CN109888757A - VFTO suppression device and GIS equipment - Google Patents
VFTO suppression device and GIS equipment Download PDFInfo
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- CN109888757A CN109888757A CN201910065154.1A CN201910065154A CN109888757A CN 109888757 A CN109888757 A CN 109888757A CN 201910065154 A CN201910065154 A CN 201910065154A CN 109888757 A CN109888757 A CN 109888757A
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- 230000001629 suppression Effects 0.000 title abstract 4
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 230000007704 transition Effects 0.000 claims description 19
- 230000002829 reductive effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 description 11
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000011324 bead Substances 0.000 description 7
- 230000002401 inhibitory effect Effects 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
本发明涉及电力设备技术领域，具体提供了一种VFTO抑制装置及使用该VFTO抑制装置的GIS设备，该VFTO抑制装置包括导电杆，导电杆包括导电杆主体，所述导电杆主体沿自身轴向间隔布置，导电杆主体之间并联布置有至少两支以上的分支导电杆，各分支导电杆的外周面上均套设有磁环串组。通过在导电杆主体之间设置有多支分支导电杆，使通过导电杆主体的电流同时取道分支导电杆，通过分支导电杆的行波电流减小，在分支导电杆上套设有磁环串组，行波电流较小无法使磁环达到饱和，从而保证了磁环能够稳定地抑制VFTO。
The invention relates to the technical field of electrical equipment, and specifically provides a VFTO suppression device and a GIS device using the VFTO suppression device. The VFTO suppression device includes a conductive rod, and the conductive rod includes a conductive rod body, and the conductive rod body is along its own axial direction. The conductive rods are arranged at intervals, at least two or more branched conductive rods are arranged in parallel between the main bodies of the conductive rods, and a magnetic ring series group is sleeved on the outer peripheral surface of each branched conductive rod. By arranging a plurality of branched conductive rods between the main bodies of the conductive rods, the current passing through the main body of the conductive rods can pass through the branched conductive rods at the same time, the traveling wave current passing through the branched conductive rods is reduced, and a magnetic ring string is sleeved on the branched conductive rods The small traveling wave current cannot make the magnetic ring reach saturation, thus ensuring that the magnetic ring can stably suppress VFTO.
Description
Technical field
The present invention relates to electrical equipment technical fields, and in particular to a kind of VFTO inhibits device and GIS device.
Background technique
Each time operation of the disconnecting switch in Cubicle Gas-Insulated Switchgear (GIS) all occurs tens of times even
Hundreds of re-ignition, the voltage at contact gap both ends fall suddenly in several ns, and voltage steep wave constantly generates row in GIS
Complicated refraction, reflection and superposition occur for wave, generate very fast transient overvoltage (calling VFTO in the following text).VFTO is a kind of special
Overvoltage, main there are three features: first is that bandwidth (from zero to MHz up to a hundred)；Second is that steepness is big, (rise time can be down to number
ns)；Third is that amplitude is high (up to 3p.u.).
VFTO has a major impact the safe operation of GIS device, external connection apparatus and secondary device, and with system
The raising of voltage class, this influence is more and more significant, especially prominent in extra-high voltage system.Therefore, for electric system
Safe and stable operation, it is necessary to responsible measures be taken to inhibit the VFTO in extra-high voltage GIS.
In the prior art, ferrite bead can effectively inhibit VFTO, and it is to solve that high-frequency magnetic is installed in the circuit GIS
An economy, the reliable method of VFTO problem.But the magnetic conductivity of high-frequency magnetic changes with the variation of magnetic field strength,
When Ferrite Material tends to saturation, incremental permeability goes to zero.That is, at saturation condition, ferrite high-frequency magnetic inhibits
The effect of VFTO will disappear.In GIS in practical projects, the travelling wave current of VFTO can reach kilo-ampere, so big
Travelling wave current under, will lead to magnet ring and be seriously saturated, lose inhibit traveling wave steepness and amplitude ability, it is therefore desirable to take effectively
Measure avoids magnet ring from being seriously saturated, and guarantees the reliability that VFTO inhibits.
