CN215680375U - Single-resistor symmetrical transition circuit of on-load tap-changer - Google Patents
Single-resistor symmetrical transition circuit of on-load tap-changer Download PDFInfo
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- CN215680375U CN215680375U CN202122372227.7U CN202122372227U CN215680375U CN 215680375 U CN215680375 U CN 215680375U CN 202122372227 U CN202122372227 U CN 202122372227U CN 215680375 U CN215680375 U CN 215680375U
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Abstract
The utility model discloses a single-resistor symmetrical transition circuit of an on-load tap-changer, which comprises: the vacuum contactor comprises a first main contact, a second main contact, a main vacuum contact, a first auxiliary vacuum contact, a second auxiliary vacuum contact, a first isolating switch, a second isolating switch, a change-over switch and a transition resistor. Two auxiliary switch elements exist in the transition circuit, the inter-electrode circulation current in the load switching process is switched on and off in turn, the switching process is symmetrical, the switching-on and switching-off current tasks of the two auxiliary switch elements are consistent, the switching loss of the auxiliary switch elements is reduced, and the switching capacity of the main switch element and the auxiliary switch elements can be balanced; only one transition resistor is used in the transition circuit, so that the design and installation are facilitated and the insulation distance is ensured; two isolating switches are designed, so that the isolating switch can play a role in electrical isolation, can also be used as a protection switch of an auxiliary switch element, and can prevent the fault that the current cannot be cut off after the auxiliary switch element fails.
Description
Technical Field
The utility model relates to the technical field of on-load tap-changers, in particular to a single-resistor symmetrical transition circuit of an on-load tap-changer.
Background
The on-load tap changer is a key component in the power transformer, can be operated under the excitation or load state of the transformer, and can realize the regulation of output voltage under the condition of not interrupting load current by changing the effective turn ratio by changing a plurality of tap joints led out from a transformer winding. The on-load tap-changer has wide application range, and is particularly applied to a converter transformer of an extra-high voltage direct-current transmission project to ensure the rated trigger angle of a converter in normal operation. The on-load tap-changer equipped with the early power transformer mostly adopts the high-speed resistance switching principle and carries out load conversion by a copper-tungsten arc contact. The oil-immersed non-vacuum on-load tap-changer has frequent switching, correspondingly serious burning loss of an arc contact and high carbonization and pollution speed of oil, thereby increasing the workload of daily maintenance and regular overhaul for a power supply department. The vacuum type on-load tap-changer mainly uses a vacuum tube to realize arc extinguishing, thereby avoiding carbonization and pollution of arc extinguishing in oil to the oil; because the arc-breaking time of the vacuum tube is short, the arc voltage is low, the energy consumption of the electric arc is low, and the contact metal vapor is re-condensed, the burning loss and corrosion of the contact can be reduced to the minimum. The power electronic on-load tap changer replaces a vacuum tube by a power electronic element so as to realize the operation without breaking electric arcs in the on-load switching process.
The on-load tap-changer consists of a change-over switch, a tap-changer and an electric mechanism. The transfer switch is provided with an independent oil chamber, is a key component for realizing on-load switching of the tap switch, and adopts a transition circuit at the core. The vacuum type on-load tap-changer can be divided into a single-contact circuit, a double-contact circuit, a three-contact circuit and a four-contact circuit according to different numbers of vacuum tubes; according to the number of transition resistors, the single resistor and the double resistor transition are adopted; single fracture, double fracture and the like are formed according to the number of the contact fractures; the various combinations can form different types of vacuum type on-load tap-changer transition circuits. The switch element in the transition circuit can be a single-break vacuum contact, a double-break vacuum contact, a power electronic element and the like; different transition circuits have different switching sequences for realizing on-load voltage regulation, and the switching tasks of the switching elements are different. The topological structure of the transition circuit has obvious influence on the reliability of the on-load tap-changer switching process, the failure rate of the switch and the electrical service life.
The on-load tap changer transition circuit has a main on-off switch element which only takes the task of switching off load current and an auxiliary switch element which only takes the task of switching off inter-stage circulating current. In the actual extra-high voltage direct current transmission project, the load current flowing through the on-load tap changer of the converter transformer is about 500-600A, the interstage circulating current flowing through the transition resistor in the switching process is about 900-1000A, and the circulating current of the single on-off of the auxiliary switch element is obviously larger than the load current of the on-off of the main on-off switch element, so that the on-off tasks of the auxiliary switch element and the main on-off switch element are unbalanced.
