CN114038667B - Seamless switching on-load voltage regulating transformer - Google Patents
Seamless switching on-load voltage regulating transformer Download PDFInfo
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- CN114038667B CN114038667B CN202111321906.XA CN202111321906A CN114038667B CN 114038667 B CN114038667 B CN 114038667B CN 202111321906 A CN202111321906 A CN 202111321906A CN 114038667 B CN114038667 B CN 114038667B
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 30
- 238000004804 winding Methods 0.000 claims abstract description 177
- 238000010079 rubber tapping Methods 0.000 claims abstract description 70
- 238000000034 method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a seamless switching on-load voltage regulating transformer, which comprises split-phase windings, wherein each single-phase winding in the split-phase windings also comprises an auxiliary winding; the winding direction, the number of turns and the tapping 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 on-off tap; each input tapping tap 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 with the input end of the auxiliary on-off switch in parallel. The advantages are that: an auxiliary winding is added on each phase winding, on-off switches are arranged on tapping taps of the input winding and the auxiliary winding, and the on-off switches are sequentially opened and closed to replace an on-load tapping switch, so that on-load voltage regulation is realized; high safety level, low failure rate, reliable action and long service life, and greatly reduces the cost of the on-load voltage regulating transformer.
Description
Technical field:
the invention relates to the field of transformers, in particular to a seamless switching on-load voltage regulating transformer.
The background technology is as follows:
the loss generated by the transmission of electrical energy in the distribution network of the power system is minimal only around the rated voltage. The on-load voltage regulation is carried out, so that the voltage of the bus of the transformer is always kept to be qualified, the electric equipment is operated 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 through an on-load tap changer on an on-load voltage regulating transformer. The working principle of the on-load tap-changer is that a plurality of tap-changer taps are led out from windings of a transformer, and under the condition of ensuring that load current is not cut off, the on-load tap-changer is switched from a starting gear (i.e. one tap-changer tap) to a target gear (i.e. the other tap-changer tap) so as to achieve the effective turns of the windings, namely the transformer ratio of the transformer is changed. Simply "up-turn=down-shift=down-shift", "down-turn=up-shift=up-shift". 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 the two gears is limited by the transition resistor) when the moving contact of the switch does not completely leave from the first gear, so as to ensure that the transformer is not powered off, and switching off the transition circuit after the moving contact reaches the other gear, so that the regulation is completed.
The on-load tap changer is a main component of the on-load voltage regulating transformer, is the only moving component in a high-voltage loop of the transformer, and has relatively high fault rate, and common faults comprise faults of tap changer linkage faults, switch failure, tap changer out-of-limit faults, oil leakage faults of an oil chamber, partial discharge of the tap changer and the like. The resistance type on-load tap-changer is generally applied, the overall 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 resistance type on-load tap-changer has the problems of complex structure, difficult maintenance and high maintenance cost after damage. Meanwhile, the on-load tap-changer is expensive, and the price of the on-load tap-changer is even hundreds of thousands to millions as the voltage class is increased.
The invention comprises the following steps:
The first object of the invention is to provide a seamless switching on-load tap-changer which is characterized in that an auxiliary winding which is the same as an input 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-changer is replaced by the on-off switches which are sequentially opened and closed, so that on-load voltage regulation is realized.
The second object of the invention is to provide a seamless switching on-load tap-changer which is characterized in that an auxiliary winding which is the same as a regulating winding of an input 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-off switches are sequentially opened and closed to replace the on-load tap-changer, so that on-load voltage regulation is realized.
