CN207637603U - A kind of automatic capacity transfer type distribution transformer - Google Patents
A kind of automatic capacity transfer type distribution transformer Download PDFInfo
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- CN207637603U CN207637603U CN201721243238.2U CN201721243238U CN207637603U CN 207637603 U CN207637603 U CN 207637603U CN 201721243238 U CN201721243238 U CN 201721243238U CN 207637603 U CN207637603 U CN 207637603U
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Abstract
The utility model patent is related to a kind of automatic capacity transfer type distribution transformer, including high-voltage winding wiring mechanism and low pressure winding wiring mechanism, the high-voltage winding wiring mechanism includes triangle connection circuitry and star-star connection circuit, and the low pressure winding wiring mechanism includes series wiring circuit and connection circuitry in parallel.The utility model uses mono- Y capacity transfer type principles of D, and using IGBT electronic switch modules as control, realizes the ideal operation of distribution transforming.In Neutral Point Through Low Resistance system, ground resistance meets limitation single-phase earthing overvoltage multiple, there is smaller fault current when choosing the big ground resistance of resistance value so that singlephase earth fault occurs, contact potential and step voltage can be reduced simultaneously, the interference to communication is reduced, to reduce the safety and investment problem that the system reform is caused.After earth fault occurs for resonant earthed system, rational extinguishing arc control program is formulated according to power grid actual conditions, improves the arc extinguishing of arc suppression coil and the ability of electric power netting safe running.
Description
Technical field
The utility model is related to transformer technology fields, more specifically to a kind of automatic capacity transfer type distribution transformer.
Background technology
After the advent of transformer, by the technological improvement and development of last 100 years, purposes is very extensive, and description is with electricity consumption
The increase of type is also more and more.Power transformer and special transformer two major classes can be divided at present.It can be divided by voltage regulating mode
Without two kinds of excitatory pressure regulation and on-load regulator transformer.As the expansion of power grid, generator list grab the increase of capacity, transmission voltage
It improves and the increasing of transmitted power, 1930's starts, it is desired to develop the large-scale power transformer of higher voltage.Energy simultaneously
Consumption also gradually increases, and transformer is the important component in power transmission and transformation system.The quality of itself performance directly affects electric power
The power supply quality of system, so designing, manufacturing, there is objective economic benefit and social benefit using low energy consumption transformer.In
Miniature transformer is the emphasis of China's development energy saving transformer.Low loss transformer series is designed and manufactured as work(, reduces
The gap of power transformer product and world level, is a much progress of Chinese transformer technology.Various design schemes although oneself
It is transformed through having made many energy-saving designs to distribution transformer, but to the king-sized distribution transformer of amplitude of variation.It should also be from addition
One thinking designs, that is, designs a kind of loaded capacity-regulated transformer that automatic capacity transfer can be achieved, and reduce machine in adjustment process
Tool is slipped up, and great-power electronic element such as IGBT module is preferably applied.
Utility model content
The technical problem to be solved by the present invention is to for the defects in the prior art, provide a kind of automatic capacity transfer
Type distribution transformer.
Technical solution adopted by the utility model to solve its technical problems is：Construct a kind of automatic capacity transfer type distribution transformer
Device, including high-voltage winding wiring mechanism and low pressure winding wiring mechanism, the high-voltage winding wiring mechanism include triangle wiring line
Road and star-star connection circuit, the low pressure winding wiring mechanism include series wiring circuit and connection circuitry in parallel.
In a kind of automatic capacity transfer type distribution transformer described in the utility model, capacity transfer type primary side per mutually for one around
Group.
In a kind of automatic capacity transfer type distribution transformer described in the utility model, the high-voltage winding wiring mechanism includes
Three-phase high-voltage winding, in large capacity, the three-phase high-voltage is around being grouped into delta connection circuit.
In a kind of automatic capacity transfer type distribution transformer described in the utility model, the high-voltage winding wiring mechanism includes
Three-phase high-voltage winding, in low capacity, the three-phase high-voltage is around being grouped into star-star connection circuit.
In a kind of automatic capacity transfer type distribution transformer described in the utility model, the low pressure winding wiring mechanism includes
Three-phase low-voltage winding is made of three parts winding segments per phase low pressure winding, when large capacity, the second low pressure winding section and third low pressure
After winding segments parallel connection, then connect again with the first low pressure winding section.
