CN114038667A - Seamless switching on-load voltage regulating transformer - Google Patents
Seamless switching on-load voltage regulating transformer Download PDFInfo
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- CN114038667A CN114038667A CN202111321906.XA CN202111321906A CN114038667A CN 114038667 A CN114038667 A CN 114038667A CN 202111321906 A CN202111321906 A CN 202111321906A CN 114038667 A CN114038667 A CN 114038667A
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- 230000001105 regulatory effect Effects 0.000 title claims description 9
- 238000004804 winding Methods 0.000 claims abstract description 180
- 238000010079 rubber tapping Methods 0.000 claims abstract description 49
- 230000009471 action Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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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
- 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
Abstract
The invention discloses a seamless switching on-load tap changer, which comprises split-phase windings, wherein each single-phase winding in the split-phase windings further comprises an auxiliary winding; the winding direction, the number of turns and a tap of the auxiliary winding are completely the same as those of the input winding; the tapping on the auxiliary winding is an auxiliary on-off tap; each input tapping is connected with the output end of the input on-off switch; each auxiliary tapping tap is connected with the output end of the auxiliary on-off switch; the input end of the input on-off switch is connected in parallel with the input end of the auxiliary on-off switch. Has the advantages that: an auxiliary winding is added on each phase winding, on-off switches are arranged on tap taps of the input winding and the auxiliary winding, and the on-load tap switches are replaced by sequentially switching on and off the on-off switches to realize on-load voltage regulation; the transformer has the advantages of high safety level, low failure rate, reliable action and long service life, and greatly reduces the cost of the on-load tap changer.
Description
The technical field is as follows:
the invention relates to the field of transformers, in particular to a seamless switching on-load tap changing transformer.
Background art:
the loss generated by the transmission of electric energy in the distribution network of the electric power system is the minimum value only near the rated voltage. The on-load voltage regulation is carried out, the voltage of the bus of the transformer is always kept qualified, so that the electrical equipment runs in a rated voltage state, the loss is reduced, and the method is most economical and reasonable.
The existing on-load voltage regulation is realized by an on-load tap-changer on an on-load voltage regulation transformer. The on-load tap-changer has the working principle that a plurality of tap-changers are led out from a winding of a transformer, and the on-load tap-changer is switched from an initial gear (namely one tap) to a target gear (namely the other tap) under the condition of ensuring that the load current is not cut off so as to change the effective number of turns of the winding, namely change the transformation ratio of the transformer. In short, "upshift" means downshift "means step-down," and "downshift" means upshift "means step-up. The core of the on-load tap-changer is that a transition circuit is adopted. The transition circuit is used for switching on the transition circuit (the current between two gears is limited by the transition resistor) when the moving contact of the switch is not completely separated from one gear, so that the transformer is ensured not to lose power, and when the moving contact reaches the other gear, the transition circuit is switched off, and the adjustment is completed.
The on-load tap-changer is a main component of the on-load tap-changer and is the only moving component in a high-voltage loop of the transformer, the fault rate of the on-load tap-changer is relatively high, and common faults comprise the faults of linkage fault of the tap-changer, refusal action of a change-over switch, out-of-limit fault of the tap-changer, oil leakage fault of an oil chamber, partial discharge of the tap-changer and the like. The application of the resistance type on-load tap-changer is common, the general structure of the resistance type on-load tap-changer can be divided into a control part, a transmission part, a switch part and the like, and the problems of complex structure, difficult maintenance and high maintenance cost after damage exist. Meanwhile, the on-load tap-changer is expensive, and with the increase of voltage class, the price of the on-load tap-changer-using on-load tap-changer is even hundreds of thousands to millions.
The invention content is as follows:
the invention aims to provide an on-load tap changer which is added with an auxiliary winding same as an input winding on each phase winding, wherein on-off switches are arranged on tap taps of the input winding and the auxiliary winding, and are sequentially opened and closed through the on-off switches to replace an on-load tap changer, so that on-load voltage regulation is realized.