Increasing magnet ring dosage energy partial offset saturation influences, but is based on following reason, the magnetic installed in Practical Project
Number of rings amount can not be infinitely more: first is that increasing magnet ring quantity will increase equipment cost, second is that GIS compact structure limits magnet ring
Installation number, therefore, be excessively increased magnet ring quantity be not solve magnet ring saturation problem good method.
The maximum restraining factors of magnet ring inhibition VFTO are the influences of saturation effect.Ferrite bead can Approximate Equivalent at non-thread
The electrical component of property inductance and resistor coupled in parallel.When VFTO is generated, nonlinear inductance reduces the steepness of traveling wave, and resistance reduces traveling wave
Amplitude.
With the raising of travelling wave current, the magnetic conductivity of magnetic material will tend to be saturated, and magnetic conductivity reduces, the equivalent electricity of magnet ring
Sense will reduce, and will weaken to the inhibiting effect of VFTO.For saturated characteristic, Langevin functional simulation magnetic material can be used
Static magnetization curve:
Wherein, MsIt is saturation magnetization, μ0It is space permeability, μiIt is starting relative permeability.Vortex characteristic, electricity consumption
Resistance rate ρ characterization.Such as the ferrite bead of model R2KB, saturation magnetization 0.5T, initial permeability 2500, electricity
Resistance rate is 0.03 Ω m, it is assumed that magnet ring thickness 15mm, internal diameter 120mm, outer diameter 160mm.
It is estimated by taking this ferrite bead as an example, under DC case, 100A electric current is passed through in the conducting rod of GIS i.e.
Reach critical saturation；Under transient current, due to the demagnetizing effect of vortex, electric current needed for reaching saturation can be increased.
Comprehensively considering magnet ring itself also has certain attenuation to pulse travelling wave current, estimates the critical saturation of ferrite bead under VFTO
Electric current is in the 1kA order of magnitude.
Extra-high voltage GIS wave impedance is generally 70~100 Europe, estimates by peak-to-peak value breakdown voltage 1800kV, after breakdown for the first time
Pulse amplitude 900kV, 10kA or so can be reached by generating pulse current amplitude, and magnet ring is difficult work under the transient current of such amplitude
Make in linear zone.
When magnet ring is applied in extra-high voltage GIS, the saturation of magnetic material is inevitable.Magnet ring saturation effect can substantially weaken
The effect for inhibiting VFTO even loses the ability for inhibiting VFTO under big travelling wave current, and magnet ring, which inhibits the maximum of VFTO to keep in check, is
The influence of saturation, so need to propose a kind of economic, effective, reliable device now to reduce the travelling wave current by magnet ring,
To guarantee that magnet ring inhibits the reliability of VFTO to limit or even avoid the saturation effect of magnet ring.
Summary of the invention
The purpose of the present invention is to provide a kind of VFTO to inhibit device, can be improved prior art middle magnetic ring and inhibits to VFTO
Reliability；Another object of the present invention is to provide a kind of GIS device for inhibiting device using the VFTO, can to VFTO into
Row effectively inhibits, and improves the safety of equipment.
To achieve the above object, the VFTO in the present invention inhibits device to adopt the following technical scheme that
VFTO inhibits device, including conducting rod, conducting rod include conducting rod main body, and the conducting rod main body is axial along itself
Arranged for interval, parallel arrangement has at least two or more branch's conducting rods, the periphery of each branch's conducting rod between conducting rod main body
Magnet ring string group is arranged on face.