In a kind of automatic capacity transfer type distribution transformer described in the utility model, the low pressure winding wiring mechanism includes
Three-phase low-voltage winding is made of three parts per phase low pressure winding, and when low capacity, three groups of sections are all connected.
In a kind of automatic capacity transfer type distribution transformer described in the utility model, the wire turn of the first low pressure winding section
Number accounts for the 27% of whole low pressure winding wire turn.
In a kind of automatic capacity transfer type distribution transformer described in the utility model, the second low pressure winding section and third
The sectional area of wire of low pressure winding section is the 1/2 of the first low pressure winding section lead sectional area.
Further include neutral point resistance grounding device in a kind of automatic capacity transfer type distribution transformer described in the utility model
And Arc suppression coil grounding device, wherein the Arc suppression coil grounding device include grounding transformer fuel tank, arc suppression coil fuel tank,
The cable drawn from grounding transformer primary side neutral point and the cable drawn from arc suppression coil head end；The grounding transformer oil
Case and arc suppression coil fuel tank top are by closing connecting cylinder lateral connection, and connecting cylinder is interior, and filled with transformer oil, middle part sets bellows,
Bellows passes through flanged joint with connecting cylinder both ends cylinder；Insulating support is equipped in cylinder, current-carrying connector is fixed on insulation branch
On frame, both ends respectively by piecing devices with from grounding transformer primary side neutral point draw cable and from arc suppression coil head
Hold the cable connection drawn；Current-carrying connector is made of internal hard metal conductor and external insulation.
In a kind of automatic capacity transfer type distribution transformer described in the utility model, the neutral point resistance grounding device packet
Include earthing resistance cabinet, grounding transformer and data acquisition device, wherein the grounding transformer passes through cable and the ground connection
Resistor box connects, and the tie point of the grounding transformer and the cable is the grounding transformer neutral point；The data are adopted
Acquisition means are connect with the grounding transformer neutral point, for being monitored the grounding transformer neutral point to acquire
State the running state information of grounding transformer.
A kind of automatic capacity transfer type distribution transformer for implementing the utility model, has the advantages that：The utility model
Using a kind of mono- Y capacity transfer type principles of D, and using IGBT electronic switch modules as control, the ideal operation of distribution transforming is realized.Mono- Y tune of D
Appearance type primary side is per being mutually a winding, and in large capacity, three-phase high-voltage is around being grouped into triangle (D), three-phase high-voltage when low capacity
Around being grouped into star (Y).It is made of three parts per phase low pressure winding:When 27%, the line segment (I sections) of the number of turns, in addition 73%
For the line segment of the number of turns by two conducting wires and around into two groups (n, 111 sections), the section of every group of conducting wire is about the one of I section leads section
Half.When large capacity n, m sections it is in parallel after connect again with I section, three sections of wholes are connected when low capacity.If being adjusted to low capacity by large capacity,
Low pressure winding the number of turns increases, and vice versa.At the same time, in Neutral Point Through Low Resistance system, ground resistance needs first
Meet limitation single-phase earthing overvoltage multiple, when choosing the slightly larger ground resistance of resistance value as possible so that singlephase earth fault occurs
There is smaller fault current, while contact potential and step voltage can be reduced, the interference to communication is reduced, to reduce
The safety and investment problem that the system reform is caused.Meanwhile gapless arrestyer is relatively adapted for use with neutral point and is connect through low resistance
In the power distribution network on ground, the switching overvoltage generated in system can not only be effectively limited, and it is excessively electric to reduce lightning impulse
Pressure, can thus reduce the dielectric level of system equipment or existing equipment is made to correspondingly increase insulation margin, extend
Service life has considerable economic benefit.After earth fault occurs for resonant earthed system, according to the actual conditions system of power grid
Fixed rational extinguishing arc control program, improves the arc extinguishing of arc suppression coil and the ability of electric power netting safe running.Neutral point connects through low resistance
The selection of ground resistance also needs to consider the requirement of over-voltage multiple, zero-sequenceprotection sensitivity, to communication line in ground system
The factors such as the interference on road and Electrical Safety, and according to various regions distribution concrete condition adaptation to local conditions.Low resistance grounding and arc suppression coil
The case where ground connection is current most popular earthing mode, exclusive use has had accumulated a large amount of experiences, when the two synthesis makes
Used time, control strategy appropriate can select most suitable earthing mode according to the importance of supply line, and improving power supply can
By property.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structural representation of the wiring connection of capacity transfer type transformer mesohigh winding described in the utility model embodiment
Figure；
Fig. 2 is the structural representation of the wiring connection of capacity transfer type transformer mesolow winding described in the utility model embodiment
Figure；
Fig. 3 is capacity transfer type transformer described in the utility model embodiment and the integrated structure of Arc suppression coil grounding device
Schematic diagram；
Fig. 4 is the structural representation of capacity transfer type transformer neutral point electric resistance earthing device described in the utility model embodiment
Figure.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Fig. 1 shows a kind of automatic capacity transfer type distribution transformer, including high-voltage winding wiring mechanism and low pressure winding wiring
Mechanism, the high-voltage winding wiring mechanism include triangle connection circuitry and star-star connection circuit, the low pressure winding wiring mechanism
Including series wiring circuit and connection circuitry in parallel.
