CN111799076A - Single-resistor alternating type transition circuit of vacuum on-load tap-changer and voltage regulation method - Google Patents

Single-resistor alternating type transition circuit of vacuum on-load tap-changer and voltage regulation method Download PDF

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Publication number
CN111799076A
CN111799076A CN202010592246.8A CN202010592246A CN111799076A CN 111799076 A CN111799076 A CN 111799076A CN 202010592246 A CN202010592246 A CN 202010592246A CN 111799076 A CN111799076 A CN 111799076A
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China
Prior art keywords
contact
vacuum contact
switch
main
auxiliary vacuum
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Chinese (zh)
Inventor
赵鹏
李鹏
李金忠
张书琦
汪可
李戈琦
程涣超
孙建涛
刘雪丽
李刚
徐征宇
吴标
杨帆
王健一
遇心如
王琳
梁宁川
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Priority to CN202010592246.8A priority Critical patent/CN111799076A/en
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Pending legal-status Critical Current

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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
    • 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
    • H01H9/0011—Voltage selector switches
    • 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
    • H01H9/0016—Contact arrangements for tap changers
    • 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
    • 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
    • H01H9/0066—Auxiliary contact devices
    • 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
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

The invention discloses a single-resistor alternating transition circuit of a vacuum on-load tap-changer and a voltage regulating method, wherein the transition circuit comprises: a first main contact MC1, a second main contact MC2, a first auxiliary vacuum contact V1, a second auxiliary vacuum contact V2, a main vacuum contact V3, a first switch Z1, a second switch Z2, and a transition resistor R; the invention designs two auxiliary vacuum contact branches, the circulation cut-off task is carried out by the two auxiliary vacuum contacts in turn, the switching program is symmetrical, so that the burning loss of the two transition vacuum contacts is completely consistent, the switching task of the auxiliary vacuum contacts is lightened, compared with the transition circuit of the structure of the existing 'single main vacuum contact and single auxiliary vacuum contact', the switching task of only one auxiliary vacuum contact is shared, the switching capacity of the main vacuum contact and the auxiliary vacuum contact can be balanced, and the electrical service life of the whole vacuum on-load tap-changer is prolonged.

Description

Single-resistor alternating type transition circuit of vacuum on-load tap-changer and voltage regulation method
Technical Field
The invention relates to the technical field of transformers, in particular to a single-resistor alternating type transition circuit of a vacuum on-load tap-changer and a voltage regulating method.
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. At present, most of on-load tap changers configured for transformers of rectification, smelting and railway traction are in rapid resistance switching and work by the principle that an arc contact system extinguishes an electric arc when the current crosses zero. The switching principle is particularly suitable for the tap changer with frequent switching of the transformer, the contact burning loss is serious, the failure rate of the switch is high, the carbonization speed of oil is high, and therefore the daily maintenance amount is increased for a power supply department. 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 can be composed of single resistance, double resistance, four resistance or multiple resistance transition according to the number of the transition circuit resistance, and can be composed of various transition circuits according to the contact fracture, such as single fracture, double fracture, etc. 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 arc contact of the on-load tap-changer without connecting a transition resistor isA main on-off contact that only takes the task of switching off the load current; the arc contact connected with the transition resistor is an auxiliary contact which only bears the task of breaking internal circulation. 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 resistance R is about 900～1000A, since the internal circulating current passing through the auxiliary vacuum contacts is significantly larger than the load current, the ablation degree of the main vacuum contacts and the auxiliary vacuum contacts will be different after multiple switching, and the switching burden and the electrical damage of the auxiliary vacuum contacts will be more serious.
Therefore, there is a need to provide a transition circuit that alleviates the task of switching auxiliary vacuum contacts and improves the electrical life of an on-load tap-changer.
Disclosure of Invention
The invention provides a single-resistor alternating type transition circuit of a vacuum on-load tap-changer and a voltage regulating method, and aims to solve the problem of prolonging the electrical service life of the vacuum on-load tap-changer.
