CN108899183A - A kind of loading capacitance-regulating distribution transformer and corresponding capacity transfer method - Google Patents
A kind of loading capacitance-regulating distribution transformer and corresponding capacity transfer method Download PDFInfo
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- CN108899183A CN108899183A CN201810738624.1A CN201810738624A CN108899183A CN 108899183 A CN108899183 A CN 108899183A CN 201810738624 A CN201810738624 A CN 201810738624A CN 108899183 A CN108899183 A CN 108899183A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
- H02P13/06—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changing; by rearranging interconnections of windings
Abstract
The embodiment of the present application discloses a kind of loading capacitance-regulating distribution transformer and corresponding capacity transfer method, wherein the loading capacitance-regulating distribution transformer, including：Capacity transfer component, height, which are pressed with, carries adjuster, low-voltage loaded adjuster, measuring device and control device, the capacity transfer component is pressed with load adjuster with height respectively and low-voltage loaded adjuster is connect, the height, which is pressed with, to be carried adjuster and low-voltage loaded adjuster and connect respectively with control device, the measuring device respectively in electric system current transformer and the control device connect.It is pressed with load adjuster by control device control height, so that the height, which is pressed with, carries regulator operations high-low pressure winding, the number of turns, the number of plies and/or height by changing high-low pressure winding force down the spacing between the coil of winding to realize the loaded capacity-regulated of distribution transformer；The failure rate of distribution transformer is effectively reduced, meanwhile, it is just pressed in load adjuster and is additionally provided with buffer unit, reduce the generation of electric arc.
Description
Technical field
This application involves electric power system power distribution field more particularly to a kind of loading capacitance-regulating distribution transformer and corresponding capacity transfers
Method.
Background technique
The electricity consumption period of rural areas in our country includes electricity consumption busy season and electricity consumption dull season, and when being in the electricity consumption busy season, distribution becomes
Depressor is usually run under overload, and when being in electricity consumption dull season, the rate of load condensate of distribution transformer is lower, it could even be possible to leading
It causes distribution transformer to run in the unloaded state, that is, the phenomenon that " low load with strong power " occurs.Distribution transformer is overloading for a long time
Under state using and it is serious using distribution transformer can all be lost in the unloaded state.And city electricity consumption is even more that there are electricity consumption peaks
The electricity consumption difference of Gu Qi, peak times of power consumption and low power consumption phase are obvious, and rotation is frequent, reliable to the power supply of distribution transformer
Property require it is higher.It is therefore desirable to which distribution transformer reasonably adjusts the capacity of distribution transformer, i.e., according to power consumption characteristics in time
Capacity transfer is carried out to distribution transformer, reduces the loss of distribution transformer, to improve the operational efficiency of distribution transformer.
Capacity transfer is carried out to distribution transformer currently, generalling use loaded capacity-regulated mode.Wherein, pass through loaded capacity-regulated mode
To distribution transformer carry out capacity transfer when, do not need disconnect distribution transformer power supply, distribution transformer in normal operation,
The load-carrying capacity for adjusting distribution transformer.In addition, carrying out the distribution transformer usually quilt of capacity transfer using loaded capacity-regulated mode
Referred to as loading capacitance-regulating distribution transformer.
Existing loading capacitance-regulating distribution transformer mainly by controller, high-voltage winding, low pressure winding, high pressure combination switch and
Low-voltage combination switch composition.High-voltage winding is made of one section of coil, and low pressure winding is made of three sections of coils, i.e. I section of coil, II section
Coil and III section of coil, wherein the Ith section of coil is identical as the IIth section of cross section of coil, is the IIIth section of coil section
50%, it is the 73% of the total number of turns of three sections of coils when the number of turns parallel connection of the Ith section and the IIth section coil, the number of turns of third section coil accounts for
The 27% of the total number of turns of three sections of coils.Existing loading capacitance-regulating distribution transformer is using the height by changing distribution transformer
The connection type of winding is pressed to change the capacity of distribution transformer.When needing distribution transformer to provide large capacity, high-voltage winding
It is connected into triangle (corner connection), the I section coil of low pressure winding is connected with the IIIth section of coil again with the IIth section of coils from parallel connection of coils；It is needing
When distribution transformer provides low capacity, high-voltage winding is connected into star (star connects), the Ith section of coil, the IIth section of coil of low pressure winding
It all connects with the IIIth section of coil.During the capacity transfer of loading capacitance-regulating distribution transformer, controlled by high-low pressure combination switch
The connection type of high-low pressure winding, wherein high-voltage winding is connect with 6 loaded capacity-regulated high pressure combination switches, is distinguished by controller
Control the connection type of this 6 loaded capacity-regulated high pressure combination switch control high-voltage windings, low pressure winding and 9 loaded capacity-regulated low pressure
Combination switch connection is controlled the connection type of this 9 loaded capacity-regulated low-voltage combination switch control low pressure windings by controller respectively,
Therefore need to employ the capacity regulating that 15 high-low pressure combination switches complete distribution transformer simultaneously during loaded capacity-regulated.
But inventor has found in the research process of the application, existing loading capacitance-regulating distribution transformer is in capacity transfer mistake
It is higher that at least 15 high-low pressure combination switches, failure rate is employed in journey simultaneously.
Summary of the invention
This application provides a kind of loading capacitance-regulating distribution transformers and corresponding capacity transfer method, to solve in the prior art,
This higher problem of loading capacitance-regulating distribution transformer failure rate during capacity transfer.
