CN106410748A - Transformer neutral point protection device - Google Patents
Transformer neutral point protection device Download PDFInfo
- Publication number
- CN106410748A CN106410748A CN201610867813.XA CN201610867813A CN106410748A CN 106410748 A CN106410748 A CN 106410748A CN 201610867813 A CN201610867813 A CN 201610867813A CN 106410748 A CN106410748 A CN 106410748A
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- China
- Prior art keywords
- neutral point
- transformer neutral
- transformer
- gap
- ball discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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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
- 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
- 230000005684 electric field Effects 0.000 claims description 3
- 230000001960 triggered effect 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
- 230000000694 effects Effects 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 description 8
- 230000007257 malfunction Effects 0.000 description 4
- 230000009466 transformation 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
- 238000005516 engineering process Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000002085 persistent effect 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
- 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
- 238000000034 method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a transformer neutral point protection device, which comprises: 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 transformer neutral point protection device can ensure that the transformer neutral point protection gap can reliably act when power frequency overvoltage occurs and does not act when lightning overvoltage and operation overvoltage occur so as to protect the transformer neutral point insulation and ensure that the lightning arrester cannot explode due to overlong current passing time; reasonable structure, safety, high efficiency and reliability.
Description
Technical field
The present invention relates 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 runs.
At present, the harm that lightning surge and the higher power-frequency overvoltage of amplitude insulate to transformer neutral point is larger, 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
Lifting, the reliability of impact 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 to bear for a long time
Power-frequency overvoltage, insulation safety is on the hazard.
Content of the invention
The technical problem to be solved is, provides a kind of transformer neutral point protection device, can make transformation
Device protective gap of neutral point action message when there is power-frequency overvoltage, motionless when there is lightning surge and switching overvoltage
Make, to protect transformer neutral point insulation it is ensured that spark gap will not be due to long and explode by current time；Structure is closed
Reason, safe and efficient reliability.
In order to solve above-mentioned technical problem, The embodiment provides a kind of transformer neutral point protection device, bag
Include：Metal oxide arrester；In parallel with metal oxide arrester in order to the ball electrode being triggered by spark discharge
Protection device, ball electrode protecting device at least includes：First ball discharge gap, the second ball discharge gap and in order in pulse high-voltage
In the presence of electric discharge produce pyrophoric trigger electrode, wherein：Act on the pulse high-voltage on trigger electrode make trigger electrode with
Discharge between the first ball discharge gap or the second ball discharge gap and produce spark, make between the first ball discharge gap and the second ball discharge gap
Sphere gap between breakdown voltage reduction and/or the first ball discharge gap and the second ball discharge gap punctures.
Wherein, transformer neutral point protection device also includes：In parallel with metal oxide arrester in order 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 second capacitive divider that one capacitive divider is connected, wherein：The power-frequency overvoltage of transformer neutral point is divided by capacitive divider
Power-frequency voltage, power-frequency voltage and transformer neutral point have been got after pressure on the first capacitive divider or the second capacitive divider
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；Be connected to the damping resistance on isolating transformer, and respectively with isolating transformer, damping resistance and gold
Belong to the full-wave rectification bridge that Oxide Arrester is connected, wherein：Power-frequency voltage enters all-wave through damping resistance again through isolating transformer
After rectifier bridge, rectification 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
Rush transformator, wherein：DC voltage charges to energy-storage capacitor, triggers two poles when the charging voltage of energy-storage capacitor exceedes high pressure
During the specified trigger voltage of pipe, high pressure diac triggers.
Wherein, after the triggering through high pressure diac for the energy-storage capacitor, the former limit of pulse transformer is discharged, and pulse becomes
Depressor produces the pulse high-voltage acting on trigger electrode in its secondary.
Wherein, transformer neutral point protection device also includes：It is connected in parallel on the discharge resistance on energy-storage capacitor.
Wherein, metal oxide arrester is Zinc-Oxide Arrester.
Wherein, between trigger electrode and the first ball discharge gap or the second ball discharge gap, electric discharge produces spark can be the first ball discharge
Electric field between gap and the second ball discharge gap provides a large amount of charged particles.