In order to solve the above problems, according to one aspect of the present invention, there is provided a single resistance alternating type transition circuit of a vacuum on-load tap-changer, the transition circuit comprising: a first main contact MC1, a second main contact MC2, a first auxiliary vacuum contact V1, a second auxiliary vacuum contact V2, a main vacuum contact V3, a first switch Z1, a second switch Z2, and a transition resistor R;
one end of the first main contact MC1 is connected with an odd-numbered tapping gear of a transformer regulating winding; one end of the second main contact MC2 is connected with an even tapping gear of a transformer regulating winding; one end of the first auxiliary vacuum contact V1 is connected with an odd-numbered tapping gear of a transformer regulating winding, and the other end of the first auxiliary vacuum contact V1 is respectively connected with one end of the first switch Z1 and one end of the second switch Z2; one end of the second auxiliary vacuum contact V2 is connected with an even tap position of a transformer regulating winding, and the other end of the second auxiliary vacuum contact V2 is respectively connected with one end of the first switch Z1 and one end of the second switch Z2; the other end of the first switch Z1 is connected with one end of the transition resistor R; the other end of the second switch Z1 is connected with one end of the main vacuum contact V3; the other ends of the first main contact MC1, the second main contact MC2, the transition resistor R and the main vacuum contact V3 are all connected with a neutral point of the transformer and are used for outputting load current;
when a circulating current cutting task is carried out, the first auxiliary vacuum contact V1 and the second auxiliary vacuum contact V2 are switched alternately, so that the switching task of the auxiliary vacuum contacts is reduced, and the electrical service life of the on-load tap-changer is prolonged.
Preferably, when the first main contact MC1, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in a conducting state, the first switch Z1 conducts a line where the first auxiliary vacuum contact V1 and the transition resistor R are located, the second switch Z2 conducts a line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, the second main contact MC2 is in an open state, and a tap selector of an on-load tap changer is connected with an odd-numbered tap position of a voltage regulating winding of the transformer, load current can be output through the first main contact MC 1.
Preferably, when the second main contact MC2, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in a conducting state, the first switch Z1 conducts a line where the second auxiliary vacuum contact V2 and the transition resistor R are located, the second switch Z2 conducts a line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, the first main contact MC1 is in an open state, and a tap selector of an on-load tap changer is connected with even tap positions of a voltage regulating winding of the transformer, load current can be output through the second main contact MC 2.
Preferably, the tap selector of the on-load tap changer, wherein the switching from an odd tap position to an even tap position is performed by:
opening the first main contact MC1 and the load current INSequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is opened, an arc is generated, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located,load current I in the processNSequentially flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
the first auxiliary vacuum contact V1 is disconnected to generate an arc, after the arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to turn on the second auxiliary vacuum contact V2 and the line where the transition resistor R is located, and in the process, the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the second main contact MC2 such that the load current INAnd the current flows through the second main contact MC2 to be output, the tapping conversion operation is finished, and the primary voltage regulation is finished.
Preferably, the tap selector of the on-load tap changer, which is implemented by switching from an even tap position to an odd tap position, comprises:
opening the second main contact MC2 and the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is disconnected to generate an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNFlows through the first auxiliary vacuum contact V1 and the second auxiliary vacuum contactSwitch Z2 and vacuum contact V3 output;
the second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect the circuit where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, the load current I isNSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to turn on the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current INSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the first main contact MC1 such that the load current INAnd the current flows through the first main contact MC1 to be output, the tapping conversion operation is finished, and the primary voltage regulation is finished.
Preferably, wherein the first switch Z1 is a mechanical one-touch switch or a change-over switch; the second switch Z2 is a mechanical one-touch switch or a change-over switch.
According to another aspect of the present invention, there is provided a method for regulating voltage using a single resistance alternating transition circuit of a vacuum on-load tap changer as described above, the method comprising:
opening the first main contact MC1 and the load current INSequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is disconnected to generate an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct a line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
disconnecting stationThe first auxiliary vacuum contact V1 generates an arc, after the arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and the load current I in the processNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to turn on the second auxiliary vacuum contact V2 and the line where the transition resistor R is located, and in the process, the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the second main contact MC2 such that the load current INAnd the current flows through the second main contact MC2 to be output, the tapping conversion operation is finished, the tapping selector of the on-load tapping switch is switched from an odd tapping gear to an even tapping gear, and the primary voltage regulation is finished.
