CN114883121A - Symmetrical double-vacuum-bulb transition circuit used on vacuum on-load tap-changer - Google Patents
Symmetrical double-vacuum-bulb transition circuit used on vacuum on-load tap-changer Download PDFInfo
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- CN114883121A CN114883121A CN202110911048.8A CN202110911048A CN114883121A CN 114883121 A CN114883121 A CN 114883121A CN 202110911048 A CN202110911048 A CN 202110911048A CN 114883121 A CN114883121 A CN 114883121A
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- vacuum
- tap
- change
- changer
- switch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/56—Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention discloses a symmetrical double-vacuum-bulb transition circuit used on a vacuum on-load tap changer, which consists of a main through-current switch M1, a main through-current switch M2, a change-over switch T1, a change-over switch T2, a change-over switch T3, a vacuum circuit breaker V1, a vacuum circuit breaker V2 and a transition resistor R, wherein the time sequence of switching from an N-tap side to an N + 1-tap side and from the N + 1-tap side to the N-tap side in the transition process of the vacuum on-load tap changer is a symmetrical time sequence, and only one set of driving part is needed for two times of switching.
Description
Technical Field
The application relates to the technical field of tap changers, in particular to a symmetrical double-vacuum-bulb transition circuit used on a vacuum on-load tap changer.
Background
When the on-load tap-changer carries out on-load voltage regulation action, electric arcs can be generated between the moving contact and the static contact. The arc can ablate the contact, and can decompose the transformer oil, greatly reducing the insulating property. As one type of on-load tap-changer, the vacuum on-load tap-changer mainly realizes arc extinguishing by a vacuum bubble of a change-over switch, and electric arcs and hot gases are not exposed. The oil in the oil chamber of the tap changer is not carbonized and polluted, the oil does not need to be purified, and the burning corrosion of the contact in the vacuum bubble can be reduced to the minimum.
The time sequence of switching the switching core of the prior on-load tap changer from odd tap to even tap and from even tap to odd tap is asymmetric, so that two sets of mechanical driving parts (cams or grooved wheels) are required for switching twice, and the structure of the switch is complex.
Disclosure of Invention
In order to solve the problems, the application provides a symmetrical double-vacuum-bulb transition circuit used on a vacuum on-load tap-changer, which is composed of a main through-current switch M1, a main through-current switch M2, a change-over switch T1, a change-over switch T2, a change-over switch T3, a vacuum circuit breaker V1, a vacuum circuit breaker V2 and a transition resistor R.
The main through-flow switch M1 is connected with the N tap side of the vacuum on-load tap-changer and the neutral point of the transformer;
the main through-flow switch M2 is connected with the N +1 tapping side of the vacuum on-load tap-changer and the neutral point of the transformer;
the fixed end of the change-over switch T1 is connected with the neutral point of the transformer through a vacuum circuit breaker V1, and the action arm of the change-over switch T1 is switched between the N-tap side of the vacuum on-load tap-changer and the transition resistor R;
the fixed end of the change-over switch T2 is connected with the neutral point of the transformer through a vacuum circuit breaker V2, and the action arm of the change-over switch T2 is switched between the N +1 tapping side of the vacuum on-load tap-changer and the transition resistor R;
the fixed end of the transfer switch T3 is connected with a transition resistor R, and the action arm of the transfer switch T3 is switched randomly between the N tapping side and the N +1 tapping side of the vacuum on-load tap-changer;
the vacuum circuit breaker V1 is connected with the neutral point of the transformer and the fixed end of the change-over switch T1, and the vacuum circuit breaker V2 is connected with the neutral point of the transformer and the fixed end of the change-over switch T2;
one side of the transition resistor R is connected with the fixed end of the change-over switch T3, and the other side is respectively connected with one side contact of the change-over switches T1 and T2.
Preferably, the timing sequence of switching the N-tap side to the N + 1-tap side and the timing sequence of switching the N + 1-tap side to the N-tap side of the vacuum on-load tap-changer are symmetrical timing sequences.
The application provides a two vacuum bubble transition circuits of symmetry type for on-load tap-changer of vacuum solves the time sequence asymmetry that prior art vacuum on-load tap-changer switches over the core and switches over from odd shunting to even shunting and from even shunting to odd shunting, problem that the switch structure is complicated.
Drawings
Fig. 1 is a structural diagram of a symmetrical double-vacuum-bulb transition circuit for a vacuum on-load tap changer in an N-tap state according to an embodiment of the present application;
fig. 2 is a schematic diagram of a transition circuit of an on-load tap changer for converting from an N-tap side to an N + 1-tap side according to an embodiment of the present application;
fig. 3 is a structural diagram of a symmetrical double vacuum bulb transition circuit for a vacuum on-load tap changer in N +1 tapping according to an embodiment of the present application;
fig. 4 is a timing diagram for switching the transition circuit of the on-load tap-changer from the N-tap side to the N + 1-tap side according to the embodiment of the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit and scope of this application, and thus this application is not limited to the specific implementations disclosed below.
