CN113113261A - Double-vacuum-tube reciprocating transition circuit of vacuum on-load tap-changer and switching control method thereof - Google Patents
Double-vacuum-tube reciprocating transition circuit of vacuum on-load tap-changer and switching control method thereof Download PDFInfo
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- CN113113261A CN113113261A CN202110296132.3A CN202110296132A CN113113261A CN 113113261 A CN113113261 A CN 113113261A CN 202110296132 A CN202110296132 A CN 202110296132A CN 113113261 A CN113113261 A CN 113113261A
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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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- 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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Abstract
A vacuum on-load tap-changer double-vacuum-tube reciprocating transition circuit and a switching control method thereof are disclosed, wherein one end of a first main switch M1 and one end of a second main switch M2 in the circuit are respectively connected with a first winding tap N and a second winding tap N + 1; the first switch T1 has at least one stable state capable of turning on the first winding tap N and one stable state capable of turning on the second winding tap N +1, and the second switch T2 has at least three stable states, and among them has at least one stable state capable of turning on the first winding tap N, one stable state capable of turning on the second winding tap N +1, and one stable state not turning on any winding tap; one end of a first vacuum tube V1 is connected to the first change-over switch T1, one end of a second vacuum tube V2 is connected to the second change-over switch T2, and the other end of the second vacuum tube V2 is connected with a transition resistor R in series; the other ends of the first main switch M1, the second main switch M2, the first vacuum tube V1 and the transition resistor R are electrically connected to a neutral point outlet of the on-load tap-changer.
Description
Technical Field
The invention relates to the technical field of on-load tap changers, in particular to a double-vacuum-tube reciprocating transition circuit of a vacuum on-load tap changer and a switching control method thereof.
Background
The on-load tap-changer mainly comprises an electric mechanism, an energy accumulator, an on-load change-over switch and an unloaded tap-changer, and is used for adjusting the output voltage of the transformer in real time and uninterruptedly under the condition of load. The load change-over switch is used for changing over from the current winding tap to the new winding tap with the load, and the core of the load change-over switch is to adopt a transition circuit. The transition circuit is a series resistor circuit connected across the tapping points and used for switching the tapping points of the transformer winding under the charged state. Nowadays, the way of extinguishing arc by vacuum tube in the transition circuit has gradually replaced the way of extinguishing arc from oil.
The chinese patent publication No. CN103026433B introduces a vacuum tube transition circuit, each phase uses 4 vacuum tubes, and the structure of the switch is complicated due to the large number of vacuum tubes, thereby increasing the failure rate and manufacturing cost of the switch. US6740831 describes another vacuum tube transition circuit, in which 2 vacuum tubes are used in each phase, which has the advantages of short switching time and low transition resistance heating. However, the action time sequence of the vacuum tube transition circuit switching from the winding tap N to the winding tap N +1 and from the winding tap N +1 to the winding tap N is asymmetric, and the reciprocating motion of the switching core needs the mechanical pulling mechanism to change the rail, so that the use failure rate of the switch is increased. Furthermore, when servicing the tap changer, manual rotation of the input shaft is required, which sometimes cannot be made precisely the number of turns required. If the number of turns of rotation has the mistake, when artifical promotion cam overhauld, can arouse the interference of component, lead to the damage of product. In practical application, the failure rate of the overhaul even exceeds the failure rate of the use.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a double-vacuum-tube reciprocating transition circuit of a vacuum on-load tap changer, which has the advantages of less required vacuum tubes, short switching time and less heating of transition resistors and ensures that the time sequences of the tap changer in the positive and negative switching processes are the same.
