CN206117123U - Transformer neutral point protection device - Google Patents
Transformer neutral point protection device Download PDFInfo
- Publication number
- CN206117123U CN206117123U CN201621096100.XU CN201621096100U CN206117123U CN 206117123 U CN206117123 U CN 206117123U CN 201621096100 U CN201621096100 U CN 201621096100U CN 206117123 U CN206117123 U CN 206117123U
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- Prior art keywords
- neutral point
- transformer neutral
- transformer
- voltage
- ball discharge
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 61
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 20
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 20
- 230000015556 catabolic process Effects 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000004146 energy storage Methods 0.000 claims description 22
- 238000013016 damping Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 5
- 230000005684 electric field Effects 0.000 claims description 3
- 229960001296 zinc oxide Drugs 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 description 8
- 230000007257 malfunction Effects 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 3
- 210000001367 artery Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a transformer neutral point protection device, include: metal oxide arrester and ball electrode protection device, ball electrode protection device includes at least: first discharge ball gap, second discharge ball gap and be used for discharging under the effect of pulse high voltage and produce the trigger electrode of spark, wherein: the high voltage of the pulse acting on the trigger electrode discharges the trigger electrode and the first discharge ball gap or the second discharge ball gap and generates a spark, so that the breakdown voltage between the first discharge ball gap and the second discharge ball gap is reduced and/or the ball gap between the first discharge ball gap and the second discharge ball gap is broken down. The utility model discloses a transformer neutral point protection device can make the reliable action of transformer neutral point protection clearance when taking place the power frequency overvoltage, does not move when taking place thunder and lightning overvoltage and operation overvoltage to protect transformer neutral point insulation, ensure that the arrester can not explode because of passing through the electric current overlength; reasonable structure, safety, high efficiency and reliability.
Description
Technical field
This utility model is related to power transformation engineering field, more particularly to a kind of transformer neutral point protection device.
Background technology
In prior art, 110,220 KV transformer substation systems by the way of neutral point effective grounding, in order to limit single-phase connecing
Ground short circuit electric current, prevents communication interference and relay protection configured in one piece etc. from requiring, some transformers neutral point is usually taken and does not connect
Ground operation.
At present, the higher power-frequency overvoltage of lightning surge and amplitude is larger to harm that transformer neutral point insulate, existing
Some transformer neutral point protection devices generally adopt power frequency gap protection, lightning surge, switching overvoltage protection of arrester
Scheme.But, from the point of view of current ruuning situation, portable protective gaps acting characteristic dispersibility is very big, the probability of malfunction has occurred
Lifted, affect the reliability of operation of power networks, for example：Portable protective gaps malfunction under transient overvoltage causes zero-sequenceprotection action to jump master
Transformator, portable protective gaps tripping under power-frequency overvoltage causes Explosion of on Arrester, and causes transformer neutral point long-time to bear
Power-frequency overvoltage, insulation safety is on the hazard.
Utility model content
Technical problem to be solved in the utility model is, there is provided a kind of transformer neutral point protection device, can make
Transformer neutral point protective gap action message when there is power-frequency overvoltage, when there is lightning surge and switching overvoltage
It is failure to actuate, to protect transformer neutral point to insulate, it is ensured that spark gap will not be due to long by current time and explode；Knot
Structure is reasonable, safe and efficient reliability.
In order to solve above-mentioned technical problem, embodiment of the present utility model provides a kind of transformer neutral point protection dress
Put, including：Metal oxide arrester；The ball to be triggered by spark discharge in parallel with metal oxide arrester
Electrode protecting device, ball electrode protecting device at least includes：First ball discharge gap, the second ball discharge gap and to high in pulse
Pyrophoric trigger electrode is produced in electric discharge in the presence of voltage, wherein：Acting on the pulse high-voltage on trigger electrode makes triggering electricity
Discharge between pole and the first ball discharge gap or the second ball discharge gap and produce spark, make the first ball discharge gap and the second ball discharge gap it
Between breakdown voltage reduce and/or the sphere gap between the first ball discharge gap and the second ball discharge gap puncture.
Wherein, transformer neutral point protection device also includes：It is in parallel with metal oxide arrester to transformator
The power-frequency overvoltage of neutral point carries out the capacitive divider of partial pressure, and capacitive divider at least includes the first capacitive divider and with the
The second connected capacitive divider of one capacitive divider, wherein：The power-frequency overvoltage of transformer neutral point is by capacitive divider point
Power-frequency voltage, power-frequency voltage and transformer neutral point are got on the first capacitive divider or the second capacitive divider after pressure
Power-frequency overvoltage is proportional.
