CN217485303U - Vacuum on-load tap-changer single-resistor transition circuit - Google Patents
Vacuum on-load tap-changer single-resistor transition circuit Download PDFInfo
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- CN217485303U CN217485303U CN202123059029.1U CN202123059029U CN217485303U CN 217485303 U CN217485303 U CN 217485303U CN 202123059029 U CN202123059029 U CN 202123059029U CN 217485303 U CN217485303 U CN 217485303U
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Abstract
The utility model discloses a vacuum has tap-changer single resistance transition circuit who carries belongs to the transformer and has the tap-changer technical field that carries. The utility model discloses the circuit includes: main switches MC1 and MC2, transition switches Z1 and Z2, transition resistor R, main vacuum tubes V1 and V2, and auxiliary vacuum tubes V3 and V4. In the utility model provides an among the transition circuit, main vacuum tube V1 and V2 keep apart transition switch Z1 and shunting side, supplementary vacuum tube V3 and V4 keep apart transition switch Z2 and shunting side, even the vacuum tube can't reliably put off the arc and lead to transition switch Z1 or Z2 electrified current to draw the arc, because the existence of opposite side vacuum tube fracture, can not draw the arc and cause the interstage short circuit because of transition switch electrified current yet, greatly reduce shunting switch electrical fault probability, reduce the fault loss; load current is cut off by the main vacuum tubes V1 and V2 in turn, circulation is switched by the auxiliary vacuum tubes V3 and V4 in turn, switching tasks of each vacuum tube are low, and switching reliability of the vacuum tubes is improved remarkably.
Description
Technical Field
The utility model relates to a transformer technical field to more specifically relates to a vacuum has tap-changer single resistance transition circuit who carries.
Background
An on-load tap changer is a device which enables a transformer to output constant voltage when the load changes, and generally works in transformer oil. A large amount of electric arcs can be generated in oil in the process of on-load voltage regulation of a traditional on-load tap-changer, so that not only can contacts be ablated, but also transformer oil can be polluted. The vacuum type on-load tap-changer mainly realizes the arc extinguishing by the vacuum tube of the change-over switch, the electric arc can not pollute the oil in the oil chamber of the tap-changer, and the operation and maintenance and the cost can be greatly reduced. The vacuum on-load tap changer needs a transition circuit for switching with load, the transition circuit is a series resistance circuit bridged between tapping points and is used for changing the tapping point of a transformer winding under the charged state, and the tap changer adopts the principle of the transition circuit to realize tap changing operation.
The vacuum on-load tap-changer is an electromechanical integrated device for mechanically driving an electrical contact to act, and simultaneously bears mechanical load and electrical load in the switching process. The existing vacuum on-load tap-changer is difficult to simultaneously achieve the aims of simple mechanical mechanism and light electrical task, and two technical routes exist, wherein one is to design a contact time sequence with central symmetry, so that the direct reciprocating action of the mechanism can be realized by one set of cam profile, but the electrical task is heavier; one is designed from an electrical task, the advantage of low electrical task of a main vacuum tube and an auxiliary vacuum tube is realized, but the contact time sequence cannot realize central symmetry, two sets of cam profiles are required for reciprocating switching, the two sets of cam profiles are required to be converted by mechanical lifting, and the mechanical structure is complex. In addition, the transition circuit of the existing vacuum on-load tap changer has low fault tolerance, once the vacuum tube cannot be reliably extinguished, the mechanical switch connected with the vacuum tube in series is easy to generate current arcing to cause the inter-stage short circuit of the tap changer, and serious electrical faults are caused.