The beneficial effect is that: by being provided with two or more branch's conducting rods between conducting rod main body, make to pass through
The electric current of conducting rod main body while branch's conducting rod of choosing the road through are reduced by the travelling wave current of branch's conducting rod, in branch's conducting rod
On be arranged with magnet ring string group, travelling wave current is smaller can not to make magnet ring reach saturation, to ensure that magnet ring can steadily inhibit
VFTO；And for branch's conducting rod of more parallel arrangements when being passed through electric current, current direction is identical, can be in each branch's conducting rod
Interior generation parasitic inductance can be further reduced electric current, guarantee magnet ring will not be made to reach saturation by the travelling wave current of magnet ring,
It can guarantee that magnet ring is not influenced by saturation effect, guarantee that magnet ring inhibits the reliability of VFTO, in addition, technical staff can basis
The standard component size of magnet ring makes branch's conducting rod, avoids customized magnet ring, reduces production cost.
Further, branch's conducting rod is arranged in parallel between two conducting rod main bodys.
The beneficial effect is that: the axial direction by branch's conducting rod along conducting rod main body is arranged in parallel, and can make to pass through conduction
The electric current of bar main body is distributed as uniformly as possible on branch's conducting rod, and produced between the branch's conducting rod being arranged in parallel
Parasitic inductance intensity it is higher.
Further, the conducting rod main body includes being projected radially outward along conducting rod main body for leading with branch
The transition disc of electric pole connection, branch's conducting rod are evenly arranged on transition disc.
The beneficial effect is that: transition disc is provided in conducting rod main body, when branch's conducting rod is connected on transition disc
With bigger arrangement space, magnet ring string group is sleeved on branch's conducting rod convenient for technical staff, and transition disc energy is set
Enough increase the contact area between conducting rod main body and branch's conducting rod, branch's conducting rod is enable to undertake bigger electric current.
Further, the magnet ring string group on each branch's conducting rod is led with the magnet ring string group on contiguous branch conducting rod along branch
Electric pole axially offsets arrangement.
The beneficial effect is that: magnet ring string group is axially offset into arrangement along branch's conducting rod, there is technical staff more
Magnet ring string group is assembled in big operating space.
Further, the cross-sectional area sum of branch's conducting rod is greater than the cross-sectional area of conducting rod main body.
The beneficial effect is that: the cross-sectional area sum of branch's conducting rod is greater than the cross-sectional area of conducting rod main body, can
Guarantee branch's conducting rod can carry by conducting rod main body transmit Lai distribution electric current.
To achieve the above object, GIS device adopts the following technical scheme that in the present invention
GIS device inhibits device including bus and the VFTO being connected between bus, and the VFTO inhibits device, including
Conducting rod, conducting rod include conducting rod main body, and the conducting rod main body is arranged along itself axially spaced-apart, between conducting rod main body simultaneously
Connection is disposed at least two or more branch's conducting rods, is arranged with magnet ring string group on the outer peripheral surface of each branch's conducting rod.
The beneficial effect is that: by being provided with two or more branch's conducting rods between conducting rod main body, make to pass through
The electric current of conducting rod main body while branch's conducting rod of choosing the road through are reduced by the travelling wave current of branch's conducting rod, in branch's conducting rod
On be arranged with magnet ring string group, travelling wave current is smaller can not to make magnet ring reach saturation, to ensure that magnet ring can steadily inhibit
VFTO；And for branch's conducting rod of more parallel arrangements when being passed through electric current, current direction is identical, can be in each branch's conducting rod
Interior generation parasitic inductance can be further reduced electric current, guarantee magnet ring will not be made to reach saturation by the travelling wave current of magnet ring,
It can guarantee that magnet ring is not influenced by saturation effect, guarantee that magnet ring inhibits the reliability of VFTO, in addition, technical staff can basis
The standard component size of magnet ring makes branch's conducting rod, avoids customized magnet ring, reduces production cost；VFTO inhibits device can
The VFTO in GIS device is effectively inhibited, making GIS device, the safety is improved.
Further, branch's conducting rod is arranged in parallel between two conducting rod main bodys.
The beneficial effect is that: the axial direction by branch's conducting rod along conducting rod main body is arranged in parallel, and can make to pass through conduction
The electric current of bar main body is distributed as uniformly as possible on branch's conducting rod, and produced between the branch's conducting rod being arranged in parallel
Parasitic inductance intensity it is higher.
