CN105826060A - Modulating capacity transformer with three-phase imbalance resistance - Google Patents
Modulating capacity transformer with three-phase imbalance resistance Download PDFInfo
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- CN105826060A CN105826060A CN201610248701.6A CN201610248701A CN105826060A CN 105826060 A CN105826060 A CN 105826060A CN 201610248701 A CN201610248701 A CN 201610248701A CN 105826060 A CN105826060 A CN 105826060A
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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
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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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
- H01F2027/2838—Wires using transposed wires
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The invention discloses a modulating capacity transformer with three-phase imbalance resistance. The transformer comprises three phases of low-voltage windings, wherein each phase of low-voltage winding comprises a first coil assembly and a second assembly having equal turns. According to the low-voltage windings of the modulating capacity transformer, a traditional three-section winding mode is broken through, only two groups of coils having equal turns is adopted to wind, and with the structure, Yzn11 connection of the modulating capacity transformer can be adopted in small capacity. The connection mode has a relatively strong capability of bearing imbalance loading, namely relatively strong single-phase power supply capability, which is particularly suitable for places, such as rural areas and mountain areas with difficulty in three-phase loading balance. Furthermore, two groups of turns are equal, and can be determined arbitrarily, so that a design for saving most materials can be selected, and two groups of windings are easily distributed to guarantee a high window filling coefficient.
Description
Technical field
The invention belongs to power industry technical field of transformer equipment, particularly relate to the capacitance-adjustable transformer of a kind of anti-three-phase imbalance.
Background technology
Loaded capacity-regulated transformer is a kind of transformator with two kinds of rated capacities of size, according to payload, utilize corresponding capacitance switch to carry out the connected mode of switching transformer winding in the case of not cutting off the electricity supply, then realize transformator switching between two kinds of different capabilities.
At present, loaded capacity-regulated transformer is commonplace, and to use high-pressure side winding be the structure that D-Y changes, low-pressure side winding is parallel-serial conversion, and the parallel-serial conversion of low-pressure side winding needs low pressure winding to be divided into three sections, the capacitance-adjustable transformer of this syllogic low pressure winding uses Yyn0 to connect when low capacity, and along with single-phase electric devices power is increasing, quantity gets more and more, when the factors such as temporary electricity, line fault and seasonal electricity consumption cause distribution transformer three-phase load unbalance, Yyn0 connection can cause problems with: (1) increases line loss and transformer loss；(2) reduce transformator to exert oneself；(3) neutral point produces displacement, phase voltage or be increased to line voltage, burns out electrical equipment；(4) transformer outlet voltage is unbalanced, and user side three-phase voltage deviation is relatively big, and quality of voltage can not be guaranteed；(5) produce harmonic voltage and pollute electrical network.
Summary of the invention
For the problems referred to above, the present invention provides the capacitance-adjustable transformer of a kind of structurally simple, economical energy-conservation anti-three-phase imbalance.
To achieve these goals, the present invention is by the following technical solutions: the capacitance-adjustable transformer of a kind of anti-three-phase imbalance, including three-phase low-voltage winding, described every phase low pressure winding includes first coil group and second coil groups of equal turn numbers.The low pressure winding of capacitance-adjustable transformer of the present invention breaches traditional syllogic winding method, coil only with two groups of equal turn numbers carries out coiling, this structure makes capacitance-adjustable transformer use Yzn11 connection when may be implemented in low capacity, this bind mode has the stronger ability bearing unbalanced load, i.e. having stronger single phase power supply ability, this place (such as rural area and mountain area) being difficult to balance for threephase load is particularly suitable；Furthermore, two groups of equal turn numbers, so the number of turn can arbitrarily determine, therefore, it is possible to select the design of material saving, and two groups of windings are easily arranged and are made window activity coefficient high.
As preferably, described first coil group and the second coil groups are made up of one section of coil respectively, the equal turn numbers of two sections of coils.
Further, when being in Large Copacity state, described winding uses Dyn11 bind mode；When switching to low capacity, described winding uses Yzn11 bind mode.
Described first coil group and the second coil groups are that axially symmetric distribution or width are to distribution coiling.
Or further, described first coil group and the second coil groups are parallel side-by-side coiling or overlapping coiling and replace.
Capacitance-adjustable transformer of the present invention uses Yzn11 to connect when low capacity, has the stronger ability bearing unbalanced load, i.e. has stronger single phase power supply ability, and this place (such as rural area and mountain area) being difficult to balance for threephase load is particularly suitable；And there is good anti-lightning strike characteristic, it is particularly suitable for the area high in multi-thunder area or soil resistivity and is used as lightning protection transformer.