Disclosure of Invention
To the above problem, the utility model relates to a vacuum has tap changer single resistance transition circuit who carries, include:
main switches MC1 and MC2, transition switches Z1 and Z2, transition resistor R, main vacuum tubes V1 and V2, and auxiliary vacuum tubes V3 and V4;
one end of the main switch MC1 is connected with the odd-numbered tapping side of the on-load tapping switch, and the other end of the main switch MC1 is connected with the neutral point of the transformer;
one end of the main switch MC2 is connected with an even-numbered tapping side of the on-load tapping switch, and the other end of the main switch MC2 is connected with a neutral point of the transformer;
the transition switch Z1 includes: the device comprises a fixed contact 11, a fixed contact 12 and an action arm, wherein the rotating end of the action arm is connected with any one of the fixed contact 11 and the fixed contact 12, and the fixed end of the action arm is connected with a neutral point of a transformer;
the transition switch Z2 comprises: the device comprises a fixed contact 21, a fixed contact 22 and an action arm, wherein the rotating end of the action arm is connected with any one of the fixed contact 21 and the fixed contact 22, and the fixed end of the action arm is connected with a transition resistor R;
two ends of the transition resistor R are respectively connected with the fixed end of the action arm of the transition switch Z2 and the neutral point of the transformer;
two ends of the main vacuum tube V1 are respectively connected with the odd tapping side and the static contact 11;
two ends of the main vacuum tube V2 are respectively connected with the static contact 12 and the even tapping sides;
two ends of the auxiliary vacuum tube V3 are respectively connected with the odd tapping side and the static contact 21;
two ends of the auxiliary vacuum tube V4 are respectively connected with the static contact 22 and the even tapping side.
Optionally, when the shift of the on-load tap changer is in an odd shift, the main switch MC1 is in a conducting state, the main switch MC2 is in a disconnecting state, the action arm of the transition switch Z1 is connected to the fixed contact 11, the action arm of the transition switch Z2 is connected to the fixed contact 21, the main vacuum tube V1 is in a conducting state, the main vacuum tube V2 is in a disconnecting state, and the auxiliary vacuum tubes V3 and V4 are in a disconnecting state;
the load current is connected to the transformer neutral output through the main switch MC 1.
Optionally, when the shift position of the on-load tap changer is in an even-numbered stage, the main switch MC1 is in an off state, the main switch MC2 is in an on state, the action arm of the transition switch Z1 is connected to the fixed contact 12, the action arm of the transition switch Z2 is connected to the fixed contact 22, the main vacuum tube V1 is in an off state, the main vacuum tube V2 is in an on state, and the auxiliary vacuum tubes V3 and V4 are in an off state;
the load current is connected to the transformer neutral output through the main switch MC 2.
Optionally, the actuation timings of the main switch MC1 and the main switch MC2, the transition switch Z1, the main vacuum tube V1 and the main vacuum tube V2, and the auxiliary vacuum tube V3 and the auxiliary vacuum tube V4 are all symmetric timings, and are all implemented by using a single cam profile.
Optionally, the actuation timing of the transition switch Z2 is quasi-symmetric timing.
Optionally, when the odd gear is switched to the even gear, the main vacuum tube V1 cuts off the load current, and the auxiliary vacuum tube V3 cuts off the circulation current; when the even gear is switched to the odd gear, the main vacuum tube V2 cuts off load current, the auxiliary vacuum tube V4 cuts off circulation, the main vacuum tube V1 and the main vacuum tube V2 cut off the load current in turn, and the auxiliary vacuum tube V3 and the auxiliary vacuum tube V4 cut off circulation in turn.
Optionally, main vacuum tube V1 and main vacuum tube V2 isolate transition switch Z1 from the tap side, and main vacuum tube V1 is disconnected from main vacuum tube V2 when transition switch Z1 switches.
Optionally, the auxiliary vacuum tube V3 and the auxiliary vacuum tube V4 isolate the transition switch Z2 from the tap side, and when the transition switch Z2 switches, the main vacuum tubes V3 and V4 are in an off state.
The utility model has the advantages that:
1. when the odd gear is switched to the even gear, the main vacuum tube V1 cuts off the load current, and the auxiliary vacuum tube V3 cuts off the circulation current; when the even gear is switched to the odd gear, the main vacuum tube V2 cuts off the load current, and the auxiliary vacuum tube V4 cuts off the circulation current. The main vacuum tube V1 and the auxiliary vacuum tube V4 cut off the load current in turn and the auxiliary vacuum tubes V3 and V2 cut off the circulation in turn, so that the arc ablation condition of the vacuum tubes is reduced, and the operation reliability of the vacuum tubes is remarkably improved.
