CN109559881B - On-load capacity regulating switch - Google Patents
On-load capacity regulating switch Download PDFInfo
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- CN109559881B CN109559881B CN201910024500.1A CN201910024500A CN109559881B CN 109559881 B CN109559881 B CN 109559881B CN 201910024500 A CN201910024500 A CN 201910024500A CN 109559881 B CN109559881 B CN 109559881B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
- H01F27/2828—Construction of conductive connections, of leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/343—Preventing or reducing surge voltages; oscillations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
Abstract
The invention discloses an on-load capacitance regulating switch.A capacitance regulating transformer comprises a low-voltage winding, a high-voltage winding and an on-load capacitance regulating switch, wherein when the capacitance regulating transformer is switched by the on-load capacitance regulating switch and is in a high-capacity state, the windings of the transformer adopt a Dyn11 connection mode; when the on-load capacitance regulating switch switches the capacitance regulating transformer to a small capacity, the transformer winding adopts an Yzn11 connection mode. The invention is a special capacity-regulating transformer, which realizes Yzn11 connection when switching to small capacity, has stronger capability of bearing unbalanced load, namely stronger single-phase power supply capability, and is particularly suitable for places (such as rural areas and mountain areas) with difficult three-phase load balance; and has excellent lightning protection characteristics, and is particularly suitable for lightning protection transformers in areas with high lightning or areas with high soil resistivity.
Description
Technical Field
The invention belongs to the technical field of transformer equipment in the power industry, and particularly relates to an on-load capacitance regulating switch.
Background
The on-load capacity regulating transformer has two kinds of rated capacity, and the corresponding capacity regulating switches are used to switch the connection mode of the transformer windings without cutting off the power supply according to the load, so as to realize the switching of the transformer between two kinds of different capacity.
The lightning protection measure of the on-load capacity-regulating transformer in the current market is realized by an external lightning protection device, and the device for lightning protection by destroying the structure of the device is high in cost and poor in lightning protection effect; in addition, the structure of the existing capacity regulating switch also limits the lightning protection effect of the on-load capacity regulating transformer.
Chinese patent CN105321744 discloses a transformer on-load capacitance-regulating switch, which adopts a vacuum arc-extinguishing chamber to form a high-voltage coil switching system and a low-voltage coil switching system, effectively solves the arc-extinguishing problem on the high-voltage side and the low-voltage side, and has the advantages of maintenance-free and long service life.
In the working process of the capacitance-regulating switch, the low-voltage transition vacuum arc-extinguishing chamber needs to complete the actions of switching-off, switching-on and switching-off once when the permanent magnetic mechanism acts, and before the low-voltage transition vacuum arc-extinguishing chamber performs the actions from switching-on to switching-off, the low-voltage transition vacuum arc-extinguishing chamber needs to wait for effective arc extinction after the low-voltage first parallel vacuum arc-extinguishing chamber and the low-voltage second parallel vacuum arc-extinguishing chamber switch off; and because the time of the permanent magnetic mechanism once action is very short, when the arc is not effectively extinguished, the low-voltage transition vacuum arc extinguish chamber starts to perform the switching-off action, and the transformer is burnt.
Disclosure of Invention
Aiming at the problems, the invention provides the on-load capacitance-regulating switch which is good in lightning protection effect and can resist three-phase imbalance.
In order to achieve the purpose, the invention adopts the following technical scheme: a lightning protection type on-load capacitance regulating transformer comprises a low-voltage winding, a high-voltage winding and an on-load capacitance regulating switch for switching the transformer between large and small capacities, wherein when the on-load capacitance regulating switch switches the capacitance regulating transformer to be in a large capacity state, the windings adopt a Dyn11 connection mode; when the on-load capacitance regulating switch switches the capacitance regulating transformer to a small capacity, the windings adopt an Yzn11 connection mode.
Further, it includes high-voltage switching system and low-voltage switching system to have to carry the accent appearance switch, each looks of low-voltage switching system includes first parallelly connected vacuum interrupter, the parallelly connected vacuum interrupter of second, the parallelly connected vacuum interrupter of third, the vacuum interrupter of establishing ties and low pressure transition vacuum interrupter. By arranging three parallel vacuum arc-extinguishing chambers, a series vacuum arc-extinguishing chamber and a transition vacuum arc-extinguishing chamber, each vacuum arc-extinguishing chamber only needs to act once in the conversion process of the low-voltage coil; in addition, only the low-voltage transition vacuum arc-extinguishing chamber needs to be subjected to arc extinction after being switched off in the whole process, so that enough time can be given for the low-voltage transition vacuum arc-extinguishing chamber to extinguish the arc, and effective arc extinction in the capacity regulating process is effectively ensured; overall structure is simple, design benefit, and the fault rate is low, is fit for promoting.
