally put
Electric current 1.5kA.
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| CN201811184015.2A CN109217250A (en) | 2018-10-11 | 2018-10-11 | A kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811184015.2A CN109217250A (en) | 2018-10-11 | 2018-10-11 | A kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030049A (en) * | 2019-11-19 | 2020-04-17 | 深圳供电局有限公司 | Transformer neutral point protection method and device |
| CN114498304A (en) * | 2021-11-30 | 2022-05-13 | 河北择东电气有限公司 | Intelligent protection equipment and protection method for controllable gap of transformer neutral point mechanism |
| CN116544046A (en) * | 2023-07-05 | 2023-08-04 | 江苏安靠智能输电工程科技股份有限公司 | Gas-insulated neutral point grounding switch of transformer |
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| CN114498304A (en) * | 2021-11-30 | 2022-05-13 | 河北择东电气有限公司 | Intelligent protection equipment and protection method for controllable gap of transformer neutral point mechanism |
| CN116544046A (en) * | 2023-07-05 | 2023-08-04 | 江苏安靠智能输电工程科技股份有限公司 | Gas-insulated neutral point grounding switch of transformer |
| CN116544046B (en) * | 2023-07-05 | 2023-10-03 | 江苏安靠智能输电工程科技股份有限公司 | Gas-insulated neutral point grounding switch of transformer |
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