Implement the transformer neutral point protection device of the present invention, there is following beneficial effect：
Firstth, acting on the pulse high-voltage on trigger electrode makes between trigger electrode and the first ball discharge gap or the second ball discharge gap
Discharge and produce spark, so that the breakdown voltage between the first ball discharge gap and the second ball discharge gap is reduced and/or the first ball discharge
Sphere gap between gap and the second ball discharge gap punctures, and transformer neutral point protective gap can be made to occur power frequency excessively electric
Action message during pressure, there is lightning surge and be failure to actuate during switching overvoltage, protecting transformer neutral point insulation it is ensured that
Spark gap will not be due to long and explode by current time；Reduce the dispersibility of portable protective gaps action, preferably with
Metal oxide arrester coordinates, and improves stability and the Reliability of Microprocessor of device.
Secondth, rational in infrastructure, safe and efficient reliability, can preferably ensure the stability of electrical network.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the electrical block diagram of embodiment of the present invention transformer neutral point protection device.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
As shown in figure 1, the embodiment one for transformer neutral point protection device of the present invention.
Embodiments provide a kind of transformer neutral point protection device, including：Metal oxide arrester and ball
Electrode protecting device.
Metal oxide arrester in the present embodiment is Zinc-Oxide Arrester MOA.
Ball electrode protecting device with metal oxide arrester MOA and couples, and its effect is to be touched by spark discharge
Send out, play the effect of igniting, electronics causes puncturing of whole gas gap produced by the spark discharge of this local.
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 electric discharge in the presence of pulse high-voltage, wherein：The pulse acting 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
Sphere gap between low and/or the first ball discharge gap G1 and the second ball discharge gap G2 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：In parallel with metal oxide arrester MOA in order 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
The second capacitive divider C2 be connected in the first capacitive divider C1 and 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, this power frequency electric
Pressure is proportional to the power-frequency overvoltage of transformer neutral point.
It is understood that being divided by capacitive divider using arrangement demand or power-frequency overvoltage according to actual
Power-frequency voltage has been got on the first capacitive divider C1, this power-frequency voltage is become with the power-frequency overvoltage of transformer neutral point after pressure
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；Be connected to the damping resistance R1 on isolating transformer T1, and respectively with isolation transformation
The full-wave rectification bridge D1 that device T1, damping resistance R1 are connected with metal oxide arrester MOA, wherein：Power-frequency voltage becomes through isolation
It is DC voltage that depressor T1 enters rectification after full-wave rectification bridge D1 again through damping resistance R1.
Further, transformer neutral point protection device also includes：Keep away with full-wave rectification bridge D1 and metal-oxide respectively
The energy-storage capacitor C that thunder device MOA is connected；The high pressure diac D2 being connected with energy-storage capacitor C；And trigger two with high pressure
The pulse transformer T2 that pole pipe D2 is connected, 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 triggers.
Wherein, after the triggering through high pressure diac D2 for the energy-storage capacitor C, the former limit of pulse transformer T2 is discharged, arteries and veins
Rush transformator T2 and produce the pulse high-voltage acting on trigger electrode J in its secondary.
Further, transformer neutral point protection device also includes：It is connected in parallel on the discharge resistance R2 on energy-storage capacitor C.
A kind of transformer neutral point protection device of the embodiment of the present invention in the specific implementation, is needing the first ball discharge gap
During sphere gap action between G1 and the second ball discharge gap G2, introduce the spark discharge of a local, play ignition action, by local fire
Electronics produced by flower electric discharge causes puncturing of whole gas gap.
Specifically, the power-frequency overvoltage of transformer neutral point is divided by the first capacitive divider C1 and the second capacitive divider C2
Power-frequency voltage has been got on the second capacitive divider C2, this power-frequency voltage becomes ratio with transformer neutral point power-frequency overvoltage after pressure
Example, it is DC voltage that this power-frequency voltage enters full-wave rectification bridge D1 rectification through overdamp resistance R1 after isolating transformer T1, 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 touches
Send out, energy-storage capacitor C discharges through high pressure diac D2 pulse transformer T2 former limit, produce the high electricity of pulse in its secondary
Pressure, this pulse high-voltage acts on trigger electrode J, at this moment discharges between trigger electrode J and the second ball discharge gap G2 and produce spark,
Both ignition results had been produced, this 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 sphere gap between the first ball discharge gap G1 and the second ball discharge gap G2 substantially reduces, finally makes first
Sphere gap between ball discharge gap G1 and the second ball discharge gap G2 punctures.
