CN-121984487-A - Selection switch, on-load voltage-regulating tap switch and distribution transformer thereof

CN121984487ACN 121984487 ACN121984487 ACN 121984487ACN-121984487-A

Abstract

The invention provides a selector switch, an on-load voltage regulation decomposition switch and a distribution transformer thereof, and relates to the technical field of on-load voltage regulation of distribution transformers, comprising a first silicon carbide N-type insulated gate bipolar transistor, a first RC circuit, a second RC circuit and a second silicon carbide N-type insulated gate bipolar transistor, wherein the collector electrode of the first silicon carbide N-type insulated gate bipolar transistor, the first end of the first RC circuit, the second end of the second RC circuit and the emitter electrode of the second silicon carbide N-type insulated gate bipolar transistor are connected; the emitter of the first silicon carbide N-type insulated gate bipolar transistor, the second end of the first RC circuit, the first end of the second RC circuit and the collector of the second silicon carbide N-type insulated gate bipolar transistor are connected. The invention can realize the arcless switching of the distribution transformer.

Inventors

CHEN YUN
LI YABO
TANG AIHONG
TONG ZEJUN
GU LINGYUN
LUO BIN
YU CONG
HU QING
HUANG YADONG
LING XIAOWEI
CHEN YU
ZHANG JUN

Assignees

浙江容大电力工程有限公司
国网浙江省电力有限公司杭州市富阳区供电公司
武汉理工大学

Dates

Publication Date: 20260505
Application Date: 20251209

Claims (10)

1. A selector switch applied to a distribution transformer is characterized by comprising a first silicon carbide N-type insulated gate bipolar transistor, a first RC circuit, a second RC circuit and a second silicon carbide N-type insulated gate bipolar transistor, The collector of the first silicon carbide N-type insulated gate bipolar transistor, the first end of the first RC circuit, the second end of the second RC circuit and the emitter of the second silicon carbide N-type insulated gate bipolar transistor are connected, and the emitter of the first silicon carbide N-type insulated gate bipolar transistor, the second end of the first RC circuit, the first end of the second RC circuit and the collector of the second silicon carbide N-type insulated gate bipolar transistor are connected.
2. The selector switch of claim 1, wherein the first RC circuit comprises a first resistor and a first capacitor, the first end of the first resistor being the first end of the first RC circuit, the second end of the first resistor being connected to the first end of the first capacitor, the second end of the first capacitor being the second end of the first RC circuit; the second RC circuit comprises a second resistor and a second capacitor, the first end of the second resistor is the first end of the second RC circuit, the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is the second end of the second RC circuit; the first RC circuit is used for absorbing overvoltage generated in the turn-off process of the first silicon carbide N-type insulated gate bipolar transistor, and the second RC circuit is used for absorbing overvoltage generated in the turn-off process of the second silicon carbide N-type insulated gate bipolar transistor.
3. The selector switch of claim 2 wherein the first resistor and the second resistor have a resistance of 40Ω and the first capacitor and the second capacitor have a capacitance of 0.2 μf.
4. An on-load voltage-regulating tap changer is characterized in that the on-load voltage-regulating tap changer is connected with a transformer winding tap and comprises a third resistor and a protection circuit, wherein the protection circuit comprises the selector switch of any one of claims 1-3, one end of the protection circuit is connected with the tap, and the other end of the protection circuit is connected with the third resistor.
5. The on-load tap changer of claim 4, wherein in the case where the taps include a first tap and a second tap, the protection circuit includes a first protection circuit and a second protection circuit, the first protection circuit is connected to the first tap, the second protection circuit is connected to the second tap, and the first protection circuit and the second protection circuit are connected to the third resistor.
6. The on-load tap changer of claim 5, wherein the first protection circuit comprises a first selector switch and a third selector switch, the second protection circuit comprises a second selector switch and a fourth selector switch, the first end of the first selector switch, the first end of the third selector switch are connected with the first tap, the first end of the second selector switch, the first end of the fourth selector switch are connected with the second tap, the second end of the third selector switch and the second end of the fourth selector switch are connected with the first end of the third resistor, and the second end of the first selector switch is connected with the second end of the second selector switch.
7. The on-load tap changer of claim 6, wherein the third resistor has a resistance of 6Ω.
8. A three-phase on-load tap changer comprising an equivalent power supply, three single-phase transformers connected in series with each other and the on-load tap changer of any one of claims 4-7, the on-load tap changer comprising a third protection circuit, a fourth protection circuit, a fifth protection circuit and the third resistor, a first single-phase transformer of the three single-phase transformers having a third tap, a first end of the third protection circuit being connected to the third tap, a second single-phase transformer of the three single-phase transformers having a fourth tap, a first end of the fourth protection circuit being connected to the fourth tap, a third single-phase transformer of the three single-phase transformers having a fifth tap, a first end of the fifth protection circuit being connected to the fifth tap, a second end of the third protection circuit, a second end of the fourth protection circuit and a second end of the fifth protection circuit all being connected to the third resistor, a third end of the third protection circuit being connected to the equivalent power supply, a second end of the third protection circuit being connected to the third resistor, and a third end of the third single-phase transformer being connected in series with each other.
9. The three-phase on-load tap changing split switching transformer according to claim 8, wherein the third protection circuit comprises a fifth selection switch and an eighth selection switch, the fourth protection circuit comprises a sixth selection switch and a ninth selection switch, the fifth protection circuit comprises a seventh selection switch and a tenth selection switch, the first ends of the fifth selection switch and the eighth selection switch are connected with the third tap, the first ends of the sixth selection switch and the ninth selection switch are connected with the fourth tap, the first ends of the seventh selection switch and the tenth selection switch are connected with the fifth tap, The second end of the eighth selection switch, the second end of the ninth selection switch and the second end of the tenth selection switch are all connected with the first end of the third resistor, and the second end of the fifth selection switch, the second end of the sixth selection switch and the second end of the seventh selection switch are mutually connected and grounded.
10. A distribution transformer, comprising a three-phase on-load tap changer according to any one of claims 8-9, a tap changer module and a time-controlled switch module, wherein the three-phase on-load tap changer is coupled to a first end of the tap changer module and a second end of the tap changer module is coupled to the time-controlled switch module; The time control switch module comprises three single-phase transformers, a first time control switch, a second time control switch, a third time control switch, a control module and a load which are connected in series, wherein a fourth single-phase transformer of the three single-phase transformers is provided with a fourth tap, a fifth single-phase transformer of the three single-phase transformers is provided with a fifth tap, a sixth single-phase transformer of the three single-phase transformers is provided with a sixth tap, a first end of the first time control switch is connected with the fourth tap, a first end of the second time control switch is connected with the fifth tap, a first end of the third time control switch is connected with the seventh tap, a second end of the first time control switch, a second end of the second time control switch and a second end of the third time control switch are all connected with the load, and the control module controls the on-off of the first time control switch, the second time control switch and the third time control switch.