Furthermore, the low-voltage transition vacuum arc-extinguishing chamber is connected in parallel with a transition resistor.
Furthermore, the low-voltage transition vacuum arc-extinguishing chamber is connected in series with a transition resistor.
Furthermore, when the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber and the third parallel vacuum arc-extinguishing chamber are in a closing state and the series vacuum arc-extinguishing chamber and the low-voltage transition vacuum arc-extinguishing chamber are in a breaking state, two groups of coils in each phase of the low-voltage winding of the transformer are connected in parallel; when the series vacuum arc-extinguishing chambers are in a closing state and the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber, the third parallel vacuum arc-extinguishing chamber and the low-voltage transition vacuum arc-extinguishing chamber are in an opening state, a group of coils of one phase in the low-voltage winding of the transformer and a group of coils of the other phase are in reverse series connection. According to the action time sequence, the reliable and convenient conversion of the low-voltage winding between yn connection and zn connection can be realized, effective arc extinction can be ensured in the conversion process, the arc extinction time meets the national highest standard, and the use is safe and reliable.
Preferably, each of the vacuum interrupters operates in the following sequence:
firstly, opening a low-voltage transition vacuum arc extinguish chamber;
then, switching on the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber and the third parallel vacuum arc-extinguishing chamber;
and finally, the series vacuum arc-extinguishing chamber is opened, so that the low-voltage winding of the transformer completes the conversion from zn connection to yn connection.
The invention also discloses an on-load capacitance regulating switch which has a first state and a second state and comprises a high-voltage switching system and a low-voltage switching system, wherein when the capacitance regulating switch is in the first state, a transformer winding is in a Dyn11 connection mode; when the capacitance regulating switch is in the second state, the transformer winding is in an Yzn11 connection mode.
Furthermore, each phase of the low-voltage switching system comprises a first parallel vacuum arc-extinguishing chamber, a second parallel vacuum arc-extinguishing chamber, a third parallel vacuum arc-extinguishing chamber, a series vacuum arc-extinguishing chamber and a transition vacuum arc-extinguishing chamber connected with a transition resistor in series.
Preferably, each phase of the low-voltage switching system comprises a first parallel vacuum arc-extinguishing chamber, a second parallel vacuum arc-extinguishing chamber, a third parallel vacuum arc-extinguishing chamber, a series vacuum arc-extinguishing chamber and a transition vacuum arc-extinguishing chamber connected with a transition resistor in parallel.
Furthermore, when the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber and the third parallel vacuum arc-extinguishing chamber are in a closing state and the series vacuum arc-extinguishing chamber and the low-voltage transition vacuum arc-extinguishing chamber are in a breaking state, two groups of coils in each phase of the low-voltage winding of the transformer are connected in parallel; when the series vacuum arc-extinguishing chambers are in a closing state and the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber, the third parallel vacuum arc-extinguishing chamber and the low-voltage transition vacuum arc-extinguishing chamber are in an opening state, a group of coils of one phase in the low-voltage winding of the transformer and a group of coils of the other phase are in reverse series connection.
Preferably, each of the vacuum interrupters operates in the following sequence:
firstly, switching on a low-voltage transition vacuum arc extinguish chamber;
then, uniformly opening the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber and the third parallel vacuum arc-extinguishing chamber;
then switching on the series vacuum arc-extinguishing chamber;
and finally, switching off the low-voltage transition vacuum arc extinguishing, so that the conversion from yn connection to zn connection of the transformer low-voltage winding is completed.
Each vacuum arc extinguish chamber acts according to the following time sequence:
firstly, opening a low-voltage transition vacuum arc extinguish chamber;
then, switching on the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber and the third parallel vacuum arc-extinguishing chamber;
and finally, the series vacuum arc-extinguishing chamber is opened, so that the low-voltage winding of the transformer completes the conversion from yn connection to zn connection.