SUMMERY OF THE UTILITY MODEL
The single-resistor symmetrical transition circuit of the on-load tap-changer provided by the utility model has the advantages of symmetrical element distribution and symmetrical switching time sequence, can improve the reliability and switching efficiency of the on-load tap-changer, and has the advantages of less transition resistance and alternate loading of auxiliary switch elements.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a single-resistor symmetrical transition circuit of an on-load tap-changer comprises: the transformer voltage regulating circuit comprises a first main contact, a second main contact, a main vacuum contact, a first auxiliary vacuum contact, a second auxiliary vacuum contact, a first isolating switch, a second isolating switch, a change-over switch, a transition resistor, a first winding tap of a transformer voltage regulating winding, a second winding tap of the transformer voltage regulating winding and a neutral point leading-out end of an on-load tap-changer;
the transformer voltage regulating switch comprises a first main contact, a first auxiliary vacuum contact, a first fixed contact, a second auxiliary vacuum contact, a second main contact and a second fixed contact, wherein the first main contact, the first auxiliary vacuum contact and the first fixed contact in the change-over switch are connected with a first winding tap of a transformer voltage regulating winding, the other end of the first auxiliary vacuum contact is connected with one end of a first isolating switch, the second auxiliary vacuum contact, one end of the second main contact and the second fixed contact in the change-over switch are connected with a second winding tap of the transformer voltage regulating winding, one end of the main vacuum contact is connected with a moving contact in the change-over switch, the other end of the second auxiliary vacuum contact is connected with one end of a second isolating switch, the other ends of the first isolating switch and the second isolating switch are connected with one end of a transition resistor, and the other ends of the first main contact, the main vacuum contact, the transition resistor and the second main contact are all connected with a neutral point leading-out end of the on-load tap-off switch.
Furthermore, the first main contact is conducted, the second main contact is disconnected, the main vacuum contact is conducted, the first auxiliary vacuum contact is disconnected with the second auxiliary vacuum contact, the moving contact in the change-over switch is connected with the first fixed contact, the first isolating switch is conducted, and when the second isolating switch is disconnected, the load current flows out from the neutral point leading-out end of the on-load tap-changer through the first main contact.
Furthermore, the first main contact is disconnected, the second main contact is disconnected, the main vacuum contact is connected, the first auxiliary vacuum contact and the second auxiliary vacuum contact are disconnected, the moving contact in the change-over switch is connected with the first fixed contact, the first isolating switch is connected, when the second isolating switch is disconnected, the first winding tap is connected, and the load current flows out from the neutral point leading-out end of the on-load tap-changer through the change-over switch and the main vacuum contact.
Furthermore, the first main contact is disconnected, the second main contact is disconnected, the main vacuum contact is connected, the first auxiliary vacuum contact and the second auxiliary vacuum contact are connected, the moving contact in the change-over switch is connected with the first fixed contact, the first isolating switch is connected, when the second isolating switch is disconnected, the first winding tap is connected, and the load current continuously flows out from the neutral point leading-out end of the on-load tap-changer through the change-over switch and the main vacuum contact.
Furthermore, the first main contact is disconnected, the second main contact is disconnected, the main vacuum contact is disconnected, an electric arc is generated, the first auxiliary vacuum contact and the second auxiliary vacuum contact are conducted, a moving contact in the change-over switch is connected with the first fixed contact, the first isolating switch is conducted, when the second isolating switch is disconnected, the first winding tap is conducted, and the load current flows out from a neutral point leading-out end of the on-load tap-changer through the first auxiliary vacuum contact, the first isolating switch, the transition resistor and the on-load tap-changer.
Further, the first main contact is disconnected, the second main contact is disconnected, the main vacuum contact is disconnected, the first auxiliary vacuum contact and the second auxiliary vacuum contact are conducted, when the main vacuum contact is completely extinguished, the moving contact in the change-over switch is rotated to be connected with the second fixed contact, the first isolating switch is conducted, when the second isolating switch is disconnected, the first winding tap is conducted, and the load current flows out from the neutral point leading-out end of the on-load tap-changer through the first auxiliary vacuum contact, the first isolating switch and the transition resistor.
Furthermore, the first main contact is disconnected, the second main contact is disconnected, the main vacuum contact is conducted, the first auxiliary vacuum contact and the second auxiliary vacuum contact are conducted, the moving contact in the change-over switch is connected with the second fixed contact, the first isolating switch is conducted, when the second isolating switch is disconnected, the first winding tap and the second winding tap are both conducted, and the load current flows out from the neutral point leading-out end of the on-load tap-changer through the change-over switch and the main vacuum contact.
