CN213094175U - Transformer on-load tap-changer - Google Patents
Transformer on-load tap-changer Download PDFInfo
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- CN213094175U CN213094175U CN202021677923.8U CN202021677923U CN213094175U CN 213094175 U CN213094175 U CN 213094175U CN 202021677923 U CN202021677923 U CN 202021677923U CN 213094175 U CN213094175 U CN 213094175U
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Abstract
The utility model relates to a transformer on-load tap-changer. The transformer comprises main contacts K1 and K2, a change-over switch K3, a resistor R, a capacitor C and vacuum switches V1 and V2, wherein one end of the main contact K1 is connected with an odd tap N of the transformer, and one end of the main contact K2 is connected with an even tap N +1 of the transformer; the change-over switch K3 is provided with a static contact A, B and a moving contact C, the static contact A is connected with the other end of the main contact K1, and the static contact B is connected with the other end of the main contact K2; the other end of the main contact K1 is also connected with a resistor R and a capacitor C, and the resistor R and the capacitor C are connected with the input end of a vacuum switch V1 after being connected in parallel; a moving contact C of the change-over switch K3 is connected with an input end of a vacuum switch V2; the output terminals of the vacuum switches V1 and V2 are connected in parallel and then connected to a load LA. The utility model discloses thereby can reduce the arcing that produces when switching greatly and reduce the contact loss, can reduce the consumption that generates heat on the resistance again simultaneously, reliably durable.
Description
Technical Field
The utility model relates to a transformer on-load tap-changer belongs to electrical switching device technical field.
Background
An on-load tap changer is a switching device which provides constant voltage for a transformer when the load changes. The basic principle is that switching between taps in a transformer winding is realized under the condition of ensuring that load current is not interrupted, so that the number of turns of the winding, namely the voltage ratio of the transformer, is changed, and the purpose of voltage regulation is finally realized.
The existing tap changers all have transition resistance (or impedance), so that large circulating current exists during conversion. This circulating current easily damages the transition resistance and affects the switching frequency. In addition, electric arcs generated by load current or circulating current exist during switching, so that the contact is easily burnt and damaged, and the service life is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at not enough to the prior art, provide and have a transformer on-load tap-changer, reduce the circulation when switching to reduce transition resistance and generate heat, improve resistance life, improve switching frequency, reduced contact switching electric arc simultaneously, prolonged contact life.
In order to realize the purpose, the technical scheme of the utility model is as follows: the on-load tap-changer of the transformer is characterized by comprising main contacts K1 and K2, a change-over switch K3, a resistor R, a capacitor C and vacuum switches V1 and V2, wherein one end of the main contact K1 is connected with an odd tap N of the transformer, and one end of the main contact K2 is connected with an even tap N +1 of the transformer;
the change-over switch K3 is provided with a static contact A, B and a moving contact C, the static contact A is connected with the other end of the main contact K1, and the static contact B is connected with the other end of the main contact K2;
the other end of the main contact K1 is also connected with a resistor R and a capacitor C, and the resistor R and the capacitor C are connected with the input end of a vacuum switch V1 after being connected in parallel;
a moving contact C of the change-over switch K3 is connected with an input end of a vacuum switch V2; the output terminals of the vacuum switches V1 and V2 are connected in parallel and then connected to a load LA.
The resistor R is a thermistor with a positive temperature coefficient.
The utility model discloses thereby can reduce the arcing that produces when switching greatly and reduce the contact loss, can reduce the consumption of generating heat on the resistance again simultaneously, make it more reliable durable to improve the reliability and the life-span of switch.
Drawings
FIG. 1 is a schematic diagram of the present invention
Fig. 2 is a schematic diagram showing the main contact K2 turned on and the vacuum switch V1 turned on.
Fig. 3 is a schematic diagram of vacuum switch V2 being open.
Fig. 4 is a schematic diagram of the change-over switch K3 in which the moving contact C is disconnected from the stationary contact a and is connected to the stationary contact B.
Fig. 5 is a schematic diagram of vacuum switch V2 turned on.
Fig. 6 is a schematic diagram of vacuum switch V1 being open.