In conclusion, the beneficial effects of the invention are as follows: the on-load capacity regulating transformer adopts an Yzn11 connection mode when the capacity is regulated to a small capacity state, so that the on-load capacity regulating transformer has strong capability of bearing unbalanced load and good lightning protection characteristic; according to the on-load capacitance-regulating switch, the low-voltage transition vacuum arc-extinguishing chambers and the transition resistors are connected in parallel or in series and then are connected into a circuit, so that uninterrupted operation in the capacitance-regulating process is guaranteed, and reasonable arc-extinguishing time and reliable arc-extinguishing effect are effectively guaranteed by adopting a reasonable number of vacuum arc-extinguishing chambers; the whole structure is simple, economical and energy-saving, and is suitable for popularization.
Drawings
Fig. 1 is a schematic circuit diagram of the high side winding of the present invention at low capacity.
Fig. 2 is a circuit diagram of the high-side winding of the present invention in a large capacity.
Fig. 3 is another circuit schematic of the high side winding of the present invention at low capacity.
Fig. 4 is another circuit schematic of the high side winding of the present invention in a high capacity.
Fig. 5 is a circuit schematic of the low side winding of the present invention at low capacity.
Fig. 6 is a first circuit diagram of the low-voltage side winding during capacity conversion according to the present invention.
Fig. 7 is a second circuit schematic diagram of the low-side winding during capacity conversion according to the present invention.
Fig. 8 is a circuit diagram of the low-side winding in the large capacity of the present invention.
Fig. 9 is another circuit schematic of the low side winding of the present invention at low capacity.
Fig. 10 is another circuit schematic of the low side winding of the present invention in a high capacity.
Fig. 11 is a schematic diagram of another circuit of the low side winding of the present invention in a low capacity state.
Fig. 12 is a schematic diagram of another circuit of the low side winding of the present invention in a high capacity state.
Fig. 13 is a timing chart showing the operation of each vacuum interrupter in the low-voltage side winding of the on-load capacitance-regulating switch according to the present invention.
Wherein K represents a vacuum arc-extinguishing chamber, a symbol 'day' represents that the vacuum arc-extinguishing chamber is in a closing state, and a symbol 'eye' represents that the vacuum arc-extinguishing chamber is in an opening state; r represents transition resistance; t represents time.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
A lightning protection type on-load capacity regulating transformer comprises a three-phase high-voltage winding, a three-phase low-voltage winding, an on-load capacity regulating switch and other metal and nonmetal structural members forming the transformer, wherein when the on-load capacity regulating switch switches the capacity regulating transformer to be in a high-capacity state, the windings are connected in a Dyn11 connection mode; when the on-load capacitance regulating switch switches the capacitance regulating transformer to a small capacity, the windings adopt an Yzn11 connection mode.
Specifically, the low-voltage winding of each phase includes two coils with equal turns, and the two coils are wound on the iron core in an axially symmetric distribution manner, and of course, in other embodiments, the two coils may be wound on the iron core in a radially distributed manner, or the two coils may be wound on the iron core in parallel, or the two coils may be wound in an overlapping manner and transposed;
in this embodiment, each phase of low-voltage winding includes two sections of coils, or a first coil group and a second coil group formed by combining a plurality of sections of coils, the number of turns of the two coil groups is equal, and the two coil groups are respectively wound on the iron core in an axially symmetric distribution, so that the same technical effect can be achieved.
The on-load capacitance-regulating transformer provided by the embodiment realizes Yzn11 connection mode when switching to small capacity, has stronger capability of bearing unbalanced load, namely stronger single-phase power supply capability, and is particularly suitable for places (such as rural areas and mountain areas) with difficult balance of three-phase load; and has excellent lightning protection characteristics, and is particularly suitable for lightning protection transformers in areas with high lightning or areas with high soil resistivity.
The embodiment also provides an on-load capacitance regulating switch, which is applied to the capacitance regulating transformer with the lightning protection function, wherein the on-load capacitance regulating switch has a first state and a second state, and when the capacitance regulating switch is in the first state, a winding of the transformer is in a Dyn11 connection mode; when the capacitance regulating switch is in a second state, the winding of the transformer is in Yzn11 connection mode.