Furthermore, the first main contact is disconnected, the second main contact is disconnected, the main vacuum contact is conducted, the first auxiliary vacuum contact and the second auxiliary vacuum contact are disconnected, the moving contact in the change-over switch is connected with the second fixed contact, the first isolating switch is conducted, when the second isolating switch is disconnected, the second winding tap is conducted, and the load current flows out from the neutral point leading-out end of the on-load tap-changer through the change-over switch, the main vacuum contact and the on-load tap-changer.
Furthermore, the first main contact is disconnected, the second main contact is disconnected, the main vacuum contact is connected, the first auxiliary vacuum contact and the second auxiliary vacuum contact are disconnected, the moving contact in the change-over switch is connected with the second fixed contact, the first isolating switch is disconnected when the arc in the first auxiliary vacuum contact is completely extinguished, the second winding tap is connected when the second isolating switch is connected, and the load current flows out through the change-over switch, the main vacuum contact and the neutral point leading-out end of the on-load tap-changer.
Furthermore, the first main contact is disconnected, the second main contact is connected, the main vacuum contact is connected, the first auxiliary vacuum contact and the second auxiliary vacuum contact are disconnected, the moving contact in the change-over switch is connected with the second fixed contact, the first isolating switch is disconnected, when the second isolating switch is connected, the second winding tap is connected, and the load current flows out from the neutral point leading-out end of the on-load tap-changer through the second main contact.
A voltage regulation method of a single-resistor symmetrical transition circuit of an on-load tap-changer comprises the following steps:
when the change-over switch is connected with the first winding tap, the first main contact is disconnected, the second main contact is disconnected, the first auxiliary vacuum contact is disconnected, the main vacuum contact is connected, the first isolating switch is connected, the second isolating switch is disconnected, the change-over switch is connected with the first winding tap, the first main contact is disconnected, the first auxiliary vacuum contact is connected, the second auxiliary vacuum contact is connected, the main vacuum contact is disconnected, and an electric arc is generated; after the main vacuum contact is completely extinguished, controlling the change-over switch to enable the main vacuum contact to be connected with the second winding tap; then the main vacuum contact is conducted, the first auxiliary vacuum contact is disconnected, the second auxiliary vacuum contact is disconnected, and electric arcs are generated; after the first auxiliary vacuum contact is completely extinguished, the first isolating switch is disconnected, and the second isolating switch is connected; conducting the second main contact to enable the load current to flow out from a neutral point leading-out end of the on-load tap-changer from a second winding tap through the second main contact;
the second main contact is conducted, the first main contact is disconnected, the first auxiliary vacuum contact is disconnected, the second auxiliary vacuum contact is disconnected, the first isolating switch is disconnected, the main vacuum contact is conducted, the second isolating switch is conducted, when the change-over switch is connected with the tap of the second winding, the second main contact is disconnected, the first auxiliary vacuum contact is conducted, and the second auxiliary vacuum contact is conducted; then the main vacuum contact is disconnected to generate electric arc; after the main vacuum contact is completely extinguished, controlling a change-over switch to enable the main vacuum contact to be connected with a first winding tap; then, the main vacuum contact is conducted, the first auxiliary vacuum contact is disconnected, the second auxiliary vacuum contact is disconnected, and electric arcs are generated; after the second auxiliary vacuum contact is completely extinguished, the first isolating switch is switched on, and the second isolating switch is switched off; and then the first main contact is conducted, so that the load current flows out from the neutral point leading-out end of the on-load tap-changer from the first winding tap through the first main contact.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, the first auxiliary vacuum contact and the second auxiliary vacuum contact are arranged, the interstage circulation current in the load switching process is switched on and off in turn, the switching process is symmetrical, the switching current tasks of the first auxiliary vacuum contact and the second auxiliary vacuum contact are consistent, the switching loss of the auxiliary switch element is reduced, and the switching capacity between the first main contact and the first auxiliary vacuum contact and between the second main contact and the second auxiliary vacuum contact can be balanced; only one transition resistor is used, so that the design and installation are convenient and the insulation distance is ensured; through setting up two first isolator and second isolator, both can play the electrical isolation effect, can also regard as the protection switch of auxiliary switch component, prevent the unable trouble of breaking current after the auxiliary switch component became invalid.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings:
fig. 1 is a circuit diagram of an on-load tap-changer transition circuit according to the utility model;
fig. 2 is a schematic diagram of a switching operation of a first main contact in a transition circuit of the on-load tap changer of the present invention;
fig. 3 is a schematic diagram of the switching operation of the conduction of the auxiliary vacuum contact in the on-load tap-changer transition circuit according to the present invention;