The second purpose of the invention is to provide an on-load tap changer which is added with an auxiliary winding on each phase winding, wherein the auxiliary winding is the same as the regulating winding of the input winding, the tapping heads of the input winding and the auxiliary winding are provided with on-off switches, and the on-off switches are sequentially switched on and off to replace the on-load tap changer, so that the on-load voltage regulation seamless switching on-load tap changer is realized.
The invention is implemented by the following technical scheme:
the seamless switching on-load tap changer comprises split-phase windings, wherein each phase winding of the split-phase windings comprises an input winding and an output winding; the input winding is coupled with the output winding, a plurality of input tapping taps are led out of the input winding, the input winding further comprises a plurality of auxiliary on-off switches and a plurality of input on-off switches, each phase of winding further comprises an auxiliary winding, and the auxiliary winding is coupled with the output winding; the winding direction, the number of turns and the tap of the auxiliary winding are completely the same as those of the input winding; the tapping tap on the auxiliary winding is an auxiliary tapping tap; the input tapping switches are connected with the input on-off switches in a one-to-one corresponding mode, namely the input on-off switches are connected with the input tapping switches in the same number, and the auxiliary tapping switches are connected with the auxiliary on-off switches in a one-to-one corresponding mode, namely the auxiliary on-off switches are connected with the auxiliary tapping switches in the same number; the input end of the input on-off switch is connected with the input end of the auxiliary on-off switch in parallel; the end of the auxiliary winding is connected to the end of the input winding.
Preferably, each input tap is connected with the output end of only one corresponding input on-off switch; each auxiliary tapping tap is connected with the output end of one corresponding auxiliary on-off switch.
Preferably, all of the input on-off switches are interlocked, and all of the auxiliary on-off switches are interlocked.
The seamless switching on-load tap changer comprises split-phase windings, wherein each phase winding of the split-phase windings comprises an input winding and an output winding; the input winding is coupled with the output winding, the input winding comprises an adjusting winding and a main winding which are connected end to end, a plurality of input tapping taps are led out of the adjusting winding, the input winding also comprises a plurality of auxiliary on-off switches and a plurality of input on-off switches, each phase of winding also comprises an auxiliary winding, and the auxiliary winding is coupled with the adjusting winding; the winding direction, the number of turns and the tap of the auxiliary winding are completely the same as those of the adjusting winding; the tapping tap on the auxiliary winding is an auxiliary tapping tap; the input tapping switches are connected with the input on-off switches in a one-to-one corresponding mode, namely the input on-off switches are connected with the input tapping switches in the same number, and the auxiliary tapping switches are connected with the auxiliary on-off switches in a one-to-one corresponding mode, namely the auxiliary on-off switches are connected with the auxiliary tapping switches in the same number; the input end of the input on-off switch is connected with the input end of the auxiliary on-off switch in parallel; and the tail end of the auxiliary winding and the tail end of the regulating winding are simultaneously connected with the head end of the main winding.
Preferably, each input tap is connected with the output end of only one corresponding input on-off switch; each auxiliary tapping tap is connected with the output end of one corresponding auxiliary on-off switch.
Preferably, all of the input on-off switches are interlocked, and all of the auxiliary on-off switches are interlocked.
The invention has the advantages that: compared with the prior art, the on-load tap changer has the advantages that the auxiliary winding is added on each phase winding of the on-load tap changer, the on-off switches are arranged on the input winding and the tap taps of the auxiliary winding, and are sequentially and alternately opened and closed through the on-off switches with low price, so that the on-load tap changer is replaced, and the on-load voltage regulation is realized; when the input winding and the auxiliary winding are used for on-load voltage regulation, the on-off switches are equivalent to two resistors connected in parallel, the voltage difference between the on-off switches which are sequentially and alternately opened and closed is small, electric arcs generated by load current during switching are small, and the on-load voltage regulation process is safely finished; the on-off switch is easy to replace and maintain, high in safety level, low in failure rate, reliable in action and long in service life, and the cost of the on-load tap changer is greatly reduced.
Description of the drawings:
fig. 1 is an overall schematic diagram of a delta connection of a three-phase input winding in embodiment 1.
Fig. 2 is an overall schematic diagram of the star connection of the three-phase input winding in embodiment 1.