2. The main vacuum tubes V1 and V2 isolate the transition switch Z1 from the tapping side, and when the transition switch Z1 operates, the main vacuum tubes V1 and V2 are in a disconnected state, so that the static contact 11 or the static contact 12 with a suspended potential can be prevented from discharging; even if the main vacuum tube V1 or V2 is not reliably quenched, the transition contact Z1 may be pulled out with current, and due to the fact that a fracture exists in the corresponding main vacuum tube V2 or V1, the inter-stage short circuit probability caused by the fact that Z1 is pulled out with current can be effectively reduced, and the fault probability caused by the fact that the vacuum tube is not reliably quenched is greatly reduced.
3. The auxiliary vacuum tubes V3 and V4 isolate the transition switch Z2 from the tapping side, and when the transition switch Z2 operates, the transition vacuum tubes V3 and V4 are in a disconnected state, so that the static contact 21 or the static contact 22 with a suspended potential can be prevented from discharging; even if the V3 or V4 auxiliary vacuum tube is not reliably quenched, the transition contact Z2 may be pulled out with current, and due to the fact that a fracture exists in the corresponding auxiliary vacuum tube V4 or V3, the inter-stage short circuit probability caused by the fact that Z2 is pulled out with current can be effectively reduced, and the fault probability caused by the fact that the vacuum tube is not reliably quenched is greatly reduced.
4. Except that the time sequence of the transition switch Z2 is a quasi-symmetrical time sequence, other devices are completely symmetrical time sequences, the design of reciprocating switching cams can be directly implemented, and only one layer of cam track and profile line is used. For the quasi-symmetrical time sequence of the transition switch Z2, the reciprocating direct switching of the quasi-symmetrical time sequence can be directly realized through the matching of double cams; the utility model discloses a topological structure and chronogenesis can reciprocal direct switch over, have reduced the mechanical complexity who has on-load tap-changer, have improved reliability and mechanical life.
Drawings
Fig. 1 is a structural diagram of a transition circuit when a vacuum on-load tap changer according to an embodiment of the present invention is in an odd-numbered gear;
fig. 2(a) to 2(h) are intermediate process conversion diagrams when the transition circuit of the vacuum on-load tap changer provided by the embodiment of the present invention is switched from odd-numbered gear to even-numbered gear;
fig. 3 is a schematic diagram of a transition circuit of the vacuum on-load tap changer according to the embodiment of the present invention in an even-numbered gear;
fig. 4(a) to 4(h) are transition diagrams of the vacuum on-load tap changer according to the embodiment of the present invention during the transition from the even-numbered stage to the odd-numbered stage;
fig. 5 is a schematic diagram of an action timing sequence of switching a transition circuit of an on-load tap changer from an odd-numbered gear to an even-numbered gear according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an action timing sequence of switching a transition circuit of an on-load tap changer from an even gear to an odd gear according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, which, however, may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of thoroughly and completely disclosing the present invention and fully conveying the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments presented 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. 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 utility model relates to a vacuum has tap changer single resistance transition circuit who carries, as shown in fig. 1, include:
main switches MC1 and MC2, transition switches Z1 and Z2, transition resistor R, main vacuum tubes V1 and V2, and auxiliary vacuum tubes V3 and V4;
one end of the main switch MC1 is connected with the odd-numbered tapping side of the on-load tapping switch, and the other end of the main switch MC1 is connected with the neutral point of the transformer;
one end of the main switch MC2 is connected with an even-numbered tapping side of the on-load tapping switch, and the other end of the main switch MC2 is connected with a neutral point of the transformer;
the transition switch Z1 includes: the device comprises a static contact 11, a static contact 12 and an action arm, wherein the rotating end of the action arm is connected with any one of the static contact 11 and the static contact 12, and the fixed end of the action arm is connected with a neutral point of a transformer;
the transition switch Z2 includes: the device comprises a fixed contact 21, a fixed contact 22 and an action arm, wherein the rotating end of the action arm is connected with any one of the fixed contact 21 and the fixed contact 22, and the fixed end of the action arm is connected with a transition resistor R;
two ends of the transition resistor R are respectively connected with the fixed end of the action arm of the transition switch Z2 and the neutral point of the transformer;
two ends of the main vacuum tube V1 are respectively connected with the odd tapping side and the static contact 11;
two ends of the main vacuum tube V2 are respectively connected with the static contact 12 and the even tapping side;
two ends of the auxiliary vacuum tube V3 are respectively connected with the odd tapping side and the static contact 21;
two ends of the auxiliary vacuum tube V4 are respectively connected with the static contact 22 and the even tapping side.