Specifically, the on-load capacitance regulating switch includes a high-voltage coil switching system, a low-voltage coil switching system and a driving mechanism, and taking one phase as an example, as shown in fig. 1 and 2, the high-voltage coil switching system includes an angular vacuum arc-extinguishing chamber K2, a star-connected vacuum arc-extinguishing chamber K1 and a high-voltage transition vacuum arc-extinguishing chamber Kg connected in parallel with a transition resistor R, the angular vacuum arc-extinguishing chamber K2 makes the high-voltage coil in a triangular connection when switching on, and the star-connected vacuum arc-extinguishing chamber K1 makes the high-voltage coil in a star connection when switching on; specifically, in this embodiment, the high-voltage transition vacuum interrupter is connected in series with the angle connection vacuum interrupter; in other embodiments, the high-voltage transition vacuum interrupter may also be connected in series with the star-connected vacuum interrupter, or as shown in fig. 3 and 4, a high-voltage transition vacuum interrupter Kg is connected in series with the corner-connected vacuum interrupter K2 and the star-connected vacuum interrupter K1, respectively, and the high-voltage transition vacuum interrupter is connected in parallel with a transition resistor R.
Specifically, taking one phase as an example, as shown in fig. 5 to 8, each of the low-voltage switching systems of each phase includes a first parallel vacuum arc-extinguishing chamber Kb1, a second parallel vacuum arc-extinguishing chamber Kb2, a third parallel vacuum arc-extinguishing chamber Kb3, a series vacuum arc-extinguishing chamber Kc, and a low-voltage transition vacuum arc-extinguishing chamber Kg connected in parallel with a transition resistor R; of course, in other embodiments, the transition resistor R may be connected in series with the low-voltage transition vacuum interrupter Kg, and the transition resistor R is connected in series with the low-voltage transition vacuum interrupter Kg to form a transition branch, and the transition branch may be connected in parallel to two ends of the second parallel vacuum interrupter Kb2, as shown in fig. 9 and 10; alternatively, the transition branch may also be connected in parallel to two ends of the third parallel vacuum interrupter Kb3, as shown in fig. 11 and 12; fig. 9 and 11 show schematic circuit diagrams of each vacuum interrupter and the low-voltage coil when the capacitance-regulating transformer is in a low-capacity state; fig. 10 and 12 are schematic circuit diagrams of the vacuum interrupter and the low-voltage coil when the capacity-adjusting transformer is in a high-capacity state.
The driving mechanism comprises a set of permanent magnet mechanism and a transmission device matched with the permanent magnet mechanism, and all the vacuum arc-extinguishing chambers are driven to move in a reciprocating manner through the transmission device, so that each vacuum arc-extinguishing chamber performs opening and closing actions according to a designed time sequence, and the connection mode of each coil in a transformer winding is further changed, and the purpose of adjusting the capacity of the transformer is achieved;
specifically, as shown in fig. 5-8, the number of turns of the first-stage coil La1 of the phase a is equal to that of the second-stage coil La2, the front end of the first-stage coil La1 is connected to the first parallel vacuum arc-extinguishing chamber Kb1 and the series vacuum arc-extinguishing chamber Kc, and the rear end of the first-stage coil La1 is connected to the second parallel vacuum arc-extinguishing chamber Kb 2; the rear end of the second section of coil La2 is connected with the third parallel vacuum arc-extinguishing chamber Kb 3;
for convenience of description, in fig. 5, a node m is marked between the first-stage coil La1 and the second parallel vacuum arc-extinguishing chamber Kb2, a node n is marked between the second-stage coil La2 and the second parallel vacuum arc-extinguishing chamber Kb2, the node m of the a phase is connected to the node n of the c phase through a lead 1, the node m of the b phase is connected to the node n of the a phase through a lead 2, and the node m of the c phase is connected to the node n of the b phase through a lead 3;
therefore, when the capacity regulating transformer is in a small capacity state, the low-voltage winding is shown in fig. 5, and the high-voltage winding is shown in fig. 1:
when the transformer is in a low-capacity state, the series vacuum arc-extinguishing chamber Kc in each phase of low-voltage winding is in a closing state, and meanwhile, the first parallel vacuum arc-extinguishing chamber Kb1, the second parallel vacuum arc-extinguishing chamber Kb2, the third parallel vacuum arc-extinguishing chamber Kb3 and the low-voltage transition vacuum arc-extinguishing chamber Kg are in a switching-off state, and at the moment, one section of coil of one phase in the transformer low-voltage winding is in reverse series connection with one section of coil of the other phase; specifically, the second-stage coil La2 of the a phase is reversely connected in series with the first-stage coil Lb1 of the b phase, the second-stage coil Lb2 of the b phase is reversely connected in series with the first-stage coil Lc1 of the c phase, and the second-stage coil Lc2 of the c phase is reversely connected in series with the first-stage coil La1 of the a phase, so that the low-voltage windings of the a phase, the b phase and the c phase are connected in a zn manner.