Wherein, transformer neutral point protection device also includes：It is connected in parallel on the first capacitive divider or the second capacitive divider
On isolating transformer；The damping resistance being connected on isolating transformer, and respectively with isolating transformer, damping resistance and gold
The connected full-wave rectification bridge of category Oxide Arrester, wherein：Again Jing damping resistances enter all-wave to power-frequency voltage Jing isolating transformers
Rectification after rectifier bridge is DC voltage.
Wherein, transformer neutral point protection device also includes：Respectively with full-wave rectification bridge and metal oxide arrester phase
Energy-storage capacitor even；The high pressure diac being connected with energy-storage capacitor；And the arteries and veins being connected with high pressure diac
Transformator is rushed, wherein：DC voltage charges to energy-storage capacitor, and when the charging voltage of energy-storage capacitor exceedes high pressure two poles are triggered
During the specified trigger voltage of pipe, the triggering of high pressure diac.
Wherein, the former limit electric discharge of energy-storage capacitor pulse transformer Jing after the triggering of high pressure diac, pulse becomes
Depressor produces the pulse high-voltage for acting on trigger electrode in its secondary.
Wherein, transformer neutral point protection device also includes：The discharge resistance being connected in parallel on energy-storage capacitor.
Wherein, metal oxide arrester is Zinc-Oxide Arrester.
Wherein, it can be the first ball discharge that electric discharge produces spark between trigger electrode and the first ball discharge gap or the second ball discharge gap
Electric field between gap and the second ball discharge gap provides a large amount of charged particles.
Implement transformer neutral point protection device of the present utility model, with following beneficial effect：
Firstth, acting on the pulse high-voltage on trigger electrode makes trigger electrode and the first ball discharge gap or the second ball discharge
Spark is discharged and produced between gap, makes that breakdown voltage between the first ball discharge gap and the second ball discharge gap is reduced and/or first puts
Sphere gap between electric ball gap and the second ball discharge gap punctures, and can make transformer neutral point protective gap that power frequency is occurring
Action message during overvoltage, is failure to actuate when there is lightning surge and switching overvoltage, to protect transformer neutral point to insulate,
Guarantee that spark gap will not be due to long by current time and explode；The dispersibility of portable protective gaps action is reduced, more preferably
With metal oxide arrester coordinate, improve the stability and Reliability of Microprocessor of device.
Secondth, rational in infrastructure, safe and efficient reliability can preferably ensure the stability of electrical network.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, in the premise for not paying creative work
Under, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the electrical block diagram of this utility model embodiment transformer neutral point protection device.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of this utility model protection.
As shown in figure 1, for the embodiment one of this utility model transformer neutral point protection device.
This utility model embodiment provides a kind of transformer neutral point protection device, including：Metal oxide arrester
With ball electrode protecting device.
Metal oxide arrester in the present embodiment is Zinc-Oxide Arrester MOA.
Ball electrode protecting device is with metal oxide arrester MOA and couples, and its effect is touched by spark discharge
Send out, play a part of igniting, the electronics by produced by the spark discharge of this local causes puncturing for whole gas gap.
When being embodied as, ball electrode protecting device at least includes：First ball discharge gap G1, the second ball discharge gap G2 and use
Pyrophoric trigger electrode J is produced with the electric discharge in the presence of pulse high-voltage, wherein：The pulse acted on trigger electrode J is high
Voltage makes trigger electrode J and the first ball discharge gap G1 or the second ball discharge gap G2（Put with second for trigger electrode J in the present embodiment
Electric ball gap G2）Between discharge and produce spark, make the breakdown potential pressure drop between the first ball discharge gap G1 and the second ball discharge gap gap G2
Low and/or between the first ball discharge gap G1 and the second ball discharge gap G2 sphere gap punctures.
It is understood that according to actual use arrangement demand, or trigger electrode J and the first ball discharge gap G1
Between discharge and produce spark, have no effect on enforcement.
Further, transformer neutral point protection device also includes：It is in parallel with metal oxide arrester MOA to right
The power-frequency overvoltage of transformer neutral point carries out the capacitive divider of partial pressure.In the present embodiment, capacitive divider includes but does not limit
In the first capacitive divider C1 and the second capacitive divider C2 being connected with the first capacitive divider C1, wherein：Transformator is neutral
Point power-frequency overvoltage by after capacitive divider partial pressure in the first capacitive divider C1 or second capacitive divider C2 (the present embodiment
In for power-frequency overvoltage by after capacitive divider partial pressure in the second capacitive divider C2) on got power-frequency voltage, the power frequency electric
Pressure is proportional to the power-frequency overvoltage of transformer neutral point.
It is understood that according to actual use arrangement demand, or power-frequency overvoltage by capacitive divider point
Got power-frequency voltage on the first capacitive divider C1 after pressure, the power-frequency overvoltage of the power-frequency voltage and transformer neutral point into
Ratio.Have no effect on enforcement.