When the gear of the on-load tap-changer is in an odd gear, the main switch MC1 is in a conducting state, the main switch MC2 is in a disconnecting state, the action arm of the transition switch Z1 is connected with the fixed contact 11, the action arm of the transition switch Z2 is connected with the fixed contact 21, the main vacuum tube V1 is in a conducting state, the main vacuum tube V2 is in a disconnecting state, and the auxiliary vacuum tubes V3 and V4 are in a disconnecting state;
the load current is connected to the transformer neutral output through the main switch MC 1.
When the gear of the on-load tap-changer is in an even gear, the main switch MC1 is in an off state, the main switch MC2 is in an on state, the action arm of the transition switch Z1 is connected with the fixed contact 12, the action arm of the transition switch Z2 is connected with the fixed contact 22, the main vacuum tube V1 is in an off state, the main vacuum tube V2 is in an on state, and the auxiliary vacuum tubes V3 and V4 are in an off state;
the load current is connected to the transformer neutral output through the main switch MC 2.
The action time sequences of the main switch MC1 and the main switch MC2, the transition switch Z1, the main vacuum tube V1 and the main vacuum tube V2, and the auxiliary vacuum tube V3 and the auxiliary vacuum tube V4 are symmetrical time sequences, and are all realized by adopting a single cam profile.
The operation timing of the transition switch Z2 is quasi-symmetric timing.
The invention will be further described with reference to the following examples:
in the embodiment of the present invention, when the on-load tap-changer is in the odd tap-off side, as shown in fig. 1, the load current I of the odd-numbered gear is N Through the output of the main switch MC 1.
The on-load tap-changer is converted from an odd gear to an even gear and comprises the following steps:
(1) as shown in fig. 1 and 2(a), the main switch MC1 is turned off and the odd-numbered load current I N Flows through the main vacuum tube V1 and the output of the transition switch Z1;
(2) as shown in FIG. 1 and FIG. 2(b), the auxiliary vacuum tubes V3 and V4 are conducted simultaneously, and the odd-numbered stage load current I N Flows through the main vacuum tube V1 and the transition switch Z1 for output;
(3) as shown in FIGS. 1 and 2(c), the main vacuum tube V1 is cut off to cut off the load current I N When an arc is generated and extinguished, the load current I of odd-numbered gears N Flows through the auxiliary vacuum tube V3, the transition switch Z2 and the transition resistor R output;
(4) as shown in fig. 1 and 2(d), after the arc in the main vacuum tube V1 is extinguished, the moving arm of the switching transition switch Z1 is connected from the fixed contact 11 to the fixed contact 12, and the odd-numbered stage load current I N Flows through the auxiliary vacuum tube V3, the transition switch Z2 and the transition resistor R output;
(5) as shown in FIG. 1 and FIG. 2(e), when the main vacuum tube V2 is turned on, the transition circuit is connected to the odd-numbered stage and the even-numbered stage simultaneously to form a bridge connection, and a circulating current I is generated C ＝U S The load current is transferred from the odd-numbered stage to the even-numbered stage, and the load current I is transferred from the even-numbered stage to the odd-numbered stage N Flows through the main vacuum tube V2 and the output of the transition switch Z2;
(6) as shown IN fig. 1 and fig. 2(f), the auxiliary vacuum tubes V3 and V4 are simultaneously disconnected, the circulating current IC is cut off by the auxiliary vacuum tube V3, and the even-numbered stage load current IN flows through the main vacuum tube V2 and the transition switch Z1 for output;
(7) as shown IN fig. 1 and fig. 2(g), after the arc IN the auxiliary vacuum tube V3 is completely extinguished, the main switch MC2 is turned on, and the even-numbered stage load current IN flows through the main switch MC2 and is output;
(8) as shown IN fig. 1 and 2(h), the operation arm of the switching transition switch Z2 is connected from the connecting stationary contact 21 to the connecting stationary contact 22, and the even-numbered stage load current IN flows through the main switch MC2 and is output.
At this time, the tap changing operation is finished, and the change-over switch completes the voltage regulation of switching from the odd gear to the even gear.
The main vacuum tube V1 and the main vacuum tube V2 isolate the transition switch Z1 from the tapping side, and when the transition switch Z1 is switched, the main vacuum tube V1 and the main vacuum tube V2 are in a disconnected state.