It is said that in general, common transformer Yzn11 connection cost can than Yyn0 connection high, but capacitance-adjustable transformer this in particular cases, Yyn0 connection low-pressure side winding be use and string structure, i.e. low pressure winding is divided into three sections；The process rounded up must be made when determining this three sections of umber of turns, this causes the most small number of number of turn could meet the error requirements of voltage ratio, and these numbers of turn meeting voltage ratio error requirements are not material saving, thus obtained capacitance-adjustable transformer is uneconomic；For transformer manufacturing angle, it is divided into the winding of three sections and is not easy to sequence in arrangement, make window activity coefficient the highest；
And by the design of the low pressure winding of two-part, it is achieved that capacity transfer transformation winding uses Yzn11 connection, and the number of turn of its low-pressure side winding can arbitrarily determine, therefore, it is possible to select the design of material saving, and two groups of windings easily sequence and make window activity coefficient high；These factors cause capacitance-adjustable transformer this in particular cases, use Yzn11 connection capacitance-adjustable transformer cost on the contrary than Yyn0 connection low.
In sum, the invention has the beneficial effects as follows: the present invention designs ingenious, by the low pressure winding of two groups of formulas, it is achieved that the Yzn11 bind mode of capacitance-adjustable transformer；While economical and energy saving, there is the effect of effective anti-three-phase imbalance and reliable lightning protection effect.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the capacitance switch of the present invention high-pressure side winding when transformator is in low capacity.
Fig. 2 is the circuit diagram of the capacitance switch of the present invention high-pressure side winding when transformator is in Large Copacity.
Fig. 3 is the circuit diagram of the capacitance switch of the another kind structure of the present invention high-pressure side winding when transformator is in low capacity.
Fig. 4 is the circuit diagram of the capacitance switch of the another kind structure of the present invention high-pressure side winding when transformator is in Large Copacity.
Fig. 5 is the circuit diagram of the capacitance switch of the present invention low-pressure side winding when transformator is in low capacity.
Fig. 6 is the circuit diagram of the capacitance switch of present invention low-pressure side winding in transformer capacity transformation process.
Fig. 7 is the circuit diagram of the capacitance switch of present invention low-pressure side winding in transformer capacity transformation process.
Fig. 8 is the circuit diagram of the capacitance switch of the present invention low-pressure side winding when transformator is in Large Copacity.
Fig. 9 is the circuit diagram of the capacitance switch of the another kind structure of the present invention low-pressure side winding when transformator is in low capacity.
Figure 10 is the circuit diagram of the capacitance switch of the another kind structure of the present invention low-pressure side winding when transformator is in Large Copacity.
Figure 11 is the circuit diagram of the capacitance switch of the yet another construction of the present invention low-pressure side winding when transformator is in low capacity.
Figure 12 is the circuit diagram of the capacitance switch of the yet another construction of the present invention low-pressure side winding when transformator is in Large Copacity.
Figure 13 is the action timing diagram of each vacuum interrupter in the low-pressure side winding of the capacitance switch of the present invention.
Wherein, K represents vacuum interrupter, symbol "Day" represent that vacuum interrupter is in "on" position, symbol "Mesh" represent that vacuum interrupter is in gate-dividing state；R represents transition resistance；T express time.
Detailed description of the invention
In order to make those skilled in the art be better understood from the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete description.
The capacitance-adjustable transformer of a kind of anti-three-phase imbalance, including three-phase high-voltage winding, three-phase low-voltage winding, loaded capacity-regulated switch and other metals and the nonmetal structure part constituting transformator；
The low pressure winding of each phase includes two sections of coils of equal turn numbers, these two sections of coils are wound on iron core by axially symmetric distribution, certainly, in other embodiments, can also be that two sections of coil width are wound on iron core to distribution, or two sections of coil parallel side-by-side are wound on iron core, or it are two sections of coil overlap coilings and replace；
In the present embodiment, each phase low pressure winding includes two sections of coils, it is also possible to be to use the first coil group and the second coil groups, the equal turn numbers of two groups of coil groups having multistage coil to combine, the most axially symmetric distribution is wound on iron core, also can reach same technique effect；
Described loaded capacity-regulated switch includes high-tension coil switched system, low-voltage coil switched system and drive mechanism, as a example by a phase, in each phase, as shown in Figure 1, 2, described high-tension coil switched system includes that corner connection vacuum interrupter K2, star meet vacuum interrupter K1 and be parallel with the high pressure transition vacuum interrupter Kg of transition resistance R, described corner connection vacuum interrupter K2 makes high-tension coil have a generally triangular shape when closing a floodgate, and connection, star meet vacuum interrupter K1 and make high-tension coil present star connection when closing a floodgate；Concrete, in the present embodiment, described high pressure transition vacuum interrupter is connected in series with described corner connection vacuum interrupter；In other embodiments, this high pressure transition vacuum interrupter can also connect vacuum interrupter with star and be connected in series, or as shown in Figure 3,4, meet vacuum interrupter K1 at corner connection vacuum interrupter K2 and star to connect respectively a high pressure transition vacuum interrupter Kg, and this high pressure transition vacuum interrupter is all connected in parallel to a transition resistance R.