The invention is implemented by the following technical scheme:
The seamless switching on-load voltage regulating transformer 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 is led out of a plurality of input tapping taps, 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 tapping tap of the auxiliary winding are identical to those of the input winding; the tapping tap on the auxiliary winding is an auxiliary tapping tap; the plurality of input tapping taps are respectively connected with the plurality of input on-off switches in a one-to-one correspondence manner, namely the input on-off switches are tapped with the input, the number of taps is the same, and the plurality of auxiliary tapping taps are connected with the plurality of auxiliary on-off switches in a one-to-one correspondence manner, namely the auxiliary on-off switches are the same as the auxiliary tapping taps in 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 of the input tap-off switches 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 the 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 voltage regulating transformer 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, the adjusting winding is led out to form a plurality of input tapping taps, 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 adjusting winding; the winding direction, the number of turns and the tapping tap of the auxiliary winding are identical to those of the regulating winding; the tapping tap on the auxiliary winding is an auxiliary tapping tap; the plurality of input tapping taps are respectively connected with the plurality of input on-off switches in a one-to-one correspondence manner, namely the input on-off switches are tapped with the input, the number of taps is the same, and the plurality of auxiliary tapping taps are connected with the plurality of auxiliary on-off switches in a one-to-one correspondence manner, namely the auxiliary on-off switches are the same as the auxiliary tapping taps in 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 and the end of the regulating winding are simultaneously connected with the head end of the main winding.
Preferably, each of the input tap-off switches 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 the 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-off switch is arranged on the tapping tap of the input winding and the auxiliary winding, and the on-off switch is sequentially and alternately switched on and off by the low-cost on-off switch to replace the on-load tapping switch so as to realize on-load voltage regulation; when the load voltage is regulated, the input winding and the auxiliary winding are equivalent to two parallel resistors, the pressure difference between the on-off switches which are alternately opened and closed in turn is smaller, the load current generates smaller electric arc during switching, and the process of load voltage regulation is completed safely; 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 voltage regulating transformer is greatly reduced.
Description of the drawings:
fig. 1 is an overall schematic diagram of the delta connection of the three-phase input winding in embodiment 1.
Fig. 2 is a schematic diagram of the three-phase input winding of embodiment 1 in a star connection.
Fig. 3 is a schematic diagram of connection of the input on-off switch, the auxiliary on-off switch 5 and the on-off switch 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 three-phase input winding of embodiment 2 in a star connection.
Fig. 6 is a schematic diagram of continuous operation of the input on-off switch and the auxiliary on-off switch for down-shifting on-load voltage regulation.
Fig. 7 is a schematic diagram of continuous operation of the input on-off switch and auxiliary on-off switch for upshifting on-load voltage regulation.
Input winding 1, output winding 2, input tapping 11, regulating winding 12, main winding 13, auxiliary winding 3, auxiliary on-off tapping 31, input on-off switch 4, auxiliary on-off switch 5, on-off switch controller 6.
The specific embodiment is as follows:
Example 1: as shown in fig. 1, the seamless switching on-load voltage regulating transformer 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 switch controller 6; the input winding 1 of the three-phase winding is a triangle connection method, or as shown in figure 2, the input winding 1 of the three-phase winding is a star connection method; the input winding 1 is coupled with the output winding 2, a plurality of input tapping taps 11 are led out of 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 tapping tap of the auxiliary winding 3 are identical to those of the input winding 1; the tapping tap on the auxiliary winding 3 is an auxiliary tapping tap 31; the input tapping taps 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 taps 11 are the same in number; each input tapping 11 is connected with the output end of a corresponding one of the input on-off switches 4, all the input on-off switches 4 are interlocked, and only one of the input on-off switches 4 is 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 tap 31 is connected with the output end of only one corresponding auxiliary on-off switch 5, all auxiliary on-off switches 5 are interlocked, and meanwhile, 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 electrically connected with an on-off switch controller 6, and the on-off switch 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 tapping taps of the input winding 1 and the auxiliary winding 3, and the on-load tapping switches are replaced by the on-load tapping switches through the on-off switches which are low in price and low in cost, so that on-load voltage regulation is realized; the input end of the input on-off switch 4 is connected with the input end of the auxiliary on-off switch 5 in parallel; the end of the auxiliary winding 3 is connected with the end of the input winding 1; 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 auxiliary winding 3 connected with the input winding 1 are respectively connected with the input end of each phase of winding; when the load voltage is regulated, the input winding 1 and the auxiliary winding 3 are equivalent to two parallel resistors, the pressure difference between the on-off switches which are alternately opened and closed in sequence is smaller, the load current generates smaller arc during switching, and the process of safely completing the load voltage regulation is realized.