The auxiliary vacuum tube V3 and the auxiliary vacuum tube V4 isolate the transition switch Z2 from the tapping side, and when the transition switch Z2 is switched, the main vacuum tubes V3 and V4 are in a disconnected state.
IN the embodiment of the present invention, when the on-load tap changer is on the even tap side, as shown IN fig. 3, the even-numbered load current IN flows through the main switch MC2 for output.
The on-load tap-changer is converted from an even gear to an odd gear and comprises the following steps:
(1) as shown IN fig. 3 and fig. 4(a), the main switch MC2 is turned off, and the even-numbered stage load current IN flows through the main vacuum tube V2 and the transition switch Z1 for output;
(2) as shown IN fig. 3 and fig. 4(b), the auxiliary vacuum tubes V3 and V4 are turned on simultaneously, and the even-numbered stage load current IN flows through the main vacuum tube V2 and the transition switch Z1 for output;
(3) as shown IN fig. 3 and 4(c), the main vacuum tube V2 is disconnected, the load current IN is cut off, an arc is generated, and after the arc is extinguished, the even-numbered load current IN flows through the auxiliary vacuum tube V4, the transition switch Z2 and the transition resistor R for output;
(4) as shown IN fig. 3 and 4(d), after the arc IN the main vacuum tube V2 is completely extinguished, the moving arm of the transition switch Z1 is switched from the connecting static contact 12 to the static contact 11, and the even-numbered load current IN flows through the auxiliary vacuum tube V4, the transition switch Z2 and the transition resistor R to be output;
(5) as shown IN fig. 3 and fig. 4(e), the main vacuum tube V2 is turned on, the transition circuit is connected to the even-numbered stage and the odd-numbered stage at the same time to form a bridge connection, a circulating current IC is generated, at this time, the load current is transferred from the even-numbered stage to the odd-numbered stage, and the load current IN of the odd-numbered stage flows through the main vacuum tube V1 and the transition switch Z2 to be output;
(6) as shown IN fig. 3 and fig. 4(f), the auxiliary vacuum tubes V3 and V4 are simultaneously disconnected, the circulating current IC is cut off by the auxiliary vacuum tube V4, and the odd-numbered stage load current IN flows through the main vacuum tube V1 and the transition switch Z1 for output;
(7) as shown IN fig. 3 and fig. 4(g), after the arc IN the auxiliary vacuum tube V4 is completely extinguished, the main switch MC1 is turned on, and the odd-numbered stage load current IN flows through the main switch MC1 and is output;
(8) as shown IN fig. 3 and 4(h), the operation arm of the switching transition switch Z2 is connected from the connecting stationary contact 22 to the connecting stationary contact 21, and the odd-numbered stage load current IN flows through the main switch MC1 and is output.
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.
In the above embodiment, when the odd-numbered stage is shifted to the even-numbered stage, the operation timing is as shown in fig. 5, the main vacuum tube V1 cuts off the load current, and the auxiliary vacuum tube V3 cuts off the circulating current; when the even-numbered stage is shifted to the odd-numbered stage, the operation timing is as shown in fig. 6, and the main vacuum line V2 cuts off the load current and the auxiliary vacuum line V4 cuts off the circulating current. The main vacuum tubes V1 and V2 cut off load current in turn, and the auxiliary vacuum tubes V3 and V4 cut off circulation in turn, so that the switching capacity of the vacuum tubes is reduced, the operation reliability of the vacuum tubes is obviously improved, and the electrical service life of the whole switch is greatly prolonged.
In the above embodiment, the vacuum tubes V1 and V2 isolate the transition switch Z1 from the tapping side, when the transition switch Z1 is switched, the main vacuum tube V1 and V2 are in a disconnected state, which can prevent the static contact 11 or the static contact 12 from discharging with a floating potential, even if the main vacuum tube V1 or V2 is not reliably arc-extinguished, the transition contact Z1 may be subjected to current arcing, and because the corresponding main vacuum tube V2 or V1 has a fracture, the inter-stage short circuit probability caused by the current arcing of Z1 can be effectively reduced, and the fault probability caused by the unreliable arc-extinguishing of the vacuum tube is greatly reduced.