The purpose of the invention is realized by the following technical scheme: a vacuum on-load tap-changer double-vacuum-tube reciprocating transition circuit comprises a first main switch M1, a second main switch M2, a first change-over switch T1, a second change-over switch T2, a first vacuum tube V1, a second vacuum tube V2 and a transition resistor R;
one ends of the first main switch M1 and the second main switch M2 are respectively connected with a first winding tap N and a second winding tap N + 1; the first switch T1 has at least one stable state capable of turning on the first winding tap N and one stable state capable of turning on the second winding tap N +1, and the second switch T2 has at least three stable states, and has at least one stable state capable of turning on the first winding tap N, one stable state capable of turning on the second winding tap N +1, and one stable state not turning on any winding tap; one end of a first vacuum tube V1 is connected to the first change-over switch T1, one end of a second vacuum tube V2 is connected to the second change-over switch T2, and the other end of the second vacuum tube V2 is connected with a transition resistor R in series; and the other ends of the first main switch M1, the second main switch M2, the first vacuum tube V1 and the transition resistor R are electrically connected to a neutral point outlet end of the on-load tap-changer.
Preferably, the first switch T1 and the second switch T2 each include a first stationary contact, a second stationary contact, a third stationary contact and a fourth stationary contact; first stationary contacts of the first change-over switch T1 and the second change-over switch T2 are connected with the first winding tap N, and second stationary contacts of the first change-over switch T1 and the second change-over switch T2 are connected with the second winding tap N + 1; the third stationary contact and the fourth stationary contact of the first switch T1 are both connected with one end of a first vacuum tube V1; a third static contact and a fourth static contact of the second change-over switch T2 are both connected with one end of a second vacuum tube V2, and the other end of the second vacuum tube V2 is connected with a transition resistor R in series.
Preferably, the first switch T1 is configured as a single-pole double-throw switch, wherein the first stationary contact is connected to the third stationary contact or the fourth stationary contact to form a first stable state of the switch, and the second stationary contact is connected to the fourth stationary contact or the third stationary contact to form a second stable state of the switch.
Preferably, the second switch T2 is configured as a single-pole-three-throw switch, wherein the first stationary contact is connected to the third stationary contact or the fourth stationary contact to form a first stationary state of the switch, the second stationary contact is connected to the fourth stationary contact or the third stationary contact to form a second stationary state of the switch, and the third stationary state of the switch exists at a position where none of the first stationary contact, the second stationary contact, the third stationary contact and the fourth stationary contact is connected.
A vacuum on-load tap-changer double-vacuum-tube reciprocating transition circuit switching control method comprises the following switching processes that an on-load change-over switch is switched from a current winding tap to a pre-selected new winding tap, namely from a first winding tap N to a second winding tap N + 1:
s1, the first main switch M1 is conducted, the second main switch M2 is disconnected, the first vacuum tube V1 is conducted, the second vacuum tube V2 is disconnected, the first change-over switch T1 is in one of the stable states of turning on the first winding tap N and is marked as a first stable state, and the second change-over switch T2 is in the stable state of not turning on any circuit and is marked as a third stable state;
s2, the first main switch M1 is turned off, and the rest parts of the reciprocating transition circuit are maintained to be S1;
s3, controlling the second switch T2 to switch to one of the stable states of switching on the first winding tap N to be recorded as a first stable state, and maintaining the rest parts of the reciprocating transition circuit unchanged at S2;
s4, the second vacuum tube V2 is conducted, and the rest parts of the reciprocating transition circuit maintain the S3 unchanged;
s5, the first vacuum tube V1 is disconnected, and the rest parts of the reciprocating transition circuit are maintained unchanged at S4;
s6, controlling the first switch T1 to switch to one of the stable states of switching on the second winding tap N +1 to be recorded as a second stable state, and maintaining the rest parts of the reciprocating transition circuit unchanged at S5;
s7, the first vacuum tube V1 is conducted, and the rest parts of the reciprocating transition circuit maintain the S6 unchanged;
s8, the second vacuum tube V2 is disconnected, and the rest parts of the reciprocating transition circuit maintain the state of S7;
s9, controlling the second switch T2 to switch to a third stable state, and maintaining the rest components of the reciprocating transition circuit unchanged at S8;
s10, the second main switch M2 is conducted, and the rest parts of the reciprocating transition circuit maintain the state of S9;
when the loaded change-over switch is switched from the current winding tap to a preselected new winding tap, namely from the second winding tap N +1 to the first winding tap N, the switching process is that S10 to S1 are executed in reverse, wherein in S8-S3, the steady state that the second change-over switch T2 is controlled to be switched to one of the switches-on second winding tap N +1 is recorded as a second steady state;
in the reciprocating switching, the current winding taps are switched on, the load current flows to the neutral point leading-out state through the main switch connected with the current winding taps, three current winding taps are switched on continuously, the load current flows to the neutral point leading-out state through the first change-over switch T1 and the first vacuum tube V1 and then is switched on through the two current winding taps, the load current flows to the neutral point leading-out state through the second change-over switch T2, the first vacuum tube V2 and the transition resistor R, the current winding tap and the preselected new winding tap in the 7 th time sequence are switched on, the load current flows to the neutral point leading-out state through the first change-over switch T1, the first vacuum tube V1 branch and the second change-over switch T2, the first vacuum tube V2 and the transition resistor R branch simultaneously, and then the preselected new winding tap is switched on, the load current flows to the neutral outlet state through the first change-over switch T1, the first vacuum tube V1, and finally the new winding tap in the pre-selected state is turned on, and the load current flows to the neutral outlet state through the main switch connected to the new winding tap in the pre-selected state.