Because the presence of damping resistance R1 is so that in lightning impulse voltage, the persistent period such as operating impulse voltage is shorter
The lower energy-storage capacitor of transient overvoltage effect can not store enough energy, thus igniting trigger pulse electricity also would not be produced
Pressure, so, under persistent period shorter transient overvoltage, the breakdown voltage of sphere gap will be very high, and igniting will not be occurred to touch
Provide electricity, and malfunction will not occur under residual voltage of arrester.
In the other embodiment of transformer neutral point protection device of the present invention, the first ball discharge gap G1 and the second ball discharge
The parameter of the ball electrode length between gap G2 and internal control circuit can be carried out adjusting, can be according to transformation in actual moving process
The overvoltage level that device neutral point occurs, to determine size and the parameter of spark triggered gap each several part, to reach and avoid spark gap
With the purpose of gap malfunction and tripping, protect transformer neutral point insulation, improve grid stability.
Implement the transformer neutral point protection device of the present invention, there is following beneficial effect：
Firstth, acting on the pulse high-voltage on trigger electrode makes between trigger electrode and the first ball discharge gap or the second ball discharge gap
Discharge and produce spark, so that the breakdown voltage between the first ball discharge gap and the second ball discharge gap is reduced and/or the first ball discharge
Sphere gap between gap and the second ball discharge gap punctures, and transformer neutral point protective gap can be made to occur power frequency excessively electric
Action message during pressure, there is lightning surge and be failure to actuate during switching overvoltage, protecting transformer neutral point insulation it is ensured that
Spark gap will not be due to long and explode by current time；Reduce the dispersibility of portable protective gaps action, preferably with
Metal oxide arrester coordinates, and improves stability and the 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 is it is characterised in that include：
Metal oxide arrester；
In parallel with described metal oxide arrester in order to the ball electrode protecting device being triggered by spark discharge, described
Ball electrode protecting device at least includes：First ball discharge gap, the second ball discharge gap and in order in the presence of pulse high-voltage
Pyrophoric trigger electrode is produced in electric discharge, wherein：
Acting on the pulse high-voltage on described trigger electrode makes described trigger electrode and described first ball discharge gap or described the
Discharge between two ball discharge gaps and produce spark, make the breakdown voltage between described first ball discharge gap and described second ball discharge gap
Sphere gap between reduction and/or described first ball discharge gap and described second ball discharge gap punctures.
2. transformer neutral point protection device as claimed in claim 1 is it is characterised in that the protection of described transformer neutral point fills
Put and also include：
The electric capacity in order to the power-frequency overvoltage of transformer neutral point is carried out with partial pressure in parallel with described metal oxide arrester
Potentiometer, described capacitive divider at least includes the first capacitive divider and the second electricity being connected with described first capacitive divider
Hold potentiometer, wherein：The power-frequency overvoltage of transformer neutral point is divided in described first electric capacity by after described capacitive divider partial pressure
Power-frequency voltage has been got, described power-frequency voltage is excessively electric with the power frequency of transformer neutral point on depressor or described second capacitive divider
It is pressed into ratio.
3. transformer neutral point protection device as claimed in claim 2 is it is characterised in that the protection of described transformer neutral point fills
Put and also include：
It is connected in parallel on the isolating transformer on described first capacitive divider or described second capacitive divider；
It is connected to the damping resistance on described isolating transformer, and
The full-wave rectification bridge being connected with described isolating transformer, described damping resistance and described metal oxide arrester respectively,
Wherein：
It is straight that described power-frequency voltage enters rectification after described full-wave rectification bridge again through described isolating transformer through described damping resistance
Stream voltage.
