CN112670066B - Transition circuit device and method for alternately bearing symmetrical vacuum bubbles - Google Patents
Transition circuit device and method for alternately bearing symmetrical vacuum bubbles Download PDFInfo
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- CN112670066B CN112670066B CN202011292537.1A CN202011292537A CN112670066B CN 112670066 B CN112670066 B CN 112670066B CN 202011292537 A CN202011292537 A CN 202011292537A CN 112670066 B CN112670066 B CN 112670066B
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Abstract
The invention discloses a transition circuit device alternately loaded by symmetrical vacuum bubbles and a control method, and belongs to the technical field of tap switches. The device of the invention comprises: the circuit breaker comprises a change-over switch Z1, isolating switches Z2 and Z3, load current vacuum circuit breakers V1 and V4, circulating current vacuum circuit breakers V2 and V3 and a transition resistor R. The time sequence of the transition process of the device is mirror symmetry from odd-numbered gear to even-numbered gear and from even-numbered gear to odd-numbered gear, and for the reciprocating motion change-over switch, the operation of 'rail change' of a mechanical transmission mechanism in the reciprocating change-over 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 alternately loaded by symmetric vacuum bubbles and a control method thereof.
Background
An on-load tap changer is a switching device which provides constant voltage for a transformer when the load changes. The basic principle is that switching between taps in a transformer winding is realized under the condition of ensuring that load current is not interrupted, so that the number of turns of the winding, namely the voltage ratio of the transformer, is changed, and the purpose of voltage regulation is finally realized. The vacuum type on-load tap changer mainly realizes arc extinguishing by a vacuum tube of a change-over switch, and electric arcs and hot gas are not exposed; the oil in the oil chamber of the tap changer cannot be carbonized and polluted, and the oil does not need to be purified; burning corrosion of contacts in the vacuum tube can be minimized. The on-load tap-changer mainly comprises a change-over switch, a conversion selector and an electric mechanism.
The on-load tap-changer is required to be provided with a transition circuit and a selection circuit when the on-load tap-changer is switched with a load, and different voltage regulation circuits are required by different voltage regulation modes, so that 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, and the corresponding mechanism is a change-over switch or a selection switch which is the tapping point of the transformation transformer winding under the 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 vacuum circuit breaker, which only bears the task of breaking internal circulating currents. According to the experience of extra-high voltage direct current engineering, the 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 view of the above problems, the present invention provides a transition circuit device alternately loaded by symmetric vacuum bubbles, comprising:
the transfer switch Z1 is provided with four electrodes a, b, c and d and an action arm, the two electrodes a and b are respectively connected with odd gears of an on-load tap-changer selector, the two electrodes c and d are respectively connected with even gears 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;
the system comprises isolation switches Z2 and Z3, wherein the isolation switches Z2 and Z3 are respectively connected with odd gears and even gears of a tapping selector of the on-load tapping switch;
load current vacuum circuit breakers V1 and V4, wherein the V1 is used for cutting off the load current when the odd-numbered gear is switched to the even-numbered gear, and the V4 is used for cutting off the load current when the even-numbered gear is switched to the odd-numbered gear;
the circulating current vacuum circuit breakers V2 and V3, wherein the V2 is used for cutting off circulating current between two gears when an odd gear is switched to an even gear, and the V3 is used for cutting off circulating current between two gears when an even gear is switched to an odd gear;
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, a fixed end of a switch action arm of the transfer switch Z1 is connected to one end of the transition resistor R, and is connected to the transformer neutral point through the transition resistor R.
Optionally, one end of the disconnecting switch Z2 is connected to an odd-numbered stage of the on-load tap-changer tapping selector, and the other end of the disconnecting switch Z2 is connected to one end of the load current vacuum circuit breaker V1 and is connected to the neutral point of the transformer through the V1.
Optionally, one end of the disconnecting switch Z3 is connected to an odd-numbered stage of the on-load tap-changer tapping selector, and the other end is connected to one end of the load current vacuum circuit breaker V4 and is connected to the neutral point of the transformer through V4.
Optionally, two ends of the vacuum circulating circuit breaker V2 are respectively connected to odd-numbered stages of the on-load tap-changer and a and b electrodes of the transfer switch Z1.
Optionally, two ends of the vacuum circulating circuit breaker V3 are respectively connected to even-numbered stages of the on-load tap-changer and c and d electrodes of the transfer switch Z1.
