CN204230109U - A kind of vacuum type on load tap changer transition circuit - Google Patents
A kind of vacuum type on load tap changer transition circuit Download PDFInfo
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- CN204230109U CN204230109U CN201420792348.4U CN201420792348U CN204230109U CN 204230109 U CN204230109 U CN 204230109U CN 201420792348 U CN201420792348 U CN 201420792348U CN 204230109 U CN204230109 U CN 204230109U
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- 230000007704 transition Effects 0.000 title claims abstract description 95
- 230000008859 change Effects 0.000 claims abstract description 54
- 238000004804 winding Methods 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 11
- 238000010891 electric arc Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 7
- 230000008033 biological extinction Effects 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000000746 purification Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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Abstract
The utility model provides a kind of vacuum type on load tap changer transition circuit, comprises main contact A, main contact B, vacuum contact A and vacuum contact B (serving as main switching contact and transition contact in turn), change over switch T
1and T
2, transition resistance R
1and R
2; The odd number of points of main contact A and transformer regulating winding connects in succession, and main contact B is connected with the even number tap of transformer regulating winding; Change over switch comprises the first fixed contact, the second fixed contact and moving contact; First fixed contact is connected with transformer regulating winding tap, and the second fixed contact is connected with transformer regulating winding tap by transition resistance, and one end of moving contact is connected with vacuum contact.Compared with prior art, a kind of vacuum type on load tap changer transition circuit that the utility model provides and method of operation, the task switching of main switching contact and transition contact is served as in turn by two-way vacuum tube, makes two-way vacuum contact scaling loss completely the same, greatly improves whole switching electrical life-span.
Description
Technical field
The present invention relates to a kind of shunting switch transition circuit, be specifically related to a kind of vacuum type on load tap changer transition circuit.
Background technology
On load tap changer a kind ofly provides the switching device of constant voltage when load variations for transformer.Its general principle be when ensure not interrupt load electric current, realize the switching in Transformer Winding between tap, thus change the number of turn of winding, i.e. the voltage ratio of transformer, finally realizes the object of pressure regulation.The on load tap changer configured at the transformer of rectification, smelting, rail traction is at present mostly that Quick resistance switches, and the principle of arc extinction is carried out work by arcing contact system when current zero-crossing point.The contact burning that this switching principle switches shunting switch frequently for transformer work is especially relatively more serious, and the failure rate of switch is higher, and the carbonization speed of oil is fast, adds regular maintenance amount thus to power supply department.Vacuum type on load tap changer, the main vacuum tube by diverter switch realizes arc extinction, and electric arc and hot gases do not expose; The oil of tap switch oil indoor can not carbonization and pollution, and oil does not need purification; In vacuum tube, the scaling loss corrosion of contact can drop to bottom line.On load tap changer is formed primarily of diverter switch, change over selector and motor drive mechanism.
On load tap changer bringing onto load switches, and need transition circuit and selection circuit, different voltage regulating modes requires different regulating circuits, therefore, the circuit of on load tap changer by transition circuit, selection circuit and regulating circuit three part form.Transition circuit is the series resistor circuit be connected across between tapping point, and the mechanism corresponding with it is diverter switch or selector switch, and it is the tap of electriferous state down conversion Transformer Winding.Shunting switch adopts the principle of transition circuit to realize tap change operation.There are single resistance, two resistance, four resistance or many resistance excessive by the number of its transition circuit resistance, have single break, double-fracture etc. by its contact fracture, formation capable of being combined transition circuit miscellaneous.Transition circuit and the contact task of changeover program to diverter switch have Different Effects, and can electric arc limit reliable in initial half cycle extinguishing, depends on required task switching to a great extent.
The arc contact not connecing transition resistance on load tap changer is main switching contact, and what it bore main switching contact cut-offs task; The arc contact being connected to transition resistance is transition contact, and what it bore transition contact cut-offs task.Because both cut-off the different of task, often cause contact burning to differ greatly, the situation that a contact burning is slight and another contact allows scaling loss thickness to burnout often can occur.Therefore, need to provide a kind of ensure main switching contact and transition contact scaling loss completely the same, improve the transition circuit of the electrical endurance of whole vacuum on-load operation switch.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of vacuum type on load tap changer transition circuit, described transition circuit comprises main contact A, main contact B, vacuum contact A, vacuum contact B, change over switch T
1, change over switch T
2, transition resistance R
1with transition resistance R
2;
The odd number of points of described main contact A and transformer regulating winding connects in succession, and main contact B is connected with the even number tap of transformer regulating winding;
Described change over switch T
1comprise the first fixed contact, the second fixed contact and moving contact; Described first fixed contact and described odd number of points connect in succession, and described second fixed contact is by transition resistance R
1be connected with described even number tap, one end of described moving contact is connected with vacuum contact A, the other end and the first fixed contact, and the second fixed contact is slidably connected;
Described change over switch T
2comprise the first fixed contact, the second fixed contact and moving contact; Described first fixed contact is by transition resistance R
2connect in succession with described odd number of points, described second fixed contact is connected with described even number tap; One end of described moving contact is connected with vacuum contact B, the other end and the first fixed contact, and the second fixed contact is slidably connected.