At this time, as shown in fig. 1, in the high-voltage coil switching system of each phase, the high-voltage transition vacuum arc-extinguishing chamber Kg and the star-connected vacuum arc-extinguishing chamber K1 are in a closing state, and meanwhile, the angle-connected vacuum arc-extinguishing chamber K2 is in an opening state, and the three-phase high-voltage coils are in star connection;
when the capacity of the transformer needs to be switched to a large capacity, the permanent magnet mechanism in the capacity regulating switch moves upwards or downwards once, and the transmission device drives each vacuum arc extinguish chamber in the low-voltage coil switching system and the high-voltage coil switching system to move according to the following time sequence:
(firstly, the action process of each vacuum arc-extinguishing chamber of the low-voltage coil switching system is described, and meanwhile, the action of each vacuum arc-extinguishing chamber of the high-voltage coil switching system is performed simultaneously, and the description is later performed); at this time, each vacuum arc-extinguishing chamber of each phase in the low-voltage coil switching system operates according to the following time sequence: firstly, switching off a low-voltage transition vacuum arc-extinguishing chamber Kg, and switching on a transition resistor R, as shown in FIG. 6; after the low-voltage transition vacuum arc-extinguishing chamber Kg is extinguished, then the first parallel vacuum arc-extinguishing chamber Kb1, the second parallel vacuum arc-extinguishing chamber Kb2 and the third parallel vacuum arc-extinguishing chamber Kb3 are all switched on, as shown in fig. 7; then, switching off a series-connected vacuum arc-extinguishing chamber Kc, as shown in fig. 8, the first parallel vacuum arc-extinguishing chamber Kb1, the second parallel vacuum arc-extinguishing chamber Kb2 and the third parallel vacuum arc-extinguishing chamber Kb3 are in a switching-on state, and simultaneously, the series-connected vacuum arc-extinguishing chamber Kc and the low-voltage transition vacuum arc-extinguishing chamber Kg are in a switching-off state, and a first coil and a second coil in each phase of a low-voltage winding of the transformer are connected in parallel; the three phases are circularly connected to form a new winding, and then the three-phase windings are connected in a star connection mode to obtain yn connection of the low-voltage winding; by arranging five vacuum arc-extinguishing chambers, reliable arc-extinguishing is ensured when the low-voltage winding is converted from zn connection to yn connection under the condition of uninterrupted current, and the purpose of capacity switching is achieved.
As shown in fig. 13, it is a timing diagram of the actions of each vacuum interrupter during the switching process of the low-voltage coil switching system; specifically, the time of one action of the permanent magnetic mechanism is divided into four time periods T1-T4, when the permanent magnetic mechanism acts once, the arc extinguishing place needs to be considered in the whole process, namely the arc extinguishing chamber is switched on to switched off, and the arc generated in the process of switching off to switching on of the vacuum arc extinguishing chamber can be ignored;
specifically, at the time of T1, Kg starts to switch on and off, and Kg is used for arc extinction in the period of T1-T3; when the time of T3 is reached, Kg has enough time to achieve reliable arc extinction, i.e. the operations from opening to closing can be performed on Kb1, Kb2 and Kb3 (the arc generated in the process from opening to closing is negligible), so the time interval from T3 to T4 can be set to be short, as can be seen from the figure; after a short pause, the time T4 is reached, and the Kc is switched from closing to opening to finish the conversion. As can be seen from fig. 13, in the whole switching process, only the low-voltage transition vacuum arc-extinguishing chamber Kg needs time to extinguish the arc from closing to opening, and the operations from opening to closing performed by Kb1, Kb2, and Kb3 almost do not need time to extinguish the arc, so that most of the time can be allocated to Kg arc-extinguishing, that is, T2-T3 in fig. 13 can be set to be longer, and while effective arc-extinguishing is ensured, the arc-extinguishing time in the whole switching process is also ensured to be within a short range.