fig. 4 is a schematic diagram of the switching action of the disconnection of the main vacuum contact in the on-load tap-changer transition circuit according to the present invention;
fig. 5 is a schematic diagram of the switching operation of the change-over switch in the on-load tap-changer transition circuit according to the present invention;
fig. 6 is a schematic diagram of the switching action of the main vacuum contact conduction in the on-load tap-changer transition circuit of the present invention;
fig. 7 is a schematic diagram of the switching action of the auxiliary vacuum contacts in the on-load tap-changer transition circuit of the present invention;
fig. 8 is a schematic diagram of the switching operation of the disconnecting switch in the on-load tap-changer transition circuit according to the present invention;
fig. 9 is a schematic diagram of a switching operation of conduction of a second main contact in the on-load tap-changer transition circuit according to the present invention;
fig. 10 is a schematic diagram of the on-off of each switch in the on-load tap changer transition circuit of the present invention during the process of switching the load from winding tap N to winding tap N + 1;
fig. 11 is a schematic diagram of the on-off of each switch in the on-load tap changer transition circuit of the present invention during the process of switching the load from winding tap N +1 to winding tap N;
fig. 12 is a circuit diagram of a single resistance symmetrical transition circuit of an on-load tap changer in which the switching elements are power electronic components according to an embodiment of the present invention;
fig. 13 is a circuit diagram of a single resistance symmetrical transition circuit for an on-load tap changer with a switching element that is a dual break vacuum contact in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a single-resistor symmetric transition circuit of an on-load tap-changer, in which two auxiliary switch elements exist, which alternately cut off inter-stage loop current in the on-load switching process, the switching process is symmetric, the two auxiliary switch elements have the same current switching task, the switching loss of the auxiliary switch elements is reduced, and the switching capacities of the main switch element and the auxiliary switch elements can be balanced; only one transition resistor is used in the transition circuit, so that the design and installation are facilitated and the insulation distance is ensured; two isolating switches are designed, so that the isolating switch can play a role in electrical isolation, can also be used as a protection switch of an auxiliary switch element, and can prevent the fault that the current cannot be cut off after the auxiliary switch element fails.
Referring to fig. 1, the switching element is illustrated by taking a single-break vacuum contact as an example, and the single-resistance symmetric transition circuit of the on-load tap-changer includes: the transformer tap changer comprises a first main contact MC1, a second main contact MC2, a main vacuum contact V1, a first auxiliary vacuum contact V2, a second auxiliary vacuum contact V3, a first isolating switch Z1, a second isolating switch Z2, a change-over switch T, a transition resistor R, a first winding tap N of a transformer regulating winding, a second winding tap N +1 of the transformer regulating winding and a neutral point leading-out end of an on-load tap changer. The transfer switch T includes a moving contact, a first fixed contact 11 and a second fixed contact 12.
One end of the first main contact MC1 is connected with a first winding tap N of a transformer regulating winding; one end of the second main contact MC2 is connected with a second winding tap N +1 of the transformer regulating winding; one end of the main vacuum contact V1 is connected with a movable contact in the change-over switch T; one end of the first auxiliary vacuum contact V2 is respectively connected with a first winding tap N of a transformer voltage regulating winding and a first fixed contact 11 in a change-over switch T, and the other end of the first auxiliary vacuum contact V2 is connected with one end of the first isolating switch Z1; one end of the second auxiliary vacuum contact V3 is respectively connected with a second winding tap N +1 of a transformer voltage regulating winding and a second fixed contact 12 in the change-over switch T, and the other end is connected with one end of the second isolating switch Z2; the other ends of the first isolating switch Z1 and the second isolating switch Z2 are connected with one end of the transition resistor R; and the other ends of the first main contact MC1, the second main contact MC2, the main vacuum contact V1 and the transition resistor R are connected with a neutral point leading-out end of the on-load tap-changer.
When the first main contact MC1, the main vacuum contact V1 and the first disconnecting switch Z1 are all in a conducting state, the second disconnecting switch Z2, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are all in a disconnecting state, and the change-over switch T is connected with the first winding tap N, the on-load tap-changer transition circuit can enable load current to flow out of a neutral point outlet end of the on-load tap-changer through the first main contact MC 1.
When the second main contact MC2, the main vacuum contact V1 and the second disconnecting switch Z2 are all in a conducting state, the first disconnecting switch Z1, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are all in a disconnecting state, and the second static contact 12 in the change-over switch T is connected with the second winding tap N +1, the on-load tap-changer transition circuit enables load current to flow out of a neutral point leading-out end of the on-load tap-changer through the second main contact MC 2.
The internal switch element in the single-resistor symmetrical transition circuit of the on-load tap-changer can be replaced by a power electronic element (comprising a thyristor switch or an insulated gate bipolar transistor switch) with a controllable on-off function and a double-break vacuum contact from a single-break vacuum contact.