Description

Selection switch, on-load voltage-regulating tap switch and distribution transformer thereof Technical Field The invention relates to the technical field of on-load voltage regulation of distribution transformers, in particular to a selection switch, an on-load voltage regulation decomposition switch and a distribution transformer thereof. Background The existing mechanical on-load voltage-regulating distribution transformers configured in the distribution transformer areas have the problems of large arc light, easy pollution of insulating oil, long mechanical switching action time, limited gear adjustment number and the like during switching, and the cost of later operation and maintenance is high, the risk rate of operation faults is high, and the cascading failure rate among a plurality of distribution transformers is high. Disclosure of Invention In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a selection switch, an on-load tap changer and a distribution transformer structure thereof, which can solve the technical problems of arc light switching and the like existing in the prior art when the voltage of the traditional mechanical on-load tap changer is regulated. In a first aspect of an embodiment of the present invention, a selector switch, a first silicon carbide N-type insulated gate bipolar transistor, a first RC circuit, a second RC circuit and a second silicon carbide N-type insulated gate bipolar transistor are provided, The collector of the first silicon carbide N-type insulated gate bipolar transistor, the first end of the first RC circuit, the second end of the second RC circuit and the emitter of the second silicon carbide N-type insulated gate bipolar transistor are connected, and the emitter of the first silicon carbide N-type insulated gate bipolar transistor, the second end of the first RC circuit, the first end of the second RC circuit and the collector of the second silicon carbide N-type insulated gate bipolar transistor are connected. In a second aspect of the embodiment of the invention, an on-load voltage-regulating tap changer is provided, the on-load voltage-regulating tap changer is connected with a transformer winding tap, the on-load voltage-regulating tap changer comprises a third resistor and a protection circuit, the protection circuit comprises the selection switch mentioned in the first aspect, one end of the protection circuit is connected with the tap, and the other end of the protection circuit is connected with the third resistor. In a third aspect of the embodiment of the present invention, a three-phase on-load tap changer is provided, which includes an equivalent power supply, three single-phase transformers connected in series with each other and the on-load tap changer mentioned in the second aspect, the on-load tap changer includes a third protection circuit, a fourth protection circuit, a fifth protection circuit and the third resistor, a first single-phase transformer of the three single-phase transformers has a third tap, a first end of the third protection circuit is connected with the third tap, a second single-phase transformer of the three single-phase transformers has a fourth tap, a first end of the fourth protection circuit is connected with the fourth tap, a third single-phase transformer of the three single-phase transformers has a fifth tap, a first end of the fifth protection circuit is connected with the fifth tap, a second end of the third protection circuit, a second end of the fourth protection circuit and a second end of the fifth protection circuit are all connected with the third resistor, a first end of the third protection circuit is connected with the equivalent power supply, and a third end of the third protection circuit is connected with the equivalent power supply, and the third end of the third single-phase transformer is connected with the equivalent power supply in series. A third aspect of the embodiment of the present invention provides a distribution transformer, which includes the three-phase on-load voltage-regulating decomposition switch transformer mentioned in the third aspect, a voltage-regulating module and a time-controlled switch module, where the three-phase on-load voltage-regulating decomposition switch transformer is coupled with a first end of the voltage-regulating module, and a second end of the voltage-regulating module is coupled with the time-controlled switch module; The time control switch module comprises three single-phase transformers, a first time control switch, a second time control switch, a third time control switch, a control module and a load which are connected in series, wherein a fourth single-phase transformer of the three single-phase transformers is provided with a fourth tap, a fifth single-phase transformer of the three single-phase transformers is provided with a fifth tap, a sixth single-phase transformer of the three single-ph