In a first aspect, the embodiment of the present application provides a kind of loading capacitance-regulating distribution transformer, the loaded capacity-regulated distribution transformer
Device includes：
Capacity transfer component, height, which are pressed with, carries adjuster, low-voltage loaded adjuster, measuring device and control device；
The capacity transfer component is pressed with load adjuster with the height respectively and the low-voltage loaded adjuster is connect, the high pressure
Have and carry adjuster and the low-voltage loaded adjuster and connect respectively with the control device, the measuring device respectively with power train
Current transformer and control device connection in system；
The capacity transfer component, is made of high-voltage winding, low pressure winding and iron core；
The height is pressed with load adjuster, for operating the high-voltage winding, make the number of turns of the high-voltage winding, the number of plies and/
Or the spacing between the coil of the high-voltage winding changes；
The low-voltage loaded adjuster, for operating the low pressure winding, make the number of turns of the low pressure winding, the number of plies and/
Or the spacing between the coil of the low pressure winding changes；
The measuring device is sent to control dress for the information of real-time monitoring parameters of electric power system, and by the information
It sets, the information is used to characterize the electricity consumption situation of electric system；
The control device is pressed with for according to receiving information, controlling the height and carries adjuster and described low-voltage loaded
Adjuster carries described in high-voltage winding described in regulator operations and the low-voltage loaded regulator operations so that the height is pressed with
Low pressure winding, to realize the loaded capacity-regulated of distribution transformer.
With reference to first aspect, in one implementation, the high-voltage winding in the capacity transfer component is located at by described
Iron core side, by height be respectively L,WithThree layer line circles composition, join end to end, successively arrange from inside to outside, wherein
The coil turn that height is L is N, is highlyCoil turn be N, be highlyCoil turn be 2N；
The low pressure winding is located on the outside of the high-voltage winding, by being highly respectivelyWith three layers of coil group of L
At joining end to end, successively arrange from inside to outside, wherein being highlyCoil turn be 2N, be highlyCoil turn
It is highly N for the coil turn of L for N.
With reference to first aspect, in one implementation, the coil in the high-voltage winding highly for L is uniformly divided into 3 sections,
Every section of umber of turn isLine footpath is S；Highly it is in the high-voltage windingCoil be divided into 2 sections, upper section the number of turns is
Lower section the number of turns isLine footpath isHighly it is in the high-voltage windingUmber of turn be 2N, line footpath is
With reference to first aspect, in one implementation, the coil in the low pressure winding highly for L is uniformly divided into 3 sections,
Every section of umber of turn isLine footpath is S；Highly it is in the low pressure windingCoil be divided into 2 sections, upper section the number of turns is
Lower section the number of turns isLine footpath isHighly it is in the low pressure windingUmber of turn be 2N, line footpath is
With reference to first aspect, in one implementation, the high-voltage winding includes at least eight high-voltage winding tap, institute
High-voltage winding tap is stated for operating the coil of the high-voltage winding；
The low pressure winding includes at least eight low pressure winding tap, and the low pressure winding tap is for operating the low pressure
The coil of winding.
With reference to first aspect, in one implementation, the height, which is pressed with, carries adjuster by high-pressure side moving contact, high-pressure side
Static contact, high-pressure side buffer unit and the first operating mechanism composition, first operating mechanism include：Motor and transmission shaft；
The high-pressure side static contact is connected with high-voltage winding tap；The high-pressure side moving contact and high-pressure side output end phase
Connection；
The high-pressure side buffer unit is for reducing high-pressure side static contact and institute of the high-voltage winding tap in handoff procedure
The electric arc of generation.
With reference to first aspect, in one implementation, the low-voltage loaded adjuster is by low-pressure side moving contact, low-pressure side
Static contact, low-pressure side buffer unit and second operation machine structure composition；
The low-pressure side static contact is connect with low pressure winding tap, and the low-pressure side moving contact is connected with low-pressure side output end
It connects；
The low-pressure side buffer unit is for reducing low-pressure side static contact and institute of the low pressure winding tap in handoff procedure
The electric arc of generation.
With reference to first aspect, in one implementation, the height is pressed with load adjuster and is located on low-voltage loaded adjuster
Portion；
First operating mechanism and second operation machine structure are the same operating mechanism.
With reference to first aspect, in one implementation, when the height is pressed with the high-pressure side static contact connection of load adjuster
In high-voltage winding tap H11 and high-voltage winding tap H14, or it is connected to high-voltage winding tap H11 and high-voltage winding tap H21,
The low-pressure side static contact of the low-voltage loaded adjuster is connected to low pressure winding tap L11 and low pressure winding tap L14, or connection
In low pressure winding tap L11 and low pressure winding tap L21, distribution transformer capacity 1.0SN；
When the high-pressure side static contact that the height is pressed with load adjuster is connected to high-voltage winding tap H12 and high-voltage winding tap
H23, or it is connected to high-voltage winding tap H12 and high-voltage winding tap H31, the low-pressure side static contact of the low-voltage loaded adjuster
It is connected to low pressure winding tap L12 and low pressure winding tap L23, or is connected to low pressure winding tap l12 and low pressure winding tap
When L21, distribution transformer capacity 0.6SN；
When the high-pressure side static contact that the height is pressed with load adjuster is connected to high-voltage winding tap H13 and high-voltage winding tap
H32, when the low-pressure side static contact of the low-voltage loaded adjuster is connected to low pressure winding tap L13 and low pressure winding tap L32,
Distribution transformer capacity is 0.3SN；
Wherein, SNFor rated capacity.
Second aspect, the embodiment of the present application part provides a kind of capacity transfer method of loading capacitance-regulating distribution transformer, described
Method is applied to the described in any item loading capacitance-regulating distribution transformers of claim 1 to 9, which is characterized in that described loaded capacity-regulated
The capacity transfer method of distribution transformer includes：
The information of measuring device real-time monitoring parameters of electric power system in loading capacitance-regulating distribution transformer, and information is sent
To the control device in loading capacitance-regulating distribution transformer；
Control device in loading capacitance-regulating distribution transformer analyze in real time current parameters of electric power system whether meet have load adjust
The condition of appearance, when meeting loaded capacity-regulated condition, the control device controls described loaded capacity-regulated according to preset control strategy
Height in distribution transformer, which is pressed with, carries adjuster and low-voltage loaded adjuster, so that the height, which is pressed with, carries height described in regulator operations
Low pressure winding described in winding and the low-voltage loaded regulator operations is pressed, to realize the loaded capacity-regulated of distribution transformer.