A voltage regulation method of a single-resistance symmetrical transition circuit of an on-load tap-changer takes a single-fracture vacuum contact as an example for explanation; when the on-load tap changer is switched from the winding tap N to the winding tap N +1, the voltage regulating method comprises the following steps:
as shown in fig. 1, the first main contact MC1 is turned on, the second main contact MC2 is turned off, the main vacuum contact V1 is turned on, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are turned off, the movable contact of the transfer switch T is connected to the first stationary contact 11, the first disconnecting switch Z1 is turned on, and the second disconnecting switch Z2 is turned off. The first winding tap N is switched on and the load current flows from the neutral outlet of the on-load tap-changer through the first main contact MC 1.
As shown in fig. 2, the first main contact MC1 is turned off, the second main contact MC2 is turned off, the main vacuum contact V1 is turned on, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are turned off, the movable contact of the transfer switch T is connected to the first stationary contact 11, the first disconnecting switch Z1 is turned on, and the second disconnecting switch Z2 is turned off. The winding tap N continues to be switched on and the load current flows from the neutral outlet of the on-load tap-changer through the diverter switch T and the main vacuum contact V1.
As shown in fig. 3, the first main contact MC1 remains open, the second main contact MC2 remains open, the main vacuum contact V1 remains conductive, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are conductive, the movable contact of the transfer switch T remains connected to the first stationary contact 11, the first disconnecting switch Z1 remains conductive, and the second disconnecting switch Z2 remains open. The first winding tap N continues to be switched on and the load current continues to flow from the neutral outlet of the on-load tap-changer through the transfer switch T and the main vacuum contact V1.
As shown in fig. 4, the first main contact MC1 remains open, the second main contact MC2 remains open, the main vacuum contact V1 is opened, an arc is generated, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 remain conductive, the movable contact of the transfer switch T remains connected to the first stationary contact 11, the first disconnector Z1 remains conductive, and the second disconnector Z2 remains open. The winding tap N continues to be switched on and the load current flows out of the neutral outlet of the on-load tap-changer through the first auxiliary vacuum contact V2, the first disconnector Z1 and the transition resistor R.
As shown in fig. 5, the first main contact MC1 is kept open, the second main contact MC2 is kept open, the main vacuum contact V1 is kept open, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are kept conductive, and when the main vacuum contact V1 is completely extinguished, the movable contact in the change-over switch T is rotated to be connected with the second stationary contact 12, the first disconnecting switch Z1 is kept conductive, and the second disconnecting switch Z2 is kept open. The winding tap N continues to be switched on and the load current continues to flow from the neutral outlet of the on-load tap-changer through the first auxiliary vacuum contact V2, the first disconnector Z1, the transition resistor R.
As shown in fig. 6, the first main contact MC1 remains open, the second main contact MC2 remains open, the main vacuum contact V1 is turned on, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 remain on, the movable contact of the transfer switch T remains connected to the second stationary contact 12, the first disconnecting switch Z1 remains on, and the second disconnecting switch Z2 remains open. The winding tap N and the winding tap N +1 are both switched on, and the load current INFlows out from the neutral point leading-out end of the on-load tap-changer through the change-over switch T and the main vacuum contact V1; the transition circuit forms a bridge connection to generate an inter-stage circulating current IC(ii) a The current flowing through the first auxiliary vacuum contact V2 is inter-stage circulating current ICCurrent I flowing through the main vacuum contact V1V＝IN-IC(ii) a Wherein IC＝USR, said USIs an on-load tap-changer stage voltage.
As shown in fig. 7, the first main contact MC1 remains open, the second main contact MC2 remains open, the main vacuum contact V1 remains conductive, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are disconnected, the movable contact of the transfer switch T remains connected to the second stationary contact 12, the first disconnecting switch Z1 remains conductive, and the second disconnecting switch Z2 remains open. The winding tap N +1 is switched on and the load current flows from the neutral outlet of the on-load tap-changer through the diverter switch T and the main vacuum contact V1.
As shown in fig. 8, the first main contact MC1 is kept open, the second main contact MC2 is kept open, the main vacuum contact V1 is kept on, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are kept open, the movable contact in the transfer switch T is kept connected with the second stationary contact 12, when the arc is completely extinguished in the first auxiliary vacuum contact V2, the first disconnecting switch Z1 is disconnected, and the second disconnecting switch Z2 is connected. The winding tap N +1 is switched on and the load current flows from the neutral outlet of the on-load tap-changer through the diverter switch T and the main vacuum contact V1.