As shown in fig. 1, the present application provides a symmetrical double vacuum bulb transition circuit for a vacuum on-load tap changer, which is composed of a main through-current switch M1, a main through-current switch M2, a transfer switch T1, a transfer switch T2, a transfer switch T3, a vacuum breaker V1, a vacuum breaker V2, and a transition resistor R. Wherein the content of the first and second substances,
the main through-current switch M1 is connected with the N-tap side of the vacuum on-load tap-changer and the neutral point of the transformer;
the main through-flow switch M2 is connected with the N +1 tapping side of the vacuum on-load tap-changer and the neutral point of the transformer;
the fixed end of the change-over switch T1 is connected with the neutral point of the transformer through a vacuum circuit breaker V1, and the action arm of the change-over switch T1 is switched between the N-tap side of the vacuum on-load tap-changer and the transition resistor R;
the fixed end of the change-over switch T2 is connected with the neutral point of the transformer through a vacuum circuit breaker V2, and the action arm of the change-over switch T2 is switched between the N +1 tapping side of the vacuum on-load tap-changer and the transition resistor R;
the fixed end of the transfer switch T3 is connected with a transition resistor R, and the action arm of the transfer switch T3 is switched randomly between the N tapping side and the N +1 tapping side of the vacuum on-load tap-changer;
the vacuum circuit breaker V1 is connected with the neutral point of the transformer and the fixed end of the change-over switch T1, and the vacuum circuit breaker V2 is connected with the neutral point of the transformer and the fixed end of the change-over switch T2;
one side of the transition resistor R is connected with the fixed end of the change-over switch T3, and the other side is respectively connected with one side contact of the change-over switches T1 and T2.
The time sequence of switching the N-tap side to the N + 1-tap side and the time sequence of switching the N + 1-tap side to the N-tap side of the vacuum on-load tap-changer are symmetrical time sequences.
The switching process and the current breaking task of the vacuum on-load tap-changer are borne by the two vacuum circuit breakers V1 and V2, and the switching task of only one vacuum circuit breaker in the existing topology is shared. The vacuum circuit breaker mentioned in the present application refers to a vacuum bubble circuit breaker, which may also be referred to as a vacuum bubble, so that a transition circuit formed by two vacuum circuit breakers is referred to as a double vacuum bubble transition circuit.
As shown in fig. 1, the present application provides a symmetrical double vacuum bulb transition circuit for a vacuum on-load tap changer, comprising three phases, each phase comprising: a main through-current switch M1, a main through-current switch M2, a transfer switch T1, a transfer switch T2, a transfer switch T3, vacuum interrupters V1 and V2, and a transition resistor R.
The switching process of a symmetrical double vacuum bulb transition circuit for a vacuum on-load tap-changer according to the present application will be further described with reference to fig. 1 and fig. 2a to 2 j.
As shown in fig. 1, when the shift of the on-load tap-changer is in N-tap, the main switch M1 is closed, the main switch M2 is opened, the moving contact of the action arm of the change-over switch T1 is connected with N-tap, the moving contact of the action arm of the change-over switch T2 is connected with the transition resistor, the vacuum circuit breakers V1 and V2 are closed, and at this time, the load current I on N-tap side is N And the output is output to the neutral point of the transformer through a main switch M1.
When the tap changer is switched from the N-tap side to the N + 1-tap side, the operation steps of the transition circuit include:
as shown in FIGS. 1 and 2aThe main switch M1 is opened, and the load current I on the N-tap side is obtained N The current flows through a transfer switch T1 and a vacuum circuit breaker V1 and is output to a neutral point of the transformer;
as shown in fig. 1 and 2b, vacuum interrupter V1 is opened, with load current I on the N-tap side N The current flows through a change-over switch T3, a transition resistor R, a change-over switch T2 and a vacuum circuit breaker V2 and is output to a neutral point of the transformer;
as shown in fig. 1 and 2c, the transfer switch T1 is operated to actuate the arm and connect it to the transition resistor. Load current I at the N tap side N The current flows through a change-over switch T3, a transition resistor R, a change-over switch T2 and a vacuum circuit breaker V2 and is output to a neutral point of the transformer;
as shown in fig. 1 and 2d, vacuum interrupter V1 is closed with load current I on the N-tap side N The current flows through a change-over switch T3 and a transition resistor R and then is divided, one path of current flows through the change-over switch T1 and a current breaker V1 and is output to a transformer neutral point, and the other path of current change-over switch T2 and a vacuum breaker V2 are output to the transformer neutral point;
as shown in fig. 1 and 2e, vacuum interrupter V2 is opened, with load current I on the N-tap side N The current flows through a change-over switch T3, a transition resistor R, a change-over switch T1 and a vacuum circuit breaker V1 and is output to a neutral point of the transformer;
as shown in fig. 1 and 2f, the transfer switch T2 is operated to connect the actuating arm to the N +1 tap, when the load current I on the N-tap side is applied N The current flows through a change-over switch T3, a transition resistor R, a change-over switch T1 and a vacuum circuit breaker V1 and is output to a neutral point of the transformer;
as shown in FIGS. 1 and 2g, when the vacuum interrupter V2 is closed, the transition circuit connects the N tap side and the N +1 tap side simultaneously to form a bridge, and a circulating current I is generated C ＝U S and/R, where the load current is diverted from the N-tap side to the N + 1-tap side. Wherein, the U S Is an on-load tap-changer level voltage;
as shown in fig. 1 and 2h, vacuum interrupter V1 is opened, while N +1 tap side load current I N The current flows through a transfer switch T2 and a current breaker V2 and is output to a neutral point of the transformer;
as shown in fig. 1 and 2i, closeM2, load current I on the N +1 tap side N The voltage is output to a neutral point of the transformer through a main switch M2;
as shown in fig. 1 and 2j, operating the transfer switch T3 actuates the arm, connecting it to the N +1 tap, closing the vacuum interrupter V1. At this time, the load current I of the N +1 tapping side N And the output is output to the neutral point of the transformer through a main switch M2. When the tap changing operation is finished, the change-over switch completes the voltage regulation of switching from the N tap side to the N +1 tap side, and circuits before and after the change-over are completely symmetrical.