Preferably, during the switching from the first winding tap N to the second winding tap N +1, the transition circuit forms a bridge connection in step S7 to generate a circulating current Ic, wherein the circulating current Ic passed by the first switch T1 is in the same direction as the load current, and the circulating current Ic passed by the second switch T2 is in the opposite direction to the load current.
Preferably, during the process of switching from the second winding tap N +1 to the first winding tap N, the transition circuit in the 7 th time sequence forms a bridge connection to generate the circulating current Ic, wherein the circulating current Ic passed by the first switch T1 is opposite to the direction of the load current, and the circulating current Ic passed by the second switch T2 is the same as the direction of the load current.
Preferably, the state in which the transition circuit forms a bridge is maintained for 5-10ms during the switching.
Preferably, the switching time for the on-load tap changer to switch from the current winding tap to the preselected new winding tap is 100ms to 110 ms.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the transition circuit only needs 2 vacuum tubes, has simple structure and is beneficial to reducing the failure rate and the manufacturing cost of the switch.
2. The tap switch adopting the transition circuit has symmetrical time sequence in the positive and negative switching process, and a track transfer mechanism does not need to be pulled.
3. The transition circuit has short switching time and small transition resistance heating.
Drawings
Fig. 1 is a schematic diagram of a vacuum on-load tap changer double vacuum tube reciprocating transition circuit of the present invention, showing the basic position where the winding tap N is switched on;
fig. 2 to 10 are schematic diagrams of the vacuum on-load tap changer double-vacuum-tube reciprocating transition circuit of the invention at various steps during the process of switching the load from winding tap N to winding tap N +1, wherein fig. 10 shows the basic position where winding tap N +1 is switched on;
figures 11 through 16 are schematic diagrams of the vacuum on-load tap changer double vacuum tube reciprocating transition circuit of the present invention at certain intermediate steps during the load transfer from winding tap N +1 to winding tap N;
fig. 17 is a timing diagram of the on-off of each switch in the vacuum on-load tap changer double vacuum tube reciprocating transition circuit of the present invention during the process of the load switching from winding tap N to winding tap N + 1;
fig. 18 is a timing diagram of the on-off of each switch in the vacuum on-load tap-changer double-vacuum-tube reciprocating transition circuit in the process of switching the load from the winding tap N +1 to the winding tap N.