Specifically, capacity transfer type primary side is a winding per phase.
Specifically, the high-voltage winding wiring mechanism includes three-phase high-voltage winding, in large capacity, the three-phase high-voltage around
It is grouped into delta connection circuit.
Specifically, the high-voltage winding wiring mechanism includes three-phase high-voltage winding, in low capacity, the three-phase high-voltage around
It is grouped into star-star connection circuit.
Specifically, the low pressure winding wiring mechanism includes three-phase low-voltage winding, per phase low pressure winding by three parts winding
Duan Zucheng, when large capacity, after the second low pressure winding section is in parallel with third low pressure winding section, then again with the first low pressure winding section string
Connection.
Specifically, the low pressure winding wiring mechanism includes three-phase low-voltage winding, is made of three parts per phase low pressure winding,
When low capacity, three groups of sections are all connected.
Specifically, the number of wire turns of the first low pressure winding section accounts for the 27% of whole low pressure winding wire turn.
Specifically, the sectional area of wire of the second low pressure winding section and third low pressure winding section be first low pressure around
The 1/2 of group section lead sectional area.Specifically, low pressure winding and high-voltage winding can be three, when realizing large capacity mode,
It is in state of cut-offfing by S1, S3, S5 in the high toggle switch in high-voltage winding, S2, S4, S6 are real in closed state
The delta connection mode of existing high-voltage winding；Then, by S7, S8 in the low toggle switch in low pressure winding, SlO,
S13, S14 are in closed state, and S9, S12, S15, which are in, cut-offs state；To realize that the parallel-connection structure mode of connection of low pressure winding connects
It connects；Specifically, in low pressure winding, the low pressure winding includes three low pressure winding sections, is in by S7, S8, SlO, S13, S14
Closed state, S9, S12, S15, which are in, cut-offs state；To realize that the second low pressure winding section and third low pressure winding section pass through low pressure
After switching switch is connected in parallel, then connect with the first low pressure winding section.Further, in embodiments of the present invention, institute
The number of wire turns for stating the first low pressure winding section accounts for the 27% of whole low pressure winding wire turn；In addition, the second low pressure winding Duan Yu
The sectional area of wire of three low pressure winding sections can also be the 1/2 of the first low pressure winding section lead sectional area.Low pressure winding and
High-voltage winding can be three, when realizing low capacity mode, by S2 in the high toggle switch in high-voltage winding,
S4, S6, which are in, cut-offs state, and S1, S3, S5 are in the star-star connection mode of closed state high-voltage winding；Then, by low pressure around
S9, S12, S15 in low toggle switch in group is in closed state, and switch S7, S8, SlO, S11, S13, S14 are in and open
Disconnected state, to realize that the cascaded structure mode of connection of low pressure winding connects；Specifically, in low pressure winding, the low pressure winding packet
Three low pressure winding sections are included, closed state are in by S9, S12, S15, switch S7, S8, SlO, S11, S13, S14, which are in, to be cut-off
State；To realize that the whole of the first low pressure winding section, the second low pressure winding section and third low pressure winding is connected in series with.By to existing
There is transformer to be simply transformed, carrying out optional circuit to the wire turn of high-voltage winding with low pressure winding connects, and by forever
The action of magnetic mechanism control selections contactor, so as to the low capacitance adjustment for realizing transformer.Due to implementing in the present invention
In example, it is only necessary to carry out the capacity transfer that transformer can be realized in corresponding transformation to current transformer, need not purchase again high
Expensive capacitance-adjustable transformer, so, the update cost of transformer is effectively saved, and then the popularization for being conducive to capacitance-adjustable transformer makes
With.
