CN202473567U - Inductance type on-load tap-changer - Google Patents
Inductance type on-load tap-changer Download PDFInfo
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- CN202473567U CN202473567U CN2012200003472U CN201220000347U CN202473567U CN 202473567 U CN202473567 U CN 202473567U CN 2012200003472 U CN2012200003472 U CN 2012200003472U CN 201220000347 U CN201220000347 U CN 201220000347U CN 202473567 U CN202473567 U CN 202473567U
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- inductance
- switch
- load tap
- power supply
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Abstract
The utility model provides an inductance type on-load tap-changer. The inductance type on-load tap-changer is applied to a power transformer and comprises two switch static contacts. Each of the switch static contacts is respectively connected with a voltage contact of an autotransformer. The two switch static contacts respectively lead out two power supply terminals. One of the two power supply terminals can be directly matched with a switch, and the other one of the two power supply terminals is connected with an inductance in series and then matched with the switch. The switch is connected with two capacitances in series and then electrically connected to a live line output end. Each of the two capacitances respectively forms a harmonic oscillator with one of the inductances. The inductance type on-load tap-changer can not only effectively switch ratio of transformation, but also effectively prevent voltage dip effect during the process of the switching, so that power supply stability is further improved.
Description
Technical field
[0001] the utility model relates to the power infrastructures field, especially, is a kind of on load tap changer that is applied to power transformer.
Background technology
[0002] in civilian supply of electric power field, adopt high-tension electricity to transmit electricity usually, so can reduce the loss of electric current on power transmission line; Near the user side place, need set up transformer station usually, high-tension electricity is carried out step-down; Thereby be met the line voltage of normal electricity consumption, i.e. 220V.
Generally, the power consumption of user side between peak and ebb, change bigger, owing to the reason of line loss; When power consumption fluctuates, the virtual voltage of user side also will change, and so, need transformer constantly to adjust transformation ratio; To stablize the virtual voltage of user side, this process is achieved through the primary coil of change transformer and the turn ratio of secondary coil, and when changing turn ratio; In order to guarantee the normal electricity consumption of user, need under the situation of interrupt load electric current not, realize the conversion of transformation ratio, in addition; Also need prevent the generation of electric arc in transformation change process, so, generally adopt on load tap changer at present to satisfy above-mentioned requirements.
The principle of present on load tap changer such as Fig. 2, shown in Figure 3, in Fig. 2, single-phase autotransformer has a zero line contact P1; A live wire input P2; Said zero line contact P1 is as the common port of input and output, and has a plurality of output voltage contacts, marks among Fig. 2 to be voltage contact W1, voltage contact W2; Can know that the output voltage between voltage contact W1 and the zero line contact P1 is greater than the output voltage between voltage contact W2 and the zero line contact P1; When needs switch output voltage, when voltage switches between W2-P1 voltage between W1-P1, only need diverter switch K is transferred to W2 (user side load connecting to neutral line contact P1 and switch terminal P3) from voltage contact W1; Yet in transfer process, diverter switch K is first to be connected with voltage contact W1, voltage contact W2 simultaneously if make, again out-off voltage contact W1; Though interrupt load electric current not; But as diverter switch K during near voltage contact W2, because electric discharge phenomena will take place in the electrical potential difference between the voltage contact W1, voltage contact W2; Produce electric arc, cause very big danger; So, as shown in Figure 2 in present on load tap changer, between the different voltages with different contact, also be provided with transition resistance R1, R2, through diverter switch K switching voltage-transformation the time, its flow process is as shown in Figure 3; Analysis can be known, presses the order of voltage contact W1, transition resistance R1, transition resistance R2, voltage contact W2, and voltage reduces successively, so, the voltage-transition effect has been arranged, and has reduced the electrical potential difference between each contact, can effectively suppress the generation of electric arc.
In Fig. 2, common on load tap changer shown in Figure 3, in the process of switching voltage-transformation ratio, because the existence of transition resistance; And in order to improve transition effect, transition resistance need adopt bigger resistance, in the case; When diverter switch K only contacts with the terminal of being drawn by transition resistance R1, R2; Because the dividing potential drop effect of transition resistance, the voltage of user load end must be lower than the voltage before the adjustment, and this will make user side in the adjustment voltage course, produce the process of a voltage collapse; This will make before the adjustment just the electrical appliance of undertension jump to stop, so this kind resistance-type on load tap changer exists obvious defects.
Summary of the invention
In order to address the above problem; The purpose of the utility model is to provide a kind of inductance type on load tap changer; This kind on load tap changer is effective switching voltage-transformation ratio not only, and in handoff procedure, can effectively avoid the voltage collapse phenomenon, has further improved power supply stability.
The utility model solves the technical scheme that its technical problem adopted: this inductance type on load tap changer comprises two switch fixed contacts, and each said switch fixed contact links with a voltage contact of autotransformer respectively; Described two switch fixed contacts are drawn two power supply terminals respectively, and one in these two power supply terminals can directly cooperate with diverter switch, cooperate with said diverter switch behind inductance of another serial connection; Be electrically connected to the live wire output behind two electric capacity of said diverter switch serial connection; Said two electric capacity constitute harmonic oscillator with a said inductance respectively.
As preferably; Said inductance is a controllable impedance, and said electric capacity is tunable capacitor, thereby when making said switch fixed contact be in the free voltage contact of autotransformer; Scalable is by the induction reactance in the said harmonic oscillator, to satisfy that each said power supply terminal boosts gradually or the effect of step-down gradually.
As preferably, said inductance and electric capacity are regulated by the controller Synchronization Control, thereby guarantee that the series connection that is made up of said inductance and electric capacity constitutes harmonic oscillator all the time.