Fig. 7 is a schematic diagram of the main contact K1 being open and the vacuum switch V1 being open.
Detailed Description
The principles and embodiments of the present invention will be further described with reference to the drawings.
As shown in the accompanying drawings, the on-load tap changer of the transformer of the present invention comprises main contacts K1, K2, a transfer switch K3, a resistor R, a capacitor C, and vacuum switches V1 and V2, wherein one end of the main contact K1 is connected to an odd tap N of the transformer, and one end of the main contact K2 is connected to an even tap N +1 of the transformer;
the change-over switch K3 is provided with a static contact A, B and a moving contact C, the static contact A is connected with the other end of the main contact K1, and the static contact B is connected with the other end of the main contact K2;
the other end of the main contact K1 is also connected with a resistor R and a capacitor C, and the resistor R and the capacitor C are connected with the input end of a vacuum switch V1 after being connected in parallel;
a moving contact C of the change-over switch K3 is connected with an input end of a vacuum switch V2; the output terminals of the vacuum switches V1 and V2 are connected in parallel and then connected to a load LA.
The state before switching is shown in figure 1
The main contact K1 is on, K2 is off, the vacuum switch V1 is off, and V2 is on. The moving contact of the change-over switch is connected with the static contact A, and the load LA is connected with the transformer tap N at the moment.
The switching step process:
1) FIG. 2: the main contact K2 is turned on, and the vacuum switch V1 is turned on.
2) FIG. 3: vacuum switch V2 is open and the load current is supplied by tap N through resistor R, which heats up. The smaller the resistance R, the smaller the heat generation amount. Meanwhile, the resistance value of the resistor R is small, so that the arc of the vacuum switch V2 can be extinguished, and the capacitor C can absorb the arc. The resistor R is a positive temperature coefficient thermistor, and the resistance value is the minimum in a cold state.
3) FIG. 4: the moving contact C of the change-over switch K3 is disconnected from the stationary contact a and is connected to the stationary contact B.
4) FIG. 5: vacuum switch V2 is on. At the moment, the load current is provided by a tap N +1 through a static contact B and a movable contact C.
At the moment, the resistor R is bridged between the tap N and the tap N +1, the interstage voltage immediately generates larger circulation current on the resistor R, the temperature of the resistor R is obviously increased, the resistance value of the resistor R is rapidly increased to a certain relatively stable value, and the circulation current can be rapidly reduced.
5) FIG. 6: vacuum switch V1 is open. Due to the reduced circulating current, the arc generated when the vacuum switch V1 opens is correspondingly reduced, while the capacitor C helps to absorb the arc.
The above description is only an example of the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The on-load tap-changer of the transformer is characterized by comprising main contacts K1 and K2, a change-over switch K3, a resistor R, a capacitor C and vacuum switches V1 and V2, wherein one end of the main contact K1 is connected with an odd tap N of the transformer, and one end of the main contact K2 is connected with an even tap N +1 of the transformer;
the change-over switch K3 is provided with a static contact A, B and a moving contact C, the static contact A is connected with the other end of the main contact K1, and the static contact B is connected with the other end of the main contact K2;
the other end of the main contact K1 is also connected with a resistor R and a capacitor C, and the resistor R and the capacitor C are connected with the input end of a vacuum switch V1 after being connected in parallel;
a moving contact C of the change-over switch K3 is connected with an input end of a vacuum switch V2; the output terminals of the vacuum switches V1 and V2 are connected in parallel and then connected to a load LA.
2. The on-load tap-changer of transformer according to claim 1, characterized in that said resistor R is a positive temperature coefficient thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021677923.8U CN213094175U (en) | 2020-08-13 | 2020-08-13 | Transformer on-load tap-changer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021677923.8U CN213094175U (en) | 2020-08-13 | 2020-08-13 | Transformer on-load tap-changer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213094175U true CN213094175U (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202021677923.8U Active CN213094175U (en) | 2020-08-13 | 2020-08-13 | Transformer on-load tap-changer |
Country Status (1)
| Country | Link |
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| CN (1) | CN213094175U (en) |
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2020
- 2020-08-13 CN CN202021677923.8U patent/CN213094175U/en active Active
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