Specifically, further include neutral point resistance grounding device and Arc suppression coil grounding device, wherein the arc suppression coil connects
Ground device include grounding transformer fuel tank, arc suppression coil fuel tank, the cable drawn from grounding transformer primary side neutral point and from
The cable that arc suppression coil head end is drawn；The grounding transformer fuel tank and arc suppression coil fuel tank top are lateral by closing connecting cylinder
Connection, connecting cylinder is interior filled with transformer oil, and middle part sets bellows, and bellows passes through flanged joint with connecting cylinder both ends cylinder；Cylinder
It is equipped with insulating support in vivo, current-carrying connector is fixed on insulating support, and both ends are become by piecing devices with from ground connection respectively
The cable and the cable connection drawn from arc suppression coil head end that depressor primary side neutral point is drawn；Current-carrying connector is by internal hard
Metallic conductor and external insulation composition.
Fig. 3 shows capacity transfer type transformer and the integrated structural schematic diagram of Arc suppression coil grounding device, for realizing connecing
The device of ground transformer connection method integrated with arc suppression coil, including grounding transformer fuel tank 1, arc suppression coil fuel tank 10, from
The cable 3 that grounding transformer primary side neutral point is drawn and the cable 11 drawn from arc suppression coil head end；The grounding transformer
Fuel tank 1 and 10 top of arc suppression coil fuel tank are by closing connecting cylinder lateral connection, and connecting cylinder is interior filled with transformer oil, and middle part sets wave
Line pipe 6, bellows 6 are connect with connecting cylinder both ends cylinder 4 by flange 7；Insulating support 5 is equipped in cylinder, current-carrying connector 8 is solid
It is scheduled on insulating support 5, both ends pass through piecing devices 9 and the cable 3 from the extraction of grounding transformer primary side neutral point respectively
And the cable 11 drawn from arc suppression coil head end connects；Current-carrying connector 8 is by internal hard metal conductor and external insulation group
At.
The grounding transformer fuel tank 1,10 top of arc suppression coil fuel tank set observation manhole 2 respectively.Connecting cylinder can be used
High-strength steel sheet moulding process manufactures, and 4 both sides of cylinder are fixedly connected with 2 fuel tanks 1,10 respectively, and middle part connects wave by flange 7
Line pipe 6, bellows 6 deforms stroke caused by whole system due to temperature has compensation function, and 4 outside of connecting cylinder cylinder can
Arrange that reinforcing rib, proof strength prevent the safe operation because deforming with influencing equipment due to displacement.2 fuel tanks 1,10 tops difference
Setting observation manhole 2, facilitates in-site installation and safeguards.
Both sides are respectively provided with insulating support 5 in connecting cylinder, are used for the fixation of internal current-carrying connector 8, ensure that interior insulation is reliable.
Transformer oil is full of in connecting cylinder, for radiating and insulating.In the utility model, current-carrying connection uses hard connecting mode, that is, adopts
Current-carrying is connected with the metallic conductor of high conductivity such as copper pipe with higher mechanical strength, outside sets insulating layer.
In the present embodiment, arc suppression coil fuel tank 1 and grounding transformer fuel tank 10 are connected by the way of closing connecting cylinder
Logical, 2 fuel tanks share an oil conservater, and integral installation keeps structure compacter on grounding transformer.
The transformer neutral point casing in connecing conventional coupling arrangement can be cancelled in the connection type that the utility model uses, disappeared
Arc coil head end bushing, an oil conservater and isolation switch, also reduce the area in substation line corridor, and make knot
Structure is simple, saves equipment investment, reduces civil engineering land used.Become and arc suppression coil integrated connecting device, reliable, peace using ground connection
Entirely, economical, improve the reliability of system operation.