Concrete, as a example by a phase, as viewed in figures 5-8, low pressure switched system described in each phase includes the first parallel connection vacuum arc extinguishing chamber Kb1, the second parallel connection vacuum arc extinguishing chamber Kb2, the 3rd parallel connection vacuum arc extinguishing chamber Kb3, series connection vacuum interrupter Kc, is parallel with the low pressure transition vacuum interrupter Kg of transition resistance R；Certainly, in other embodiments, can also be that transition resistance R is connected in series with described low pressure transition vacuum interrupter Kg, transition resistance R is connected serially to described low pressure transition vacuum interrupter Kg to constitute transition branch road, this transition branch road can be connected in parallel on the two ends of the second parallel connection vacuum arc extinguishing chamber Kb2, such as Fig. 9, shown in 10；Or, it is also possible to by this transition branch circuit parallel connection at the two ends of the 3rd parallel connection vacuum arc extinguishing chamber Kb3, as shown in Figure 11,12；Wherein, Fig. 9, shown in 11 time, capacitance-adjustable transformer is in low capacity state；Figure 10, shown in 12 time, capacitance-adjustable transformer be in Large Copacity state.
Described drive mechanism includes a set of permanent magnet mechanism and the actuating device coordinated with this permanent magnet mechanism, all of vacuum interrupter action is back and forth driven by this actuating device, each vacuum interrupter is made to carry out separating brake and feed motion by the sequential designed, and then each coil connected mode in change Transformer Winding, to reach to regulate the purpose of transformer capacity；
Concrete handoff procedure the present embodiment of Fig. 9-12 just repeats no more, the handoff procedure of state shown in main elaboration figure below 5-8, concrete, the equal turn numbers of the first paragraph coil La1 and second segment coil La2 of a phase, the front end of first paragraph coil La1 is connected with the first described parallel connection vacuum arc extinguishing chamber Kb1, series connection vacuum interrupter Kc respectively, the second parallel connection vacuum arc extinguishing chamber Kb2 described in the connection of rear end of first paragraph coil La1；The 3rd parallel connection vacuum arc extinguishing chamber Kb3 described in the connection of rear end of second segment coil La2；
In order to express easily, it is labeled as node m by first paragraph coil La1 in Fig. 5 and between the second parallel connection vacuum arc extinguishing chamber Kb2, node n will be labeled as between second segment coil La2 and the second parallel connection vacuum arc extinguishing chamber Kb2, by wire 1, the node m of a phase is connected to the node n of c phase, by wire 2, the node m of b phase is connected to the node n of a phase, by wire 3, the node m of c phase is connected to the node n of b phase；
So, when capacitance-adjustable transformer is in low capacity state, low pressure winding is with reference to shown in Fig. 5, and high pressure winding is with reference to shown in Fig. 1:
During low capacity state, series connection vacuum interrupter Kc in each phase low pressure winding is in "on" position, first parallel connection vacuum arc extinguishing chamber Kb1, the second parallel connection vacuum arc extinguishing chamber Kb2, the 3rd parallel connection vacuum arc extinguishing chamber Kb3 and low pressure transition vacuum interrupter Kg are in gate-dividing state simultaneously, and now in transformer low voltage winding, one section of coil of a certain phase presents differential concatenation with one section of coil of an other phase and is connected；Concrete, the second segment coil La2 of a phase reversely concatenates the first paragraph coil Lb1 of b phase, the second segment coil Lb2 of b phase reversely concatenates the first paragraph coil Lc1 of c phase, and the second segment coil Lc2 of c phase reversely concatenates the first paragraph coil La1 of a phase, makes the low pressure winding of a, b, c three-phase present zn connection.