As shown in fig. 9, the first main contact MC1 is kept open, the second main contact MC2 is turned on, the main vacuum contact V1 is kept on, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are kept open, the movable contact in the transfer switch T is kept connected to the second stationary contact 12, the first disconnecting switch Z1 is kept open, and the second disconnecting switch Z2 is kept on. Winding tap N +1 is switched on and load current flows from the neutral outlet of the on-load tap-changer through the second main contact MC 2.
The internal switch element in the single-resistor symmetrical transition circuit of the on-load tap-changer can be replaced by a power electronic element (comprising a thyristor switch or an insulated gate bipolar transistor switch) with a controllable on-off function and a double-break vacuum contact from a single-break vacuum contact.
By taking a single-fracture vacuum contact as an example, when the on-load tap-changer is switched from the winding tap N +1 to the winding tap N, the switching process is symmetrical to the switching process of the on-load tap-changer from the winding tap N to the winding tap N +1, and the voltage regulating method comprises the following steps:
the first main contact MC1 is disconnected, the second main contact MC2 is connected, the main vacuum contact V1 is connected, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are disconnected, a moving contact in the change-over switch T is connected with the second fixed contact 12, the first isolating switch Z1 is disconnected, and the second isolating switch Z2 is connected. Winding tap N +1 is switched on and load current flows from the neutral outlet of the on-load tap-changer through the second main contact MC 2.
The first main contact MC1 is kept open, the second main contact MC2 is opened, the main vacuum contact V1 is kept on, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are kept open, the movable contact in the change-over switch T is kept connected with the second fixed contact 12, the first disconnecting switch Z1 is kept open, and the second disconnecting switch Z2 is kept on. The winding tap N +1 continues to be switched on and the load current flows from the neutral outlet of the on-load tap-changer through the diverter switch T and the main vacuum contact V1.
The first main contact MC1 keeps open, the second main contact MC2 keeps open, the main vacuum contact V1 keeps on, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are connected, the moving contact in the change-over switch T keeps connected with the second fixed contact 12, the first disconnecting switch Z1 keeps open, and the second disconnecting switch Z2 keeps on. The winding tap N +1 continues to be switched on and the load current continues to flow from the neutral outlet of the on-load tap-changer through the diverter switch T and the main vacuum contact V1.
The first main contact MC1 keeps open, the second main contact MC2 keeps open, the main vacuum contact V1 is opened, an arc is generated, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 keep on, a moving contact in the change-over switch T keeps connected with the second fixed contact 12, the first isolating switch Z1 keeps open, and the second isolating switch Z2 keeps on. The winding tap N +1 is continuously switched on, and the load current flows out from the neutral point outlet end of the on-load tap-changer through the second auxiliary vacuum contact V3, the second disconnecting switch Z2 and the transition resistor R.
The first main contact MC1 keeps open, the second main contact MC2 keeps open, the main vacuum contact V1 keeps open, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 keep on, when the main vacuum contact V1 is completely extinguished, the movable contact in the change-over switch T is rotated to be connected with the first fixed contact 11, the first isolating switch Z1 keeps open, and the second isolating switch Z2 keeps on. The winding tap N +1 continues to be switched on, and the load current continues to flow out of the neutral point outlet of the on-load tap-changer through the second auxiliary vacuum contact V3, the second disconnecting switch Z2 and the transition resistor R.
The first main contact MC1 keeps open, the second main contact MC2 keeps open, the main vacuum contact V1 is conducted, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 keep conductive, the moving contact in the change-over switch T keeps connected with the first fixed contact 11, the first disconnecting switch Z1 keeps open, and the second disconnecting switch Z2 keeps conductive. The winding tap N and the winding tap N +1 are both switched on, and the load current INFlows out from the neutral point leading-out end of the on-load tap-changer through the change-over switch T and the main vacuum contact V1; the transition current forms a bridge connection to generate an inter-stage circulating current IC(ii) a The current flowing through the second auxiliary vacuum contact V3 is inter-stage circulating current ICCurrent I flowing through the main vacuum contact V1V＝IN+IC(ii) a Wherein IC＝USR, said USIs an on-load tap-changer stage voltage.
The first main contact MC1 keeps open, the second main contact MC2 keeps open, the main vacuum contact V1 keeps on, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are disconnected, the moving contact in the change-over switch T keeps connected with the first fixed contact 11, the first disconnecting switch Z1 keeps open, and the second disconnecting switch Z2 keeps on. The winding tap N is switched on and the load current flows from the neutral outlet of the on-load tap-changer through the diverter switch T and the main vacuum contact V1.