Optionally, two ends of the load current vacuum circuit breaker V1 are respectively connected between the transfer switch Z2 and the neutral point.
Optionally, two ends of the load current vacuum circuit breaker V4 are respectively connected between the transfer switch Z3 and the neutral point.
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 gear of the on-load tap-changer is in an odd gear, the main switch MC1 is closed, and the MC2 is opened;
an action arm of the change-over switch Z1 is conducted with an electrode a, the isolating switch Z2 is closed, and the isolating switch Z3 is disconnected;
load current vacuum circuit breakers V1 and V4 are switched on, circulating current vacuum circuit breakers V2 and V3 are switched off, load current is connected to neutral point output through a main switch MC1, and meanwhile a disconnecting switch Z2 and a load current circuit breaker V1 are connected in parallel to output.
Optionally, 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 electrode c, the isolating switch Z2 is disconnected, and the isolating switch Z3 is closed;
load current vacuum circuit breakers V1 and V4 are switched on, circulating current vacuum circuit breakers V2 and V3 are switched off, load current is connected to neutral point output through a main switch MC2, and meanwhile a disconnecting switch Z3 and a load current circuit breaker V4 are connected in parallel to output.
The invention also provides a control method of the transition circuit device alternatively loaded by using the symmetrical vacuum bubbles, wherein the transition circuit device comprises the following steps: transfer switch Z1, disconnectors Z2 and Z3, load current vacuum interrupters V1 and V4, circulating current vacuum interrupters V2 and V3, main switches MC1 and MC2 and transition resistor R, the method comprising:
two electrodes a and b of the change-over switch Z1 are respectively connected with odd-numbered stages of an on-load tap-changer selector, and two electrodes c and d are respectively connected with even-numbered stages of the on-load tap-changer selector;
connecting the isolating switches Z2 and Z3 with an odd-numbered gear and an even-numbered gear of a tapping selector of the on-load tapping switch respectively;
v1 is used for cutting off the load current when the odd gear is switched to the even gear, and V4 is used for cutting off the load current when the even gear is switched to the odd gear;
v2 is used for cutting off circulation between two gears when an odd gear is switched to an even gear, and V3 is used for cutting off circulation between two gears when an even gear is switched to an odd gear;
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 switched off;
switching the action arm of the change-over switch Z1 from the electrode a to the electrode b;
closing the circulating vacuum breakers V2 and V3;
disconnecting the load current vacuum circuit breakers V1 and V4;
after the electric arc of the load current vacuum circuit breaker V1 is completely extinguished, the disconnecting switch Z2 is disconnected and the disconnecting switch Z3 is closed;
closing the load current vacuum circuit breakers V1 and V4;
the circulating vacuum circuit breakers V2 and V3 are disconnected;
after the arc in the circulating current vacuum circuit breaker V2 is completely extinguished, connecting an action arm of a change-over switch Z1 with a b electrode and switching the action arm 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 switched off;
switching the c electrode connected with the action arm of the change-over switch Z1 to the d electrode;
closing the circulating vacuum breakers V2 and V3;
disconnecting the load current vacuum circuit breakers V1 and V4;
after the electric arc in the load current vacuum circuit breaker V4 is completely extinguished, the disconnecting switch Z2 is closed, and the disconnecting switch Z3 is disconnected;
closing the load current vacuum circuit breakers V1 and V4;
the circulating vacuum circuit breakers V2 and V3 are disconnected;
after the arc in the circulating current vacuum circuit breaker V3 is completely extinguished, switching the electrode d connected with the action arm of the change-over switch Z1 to the electrode a;
the main switch MC1 is closed.
The time sequence of the transition process of the device is mirror symmetry from odd-numbered gear to even-numbered gear and from even-numbered gear to odd-numbered gear, and for the reciprocating motion change switch, the 'rail change' operation 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 tasks of passing and cutting off the load current are alternately borne by the two load current vacuum circuit breakers V1 and V4, and the tasks of passing and cutting off the circulating current are alternately borne by the two circulating current vacuum circuit breakers V2 and V3, so that the switching task of two vacuum bubbles in the existing topology is shared, the vacuum bubble replacement period of the vacuum switch is increased by about one time, and the electrical service life of the whole switch is greatly prolonged.