Detailed Description
Fig. 1 shows a schematic diagram of a vacuum on-load tap changer double vacuum tube reciprocating transition circuit of the present invention. The vacuum on-load tap-changer double-vacuum-tube reciprocating transition circuit is positioned between a first winding tap N and a second winding tap N +1, and comprises a first main switch M1, a second main switch M2, a first change-over switch T1, a second change-over switch T2, a first vacuum tube V1, a second vacuum tube V2 and a transition resistor R. One end of the first main switch M1 is connected to the first winding tap N; one end of the second main switch M2 is connected to the second winding tap N + 1; the first switch T1 includes a first stationary contact T11, a second stationary contact T12, a third stationary contact T13, and a fourth stationary contact T14. The first static contact T11 is connected with a first winding tap N, the second static contact T12 is connected with a second winding tap N +1, and the third static contact T13 and the fourth static contact T14 are both connected with one end of a first vacuum tube V1; the second changeover switch T2 includes a first stationary contact T21, a second stationary contact T22, a third stationary contact T23, and a fourth stationary contact T24. The first static contact T21 is connected with a first winding tap N, the second static contact T22 is connected with a second winding tap N +1, and the third static contact T23 and the fourth static contact T24 are both connected with one end of a second vacuum tube V2; the other end of the second vacuum tube V2 is connected with a transition resistor R. The other ends of the first main switch T1, the second main switch T2, the first vacuum tube V1 and the transition resistor R are electrically connected to the neutral point outlet 0 of the on-load tap-changer. The first changeover switch T1 is configured as a single-pole double-throw switch, wherein the first stationary contact T11 is connected to the third stationary contact T13 to form a first stable state of the switch, and the second stationary contact T12 is connected to the fourth stationary contact T14 to form a second stable state of the switch. The second switch T2 is configured as a single-pole three-throw switch, wherein the first stationary contact T21 is connected with the third stationary contact T23 to form a first stationary state of the switch, the second stationary contact T22 is connected with the fourth stationary contact T24 to form a second stationary state of the switch, and a third stationary state of the switch exists at a position where the first stationary contact T21, the second stationary contact T22, the third stationary contact T23 and the fourth stationary contact T24 are not connected, that is, as shown in fig. 1, when the second switch T2 is located at a middle position between the first stationary contact T21 and the second stationary contact T22 and a middle position between the third stationary contact T23 and the fourth stationary contact T24, the second switch T2 is in the third stationary state.
When the loaded change-over switch is switched from the winding tap N to the winding tap N +1, the switching process is as follows:
as shown in fig. 1 and 17, the first main switch M1 is turned on, the second main switch M2 is turned off, the first vacuum tube V1 is turned on, the second vacuum tube V2 is turned off, the first switch T1 is in the first stable state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 is in the third stable state (i.e., the second switch T2 is located at the middle position between the first stationary contact T21 and the second stationary contact T22 and the middle position between the third stationary contact T23 and the fourth stationary contact T24), the winding tap N is turned on, and the load current flows to the neutral terminal 0 through the first main switch M1.
As shown in fig. 2 and 17, the first main switch M1 is turned off, the second main switch M2 is turned off, the first vacuum tube V1 is turned on, the second vacuum tube V2 is turned off, the first switch T1 is in the first steady state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 is in the third steady state (i.e., the second switch T2 is located between the first stationary contact T21 and the second stationary contact T22 and between the third stationary contact T23 and the fourth stationary contact T24), the winding tap N is turned on, and the load current flows to the neutral outlet 0 through the first switch T1 and the first vacuum tube V1.
As shown in fig. 3 and 17, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is continuously turned off, the first switch T1 is continuously in the first steady state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 is in the first steady state (i.e., the first stationary contact T21 is connected to the third stationary contact T23), the winding tap N is continuously turned on, and the load current continuously flows to the neutral point outlet 0 through the first switch T1 and the first vacuum tube V1.
As shown in fig. 4 and 17, the first main switch M1 continues to be turned off, the second main switch M2 continues to be turned off, the first vacuum tube V1 continues to be turned on, the second vacuum tube V2 is turned on, the first switch T1 continues to be in the first steady state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 continues to be in the first steady state (i.e., the first stationary contact T21 is connected to the third stationary contact T23), the winding tap N continues to be turned on, and the load current continues to flow to the neutral point terminal 0 through the first switch T1 and the first vacuum tube V1 due to the existence of the transition resistor R.
As shown in fig. 5 and 17, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is turned off, the second vacuum tube V2 is continuously turned on, the first switch T1 is continuously in the first steady state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 is continuously in the first steady state (i.e., the first stationary contact T21 is connected to the third stationary contact T23), the winding tap N is continuously turned on, and the load current flows to the neutral point terminal 0 through the second switch T2, the first vacuum tube V2 and the transition resistor R.
