CN105352911B - A kind of exciting surge suppressor on three-phase ganged breaker - Google Patents
A kind of exciting surge suppressor on three-phase ganged breaker Download PDFInfo
- Publication number
- CN105352911B CN105352911B CN201510905344.1A CN201510905344A CN105352911B CN 105352911 B CN105352911 B CN 105352911B CN 201510905344 A CN201510905344 A CN 201510905344A CN 105352911 B CN105352911 B CN 105352911B
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- China
- Prior art keywords
- main frame
- filter
- surge suppressor
- volume measuring
- spectrometer unit
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- 238000001914 filtration Methods 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 12
- 230000008676 import Effects 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000000356 contaminant Substances 0.000 claims description 2
- 230000005284 excitation Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011172 small scale experimental method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000001149 thermolysis Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- 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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
A kind of exciting surge suppressor on three-phase ganged breaker, including transformer main frame and detector housing, the sidepiece of transformer main frame sets drawer chassis, drawer box is set in drawer chassis, installation exciting surge suppressor main frame in drawer box, exciting surge suppressor main frame connects breaker, transformer main frame is provided with oil drum, spectrometer unit and device for filtering impurities are set in detector housing, device for filtering impurities includes support, two volume measuring instruments and filter are installed on support, two volume measuring instruments are separately mounted to the upper and lower part of filter, volume measuring instrument and filter series connection；Second communicating pipe was set between device for filtering impurities and spectrometer unit, is provided with delivery pump the second communicating pipe, sampler, sampler connection oil drum and import are set on detector housing.
Description
Technical field
The present invention, which relates to, belongs to transformer oil testing equipment field, is exactly a kind of be used on three-phase ganged breaker
Exciting surge suppressor.
Background technology
When transformer during no-load closing moment, due to transformer core magnetic flux saturation, the presence of relict flux and iron core material
The nonlinear characteristic of material, the sizable excitation surge current of amplitude can be produced, the transient process by several weeks ripple reaches stable state, this
The switching current of individual impact is often up to 6-8 times of rated current.In addition, the excitation surge current will cause this regional voltage again
Fluctuation, cause the change with the transformer magnetizing current of its paired running, that is, produce and echo surge current.Thus transformation may be caused
Device differential protection misoperation, transformer insulated damage, winding deformation, while reduce power system power supply quality.Transformer oil is
A kind of fraction products of oil, there is the effect such as insulation, thermolysis, extinguishing arc in transformer application.Change after long-term use
Depressor oil needs periodic detection, avoids oil deterioration from causing effect to decline.At present, detect to enter using spectrometer for transformer oil
OK.Insoluble greasy filth, fiber and foul etc. be present in long-term use of transformer oil, these materials may cause spectrometer to block up
Plug, causes failure together.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of excitation surge current suppression on three-phase ganged breaker
Device processed.
The present invention to achieve the above object, is achieved through the following technical solutions：
A kind of exciting surge suppressor on three-phase ganged breaker, including transformer main frame and detector housing,
The sidepiece of transformer main frame sets drawer chassis, and drawer box is set in drawer chassis, exciting surge suppressor main frame is installed in drawer box,
Exciting surge suppressor main frame connects breaker, and transformer main frame is provided with oil drum, spectrometer unit is set in detector housing
And device for filtering impurities, device for filtering impurities include support, two volume measuring instruments and filter, two volumes are installed on support
Measuring instrument is separately mounted to the upper and lower part of filter, volume measuring instrument and filter series connection；Volume measuring instrument by bottle, every
Off-network, infrared survey instrument and floater shot composition, bottle upper and lower part set inlet and outlet, set vertically in bottle respectively
Separation net, floater shot are located in bottle, and bottle upper side installation infrared survey instrument, infrared survey instrument is located at floater shot side；
Filter is made up of filtration barrel body, several screen packs and upper capping, and filtration barrel body inwall sets fixture block, and several screen packs divide up and down
Cloth is coordinated by support bar between each other, and support bar card is placed on fixture block, and upper capping coordinates with filtration barrel body；Upper capping and filtering
The volume measuring instrument on device top is connected by flexible pipe；Second communicating pipe was set between device for filtering impurities and spectrometer unit, the
It is provided with delivery pump two communicating pipes, sampler, sampler connection oil drum and import is set on detector housing.