Further, the conducting rod main body includes being projected radially outward along conducting rod main body for leading with branch
The transition disc of electric pole connection, branch's conducting rod are evenly arranged on transition disc.
The beneficial effect is that: transition disc is provided in conducting rod main body, when branch's conducting rod is connected on transition disc
With bigger arrangement space, magnet ring string group is sleeved on branch's conducting rod convenient for technical staff, and transition disc energy is set
Enough increase the contact area between conducting rod main body and branch's conducting rod, branch's conducting rod is enable to undertake bigger electric current.
Further, the magnet ring string group on each branch's conducting rod is led with the magnet ring string group on contiguous branch conducting rod along branch
Electric pole axially offsets arrangement.
The beneficial effect is that: magnet ring string group is axially offset into arrangement along branch's conducting rod, there is technical staff more
Magnet ring string group is assembled in big operating space.
Further, the cross-sectional area sum of branch's conducting rod is greater than the cross-sectional area of conducting rod main body.
The beneficial effect is that: the cross-sectional area sum of branch's conducting rod is greater than the cross-sectional area of conducting rod main body, can
Guarantee branch's conducting rod can carry by conducting rod main body transmit Lai distribution electric current.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that VFTO inhibits Installation practice 1 in the present invention；
Fig. 2 is the structural schematic diagram that VFTO inhibits Installation practice 2 in the present invention.
In figure: 1. conducting rod main bodys；2. transition disc；3. magnet ring string group；4. branch's conducting rod.
Specific embodiment
Now in conjunction with attached drawing, description of specific embodiments of the present invention.
As shown in Figure 1, inhibiting the embodiment 1:VFTO of device to inhibit device including forming device master for VFTO in the present invention
The conducting rod of body, conducting rod, which is connected in access, can transmit electric current, and conducting rod includes two conducting rod main bodys 1, conducting rod master
Body 1 is arranged along conducting rod axially spaced-apart.The radial dimension of conducting rod main body 1 is larger, can once pass through high current, and leads
Electric pole further includes the more branch's conducting rods 4 for being arranged between two conducting rod main bodys 1 and being separately connected with two conducting rod main bodys 1,
It realizes and is connected in parallel between two conducting rod main bodys 1 between each branch's conducting rod 4.
In this example, conducting rod main body 1 is provided with the radial direction along conducting rod main body 1 close to one end of branch's conducting rod 4
The transition disc 2 that the disc structure outwardly protruded, i.e. realization conducting rod main body 1 are electrically connected with 4 formation of branch conducting rod.In two conductions
It is evenly equipped with three branch's conducting rods 4 between transition disc 2 in bar main body 1, and is parallel to each other between each branch's conducting rod 4 and equal edge
Conducting rod main body 1 axial direction extend.Magnet ring string group 3, magnet ring are respectively arranged on the outer peripheral surface of each branch's conducting rod 4
The insulating layer for realizing the two insulation is provided between string group 3 and branch's conducting rod 4, magnet ring string group 3 is that ferrite bead combines shape
At, 3 flush with each other of magnet ring string group on each branch's conducting rod 4, on the same position axial in branch's conducting rod 4.
By the way that branch's conducting rod 4 in parallel is arranged in conducting rod, wears and connect in main conductive circuit when conducting rod, traveling wave is electric
Stream realizes shunting through conducting rod main body 1 and at branch's conducting rod 4, and the sum of electric current on each branch's conducting rod 4, which is equal to, to be passed through
Total current in conducting rod main body 1, while magnet ring string group 3 is provided on the outer peripheral surface of branch's conducting rod 4, pass through this shunting
Travelling wave current on mode Shi Ge branch conducting rod 4 greatly reduces, and reduces the seriousness of 3 middle magnetic ring of magnet ring string group saturation, mentions
High magnet ring inhibits the efficiency of VFTO, and since the travelling wave current on branch's conducting rod 4 reduces, is correspondingly arranged at each branch and leads
Magnet ring quantity on electric pole 4 can also correspondingly reduce.The magnet ring quantity on each branch's conducting rod 4 is led with independent use in principle
The magnet ring quantity being located on 1 periphery of conducting rod main body when electric pole main body 1 is identical.It can increase in the case where VFTO is more serious
The quantity of magnet ring.