Fig. 3 is a schematic diagram of the connection of the input on-off switch, the auxiliary on-off switch 5 and the on-off controller in the present invention.
Fig. 4 is an overall schematic diagram of the delta connection of the three-phase input winding in embodiment 2.
Fig. 5 is an overall schematic diagram of the star connection of the three-phase input winding in embodiment 2.
Fig. 6 is a schematic diagram of the continuous operation of the input on-off switch and the auxiliary on-off switch to perform the downshift on-load voltage regulation.
Fig. 7 is a schematic diagram of the continuous operation of the input on-off switch and the auxiliary on-off switch for the shift-up on-load voltage regulation.
The transformer comprises an input winding 1, an output winding 2, an input tapping 11, an adjusting winding 12, a main winding 13, an auxiliary winding 3, an auxiliary on-off tap 31, an input on-off switch 4, an auxiliary on-off switch 5 and an on-off controller 6.
The specific implementation mode is as follows:
example 1: as shown in fig. 1, the seamless switching on-load tap changer includes three-phase windings, wherein each phase winding includes an input winding 1, an output winding 2, an auxiliary winding 3, a plurality of input on-off switches 4, a plurality of auxiliary on-off switches 5, and an on-off controller 6; the input winding 1 of the three-phase winding is connected in a triangular mode, or as shown in figure 2, the input winding 1 of the three-phase winding is connected in a star mode; the input winding 1 is coupled with the output winding 2, a plurality of input tapping taps 11 are led out from the input winding 1, and the auxiliary winding 3 is coupled with the output winding 2; the winding direction, the number of turns and the tap of the auxiliary winding 3 are completely the same as those of the input winding 1; the tapping on the auxiliary winding 3 is an auxiliary tapping 31; the input tapping switches 11 are respectively connected with the input on-off switches 4 in a one-to-one correspondence manner, namely the input on-off switches 4 and the input tapping switches 11 are the same in number; each input tap 11 is connected with the output end of only one corresponding input on-off switch 4, all the input on-off switches 4 are interlocked, and only one input on-off switch 4 can be closed; the auxiliary tapping taps 31 are connected with the auxiliary on-off switches 5 in a one-to-one correspondence manner, namely the auxiliary on-off switches 5 are the same in number as the auxiliary tapping taps 31, each auxiliary tapping 31 is connected with the output end of only one corresponding auxiliary on-off switch 5, all the auxiliary on-off switches 5 are interlocked, and only one auxiliary on-off switch 5 can be closed; as shown in fig. 3, the input on-off switch 4 and the auxiliary on-off switch 5 are both electrically connected to the on-off controller 6, and the on-off controller 6 controls the on-off of the input on-off switch 4 and the auxiliary on-off switch 5; an auxiliary winding 3 is added on each phase winding, on-off switches which are independently opened and closed are respectively arranged on tap taps of the input winding 1 and the auxiliary winding 3, and the on-off switches with low price are sequentially opened and closed to replace on-load tap switches, so that on-load voltage regulation is realized; the input end of the input on-off switch 4 is connected in parallel with the input end of the auxiliary on-off switch 5; the tail end of the auxiliary winding 3 is connected with the tail end of the input winding 1; the input end of the input on-off switch 4 connected with the auxiliary on-off switch 5 in parallel, and the tail end of the auxiliary winding 3 connected with the input winding 1 are respectively connected with the input end of each phase of winding; when the on-load voltage regulation is carried out, the input winding 1 and the auxiliary winding 3 are equivalent to two resistors connected in parallel, the pressure difference between the on-off switches which are sequentially and alternately opened and closed is small, the electric arc generated by the load current is small during switching, and the process of safely finishing the on-load voltage regulation is realized.