Further to realize the purpose of the present invention, following technical scheme can also be used：Described sampler includes electricity
Push rod and sleeve, piston rod and the sleeve of electric putter coordinate, and sleeve connects oil drum by conduit, and check valve is installed on conduit, covers
Branch pipe is set on cylinder, and branch pipe connects import, magnetic valve is installed on branch pipe.Between described spectrometer unit and device for filtering impurities
De-watering apparatus is set, third connecting pipe is set between de-watering apparatus and spectrometer unit, triple valve is set on the second communicating pipe, three
Port valve connects one end of the first communicating pipe, the other end connection de-watering apparatus of the first communicating pipe；De-watering apparatus includes base, base
Two weighers of upper installation and vacuum drainage cylinder, two weighers are located at vacuum drainage cylinder both ends respectively, and weigher is arranged with vacuum
Water drum is connected；Weigher is made up of weighing cup and electronic scale, and weighing cup is fixedly mounted on the top of electronic scale；Vacuum drainage cylinder bag
Cylinder is included, heating rod is set in cylinder, the top of cylinder sets gas-liquid separator, gas-liquid separator connection vavuum pump.Described
Input keyboard, overturning seat and display screen, display screen is set to be connected by overturning seat with spectrometer unit on spectrometer unit.It is described
The display screen of spectrometer unit be exposed at outside detector housing.
The advantage of the invention is that：In the present invention, exciting surge suppressor main frame is matched somebody with somebody using drawer type with transformer main frame
Close, convenient installation, be easy to repair and safeguard.By exciting surge suppressor main frame, breaker caused by avoiding excitation surge current misses
It is dynamic, with accurate phase control technology, primary equipment is controlled with secondary device, fundamentally realizes effective suppression of excitation surge current
System.Transformer oil can be timed detection, avoid because oil quality change influences the normal operation of transformer.The present invention exists
Tested transformer oil can be filtered before detection, insoluble greasy filth, fiber and dirt filtration are come out, avoided spectrum
Instrument blocks.After being filtered by device for filtering impurities, the volume number obtained shared by impurity can be calculated, determines that tested transformer oil is
It is no can carry out filtration treatment after reuse, so as to decide whether to be necessary the transformer oil renewed again, avoid wasting.Cross
It is convenient to be cleared up after filter.Transformer oil after filtering is after kaleidophon detects, it is possible to reduce the influence of solid matter, discharges physics
Factor, obtain experimental result and more press close to production and application.The present invention also has compact, manufacturing cost simple for structure cheap and used
The advantages of easy.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；Fig. 2 is Fig. 1 I partial enlargement structural representation；Fig. 3 is II innings of Fig. 1
Portion's mplifying structure schematic diagram.
Reference：The vacuum of 1 spectrometer unit 2 input keyboard 3 overturning seat, 4 display screen, 5 weighing cup, 6 electronic scale 7
The filter of 14 volume measuring instrument of adjutage 8 base, 9 heating rod, 10 weigher, 11 triple valve, 12 delivery pump, 13 support 15
16 first 17 second communicating pipe of communicating pipe 18 vavuum pump, 19 gas-liquid separator, 20 third connecting pipe, 21 bottle, 22 separation net
On the support bar 31 of the import 26 of 23 infrared survey instrument, 24 floater shot 25 outlet 27 filtration barrel body, 28 fixture block, 29 screen pack 30
The transformer body 39 of 32 detector housing, 33 electric putter, 34 sleeve, 35 magnetic valve, 36 check valve, 37 oil drum 38 is covered to encourage
The branch pipe of 43 conduit of magnetic surge suppression device main frame 40 drawer chassis, 41 drawer box, 42 breaker 44.