From the above technical scheme, a kind of loading capacitance-regulating distribution transformer provided by the embodiments of the present application and corresponding tune
Appearance method.The wherein loading capacitance-regulating distribution transformer, including：Capacity transfer component, height, which are pressed with, carries adjuster, low-voltage loaded adjusting
Device, measuring device and control device, the capacity transfer component is pressed with load adjuster with height respectively and low-voltage loaded adjuster is connect, institute
State height and be pressed with and carry adjuster and low-voltage loaded adjuster and connect respectively with control device, the measuring device respectively with electric system
In current transformer and control device connection, height controlled by control device be pressed with and carry adjuster and low-voltage loaded tune
Save device so that the height be pressed with carry it is low described in high-voltage winding and the low-voltage loaded regulator operations described in regulator operations
Winding is pressed, the number of turns, the number of plies and/or the height by changing high-low pressure winding force down the spacing between the coil of winding to realize
Distribution transformer it is loaded capacity-regulated；Meanwhile being just pressed with to carry in adjuster and being additionally provided with buffer unit, reduce the production of electric arc
It is raw.
It height only need to be operated by control device using loading capacitance-regulating distribution transformer of the invention be pressed with and carry adjuster and low
The capacity transfer of distribution transformer can be realized by being pressed with load adjuster, effectively reduce the failure rate of distribution transformer.
Further, according to power consumption characteristics, loading capacitance-regulating distribution transformer of the invention can be subtracted with adjust automatically capacity gear
The loss of few distribution transformer.There are three the capacity regulating functions of gear, it can be achieved that in 1.0S for present invention toolN、0.6SNAnd 0.3SN
It is run under three kinds of capacity, increases buffer unit, it is possible to reduce the generation of electric arc.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of loading capacitance-regulating distribution transformer provided by the embodiments of the present application；
Fig. 2 is in a kind of loading capacitance-regulating distribution transformer provided by the embodiments of the present application, high-voltage winding and low pressure winding
Structural schematic diagram；
Fig. 3 is that height, which is pressed with, carries adjuster and low pressure in a kind of loading capacitance-regulating distribution transformer provided by the embodiments of the present application
The top view of controller structure；
Fig. 4 is low-voltage loaded adjuster and low pressure in a kind of loading capacitance-regulating distribution transformer provided by the embodiments of the present application
The top view of controller structure；
Fig. 5 is that height, which is pressed with, carries adjuster and low pressure in a kind of loading capacitance-regulating distribution transformer provided by the embodiments of the present application
The cross-sectional view of controller structure；
Fig. 6 is a kind of capacity transfer method schematic diagram of loading capacitance-regulating distribution transformer provided by the embodiments of the present application.
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing and it is specific real
Applying mode, the present application will be further described in detail.
In order to solve in the prior art, this higher problem of loading capacitance-regulating distribution transformer failure rate during capacity transfer,
This application provides a kind of loading capacitance-regulating distribution transformers and corresponding capacity transfer method.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the embodiment of the present application shows a kind of loading capacitance-regulating distribution transformer
Structural schematic diagram is specifically included such as flowering structure referring to Fig.1：
A kind of loading capacitance-regulating distribution transformer includes：Capacity transfer component 101, height, which are pressed with, carries adjuster 102, low-voltage loaded adjusting
Device 103, measuring device 104 and control device 105；
The capacity transfer component 101 is pressed with load adjuster 102 with height respectively and low-voltage loaded adjuster 103 is connect, the height
Be pressed with and carry adjuster 102 and low-voltage loaded adjuster 103 and connect respectively with control device 105, the measuring device 104 respectively with
Current transformer and the control device 105 in electric system connect；
The capacity transfer component 101 is made of high-voltage winding 1011, low pressure winding 1012 and iron core 1013；
Wherein, the height is pressed with load adjuster 102 and connect with the high-voltage winding 1011, the low-voltage loaded adjuster
103 are connected with the low pressure winding 1012, and the current transformer in electric system is the electric current letter for induction power system
Breath belongs to a part of electric system composition；
In addition, high-voltage winding 1011 is located at close to the side of iron core 1013, low pressure winding 1012 is located at high-voltage winding 1011
Outside, iron core is used to enhance the magnetic field of high-voltage winding 1011 and low pressure winding 1012.
The height, which is pressed with load adjuster 102, makes the circle of the high-voltage winding 1011 for operating the high-voltage winding 1011
Spacing between the coil of number, the number of plies and/or the high-voltage winding 1011 changes；
The low-voltage loaded adjuster 103, for operating the low pressure winding 1012, make low pressure winding 1012 the number of turns,
Spacing between the coil of the number of plies and/or the low pressure winding 1012 changes；
Wherein, height is pressed with load adjuster 102 and operates the high-voltage winding 1011, and the number of turns of high-voltage winding 1011 can be made to send out
It is raw to change, the number of plies of high-voltage winding 1011 can also be made to change, between can also making between the coil of high-voltage winding 1011
Away from changing；Meanwhile the high load adjuster 102 that is pressed with can also make the number of turns of high-voltage winding 1011 and the number of plies all change,
So that the spacing between the number of turns and coil of high-voltage winding 1011 is all changed, makes between the number of plies and coil of high-voltage winding 1011
Spacing all change, make the coil of the number of turns of high-voltage winding 1011, the number of plies of high-voltage winding 1011 and high-voltage winding 1011
Between spacing all change；
Equally, low-voltage loaded adjuster 103 operates the low pressure winding 1012, and the number of turns of low pressure winding 1012 can be made to send out
It is raw to change, the number of plies of low pressure winding 1012 can also be made to change, between can also making between the coil of low pressure winding 1012
Away from changing；Meanwhile low-voltage loaded adjuster 103 can also make the number of turns of low pressure winding 1012 and the number of plies all change,
So that the spacing between the number of turns and coil of low pressure winding 1012 is all changed, makes between the number of plies and coil of low pressure winding 1012
Spacing all change, make the number of turns of low pressure winding 1012,1012 number of plies of low pressure winding and low pressure winding 1012 coil it
Between spacing all change；
In addition, spacing between the coil of either high-voltage winding 1011 change or 1012 coil of low pressure winding between
Spacing changes or the distance of the coil of high-voltage winding 1011 and low pressure winding 1012 all changes, and can all cause
Spacing between high-voltage coil and low-voltage coil changes.
