CN112670067B - Symmetrical vacuum bubble load balancing transition circuit device and control method - Google Patents
Symmetrical vacuum bubble load balancing transition circuit device and control method Download PDFInfo
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- CN112670067B CN112670067B CN202011295536.2A CN202011295536A CN112670067B CN 112670067 B CN112670067 B CN 112670067B CN 202011295536 A CN202011295536 A CN 202011295536A CN 112670067 B CN112670067 B CN 112670067B
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0038—Tap change devices making use of vacuum switches
Abstract
The invention provides a symmetrical vacuum bubble load balancing transition circuit device and a control method, and belongs to the technical field of tap switches. The device of the invention comprises: transfer switch Z1, transfer switch Z2, circulation vacuum interrupters RV1 and RV2, load current vacuum interrupter MV, main switches MC1 and MC2 and transition resistor R. The time sequence of the transition process of the invention from the odd gear to the even gear and from the even gear to the odd gear is mirror symmetry, and for the reciprocating motion change switch, the operation of 'rail change' of a mechanical transmission mechanism in the reciprocating motion change process is avoided, the mechanical complexity is reduced, and the reliability of the switch is improved.
Description
Technical Field
The present invention relates to the field of tap changer technology, and more particularly, to a transition circuit device for load balancing of symmetric vacuum bubbles and a control method thereof.
Background
The on-load tap-changer is a switching device for providing constant voltage for a transformer when the load changes, and the basic principle is that under the condition of ensuring that the load current is not interrupted, the switching between taps in the transformer winding is realized, 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 oil in the oil chamber of the tap changer can not be carbonized and polluted, the oil does not need to be purified, the burning corrosion of the contact in the vacuum tube can be reduced to the minimum, and the on-load tap changer mainly comprises a change-over switch, a conversion selector and an electric mechanism.
The on-load tap-changer is provided with load switching, a transition circuit and a selection circuit are needed, different voltage regulation modes require different voltage regulation circuits, therefore, the circuit of the on-load tap-changer consists of the transition circuit, the selection circuit and the voltage regulation circuit, the transition circuit is a series resistance circuit bridged between tapping points, the corresponding mechanism is a change-over switch or a selection switch, and the change-over switch is a tapping point of a transformer winding under a charged state. The tap changer adopts the principle of a transition circuit to realize tap changing operation. The transition circuit has single resistance, double resistance, four resistance or multiple resistance transition according to the number of the transition circuit resistance, and can be combined to form various transition circuits according to the contact fracture having single fracture, double fracture and the like. The transition circuit and the switching program have different influences on the contact task of the change-over switch, and whether the electric arc can be reliably extinguished in the first half cycle is limited or not depends on the required switching task to a great extent.
The mechanical change-over switch in the switching core of the prior on-load tap-changer is more in quantity, and generally comprises 2 main circuit switches and 2 auxiliary change-over switches for one pole, so that the mechanical structure is more complex. The vacuum circuit breaker which is not connected with the transition resistor in the on-load tap changer is a load vacuum circuit breaker and only bears the task of switching on and off load current; the vacuum circuit breaker connected with the transition resistor is a circulating current vacuum circuit breaker, and only bears the task of breaking internal circulating current, according to the experience of extra-high voltage direct current engineering, a load current single-column winding of the converter transformer is generally 500-600A, the internal circulating current flowing on the transition resistor is about 900-1000A, and the internal circulating current passing through the circulating current vacuum circuit breaker is obviously larger than the load current, so that after multiple times of switching, the ablation degree of the load vacuum circuit breaker and the circulating current vacuum circuit breaker is different, and the switching burden and the electrical damage of the circulating current vacuum circuit breaker are more serious.
Disclosure of Invention
In order to solve the above problems, the present invention provides a symmetrical vacuum bubble load balancing transition circuit device, comprising:
a transfer switch Z1, wherein the transfer switch Z1 has four electrodes a, b, c and d and an action arm, the two electrodes a and b are respectively connected with the odd-numbered stages of the on-load tap-changer selector, the two electrodes c and d are respectively connected with the even-numbered stages of the on-load tap-changer selector, and the action arm is rotatably connected with any one of the four electrodes a, b, c and d;
a transfer switch Z2, wherein the transfer switch Z2 has two electrodes e and f and an action arm, the two electrodes e and f are respectively connected with the odd gear or the even gear of the on-load tap-changer selector, and the action arm is rotatably connected with any one of the two electrodes e and f;
circulation vacuum circuit breakers RV1 and RV2, the circulation vacuum circuit breakers RV1 and RV2 are used for cutting circulation between two gears when odd gears are switched to even gears or even gears are switched to odd gears;
a load current vacuum circuit breaker MV for cutting off a load current when an odd-numbered stage is switched to an even-numbered stage and an even-numbered stage is switched to an odd-numbered stage;
main switches MC1 and MC2, wherein the main switches MC1 and MC2 are used for switching normal through current of odd gears and even gears;
and the transition resistor R is used for limiting the circulating current between the odd gears and the even gears when the transition circuit is communicated with the odd gears and the even gears simultaneously.
Optionally, the circulating current vacuum circuit breakers RV1 and RV2, the RV1 is connected to one end of two electrodes a and b of the change-over switch Z1, and the RV2 is connected to one end of two electrodes c and d of the change-over switch Z1.