Embodiment
A kind of exciting surge suppressor on three-phase ganged breaker, as shown in Figure 1, Figure 2 and Figure 3, including transformation
Device main frame 38 and detector housing 32, the sidepiece of transformer main frame 38 set drawer chassis 40, drawer box 41 are set in drawer chassis 40,
Installation exciting surge suppressor main frame 39 in drawer box 41, exciting surge suppressor main frame 39 connects breaker 42, transformer master
Machine 38 is provided with oil drum 37, sets spectrometer unit 1 and device for filtering impurities, device for filtering impurities to include in detector housing 32
Support 13, two volume measuring instruments 14 are installed on support 13 and filter 15, two volume measuring instruments 14 are separately mounted to filter
The upper and lower part of device 15, volume measuring instrument 14 and filter 15 are connected；Volume measuring instrument 14 is by bottle 21, separation net 22, red
External pelivimetry instrument 23 and floater shot 24 form, and the upper and lower part of bottle 21 sets import 25 and outlet 26 respectively, is set in bottle 21
Vertical separation net 22, floater shot 24 are located in bottle 21, the upper side of bottle 21 installation infrared survey instrument 23, infrared survey instrument
23 are located at the side of floater shot 24；Filter 15 is made up of filtration barrel body 27, several screen packs 29 and upper capping 31, filtration barrel body 27
Inwall sets fixture block 28, and several screen packs are distributed about 29 to be coordinated by support bar 30 between each other, and the card of support bar 30 is placed on card
On block 28, upper capping 31 coordinates with filtration barrel body 27；Upper capping 31 and the volume measuring instrument 14 on the top of filter 15 pass through flexible pipe
Connection；Second communicating pipe 17 was set between device for filtering impurities and spectrometer unit 1, the second communicating pipe 17 was provided with delivery pump
12.Sampler, sampler connection oil drum 37 and import 25 are set on detector housing 32.Described sampler includes electricity
Push rod 33 and sleeve 34, piston rod and the sleeve 34 of electric putter 33 coordinate, and sleeve 34 connects oil drum 37, conduit 43 by conduit 43
It is upper that check valve 36 is installed, branch pipe 44 is set on sleeve 34, and branch pipe 44 connects import 25, magnetic valve 35 is installed on branch pipe 44.Close
Magnetic valve 35, piston rod is withdrawn by electric putter 33, make to produce negative pressure in sleeve 34, transformer oil is suctioned out and sampled, open electricity
Magnet valve 35, electric putter pushes out piston rod, and the transformer oil of sampling is pushed into detector is detected, due to the work of check valve
With sample will not flow back.Said structure sampling is convenient, easy to operate.
The present invention use process be：Examined transformer oil sample is added to the volume measuring instrument 14 on top,
Before addition, the valve of the upper outlet of volume measuring instrument 14 is closed.With the addition of transformer oil, floater shot 24 floats up, every
Avoid floater shot 24 to move left and right under the limitation of off-network 22, add after stopping, floater shot 24 is measured by infrared survey instrument 23
Position, so that it is determined that the volume of the transformer oil added.Transformer oil in the volume measuring instrument 14 on top is passed through into filter
15 filtered after enter bottom volume measuring instrument 14.Similarly, the volume of the transformer oil after filtering can be measured, so as to obtain
The amount of impurity must be filtered out.If the amount of filtered impurities is fewer, illustrate that the transformer oil makes again after being filtered
With.For filter 15, upper capping 31 can be opened during cleaning, screen pack 29 is taken out into cleaning.