The measuring device 104 is sent to control for the information of real-time monitoring parameters of electric power system, and by the information
Device 105, the information are used to characterize the electricity consumption situation of electric system；
Wherein, the parameter information of 104 real-time monitoring electric system of measuring device, when guaranteeing that parameters of electric power system changes
It can timely feedback to the control device 105, control device 105 adjusts the capacity of distribution transformer, the power train in time
System parameter information include：The information such as electric current, voltage and the load of electric system.
The control device 105 is pressed with for according to receiving information, controlling the height and carries adjuster 102 and described low
It is pressed with and carries adjuster 103, so that the height is pressed with and carries adjuster 102 and operate the high-voltage winding 1011 and the low pressure and have
It carries adjuster 103 and operates the low pressure winding 1012, to realize the loaded capacity-regulated of distribution transformer.
Wherein, the control device 105 includes at least CPU element, analog channel, signal path, control channel and protection
Channel, the analog channel are connected with the measuring device 104, and the control channel and the height are pressed with and carry adjuster 103
It is connected, the protection channel is connected with system circuit breaker.
Also, CPU element is for being implanted into control strategy, the analog channel, for receiving the power train of measuring device 104
System parameter information；The signal path, the status information for being pressed with load adjuster 103 for receiving height；The control channel is used
In issuing the supreme low-voltage loaded adjuster 103 of capacity transfer order；The protection channel, for protecting the control device 105.
The parameter information that the electric system of measuring device 104 is received by analog channel, when the parameter of the electric system
When being unsatisfactory for the parameter of current capacities setting, it is logical to send commands to control for the capacity switchover policy being previously implanted by CPU element
Road, control channel issue height described in capacity transfer bid value again and are pressed with load adjuster 102 and low-voltage loaded adjuster 103, realize distribution
Transformer capacity transfer, signal path receive height and are pressed with the status information for carrying adjuster 102 and low-voltage loaded adjuster 103, feed back to
CPU element, protection channel are connect with system short-circuit device, when the failure of control device 105, can disconnect control device 105 immediately
Connection, realize protection control device 105 purpose.
A kind of loading capacitance-regulating distribution transformer provided by the embodiments of the present application, including：Capacity transfer component 101, height are pressed with load and adjust
Save device 102, low-voltage loaded adjuster 103, measuring device 104 and control device 105, the capacity transfer component 101 respectively with high pressure
Have and carry adjuster 102 and the connection of low-voltage loaded adjuster 103, the height, which is pressed with, carries adjuster 102 and low-voltage loaded adjuster 103
Connect respectively with control device 105, the measuring device 104 respectively in electric system current transformer and the control
Device 105 connects, and controls height by control device 105 and is pressed with load adjuster 102 and low-voltage loaded adjuster 103, so that described
Height be pressed with carry adjuster 102 operate the high-voltage winding 1011 and the low-voltage loaded adjuster 103 operate the low pressure around
Group 1012, by change high-low pressure winding 1012 the number of turns, the number of plies and/or the height force down the spacing between the coil of winding with
Realize the loaded capacity-regulated of distribution transformer, the loading capacitance-regulating distribution transformer of the application need to only operate height and be pressed with load adjuster 102
With low-voltage loaded adjuster 103, can solve in the prior art, loading capacitance-regulating distribution transformer during capacity transfer failure rate compared with
High problem.
Referring to shown in Fig. 2, the loop construction and connection schematic diagram of high-voltage winding 1011 and low pressure winding 1012：
The high-voltage winding 1011 in the capacity transfer component 101, which is located at, leans on 1013 side of iron core, respectively by height
For L,WithThree layer line circle H1、H2And H3Composition, joins end to end, successively arranges from inside to outside, wherein height is the line of L
Circle the number of turns is N1, highly it isCoil turn be N1, highly it isCoil turn be 2N1；
The low pressure winding 1012 is located at 1011 outside of high-voltage winding, by being highly respectivelyWith the three of L
Layer line circle L1、L2And L3Composition, joins end to end, successively arranges from inside to outside, wherein being highlyCoil turn be 2N2, high
Degree isCoil turn be N2, it is highly N for the coil turn of L2。
Coil in the high-voltage winding 1011 highly for L is uniformly divided into 3 sections, and every section of umber of turn isLine footpath is
S；Highly it is in the high-voltage winding 1011Coil be divided into 2 sections, upper section the number of turns isLower section the number of turns isLine footpath
ForHighly it is in the high-voltage winding 1011Umber of turn be 2N1, line footpath is
Coil in the low pressure winding 1012 highly for L is uniformly divided into 3 sections, and every section of umber of turn isLine footpath is S；
Highly it is in the low pressure winding 1012Coil be divided into 2 sections, upper section the number of turns isLower section the number of turns isLine footpath isHighly it is in the low pressure winding 1012Umber of turn be 2N2, line footpath is
Wherein, S is the line footpath area of coil.
The high-voltage winding 1011 includes 1011 tap of at least eight high-voltage winding, and 1011 tap of high-voltage winding is used for
Operate the coil of the high-voltage winding 1011；
The low pressure winding 1012 includes 1012 tap of at least eight low pressure winding, and 1012 tap of low pressure winding is used for
Operate the coil of the low pressure winding 1012.