Example 2: as shown in fig. 4, a seamless switching on-load tap changer, an on-load tap changer, comprises three phase windings, wherein each phase winding comprises an input winding 1, an output winding 2, an auxiliary winding 3, a plurality of input on-off switches 4, a plurality of auxiliary on-off switches 5 and an on-off controller 6; the input winding 1 of the three-phase winding is connected in a triangle way, or as shown in figure 5, the input winding 1 of the three-phase winding is connected in a star way; the input winding 1 is coupled with the output winding 2, the input winding 1 comprises an adjusting winding 12 and a main winding 13 which are connected end to end, a plurality of input tapping taps 11 are led out of the adjusting winding 12, and the auxiliary winding 3 is coupled with the output winding 2; the winding direction, the number of turns and the tap of the auxiliary winding 3 are completely the same as those of the regulating winding 12; the tapping on the auxiliary winding 3 is an auxiliary tapping 31; the input tapping switches 11 are respectively connected with the input on-off switches 4 in a one-to-one correspondence manner, namely the input on-off switches 4 and the input tapping switches 11 are the same in number; each input tap 11 is connected with the output end of only one corresponding input on-off switch 4, all the input on-off switches 4 are interlocked, and only one input on-off switch 4 can be closed; the auxiliary tapping taps 31 are connected with the auxiliary on-off switches 5 in a one-to-one correspondence manner, namely the auxiliary on-off switches 5 are the same in number as the auxiliary tapping taps 31, each auxiliary tapping 31 is connected with the output end of only one corresponding auxiliary on-off switch 5, all the auxiliary on-off switches 5 are interlocked, and only one auxiliary on-off switch 5 can be closed; as shown in fig. 3, the input on-off switch 4 and the auxiliary on-off switch 5 are both electrically connected to the on-off switch controller 6, and the on-off switch 4 and the auxiliary on-off switch 5 are controlled to be opened and closed by the on-off switch controller 6; an auxiliary winding 3 is added on each phase winding, on-off switches which are independently opened and closed are respectively arranged on tap taps of the input winding 1 and the auxiliary winding 3, and the on-off switches with low price are sequentially opened and closed to replace on-load tap switches, so that on-load voltage regulation is realized; the input end of the input on-off switch 4 is connected in parallel with the input end of the auxiliary on-off switch 5; the tail end of the auxiliary winding 3 and the tail end of the regulating winding 12 are simultaneously connected with the head end of the main winding 13; the input end of the input on-off switch 4 and the auxiliary on-off switch 5 which are connected in parallel and the tail end of the main winding 13 are respectively connected with the input end of each phase of winding; when the on-load voltage regulation is carried out, the input winding 1 and the auxiliary winding 3 are equivalent to two resistors connected in parallel, the pressure difference between the on-off switches which are sequentially and alternately opened and closed is small, the electric arc generated by the load current is small during switching, and the process of safely finishing the on-load voltage regulation is realized.
Instructions for use: the single-phase on-load voltage regulation is taken as an example for explanation. After the on-off controller 6 receives a voltage regulating signal sent by an on-load voltage regulating controller in a power distribution network, the on-off controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 which are closed at the same time at the initial gear to be sequentially and alternately opened and closed towards the boosting direction or the voltage reducing direction; until the on-load voltage regulation controller stops sending the voltage regulation signal; after the on-off controller 6 controls the on-load voltage regulation to be finished, the same gear input on-off switch 4 and the auxiliary on-off switch 5 are always kept to be simultaneously closed.
Specifically, as shown in fig. 6, after the on-off controller 6 receives a downshift voltage regulation signal from the on-load voltage regulation controller in the power distribution network, taking single-phase downshift from the a3 gear as an example: before the on-off controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 to regulate the voltage towards the A1 gear position, the input on-off switch 4 and the corresponding auxiliary on-off switch 5 on the A3 gear position are in a simultaneous closed state; when the on-off controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 to carry out on-load voltage regulation towards the A1 gear direction, the on-off controller 6 firstly controls the auxiliary on-off switch 5 on the A3 gear to be switched off, then controls the auxiliary on-off switch 5 on the A2 gear to be switched on, then controls the input on-off switch 4 on the A3 gear to be switched off, and finally controls the input on-off switch 4 on the A2 gear to be switched on; completing the load adjustment process of the first-gear voltage; at the moment, the on-load voltage regulation controller detects the voltage of the output winding 2, when the voltage of the output winding 2 reaches the voltage value required by the on-load voltage regulation controller, the downshift voltage regulation process is completed, if the detected voltage value is still high, the adjustment is required to be continued, the steps are repeatedly completed until the required voltage value is adjusted, and the downshift on-load voltage regulation process is completed.