And now, as it is shown in figure 1, the high-tension coil switched system mesohigh transition vacuum interrupter Kg of each phase and star meet vacuum interrupter K1 and be in "on" position, corner connection vacuum interrupter K2 is in gate-dividing state simultaneously, three-phase high voltage coil is star connection；
When needing the capacity of switching transformer to Large Copacity, once, actuating device drives each vacuum interrupter in low-voltage coil switched system and high-tension coil switched system to carry out action according to following sequential to the action up or down of the permanent magnet mechanism in capacitance switch:
(first describing the course of action of each vacuum interrupter of low-voltage coil switched system, meanwhile, the action of each vacuum interrupter of high-tension coil switched system is carried out simultaneously, is described further after a while)；Now, in low-voltage coil switched system, each vacuum interrupter of each phase will carry out action according to following sequential: first by low pressure transition vacuum interrupter Kg separating brake, and transition resistance R connects, as shown in Figure 6；When after low pressure transition vacuum interrupter Kg arc extinguishing, then the first parallel connection vacuum arc extinguishing chamber Kb1, the second parallel connection vacuum arc extinguishing chamber Kb2, the 3rd parallel connection vacuum arc extinguishing chamber Kb3 are all closed a floodgate, as shown in Figure 7；Then by series connection vacuum interrupter Kc separating brake, as shown in Figure 8, described first parallel connection vacuum arc extinguishing chamber Kb1, the second parallel connection vacuum arc extinguishing chamber Kb2, the 3rd parallel connection vacuum arc extinguishing chamber Kb3 are in "on" position, the most described series connection vacuum interrupter Kc and low pressure transition vacuum interrupter Kg is in gate-dividing state, and first paragraph coil in each phase of transformer low voltage winding and second segment coil present and be connected in parallel；Three-phase the most so circulates and connects the winding that composition is new, then by star connection mode, three-phase windings is connect, and i.e. obtains the yn connection of low pressure winding；By arranging five vacuum interrupters, it is ensured that low pressure winding is attached to by zn during the conversion of yn connection reliably imitate arc extinguishing under uninterrupted current conditions, reaches the purpose of switching capacity.
As shown in figure 13, for low-voltage coil switched system action timing diagram of each vacuum interrupter in handoff procedure；Concrete, the permanent magnet mechanism action time once is divided into tetra-time periods of T1-T4, and during the every action of permanent magnet mechanism one time, need during whole to consider the place of arc extinguishing i.e. vacuum interrupter by close a floodgate separating brake when, vacuum interrupter is the most negligible to the arc of generation during closing a floodgate by separating brake；
Concrete, when being in T1 moment, Kg starts by closing a floodgate to separating brake, and T1-T3 the most then confession Kg carries out arc extinguishing；When arriving T3 moment, Kg has had sufficient time to realize reliable arc extinguishing, Kb1, Kb2, Kb3 can be carried out by separating brake to close a floodgate operation, (and separating brake to close a floodgate during generation arc negligible), so it is the shortest that the time interval of T3-T4 can be arranged, from figure；After minibreak, arrive the T4 moment, by Kc by the separating brake that closes a floodgate, complete conversion.As shown in Figure 13, in whole transformation process, only required time for arc extinguishing at low pressure transition vacuum interrupter Kg by the separating brake that closes a floodgate, and Kb1, Kb2, Kb3 are carried out by separating brake to the operation closed a floodgate with little need for time arc extinguishing, so the most of the time can be distributed to Kg arc extinguishing by us, it is longer that T2-T3 in i.e. Figure 13 can be arranged, while ensure that effective arc extinguishing, it is ensured that the quenching time of whole handoff procedure is in the shortest scope.
Otherwise, when three-phase low-voltage coil is converted to zn connection by yn connection by needs, as a example by a phase, step is specific as follows: series connection vacuum interrupter Kc first closes a floodgate；Then the first parallel connection vacuum arc extinguishing chamber Kb1, the second parallel connection vacuum arc extinguishing chamber Kb2, the 3rd parallel connection vacuum arc extinguishing chamber Kb3 separating brake；Last low pressure transition vacuum interrupter Kg closes a floodgate, and completes conversion, and other details repeat no more；
Drive mechanism is driving while each vacuum interrupter action of low-voltage coil switched system, also drives in each phase of high-tension coil switched system each vacuum interrupter and carries out action according to following sequential:
First high pressure transition vacuum interrupter Kg separating brake；Then corner connection vacuum interrupter K2 is closed a floodgate；Then star is connect vacuum interrupter K1 separating brake；Finally by high pressure transition vacuum extinction Kg separating brake, complete conversion；Otherwise, when needs high-tension coil by corner connection be converted to star connect time, step is contrary.