Quantity n for the branch's conducting rod 4 being arranged between two conducting rod main bodys 1 will be in conducting rod as n=5
Branch's conducting rod 4 is provided with 5, and electric current of the travelling wave current distribution at this time on every branch's conducting rod 4 is by conducting rod electricity
/ 5th of I are flowed, i.e. branch current is 20%I, and the magnet ring degree of saturation in magnet ring string group 3, which can drop to, is sleeved on magnet ring
20% when in conducting rod main body 1.And in prediction on such basis, as n=10, the travelling wave current distributed on every branch's conducting rod 4 is
The 10% of total current, corresponding magnet ring degree of saturation can also drop to original 10%, estimate according to peak-to-peak value, generate after breakdown
Pulse current is about 10kA, and the maximum current that the magnet ring string group 3 being set on branch's conducting rod 4 is born is only 1kA, has been connect
The critical saturation current of ferrite bead at VFTO closely estimated.The above estimation is that simulation magnet ring includes the case where most serious,
In practical projects, the quantity n of branch's conducting rod 4 may can be met the requirements much smaller than 10, and due to the limitation of structure,
Limitation is produced to the quantity n of branch's conducting rod 4, is comprehensively considered, the optimum valuing range of the quantity n of branch's conducting rod 4 are as follows: 1
≤n≤10.Wherein, the cross-sectional area sum of each branch's conducting rod 4 is greater than the cross-sectional area of conducting rod main body 1 to guarantee each branch
Conducting rod 4 is able to bear distributed electric current.
As shown in Fig. 2, inhibiting the embodiment 2 of device for VFTO in the present invention: only existing with the difference of above-described embodiment 1
In the quantity for the branch's conducting rod 4 being arranged between transition disc 2, in this example, branch's conducting rod 4 is disposed with six, corresponds to equal
Cloth is on two transition discs 2.But the magnet ring string group 3 on each branch's conducting rod 4 interferes in order to prevent, in branch's conducting rod 4
On magnet ring string group 3 and the magnet ring string group 3 on adjacent two branch's conducting rods 4 axially offset arrangement along branch's conducting rod.
Device is inhibited for the VFTO in embodiment 1, embodiment 2, can connect in the circuit for needing that magnet ring is inhibited to be saturated
In, such as be arranged in the connection line of GIS, GIL, it can also be used as an individual product and sold.
When VFTO in the production present invention inhibits device, conducting rod main body, transition disc and branch can be fabricated separately and lead
Then electric pole is again fitted together three by the modes such as being spirally connected, welding or be interference fitted.
It in other embodiments, can be with a kind of radial between each branch's conducting rod due to the limitation of certain structures
Connection type is connected between two conducting rod main bodys, and no longer by the way of parallel arrangement.
In other embodiments, each branch's conducting rod can be connected directly between in the corresponding end surface of conducting rod main body, without
Transition disc is arranged again to connect with branch conducting rod.
In other embodiments, the cross-sectional area sum of each branch's conducting rod can be less than or equal to the cross of conducting rod main body
Sectional area.
GIS device includes bus in the present invention and the VFTO being connected between bus inhibits device, which inhibits device
The VFTO in Installation practice is inhibited to inhibit the structure of device identical with above-mentioned VFTO, therefore the embodiment about GIS device
It repeats no more.
Embodiments described above has carried out further goal of the invention of the invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all any modification, equivalent substitution, improvement and etc. within the spirit and principles in the present invention, done should all wrap
Containing within protection scope of the present invention.