Wherein, in the embodiment of the present application, 8 high-voltage windings, 1011 tap includes：Tap H11, H12, H13, H14,
H21, H23, H31 and H32,1011 tap H14 and H21 of high-voltage winding is in the same position, 1011 tap H23, H31 of high-voltage winding
In the same position；
8 low pressure windings, 1012 tap includes：Tap L11, L12, L13, L14, L21, L23, L31 and L32, low pressure
1012 tap L14 and L21 of winding is in the same position in the same position, low pressure winding 1012 tap L23 and L31；
In addition, H1Three sections of coils of winding, are sequentially connected to high-pressure side tap H11, H12 and H13, H from top to bottom1Winding
And H2The junction of winding is connected to tap H14, H2Winding is connected to tap H23, H3Winding is connected to H32；
L1Three sections of coils of winding, are sequentially connected to high-pressure side tap L11, L12 and L13, H from top to bottom1Winding and L2Around
The junction of group is connected to tap L14, L2Winding is connected to tap L23, L3Winding is connected to L32.
Referring to shown in Fig. 3, the height be pressed with carry adjuster 102 by high-pressure side moving contact 1021, high-pressure side static contact 1022,
High-pressure side buffer unit 1023 and the first operating mechanism 1024 composition；
The high-pressure side static contact 1022 is connected with 1011 tap of high-voltage winding, the high-pressure side moving contact 1021 and height
Pressure side output end is connected；
The high-pressure side buffer unit was switching for reducing high-pressure side static contact 1022 and 1011 tap of high-voltage winding
Generated electric arc in journey.
Wherein, the first operating mechanism 1024 is located at the middle position that height is pressed with load adjuster 102, high-pressure side static contact 1022
It is connect with high-pressure side moving contact 1021 with the first operating mechanism 1024, high-pressure side static contact is driven by the first operating mechanism 1024
1022 switchings being connect with 1011 tap of high-voltage winding.
Referring to shown in Fig. 4, the low-voltage loaded adjuster 103 by low-pressure side moving contact 1031, low-pressure side static contact 1032,
Low-pressure side buffer unit 1033 and second operation machine structure 1034 form；
The low-pressure side static contact 1032 is connect with 1012 tap of low pressure winding, the low-pressure side moving contact 1031 and low pressure
Side output end is connected；
The low-pressure side buffer unit was switching for reducing low-pressure side static contact 1032 and 1012 tap of low pressure winding
Generated electric arc in journey.
Wherein, second operation machine structure 1034 is located at the middle position of low-voltage loaded adjuster 103, low-pressure side static contact 1032
It is connect with low-pressure side moving contact 1031 with second operation machine structure 1034, low-pressure side static contact is driven by second operation machine structure 1034
1032 switchings being connect with 1012 tap of low pressure winding.
Referring to Figure 5, first operating mechanism 1024 includes：Motor 10241 and transmission shaft 10242, the high pressure
There is load adjuster 102 to be located at low-voltage loaded 103 upper position of adjuster, height, which is pressed with, carries adjuster 102 and low-voltage loaded tune
Save the transmission shaft 10242 that the public same motor 10241 of device 103 drives, i.e. the first operating mechanism 1024 and second operation machine structure
1034 be the same operating mechanism, and the arrow that height is pressed with the high-pressure side moving contact 1021 of load adjuster 102 is directed toward defeated with high-pressure side
Outlet is connected, and the arrow direction of high-pressure side static contact 1022 is connected with high-voltage winding 1011, low-voltage loaded adjuster 103
The arrow direction of low-pressure side moving contact 1031 is connected with low-pressure side output end, the arrow of low-pressure side static contact 1032 be directed toward be with
Low pressure winding 1012 is connected, and high-pressure side buffer unit 1023 is arranged in high-pressure side moving contact 1021 and high-pressure side static contact 1022
Switching position, the electric arc generated for reducing high-voltage contact switching, the setting of low-pressure side buffer unit 1033 is in the dynamic touching of low-pressure side
First 1031 and low-pressure side static contact 1032 switching position, for reduce low-voltage contact switching generate electric arc.
Wherein, height, which is pressed with, carries adjuster 102 and the public same operating mechanism of low-voltage loaded adjuster 103, to guarantee
Distribution transformer capacity gear switch process mesohigh has the synchronism for carrying adjuster 102 and low-voltage loaded adjuster 103, because
Asynchronous 1012 output voltage of low pressure winding that will will cause of high and low pressure side substantially increases or reduces, and causes not to power system load
The influence of benefit；
Further, when the high-pressure side static contact 1022 that the height is pressed with load adjuster 102 is connected to high-voltage winding 1011
1011 tap H14 of tap H11 and high-voltage winding, or it is connected to 1011 tap H11 of high-voltage winding and 1011 tap of high-voltage winding
H21, the low-pressure side static contact 1032 of the low-voltage loaded adjuster 103 be connected to 1012 tap L11 of low pressure winding and low pressure around
When organizing 1012 tap L14, or being connected to low pressure winding 1012 groups of tap L11 and 1012 tap L21 of low pressure winding, distribution transformer
Capacity is 1.0SN；
When the height be pressed with carry adjuster 102 high-pressure side static contact 1022 be connected to 1011 tap H12 of high-voltage winding and
1011 tap H23 of high-voltage winding, or it is connected to 1011 tap H31 of 1011 tap H12 of high-voltage winding and high-voltage winding, the low pressure
There is the low-pressure side static contact 1032 for carrying adjuster 103 to be connected to 1012 tap L12 of low pressure winding and 1012 tap of low pressure winding
L23, or when being connected to low pressure winding 1012 tap l12 and 1012 tap L21 of low pressure winding, distribution transformer capacity 0.6SN；
When the height be pressed with carry adjuster 102 high-pressure side static contact 1022 be connected to 1011 tap H13 of high-voltage winding and
1011 tap H32 of high-voltage winding, the low-pressure side static contact 1032 of the low-voltage loaded adjuster 103 are connected to low pressure winding 1012
When 1012 tap L32 of tap L13 and low pressure winding, distribution transformer capacity 0.3SN；
Wherein, SNFor rated capacity.