In sum, when this capacitance-adjustable transformer is in low capacity state, described winding uses Yzn11 bind mode；When switching to Large Copacity, described winding uses Dyn11 bind mode.
First, the two-part loop construction of low pressure winding so that the low pressure winding of capacitance-adjustable transformer achieves and is attached to zn connection by yn or is attached to the transformation of yn connection by zn；Using Yzn11 connection during capacitance-adjustable transformer low capacity, have the stronger ability bearing unbalanced load, i.e. have stronger single phase power supply ability, this place (such as rural area and mountain area) being difficult to balance for threephase load is particularly suitable；Meanwhile, low-pressure side uses two-part coil combination, it is achieved that when switching to low capacity, the zn bind mode of low pressure winding has good anti-lightning strike characteristic, is particularly suitable for the area high in multi-thunder area or soil resistivity and is used as lightning protection transformer.
The low-pressure side winding of the present invention is divided into two sections of equal turn numbers, and the number of turn can arbitrarily determine, therefore, it is possible to select the design of material saving, and two sections of windings easily sequence and make window activity coefficient high.These factors cause capacitance-adjustable transformer this in particular cases, Yzn11 connection capacitance-adjustable transformer cost on the contrary than Yyn0 connection low.
Furthermore, the capacitance switch adaptive with the present invention uses vacuum interrupter composition high pressure winding switched system and low pressure winding switched system, efficiently solves the arc extinguishing problem of high-pressure side and low-pressure side, and non-maintaining, the life-span is long；With permanent magnet mechanism as drive mechanism, simple in construction, reliability is high, and switching action completes rapidly, switching the persistent period of the switching overvoltage produced and the persistent period of voltage waveform distortion the most correspondingly shorten.It addition, in the present embodiment, all of vacuum interrupter is the vacuum tube with dynamic and static contact, its reliability is high, can guarantee that and effectively carries out arc extinguishing.
Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, all should belong to the scope of protection of the invention.
Claims (5)
1. a capacitance-adjustable transformer for anti-three-phase imbalance, including three-phase low-voltage winding, it is characterised in that: described every phase low pressure winding includes first coil group and second coil groups of equal turn numbers.
The capacitance-adjustable transformer of a kind of anti-three-phase imbalance the most according to claim 1, it is characterised in that: described first coil group and the second coil groups are made up of one section of coil respectively, the equal turn numbers of two sections of coils.
The capacitance-adjustable transformer of a kind of anti-three-phase imbalance the most according to claim 1 and 2, it is characterised in that: when being in Large Copacity state, described winding uses Dyn11 bind mode；When switching to low capacity, described winding uses Yzn11 bind mode.
The capacitance-adjustable transformer of a kind of anti-three-phase imbalance the most according to claim 1, it is characterised in that: described first coil group and the second coil groups are that axially symmetric distribution or width are to distribution coiling.
The capacitance-adjustable transformer of a kind of anti-three-phase imbalance the most according to claim 1, it is characterised in that: described first coil group and the second coil groups are parallel side-by-side coiling or overlapping coiling and replace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610248701.6A CN105826060B (en) | 2016-04-20 | 2016-04-20 | Anti unbalanced three-phase's accent holds transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610248701.6A CN105826060B (en) | 2016-04-20 | 2016-04-20 | Anti unbalanced three-phase's accent holds transformer |
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| CN105826060B CN105826060B (en) | 2020-08-28 |
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| CN2074492U (en) * | 1990-09-08 | 1991-04-03 | 盐城供电局 | Double capacity transformer |
| CN2109622U (en) * | 1991-11-06 | 1992-07-08 | 山东省茌平县轻工机械厂 | On-load automatic capacity adjusting transformer |
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| CN101800119A (en) * | 2010-04-08 | 2010-08-11 | 李景禄 | Lightning resistant distribution transformer |
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| CN205723126U (en) * | 2016-04-20 | 2016-11-23 | 浙江宝威电气有限公司 | The capacitance-adjustable transformer of anti-three-phase imbalance |
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2016
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| CN2074492U (en) * | 1990-09-08 | 1991-04-03 | 盐城供电局 | Double capacity transformer |
| CN2109622U (en) * | 1991-11-06 | 1992-07-08 | 山东省茌平县轻工机械厂 | On-load automatic capacity adjusting transformer |
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