Optionally, the fixed end of the switch action arm of the change-over switch Z1 is connected to one end of a transition resistor R, and is connected to the neutral point of the transformer through the transition resistor R.
Optionally, a fixed end of the switching arm of the transfer switch Z2 is connected to one end of a load current vacuum circuit breaker MV, and the transformer neutral point is connected through the load current vacuum circuit breaker MV.
Optionally, the main switches MC1 and MC2 are respectively connected between the odd-numbered stage and the even-numbered stage of the on-load tap-changer and the neutral point of the transformer.
Optionally, when the shift position of the on-load tap-changer is in an odd shift position, the main switch MC1 is closed, and the main switch MC2 is opened;
the action arm of the change-over switch Z1 is conducted with the a electrode, and the action arm of the change-over switch Z2 is conducted with the e electrode;
the load current vacuum circuit breaker MV is conducted, the circulating current vacuum circuit breakers RV1 and RV2 are disconnected, the load current is connected to the neutral point output through the main switch MC1, meanwhile, the e electrode of the change-over switch Z2 is connected in parallel, and the load current circuit breaker MV outputs.
Optionally, when the gear of the on-load tap-changer is in even tap, the main switch MC2 is closed and MC1 is open;
the action arm of the change-over switch Z1 is conducted with the c electrode, and the action arm of the change-over switch Z2 is conducted with the f electrode;
the load current vacuum circuit breaker MV is conducted, the circulating current vacuum circuit breakers RV1 and RV2 are disconnected, the load current is connected to the neutral point output through the main switch MC1, meanwhile, the f electrode of the action arm of the change-over switch Z2 is connected in parallel, and the load current circuit breaker MV outputs.
The invention also provides a control method of the transition circuit device using the symmetrical vacuum bubble load balance, wherein the transition circuit device comprises the following steps: transfer switch Z1, transfer switch Z2, circulation vacuum interrupters RV1 and RV2, load current vacuum interrupter MV, main switches MC1 and MC2 and transition resistor R, comprising:
the action arm of the change-over switch Z1 and two electrodes a and b are respectively connected to the odd-numbered stage of the on-load tap-changer selector, and the action arm of the change-over switch Z1 and two electrodes c and d are respectively connected to the even-numbered stage of the on-load tap-changer selector;
the action arm of the change-over switch Z2 and the electrodes e and f are respectively connected with the odd gear or the even gear of the on-load tap-changer selector;
the circulating current vacuum circuit breakers RV1 and RV2 are used for cutting off circulating current between two gears when odd gears are switched to even gears or even gears are switched to odd gears;
the load current vacuum circuit breaker MV is used for cutting off the load current when the odd gear is switched to the even gear and the even gear is switched to the odd gear;
the main switches MC1 and MC2 are used for switching the normal through current of odd gears and even gears;
the transition resistor R is used for limiting the circulating current between the odd gears and the even gears when the transition circuit is communicated with the odd gears and the even gears simultaneously.
Optionally, the on-load tap changer is switched from an odd gear to an even gear, and includes:
the main switch MC1 is opened;
the action arm of the change-over switch Z1 is switched from the electrode a to the electrode b;
closing circulating current vacuum breakers RV1 and RV 2;
disconnecting the load current vacuum circuit breaker MV;
after the electric arc in the load current vacuum circuit breaker MV is completely extinguished, switching an action arm of a change-over switch Z2 from a connection e electrode to a connection f electrode;
closing the load current vacuum circuit breaker MV and simultaneously connecting an odd gear and an even gear;
opening circulating current vacuum circuit breakers RV1 and RV 2;
after the arc in the circulating current vacuum circuit breaker RV1 is completely extinguished, switching an action arm of a change-over switch Z1 from a b electrode to a c electrode;
the main switch MC2 is closed.
Optionally, the on-load tap changer is switched from an even gear to an odd gear, and includes:
the main switch MC2 is opened;
the action arm of the change-over switch Z1 is switched from the c electrode to the d electrode;
closing circulating current vacuum breakers RV1 and RV 2;
disconnecting the load current vacuum circuit breaker MV;
after the electric arc in the load current vacuum circuit breaker MV is completely extinguished, switching an action arm of a change-over switch Z2 from an f electrode to an e electrode;
closing the load current vacuum circuit breaker MV and simultaneously connecting an even gear and an odd gear;
opening circulating current vacuum circuit breakers RV1 and RV 2;
after the arc in the circulating current vacuum circuit breaker RV2 is completely extinguished, switching an action arm of a change-over switch Z1 from a d electrode to an a electrode;
the main switch MC1 is closed.
Compared with the prior art, the invention has the following excellent effects:
the time sequence of the transition process from the odd gear to the even gear and from the even gear to the odd gear is mirror symmetry, and for the reciprocating motion change switch, the operation of 'rail change' of a mechanical transmission mechanism in the reciprocating change process is avoided, the mechanical complexity is reduced, and the reliability of the switch is improved;
the task of passing and cutting off the circulation is alternately borne by the two circulation vacuum circuit breakers RV1 and RV2, the switching task of only one auxiliary vacuum bubble in the existing topology is shared, the switching capacity of the vacuum circuit breaker and the auxiliary vacuum circuit breaker is balanced, and the electrical service life of the whole switch is greatly prolonged.