According to another aspect of the invention, there is provided a method for regulating voltage by using the vacuum on-load tap-changer single-resistor alternating-type transition circuit, the method comprising:
opening the second main contact MC2 and the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is disconnected to generate an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNFlows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3;
opening the second auxiliary vacuum contact V2 to generate an arc, and adjusting the first switch Z1 to open the second auxiliary vacuum contact V2 and the transition power after the arc is completely extinguished in the second auxiliary vacuum contact V2The line in which the resistor R is located, the load current I in the processNSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to turn on the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current INSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the first main contact MC1 such that the load current INAnd the current flows through the first main contact MC1 to be output, the tap changing operation is finished, and the tap selector of the on-load tap switch realizes the switching from an even tap gear to an odd tap gear, thereby finishing the primary voltage regulation.
The invention provides a single-resistor alternating transition circuit and a voltage regulating method of a vacuum on-load tap-changer, wherein two auxiliary vacuum contact branches are designed, a circular current cutting task is alternately served by the two auxiliary vacuum contacts, the switching program is symmetrical, so that burning loss of the two paths of transition vacuum contacts is completely consistent, the switching task of the auxiliary vacuum contacts is lightened, compared with the transition circuit with the structure of a single main vacuum contact and a single auxiliary vacuum contact at present, the switching task of only one auxiliary vacuum contact is shared, the switching capacity of the main vacuum contact and the auxiliary vacuum contact can be balanced, and the electrical service life of the whole vacuum on-load tap-changer is prolonged.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a circuit diagram of a vacuum on-load tap changer single resistance alternating transition circuit 100 according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a vacuum on-load tap changer transition circuit transition according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a transition circuit of a vacuum on-load tap changer for transitioning from an odd tap position to an even tap position according to an embodiment of the present invention;
fig. 13 is a schematic diagram of a transition circuit of a vacuum on-load tap changer for transitioning from an even tap position to an odd tap position according to an embodiment of the present invention;
fig. 14 is a circuit diagram of another vacuum on-load tap changer single resistance alternating transition circuit according to an embodiment of the present invention;
fig. 15 is a flow chart of a method 1500 for regulating voltage from an odd tap position to an even tap position using a vacuum on-load tap changer transition circuit in accordance with an embodiment of the present invention;
fig. 16 is a flow chart of a method 1600 for regulating voltage from an even tap position to an odd tap position using a vacuum on-load tap changer transition circuit in accordance with 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, 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. 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.
Fig. 1 is a circuit diagram of a vacuum on-load tap changer single resistance alternating transition circuit 100 according to an embodiment of the present invention. As shown in fig. 1, the single-resistor alternating-type transition circuit for a vacuum on-load tap changer according to the embodiment of the present invention is designed with two auxiliary vacuum contact branches, the circulation cutoff task is alternately performed by two auxiliary vacuum contacts, and the switching procedures are symmetrical, so that the burning loss of the two transition vacuum contacts is completely consistent, the switching task of the auxiliary vacuum contacts is reduced, compared with the transition circuit with the structure of the existing "single main vacuum contact and single auxiliary vacuum contact", the switching task of only one auxiliary vacuum contact is shared, the switching capacities of the main vacuum contact and the auxiliary vacuum contacts can be balanced, and the electrical life of the whole vacuum on-load tap changer is prolonged. The embodiment of the invention provides a single-resistor alternating transition circuit 100 of a vacuum on-load tap-changer, which comprises: a first main contact MC1, a second main contact MC2, a first auxiliary vacuum contact V1, a second auxiliary vacuum contact V2, a main vacuum contact V3, a first switch Z1, a second switch Z2, and a transition resistor R; one end of the first main contact MC1 is connected with an odd-numbered tapping gear of a transformer regulating winding; one end of the second main contact MC2 is connected with an even tapping gear of a transformer regulating winding; one end of the first auxiliary vacuum contact V1 is connected with an odd-numbered tapping gear of a transformer regulating winding, and the other end of the first auxiliary vacuum contact V1 is respectively connected with one end of the first switch Z1 and one end of the second switch Z2; one end of the second auxiliary vacuum contact V2 is connected with an even tap position of a transformer regulating winding, and the other end of the second auxiliary vacuum contact V2 is respectively connected with one end of the first switch Z1 and one end of the second switch Z2; the other end of the first switch Z1 is connected with one end of the transition resistor R; the other end of the second switch Z1 is connected with one end of the main vacuum contact V3; the other ends of the first main contact MC1, the second main contact MC2, the transition resistor R and the main vacuum contact V3 are all connected with a neutral point of the transformer and are used for outputting load current; when a circulating current cutting task is carried out, the first auxiliary vacuum contact V1 and the second auxiliary vacuum contact V2 are switched alternately, so that the switching task of the auxiliary vacuum contacts is reduced, and the electrical service life of the on-load tap-changer is prolonged.