In the above embodiment, the vacuum tubes V3 and V4 isolate the transition switch Z2 from the tapping side, when the transition switch Z2 is switched, the main vacuum tube V3 and the main vacuum tube V4 are in an off state, which can prevent the static contact 21 or the static contact 22 from discharging due to the floating potential, even if the V3 or V4 auxiliary vacuum tube is not reliably arc-extinguished, the transition contact Z2 may be current-carrying arc-pulled, and because the corresponding auxiliary vacuum tube V4 or V3 has a fracture, the inter-stage short-circuit probability caused by the current-carrying arc-pulled by Z2 can be effectively reduced, and the fault probability caused by the unreliable arc-extinguishing of the vacuum tube is greatly reduced.
In the above embodiment, except that the timing of the transition switch Z2 is a quasi-symmetric timing, all the other devices are completely symmetric timings, and a reciprocating switching cam design can be directly implemented, and only one layer of cam track and profile is used. For the quasi-symmetrical time sequence of the transition switch Z2, the reciprocating direct switching of the quasi-symmetrical time sequence can be directly realized through the matching of double cams; the utility model discloses a topological structure and chronogenesis can reciprocal direct switch over, have reduced the mechanical complexity who has on-load tap-changer, have improved reliability and mechanical life.
The utility model has the advantages of:
1. when the odd gear is switched to the even gear, the main vacuum tube V1 cuts off the load current, and the auxiliary vacuum tube V3 cuts off the circulation current; when the even gear is switched to the odd gear, the main vacuum tube V2 cuts off the load current, and the auxiliary vacuum tube V4 cuts off the circulation current. The main vacuum tubes V1 and V2 cut off load current in turn, and the auxiliary vacuum tubes V3 and V4 cut off circulation in turn, so that the arc ablation condition of the vacuum tubes is reduced, and the operation reliability of the vacuum tubes is remarkably improved.
2. The main vacuum tubes V1 and V2 isolate the transition switch Z1 from the tapping side, and when the transition switch Z1 operates, the main vacuum tubes V1 and V2 are in a disconnected state, so that the static contact 11 or the static contact 12 with a suspended potential can be prevented from discharging; even if the main vacuum tube V1 or V2 is not reliably quenched, the transition contact Z1 may be pulled out with current, and due to the fact that a fracture exists in the corresponding main vacuum tube V2 or V1, the inter-stage short circuit probability caused by the fact that Z1 is pulled out with current can be effectively reduced, and the fault probability caused by the fact that the vacuum tube is not reliably quenched is greatly reduced.
3. The auxiliary vacuum tubes V3 and V4 isolate the transition switch Z2 from the tapping side, and when the transition switch Z2 operates, the transition vacuum tubes V3 and V4 are in a disconnected state, so that the static contact 21 or the static contact 22 with a suspended potential can be prevented from discharging; even if the V3 or V4 auxiliary vacuum tube is not reliably quenched, the transition contact Z2 may be pulled out with current, and due to the fact that a fracture exists in the corresponding auxiliary vacuum tube V4 or V3, the inter-stage short circuit probability caused by the fact that Z2 is pulled out with current can be effectively reduced, and the fault probability caused by the fact that the vacuum tube is not reliably quenched is greatly reduced.
4. Except that the time sequence of the transition switch Z2 is a quasi-symmetrical time sequence, other devices are completely symmetrical time sequences, the design of reciprocating switching cams can be directly implemented, and only one layer of cam track and profile line is used. For the quasi-symmetrical time sequence of the transition switch Z2, the reciprocating direct switching of the quasi-symmetrical time sequence can be directly realized through the matching of double cams; the utility model discloses a topological structure and chronogenesis can reciprocal direct switch over, have reduced the mechanical complexity who has on-load tap-changer, have improved reliability and mechanical life.