4. transformer neutral point protection device as claimed in claim 3 is it is characterised in that the protection of described transformer neutral point fills
Put and also include：
The energy-storage capacitor being connected with described full-wave rectification bridge and described metal oxide arrester respectively；
The high pressure diac being connected with described energy-storage capacitor；And
The pulse transformer being connected with described high pressure diac, wherein：Described DC voltage fills to described energy-storage capacitor
Electricity, when the charging voltage of described energy-storage capacitor exceedes the specified trigger voltage of described high pressure diac, described high pressure
Diac triggers.
5. transformer neutral point protection device as claimed in claim 4 is it is characterised in that described energy-storage capacitor is through described height
Former limit electric discharge to described pulse transformer after the triggering of pressure diac, described pulse transformer acts in its secondary generation
Described pulse high-voltage in described trigger electrode.
6. the transformer neutral point protection device as described in claim 4 or 5 is it is characterised in that described transformer neutral point is protected
Protection unit also includes：It is connected in parallel on the discharge resistance on described energy-storage capacitor.
7. transformer neutral point protection device as claimed in claim 1 is it is characterised in that described metal oxide arrester is
Zinc-Oxide Arrester.
8. transformer neutral point protection device as claimed in claim 1 is it is characterised in that described trigger electrode and described first
Between ball discharge gap or described second ball discharge gap, electric discharge produces spark can be described first ball discharge gap and described second ball discharge
Electric field between gap provides a large amount of charged particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610867813.XA CN106410748A (en) | 2016-09-30 | 2016-09-30 | Transformer neutral point protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610867813.XA CN106410748A (en) | 2016-09-30 | 2016-09-30 | Transformer neutral point protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106410748A true CN106410748A (en) | 2017-02-15 |
Family
ID=59229177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610867813.XA Pending CN106410748A (en) | 2016-09-30 | 2016-09-30 | Transformer neutral point protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106410748A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117745A (en) * | 2019-06-20 | 2020-12-22 | 王嬿蕾 | Dynamic insulation matching method and device for eliminating power frequency insulation strength loss |
| EP3747100B1 (en) * | 2018-01-30 | 2022-03-16 | Hitachi Energy Switzerland AG | Surge arrestor dimensioning in a dc power transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1933268A (en) * | 2006-09-06 | 2007-03-21 | 中国电力科学研究院 | Controllable gap for protecting transformer neutral point |
| CN202997557U (en) * | 2012-12-26 | 2013-06-12 | 宁夏电力公司吴忠供电局 | Controllable trigger device for protecting 110kV transformer neutral point |
| CN103269058A (en) * | 2013-06-13 | 2013-08-28 | 哈尔滨理工大学 | Controllable gap, and device and method for protecting neutral point of 110KV transformer based on controllable gap |
| US20140334054A1 (en) * | 2013-02-20 | 2014-11-13 | Emprimus, Llc | Overvoltage protection for power systems |
| CN206117123U (en) * | 2016-09-30 | 2017-04-19 | 深圳供电局有限公司 | Transformer neutral point protection device |
-
2016
- 2016-09-30 CN CN201610867813.XA patent/CN106410748A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1933268A (en) * | 2006-09-06 | 2007-03-21 | 中国电力科学研究院 | Controllable gap for protecting transformer neutral point |
| CN202997557U (en) * | 2012-12-26 | 2013-06-12 | 宁夏电力公司吴忠供电局 | Controllable trigger device for protecting 110kV transformer neutral point |
| US20140334054A1 (en) * | 2013-02-20 | 2014-11-13 | Emprimus, Llc | Overvoltage protection for power systems |
| CN103269058A (en) * | 2013-06-13 | 2013-08-28 | 哈尔滨理工大学 | Controllable gap, and device and method for protecting neutral point of 110KV transformer based on controllable gap |
| CN206117123U (en) * | 2016-09-30 | 2017-04-19 | 深圳供电局有限公司 | Transformer neutral point protection device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3747100B1 (en) * | 2018-01-30 | 2022-03-16 | Hitachi Energy Switzerland AG | Surge arrestor dimensioning in a dc power transmission system |
| CN112117745A (en) * | 2019-06-20 | 2020-12-22 | 王嬿蕾 | Dynamic insulation matching method and device for eliminating power frequency insulation strength loss |
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Application publication date: 20170215 |
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