Preferably, when the first main contact MC1, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in a conducting state, the first switch Z1 conducts a line where the first auxiliary vacuum contact V1 and the transition resistor R are located, the second switch Z2 conducts a line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, the second main contact MC2 is in an open state, and a tap selector of an on-load tap changer is connected with an odd-numbered tap position of a voltage regulating winding of the transformer, load current can be output through the first main contact MC 1.
Preferably, when the second main contact MC2, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in a conducting state, the first switch Z1 conducts a line where the second auxiliary vacuum contact V2 and the transition resistor R are located, the second switch Z2 conducts a line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, the first main contact MC1 is in an open state, and a tap selector of an on-load tap changer is connected with even tap positions of a voltage regulating winding of the transformer, load current can be output through the second main contact MC 2.
Preferably, wherein the first switch Z1 is a mechanical one-touch switch or a change-over switch; the second switch Z2 is a mechanical one-touch switch or a change-over switch.
In the embodiment of the present invention, the first switch Z1 is a mechanical single-contact switch, and includes a first fixed contact 12, a second fixed contact 13, and a movable contact 11; the first fixed contact 12 is connected with the odd-numbered tapping position through a first auxiliary vacuum contact V1; the second fixed contact 13 is connected with the even tapping gear through a second auxiliary vacuum contact V2; one end of the moving contact 11 is connected with the transition resistor R, and the other end is connected with the first fixed contact 12 and the second fixed contact 13 in a sliding manner. The second switch Z2 is a mechanical one-touch switch comprising: a first fixed contact 23, a second fixed contact 22 and a movable contact 21; the first fixed contact 23 is connected with the odd-numbered tapping position through a first auxiliary vacuum contact V1; the second fixed contact 22 is connected with the even tapping gear through a second auxiliary vacuum contact V2; one end of the movable contact 21 is connected with the main vacuum contact V3, and the other end is slidably connected with the first fixed contact 23 and the second fixed contact 22.
In the embodiment of the invention, when a tap selector of the on-load tap changer is connected with odd tap positions of a voltage regulating winding of a transformer, a first main contact MC1 is conducted, a second main contact MC2 is disconnected, a first auxiliary vacuum contact V1 is conducted, a second auxiliary vacuum contact V2 is conducted, a main vacuum contact V3 is conducted, a moving contact 11 of a first switch Z1 is connected with a first fixed contact 12 thereof, a moving contact 21 of a second switch Z2 is connected with a first fixed contact 23 thereof, and load current is output through the main contact MC 1. When a tapping selector of the on-load tapping switch is connected with even tapping gears of a voltage regulating winding of the transformer, the second main contact MC2 is conducted, the first main contact MC1 is disconnected, the first auxiliary vacuum contact V1 is conducted, the second auxiliary vacuum contact V2 is conducted, the main vacuum contact V3 is conducted, the moving contact 11 of the first switch Z1 is connected with the second fixed contact 13 thereof, the moving contact 21 of the second switch Z2 is connected with the second fixed contact 22 thereof, and the load current is output through the main contact MC 2.
Preferably, the tap selector of the on-load tap changer, wherein the switching from an odd tap position to an even tap position is performed by:
opening the first main contact MC1 and the load current INSequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 and is output;
disconnecting the masterThe vacuum contact V3 generates an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
the first auxiliary vacuum contact V1 is disconnected to generate an arc, after the arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to turn on the second auxiliary vacuum contact V2 and the line where the transition resistor R is located, and in the process, the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the second main contact MC2 such that the load current INAnd the current flows through the second main contact MC2 to be output, the tapping conversion operation is finished, and the primary voltage regulation is finished.