Due to many moisture in transformer oil also be present, moisture can also influence testing result, to the transformer of long-term use
The water content detection of oil and an important indicator.In order to realize small-scale experiment, described spectrometer unit 1 and contaminant filter dress
De-watering apparatus is set between putting, third connecting pipe 20 is set between de-watering apparatus and spectrometer unit 1, set on the second communicating pipe 17
Triple valve 11 is put, triple valve 11 connects one end of the first communicating pipe 16, the other end connection de-watering apparatus of the first communicating pipe 16；Remove
Water installations include base 8, install two weighers 10 on base 8 and vacuum drainage cylinder 7, two weighers 10 are located at vacuum respectively
The both ends of adjutage 7, weigher 10 are connected with vacuum drainage cylinder；Weigher 10 is made up of weighing cup 5 and electronic scale 6, and weighing cup 5 is solid
Dingan County is mounted in the top of electronic scale 6；Vacuum drainage cylinder 7 includes cylinder, and heating rod 9 is set in cylinder, and the top of cylinder sets gas
Liquid/gas separator 19, gas-liquid separator 19 connect vavuum pump 18.Transformer oil after filtering is added to being claimed in weigher 10
Amount, enter after weighing in vacuum drainage cylinder 7, it is moisture evaporation to improve temperature by heating rod 9, is reduced and pressed by vavuum pump 18
Power, the moisture in transformer oil is extruded, moisture is separated by gas-liquid separator 19.Transformer oil after draining is entering separately
One weigher 10 is weighed, so that it is determined that the water content in transformer oil.It may determine that transformer oil is according to water content
It is no to recycle.
Input keyboard 2, overturning seat 3 and display screen 4, display screen 4 is set to pass through overturning seat 3 on described spectrometer unit 1
It is connected with spectrometer unit 1.Display screen 4 and input keyboard 2 are structure as a whole with spectrometer main frame 1, easy to use, without connecting in addition
Equipment is connect, the turnover of display screen 4 can be protected into display screen 4 when not in use, display screen 4 can be covered on input keyboard 2, also can
Protection input keyboard 2.The display screen 4 of described spectrometer unit 1 is exposed at outside detector housing 32, convenient observation and place
Reason.
Technical scheme is not restricted in the range of embodiment of the present invention.The not detailed description of the present invention
Technology contents be known technology.
Claims (3)
- A kind of 1. exciting surge suppressor on three-phase ganged breaker, it is characterised in that：Including transformer main frame（38） And detector housing（32）, transformer main frame（38）Sidepiece set drawer chassis（40）, drawer chassis（40）Interior setting drawer box （41）, drawer box（41）Interior installation exciting surge suppressor main frame（39）, exciting surge suppressor main frame（39）Connect breaker （42）, transformer main frame（38）It is provided with oil drum（37）, detector housing（32）Interior setting spectrometer unit（1）And contaminant filter Device, device for filtering impurities include support（13）, support（13）Two volume measuring instruments of upper installation（14）And filter（15）, two Individual volume measuring instrument（14）It is separately mounted to filter（15）Upper and lower part, volume measuring instrument（14）And filter（15）String Connection；Volume measuring instrument（14）By bottle（21）, separation net（22）, infrared survey instrument（23）And floater shot（24）Composition, bottle （21）Upper and lower part sets import respectively（25）And outlet（26）, bottle（21）It is interior that vertical separation net is set（22）, floating Ball（24）Positioned at bottle（21）It is interior, bottle（21）Upper side installs infrared survey instrument（23）, infrared survey instrument（23）Positioned at drift Ball float（24）Side；Filter（15）By filtration barrel body（27）, several screen packs（29）With upper capping（31）Composition, filtration barrel body （27）Inwall sets fixture block（28）, several screen packs（29）Distribution passes through support bar between each other up and down（30）Coordinate, support bar （30）Card is placed on fixture block（28）On, upper capping（31）With filtration barrel body（27）Coordinate；Upper capping（31）With filter（15）Top Volume measuring