Drawings
FIG. 1 is a diagram of a transition circuit device with balanced load of symmetrical vacuum bubbles according to the present invention;
fig. 2 is a transition circuit schematic diagram B of an on-load tap-changer according to an embodiment of the present invention;
fig. 3 is a transition circuit schematic diagram C of an on-load tap changer according to an embodiment of the present invention;
fig. 4 is a schematic diagram D of a transition circuit of an on-load tap changer according to an embodiment of the present invention;
fig. 5 is a transition circuit schematic diagram E of an on-load tap changer according to an embodiment of the present invention;
fig. 6 is a transition circuit schematic diagram F of an on-load tap changer according to an embodiment of the present invention;
fig. 7 is a transition circuit schematic diagram G of an on-load tap changer according to an embodiment of the present invention;
fig. 8 is a transition circuit diagram H of an on-load tap changer according to an embodiment of the present invention;
fig. 9 is a schematic diagram I of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 10 is a transition circuit transition diagram J of an on-load tap changer according to an embodiment of the present invention;
fig. 11 is a schematic diagram I of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 12 is a transition circuit transition diagram J of an on-load tap changer according to an embodiment of the present invention;
fig. 13 is a transition circuit schematic diagram I of an on-load tap changer according to an embodiment of the present invention;
fig. 14 is a transition circuit transition diagram J of an on-load tap changer according to an embodiment of the present invention;
fig. 15 is a transition circuit schematic diagram K of an on-load tap changer according to an embodiment of the present invention;
fig. 16 is a transition circuit diagram L of an on-load tap changer according to an embodiment of the present invention;
fig. 17 is a transition circuit diagram M of an on-load tap changer according to an embodiment of the present invention;
fig. 18 is a transition circuit transition diagram N of an on-load tap changer according to an embodiment of the present invention;
fig. 19 is a transition circuit schematic diagram O of an on-load tap changer according to an embodiment of the present invention;
fig. 20 is a transition circuit schematic diagram P of an on-load tap-changer according to an embodiment of the present invention;
fig. 21 is a schematic diagram of an N → N +1 transition procedure for an on-load tap changer according to an embodiment of the present invention;
fig. 22 is a schematic diagram of an on-load tap changer transition circuit transition from N +1 → N transition procedure in an embodiment of the present invention;
fig. 23 is a block diagram of an on-load tap-changer transition circuit with 2 transition resistors in accordance with an embodiment of the present invention;
FIG. 24 is a state diagram illustrating the switching timing of the switch Z1 according to the present invention;
FIG. 25 is a state diagram illustrating the switching timing of the switch Z1 according to the embodiment of the present invention;
FIG. 26 is a flowchart of a control method for a transition circuit device using symmetrical vacuum bubble load balancing according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same unit/element is denoted by the same reference numeral.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a symmetrical vacuum bubble load balancing transition circuit device, as shown in fig. 1, comprising:
a transfer switch Z1, wherein the transfer switch Z1 has four electrodes a, b, c and d and an action arm, the two electrodes a and b are respectively connected with the odd-numbered stages of the on-load tap-changer selector, the two electrodes c and d are respectively connected with the even-numbered stages of the on-load tap-changer selector, and the action arm is rotatably connected with any one of the four electrodes a, b, c and d;
a transfer switch Z2, wherein the transfer switch Z2 has two electrodes e and f and an action arm, the two electrodes e and f are respectively connected with the odd gear or the even gear of the on-load tap-changer selector, and the action arm is rotatably connected with any one of the two electrodes e and f;
circulation vacuum circuit breakers RV1 and RV2, the circulation vacuum circuit breakers RV1 and RV2 are used for cutting circulation between two gears when odd gears are switched to even gears or even gears are switched to odd gears;
a load current vacuum circuit breaker MV for cutting off a load current when an odd-numbered stage is switched to an even-numbered stage and an even-numbered stage is switched to an odd-numbered stage;
main switches MC1 and MC2, wherein the main switches MC1 and MC2 are used for switching normal through current of odd gears and even gears;
and the transition resistor R is used for limiting the circulating current between the odd gears and the even gears when the transition circuit is communicated with the odd gears and the even gears simultaneously.
And the circulating current vacuum circuit breakers RV1 and RV2, the RV1 is connected with one ends of two electrodes a and b of the change-over switch Z1, and the RV2 is connected with one ends of two electrodes c and d of the change-over switch Z1.
The fixed end of the switch action arm of the change-over switch Z1 is connected with one end of a transition resistor R and is connected to the neutral point of the transformer through the transition resistor R.
The fixed end of the switching arm of the changeover switch Z2 is connected to one end of a load current vacuum breaker MV, and is connected to the transformer neutral point via the load current vacuum breaker MV.
The main switches MC1 and MC2 are respectively connected between the odd-numbered gear and the even-numbered gear of the on-load tap-changer and the neutral point of the transformer.
When the gear of the on-load tap-changer is in an odd gear, the main switch MC1 is closed, and the MC2 is opened;
the action arm of the change-over switch Z1 is conducted with the a electrode, and the action arm of the change-over switch Z2 is conducted with the e electrode;
the load current vacuum circuit breaker MV is conducted, the circulating current vacuum circuit breakers RV1 and RV2 are disconnected, the load current is connected to the neutral point output through the main switch MC1, meanwhile, the e electrode of the change-over switch Z2 is connected in parallel, and the load current circuit breaker MV outputs.