In the embodiment of the invention, assuming that the initial position of a conversion selector of a tap selector of an on-load tap-changer is unchanged, and the gear position number of the on-load tap-changer is consistent with the contact group number of the tap selector, the gear position of the on-load tap-changer is required to be raised from an odd gear position N to an even gear position N + 1.
When the tapping selector is connected with odd tapping gears of the voltage regulating winding of the transformer, as shown in fig. 2, the main contact MC1 is conducted, the main contact MC2 is disconnected, the vacuum contact V1 is conducted, the vacuum contact V2 is conducted, the vacuum contact V3 is conducted, the moving contact of the change-over switch Z1 is connected with the first fixed contact 12 thereof, the moving contact of the change-over switch Z2 is connected with the first fixed contact 23 thereof, and the load current is output through the main contact MC 1. When the tap selector is switched from an odd tap gear to an even tap, the specific operation method comprises the following steps:
(1) as shown in FIG. 2, the main contact MC1 is closed and the load current I isNOutput through the main contact MC 1;
(2) as shown in fig. 3, the main contact MC1 is opened and the load current I is appliedNSequentially passes through the vacuum contact V1, the change-over switch Z2 and the vacuum contact V3 and is output;
(3) as shown in fig. 4, the vacuum contact V3 is opened, creating an arc; after the arc is extinguished, the load current INSequentially flows through the vacuum contact V1, the change-over switch Z1 and the output of the transition resistor R, and the recovery voltage U at the two ends of the vacuum contact V3V3＝IN×R；
(4) As shown in FIG. 5, after the arc in the vacuum contact V3 is completely extinguished, the movable contact of the change-over switch Z2 is rotated from being connected with the first fixed contact 23 to being connected with the second fixed contact 22, and the load current I isNSequentially flows through the vacuum contact V1, the change-over switch Z1 and the transition resistor R output;
(5) as shown in FIG. 6, the vacuum contact V3 is closed, and the transition circuit is bridged to generate a circulating current IC＝USR; load current INFlows through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3; the current I sequentially flows through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3V2＝IN+IC(ii) a Wherein, the USIs an on-load tap-changer level voltage;
(6) as shown in fig. 7, the vacuum contact V1 is opened, creating an arc; load current INSequentially passes through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3 and is output; the recovery voltage at two ends of the vacuum contact V1 is UV1＝US；
(7) As shown in fig. 8, after the arc in the vacuum contact V1 is completely extinguished, the moving contact of the change-over switch Z1 is disconnected from the first stationary contact 12, and the load current INSequentially passes through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3 and is output;
(8) as shown in FIG. 9, vacuum contact V1 is closed and load current I is appliedNSequentially flows through a vacuum contact V2, a change-over switch Z2 and a vacuumA null contact V3 output;
(9) as shown in fig. 10, the movable contact of the changeover switch Z1 is rotated to connect the second stationary contact 13, the load current INSequentially passes through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3 and is output;
(10) as shown in FIG. 11, the main contact MC2 is closed and the load current I is appliedNThe current flows through the main contact MC2 to be output, the tapping conversion operation is finished, and the change-over switch completes the primary voltage regulation.
During the process of switching the tap selector from the odd tap position to the even tap position, the transition circuit switching process is as shown in fig. 12.
Preferably, the tap selector of the on-load tap changer, which is implemented by switching from an even tap position to an odd tap position, comprises:
opening the second main contact MC2 and the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is disconnected to generate an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNFlows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3;
the second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect the circuit where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, the load current I isNSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to turn on the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current INSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the first main contact MC1 such that the load current INAnd the current flows through the first main contact MC1 to be output, the tapping conversion operation is finished, and the primary voltage regulation is finished.