The beneficial effect of the utility model is: this inductance type on load tap changer is in the process of switching transformer transformation ratio, according to the flow operations identical with common on load tap changer, so; Because the induction reactance effect of said inductance, can between said power supply terminal, form and common on load tap changer in the transient voltage of transition resistance same effect, and when said inductance communicates with said electric capacity through said diverter switch; Will form one or two harmonic oscillators; Said harmonic oscillator can be ignored for the impedance of entire circuit, for the electric capacity that does not constitute harmonic oscillator, because its capacitive reactance to alternating current comparatively limited again (the logical resistance direct current that exchanges of electric capacity); Therefore; Adopt this transition system switching voltage-transformation than the time, very limited to the step-down of user load end, can effectively avoid the voltage collapse phenomenon.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model inductance type on load tap changer;
Fig. 2 is the electrical block diagram of common on load tap changer;
Fig. 3 is the operational flowchart of common on load tap changer in conversion transformation ratio process.
Among the figure: W1, W2, voltage contact; K, diverter switch; C1, C2, electric capacity; L1, L2, inductance.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified:
In the embodiment shown in fig. 1, this inductance type on load tap changer comprises two switch fixed contacts, and each said switch fixed contact links with voltage contact W1, a W2 of autotransformer respectively; Described two switch fixed contacts are drawn two power supply terminals respectively, and one in these two power supply terminals can directly cooperate with diverter switch K, cooperate with said diverter switch K behind inductance L 1 of another serial connection, the L2; Be electrically connected to live wire output P3 after said diverter switch K serial connection capacitor C 1 and the capacitor C 2; Said capacitor C 1 constitutes harmonic oscillator with said inductance L 1, i.e. the induction reactance that the capacitive reactance of capacitor C 1 equals inductance L 1 equates that said capacitor C 2 constitutes harmonic oscillator with said inductance L 2, i.e. the induction reactance that the capacitive reactance of capacitor C 2 equals inductance L 2 equates.
Said inductance L 1, L2 are controllable impedance; And said capacitor C 1, C2 are tunable capacitor, thereby when making said switch fixed contact be in the free voltage contact of autotransformer, scalable is by the induction reactance in the said harmonic oscillator; To satisfy that each said power supply terminal boosts gradually or the effect of step-down gradually; As, when the transformation ratio drop of required adjusting is big, then can suitably transfer the induction reactance of big said inductance L 1, L2; In addition, said inductance L 1, L2 and capacitor C 1, C2 regulate by the controller Synchronization Control, thereby guarantee that the series connection that is made up of said inductance and electric capacity constitutes harmonic oscillator all the time.
Above-mentioned inductance type on load tap changer is in the process of switching transformer transformation ratio, according to the flow operations identical with common on load tap changer, so; Because the induction reactance effect of said inductance L 1, L2, can between said power supply terminal, form and common on load tap changer in the transient voltage of transition resistance same effect, and when said inductance L 1, L2 through said diverter switch K with said capacitor C 1, when C2 communicates; Will form one or two harmonic oscillators (when diverter switch K contacts with the pairing respectively power supply terminal of inductance L 1, L2 simultaneously; Form two harmonic oscillators, otherwise be a harmonic oscillator), said harmonic oscillator can be ignored for the impedance of entire circuit; For the electric capacity that does not constitute harmonic oscillator; Since its capacitive reactance comparatively limited again (the logical resistance direct current that exchanges of electric capacity) to alternating current, therefore, when adopting this transition system switching voltage-transformation to compare; Step-down to the user load end is very limited, can effectively avoid the voltage collapse phenomenon.
The above is merely the preferred embodiment of the utility model, and is in order to restriction the utility model, not all within the spirit and principle of the utility model, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (1)
1. an inductance type on load tap changer comprises two switch fixed contacts, and each said switch fixed contact links with the voltage contact (W1, W2) of autotransformer respectively; Described two switch fixed contacts are drawn two power supply terminals respectively, it is characterized in that: one in these two power supply terminals can directly cooperate with diverter switch (K), cooperates with said diverter switch behind inductance of another serial connection; Be electrically connected to the live wire output behind said diverter switch (K) two electric capacity of serial connection (C1, C2); Said two electric capacity (C1, C2) constitute harmonic oscillator with a said inductance respectively.
2. inductance type on load tap changer according to claim 1 is characterized in that: said inductance (L1, L2) is a controllable impedance, and said electric capacity (C1, C2) is tunable capacitor.
3. inductance type on load tap changer according to claim 2 is characterized in that: said inductance (L1, L2) and electric capacity (C1, C2) are regulated by the controller Synchronization Control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200003472U CN202473567U (en) | 2012-01-04 | 2012-01-04 | Inductance type on-load tap-changer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200003472U CN202473567U (en) | 2012-01-04 | 2012-01-04 | Inductance type on-load tap-changer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202473567U true CN202473567U (en) | 2012-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200003472U Expired - Fee Related CN202473567U (en) | 2012-01-04 | 2012-01-04 | Inductance type on-load tap-changer |
Country Status (1)
| Country | Link |
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| CN (1) | CN202473567U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723183A (en) * | 2012-01-04 | 2012-10-10 | 吴江市东泰电力特种开关有限公司 | Inductance type on-load tap-changer |
-
2012
- 2012-01-04 CN CN2012200003472U patent/CN202473567U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723183A (en) * | 2012-01-04 | 2012-10-10 | 吴江市东泰电力特种开关有限公司 | Inductance type on-load tap-changer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20130104 |