Preferably, described vacuum contact A and vacuum contact B includes the vacuum contact of two series connection; Described transition resistance R
1with transition resistance R
2resistance identical;
Preferably, described main contact A, main contact B, vacuum contact A are all connected with transformer neutral point with the other end of vacuum contact B, with output load current.
Compared with immediate prior art, excellent effect of the present invention is:
1, a kind of vacuum type on load tap changer transition circuit provided by the invention, the recovery voltage of each fracture is only the half of the recovery voltage of single break, effectively can reduce the recovery voltage between contact fracture.
2, a kind of vacuum type on load tap changer transition circuit provided by the invention, series connection double-fracture is by identical operating current, and on two vacuum contacts, scaling loss is substantially identical.
3, a kind of vacuum type on load tap changer transition circuit provided by the invention, the task switching of the main switching contact of on load tap changer diverter switch and transition contact is served as in turn by two-way vacuum tube, changeover program is symmetrical, make two-way vacuum contact scaling loss completely the same, greatly improve whole switching electrical life-span.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1: vacuum type on load tap changer transition circuit transition diagram A in the embodiment of the present invention;
Fig. 2: vacuum type on load tap changer transition circuit transition diagram B in the embodiment of the present invention;
Fig. 3: vacuum type on load tap changer transition circuit transition diagram C in the embodiment of the present invention;
Fig. 4: vacuum type on load tap changer transition circuit transition diagram D in the embodiment of the present invention;
Fig. 5: vacuum type on load tap changer transition circuit transition diagram E in the embodiment of the present invention;
Fig. 6: vacuum type on load tap changer transition circuit transition diagram F in the embodiment of the present invention;
Fig. 7: vacuum type on load tap changer transition circuit transition diagram G in the embodiment of the present invention;
Fig. 8: vacuum type on load tap changer transition circuit transition diagram H in the embodiment of the present invention;
Fig. 9: vacuum type on load tap changer transition circuit transition diagram I in the embodiment of the present invention;
Figure 10: vacuum type on load tap changer transition circuit transition diagram J in the embodiment of the present invention;
Figure 11: vacuum type on load tap changer transition circuit transition diagram K in the embodiment of the present invention;
Wherein, 101-change over switch T
1the first fixed contact; 102-change over switch T
1the second fixed contact; 103-change over switch T
1moving contact; 201-change over switch T
2the first fixed contact; 202-change over switch T
2the second fixed contact; 203-change over switch T
2moving contact.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The vacuum type on load tap changer transition circuit that the present invention proposes adopts the two resistor transition principle of series connection duplex tube, the task switching of main switching contact and transition contact is served as in turn by two-way vacuum tube, while guarantee changeover program symmetry, make the contact burning of two-way vacuum tube completely the same.
One, the structure of transition circuit
In the present embodiment, vacuum type on load tap changer transition circuit comprises main contact A, main contact B, vacuum contact A, vacuum contact B, change over switch T
1, change over switch T
2, transition resistance R
1with transition resistance R
2;
(1) odd number of points of main contact A and transformer regulating winding connects in succession, and main contact B is connected with the even number tap of transformer regulating winding; Namely as shown in Figure 1, main contact A and N puts and connects, and main contact B and N+1 puts and connects.
(2) change over switch T
1comprise the first fixed contact, the second fixed contact and moving contact, wherein the first fixed contact and odd number of points connect in succession, and the second fixed contact is by transition resistance R
1be connected with even number tap, one end of moving contact is connected with vacuum contact A, simultaneously the other end of moving contact and the first fixed contact, and is slidably connected with the second fixed contact.
Change over switch T
2comprise the first fixed contact, the second fixed contact and moving contact, wherein the first fixed contact with by transition resistance R
2connect in succession with odd number of points, the second fixed contact is connected with even number tap, and one end of moving contact is connected with vacuum contact B, simultaneously the other end of moving contact and the first fixed contact, and is slidably connected with the second fixed contact.
Transition resistance R in the present embodiment
1with transition resistance R
2resistance identical, i.e. R
1=R
2=R.