As shown in fig. 7, after the on-off controller 6 receives the up-shift voltage regulation signal from the on-load voltage regulation controller in the power distribution network, taking single-phase up-shift from a2 gear as an example: before the on-off controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 to regulate the voltage in the direction of An gear, the input on-off switch 4 and the corresponding auxiliary on-off switch 5 at the A2 gear are in a simultaneous closed state; when the on-off controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 to carry out on-load voltage regulation towards An A gear direction, the on-off controller 6 firstly controls the auxiliary on-off switch 5 on An A2 gear to be switched off, then controls the auxiliary on-off switch 5 on An A3 gear to be switched on, then controls the input on-off switch 4 on An A2 gear to be switched off, and finally controls the input on-off switch 4 on An A2 gear to be switched on; completing the load adjustment process of the first-gear voltage; at the moment, the on-load voltage regulation controller detects the voltage of the output winding 2, when the voltage of the output winding 2 reaches the voltage value required by the on-load voltage regulation controller, the downshift voltage regulation process is completed, if the detected voltage value is still high, the adjustment is required to be continued, the steps are repeatedly completed until the required voltage value is adjusted, and the downshift on-load voltage regulation process is completed.
Claims (6)
1. The seamless switching on-load tap changer comprises split-phase windings, wherein each phase winding of the split-phase windings comprises an input winding and an output winding; the input winding is coupled with the output winding, and a plurality of input tapping taps are led out from the input winding; the winding direction, the number of turns and the tap of the auxiliary winding are completely the same as those of the input winding; the tapping tap on the auxiliary winding is an auxiliary tapping tap; the input tapping joints are respectively connected with the input on-off switches in a one-to-one corresponding mode, and the auxiliary tapping joints are connected with the auxiliary on-off switches in a one-to-one corresponding mode; the input end of the input on-off switch is connected with the input end of the auxiliary on-off switch in parallel; the end of the auxiliary winding is connected to the end of the input winding.
2. The seamlessly switched on-load tap changing transformer of claim 1, wherein each of the input tap taps is connected to an output terminal of only a corresponding one of the input on-off switches; each auxiliary tapping tap is connected with the output end of one corresponding auxiliary on-off switch.
3. The seamlessly switched on-load tap changer of any of claims 1 or 2, wherein all of the input on-off switches are interlocked and all of the auxiliary on-off switches are interlocked.
4. The seamless switching on-load tap changer comprises split-phase windings, wherein each phase winding of the split-phase windings comprises an input winding and an output winding; the input winding is coupled with the output winding, the input winding comprises an adjusting winding and a main winding which are connected end to end, and a plurality of input tapping taps are led out from the adjusting winding; the winding direction, the number of turns and the tap of the auxiliary winding are completely the same as those of the adjusting winding; the tapping tap on the auxiliary winding is an auxiliary tapping tap; the input tapping joints are respectively connected with the input on-off switches in a one-to-one corresponding mode, and the auxiliary tapping joints are connected with the auxiliary on-off switches in a one-to-one corresponding mode; the input end of the input on-off switch is connected with the input end of the auxiliary on-off switch in parallel; and the tail end of the auxiliary winding and the tail end of the regulating winding are simultaneously connected with the head end of the main winding.
5. The seamlessly switched on-load tap changing transformer of claim 4, wherein each of the input tap taps is connected to an output terminal of only a corresponding one of the input on-off switches; each auxiliary tapping tap is connected with the output end of one corresponding auxiliary on-off switch.