In the embodiment of the present invention, when the tap selector of the on-load tap changer is connected to the even tap position of the transformer voltage-regulating winding, as shown in fig. 11, the second main contact MC2 is turned on, the first main contact MC1 is turned off, the first auxiliary vacuum contact V1 is turned on, the second auxiliary vacuum contact V2 is turned on, the main vacuum contact V3 is turned on, the moving contact 11 of the first switch Z1 is connected to the second stationary contact 13 thereof, the moving contact 21 of the second switch Z2 is connected to the second stationary contact 22 thereof, and the load current is output through the second main contact MC 2. When the tap selector is switched from an even tap gear to an odd tap, the specific operation method comprises the following steps:
(1) opening the second main contact MC2 and the load current INSequentially flows through the second auxiliary vacuum contact V2, the first switch Z2 and the main vacuum contact V3 and is output;
(2) opening the vacuum contact V3 to generate an arc; after the arc is extinguished, the load current INThe recovered voltage U of the main vacuum contact V3 flows through the second auxiliary vacuum contact V2, the first switch Z1 and the output of the transition resistor R in sequenceV3＝IN×R；
(3) After the arc in the main vacuum contact V3 is completely extinguished, the movable contact of the change-over switch Z2 is rotated from being connected with the second fixed contact 22 to being connected with the first fixed contact 23, and the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z1 and the transition resistor R output;
(4) closing the main vacuum contact V3, the transition circuit forms a bridge connection, and a circulating current I is generatedC＝USR; load current INThrough the first auxiliary vacuum contact V1, the second switch Z2 and the main vacuum contact V3; a current I flowing through the first auxiliary vacuum contact V1, the second switch Z2 and the main vacuum contact V3 in this orderV1＝IN+IC(ii) a Wherein, the USFor on-load tap-changerA stage voltage;
(5) opening the second auxiliary vacuum contact V2 to create an arc; load current INSequentially flows through the first auxiliary vacuum contact V1, the change-over switch Z2 and the vacuum contact V3 and is output; the recovery voltage at two ends of the vacuum contact V2 is UV2＝US；
(6) After the arc in the second auxiliary vacuum contact V2 is completely extinguished, the moving contact of the first switch Z1 is disconnected with the second fixed contact 13, and the load current I isNSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
(7) the second auxiliary vacuum contact V2 is closed and the load current IN is output through the first auxiliary vacuum contact V1, the second switch Z2 and the main vacuum contact V3 IN that order;
(8) adjusting the movable contact 11 of the first transfer switch Z1 to rotate to connect the first fixed contact 12, the load current INSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the main vacuum contact V3 and is output;
(9) closing the first main contact MC1, the load current INThe current flows through the first main contact MC1 to be output, the tapping conversion operation is finished, and the change-over switch completes the primary voltage regulation.
During the process of switching the tap selector from the even tap position to the odd tap position, the transition circuit switching procedure is as shown in fig. 13. Wherein,
in an embodiment of the invention, the switching tasks of the on-load tap-changer transition circuit are as follows:
Figure BDA0002556046990000141
wherein, INIs the load current; us is an on-load tap-changer level voltage; and R is transition resistance.
Fig. 14 is a circuit diagram of another single-resistor alternative type transition circuit of the vacuum on-load tap-changer according to the embodiment of the invention. As shown in fig. 14, only the first switch and the second switch in fig. 1 are set as the transfer switches, other elements are the same as those in fig. 1, and the function and action are also the same as those of the transition circuit shown in fig. 1, and are not described again here.
Fig. 15 is a flow chart of a method 1500 for regulating voltage from an odd tap position to an even tap position using a vacuum on-load tap changer transition circuit in accordance with an embodiment of the present invention. As shown in fig. 15, according to the method 1500 of voltage regulation using a single-resistor alternating-type transition circuit of a vacuum on-load tap-changer provided by the embodiment of the present invention, starting from step 1501, the first main contact MC1 is opened at step 1501, and the load current I is measuredNThrough the first auxiliary vacuum contact V1, the switch Z2, and the main vacuum contact V3 output, in that order.
In step 1502, the main vacuum contact V3 is opened to generate an arc, and after the arc is completely extinguished in the main vacuum contact V3, the second switch Z2 is adjusted to conduct the line in which the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, during which the load current I is appliedNThrough the first auxiliary vacuum contact V1, the first switch Z1, and the transition resistor vout, in that order.
In step 1503, the main vacuum contact V3 is closed, where a transition circuit bridges and the load current INSequentially through the second auxiliary vacuum contact V2, the second switch Z2, and the main vacuum contact V3.
At step 1504, the first auxiliary vacuum contact V1 is opened to generate an arc, and after the arc is completely extinguished in the first auxiliary vacuum contact V1, the first switch Z1 is adjusted to disconnect the line with the first auxiliary vacuum contact V1 and the transition resistor R, during which the load current I isNSequentially through the second auxiliary vacuum contact V2, the second switch Z2, and the main vacuum contact V3.