When the gear of the on-load tap-changer is in even tap, the main switch MC2 is closed and the MC1 is opened;
the action arm of the change-over switch Z1 is conducted with the c electrode, and the action arm of the change-over switch Z2 is conducted with the f electrode;
the load current vacuum circuit breaker MV is conducted, the circulating current vacuum circuit breakers RV1 and RV2 are disconnected, the load current is connected to the neutral point output through the main switch MC1, meanwhile, the f electrode of the action arm of the Z2 switch is connected in parallel, and the load current circuit breaker MV outputs.
The invention will be further illustrated by the following examples
The transition circuit device of the vacuum on-load tap-changer in the embodiment comprises a change-over switch Z1, a change-over switch Z2, circulating current vacuum circuit breakers RV1 and RV2, load current vacuum circuit breakers MV and transition resistors R, wherein the number of the transition resistors R can be multiple, and main circuits of odd gears and even gears of the switches are respectively provided with main switches MC1 and MC 2;
the transfer switch Z1 has four electrodes a, b, c and d in total, the electrodes a and b are respectively connected with the odd-numbered stages of the on-load tap-changer tapping selector, the electrodes c and d are respectively connected with the even-numbered stages of the on-load tap-changer tapping selector, and the fixed end of the action arm of the Z1 transfer switch is connected with the transition resistor R;
a change-over switch Z2, which has two electrodes of e and f; e. the f electrode is respectively connected with the odd gear and the even gear of the on-load tap changer tapping selector, and the fixed end of the Z2 switch action arm is connected with the neutral point of the transformer through a load current vacuum circuit breaker MV;
the circulation vacuum circuit breaker RV1 is used for cutting circulation between two gears when odd-numbered gears are switched to even-numbered gears, and the circulation vacuum circuit breaker RV2 is used for cutting circulation between two gears when even-numbered gears are switched to odd-numbered gears.
The load current vacuum circuit breaker MV is used to cut off the load current when the odd-numbered stage is switched to the even-numbered stage and the even-numbered stage is switched to the odd-numbered stage.
The main switches MC1 and MC2 are used to switch the normal through-current before and after completion.
The operation process of the transition circuit is as follows:
assuming that the initial position of a conversion selector of a tapping selector of the on-load tapping switch is unchanged, and the gear number of the on-load tapping switch is consistent with the contact group number of the tapping selector, the gear of the on-load tapping switch is required to be raised from an odd gear to an even gear.
When the gears of the on-load tap-changer are in odd-numbered tapping, as shown in fig. 1, the main switch MC1 is closed, the main switch MC2 is opened, the moving contact of the action arm of the change-over switch Z1 is conducted with the a electrode, the moving contact of the action arm of the change-over switch Z2 is conducted with the e electrode, the load current vacuum circuit breaker MV is conducted, the circulating vacuum circuit breakers RV1 and RV2 are disconnected, and the load current I is conductedNThe main switch MC1 is connected to neutral output, and the Z2 e contact is connected in parallel with the output of the load current breaker MV.
When the tap changer is switched from an odd gear to an even gear, the operation steps of the transition circuit comprise:
as shown in FIG. 2, the main switch MC1 is turned off and the odd-numbered stage load current INFlows through the change-over switch Z2 and the load current breaker MV output;
as shown in fig. 3, the movable contact of the actuating arm of the change-over switch Z1 is changed from a to b, at this time, the Z1 switch is not electrified, and the Z1 switch is still connected to the odd-numbered stages of the switch;
as shown in FIG. 4, the circulating current vacuum breakers RV1 and RV2 are closed simultaneously, and the load current I of odd-numbered gearNThe current flows through a change-over switch Z2 and the output of a load current breaker MV, and is connected with a transition resistor R and a circulating current breaker RV1 in parallel and is output through a contact of a change-over switch Z1 b;
as shown in fig. 5, the load current vacuum circuit breaker MV is opened and the load current I is interruptedNWhen an arc is generated and extinguished, the load current I of odd-numbered gearsNSequentially flows through a transition resistor R, a circulating current vacuum circuit breaker RV1 and a change-over switch Z1 b contact for output, and the recovery voltage U at the two ends of the load vacuum circuit breaker MVMV＝IN×R；
As shown in fig. 6, after the arc in the load current vacuum circuit breaker MV is completely extinguished, the moving arm of the transfer switch Z2 is switched from the e-fixed contact to the f-fixed contact, and the odd-numbered load current INSequentially flows through a transition resistor R, a circulating current vacuum circuit breaker RV1 and a change-over switch Z1 b contact for output;
as shown in fig. 7, when the load current vacuum circuit breaker MV is closed, the transition circuit connects the odd-numbered stage and the even-numbered stage at the same time to form a bridge connection, thereby generating a circulating current
At this time, the load current is transferred from the odd-numbered stage to the even-numbered stage, and the even-numbered stage load current INThrough the transfer switch Z2 f contact and the load current vacuum interrupter MV output; current I flowing through the load current vacuum circuit breaker MVMV＝IN+ICWherein said U isSIs an on-load tap-changer level voltage;
as shown in FIG. 8, both the circulating vacuum breakers RV1 and RV2 are opened simultaneously, wherein RV1 pulls the circulating current IC1Generating an electric arc, wherein RV2 is in an uncharged flow action; even-numbered stage load current INThrough the transfer switch Z2 f contact and the load current vacuum interrupter MV output; the recovery voltage at two ends of the circulating current vacuum circuit breaker RV1 is URV1＝US；
As shown in fig. 9, after the arc in the circulating vacuum circuit breaker RV1 is completely extinguished, the moving contact of the actuating arm of the change-over switch Z1 is changed from b to c, and the even-numbered stage load current INThrough the transfer switch Z2 f contact and the load current vacuum interrupter MV output.