On the contrary, when the three-phase low-voltage coil needs to be converted from yn connection to zn connection, taking one phase as an example, the steps are as follows: the series vacuum arc-extinguishing chamber Kc is switched on first; then the first parallel vacuum arc-extinguishing chamber Kb1, the second parallel vacuum arc-extinguishing chamber Kb2 and the third parallel vacuum arc-extinguishing chamber Kb3 are opened; finally, switching on the low-voltage transition vacuum arc-extinguishing chamber Kg to complete conversion, and other details are not described again;
the driving mechanism drives each vacuum arc-extinguishing chamber of the low-voltage coil switching system to act and simultaneously drives each vacuum arc-extinguishing chamber in each phase of the high-voltage coil switching system to act according to the following time sequence:
firstly, switching off a high-voltage transition vacuum arc extinguish chamber Kg; then, the corner joint vacuum arc extinguish chamber K2 is switched on; then the star connection vacuum arc extinguish chamber K1 is opened; finally, switching off the high-voltage transition vacuum arc extinguishing Kg to finish the conversion; on the contrary, when the high-voltage coil is required to be converted from angular connection to star connection, the steps are opposite.
In summary, the on-load capacitance-regulating transformer of the present invention can realize: in a small-capacity state, the windings of the transformer realize an Yzn11 connection mode; when the transformer is switched to large capacity, the windings of the transformer realize a Dyn11 coupling mode.
The two-section coil structure of the low-voltage winding enables the low-voltage winding of the capacitance regulating transformer to realize the conversion from yn connection to zn connection or from zn connection to yn connection; the capacity regulating transformer adopts Yzn11 connection when the capacity is small, has stronger capability of bearing unbalanced load, namely stronger single-phase power supply capability, and is particularly suitable for places (such as rural areas and mountain areas) with three-phase load difficult to balance; meanwhile, the low-voltage side adopts a two-section coil combination, so that when the low-voltage side is switched to a small capacity, the zn connection mode of the low-voltage winding has good lightning protection property, and the transformer is particularly suitable for being used as a lightning protection transformer in a thunderstorm area or an area with high soil resistivity.
The low-voltage side winding is divided into two sections with equal turns, and the turns can be determined randomly, so that the design of the most material-saving can be selected, and the two sections of windings are easy to arrange, so that the window filling coefficient is high. These factors result in the fact that in the special case of a capacity-regulating transformer, the cost of the Yzn 11-coupled capacity-regulating transformer is lower than that of the Yyn 0-coupled.
Moreover, the capacity-regulating switch matched with the capacity-regulating switch adopts a vacuum arc-extinguishing chamber to form a high-voltage winding switching system and a low-voltage winding switching system, so that the problem of arc extinguishing on a high-voltage side and a low-voltage side is effectively solved, the capacity-regulating switch is maintenance-free and has long service life; the permanent magnet mechanism is used as a driving mechanism, the structure is simple, the reliability is high, the switching action is completed quickly, and the duration of the operation overvoltage and the duration of the voltage waveform distortion generated by switching are correspondingly shortened. In addition, in this embodiment, all vacuum interrupter are vacuum tubes with moving contact and static contact, and its reliability is high, can guarantee effectively to extinguish the arc.
In addition, the switching process of each vacuum arc-extinguishing chamber under another structure is briefly described, as shown in fig. 9, a schematic circuit diagram of the low-voltage winding side when the transformer is in a large-capacity state, and when the transformer needs to be switched to a small capacity, the driving mechanism drives each vacuum arc-extinguishing chamber to act according to the following sequence: firstly, switching on a low-voltage transition vacuum arc extinguish chamber Kg; then, the first parallel vacuum arc-extinguishing chamber Kb1, the second parallel vacuum arc-extinguishing chamber Kb2 and the third parallel vacuum arc-extinguishing chamber Kb3 are equally opened; then switching on the series vacuum arc-extinguishing chamber Kc; finally, the low-voltage transition vacuum arc extinguishing is carried out, so that the low-voltage winding completes the conversion from yn connection to zn connection, and the low-voltage winding is connected with zn as shown in figure 10.