As shown in fig. 6 and 17, the first main switch M1 continues to be turned off, the second main switch M2 continues to be turned off, the first vacuum tube V1 continues to be turned off, the second vacuum tube V2 continues to be turned on, the first switch T1 is in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 continues to be in the first stable state (i.e., the first stationary contact T21 is connected to the third stationary contact T23), the winding tap N continues to be turned on, and the load current continues to flow to the neutral point terminal 0 through the second switch T2, the first vacuum tube V2 and the transition resistor R.
As shown in fig. 7 and 17, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is turned on, the second vacuum tube V2 is continuously turned on, the first switch T1 is continuously in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is continuously in the first stable state (i.e., the first stationary contact T21 is connected to the third stationary contact T23), the winding tap N and the winding tap N +1 are both turned on, and the load current flows to the neutral point terminal 0 through the first switch T1, the first vacuum tube 1 branch, the second switch T2, the first vacuum tube V2, and the transition resistor R branch at the same time. At this time, the transition circuit forms a bridge connection to generate a circulating current Ic, wherein the circulating current Ic passed by the first switch T1 has the same direction as the load current, and the circulating current Ic passed by the second switch T2 has the opposite direction to the load current. The above state is maintained for only a short time (typically 5-10ms) during the switching process.
As shown in fig. 8 and 17, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is turned off, the first switch T1 is continuously in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is continuously in the first stable state (i.e., the first stationary contact T21 is connected to the third stationary contact T23), the winding tap N +1 is turned on, and the load current flows to the neutral point outlet 0 through the first switch T1 and the first vacuum tube V1.
As shown in fig. 9 and 17, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is continuously turned off, the first switch T1 is continuously in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is in the third stable state (i.e., the second switch T2 is located at the middle position between the first stationary contact T21 and the second stationary contact T22 and the middle position between the third stationary contact T23 and the fourth stationary contact T24), the winding tap N +1 is continuously turned on, and the load current continues to flow to the neutral point outlet 0 through the first switch T1 and the first vacuum tube V1.
As shown in fig. 10 and 17, the first main switch M1 is continuously turned off, the second main switch M2 is turned on, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is continuously turned off, the first switch T1 is continuously in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is continuously in the third stable state (i.e., the second switch T2 is located at the middle position between the first stationary contact T21 and the second stationary contact T22 and the middle position between the third stationary contact T23 and the fourth stationary contact T24), the winding tap N +1 is continuously turned on, and the load current flows to the neutral point outlet 0 through the second main switch M2.
When the on-load change-over switch is switched from the winding tap N +1 to the winding tap N, the switching process is substantially opposite to the switching process of the on-load change-over switch from the winding tap N to the winding tap N +1, which is specifically as follows:
as shown in fig. 10 and 18, the first main switch M1 is turned off, the second main switch M2 is turned on, the first vacuum tube V1 is turned on, the second vacuum tube V2 is turned off, the first switch T1 is in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is in the third stable state (i.e., the second switch T2 is located at the middle position between the first stationary contact T21 and the second stationary contact T22 and the middle position between the third stationary contact T23 and the fourth stationary contact T24), the winding tap N +1 is turned on, and the load current flows to the neutral point terminal 0 through the second main switch M2.
As shown in fig. 9 and 18, the first main switch M1 is continuously turned off, the second main switch M2 is turned off, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is continuously turned off, the first switch T1 is continuously in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is continuously in the third stable state (i.e., the second switch T2 is located at the middle position between the first stationary contact T21 and the second stationary contact T22 and the middle position between the third stationary contact T23 and the fourth stationary contact T24), the winding tap N +1 is continuously turned on, and the load current flows to the neutral point outlet 0 through the first switch T1 and the first main switch V1.
As shown in fig. 11 and 18, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is continuously turned off, the first switch T1 is continuously in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is in the second stable state (i.e., the second stationary contact T22 is connected to the fourth stationary contact T24), the winding tap N +1 is continuously turned on, and the load current continuously flows to the neutral point terminal 0 through the first switch T1 and the first vacuum tube V1.