As shown in FIG. 10, main switch MC2 is closed and even-numbered stage load current INThe current flows through the output of the main switch MC2, and simultaneously, the output of a contact of a parallel change-over switch Z2 f and a load current breaker MV are connected, at the moment, the tapping change-over operation is finished, and the change-over switch finishes the voltage regulation of changing from an odd gear to an even gear.
When the gear of the on-load tap-changer is in even-numbered tapping, as shown in fig. 11, the main switch MC2 is closed, the main switch MC1 is opened, the moving contact of the action arm of the change-over switch Z1 is connected with the fixed contact c, the moving contact of the action arm of the change-over switch Z2 is connected with the fixed contact f, the load current vacuum circuit breaker MV is connected, the circulating current vacuum circuit breakers RV1 and RV2 are disconnected, and the load current I is connectedNThe main switch MC2 is connected to neutral output, and the Z2 f contact and the load current breaker MV output are connected in parallel.
When the tap changer is switched from an even gear to an odd gear, the operation steps of the transition circuit comprise:
as shown in fig. 12, the main switch MC2 is turned off and the even-numbered stage load current INThrough the transfer switch Z2, the load current breaker MV output.
As shown in fig. 13, when the moving contact of the actuating arm of the change-over switch Z1 is changed from c to d, the switch Z1 is not electrified, and the switch Z1 is still connected to the even-numbered stage of the switch.
As shown in fig. 14, the circulating vacuum circuit breakers RV1, RV2 are closed simultaneously, and the odd-numbered load current INFlows through the change-over switch Z2 and the output of the load current breaker MV, and is connected with the transition resistor R and the circulating current breaker RV2 in parallel and output through the contact of the change-over switch Z1 d.
As shown in fig. 15, the load current vacuum circuit breaker MV is opened to cut off the load current INGenerating an arc, after the arc is extinguished, the odd-numbered load current INSequentially flows through a transition resistor R, a circulating current vacuum circuit breaker RV2 and a change-over switch Z1 d contact head for output, and the two ends of the load vacuum circuit breaker MV are provided withRecovery voltage UMV＝IN×R；
As shown in fig. 16, after the arc in the load current vacuum circuit breaker MV is completely extinguished, the actuating arm of the transfer switch Z2 is switched from the fixed contact f to the fixed contact e, and the even-numbered stage load current INSequentially flows through a transition resistor R, a circulating current vacuum circuit breaker RV2 and a change-over switch Z1 d contact for output;
as shown in fig. 17, when the load current vacuum circuit breaker MV is closed, the transition circuit connects the even-numbered stage and the odd-numbered stage at the same time to form a bridge connection, and a circulating current is generated
At the moment, the load current is transferred from even gear to odd gear, and the load current I of odd gearNCurrent I flowing through the diverter switch Z2 e contact and the load current vacuum interrupter MV outputMV＝IN+IC(ii) a Wherein, USIs an on-load tap-changer level voltage;
as shown in fig. 18, the circulating vacuum breakers RV1, RV2 are opened simultaneously, wherein RV2 pulls the circulation I apartCGenerating an arc, wherein RV1 does not have an electric current flow; even-numbered stage load current INThe recovered voltage of the current through the contact of the change-over switch Z2 e and the output of the load current vacuum circuit breaker MV is U at the two ends of the circulating current vacuum circuit breaker RV2RV2＝US；
As shown in fig. 19, after the arc in the circulating vacuum circuit breaker RV2 is completely extinguished, the moving contact of the actuating arm of the change-over switch Z1 is changed from d to a fixed contact, and the odd-numbered stage load current INThrough the transfer switch Z2 e contact and the load current vacuum interrupter MV output;
as shown in FIG. 20, the main switch MC1 is closed, and the odd-numbered stage load current INFlows through the output of the main switch MC1, and is simultaneously connected with the contact of the parallel change-over switch Z2 e and the output of the load current circuit breaker MV. At this time, the tap changing operation is finished, and the change-over switch completes the voltage regulation of switching from the even gear to the odd gear.
When the tap selector is switched from odd to even taps, the transition circuit switching sequence is schematically illustrated in fig. 21.
When the tap selector is switched from even taps to odd taps, the transition circuit switching sequence is schematically illustrated in fig. 22.
The tasks of the vacuum circuit breaker of the vacuum on-load tap-changer transition circuit in the embodiment are shown in the following table:
wherein N is the number of times of gear shifting of the tap changer, INIs the load current; us is the on-load tap-changer stage voltage and R is the transition resistance.