In addition, 1011 tap H11 of high-voltage winding and 1011 tap H14 of high-voltage winding be on same straight line, high-voltage winding
1011 tap H11 and 1011 tap H21 of high-voltage winding are on same straight line, 1012 tap L11 of low pressure winding and low pressure winding
1012 tap L14 are on same straight line, and L11 and 1012 tap L21 of low pressure winding are on same straight line, high-voltage winding 1011
Tap H12 and 1011 tap H23 of high-voltage winding are on same straight line, 1012 tap L11 of low pressure winding and low pressure winding 1012
Tap L21 on same straight line, 1011 tap H12 of high-voltage winding and 1011 tap H23 of high-voltage winding on same straight line,
1011 tap H12 of high-voltage winding and 1011 tap H31 of high-voltage winding on same straight line, 1012 tap L12 of low pressure winding and
On same straight line, 1012 tap l12 of low pressure winding and 1012 tap L21's 1012 tap L23 of low pressure winding of low pressure winding exist
On same straight line, 1011 tap H13 of high-voltage winding and 1011 tap H32 of high-voltage winding are on same straight line, low pressure winding
1012 tap L13 and 1012 tap L32 of low pressure winding are on same straight line.
Since high-voltage winding 1011 tap H14 and H21 are in the same position, at high-voltage winding 1011 tap H23 or H31
In the same position, low pressure winding 1012 tap L14 and L21 are in the same position, low pressure winding 1012 tap L23 and L31
It is in the same position, so distribution transformer capacity is 1.0SNWhen have following four connection method：The first：When the height
Be pressed with and carry the high-pressure side static contact 1022 of adjuster 102 and be connected to tap H11 and H14, the low-voltage loaded adjuster 103 it is low
Pressure side static contact 1032 is connected to voltage tap L11 and L14；Second：When the high-pressure side that the height is pressed with load adjuster 102 is quiet
Contact 1022 is connected to high-voltage tap H11 and H21, and the low-pressure side static contact 1032 of the low-voltage loaded adjuster 103 is connected to
Voltage tap L11 and L21, the third：It is taken out when the high-pressure side static contact 1022 that the height is pressed with load adjuster 102 is connected to high pressure
Head H11 and H14, the low-pressure side static contact 1032 of the low-voltage loaded adjuster 103 are connected to voltage tap L11 and L21；4th
Kind：When the high-pressure side static contact 1022 that the height is pressed with load adjuster 102 is connected to high-voltage tap H11 and H21, the low pressure has
The low-pressure side static contact 1032 for carrying adjuster 103 is connected to voltage tap L11 and L14；
Similarly, so distribution transformer capacity is 0.6SNWhen have following several connection methods：The first：When the high pressure
There is the high-pressure side static contact 1022 for carrying adjuster 102 to be connected to tap H12 and H23, the low pressure of the low-voltage loaded adjuster 103
Side static contact 1032 is connected to tap L12 and L23；Second：When the height is pressed with the high-pressure side static contact of load adjuster 102
1022 are connected to tap H12 and H31, the low-pressure side static contact 1032 of the low-voltage loaded adjuster 103 be connected to tap L12 and
L31, the third：When the height be pressed with carry adjuster 102 high-pressure side static contact 1022 be connected to tap H12 and H23, it is described low
The low-pressure side static contact 1032 for being pressed with load adjuster 103 is connected to tap L12 and L31；4th kind：It is adjusted when the height is pressed with load
The high-pressure side static contact 1022 of device 102 is connected to tap H12 and H31, the low-pressure side static contact of the low-voltage loaded adjuster 103
1032 are connected to tap L12 and L23.
For example, when the high-pressure side static contact 1022 that the height is pressed with load adjuster 102 is connected to 1011 tap of high-voltage winding
H11 and H14, the low-pressure side static contact 1032 of the low-voltage loaded adjuster 103 be connected to 1012 tap L11 of low pressure winding and
When L14, distribution transformer is operated under declared working condition state, transformer capacity 1.0SN, high and low pressure side voltage ratio is specified electricity
Pressure ratio is approximately equal to
When the height be pressed with carry adjuster 102 high-pressure side static contact 1022 be connected to 1011 tap H12 of high-voltage winding and
H23, when the low-pressure side static contact 1032 of the low-voltage loaded adjuster 103 is connected to 1012 tap L12 and L23 of low pressure winding,
1011 the number of turns of high-voltage winding becomes1012 the number of turns of low pressure winding becomesTransformer voltage ratio is constant, is approximately equal toRoot
According to formula U=4.44fNBmS (wherein U system voltage, f are frequency, and N is the number of turns of high-voltage winding 1011 or low pressure winding 1012,
BmFor the maximum flux density of iron core 1013, S is 1013 sectional area of iron core) it is found that in the case where U, f and S are constant, increase winding turns
Number, reduces 1013 flux density of iron core, therefore 1013 no-load loss of iron core can be effectively reduced, is equivalent to the appearance for reducing transformer
Amount, flux density reduce multiple and areTransformer capacity is 0.6SN；
When the high-pressure side static contact 1022 that the height is pressed with load adjuster 102 is connected to tap H13 and H32, the low pressure
When having the low-pressure side static contact 1032 for carrying adjuster 103 to be connected to tap L13 and L32,1011 the number of turns of high-voltage winding becomes1012 the number of turns of low pressure winding becomesTransformer voltage ratio is constant, is approximately equal toFlux density reduces multipleBecome
Depressor capacity is 0.3SN；
Wherein, the voltage ratio during loading capacitance-regulating distribution transformer of the application is in capacity transfer remains constant, by
As can be seen that it can be with by the number of turns for increasing distribution transformer high-voltage winding 1011 and low pressure winding 1012 in above-mentioned voltage equation
Keep voltage than constant.
The embodiment of the present application tool can by the connection of static contact and different taps there are three the capacity regulating function of gear
It realizes in 1.0SN、0.6SNAnd 0.3SNIt runs, while the application increases buffer unit, can effectively reduce under three kinds of capacity
The generation of electric arc.