Example 2: as shown in fig. 4, the on-load tap changer is seamlessly switched, and 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 switch controller 6; the input winding 1 of the three-phase winding is a triangle connection method, or as shown in fig. 5, the input winding 1 of the three-phase winding is a star connection method; 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, the adjusting winding 12 is led out of a plurality of input tapping taps 11, and the auxiliary winding 3 is coupled with the output winding 2; the winding direction, the number of turns and the tapping tap of the auxiliary winding 3 are identical to those of the regulating winding 12; the tapping tap on the auxiliary winding 3 is an auxiliary tapping tap 31; the input tapping taps 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 taps 11 are the same in number; each input tapping 11 is connected with the output end of a corresponding one of the input on-off switches 4, all the input on-off switches 4 are interlocked, and only one of the input on-off switches 4 is 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 tap 31 is connected with the output end of only one corresponding auxiliary on-off switch 5, all auxiliary on-off switches 5 are interlocked, and meanwhile, 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 electrically connected with an on-off switch controller 6, and the on-off switch 4 and the auxiliary on-off switch 5 are controlled to be turned on or off 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 tapping taps of the input winding 1 and the auxiliary winding 3, and the on-load tapping switches are replaced by the on-load tapping switches through the on-off switches which are low in price and low in cost, so that on-load voltage regulation is realized; the input end of the input on-off switch 4 is connected with the input end of the auxiliary on-off switch 5 in parallel; 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 load voltage is regulated, the input winding 1 and the auxiliary winding 3 are equivalent to two parallel resistors, the pressure difference between the on-off switches which are alternately opened and closed in sequence is smaller, the load current generates smaller arc during switching, and the process of safely completing the load voltage regulation is realized.
Description of use: take single-phase on-load voltage regulation as an example. After the on-off switch controller 6 receives a voltage regulating signal sent by the on-load voltage regulating controller in the power distribution network, the on-off switch controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 which are simultaneously closed at the initial gear to be sequentially and alternately opened and closed in the boosting direction or the reducing direction; until the on-load voltage regulating controller stops sending out the voltage regulating signal; after the on-load voltage regulation is controlled by the on-off switch controller 6, the same gear input on-off switch 4 and the auxiliary on-off switch 5 are always kept closed at the same time.
Specifically, as shown in fig. 6, when the on-off switch controller 6 receives a downshift voltage regulation signal sent by the on-load voltage regulation controller in the power distribution network, a single-phase downshift from A3 is taken as an example: before the on-off switch controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 to regulate the voltage in the A1 gear direction, the input on-off switch 4 on the A3 gear and the corresponding auxiliary on-off switch 5 are in a simultaneous closing state; when the on-off switch controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 to have load voltage regulation towards the A1 gear direction, the on-off switch controller 6 firstly controls the auxiliary on-off switch 5 on the A3 gear to be opened, then controls the auxiliary on-off switch 5 on the A2 gear to be closed, then controls the input on-off switch 4 on the A3 gear to be opened, and finally controls the input on-off switch 4 on the A2 gear to be closed; completing the on-load adjustment process of the first-gear voltage; at this time, the on-load voltage-regulating 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-regulating controller, the down-shift voltage-regulating process is completed, if the detected voltage value is still high, the adjustment is needed to be continued, and the steps are repeated until the voltage value is adjusted to the required voltage value, so that the down-shift on-load voltage-regulating process is completed.