As shown in fig. 23, in a modified embodiment of the load transfer switch according to the present invention of the on-load tap changer, the transition resistor R according to the present invention is not disposed as one branch, but is changed into two branches R1 and R2, and the position of the transition resistor R is not disposed between the fixed end of the actuating arm of the transfer switch Z1 and the neutral point, but disposed between the vacuum circuit breaker RV1 and RV2, and between the odd-numbered and even-numbered branches, respectively, so that the advantage of this arrangement is that the two branches R1 and R2 are used to alternately bear the load current and the circulating current when the odd-numbered branch is switched to the even-numbered branch and the even-numbered branch is switched to the odd-numbered branch, and the two branches alternately operate and dissipate heat, so that the temperature of the transition resistor can be reduced, thereby avoiding the degradation of the gas generation and the reduction of the insulation performance of the transformer oil due to the excessively high temperature of the transition resistor, and greatly improving the electrical life of the entire switch.
As shown in fig. 24, in the unidirectional rotation design scheme and the switching timing state of the change-over switch Z1, when the tap switch is switched from the odd tap to the even tap, the moving contact of the Z1 switch is connected to the odd tap at the fixed contact a, the initial state of the switch Z1 is state 0, when the change-over switch is operated for the 1 st time, the moving contact of the Z1 switch rotates 90 °, the moving contact is changed to be connected to the fixed contact b, and is connected to the odd tap, and the state is changed from state 0 to state 1; when the change-over switch acts for the 2 nd time, the action arm of the Z1 switch rotates by 90 degrees, the moving contact is changed into a connecting static contact c and is connected with an even tap, the state is changed from the state 1 into the state 2, when the tap switch is switched from the even tap to the odd tap, the moving contact of the Z1 switch is at the static contact c and is connected with the even tap, and the initial state of the switch Z1 is the state 0; when the change-over switch acts for the 1 st time, the action arm of the Z1 switch rotates 90 degrees, the moving contact is converted into a connecting static contact d and connected with even tapping, and the state is converted from the state 0 into the state 1; when the change-over switch acts for the 2 nd time, the action arm of the Z1 switch rotates by 90 degrees, the moving contact is converted into a connecting static contact a and is connected with an odd number of taps, and the state is converted from the state 1 into the state 2.
As shown in fig. 25, the changeover switch Z1 is of a reciprocating swing type design and switches timing states. When the tap switch is switched from odd tap to even tap, the moving contact of the Z1 switch is at the static contact a and is connected with the odd tap, and the initial state of the switch Z1 is state 0; when the change-over switch acts for the 1 st time, the action arm of the Z1 switch rotates at a small angle, the moving contact is converted into a connecting static contact b and is connected with an odd number of taps, and the state is converted from the state 0 into the state 1; when the change-over switch acts for the 2 nd time, the action arm of the Z1 switch rotates in a large angle, the moving contact slides through the static contact d, is connected with the static contact c and is connected with even number tapping, and the state is changed from the state 1 to the state 2. When the tap switch is switched from even tapping to odd tapping, the moving contact of the Z1 switch is at the static contact c and is connected with the even tapping, and the initial state of the switch Z1 is state 0; when the change-over switch acts for the 1 st time, the action arm of the Z1 switch rotates at a small angle, the moving contact is converted into a connecting static contact d and connected with even tapping, and the state is converted from the state 0 into the state 1; when the change-over switch acts for the 2 nd time, the action arm of the Z1 switch rotates by a large angle, the moving contact slides over the static contact b, is connected with the static contact a and is connected with the odd tapping, and the state is changed from the state 1 to the state 2.
The invention also provides a control method of the transition circuit device using the symmetrical vacuum bubble load balance, wherein the transition circuit device comprises the following steps: the transfer switch Z1, the transfer switch Z2, the circulation vacuum breakers RV1 and RV2, the load current vacuum breaker MV, the main switches MC1 and MC2 and the transition resistor R, as shown in fig. 26, include:
the action arm of the change-over switch Z1 and two electrodes a and b are respectively connected to the odd-numbered stage of the on-load tap-changer selector, and the action arm of the change-over switch Z1 and two electrodes c and d are respectively connected to the even-numbered stage of the on-load tap-changer selector;
the action arm of the change-over switch Z2 and the electrodes e and f are respectively connected with the odd gear or the even gear of the on-load tap-changer selector;
the circulating current vacuum circuit breakers RV1 and RV2 are used for cutting off circulating current between two gears when odd gears are switched to even gears or even gears are switched to odd gears;
the load current vacuum circuit breaker MV is used for cutting off the load current when the odd gear is switched to the even gear and the even gear is switched to the odd gear;
the main switches MC1 and MC2 are used for switching the normal through current of odd gears and even gears;
the transition resistor R is used for limiting the circulating current between the odd gears and the even gears when the transition circuit is communicated with the odd gears and the even gears simultaneously.
Optionally, the on-load tap changer is switched from an odd gear to an even gear, and includes:
the main switch MC1 is opened;
the action arm of the change-over switch Z1 is switched from the electrode a to the electrode b;
closing circulating current vacuum breakers RV1 and RV 2;
disconnecting the load current vacuum circuit breaker MV;
after the electric arc in the load current vacuum circuit breaker MV is completely extinguished, switching an action arm of a change-over switch Z2 from a connection e electrode to a connection f electrode;
closing the load current vacuum circuit breaker MV and simultaneously connecting an odd gear and an even gear;
opening circulating current vacuum circuit breakers RV1 and RV 2;
after the arc in the circulating current vacuum circuit breaker RV1 is completely extinguished, switching an action arm of a change-over switch Z1 from a b electrode to a c electrode;
the main switch MC2 is closed.