The structures of fig. 11 and 12 are similar to those of fig. 9 and 10, and detailed switching processes are not described here.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (1)
1. An on-load capacitance-regulating switch, having a first state and a second state, comprising a high-voltage switching system and a low-voltage switching system, characterized in that: when the capacitance-regulating switch is in a first state, the transformer winding is in a Dyn11 coupling mode; when the capacitance regulating switch is in a second state, the transformer winding is in an Yzn11 connection mode;
each phase of the low-voltage switching system comprises a first parallel vacuum arc-extinguishing chamber, a second parallel vacuum arc-extinguishing chamber, a third parallel vacuum arc-extinguishing chamber, a serial vacuum arc-extinguishing chamber and a transition vacuum arc-extinguishing chamber connected with a transition resistor in parallel; when the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber and the third parallel vacuum arc-extinguishing chamber are in a closing state and the series vacuum arc-extinguishing chamber and the low-voltage transition vacuum arc-extinguishing chamber are in an opening state, two groups of coils in each phase of the low-voltage winding of the transformer are connected in parallel;
when the series vacuum arc-extinguishing chambers are in a closing state and the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber, the third parallel vacuum arc-extinguishing chamber and the low-voltage transition vacuum arc-extinguishing chamber are in an opening state, a group of coils of one phase in the low-voltage winding of the transformer and a group of coils of the other phase are in reverse series connection;
each vacuum arc extinguish chamber acts according to the following time sequence: firstly, opening a low-voltage transition vacuum arc extinguish chamber; then, switching on the first parallel vacuum arc-extinguishing chamber, the second parallel vacuum arc-extinguishing chamber and the third parallel vacuum arc-extinguishing chamber; finally, the series vacuum arc extinguish chamber is opened, so that the low-voltage winding of the transformer completes the conversion from yn connection to zn connection;
the driving mechanism comprises a set of permanent magnet mechanism and a transmission device matched with the permanent magnet mechanism;
the number of turns of the first-stage coil La1 and the second-stage coil La2 of the phase a are equal, the front end of the first-stage coil La1 is respectively connected with the first parallel vacuum arc-extinguishing chamber Kb1 and the series vacuum arc-extinguishing chamber Kc, and the rear end of the first-stage coil La1 is connected with the second parallel vacuum arc-extinguishing chamber Kb 2; the rear end of the second section of coil La2 is connected with the third parallel vacuum arc-extinguishing chamber Kb 3;
dividing the time of one-time action of the permanent magnet mechanism into four time periods T1-T4, wherein at the time of T1, Kg starts to switch on and off, and the time of T1-T3 is used for Kg to extinguish arc; and when the time T4 is reached, switching the Kc from closing to opening to finish the conversion.
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| CN201910024500.1A CN109559881B (en) | 2016-04-20 | 2017-04-20 | On-load capacity regulating switch |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4837497A (en) * | 1987-12-29 | 1989-06-06 | Gregory Leibovich | Variable transformer, reactor and method of their control |
| CN105321744A (en) * | 2015-10-26 | 2016-02-10 | 浙江宝威电气有限公司 | On-load capacity-regulating switch for transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2767996B1 (en) * | 2013-02-15 | 2017-09-27 | ABB Schweiz AG | Switching device for an on-load tap changer |
| CN109637793B (en) * | 2016-04-20 | 2020-04-10 | 浙江宝威电气有限公司 | Capacity-adjusting transformer with lightning protection function |
| CN205881723U (en) * | 2016-04-20 | 2017-01-11 | 浙江宝威电气有限公司 | Lightning protection type transfers accent that holds transformer to hold switch |
| CN205881664U (en) * | 2016-04-20 | 2017-01-11 | 浙江宝威电气有限公司 | Transfer and hold transformer with lightning protection function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4837497A (en) * | 1987-12-29 | 1989-06-06 | Gregory Leibovich | Variable transformer, reactor and method of their control |
| CN105321744A (en) * | 2015-10-26 | 2016-02-10 | 浙江宝威电气有限公司 | On-load capacity-regulating switch for transformer |
Non-Patent Citations (1)
| Title |
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| 不同接线配电变压器防雷性能浅析;李辉桃;《广东输电与变电技术》;20100630(第3期);第55页-第56页 * |
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| CN107195445A (en) | 2017-09-22 |
| CN107195445B (en) | 2019-04-12 |
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