As shown in fig. 3, when the shift of the on-load tap-changer is in N +1 tap, the main switch M2 is closed, the main switch M1 is opened, the moving contact of the action arm of the change-over switch T2 is connected with N +1 tap, the moving contact of the action arm of the change-over switch T1 is connected with the transition resistor, the vacuum circuit breakers V1 and V2 are closed, and at this time, the load current I on the N +1 tap side is N And the output is output to the neutral point of the transformer through a main switch M2.
The transition circuit switching timing diagram is shown in fig. 4 when the tap selector is switched from N-tap to N + 1-tap.
The conversion principle for switching from N +1 tapping to N tapping is the same, and the process is similar, and is not described herein again.
The foregoing has described in detail the fundamental principles and the principal features of the invention and the technical effects that result therefrom. It will be understood by those skilled in the art that the present invention is not limited to the preferred embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A symmetrical double-vacuum-bulb transition circuit used on a vacuum on-load tap-changer is composed of a main through-current switch M1, a main through-current switch M2, a change-over switch T1, a change-over switch T2, a change-over switch T3, a vacuum circuit breaker V1, a vacuum circuit breaker V2 and a transition resistor R, and is characterized in that,
the main through-flow switch M1 is connected with the N tapping side of the vacuum on-load tap-changer and the neutral point of the transformer;
the main through-flow switch M2 is connected with the N +1 tapping side of the vacuum on-load tap-changer and the neutral point of the transformer;
the fixed end of the change-over switch T1 is connected with the neutral point of the transformer through a vacuum circuit breaker V1, and the action arm of the change-over switch T1 is switched between the N-tap side of the vacuum on-load tap-changer and the transition resistor R;
the fixed end of the change-over switch T2 is connected with a neutral point of the transformer through a vacuum circuit breaker V2, and an action arm of the change-over switch T2 is switched randomly between an N +1 tapping side of the vacuum on-load tap-changer and a transition resistor R;
the fixed end of the transfer switch T3 is connected with a transition resistor R, and the action arm of the transfer switch T3 is switched randomly between the N tapping side and the N +1 tapping side of the vacuum on-load tap-changer;
the vacuum circuit breaker V1 is connected with the neutral point of the transformer and the fixed end of the change-over switch T1, and the vacuum circuit breaker V2 is connected with the neutral point of the transformer and the fixed end of the change-over switch T2;
one side of the transition resistor R is connected with the fixed end of the change-over switch T3, and the other side is respectively connected with one side contact of the change-over switches T1 and T2.
2. The transition circuit of claim 1, wherein the timing of the N-tap side to N + 1-tap side switching and the timing of the N + 1-tap side to N-tap side switching of the vacuum on-load tap-changer are symmetrical timing sequences.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110911048.8A CN114883121A (en) | 2021-08-09 | 2021-08-09 | Symmetrical double-vacuum-bulb transition circuit used on vacuum on-load tap-changer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110911048.8A CN114883121A (en) | 2021-08-09 | 2021-08-09 | Symmetrical double-vacuum-bulb transition circuit used on vacuum on-load tap-changer |
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| Publication Number | Publication Date |
|---|---|
| CN114883121A true CN114883121A (en) | 2022-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110911048.8A Pending CN114883121A (en) | 2021-08-09 | 2021-08-09 | Symmetrical double-vacuum-bulb transition circuit used on vacuum on-load tap-changer |
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| Country | Link |
|---|---|
| CN (1) | CN114883121A (en) |
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2021
- 2021-08-09 CN CN202110911048.8A patent/CN114883121A/en active Pending
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