In step 1505, the first auxiliary vacuum contact V1 is closed, and the first switch Z1 is adjusted to open the line on which the second auxiliary vacuum contact V2 and the transition resistor R are located, during which the load current INSequentially through the second auxiliary vacuum contact V2, the second switch Z2, and the main vacuum contact V3.
At step 1506, the second primary contact MC2 is closed such that a load current I is drawnNThe current flows through the output of the second main contact MC2, the tap change operation is finished, and the tap of the on-load tap-changer is realizedThe selector is switched from an odd tap gear to an even tap gear to complete primary voltage regulation.
The voltage regulating method 1500 for switching from an odd tap position to an even tap position by using a vacuum on-load tap-changer transition circuit according to an embodiment of the present invention corresponds to the single-resistor alternating-type transition circuit 100 for a vacuum on-load tap-changer according to another embodiment of the present invention, and is not described herein again.
Fig. 16 is a flow chart of a method 1600 for regulating voltage from an even tap position to an odd tap position using a vacuum on-load tap changer transition circuit in accordance with an embodiment of the present invention. As shown in fig. 16, in the method 1600 for voltage regulation using the single-resistor alternating-type transition circuit of the vacuum on-load tap-changer according to the embodiment of the present invention, starting from step 1601, the second main contact MC2 is opened at step 1601, and the load current I is measuredNThrough the second auxiliary vacuum contact V2, the second switch Z2, and the main vacuum contact V3, in that order.
In step 1602, the main vacuum contact V3 is opened to generate an arc, and after the arc is completely extinguished in the main vacuum contact V3, the second switch Z2 is adjusted to conduct the line in which the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, during which the load current I is appliedNThrough the second auxiliary vacuum contact V2, the first switch Z1, and the transition resistor vout, in that order.
At 1603, the main vacuum contact V3 is closed, at which time a transition circuit is bridged and the load current I is appliedNThrough the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3.
In step 1604, the second auxiliary vacuum contact V2 is opened to generate an arc, and after the arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, during which the load current I isNSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3.
In step 1605, the second auxiliary vacuum contact V2 is closed, and the first switch Z1 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, in which process a negative voltage is appliedCurrent carrying capacity INFlows in turn through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3.
At step 1606, the first primary contact MC1 is closed such that the load current I isNAnd the current flows through the first main contact MC1 to be output, the tap changing operation is finished, and the tap selector of the on-load tap switch realizes the switching from an even tap gear to an odd tap gear, thereby finishing the primary voltage regulation.
The voltage regulation method 1600 for switching from an odd tap position to an even tap position by using a vacuum on-load tap-changer transition circuit according to an embodiment of the present invention corresponds to the single-resistor alternating-type transition circuit 100 for a vacuum on-load tap-changer according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (8)

1. A single-resistor alternating-type transition circuit for a vacuum on-load tap-changer, the transition circuit comprising: a first main contact MC1, a second main contact MC2, a first auxiliary vacuum contact V1, a second auxiliary vacuum contact V2, a main vacuum contact V3, a first switch Z1, a second switch Z2, and a transition resistor R;
one end of the first main contact MC1 is connected with an odd-numbered tapping gear of a transformer regulating winding; one end of the second main contact MC2 is connected with an even tapping gear of a transformer regulating winding; one end of the first auxiliary vacuum contact V1 is connected with an odd-numbered tapping gear of a transformer regulating winding, and the other end of the first auxiliary vacuum contact V1 is respectively connected with one end of the first switch Z1 and one end of the second switch Z2; one end of the second auxiliary vacuum contact V2 is connected with an even tap position of a transformer regulating winding, and the other end of the second auxiliary vacuum contact V2 is respectively connected with one end of the first switch Z1 and one end of the second switch Z2; the other end of the first switch Z1 is connected with one end of the transition resistor R; the other end of the second switch Z1 is connected with one end of the main vacuum contact V3; the other ends of the first main contact MC1, the second main contact MC2, the transition resistor R and the main vacuum contact V3 are all connected with a neutral point of the transformer and are used for outputting load current;
when a circulating current cutting task is carried out, the first auxiliary vacuum contact V1 and the second auxiliary vacuum contact V2 are switched alternately, so that the switching task of the auxiliary vacuum contacts is reduced, and the electrical service life of the on-load tap-changer is prolonged.