As shown in fig. 7, when the on-off switch controller 6 receives the upshift voltage regulating signal sent by the on-load voltage regulating controller in the power distribution network, a single-phase upshift from A2 is taken as an example: before the on-off switch controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 to regulate the voltage in the direction of the An gear, the input on-off switch 4 on the A2 gear and the corresponding auxiliary on-off switch 5 are in a simultaneous closing state; when the on-off switch controller 6 controls the input on-off switch 4 and the auxiliary on-off switch 5 to have load voltage regulation towards the direction of An gear, the on-off switch controller 6 firstly controls the auxiliary on-off switch 5 on the A2 gear to be opened, then controls the auxiliary on-off switch 5 on the A3 gear to be closed, then controls the input on-off switch 4 on the A2 gear to be opened, and finally controls the input on-off switch 4 on the A2 gear to be closed; completing the on-load adjustment process of the first-gear voltage; at this time, the on-load voltage-regulating 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-regulating controller, the down-shift voltage-regulating process is completed, if the detected voltage value is still high, the adjustment is needed to be continued, and the steps are repeated until the voltage value is adjusted to the required voltage value, so that the down-shift on-load voltage-regulating process is completed.
Claims (6)
1. The seamless switching on-load voltage regulating transformer 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 tapping tap of the auxiliary winding are identical to those of the input winding; the tapping tap on the auxiliary winding is an auxiliary tapping tap; the plurality of input tapping taps are respectively connected with the plurality of input on-off switches in a one-to-one correspondence manner, each input tapping tap is connected with the output end of only one corresponding input on-off switch, the plurality of auxiliary tapping taps are respectively connected with the plurality of auxiliary on-off switches in a one-to-one correspondence manner, and each auxiliary tapping tap is connected with the output end of only one corresponding auxiliary on-off switch; 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 seamless switched on-load tap changer of claim 1, wherein each of the input tap changers is connected to an output of only a corresponding one of the input on-off switches; each auxiliary tapping tap is connected with the output end of the corresponding auxiliary on-off switch.
3. A seamless switched on-load tap changer according to any one 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 voltage regulating transformer 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 the adjusting winding is led out to form a plurality of input tapping taps; the winding direction, the number of turns and the tapping tap of the auxiliary winding are identical to those of the regulating winding; the tapping tap on the auxiliary winding is an auxiliary tapping tap; the input tapping taps are respectively connected with the input on-off switches in a one-to-one correspondence manner, and each input tapping tap is connected with the output end of only one corresponding input on-off switch; the auxiliary tapping taps are connected with the auxiliary on-off switches in a one-to-one correspondence manner, and each auxiliary tapping tap is connected with the output end of only one corresponding auxiliary on-off switch; 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 and the end of the regulating winding are simultaneously connected with the head end of the main winding.
5. The seamless switched on-load tap changer of claim 4, wherein each of the input tap changers is connected with an output of only a corresponding one of the input on-off switches; each auxiliary tapping tap is connected with the output end of the corresponding auxiliary on-off switch.
6. The seamless switched on-load tap changer of any one 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 CN114038667B (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 CN114038667B (en) | 2021-11-09 | 2021-11-09 | Seamless switching on-load voltage regulating transformer |
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| CN114038667A CN114038667A (en) | 2022-02-11 |
| CN114038667B true CN114038667B (en) | 2024-06-14 |
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| CN202111321906.XA Active CN114038667B (en) | 2021-11-09 | 2021-11-09 | Seamless switching on-load voltage regulating transformer |
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Citations (2)
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1060596A (en) * | 1952-07-24 | 1954-04-02 | Electricite De France | Further training in transformer tap-change devices |
| NL6717499A (en) * | 1967-01-21 | 1968-07-22 | ||
| 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 |
| 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 |
| JP7312723B2 (en) * | 2020-04-24 | 2023-07-21 | 株式会社ダイヘン | On-load tap changers and voltage regulators |
| 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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2021
- 2021-11-09 CN CN202111321906.XA patent/CN114038667B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN114038667A (en) | 2022-02-11 |
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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. |
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