The first main contact MC1 keeps being disconnected, the second main contact MC2 keeps being disconnected, the main vacuum contact V1 keeps being conducted, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 keep being disconnected, a moving contact in the change-over switch T keeps being connected with the first fixed contact 11, when the second auxiliary vacuum contact V3 is completely extinguished, the first isolating switch Z1 is conducted, and the second isolating switch Z2 is disconnected. The winding tap N is switched on and the load current flows from the neutral outlet of the on-load tap-changer through the diverter switch T and the main vacuum contact V1.
The first main contact MC1 is conducted, the second main contact MC2 is kept disconnected, the main vacuum contact V1 is kept conducted, the first auxiliary vacuum contact V2 and the second auxiliary vacuum contact V3 are kept disconnected, a movable contact in the change-over switch T is kept connected with the first fixed contact 11, the first isolating switch Z1 is kept conducted, and the second isolating switch Z2 is kept disconnected. The winding tap N is switched on and the load current flows from the neutral outlet of the on-load tap-changer through the first main contact MC 1.
When the internal switch elements in the on-load tap-changer single-resistor symmetrical transition circuit are power electronic elements (including thyristor switches or insulated gate bipolar transistor switches) with controllable on-off functions and double-break vacuum contacts, the action time sequence and the voltage regulating method of the switch elements are consistent, and details are not repeated.
In an embodiment of the utility model, the switching tasks of the on-load tap changer transition circuit using vacuum contacts are as follows:
TABLE 1 switching tasks
Wherein, INIs the load current; u shapeSIs an on-load tap-changer level voltage; and R is transition resistance.
When the on-load tap changer is switched from N tap tapping of the winding to N +1 tap tapping of the winding, the transition circuit switching process is as shown in fig. 10;
when the on-load tap changer is switched from N +1 tap tapping of the winding to N tap tapping of the winding, the transition circuit switching process is as shown in fig. 11;
fig. 12 is a circuit diagram of a single-resistor symmetric transition circuit of an on-load tap changer in which a switching element is a power electronic element, and as shown in fig. 12, only the single-break vacuum contact in fig. 1 is replaced with a power electronic element (including a thyristor switch or an insulated gate bipolar transistor switch) with controllable on/off, and other elements are the same as those in fig. 1, and the operation timing is the same, and the function are the same as those of the transition circuit shown in fig. 1, and are not described again.
Fig. 13 is a circuit diagram of a single resistance symmetrical transition circuit of an on-load tap changer with a switching element of a double break vacuum contact; as shown in fig. 13, only the single-break vacuum contact in fig. 1 is replaced by the double-break vacuum contact, other elements are the same as those in fig. 1, the action timing sequence is the same, and the function are the same as those of the transition circuit shown in fig. 1, and are not described again.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A single-resistor symmetrical transition circuit of an on-load tap-changer is characterized by comprising: the transformer tap changer comprises a first main contact (MC1), a second main contact (MC2), a main vacuum contact (V1), a first auxiliary vacuum contact (V2), a second auxiliary vacuum contact (V3), a first isolating switch (Z1), a second isolating switch (Z2), a change-over switch (T), a transition resistor (R), a first winding tap (N) of a transformer regulating winding, a second winding tap (N +1) of the transformer regulating winding and a neutral point leading-out end of an on-load tap changer;
wherein, the first main contact (MC1), the first auxiliary vacuum contact (V2) and the first static contact (11) in the change-over switch (T) are connected with the first winding tap (N) of the transformer regulating winding, the other end of the first auxiliary vacuum contact (V2) is connected with one end of the first isolating switch (Z1), the second auxiliary vacuum contact (V3), one end of the second main contact (MC2) and the second static contact (12) in the change-over switch (T) are connected with the second winding tap (N +1) of the transformer regulating winding, one end of the main vacuum contact (V1) is connected with the moving contact in the change-over switch (T), the other end of the second auxiliary vacuum contact (V3) is connected with one end of the second isolating switch (Z2), the other ends of the first isolating switch (Z1) and the second isolating switch (Z2) are connected with one end of the transition resistor (R), and the other end of the first main contact (MC1), The other end of the main vacuum contact (V1), the other end of the transition resistor (R) and the other end of the second main contact (MC2) are connected with a neutral point leading-out end of the on-load tap-changer.
2. The single-resistor symmetrical transition circuit of the on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is conducting, the second main contact (MC2) is off, the main vacuum contact (V1) is conducting, the first auxiliary vacuum contact (V2) is disconnected from the second auxiliary vacuum contact (V3), the moving contact of the transfer switch (T) is connected with the first stationary contact (11), the first disconnector (Z1) is conducting, and when the second disconnector (Z2) is off, the load current flows out from the neutral point outlet of the on-load tap-changer through the first main contact (MC 1).