Further, transformer neutral point protection device also includes：It is connected in parallel on the first capacitive divider C1 or the second electric capacity
Isolating transformer T1 on potentiometer C2；The damping resistance R1 being connected on isolating transformer T1, and respectively with isolate transformation
The full-wave rectification bridge D1 that device T1, damping resistance R1 are connected with metal oxide arrester MOA, wherein：Power-frequency voltage Jing isolation becomes
Again rectification is DC voltage to depressor T1 Jing after damping resistance R1 enters full-wave rectification bridge D1.
Further, transformer neutral point protection device also includes：Keep away with metal-oxide with full-wave rectification bridge D1 respectively
Thunder device MOA connected energy-storage capacitor C；The high pressure diac D2 being connected with energy-storage capacitor C；And trigger two with high pressure
The connected pulse transformer T2 of pole pipe D2, wherein：DC voltage charges to energy-storage capacitor C, when the charging electricity of energy-storage capacitor C
When pressure exceedes the specified trigger voltage of high pressure diac D2, high pressure diac D2 triggerings.
Wherein, the former limit electric discharge of energy-storage capacitor C pulse transformers T2 Jing after the triggering of high pressure diac D2, arteries and veins
Rush transformator T2 and the pulse high-voltage for acting on trigger electrode J is produced in its secondary.
Further, transformer neutral point protection device also includes：The discharge resistance R2 being connected in parallel on energy-storage capacitor C.
A kind of transformer neutral point protection device of this utility model embodiment in the specific implementation, is discharged needing first
During sphere gap action between ball gap G1 and the second ball discharge gap G2, the spark discharge of a local is introduced, ignition action is played, by office
Electronics produced by portion's spark discharge causes puncturing for whole gas gap.
Specifically, the power-frequency overvoltage of transformer neutral point is by the first capacitive divider C1 and the second capacitive divider C2 point
Got power-frequency voltage on the second capacitive divider C2 after pressure, this power-frequency voltage and transformer neutral point power-frequency overvoltage into than
Example, it is DC voltage that this power-frequency voltage Jing overdamps resistance R1 Jing after isolating transformer T1 enters full-wave rectification bridge D1 rectifications, should
DC voltage charges to energy-storage capacitor C, touches when the charging voltage of energy-storage capacitor C exceedes the specified of high pressure diac D2
During the pressure that generates electricity, wherein：The threshold value that the specified trigger voltage of high pressure diac D2 is previously set, high pressure diac D2 is touched
Send out, energy-storage capacitor C discharges through high pressure diac D2 pulse transformers T2 former limit, in its secondary the high electricity of pulse is produced
Pressure, the pulse high-voltage acts on trigger electrode J, spark is at this moment discharged and produced between trigger electrode J and the second ball discharge gap G2,
Both ignition results had been produced, the electric discharge provides a large amount of band electrochondrias for the electric field between the first ball discharge gap G1 and the second ball discharge gap G2
Son so that the breakdown voltage of the sphere gap between the first ball discharge gap G1 and the second ball discharge gap G2 is substantially reduced, and finally makes first
Sphere gap between ball discharge gap G1 and the second ball discharge gap G2 punctures.
Due to the presence of damping resistance R1 so that shorter in persistent period such as lightning impulse voltage, operating impulse voltages
The lower energy-storage capacitor of transient overvoltage effect can not store enough energy, so as to would not also produce igniting trigger pulse electricity
Pressure, so, under persistent period shorter transient overvoltage, the breakdown voltage of sphere gap will be very high, igniting will not occur and touch
Electricity is provided, and malfunction will not occur under residual voltage of arrester.
In the other embodiment of this utility model transformer neutral point protection device, the first ball discharge gap G1 and second is put
The parameter of ball electrode length and internal control circuit between electric ball gap G2 can be carried out adjusting, can be according in actual moving process
The overvoltage level that transformer neutral point occurs is reached and is avoided determining the size and parameter of spark triggered gap each several part
Thunder device and the purpose of gap malfunction and tripping, protection transformer neutral point insulation, improve grid stability.
Implement transformer neutral point protection device of the present utility model, with following beneficial effect：
Firstth, acting on the pulse high-voltage on trigger electrode makes trigger electrode and the first ball discharge gap or the second ball discharge
Spark is discharged and produced between gap, makes that breakdown voltage between the first ball discharge gap and the second ball discharge gap is reduced and/or first puts
Sphere gap between electric ball gap and the second ball discharge gap punctures, and can make transformer neutral point protective gap that power frequency is occurring
Action message during overvoltage, is failure to actuate when there is lightning surge and switching overvoltage, to protect transformer neutral point to insulate,
Guarantee that spark gap will not be due to long by current time and explode；The dispersibility of portable protective gaps action is reduced, more preferably
With metal oxide arrester coordinate, improve the stability and Reliability of Microprocessor of device.