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 the preferred embodiment and all changes and modifications that fall within the scope of the present 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 (8)
1. A vacuum loaded tap switch single resistance transition circuit is characterized by comprising:
main switches MC1 and MC2, transition switches Z1 and Z2, transition resistor R, main vacuum tubes V1 and V2, and auxiliary vacuum tubes V3 and V4;
one end of the main switch MC1 is connected with the odd-numbered tapping side of the on-load tapping switch, and the other end of the main switch MC1 is connected with the neutral point of the transformer;
one end of the main switch MC2 is connected with an even-numbered tapping side of the on-load tapping switch, and the other end of the main switch MC2 is connected with a neutral point of the transformer;
the transition switch Z1 includes: the device comprises a fixed contact 11, a fixed contact 12 and an action arm, wherein the rotating end of the action arm is connected with any one of the fixed contact 11 and the fixed contact 12, and the fixed end of the action arm is connected with a neutral point of a transformer;
the transition switch Z2 comprises: the device comprises a fixed contact 21, a fixed contact 22 and an action arm, wherein the rotating end of the action arm is connected with any one of the fixed contact 21 and the fixed contact 22, and the fixed end of the action arm is connected with a transition resistor R;
two ends of the transition resistor R are respectively connected with the fixed end of the action arm of the transition switch Z2 and the neutral point of the transformer;
two ends of the main vacuum tube V1 are respectively connected with the odd tapping side and the static contact 11;
two ends of the main vacuum tube V2 are respectively connected with the static contact 12 and the even tapping side;
two ends of the auxiliary vacuum tube V3 are respectively connected with the odd tapping side and the static contact 21;
two ends of the auxiliary vacuum tube V4 are respectively connected with the static contact 22 and the even tapping side.
2. The tap changer single-resistor transition circuit of claim 1, wherein when the shift position of the on-load tap changer is in an odd-numbered shift position, the main switch MC1 is in a conducting state, the main switch MC2 is in a disconnecting state, the action arm of the transition switch Z1 is connected to the static contact 11, the action arm of the transition switch Z2 is connected to the static contact 21, the main vacuum tube V1 is in a conducting state, the main vacuum tube V2 is in a disconnecting state, and the auxiliary vacuum tubes V3 and V4 are in a disconnecting state;
the load current is connected to the transformer neutral output through the main switch MC 1.
3. The tap changer single-resistor transition circuit of claim 1, wherein when the shift position of the on-load tap changer is in an even-numbered shift position, the main switch MC1 is in an off state, the main switch MC2 is in an on state, the action arm of the transition switch Z1 is connected to the fixed contact 12, the action arm of the transition switch Z2 is connected to the fixed contact 22, the main vacuum tube V1 is in an off state, the main vacuum tube V2 is in an on state, and the auxiliary vacuum tubes V3 and V4 are in an off state;
the load current is connected to the transformer neutral output through the main switch MC 2.
4. The tap changer single resistance transition circuit of claim 1, wherein the actuation timings of the main switch MC1, the main switch MC2, the transition switch Z1, the main vacuum tube V1, the main vacuum tube V2, and the auxiliary vacuum tube V3, and the auxiliary vacuum tube V4 are all symmetric timings, and are implemented by a single cam profile.
5. The tap changer single resistance transition circuit of claim 1, wherein the actuation timing of the transition switch Z2 is quasi-symmetric timing.
6. The tap changer single resistance transition circuit of claim 1, wherein when odd gears are switched to even gears, the main vacuum tube V1 cuts off load current, and the auxiliary vacuum tube V3 cuts off circulating current; when the even gear is switched to the odd gear, the main vacuum tube V2 cuts off load current, the auxiliary vacuum tube V4 cuts off circulation, the main vacuum tube V1 and the main vacuum tube V2 cut off the load current in turn, and the auxiliary vacuum tube V3 and the auxiliary vacuum tube V4 cut off circulation in turn.
7. The tap changer single resistance transition circuit of claim 1, wherein the main vacuum tube V1 and the main vacuum tube V2 isolate the transition switch Z1 from the tap side, and when the transition switch Z1 switches, the main vacuum tube V1 and the main vacuum tube V2 are in an open state.
8. The tap changer single resistance transition circuit of claim 1, wherein the auxiliary vacuum tube V3 and the auxiliary vacuum tube V4 isolate the transition switch Z2 from the tap side, and when the transition switch Z2 switches, the main vacuum tube V3 and the main vacuum tube V4 are in an off state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123059029.1U CN217485303U (en) | 2021-12-07 | 2021-12-07 | Vacuum on-load tap-changer single-resistor transition circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123059029.1U CN217485303U (en) | 2021-12-07 | 2021-12-07 | Vacuum on-load tap-changer single-resistor transition circuit |
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