Drawings
FIG. 1 is a diagram of a transition circuit device alternately loaded by symmetrical vacuum bubbles according to the present invention;
fig. 2 is a schematic diagram of a transition circuit of an on-load tap changer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a transition circuit of an on-load tap changer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a transition circuit of an on-load tap changer according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a transition circuit of an on-load tap changer according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a transition circuit of an on-load tap changer according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a transition circuit of an on-load tap-changer according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a transition circuit switching of an on-load tap changer according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a transition circuit switching of an on-load tap changer according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a transition circuit of an on-load tap changer according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 13 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 15 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 16 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 17 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 18 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 19 is a schematic diagram of a transition circuit transition of an on-load tap changer according to an embodiment of the present invention;
fig. 20 is a schematic diagram of a transition circuit transition 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 the on-load tap-changer of the invention with 2 transition resistors R;
FIG. 24 is a flowchart illustrating a control method for a transition circuit device alternately loaded with symmetrical vacuum bubbles 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 units/elements are denoted by the same reference numerals.
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. In addition, 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 context in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a transition circuit device alternately loaded by symmetrical vacuum bubbles, as shown in figure 1, comprising:
the transfer switch Z1 is provided with four electrodes a, b, c and d and an action arm, the two electrodes a and b are respectively connected with odd gears of an on-load tap-changer selector, the two electrodes c and d are respectively connected with even gears 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;
the isolating switches Z2 and Z3 are respectively connected with the odd gears and the even gears of the on-load tap-changer tapping selector;
load current vacuum circuit breakers V1 and V4, wherein the V1 is used for cutting off the load current when the odd-numbered gear is switched to the even-numbered gear, and the V4 is used for cutting off the load current when the even-numbered gear is switched to the odd-numbered gear;
the circulating current vacuum circuit breakers V2 and V3, wherein the V2 is used for cutting off circulating current between two gears when an odd gear is switched to an even gear, and the V3 is used for cutting off circulating current between two gears when an even gear is switched to an odd gear;
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.
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.
One end of the isolating switch Z2 is connected with an odd-numbered gear of a tapping selector of the on-load tapping switch, and the other end of the isolating switch Z2 is connected with one end of a load current vacuum circuit breaker V1 and is connected with a neutral point of the transformer through the V1.
One end of the isolating switch Z3 is connected with an odd-numbered gear of a tapping selector of the on-load tapping switch, and the other end of the isolating switch Z is connected with one end of a load current vacuum circuit breaker V4 and is connected with a neutral point of the transformer through the V4.
Two ends of the circulating current vacuum circuit breaker V2 are respectively connected with odd gears of the on-load tap-changer and electrodes a and b of the change-over switch Z1.
And two ends of the circulating current vacuum circuit breaker V3 are respectively connected with an even-numbered stage of a tapping selector of the on-load tapping switch and c and d electrodes of the change-over switch Z1.
Two ends of the load current vacuum circuit breaker V1 are respectively connected between the change-over switch Z2 and the neutral point.
The two ends of the load current vacuum circuit breaker V4 are respectively connected between the change-over switch Z3 and the neutral point.
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;
an action arm of the change-over switch Z1 is conducted with an electrode a, the isolating switch Z2 is closed, and the isolating switch Z3 is disconnected;
load current vacuum circuit breakers V1 and V4 are conducted, circulating current vacuum circuit breakers V2 and V3 are disconnected, load current is connected to neutral point output through a main switch MC1, meanwhile, a disconnecting switch Z2 is connected in parallel, and the load current circuit breaker V1 outputs.
When the gears of the on-load tap-changer are 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 electrode c, the isolating switch Z2 is disconnected, and the isolating switch Z3 is closed;
load current vacuum circuit breakers V1 and V4 are switched on, circulating current vacuum circuit breakers V2 and V3 are switched off, load current is connected to neutral point output through a main switch MC2, and meanwhile a disconnecting switch Z3 and a load current circuit breaker V4 are connected in parallel to output.
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, switches Z2 and Z3, load current vacuum circuit breakers V1 and V4, circulating current vacuum circuit breakers V2 and V3 and a transition resistor R, wherein main switches MC1 and MC2 are respectively arranged in odd-numbered gear and even-numbered gear main loops of the switches.