(3) vacuum contact A and vacuum contact B includes the vacuum contact of two series connection;
As shown in Figure 1, vacuum contact A comprises vacuum contact V11 and V12 of series connection, and vacuum contact B comprises vacuum contact V21 and V22 of series connection.
Main contact A, main contact B, vacuum contact A are all connected with transformer neutral point with the other end of vacuum contact B, with output load current.
Two, the method for operation of transition circuit
The change over selector that suppose there is the tap selector of on-load shunting switch just puts invariant position, and on load tap changer gear numbering is consistent with tap selector sets of contacts label, and on load tap changer gear will rise to an even gear N+1 from an odd gear N.
(1) when the odd number of points of tap selector and transformer regulating winding connects in succession, as shown in Figure 1, main contact A conducting, main contact B disconnection, vacuum contact A conducting, vacuum contact B conducting, change over switch T
1moving contact be connected with the first fixed contact, change over switch T
2moving contact be connected with the first fixed contact;
1, change to even number tap when tap selector is switched through by odd number of points, concrete operation method comprises:
(1) as shown in Figure 1, main contact A closes, load current I
nexport through main contact A;
(2) as shown in Figure 2, described main contact A is disconnected, load current I
nflow through change over switch T successively
1export with vacuum contact A;
(3) as shown in Figure 3, disconnect described vacuum contact A, produce electric arc, after this arc extinction, load current I
nflow through transition resistance R successively
2, change over switch T
2export with vacuum contact B, the recovery voltage U at described vacuum contact A two ends
a=I
n× R
2=I
n× R;
(4) as shown in Figure 4, after in vacuum contact A, electric arc extinguishes completely, change over switch T
1moving contact and the first fixed contact disconnect, load current I
nflow through transition resistance R successively
2, change over switch T
2export with vacuum contact B;
(5) as shown in Figure 5, change over switch T
1moving contact and the second fixed contact close, load current I
nflow through transition resistance R successively
2, change over switch T
2export with vacuum contact B;
(6) as shown in Figure 6, described vacuum contact A closes, and transition circuit forms bridge joint, produces circulating current
vacuum contact A by circulation and load current equidirectional, can think that load current is evenly through vacuum contact A and B, then flow through change over switch T
1, vacuum contact A electric current be:
u
sfor on load tap changer step voltage;
(7) as shown in Figure 7, vacuum contact B disconnects, and produces electric arc, after this arc extinction, and load current I
nflow through transition resistance R successively
1, change over switch T
1export with vacuum contact A.So producing recovery voltage at vacuum contact B two ends is U
b=U
s+ I
nr
1=U
s+ I
nr, U
sfor on load tap changer step voltage.
(8) as shown in Figure 8, change over switch T
2moving contact and the first fixed contact disconnect, load current I
nflow through transition resistance R successively
1, change over switch T
1export with vacuum contact A;
(9) as shown in Figure 9, change over switch T
2moving contact and the second fixed contact close, load current I
nflow through transition resistance R successively
1, change over switch T
1export with vacuum contact A;
(10) as shown in Figure 10, change over switch T
2moving contact and the second fixed contact closed after, load current I
nflow through change over switch T successively
2export with vacuum contact B;
(11) as shown in figure 11, main contact B closes, and carries electric current I
nflow through main switching contact B to export, tap change operation terminates, and diverter switch completes one-level pressure regulation.
(2) when the tap selector of on load tap changer is connected with the even number tap of transformer dividing potential drop winding, as shown in figure 11, main contact B conducting, main contact A disconnection, vacuum contact A conducting, vacuum contact B conducting, change over switch T
1moving contact is connected with the second fixed contact, change over switch T
2moving contact is connected with the second fixed contact, load current I
nexport through main contact B.
When tap selector is transformed into odd number tap by even number tap, it is completely contrary that concrete operation method and tap selector switch through the operating process of changing to even number tap by odd number of points, is specially:
(1) as shown in Figure 10, described main contact B is disconnected, load current I
nflow through change over switch T successively
2export with vacuum contact B;
(2) as shown in Figure 9, disconnect described vacuum contact B, produce electric arc, after this arc extinction, load current I
nflow through transition resistance R successively
1, change over switch T
1export with vacuum contact A, the recovery voltage U at described vacuum contact B two ends
b=I
n× R
1=I
nr;
(3) as shown in Figure 8, after in vacuum contact B, electric arc extinguishes completely, change over switch T
2moving contact and the first fixed contact disconnect, load current I
nflow through transition resistance R successively
1, change over switch T
1export with vacuum contact A;
(4) as shown in Figure 7, change over switch T
2moving contact and the second fixed contact close, load current I
nflow through transition resistance R successively
1, change over switch T
1export with vacuum contact A;
(5) as shown in Figure 6, described vacuum contact B closes, and transition circuit forms bridge joint, produces circulating current
vacuum contact B by circulation and load current equidirectional, can think that load current is evenly through vacuum contact A and B, then flow through change over switch T
2, vacuum contact B electric current be:
u
sfor on load tap changer step voltage;
(6) as shown in Figure 5, vacuum contact A disconnects, and produces electric arc, after this arc extinction, and load current I
nflow through transition resistance R successively
2, change over switch T
2export with vacuum contact B.So producing recovery voltage at vacuum contact A two ends is U
a=U
s+ I
nr
2=U
s+ I
nr, U
sfor on load tap changer step voltage.