Optionally, the on-load tap changer is switched from an even-numbered stage to an odd-numbered stage, and includes:
the main switch MC2 is opened;
the action arm of the change-over switch Z1 is switched from the c electrode to the d electrode;
closing circulating current vacuum breakers RV1 and RV 2;
disconnecting the load current vacuum circuit breaker MV;
after the electric arc in the load current vacuum circuit breaker MV is completely extinguished, switching an action arm of a change-over switch Z2 from an f electrode to an e electrode;
closing the load current vacuum circuit breaker MV and connecting an even gear and an odd gear at the same time;
opening circulating current vacuum circuit breakers RV1 and RV 2;
after the arc in the circulating current vacuum circuit breaker RV2 is completely extinguished, switching an action arm of a change-over switch Z1 from a d electrode to an a electrode;
the main switch MC1 is closed.
Compared with the prior art, the invention has the following excellent effects:
the time sequence of the transition process from the odd gear to the even gear and from the even gear to the odd gear is mirror symmetry, and for the reciprocating motion change switch, the operation of 'rail change' of a mechanical transmission mechanism in the reciprocating change process is avoided, the mechanical complexity is reduced, and the reliability of the switch is improved;
the task of passing and cutting off the circulation is alternately borne by the two circulation vacuum circuit breakers RV1 and RV2, the switching task of only one auxiliary vacuum bubble in the existing topology is shared, the switching capacity of the vacuum circuit breaker and the auxiliary vacuum circuit breaker is balanced, and the electrical service life of the whole switch is greatly prolonged.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A symmetrical vacuum bubble load balancing transition circuit apparatus, the apparatus comprising:
a transfer switch Z1, wherein the transfer switch Z1 has four electrodes a, b, c and d and an action arm, the two electrodes a and b are respectively connected with the odd-numbered stages of the on-load tap-changer selector, the two electrodes c and d are respectively connected with the even-numbered stages of the on-load tap-changer selector, and the action arm is rotatably connected with any one of the four electrodes a, b, c and d;
a transfer switch Z2, the transfer switch Z2 has two electrodes e and f and an action arm, the two electrodes e and f are respectively connected with the odd gear or the even gear of the on-load tap-changer selector, and the action arm is rotationally connected with any one of the two electrodes e and f;
the circulation vacuum circuit breakers RV1 and RV2, wherein the circulation vacuum circuit breakers RV1 and RV2 are used for cutting circulation between two gears when the odd gears are switched to the even gears or the even gears are switched to the odd gears;
a load current vacuum circuit breaker MV for cutting off a load current when an odd-numbered stage is switched to an even-numbered stage and an even-numbered stage is switched to an odd-numbered stage;
main switches MC1 and MC2, wherein the main switches MC1 and MC2 are used for switching normal through current of odd gears and even gears;
and the transition resistor R is used for limiting the circulating current between the odd gears and the even gears when the transition circuit is communicated with the odd gears and the even gears simultaneously.
2. The apparatus of claim 1, said circulating vacuum circuit breakers RV1 and RV2, said RV1 being connected to one end of both electrodes a and b of transfer switch Z1, said RV2 being connected to one end of both electrodes c and d of transfer switch Z1.
3. The apparatus of claim 1, wherein the fixed end of the switching arm of the transfer switch Z1 is connected to one end of a transition resistor R, and is connected to the neutral point of the transformer through the transition resistor R.
4. The apparatus of claim 1, wherein the fixed end of the switching arm of the transfer switch Z2 is connected to one end of a load current vacuum circuit breaker MV, and the neutral point of the transformer is connected through the load current vacuum circuit breaker MV.
5. The apparatus of claim 1, the main switches MC1 and MC2 are connected between the on-load tap changer tap selector odd and even gears, respectively, and the transformer neutral.
6. The device of claim 1, wherein when the gear position of the on-load tap changer is in an odd gear position, the main switch MC1 is closed, and the MC2 is opened;
the action arm of the change-over switch Z1 is conducted with the a electrode, and the action arm of the change-over switch Z2 is conducted with the e electrode;
the load current vacuum circuit breaker MV is conducted, the circulating current vacuum circuit breakers RV1 and RV2 are disconnected, the load current is connected to the neutral point output through the main switch MC1, meanwhile, the e electrode of the change-over switch Z2 is connected in parallel, and the load current circuit breaker MV outputs.
7. The arrangement of claim 1, wherein when the gear position of the on-load tap changer is in even tap, the main switch MC2 is closed and the MC1 is open;
the action arm of the change-over switch Z1 is conducted with the c electrode, and the action arm of the change-over switch Z2 is conducted with the f electrode;
the load current vacuum circuit breaker MV is conducted, the circulating current vacuum circuit breakers RV1 and RV2 are disconnected, the load current is connected to the neutral point output through the main switch MC1, meanwhile, the f electrode of the action arm of the change-over switch Z2 is connected in parallel, and the load current circuit breaker MV outputs.