Fig. 4 shows the structural schematic diagram of capacity transfer type transformer neutral point electric resistance earthing device, specifically, the neutral point
Electric resistance earthing device includes earthing resistance cabinet, grounding transformer and data acquisition device, wherein the grounding transformer passes through
Cable is connect with the earthing resistance cabinet, and the tie point of the grounding transformer and the cable is that the grounding transformer is neutral
Point；The data acquisition device is connect with the grounding transformer neutral point, for being carried out to the grounding transformer neutral point
Monitoring is to acquire the running state information of the grounding transformer.Earthing resistance cabinet 12 can pass through cable and grounding transformer 20
Connection, wherein the tie point of grounding transformer 20 and cable is grounding transformer neutral point.Herein it should be noted that this reality
It applies example to be not specifically limited the height of earthing resistance cabinet 12, the type of grounding transformer 20 is also not specifically limited, be grounded
Transformer 20 can be dry type node transformer, can also be other kinds of grounding transformer.The top of earthing resistance cabinet 12
Outlet sleeve can be provided with, wherein cable can reach earthing resistance cabinet by the laterally lower outlet of grounding transformer 20 through ground
The outlet sleeve of earthing resistance cabinet 12 is led to after 12 upwards.Herein it should also be noted that, data acquisition device 30 can with connect
Ground transformer neutral point connection, for being monitored ground connection transformer neutral point to acquire the operating status of grounding transformer 20
Information.
It can reach the neutral point to grounding transformer in real time by the attachment device in the utility model embodiment to carry out
The purpose of on-line monitoring, and then the connection type solved in the related technology between grounding transformer and earthing resistance cabinet is usually
Hard link is arranged by aluminium (copper), it will the technical issues of leading to not monitor the neutral point of grounding transformer on-line, to
Real time monitoring grounding transformer running state information is realized, and then improves the technique effect of the operational safety of grounding transformer.
The utility model uses a kind of mono- Y capacity transfer type principles of D, and using IGBT electronic switch modules as control, and realization is matched
The ideal operation of change.Mono- Y capacity transfer types primary sides of D are per being mutually a winding, and in large capacity, three-phase high-voltage is around being grouped into triangle
(D), when low capacity three-phase high-voltage around being grouped into star (Y).It is made of three parts per phase low pressure winding:When 27%, the number of turns
Line segment (I sections), the line segment of 73% the number of turns in addition is by two conducting wires and around into two groups (n, 111 sections), the section of every group of conducting wire
The about half in I section leads section.When large capacity n, m sections it is in parallel after connect again with I section, three sections of wholes are connected when low capacity.If
Low capacity is adjusted to by large capacity, low pressure winding the number of turns increases, and vice versa.At the same time, in Neutral Point Through Low Resistance system
In system, ground resistance limits single-phase earthing overvoltage multiple firstly the need of meeting, choose as possible the slightly larger ground resistance of resistance value with
Just occur smaller fault current occur when singlephase earth fault, while contact potential and step voltage can be reduced, reduction pair
The interference of communication, to reduce the safety and investment problem that the system reform is caused.Meanwhile gapless arrestyer is relatively suitble to make
In the power distribution network of Neutral Point Through Low Resistance, the switching overvoltage generated in system can not only be effectively limited, and
Lightning impulse overvoltage can be reduced, the dielectric level of system equipment can be thus reduced or existing equipment is made correspondingly to increase
Insulation margin is added, has extended service life, there is considerable economic benefit.After earth fault occurs for resonant earthed system,
Rational extinguishing arc control program is formulated according to the actual conditions of power grid, improves the arc extinguishing of arc suppression coil and the energy of electric power netting safe running
Power.The selection of ground resistance also needs to consider requirement, the zero sequence of over-voltage multiple in Neutral Point Through Low Resistance system
Protection sensitivity, to factors such as the interference of communication line and Electrical Safety, and according to various regions distribution concrete condition adaptation to local conditions.It is small
The case where resistance eutral grounding and grounding through arc are current most popular earthing modes, exclusive use has had accumulated a large amount of
Experience, when the two is comprehensive in use, control strategy appropriate, can select most suitable connect according to the importance of supply line
Ground mode improves power supply reliability.
Although being disclosed to the utility model by above example, the scope of protection of the utility model not office
It is limited to this, under conditions of conceiving without departing from the utility model, deformation, the replacement etc. done to above each component will fall into this
In the right of utility model.