As shown in fig. 12 and 18, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is turned on, the first switch T1 is continuously in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is continuously in the second stable state (i.e., the second stationary contact T22 is connected to the fourth stationary contact T24), the winding tap N +1 is continuously turned on, and the load current continuously flows to the neutral point terminal 0 through the first switch T1 and the first vacuum tube V1 due to the existence of the transition resistor R.
As shown in fig. 13 and 18, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is turned off, the second vacuum tube V2 is continuously turned on, the first switch T1 is continuously in the second stable state (i.e., the second stationary contact T12 is connected to the fourth stationary contact T14), the second switch T2 is continuously in the second stable state (i.e., the second stationary contact T22 is connected to the fourth stationary contact T24), the winding tap N +1 is continuously turned on, and the load current flows to the neutral point terminal 0 through the second switch T2, the second vacuum tube V2 and the transition resistor R.
As shown in fig. 14 and 18, the first main switch M1 continues to be turned off, the second main switch M2 continues to be turned off, the first vacuum tube V1 continues to be turned off, the second vacuum tube V2 continues to be turned on, the first switch T1 is in the first steady state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 continues to be in the second steady state (i.e., the second stationary contact T22 is connected to the fourth stationary contact T24), the winding tap N +1 continues to be turned on, and the load current continues to flow to the neutral point terminal 0 through the second switch T2, the second vacuum tube V2, and the transition resistor R.
As shown in fig. 15 and 18, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is turned on, the second vacuum tube V2 is continuously turned on, the first switch T1 is continuously in the first stable state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 is continuously in the second stable state (i.e., the second stationary contact T22 is connected to the fourth stationary contact T24), the winding tap N and the winding tap N +1 are both turned on, and the load current flows to the neutral point terminal 0 through the first switch T1, the first vacuum tube 1 branch, the second switch T2, the first vacuum tube V2, and the transition resistor R branch at the same time. At this time, the transition circuit forms a bridge connection to generate a circulating current Ic, wherein the circulating current Ic passed by the first switch T1 has the opposite direction to the load current, and the circulating current Ic passed by the second switch T2 has the same direction as the load current. The above state is maintained for only a short time (typically 5-10ms) during the switching process.
As shown in fig. 16 and 18, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is turned off, the first switch T1 is continuously in the first steady state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 is continuously in the second steady state (i.e., the second stationary contact T22 is connected to the fourth stationary contact T24), the winding tap N is turned on, and the load current flows to the neutral point outlet 0 through the first switch T1 and the first vacuum tube V1.
As shown in fig. 2 and 18, the first main switch M1 is continuously turned off, the second main switch M2 is continuously turned off, the first vacuum tube V1 is continuously turned on, the second vacuum tube V2 is continuously turned off, the first switch T1 is continuously in the first stable state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 is in the third stable state (i.e., the second switch T2 is located at the middle position between the first stationary contact T21 and the second stationary contact T22 and the middle position between the third stationary contact T23 and the fourth stationary contact T24), the winding tap N is continuously turned on, and the load current continues to flow to the neutral point outlet 0 through the first switch T1 and the first vacuum tube V1.
As shown in fig. 1 and 18, the first main switch M1 is turned on, the second main switch M2 is turned off, the first vacuum tube V1 is turned on, the second vacuum tube V2 is turned off, the first switch T1 is in the first steady state (i.e., the first stationary contact T11 is connected to the third stationary contact T13), the second switch T2 is in the third steady state (i.e., the second switch T2 is located between the first stationary contact T21 and the second stationary contact T22 and between the third stationary contact T23 and the fourth stationary contact T24), the winding tap N is turned on, and the load current flows to the neutral point terminal 0 through the first main switch M1.