8. A control method for a transition circuit arrangement using symmetrical vacuum bubble load balancing, the transition circuit arrangement comprising: transfer switch Z1, transfer switch Z2, circulation vacuum interrupters RV1 and RV2, load current vacuum interrupter MV, main switches MC1 and MC2 and transition resistor R, the method comprising:
an action arm and two electrodes a and b of a change-over switch Z1 are respectively connected to an odd-numbered stage of an on-load tap-changer selector, and an action arm and two electrodes c and d of a change-over switch Z1 are respectively connected to an even-numbered stage of the on-load tap-changer selector;
the action arm of the change-over switch Z2 and the electrodes e and f are respectively connected with the odd gear or the even gear of the on-load tap-changer selector;
the circulating current vacuum circuit breakers RV1 and RV2 are used for cutting off circulating current between two gears when odd gears are switched to even gears or even gears are switched to odd gears;
the load current vacuum circuit breaker MV is used for cutting off the load current when the odd gear is switched to the even gear and the even gear is switched to the odd gear;
the main switches MC1 and MC2 are used for switching the normal through current of odd gears and even gears;
the transition resistor R is used for limiting the circulating current between the odd gears and the even gears when the transition circuit is communicated with the odd gears and the even gears simultaneously.
9. The method of claim 8, the on-load tap changer transitioning from odd gear to even gear, comprising:
the main switch MC1 is opened;
the action arm of the change-over switch Z1 is switched from the electrode a to the electrode b;
closing circulating current vacuum breakers RV1 and RV 2;
disconnecting the load current vacuum circuit breaker MV;
after the electric arc in the load current vacuum circuit breaker MV is completely extinguished, switching an action arm of a change-over switch Z2 from a connection e electrode to a connection f electrode;
closing the load current vacuum circuit breaker MV and simultaneously connecting an odd gear and an even gear;
opening circulating current vacuum circuit breakers RV1 and RV 2;
after the arc in the circulating current vacuum circuit breaker RV1 is completely extinguished, switching an action arm of a change-over switch Z1 from a b electrode to a c electrode;
the main switch MC2 is closed.
10. The method of claim 8, the on-load tap changer transitioning from even gear to odd gear comprising:
the main switch MC2 is opened;
the action arm of the change-over switch Z1 is switched from the c electrode to the d electrode;
closing circulating current vacuum breakers RV1 and RV 2;
disconnecting the load current vacuum circuit breaker MV;
after the electric arc in the load current vacuum circuit breaker MV is completely extinguished, switching an action arm of a change-over switch Z2 from an f electrode to an e electrode;
closing the load current vacuum circuit breaker MV and simultaneously connecting an even gear and an odd gear;
opening circulating current vacuum circuit breakers RV1 and RV 2;
after the arc in the circulating current vacuum circuit breaker RV2 is completely extinguished, switching an action arm of a change-over switch Z1 from a d electrode to an a electrode;
the main switch MC1 is closed.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295536.2A CN112670067B (en) | 2020-11-18 | 2020-11-18 | Symmetrical vacuum bubble load balancing transition circuit device and control method |
| EP20962193.7A EP4250320A1 (en) | 2020-11-18 | 2020-11-30 | Symmetrical vacuum bubble load-balancing transition circuit apparatus, and control method |
| PCT/CN2020/132693 WO2022104902A1 (en) | 2020-11-18 | 2020-11-30 | Symmetrical vacuum bubble load-balancing transition circuit apparatus, and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295536.2A CN112670067B (en) | 2020-11-18 | 2020-11-18 | Symmetrical vacuum bubble load balancing transition circuit device and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112670067A CN112670067A (en) | 2021-04-16 |
| CN112670067B true CN112670067B (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011295536.2A Active CN112670067B (en) | 2020-11-18 | 2020-11-18 | Symmetrical vacuum bubble load balancing transition circuit device and control method |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4250320A1 (en) |
| CN (1) | CN112670067B (en) |
| WO (1) | WO2022104902A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113889329B (en) * | 2021-09-26 | 2023-12-15 | 上海华明电力设备制造有限公司 | On-load tap-changer switching method, circuit and device |
| CN114093594A (en) * | 2021-12-01 | 2022-02-25 | 中国电力科学研究院有限公司 | Transition circuit of on-load tap-changer and control method |
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| DE202010017646U1 (en) * | 2010-05-08 | 2012-04-13 | Maschinenfabrik Reinhausen Gmbh | OLTC |
| DE102010024612B4 (en) * | 2010-06-22 | 2015-06-03 | Maschinenfabrik Reinhausen Gmbh | step switch |
| CN202183304U (en) * | 2011-03-11 | 2012-04-04 | 上海华齐电力设备制造有限公司 | Switching mechanism of vacuum on-load tap changing switch |
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2020
- 2020-11-18 CN CN202011295536.2A patent/CN112670067B/en active Active
- 2020-11-30 EP EP20962193.7A patent/EP4250320A1/en active Pending
- 2020-11-30 WO PCT/CN2020/132693 patent/WO2022104902A1/en unknown
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| JPH08339926A (en) * | 1995-06-12 | 1996-12-24 | Toshiba Corp | On-load tap changer |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2022104902A1 (en) | 2022-05-27 |
| EP4250320A1 (en) | 2023-09-27 |
| CN112670067A (en) | 2021-04-16 |
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