Claims (9)
1. a kind of automatic capacity transfer type distribution transformer, which is characterized in that including high-voltage winding wiring mechanism and low pressure winding wiring
Mechanism, the high-voltage winding wiring mechanism include triangle connection circuitry and star-star connection circuit, the low pressure winding wiring mechanism
Including series wiring circuit and connection circuitry in parallel；Further include neutral point resistance grounding device and Arc suppression coil grounding device,
In, the Arc suppression coil grounding device includes grounding transformer fuel tank, arc suppression coil fuel tank, neutral from grounding transformer primary side
The cable that point is drawn and the cable drawn from arc suppression coil head end；The grounding transformer fuel tank and arc suppression coil fuel tank top are logical
Closing connecting cylinder lateral connection is crossed, connecting cylinder is interior filled with transformer oil, and middle part sets bellows, bellows and connecting cylinder both ends cylinder
Pass through flanged joint；Insulating support is equipped in cylinder, current-carrying connector is fixed on insulating support, and both ends pass through connector respectively
Device and the cable drawn from grounding transformer primary side neutral point and the cable connection drawn from arc suppression coil head end；Current-carrying connects
Fitting is made of internal hard metal conductor and external insulation.
2. automatic capacity transfer type distribution transformer according to claim 1, which is characterized in that capacity transfer type primary side per mutually for one around
Group.
3. automatic capacity transfer type distribution transformer according to claim 2, which is characterized in that the high-voltage winding wiring mechanism packet
Three-phase high-voltage winding is included, in large capacity, the three-phase high-voltage is around being grouped into delta connection circuit.
4. automatic capacity transfer type distribution transformer according to claim 2, which is characterized in that the high-voltage winding wiring mechanism packet
Three-phase high-voltage winding is included, in low capacity, the three-phase high-voltage is around being grouped into star-star connection circuit.
5. automatic capacity transfer type distribution transformer according to claim 2, which is characterized in that the low pressure winding wiring mechanism packet
Three-phase low-voltage winding is included, is made of three parts winding segments per phase low pressure winding, when large capacity, the second low pressure winding section is low with third
After pressing winding segments parallel connection, then connect again with the first low pressure winding section.
6. automatic capacity transfer type distribution transformer according to claim 2, which is characterized in that the low pressure winding wiring mechanism packet
Three-phase low-voltage winding is included, is made of three parts per phase low pressure winding, when low capacity, three groups of sections are all connected.
7. automatic capacity transfer type distribution transformer according to claim 5, which is characterized in that the line of the first low pressure winding section
The number of turns accounts for the 27% of whole low pressure winding wire turn.
8. automatic capacity transfer type distribution transformer according to claim 5, which is characterized in that the second low pressure winding Duan Yu
The sectional area of wire of three low pressure winding sections is the 1/2 of the first low pressure winding section lead sectional area.
9. automatic capacity transfer type distribution transformer according to claim 1, which is characterized in that the neutral point resistance grounding device
Including earthing resistance cabinet, grounding transformer and data acquisition device, wherein the grounding transformer is connect by cable with described
Ground resistance cabinet connects, and the tie point of the grounding transformer and the cable is the grounding transformer neutral point；The data
Harvester is connect with the grounding transformer neutral point, for being monitored the grounding transformer neutral point to acquire
The running state information of the grounding transformer.
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| CN201721243238.2U CN207637603U (en) | 2017-09-26 | 2017-09-26 | A kind of automatic capacity transfer type distribution transformer |
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| CN201721243238.2U CN207637603U (en) | 2017-09-26 | 2017-09-26 | A kind of automatic capacity transfer type distribution transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524953A (en) * | 2018-11-21 | 2019-03-26 | 许继变压器有限公司 | A kind of arc suppression coil |
| CN112951566A (en) * | 2021-02-03 | 2021-06-11 | 陕西省地方电力(集团)有限公司延安供电分公司 | High-frequency full-control switch turn-ratio-variable current-voltage self-control transformer |
| CN113936899A (en) * | 2021-10-15 | 2022-01-14 | 广东电网有限责任公司广州供电局 | Method and device for adjusting large current by tapping head |
-
2017
- 2017-09-26 CN CN201721243238.2U patent/CN207637603U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524953A (en) * | 2018-11-21 | 2019-03-26 | 许继变压器有限公司 | A kind of arc suppression coil |
| CN112951566A (en) * | 2021-02-03 | 2021-06-11 | 陕西省地方电力(集团)有限公司延安供电分公司 | High-frequency full-control switch turn-ratio-variable current-voltage self-control transformer |
| CN113936899A (en) * | 2021-10-15 | 2022-01-14 | 广东电网有限责任公司广州供电局 | Method and device for adjusting large current by tapping head |
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