6. The seamlessly switched on-load tap changer of any of claims 4 or 5, wherein all of the input on-off switches are interlocked and all of the auxiliary on-off switches are interlocked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111321906.XA CN114038667A (en) | 2021-11-09 | 2021-11-09 | Seamless switching on-load voltage regulating transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111321906.XA CN114038667A (en) | 2021-11-09 | 2021-11-09 | Seamless switching on-load voltage regulating transformer |
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| CN114038667A true CN114038667A (en) | 2022-02-11 |
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| CN202111321906.XA Pending CN114038667A (en) | 2021-11-09 | 2021-11-09 | Seamless switching on-load voltage regulating transformer |
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| GB749317A (en) * | 1952-07-24 | 1956-05-23 | Electricite De France | Improvements in transformer on-load tap-changing equipment |
| GB1216691A (en) * | 1967-01-21 | 1970-12-23 | Licentia Gmbh | An on-load tap-changing switch |
| SU1095154A1 (en) * | 1982-11-01 | 1984-05-30 | Горьковский Ордена Трудового Красного Знамени Политехнический Институт Им.А.А.Жданова | Device for adjusting voltage of transformer under load |
| JPS60140712A (en) * | 1983-12-28 | 1985-07-25 | Toshiba Corp | On-load tap changing transformer |
| CN101325124A (en) * | 2008-04-24 | 2008-12-17 | 中国农业大学 | Tapping switch for load voltage-regulating transformer and voltage-regulating transformer using the same |
| CN105632727A (en) * | 2014-11-25 | 2016-06-01 | 王海 | On-load tap-changer of transformer and on-load tap changing transformer |
| CN205828118U (en) * | 2016-07-19 | 2016-12-21 | 浙江群力电气有限公司 | A kind of distribution transformer |
| CN210469151U (en) * | 2019-07-15 | 2020-05-05 | 浙江宝威电气有限公司 | Interleaved parallel seven-gear transformer on-load voltage regulation circuit with polarity conversion |
| CN112735790A (en) * | 2020-12-21 | 2021-04-30 | 山东电工电气集团有限公司 | Power electronic on-load voltage regulation distribution transformer and voltage regulation method thereof |
| CN213242222U (en) * | 2020-10-16 | 2021-05-18 | 王振铎 | On-load seamless regulation power transformer |
| JP2021175274A (en) * | 2020-04-24 | 2021-11-01 | 株式会社ダイヘン | Load-time tap switch and voltage control device |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB749317A (en) * | 1952-07-24 | 1956-05-23 | Electricite De France | Improvements in transformer on-load tap-changing equipment |
| GB1216691A (en) * | 1967-01-21 | 1970-12-23 | Licentia Gmbh | An on-load tap-changing switch |
| SU1095154A1 (en) * | 1982-11-01 | 1984-05-30 | Горьковский Ордена Трудового Красного Знамени Политехнический Институт Им.А.А.Жданова | Device for adjusting voltage of transformer under load |
| JPS60140712A (en) * | 1983-12-28 | 1985-07-25 | Toshiba Corp | On-load tap changing transformer |
| CN101325124A (en) * | 2008-04-24 | 2008-12-17 | 中国农业大学 | Tapping switch for load voltage-regulating transformer and voltage-regulating transformer using the same |
| CN105632727A (en) * | 2014-11-25 | 2016-06-01 | 王海 | On-load tap-changer of transformer and on-load tap changing transformer |
| CN205828118U (en) * | 2016-07-19 | 2016-12-21 | 浙江群力电气有限公司 | A kind of distribution transformer |
| CN210469151U (en) * | 2019-07-15 | 2020-05-05 | 浙江宝威电气有限公司 | Interleaved parallel seven-gear transformer on-load voltage regulation circuit with polarity conversion |
| JP2021175274A (en) * | 2020-04-24 | 2021-11-01 | 株式会社ダイヘン | Load-time tap switch and voltage control device |
| CN213242222U (en) * | 2020-10-16 | 2021-05-18 | 王振铎 | On-load seamless regulation power transformer |
| CN112735790A (en) * | 2020-12-21 | 2021-04-30 | 山东电工电气集团有限公司 | Power electronic on-load voltage regulation distribution transformer and voltage regulation method thereof |
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Effective date of registration: 20240108 Address after: 135099 Group 30, Fifth Committee, Xinhua Street, Meihekou City, Tonghua City, Jilin Province Applicant after: Wang Zhenduo Address before: 014300 East Road, 300m south of the intersection of de Ao line heavy lane and Minzu Road, fengshuiliang Park, Dalat banner, Ordos City, Inner Mongolia Autonomous Region Applicant before: Inner Mongolia Gerui Transformer Co.,Ltd. |