(7) as shown in Figure 4, change over switch T
1moving contact and the second fixed contact disconnect, load current I
nflow through transition resistance R successively
2, change over switch T
2export with vacuum contact B;
(8) as shown in Figure 3, change over switch T
1moving contact and the first fixed contact close, load current I
nflow through transition resistance R successively
2, change over switch T
2export with vacuum contact B;
(9) as shown in Figure 2, change over switch T
1moving contact and the first fixed contact closed after, load current I
nflow through change over switch T successively
1export with vacuum contact A;
(10) as shown in Figure 1, main contact A closes, load current I
nexport through main contact A, tap change operation terminates, and diverter switch completes one-level pressure regulation.
Three, in the present embodiment, the diverter switch task of vacuum type on load tap changer transition circuit is as shown in the table:
Wherein, I
nfor load current; N is tap change operation number of times; U
sfor on load tap changer step voltage; R is transition resistance.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (3)
1. a vacuum type on load tap changer transition circuit, is characterized in that, described transition circuit comprises main contact A, main contact B, vacuum contact A, vacuum contact B, change over switch T
1, change over switch T
2, transition resistance R
1with transition resistance R
2;
The odd number of points of described main contact A and transformer regulating winding connects in succession, and main contact B is connected with the even number tap of transformer regulating winding;
Described change over switch T
1comprise the first fixed contact, the second fixed contact and moving contact; Described first fixed contact and described odd number of points connect in succession, and described second fixed contact is by transition resistance R
1be connected with described even number tap, one end of described moving contact is connected with vacuum contact A, the other end and the first fixed contact, and the second fixed contact is slidably connected;
Described change over switch T
2comprise the first fixed contact, the second fixed contact and moving contact; Described first fixed contact is by transition resistance R
2connect in succession with described odd number of points, described second fixed contact is connected with described even number tap; One end of described moving contact is connected with vacuum contact B, the other end and the first fixed contact, and the second fixed contact is slidably connected.
2. transition circuit as claimed in claim 1, is characterized in that, described vacuum contact A and vacuum contact B includes the vacuum contact of two series connection; Described transition resistance R
1with transition resistance R
2resistance identical.
3. transition circuit as claimed in claim 1, it is characterized in that, described main contact A, main contact B, vacuum contact A are all connected with transformer neutral point with the other end of vacuum contact B, with output load current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420792348.4U CN204230109U (en) | 2014-12-12 | 2014-12-12 | A kind of vacuum type on load tap changer transition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420792348.4U CN204230109U (en) | 2014-12-12 | 2014-12-12 | A kind of vacuum type on load tap changer transition circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204230109U true CN204230109U (en) | 2015-03-25 |
Family
ID=52928176
Family Applications (1)
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|---|---|---|---|
| CN201420792348.4U Active CN204230109U (en) | 2014-12-12 | 2014-12-12 | A kind of vacuum type on load tap changer transition circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104465168A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Transition circuit of vacuum type on-load tap-changer and operation method |
| CN112071672A (en) * | 2020-07-22 | 2020-12-11 | 中国电力科学研究院有限公司 | Vacuum on-load tap-changer transition device and switching method of transition device |
| WO2021258621A1 (en) * | 2020-06-24 | 2021-12-30 | 中国电力科学研究院有限公司 | Vacuum on-load tap-changer transition circuit with isolation contacts and voltage regulation method |
-
2014
- 2014-12-12 CN CN201420792348.4U patent/CN204230109U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104465168A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Transition circuit of vacuum type on-load tap-changer and operation method |
| WO2021258621A1 (en) * | 2020-06-24 | 2021-12-30 | 中国电力科学研究院有限公司 | Vacuum on-load tap-changer transition circuit with isolation contacts and voltage regulation method |
| CN112071672A (en) * | 2020-07-22 | 2020-12-11 | 中国电力科学研究院有限公司 | Vacuum on-load tap-changer transition device and switching method of transition device |
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