instrument（14）Connected by flexible pipe；Device for filtering impurities and spectrometer unit（1）Between the second communicating pipe was set （17）, the second communicating pipe（17）It is provided with delivery pump（12）；Detector housing（32）Upper setting sampler, sampler connection Oil drum（37）And import（25）；Described sampler includes electric putter（33）And sleeve（34）, electric putter（33）Piston rod With sleeve（34）Coordinate, sleeve（34）Pass through conduit（43）Connect oil drum（37）, conduit（43）Upper installation check valve（36）, sleeve （34）Upper setting branch pipe（44）, branch pipe（44）Connect import（25）, branch pipe（44）Upper installation magnetic valve（35）；Described spectrometer Main frame（1）De-watering apparatus, de-watering apparatus and spectrometer unit are set between device for filtering impurities（1）Between third connecting is set Pipe（20）, the second communicating pipe（17）Upper setting triple valve（11）, triple valve（11）Connected for the first communicating pipe（16）One end, first Communicating pipe（16）The other end connection de-watering apparatus；De-watering apparatus includes base（8）, base（8）Two weighers of upper installation （10）With vacuum drainage cylinder（7）, two weighers（10）It is located at vacuum drainage cylinder respectively（7）Both ends, weigher（10）With vacuum Adjutage is connected；Weigher（10）By weighing cup（5）And electronic scale（6）Composition, weighing cup（5）It is fixedly mounted on electronic scale（6） Top；Vacuum drainage cylinder（7）Including cylinder, heating rod is set in cylinder（9）, the top of cylinder sets gas-liquid separator （19）, gas-liquid separator（19）Connect vavuum pump（18）.
- A kind of 2. exciting surge suppressor on three-phase ganged breaker according to claim 1, it is characterised in that： Described spectrometer unit（1）It is upper that input keyboard is set（2）, overturning seat（3）And display screen（4）, display screen（4）Pass through overturning seat （3）With spectrometer unit（1）Connection.
- A kind of 3. exciting surge suppressor on three-phase ganged breaker according to claim 2, it is characterised in that： Described spectrometer unit（1）Display screen（4）It is exposed at detector housing（32）It is outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510905344.1A CN105352911B (en) | 2015-12-10 | 2015-12-10 | A kind of exciting surge suppressor on three-phase ganged breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510905344.1A CN105352911B (en) | 2015-12-10 | 2015-12-10 | A kind of exciting surge suppressor on three-phase ganged breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105352911A CN105352911A (en) | 2016-02-24 |
| CN105352911B true CN105352911B (en) | 2017-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510905344.1A Active CN105352911B (en) | 2015-12-10 | 2015-12-10 | A kind of exciting surge suppressor on three-phase ganged breaker |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281129B (en) * | 2005-09-15 | 2011-06-15 | 聚光科技(杭州)股份有限公司 | On-position type gas analysis system with on-position calibration function |
| CN102495006A (en) * | 2011-11-22 | 2012-06-13 | 中国铝业股份有限公司 | Method for detecting non-anode effect CF4 |
| CN102585991A (en) * | 2011-12-22 | 2012-07-18 | 北京盈胜泰科技术有限公司 | Method and system for removing and supplying antioxidant from/to transformer insulating oil impurities |
| CN205246534U (en) * | 2015-12-10 | 2016-05-18 | 国家电网公司 | A excitation surge current inhibitor for on three -phase joined actuator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH703700A2 (en) * | 2010-09-08 | 2012-03-15 | Tecan Trading Ag | Control of the atmosphere in microplate readers. |
-
2015
- 2015-12-10 CN CN201510905344.1A patent/CN105352911B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281129B (en) * | 2005-09-15 | 2011-06-15 | 聚光科技(杭州)股份有限公司 | On-position type gas analysis system with on-position calibration function |
| CN102495006A (en) * | 2011-11-22 | 2012-06-13 | 中国铝业股份有限公司 | Method for detecting non-anode effect CF4 |
| CN102585991A (en) * | 2011-12-22 | 2012-07-18 | 北京盈胜泰科技术有限公司 | Method and system for removing and supplying antioxidant from/to transformer insulating oil impurities |
| CN205246534U (en) * | 2015-12-10 | 2016-05-18 | 国家电网公司 | A excitation surge current inhibitor for on three -phase joined actuator |
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| Publication number | Publication date |
|---|---|
| CN105352911A (en) | 2016-02-24 |
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