2. The transition circuit of claim 1, wherein when the first main contact MC1, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in a conducting state, the first switch Z1 conducts the line on which the first auxiliary vacuum contact V1 and the transition resistor R are located, the second switch Z2 conducts the line on which the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, the second main contact MC2 is in an open state, and the tap selector of the on-load tap changer is connected to the odd tap positions of the transformer tap winding, load current can be output through the first main contact MC 1.
3. The transition circuit of claim 1, wherein when the second main contact MC2, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in a conducting state, the first switch Z1 conducts the line on which the second auxiliary vacuum contact V2 and the transition resistor R are located, the second switch Z2 conducts the line on which the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, the first main contact MC1 is in an open state, and the tap selector of the on-load tap changer is connected to the even tap positions of the transformer tap winding, load current can be output through the second main contact MC 2.
4. The transition circuit of claim 1, wherein switching a tap selector of an on-load tap changer from an odd tap position to an even tap position is accomplished by:
opening the first main contact MC1 and the load current INSequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is disconnected to generate an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct a line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
the first auxiliary vacuum contact V1 is disconnected to generate an arc, after the arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the first auxiliary vacuum contact V1 and adjusting the first switch Z1 to conduct the second auxiliary vacuumThe contact V2 and the transition resistor R, in the process of which the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the second main contact MC2 such that the load current INAnd the current flows through the second main contact MC2 to be output, the tapping conversion operation is finished, and the primary voltage regulation is finished.
5. The transition circuit of claim 1, wherein switching a tap selector of an on-load tap changer from an even tap position to an odd tap position is accomplished by:
opening the second main contact MC2 and the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is disconnected to generate an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNFlows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3;
the second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect the circuit where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, the load current I isNSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to turn on the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current INSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
close the firstA main contact MC1 for making the load current INAnd the current flows through the first main contact MC1 to be output, the tapping conversion operation is finished, and the primary voltage regulation is finished.
6. The transition circuit of claim 1, wherein the first switch Z1 is a mechanical one-contact switch or a transfer switch; the second switch Z2 is a mechanical one-touch switch or a change-over switch.
7. A method for voltage regulation by using the single-resistor alternating-type transition circuit of the vacuum on-load tap-changer according to any one of claims 1 to 6, wherein the method comprises the following steps:
opening the first main contact MC1 and the load current INSequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is disconnected to generate an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct a line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
the first auxiliary vacuum contact V1 is disconnected to generate an arc, after the arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current I isNSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to turn on the second auxiliary vacuum contact V2 and the line where the transition resistor R is located, and in the process, the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3;
closing the second main contact MC2 such that the load current INAnd the current flows through the second main contact MC2 to be output, the tapping conversion operation is finished, the tapping selector of the on-load tapping switch is switched from an odd tapping gear to an even tapping gear, and the primary voltage regulation is finished.
8. A method for regulating voltage by using the vacuum on-load tap-changer single-current single-resistance alternating-type transition circuit according to any one of claims 1 to 6, wherein the method comprises the following steps:
opening the second main contact MC2 and the load current INSequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 and is output;
the main vacuum contact V3 is disconnected to generate an arc, after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, and the load current I in the processNSequentially flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R output;
closing the main vacuum contact V3, wherein the transition circuit is bridged and the load current I isNFlows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3;
the second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect the circuit where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, the load current I isNSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to turn on the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, the load current INSequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 and is output;
closing the first main contact MC1 such that the load current INFlows through the first main contact MC1 and is outputAnd when the tapping conversion operation is finished, the tapping selector of the on-load tapping switch is switched from an even tapping gear to an odd tapping gear, and primary voltage regulation is completed.
CN202010592246.8A 2020-06-24 2020-06-24 Single-resistor alternating type transition circuit of vacuum on-load tap-changer and voltage regulation method Pending CN111799076A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4250320A4 (en) * 2020-11-18 2024-10-16 China Electric Power Res Institute Company Limited Symmetrical vacuum bubble load-balancing transition circuit apparatus, and control method
CN113851314A (en) * 2021-09-28 2021-12-28 西安交通大学 Single-resistor symmetrical transition circuit of on-load tap-changer and voltage regulation method

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