The transfer switch Z1 has four electrodes a, b, c and d in total, the electrodes a and b are respectively connected with odd-numbered stages of a tapping selector of the on-load tapping switch, the electrodes c and d are respectively connected with even-numbered stages of the tapping selector of the on-load tapping switch, the fixed end of the action arm of the transfer switch Z1 is connected with a transition resistor, and a moving contact can be rotationally and selectively connected with the four electrodes a, b, c and d;
one end of each of the isolating switches Z2 and Z3 is connected with an odd-numbered gear and an even-numbered gear of a tapping selector of the on-load tapping switch respectively, and the other end of each of the isolating switches Z2 and Z3 is connected with a neutral point of the transformer through a load current vacuum circuit breaker V1 and a load current vacuum circuit breaker V4 respectively;
the circulating current vacuum circuit breaker V2 is used for cutting off circulating current between two gears when an odd gear is switched to an even gear, and the circulating current vacuum circuit breaker V3 is used for cutting off circulating current between two gears when an even gear is switched to an odd gear;
the load current vacuum circuit breaker V1 is for cutting off the load current when the odd-numbered stage is switched to the even-numbered stage, and V4 is for cutting off the load current when the even-numbered stage is switched to the odd-numbered stage.
The main switches MC1 and MC2 are used for switching the normal through-current before and after completion.
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 gear of the on-load tap-changer is in odd tap, 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 electrode a, the switch Z2 is closed, the switch Z3 is opened, the load current vacuum circuit breakers V1 and V4 are conducted, the circulating current vacuum circuit breakers V2 and V3 are opened, and the load current I is N The output of the neutral point is connected through the main switch MC1, and the output of the parallel switch Z2 and the load current breaker V1 is connected at the same time.
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 loadCurrent I N Output through the switch Z2 and the load current breaker V1;
as shown in fig. 3, the movable contact of the actuating arm of the change-over switch Z1 is switched from a to b electrode, at this time, the Z1 switch is not electrified, and the Z1 switch is still connected to the odd-numbered stage of the switch;
as shown in fig. 4, the vacuum circuit breakers V2 and V3 are closed simultaneously, and the load current I of odd-numbered stages N The current flows through the switch Z2 and the output of the load current breaker V1, is connected with the transition resistor R and the circulating current breaker V2 in parallel, and is output through the contact of the change-over switch Z1 b;
as shown in FIG. 5, the load current vacuum circuit breakers V1 and V4 are opened to cut off the load current I N V1 generates electric arc, and after the electric arc is extinguished, the odd-numbered load current I N Sequentially flows through a transition resistor R, a circulation vacuum circuit breaker V2 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 V1 V1 ＝I N ×R；
As shown in FIG. 6, after the arc in the load current vacuum circuit breaker V1 is completely extinguished, the switch Z2 is opened, the switch Z3 is closed, and the load current I of odd-numbered stage N Sequentially flows through a transition resistor R, a circulation vacuum circuit breaker V2 and a change-over switch Z1 b contact for output;
as shown in fig. 7, when the load current vacuum circuit breakers V1 and V4 are 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 the moment, the load current is transferred from the odd gear to the even gear, and the even gear load current I N Current I flowing through the switch Z3 and the load current vacuum circuit breaker V4 output V4 ＝I N +I C Wherein said US is an on-load tap changer stage voltage;
as shown in FIG. 8, the circulating vacuum breakers V2, V3 are opened simultaneously, wherein V2 pulls the circulating current I apart C1 Generating an electric arc, wherein V3 is an uncharged flow; even-numbered stage load current I N Through the output of the switch Z3 and the load current vacuum circuit breaker V4, the recovery of the two ends of the circulation vacuum circuit breaker V2At a voltage of U V2 ＝U S ；
As shown in fig. 9, after the arc in the vacuum circuit breaker V2 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 I N Flowing through the switch Z3 and the load current vacuum circuit breaker V4;
as shown in FIG. 10, the main switch MC2 is closed and the even-numbered stage load current I N Flows through the output of the main switch MC2 and is simultaneously output by the parallel switch Z3 and the load current breaker V4. When the tapping conversion operation is finished, the change-over switch completes the voltage regulation of converting from the odd gear to the even gear;
when the gear of the on-load tap-changer is in even tap, 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 switch Z2 is opened, and the switch Z3 is closed; the load current vacuum circuit breakers V1 and V4 are switched on, the circulating current vacuum circuit breakers V2 and V3 are switched off, and the load current I N The output of the neutral point is connected through a main switch MC2, and the output of a parallel switch Z3 and a load current breaker V4 is connected at the same time;