As shown in fig. 17 and 18, the timing diagrams of the switches during the transition of the load from winding tap N to winding tap N +1 and during the transition from winding tap N +1 to winding tap N are symmetrical, that is, the switching action of the switches during the forward and reverse switching is symmetrical without using the pull-rail transfer mechanism.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (9)
1. A vacuum on-load tap-changer double-vacuum-tube reciprocating transition circuit is characterized by comprising a first main switch M1, a second main switch M2, a first change-over switch T1, a second change-over switch T2, a first vacuum tube V1, a second vacuum tube V2 and a transition resistor R;
one ends of the first main switch M1 and the second main switch M2 are respectively connected with a first winding tap N and a second winding tap N + 1; the first switch T1 has at least one stable state capable of turning on the first winding tap N and one stable state capable of turning on the second winding tap N +1, and the second switch T2 has at least three stable states, and has at least one stable state capable of turning on the first winding tap N, one stable state capable of turning on the second winding tap N +1, and one stable state not turning on any winding tap; one end of a first vacuum tube V1 is connected to the first change-over switch T1, one end of a second vacuum tube V2 is connected to the second change-over switch T2, and the other end of the second vacuum tube V2 is connected with a transition resistor R in series; and the other ends of the first main switch M1, the second main switch M2, the first vacuum tube V1 and the transition resistor R are electrically connected to a neutral point outlet end of the on-load tap-changer.
2. The transition circuit of claim 1, wherein the first and second switches T1, T2 each comprise first, second, third, and fourth stationary contacts; first stationary contacts of the first change-over switch T1 and the second change-over switch T2 are connected with the first winding tap N, and second stationary contacts of the first change-over switch T1 and the second change-over switch T2 are connected with the second winding tap N + 1; the third stationary contact and the fourth stationary contact of the first switch T1 are both connected with one end of a first vacuum tube V1; a third static contact and a fourth static contact of the second change-over switch T2 are both connected with one end of a second vacuum tube V2, and the other end of the second vacuum tube V2 is connected with a transition resistor R in series.
3. The transition circuit of claim 2, wherein the first switch T1 is configured as a single-pole double-throw switch, wherein the first stationary contact is connected to the third stationary contact or the fourth stationary contact to form a first stable state of the switch, and the second stationary contact is connected to the fourth stationary contact or the third stationary contact to form a second stable state of the switch.
4. The transition circuit according to claim 2, wherein the second switch T2 is configured as a single-pole-three-throw switch, wherein the first stationary contact is connected to the third stationary contact or the fourth stationary contact to form a first stable state of the switch, the second stationary contact is connected to the fourth stationary contact or the third stationary contact to form a second stable state of the switch, and the third stable state of the switch exists at a position where none of the first stationary contact, the second stationary contact, the third stationary contact and the fourth stationary contact are connected.
5. A switching control method for a double-vacuum-tube reciprocating transition circuit of a vacuum on-load tap changer is characterized in that when an on-load change-over switch is switched from a current winding tap to a preselected new winding tap, namely the switching process from a first winding tap N to a second winding tap N +1 is as follows:
s1, the first main switch M1 is conducted, the second main switch M2 is disconnected, the first vacuum tube V1 is conducted, the second vacuum tube V2 is disconnected, the first change-over switch T1 is in one of the stable states of turning on the first winding tap N and is marked as a first stable state, and the second change-over switch T2 is in the stable state of not turning on any circuit and is marked as a third stable state;
s2, the first main switch M1 is turned off, and the rest parts of the reciprocating transition circuit are maintained to be S1;
s3, controlling the second switch T2 to switch to one of the stable states of switching on the first winding tap N to be recorded as a first stable state, and maintaining the rest parts of the reciprocating transition circuit unchanged at S2;
s4, the second vacuum tube V2 is conducted, and the rest parts of the reciprocating transition circuit maintain the S3 unchanged;
s5, the first vacuum tube V1 is disconnected, and the rest parts of the reciprocating transition circuit are maintained unchanged at S4;
s6, controlling the first switch T1 to switch to one of the stable states of switching on the second winding tap N +1 to be recorded as a second stable state, and maintaining the rest parts of the reciprocating transition circuit unchanged at S5;
s7, the first vacuum tube V1 is conducted, and the rest parts of the reciprocating transition circuit maintain the S6 unchanged;