Embodiment 1, the loading capacitance-regulating distribution transformer of the application, which can also be realized, keeps distribution transformer in capacity transfer process
In short-circuit impedance it is constant；
Change be will increase while distribution transformer increases the number of turns with voltage device short-circuit impedance, the embodiment of the present application can lead to
Crossing the distance between the winding height for reducing distribution transformer and coil can keep the short-circuit impedance constant；
It is according to distribution transformer short-circuit impedance percentageMatched by reducing
The thickness of piezoelectric transformer winding and the distance a and coil average length mlt for reducing between high and low pressure side coil offset due to around
Group the number of turns increases and increased short-circuit impedance, guarantees that distribution transformer short-circuit impedance all remains unchanged under any capacity, wherein
K is the constant depending on the system of unit used, and F is the number of turns of coil, and a is 1011 inside of high-voltage winding and 1012 outside of low pressure winding
Distance, b be 1012 coil thickness of low pressure winding, c be 1011 coil thickness of high-voltage winding, mlt be coil average length,For
1013 total magnetic flux maximum value of iron core, I are the rated current of coil；
In addition, 1013 total magnetic flux maximum value of iron core and rated current are fixed value, 1013 total magnetic flux maximum value of iron core according to
The model of iron core 1013 determines that rated current is determined according to the capacity of system.
Referring to Fig. 6, the embodiment of the present application part provides a kind of capacity transfer method of loading capacitance-regulating distribution transformer, this method
Applied to the loading capacitance-regulating distribution transformer, the capacity transfer method of the loading capacitance-regulating distribution transformer includes：
Step S11, the information of the measuring device real-time monitoring parameters of electric power system in loading capacitance-regulating distribution transformer, and will
Information is sent to the control device in the loading capacitance-regulating distribution transformer；
Step S12, whether the control device in loading capacitance-regulating distribution transformer analyzes current parameters of electric power system in real time full
The loaded capacity-regulated condition of foot；
Step S13, when meeting loaded capacity-regulated condition, the control device is according to preset control strategy, described in control
Height in loading capacitance-regulating distribution transformer, which is pressed with, carries adjuster and low-voltage loaded adjuster, so that the height, which is pressed with, carries adjuster behaviour
Make low pressure winding described in the high-voltage winding and the low-voltage loaded regulator operations, has load with realize distribution transformer
Capacity transfer.
Wherein, loaded capacity-regulated condition is when being greater than the capacity gear bands value of setting, then system controller controls height
It is pressed with and carries adjuster progress capacity transformation adjusting；
For example, distribution transforming rated capacity is 100kVA, it is 55kVA that capacity, which switches middle gear definite value, and capacity is switched to low-grade location
Definite value is 25kVA, and distribution transformer load is in 55kVA or more, such as institute 80kVA, operates in 1.0SNGear, when distribution transformer load becomes
When 50kVA, the definite value 55kVA of middle gear has been less than it, has been switched to 0.6S at this timeNGear operation, when distribution transformer load is in 15kVA
When, less than the definite value of low-grade location, then it is switched to 0.3SN。
Measuring device in the loading capacitance-regulating distribution transformer of the application sends the parameter of the electric system of real-time measurement
To control device, the capacity of the timely parameter regulation transformer according to electric system in control device, therefore, the application can be real
Now according to power consumption characteristics, the loss of distribution transformer can be reduced with adjust automatically capacity gear.
Above-described the application embodiment does not constitute the restriction to the application protection scope.
Claims (10)
1. a kind of loading capacitance-regulating distribution transformer, which is characterized in that including：
Capacity transfer component, height, which are pressed with, carries adjuster, low-voltage loaded adjuster, measuring device and control device；
The capacity transfer component is pressed with load adjuster with the height respectively and the low-voltage loaded adjuster is connect, and the height is pressed with load
Adjuster and the low-voltage loaded adjuster are connect with the control device respectively, and the measuring device is respectively and in electric system
Current transformer and the control device connection；
The capacity transfer component, is made of high-voltage winding, low pressure winding and iron core；
The height is pressed with load adjuster, for operating the high-voltage winding, makes the number of turns, the number of plies and/or institute of the high-voltage winding
The spacing stated between the coil of high-voltage winding changes；
The low-voltage loaded adjuster makes the number of turns, the number of plies and/or institute of the low pressure winding for operating the low pressure winding
The spacing stated between the coil of low pressure winding changes；
The measuring device is sent to control device for the information of real-time monitoring parameters of electric power system, and by the information, institute
Information is stated for characterizing the electricity consumption situation of electric system；
The control device is pressed with load adjuster and the low-voltage loaded adjusting for according to information is received, controlling the height
Device, so that the height, which is pressed with, carries low pressure described in high-voltage winding described in regulator operations and the low-voltage loaded regulator operations
Winding, to realize the loaded capacity-regulated of distribution transformer.
2. loading capacitance-regulating distribution transformer according to claim 1, which is characterized in that
The high-voltage winding in the capacity transfer component, which is located at, leans on the iron core side, by height be respectively L,WithThree
Layer line circle composition, joins end to end, successively arranges from inside to outside, wherein the coil turn that height is L is N, is highlyCoil
The number of turns is N, is highlyCoil turn be 2N；
The low pressure winding is located on the outside of the high-voltage winding, by being highly respectivelyIt is formed with the three layer line circles of L, it is first
Tail is connected, and successively arranges from inside to outside, wherein being highlyCoil turn be 2N, be highlyCoil turn be N, it is high
The coil turn that degree is L is N.
3. loading capacitance-regulating distribution transformer according to claim 2, which is characterized in that
Coil in the high-voltage winding highly for L is uniformly divided into 3 sections, and every section of umber of turn isLine footpath is S；
Highly it is in the high-voltage windingCoil be divided into 2 sections, upper section the number of turns isLower section the number of turns isLine footpath is
Highly it is in the high-voltage windingUmber of turn be 2N, line footpath is
4. loading capacitance-regulating distribution transformer according to claim 3, which is characterized in that
Coil in the low pressure winding highly for L is uniformly divided into 3 sections, and every section of umber of turn isLine footpath is S；
Highly it is in the low pressure windingCoil be divided into 2 sections, upper section the number of turns isLower section the number of turns isLine footpath is
Highly it is in the low pressure windingUmber of turn be 2N, line footpath is
5. loading capacitance-regulating distribution transformer according to claim 1, which is characterized in that
The high-voltage winding includes at least eight high-voltage winding tap, and the high-voltage winding tap is for operating the high-voltage winding
Coil；
The low pressure winding includes at least eight low pressure winding tap, and the low pressure winding tap is for operating the low pressure winding
Coil.