the tap changer is switched from even gear to odd gear, and 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 I N The current flows through a switch Z3 and is output by a load current breaker V4;
as shown in fig. 13, the moving contact of the actuating arm of the change-over switch Z1 is changed from c to d, at this time, the Z1 switch is not electrified, and the Z1 switch is still connected to the even-numbered stage of the switch;
as shown in FIG. 14, the vacuum circuit breakers V2 and V3 are closed at the same time, and the load current I of the odd-numbered stages N The current flows through a switch Z3 and is output by a load current breaker V4, and is simultaneously connected with a transition resistor R and a circulating current breaker V3 in parallel and output by a contact of a change-over switch Z1 d;
as shown IN fig. 15, the load current vacuum interrupters V1 and V4 are opened to interrupt the load current IN, and an arc is generated at V4; after the arc is extinguished, the load current I of odd number gear N Sequentially flows through a transition resistor R, a circulation vacuum circuit breaker V3 and a change-over switch Z1 d contact for output, and the load vacuum circuit breaker V4 is divided into twoRecovery voltage of terminal U V4 ＝I N ×R；
As shown in fig. 16, when the arc in the load current vacuum circuit breaker V4 is completely extinguished, the switch Z2 is closed, the switch Z3 is opened, and the even-numbered stage load current I N Sequentially flows through a transition resistor R, a circulation vacuum circuit breaker V3 and a change-over switch Z1 d contact for output;
as shown in fig. 17, when the load current vacuum circuit breakers V1 and V4 are 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 gear N Current I flowing through the switch Z2 and the load current vacuum circuit breaker V1 output, current I flowing through the load current vacuum circuit breaker V1 V1 ＝I N +I C (ii) a Wherein, the U S Is an on-load tap-changer level voltage;
as shown in fig. 18, the circulating vacuum breakers V2, V3 are opened simultaneously, wherein V3 pulls the circulating current I apart C Generating an electric arc, wherein V2 is an uncharged flow; even-numbered stage load current I N Flowing through the switch Z2 and the load current vacuum circuit breaker V1; the recovery voltage at two ends of the circulating current vacuum circuit breaker V3 is U V3 ＝U S ；
As shown in FIG. 19, after the arc in the vacuum circuit breaker V3 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 load current I N The load current flowing through switch Z2 is the vacuum interrupter V1 output.
As shown in FIG. 20, the main switch MC1 is closed and the odd-numbered stage load current I N Flows through the output of the main switch MC1 and is simultaneously connected with the output of the switch Z2 and the load current breaker V1 in parallel. 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, I N Is the load current; us is an on-load tap-changer level voltage; and R is transition resistance.
Fig. 23 shows a variant embodiment of the load changeover switch according to the invention of an on-load tap changer, in which the transition resistor R according to the invention is not arranged as a branch, but instead is formed as two branches R1 and R2; the position of the transition resistor R is not arranged between the fixed end of the actuating arm of the change-over switch Z1 and the neutral point, but is respectively arranged between the circulating current vacuum circuit breakers V2 and V3 and odd-numbered and even-numbered taps. The transformer oil decomposition gas production and insulation performance reduction device has the advantages that the load current and the circulation current of the odd-numbered gear switched to the even-numbered gear and the load current of the even-numbered gear switched to the odd-numbered gear are alternately born by the two transition resistors R1 and R2, the two transition resistors alternately work and radiate heat, the temperature of the transition resistors can be reduced, the phenomenon that the decomposition gas production and insulation performance of the transformer oil are reduced due to overhigh temperature of the transition resistors is avoided, and the electrical service life of the whole switch is greatly prolonged.
The invention also provides a control method of the transition circuit device alternatively loaded by using the symmetrical vacuum bubbles, wherein the transition circuit device comprises the following steps: the changeover switch Z1, the disconnecting switches Z2 and Z3, the load current vacuum circuit breakers V1 and V4, the circulating current vacuum circuit breakers V2 and V3, the main switches MC1 and MC2, and the transition resistor R, as shown in fig. 24, include:
two electrodes a and b of the transfer switch Z1 are respectively connected with odd gears of an on-load tap-changer selector, and two electrodes c and d are respectively connected with even gears of the on-load tap-changer selector;
connecting the isolating switches Z2 and Z3 with an odd-numbered gear and an even-numbered gear of a tapping selector of the on-load tapping switch respectively;
v1 is used for cutting off the load current when the odd gear is switched to the even gear, and V4 is used for cutting off the load current when the even gear is switched to the odd gear;
v2 is used for cutting off circulation between two gears when an odd gear is switched to an even gear, and V3 is used for cutting off circulation between two gears when an even gear is switched to an odd gear;
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.