Claims (6)
1.VFTO inhibits device, it is characterised in that: including conducting rod, conducting rod includes conducting rod main body, the conducting rod main body
It is arranged along itself axially spaced-apart, parallel arrangement has at least two or more branch's conducting rods between conducting rod main body, and each branch leads
Magnet ring string group is arranged on the outer peripheral surface of electric pole.
2. VFTO according to claim 1 inhibits device, it is characterised in that: branch's conducting rod is arranged in parallel in two and leads
Between electric pole main body.
3. VFTO according to claim 1 or 2 inhibits device, it is characterised in that: the conducting rod main body includes along leading
Electric pole main body project radially outward with the transition disc for being connect with branch conducting rod, branch's conducting rod is evenly arranged on transition
On disk.
4. VFTO according to claim 1 or 2 inhibits device, it is characterised in that: the magnet ring string group on each branch's conducting rod
Arrangement is axially offset along branch's conducting rod with the magnet ring string group on contiguous branch conducting rod.
5. VFTO according to claim 1 or 2 inhibits device, it is characterised in that: the cross-sectional area of branch's conducting rod
The sum of be greater than conducting rod main body cross-sectional area.
6.GIS equipment inhibits device including bus and the VFTO being connected between bus, it is characterised in that: the VFTO inhibits
Device is that VFTO described in any one of the claims 1 to 5 inhibits device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910065154.1A CN109888757A (en) | 2019-01-23 | 2019-01-23 | VFTO suppression device and GIS equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910065154.1A CN109888757A (en) | 2019-01-23 | 2019-01-23 | VFTO suppression device and GIS equipment |
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| CN109888757A true CN109888757A (en) | 2019-06-14 |
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ID=66926673
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| CN201910065154.1A Pending CN109888757A (en) | 2019-01-23 | 2019-01-23 | VFTO suppression device and GIS equipment |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102044867A (en) * | 2011-01-12 | 2011-05-04 | 福建省电力有限公司电力科学研究院 | Device for reducing lightning invasion wave gradient of transformer |
| CN103236684A (en) * | 2013-04-17 | 2013-08-07 | 清华大学 | High-frequency magnet ring device for restraining very fast transient overvoltage |
| CN103904785A (en) * | 2014-04-11 | 2014-07-02 | 张健 | Multi-combination sensing power taking and transformation device for high-voltage power transmission line |
| CN205264589U (en) * | 2015-12-08 | 2016-05-25 | 新东北电气集团超高压有限公司 | Restrain device that isolator operation produced VFTO |
| CN106992510A (en) * | 2017-05-25 | 2017-07-28 | 云南电网有限责任公司电力科学研究院 | Suppress the magnetic ring device of very fast transient overvoltage in gas-insulated switchgear |
| CN206451716U (en) * | 2017-01-24 | 2017-08-29 | 天津市倍利加科技发展有限公司 | A kind of semiconductor discharge tube |
-
2019
- 2019-01-23 CN CN201910065154.1A patent/CN109888757A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102044867A (en) * | 2011-01-12 | 2011-05-04 | 福建省电力有限公司电力科学研究院 | Device for reducing lightning invasion wave gradient of transformer |
| CN103236684A (en) * | 2013-04-17 | 2013-08-07 | 清华大学 | High-frequency magnet ring device for restraining very fast transient overvoltage |
| CN103904785A (en) * | 2014-04-11 | 2014-07-02 | 张健 | Multi-combination sensing power taking and transformation device for high-voltage power transmission line |
| CN205264589U (en) * | 2015-12-08 | 2016-05-25 | 新东北电气集团超高压有限公司 | Restrain device that isolator operation produced VFTO |
| CN206451716U (en) * | 2017-01-24 | 2017-08-29 | 天津市倍利加科技发展有限公司 | A kind of semiconductor discharge tube |
| CN106992510A (en) * | 2017-05-25 | 2017-07-28 | 云南电网有限责任公司电力科学研究院 | Suppress the magnetic ring device of very fast transient overvoltage in gas-insulated switchgear |
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Application publication date: 20190614 |