s8, the second vacuum tube V2 is disconnected, and the rest parts of the reciprocating transition circuit maintain the state of S7;
s9, controlling the second switch T2 to switch to a third stable state, and maintaining the rest components of the reciprocating transition circuit unchanged at S8;
s10, the second main switch M2 is conducted, and the rest parts of the reciprocating transition circuit maintain the state of S9;
when the loaded change-over switch is switched from the current winding tap to a preselected new winding tap, namely from the second winding tap N +1 to the first winding tap N, the switching process is that S10 to S1 are executed in reverse, wherein in S8-S3, the steady state that the second change-over switch T2 is controlled to be switched to one of the switches-on second winding tap N +1 is recorded as a second steady state;
in the reciprocating switching, the current winding taps are switched on, the load current flows to the neutral point leading-out state through the main switch connected with the current winding taps, three current winding taps are switched on continuously, the load current flows to the neutral point leading-out state through the first change-over switch T1 and the first vacuum tube V1 and then is switched on through the two current winding taps, the load current flows to the neutral point leading-out state through the second change-over switch T2, the first vacuum tube V2 and the transition resistor R, the current winding tap and the preselected new winding tap in the 7 th time sequence are switched on, the load current flows to the neutral point leading-out state through the first change-over switch T1, the first vacuum tube V1 branch and the second change-over switch T2, the first vacuum tube V2 and the transition resistor R branch simultaneously, and then the preselected new winding tap is switched on, the load current flows to the neutral outlet state through the first change-over switch T1, the first vacuum tube V1, and finally the new winding tap in the pre-selected state is turned on, and the load current flows to the neutral outlet state through the main switch connected to the new winding tap in the pre-selected state.
6. The handover control method according to claim 5, wherein: during the switching from the first winding tap N to the second winding tap N +1, the transition circuit forms a bridge connection in step S7, and generates a circulating current Ic, wherein the circulating current Ic passed by the first switch T1 is in the same direction as the load current, and the circulating current Ic passed by the second switch T2 is in the opposite direction to the load current.
7. The handover control method according to claim 5, wherein: during the process of switching from the second winding tap N +1 to the first winding tap N, the transition circuit in the 7 th time sequence forms a bridge connection, and generates a circulating current Ic, wherein the circulating current Ic passed by the first switch T1 is opposite to the direction of the load current, and the circulating current Ic passed by the second switch T2 is the same as the direction of the load current.
8. The handover control method according to claim 6 or 7, wherein: the state in which the transition circuit forms a bridge is maintained for 5-10ms during the switching.
9. The handover control method according to claim 5, wherein: the switching time of the on-load change-over switch from the current winding tap to the preselected new winding tap is 100ms to 110 ms.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110296132.3A CN113113261B (en) | 2021-03-19 | 2021-03-19 | Double-vacuum-tube reciprocating transition circuit of vacuum on-load tap-changer and switching control method thereof |
| PCT/CN2021/108798 WO2022193522A1 (en) | 2021-03-19 | 2021-07-28 | Vacuum on-load tap changer double vacuum tube reciprocating transition circuit and switching control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110296132.3A CN113113261B (en) | 2021-03-19 | 2021-03-19 | Double-vacuum-tube reciprocating transition circuit of vacuum on-load tap-changer and switching control method thereof |
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| CN113113261A true CN113113261A (en) | 2021-07-13 |
| CN113113261B CN113113261B (en) | 2022-09-27 |
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| WO (1) | WO2022193522A1 (en) |
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| CN113744981A (en) * | 2021-08-05 | 2021-12-03 | 广东云舜综合能源科技有限公司 | Trip gear voltage regulating transformer |
| WO2022193522A1 (en) * | 2021-03-19 | 2022-09-22 | 北京航天控制仪器研究所 | Vacuum on-load tap changer double vacuum tube reciprocating transition circuit and switching control method thereof |
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| WO2011157316A1 (en) * | 2010-06-18 | 2011-12-22 | Maschinenfabrik Reinhausen Gmbh | On-load tap changer |
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| CN113113261B (en) * | 2021-03-19 | 2022-09-27 | 北京航天控制仪器研究所 | Double-vacuum-tube reciprocating transition circuit of vacuum on-load tap-changer and switching control method thereof |
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Also Published As
| Publication number | Publication date |
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| WO2022193522A1 (en) | 2022-09-22 |
| CN113113261B (en) | 2022-09-27 |
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