The on-load tap-changer is converted from an odd gear to an even gear and comprises the following steps:
the main switch MC1 is switched off;
switching the action arm of the change-over switch Z1 from the electrode a to the electrode b;
closing the circulating vacuum breakers V2 and V3;
disconnecting the load current vacuum circuit breakers V1 and V4;
after the electric arc of the load current vacuum circuit breaker V1 is completely extinguished, the disconnecting switch Z2 is disconnected and the disconnecting switch Z3 is closed;
closing the load current vacuum circuit breakers V1 and V4;
the circulating vacuum circuit breakers V2 and V3 are disconnected;
after the arc in the circulating current vacuum circuit breaker V2 is completely extinguished, connecting an action arm of a change-over switch Z1 with a b electrode and switching the action arm to a c electrode;
the main switch MC2 is closed.
The on-load tap-changer is converted from an even gear to an odd gear and comprises the following steps:
the main switch MC2 is switched off;
switching the c electrode connected with the action arm of the change-over switch Z1 to the d electrode;
closing the circulating vacuum breakers V2 and V3;
disconnecting the load current vacuum circuit breakers V1 and V4;
after the electric arc in the load current vacuum circuit breaker V4 is completely extinguished, the disconnecting switch Z2 is closed, and the disconnecting switch Z3 is disconnected;
closing the load current vacuum circuit breakers V1 and V4;
the circulating vacuum circuit breakers V2 and V3 are disconnected;
after the arc in the circulating current vacuum circuit breaker V3 is completely extinguished, switching the electrode d connected with the action arm of the change-over switch Z1 to the electrode a;
the main switch MC1 is closed.
The time sequence of the transition process of the device is mirror symmetry from odd-numbered gear to even-numbered gear and from even-numbered gear to odd-numbered gear, and for the reciprocating motion change switch, the 'rail change' operation 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 tasks of passing and cutting off the load current are alternately borne by the two load current vacuum circuit breakers V1 and V4, and the tasks of passing and cutting off the circulation current are alternately borne by the two circulation current vacuum circuit breakers V2 and V3, so that the switching task of two vacuum bubbles in the existing topology is shared, the vacuum bubble replacement period of the vacuum switch is increased by about one time, 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 (14)
1. A symmetrical vacuum bubble alternating load transition circuit arrangement, the arrangement comprising:
the transfer switch Z1 is provided with four electrodes a, b, c and d and an action arm, the two electrodes a and b are respectively connected with odd gears of an on-load tap-changer selector, the two electrodes c and d are respectively connected with even gears 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;
the isolating switches Z2 and Z3 are respectively connected with the odd gears and the even gears of the on-load tap-changer tapping selector;
load current vacuum circuit breakers V1 and V4, the V1 for cutting off the load current when the odd-numbered stage is switched to the even-numbered stage, the V4 for cutting off the load current when the even-numbered stage is switched to the odd-numbered stage;
the circulating current vacuum circuit breakers V2 and V3, wherein the V2 is used for cutting off circulating current between two gears when an odd gear is switched to an even gear, and the V3 is used for cutting off circulating current between two gears when an even gear is switched to an odd gear;
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, 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.
3. The device of claim 1, wherein the isolating switch Z2 is connected with an odd-numbered gear of a tapping selector of the on-load tapping switch at one end, and is connected with one end of a load current vacuum circuit breaker V1 at the other end, and is connected with a neutral point of the transformer through the V1.
4. The device of claim 1, wherein the isolating switch Z3 is connected with an odd-numbered gear of a tap changer tap selector of an on-load tap changer at one end, and is connected with one end of a load current vacuum circuit breaker V4 at the other end, and is connected with a neutral point of a transformer through the V4.
5. The apparatus of claim 1, wherein the ac vacuum circuit breaker V2 is connected to the odd-numbered stage of the on-load tap changer tap selector and the a and b poles of the transfer switch Z1.
6. The apparatus as claimed in claim 1, wherein the vacuum circuit breaker V3 is connected with the even-numbered stages of the on-load tap changer tap selector and the c and d electrodes of the transfer switch Z1 at two ends.