6. loading capacitance-regulating distribution transformer according to claim 5, which is characterized in that
The height, which is pressed with, carries adjuster by high-pressure side moving contact, high-pressure side static contact, high-pressure side buffer unit and the first operation machine
Structure composition, first operating mechanism include：Motor and transmission shaft；
The high-pressure side static contact is connected with the high-voltage winding tap；The high-pressure side moving contact and high-pressure side output end phase
Connection；
Produced by the high-pressure side buffer unit is for reducing high-pressure side static contact and high-voltage winding tap in handoff procedure
Electric arc.
7. loading capacitance-regulating distribution transformer according to claim 5, which is characterized in that
The low-voltage loaded adjuster is by low-pressure side moving contact, low-pressure side static contact, low-pressure side buffer unit and second operation machine
Structure composition；
The low-pressure side static contact is connect with low pressure winding tap, and the low-pressure side moving contact is connected with low-pressure side output end；
Produced by the low-pressure side buffer unit is for reducing low-pressure side static contact and low pressure winding tap in handoff procedure
Electric arc.
8. loading capacitance-regulating distribution transformer according to claim 6 or 7, which is characterized in that
The height is pressed with load adjuster and is located at the low-voltage loaded adjuster top；
First operating mechanism and second operation machine structure are the same operating mechanism.
9. loading capacitance-regulating distribution transformer according to claim 8, which is characterized in that
When the height be pressed with carry adjuster high-pressure side static contact be connected to high-voltage winding tap H11 and high-voltage winding tap H14,
Or it is connected to high-voltage winding tap H11 and high-voltage winding tap H21, the low-pressure side static contact connection of the low-voltage loaded adjuster
In low pressure winding tap L11 and low pressure winding tap L14, or it is connected to low pressure winding tap L11 and low pressure winding tap L21
When, distribution transformer capacity 1.0SN；
When the height be pressed with carry adjuster high-pressure side static contact be connected to high-voltage winding tap H12 and high-voltage winding tap H23,
Or it is connected to high-voltage winding tap H12 and high-voltage winding tap H31, the low-pressure side static contact connection of the low-voltage loaded adjuster
In low pressure winding tap L12 and low pressure winding tap L23, or it is connected to low pressure winding tap l12 and low pressure winding tap L21
When, distribution transformer capacity 0.6SN；
When the height be pressed with carry adjuster high-pressure side static contact be connected to high-voltage winding tap H13 and high-voltage winding tap H32,
When the low-pressure side static contact of the low-voltage loaded adjuster is connected to low pressure winding tap L13 and low pressure winding tap L32, distribution
Transformer capacity is 0.3SN；
Wherein, SNFor rated capacity.
10. a kind of capacity transfer method of loading capacitance-regulating distribution transformer, the method is applied to described in any one of claim 1 to 9
Loading capacitance-regulating distribution transformer, which is characterized in that the capacity transfer method of the loading capacitance-regulating distribution transformer includes：
The information of measuring device real-time monitoring parameters of electric power system in loading capacitance-regulating distribution transformer, and sent information to
Carry the control device in capacity transfer distribution transformer；
Control device in loading capacitance-regulating distribution transformer analyze in real time current parameters of electric power system whether meet it is loaded capacity-regulated
Condition, when meeting loaded capacity-regulated condition, the control device controls the loaded capacity-regulated distribution according to preset control strategy
Height in transformer, which is pressed with, carries adjuster and low-voltage loaded adjuster, so that the height, which is pressed with, carries high voltage winding described in regulator operations
Low pressure winding described in group and the low-voltage loaded regulator operations, to realize the loaded capacity-regulated of distribution transformer.
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| CN201170985Y (en) * | 2008-01-10 | 2008-12-24 | 北京电研华源电力技术有限公司 | Combination switch for on-load capacity-regulating distributing transformer and distributing transformer thereof |
| CN102013307A (en) * | 2010-06-02 | 2011-04-13 | 李晓慧 | On-load capacity-regulation distributing transformer |
| CN202159568U (en) * | 2011-04-27 | 2012-03-07 | 中国电力科学研究院 | Three-level on-load adjusting capacity distribution transformer |
| CN103268814A (en) * | 2013-04-24 | 2013-08-28 | 辽宁金立电力电器有限公司 | Transformer on-load capacity-regulating voltage-regulating tap changer |
| CN106158307A (en) * | 2015-04-01 | 2016-11-23 | 贵州聚龙达科技有限公司 | A kind of controlled capacity transfer distribution transformer |
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2018
- 2018-07-06 CN CN201810738624.1A patent/CN108899183B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201170985Y (en) * | 2008-01-10 | 2008-12-24 | 北京电研华源电力技术有限公司 | Combination switch for on-load capacity-regulating distributing transformer and distributing transformer thereof |
| CN102013307A (en) * | 2010-06-02 | 2011-04-13 | 李晓慧 | On-load capacity-regulation distributing transformer |
| CN202159568U (en) * | 2011-04-27 | 2012-03-07 | 中国电力科学研究院 | Three-level on-load adjusting capacity distribution transformer |
| CN103268814A (en) * | 2013-04-24 | 2013-08-28 | 辽宁金立电力电器有限公司 | Transformer on-load capacity-regulating voltage-regulating tap changer |
| CN106158307A (en) * | 2015-04-01 | 2016-11-23 | 贵州聚龙达科技有限公司 | A kind of controlled capacity transfer distribution transformer |
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