Secondth, rational in infrastructure, safe and efficient reliability can preferably ensure the stability of electrical network.
Claims (8)
1. a kind of transformer neutral point protection device, it is characterised in that include：
Metal oxide arrester；
The ball electrode protecting device to be triggered by spark discharge in parallel with the metal oxide arrester, it is described
Ball electrode protecting device at least includes：First ball discharge gap, the second ball discharge gap and in the presence of pulse high-voltage
Pyrophoric trigger electrode is produced in electric discharge, wherein：
Acting on the pulse high-voltage on the trigger electrode makes the trigger electrode with the first ball discharge gap or described
Discharge between two ball discharge gaps and produce spark, make the breakdown voltage between the first ball discharge gap and the second ball discharge gap
Reduce and/or the sphere gap between the first ball discharge gap and the second ball discharge gap punctures.
2. transformer neutral point protection device as claimed in claim 1, it is characterised in that the transformer neutral point protection dress
Putting also includes：
The electric capacity that to power-frequency overvoltage to transformer neutral point carries out partial pressure in parallel with the metal oxide arrester
Potentiometer, the capacitive divider at least include the first capacitive divider and be connected with first capacitive divider it is second electric
Hold potentiometer, wherein：The power-frequency overvoltage of transformer neutral point is divided by after the capacitive divider partial pressure in first electric capacity
Power-frequency voltage is got on depressor or second capacitive divider, the power-frequency voltage is excessively electric with the power frequency of transformer neutral point
It is pressed into ratio.
3. transformer neutral point protection device as claimed in claim 2, it is characterised in that the transformer neutral point protection dress
Putting also includes：
Isolating transformer on being connected in parallel on first capacitive divider or second capacitive divider；
The damping resistance being connected on the isolating transformer, and
The full-wave rectification bridge being connected with the isolating transformer, the damping resistance and the metal oxide arrester respectively,
Wherein：
The power-frequency voltage described in isolating transformer again described in damping resistance enter the full-wave rectification bridge after rectification be straight
Stream voltage.
4. transformer neutral point protection device as claimed in claim 3, it is characterised in that the transformer neutral point protection dress
Putting also includes：
The energy-storage capacitor being connected with the full-wave rectification bridge and the metal oxide arrester respectively；
The high pressure diac being connected with the energy-storage capacitor；And
The pulse transformer being connected with the high pressure diac, wherein：The DC voltage fills to the energy-storage capacitor
Electricity, when the charging voltage of the energy-storage capacitor exceedes the specified trigger voltage of the high pressure diac, the high pressure
Diac is triggered.
5. transformer neutral point protection device as claimed in claim 4, it is characterised in that high described in the energy-storage capacitor Jing
The former limit of the pulse transformer is discharged after the triggering of pressure diac, the pulse transformer is in its secondary generation effect
In the pulse high-voltage of the trigger electrode.
6. the transformer neutral point protection device as described in claim 4 or 5, it is characterised in that the transformer neutral point is protected
Protection unit also includes：The discharge resistance being connected in parallel on the energy-storage capacitor.
7. transformer neutral point protection device as claimed in claim 1, it is characterised in that the metal oxide arrester is
Zinc-Oxide Arrester.
8. transformer neutral point protection device as claimed in claim 1, it is characterised in that the trigger electrode and described first
It can be the first ball discharge gap and second ball discharge that electric discharge produces spark between ball discharge gap or the second ball discharge gap
Electric field between gap provides a large amount of charged particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621096100.XU CN206117123U (en) | 2016-09-30 | 2016-09-30 | Transformer neutral point protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621096100.XU CN206117123U (en) | 2016-09-30 | 2016-09-30 | Transformer neutral point protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206117123U true CN206117123U (en) | 2017-04-19 |
Family
ID=58521392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621096100.XU Active CN206117123U (en) | 2016-09-30 | 2016-09-30 | Transformer neutral point protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206117123U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410748A (en) * | 2016-09-30 | 2017-02-15 | 深圳供电局有限公司 | Transformer neutral point protection device |
| CN108254711A (en) * | 2018-03-08 | 2018-07-06 | 云南电网有限责任公司电力科学研究院 | A kind of inter space device and method that can inhibit electromagnetic potential transformer tail end voltage |
-
2016
- 2016-09-30 CN CN201621096100.XU patent/CN206117123U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410748A (en) * | 2016-09-30 | 2017-02-15 | 深圳供电局有限公司 | Transformer neutral point protection device |
| CN108254711A (en) * | 2018-03-08 | 2018-07-06 | 云南电网有限责任公司电力科学研究院 | A kind of inter space device and method that can inhibit electromagnetic potential transformer tail end voltage |
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