7. The device according to claim 1, wherein the load current vacuum circuit breaker V1 is connected between the transfer switch Z2 and the neutral point at both ends.
8. The apparatus of claim 1, wherein the load current vacuum interrupter V4 is connected across the transfer switch Z3 and the neutral point.
9. The arrangement of claim 1, main switches MC1 and MC2 are connected between the on-load tap changer tap selector odd and even gears, respectively, and the transformer neutral.
10. The device of claim 9, 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;
an action arm of the change-over switch Z1 is conducted with an electrode a, the isolating switch Z2 is closed, and the isolating switch Z3 is disconnected;
load current vacuum circuit breakers V1 and V4 are conducted, circulating current vacuum circuit breakers V2 and V3 are disconnected, load current is connected to neutral point output through a main switch MC1, meanwhile, a disconnecting switch Z2 is connected in parallel, and the load current vacuum circuit breaker V1 outputs.
11. The device of claim 9, wherein when the gear position of the on-load tap changer is in even-numbered 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 electrode c, the isolating switch Z2 is disconnected, and the isolating switch Z3 is closed;
load current vacuum circuit breakers V1 and V4 are conducted, circulating current vacuum circuit breakers V2 and V3 are disconnected, load current is connected to neutral point output through a main switch MC2, and meanwhile a conversion isolating switch Z3 is connected in parallel, and load current vacuum circuit breaker V4 outputs.
12. A control method for a transition circuit arrangement alternately carried using symmetrical vacuum bubbles, the transition circuit arrangement comprising: transfer switch Z1, disconnectors Z2 and Z3, load current vacuum interrupters V1 and V4, circulating current vacuum interrupters V2 and V3, main switches MC1 and MC2 and transition resistor R, the method comprising:
two electrodes a and b of the change-over switch Z1 are respectively connected with odd-numbered stages of an on-load tap-changer selector, and two electrodes c and d are respectively connected with even-numbered stages of the on-load tap-changer selector;
connecting the isolating switches Z2 and Z3 with an odd-numbered gear and an even-numbered gear of a tapping selector of the on-load tapping switch respectively;
v1 is used for cutting off the load current when the odd gear is switched to the even gear, and V4 is used for cutting off the load current when the even gear is switched to the odd gear;
v2 is used for cutting off circulation between two gears when an odd gear is switched to an even gear, and V3 is used for cutting off circulation between two gears when an even gear is switched to an odd gear;
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.
13. The method of claim 12, the on-load tap changer transitioning from odd gear to even gear, comprising:
the main switch MC1 is switched off;
switching the action arm of the change-over switch Z1 from the electrode a to the electrode b;
closing the circulating vacuum breakers V2 and V3;
disconnecting the load current vacuum circuit breakers V1 and V4;
after the electric arc of the load current vacuum circuit breaker V1 is completely extinguished, the disconnecting switch Z2 is disconnected and the disconnecting switch Z3 is closed;
closing the load current vacuum circuit breakers V1 and V4;
the circulating vacuum circuit breakers V2 and V3 are disconnected;
after the arc in the circulating current vacuum circuit breaker V2 is completely extinguished, connecting an action arm of a change-over switch Z1 with a b electrode and switching the action arm to a c electrode;
the main switch MC2 is closed.
14. The method of claim 12, the on-load tap changer transitioning from even gear to odd gear comprising:
the main switch MC2 is switched off;
switching the c electrode connected with the action arm of the change-over switch Z1 to the d electrode;
closing the circulating vacuum breakers V2 and V3;
disconnecting the load current vacuum circuit breakers V1 and V4;
after the electric arc in the load current vacuum circuit breaker V4 is completely extinguished, the disconnecting switch Z2 is closed, and the disconnecting switch Z3 is disconnected;
closing the load current vacuum circuit breakers V1 and V4;
the circulating vacuum circuit breakers V2 and V3 are disconnected;
after the electric arc in the circulating vacuum circuit breaker V3 is completely extinguished, switching a d electrode connected with an action arm of a change-over switch Z1 to an a electrode;
the main switch MC1 is closed.
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| CN202011292537.1A CN112670066B (en) | 2020-11-18 | 2020-11-18 | Transition circuit device and method for alternately bearing symmetrical vacuum bubbles |
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| CN202011292537.1A CN112670066B (en) | 2020-11-18 | 2020-11-18 | Transition circuit device and method for alternately bearing symmetrical vacuum bubbles |
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