3. The single-resistor symmetrical transition circuit of the on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is open, the second main contact (MC2) is open, the main vacuum contact (V1) is conductive, the first auxiliary vacuum contact (V2) and the second auxiliary vacuum contact (V3) are open, the moving contact of the change-over switch (T) is connected with the first fixed contact (11), the first disconnector (Z1) is conductive, when the second disconnector (Z2) is open, the first winding tap (N) is connected, and the load current flows out from the neutral point terminal of the on-load tap-changer through the change-over switch (T) and the main vacuum contact (V1).
4. The single-resistor symmetrical transition circuit of the on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is open, the second main contact (MC2) is open, the main vacuum contact (V1) is conductive, the first auxiliary vacuum contact (V2) and the second auxiliary vacuum contact (V3) are conductive, the moving contact of the change-over switch (T) is connected with the first fixed contact (11), the first disconnector (Z1) is conductive, when the second disconnector (Z2) is open, the first winding tap (N) is connected, and the load current continues to flow out from the neutral point outlet of the on-load tap-changer through the change-over switch (T) and the main vacuum contact (V1).
5. The single-resistor symmetrical transition circuit of the on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is open, the second main contact (MC2) is open, the main vacuum contact (V1) is open, an arc is generated, the first auxiliary vacuum contact (V2) and the second auxiliary vacuum contact (V3) are conductive, the moving contact of the change-over switch (T) is connected with the first fixed contact (11), the first isolating switch (Z1) is conductive, when the second isolating switch (Z2) is open, the first winding tap (N) is connected, and the load current flows out from the neutral point outlet of the on-load tap-changer through the first auxiliary vacuum contact (V2), the first isolating switch (Z1) and the transition resistor (R).
6. The single-resistor symmetrical transition circuit of the on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is off, the second main contact (MC2) is off, the main vacuum contact (V1) is off, the first auxiliary vacuum contact (V2) and the second auxiliary vacuum contact (V3) are on, when the main vacuum contact (V1) is completely extinguished, the movable contact in the change-over switch (T) is rotated to be connected with the second fixed contact (12), the first isolating switch (Z1) is on, when the second isolating switch (Z2) is off, the first winding tap (N) is on, and the load current flows out from the neutral point outlet of the on-load tap-changer through the first auxiliary vacuum contact (V2), the first isolating switch (Z1) and the transition resistor (R).
7. The single-resistor symmetrical transition circuit of the on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is open, the second main contact (MC2) is open, the main vacuum contact (V1) is connected, the first auxiliary vacuum contact (V2) and the second auxiliary vacuum contact (V3) are connected, the moving contact of the change-over switch (T) is connected with the second fixed contact (12), the first disconnector (Z1) is connected, when the second disconnector (Z2) is open, the first winding tap (N) and the second winding tap (N +1) are both connected, and the load current flows out from the neutral point outlet of the on-load tap-changer through the change-over switch (T) and the main vacuum contact (V1).
8. The single-resistor symmetrical transition circuit of the on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is open, the second main contact (MC2) is open, the main vacuum contact (V1) is conductive, the first auxiliary vacuum contact (V2) and the second auxiliary vacuum contact (V3) are open, the moving contact of the change-over switch (T) is connected with the second fixed contact (12), the first disconnector (Z1) is conductive, when the second disconnector (Z2) is open, the second winding tap (N +1) is connected, and the load current flows out from the neutral point outlet of the on-load tap-changer through the change-over switch (T) and the main vacuum contact (V1).
9. The single-resistor symmetrical transition circuit of the on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is open, the second main contact (MC2) is open, the main vacuum contact (V1) is conductive, the first auxiliary vacuum contact (V2) and the second auxiliary vacuum contact (V3) are open, the moving contact of the change-over switch (T) is connected with the second fixed contact (12), the first isolating switch (Z1) is open when the arc is completely extinguished in the first auxiliary vacuum contact (V2), the second winding tap (N +1) is closed when the second isolating switch (Z2) is conductive, and the load current flows out from the neutral outlet of the on-load tap-changer through the change-over switch (T) and the main vacuum contact (V1).
10. The single-resistor symmetrical transition circuit of an on-load tap-changer according to claim 1, characterized in that the first main contact (MC1) is open, the second main contact (MC2) is conductive, the main vacuum contact (V1) is conductive, the first auxiliary vacuum contact (V2) and the second auxiliary vacuum contact (V3) are open, the moving contact of the change-over switch (T) is connected with the second stationary contact (12), the first disconnector (Z1) is open, when the second disconnector (Z2) is conductive, the second winding tap (N +1) is closed, and the load current flows out from the neutral terminal of the on-load tap-changer through the second main contact (MC 2).
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