CN103683192A - Large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method - Google Patents
Large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method Download PDFInfo
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- CN103683192A CN103683192A CN201310547595.8A CN201310547595A CN103683192A CN 103683192 A CN103683192 A CN 103683192A CN 201310547595 A CN201310547595 A CN 201310547595A CN 103683192 A CN103683192 A CN 103683192A
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Abstract
The invention provides a large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method. The apparatus is formed as follows: the main control switch of a transformer is connected in parallel with a charging circuit; the charging circuit is composed of a first charging switch, a second charging switch and a charging transformer; the first charging switch and the second charging switch are respectively connected in series with the two ends of the charging transformer; and the switching-off and switching-on of each switch are controlled by a PLC. The compression method is as follows: turning on the first charging switch, and starting the charging transformer; after the charging transformer is started and enters a stable state, switching on the second charging switch, and starting the large-capacity transformer; when the large-capacity transformer enters a stable state, switching on the main control switch, and bypassing the charging transformer; and switching off the second charging switch and the first charging switch. The compression effects of excitation inrush currents of the large-capacity transformer provided by the invention are more improved, and at the same time since PLC control is adopted in a transformer starting process, the operation is more convenient; and the apparatus and method provided by the invention have the advantages of simple structure, convenient maintenance, low processing cost, high production efficiency and the like.
Description
Technical field
The invention belongs to electric power system for distribution field, while especially relating to a kind of large capacity phase-shifting rectifier transformer startup, magnetizing inrush current suppresses circuit and method.
Background technology
Only the flow through a certain side of transformer of the magnetizing inrush current of transformer (exciting curent).During steady operation, the exciting current of transformer is little, only has 2～5% of rated current.In the situation that voltage recovers after no-load transformer input and Removal of external faults, may occur that very large exciting current is magnetizing inrush current.Its amplitude can reach 6～8 times of transformer rated current, although it is to not directly harm of transformer itself, easily causes the misoperation of transformer relay protection circuit.Particularly modern high-power transformer is for raising the efficiency, and the work magnetic flux density of design is very high, and this situation is even more serious.On the other hand, due to the complexity day by day of electric power system, the variation of electric equipment, the transition effect occurring on any position all can be propagated in system, amplifies under certain conditions, thereby jeopardize other electric equipments with other device coupled.
The magnetizing inrush current inhibition method of transformer can be divided into two large classes: one, for the transformer of not yet making, by internal control, from the excitation principle of transformer core, change the structure of transformer, as resistor insertion method and change winding distribution; Two,, for existing transformer, by external control, in the outside of transformer, take some remedial measures.Can be divided into again two kinds of methods: 1, for control switch, as used phase selection/delay to close a floodgate, change current protection value and delay time; 2, the charge circuit that increases transformer seals in resistance, inductance, autotransformer in charge circuit.Utilize charge circuit to start high-power transformer, when it enters after stable state, then charge circuit is excised.
What in practice, comparatively commonly use is string compensator starting, the method is transplanted and is come by large capacity motor starting method, but there is defect in using, when main switch is during by the former secondary short circuit of autotransformer, to there is short circuit in autotransformer inside, its mechanical structure and electric insulation are caused damage, shorten its useful life.
Summary of the invention
The problem to be solved in the present invention is: inhibition circuit and the method for magnetizing inrush current while the object of the present invention is to provide a kind of large capacity phase-shifting rectifier transformer to start, reduce the impact of transformer excitation flow to electrical network, the inhibition of magnetizing inrush current while being especially applicable to the startup of low-voltage high-capacity transformer.
For solving the problems of the technologies described above, the technical scheme that the invention adopts is: a kind of large capacity phase-shifting rectifier transformer transformer inrush current suppression apparatus, charged in parallel circuit on the main switching control Q1 of described large capacity phase-shifting rectifier transformer T2, described charging circuit is comprised of the first charge switch Q2, the second charge switch Q3 and charging transformer T1, and described the first charge switch Q2 and the second charge switch Q3 are connected on respectively the two ends of described charging transformer T1; Described main switching control Q1, described the first charge switch Q2 are all connected PLC with the second charge switch Q3, and control divide-shut brake by PLC.
Between described main switching control Q1 and two charge switch Q2, Q3, increase feedback interlocking, in the combined floodgate control loop of described the first charge switch Q2, be provided with the normally-closed contact of described main switching control Q1, in the combined floodgate control loop of described the second charge switch Q3, be provided with the normally opened contact of described the first charge switch Q2, in the combined floodgate control loop of main switching control Q1, be provided with the normally opened contact of the second charge switch Q3.
The method of utilizing above-mentioned large capacity phase-shifting rectifier transformer transformer inrush current suppression apparatus to carry out magnetizing inrush current inhibition, comprises the steps:
Closed described the first charge switch Q2 of a.PLC, starts described charging transformer T1;
B. until described charging transformer T1, started and entered after the first lower state, closed described the second charge switch Q3 of PLC, starts described large capacity phase-shifting rectifier transformer T2;
C. until described large capacity phase-shifting rectifier transformer T2, started and entered after the second lower state, the closed described main switching control Q1 of PLC, bypasses described charging transformer T1;
D. after the 3rd delay time t3=1s, PLC disconnects described the second charge switch Q3;
E. after the 4th delay time t4=1s, PLC disconnects described the first charge switch Q2, and so far start-up course is complete.
In step b, described the first lower state refers to the state that the first delay time t1 is 2s.
In step c, described the second lower state refers to the state that the second delay time t2 is 2s.
Advantage and good effect that the present invention has are: owing to adopting technique scheme, the inhibition of the magnetizing inrush current of high-power transformer is more perfect, control because transformer start-up course adopts PLC simultaneously, and it is more convenient to operate; Have simple in structurely, easy to maintenance, processing cost is low, production efficiency advantages of higher.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the circuit theory diagrams that the present invention controls by PLC;
Fig. 3 is the control flow chart that PLC of the present invention controls;
Fig. 4 is the sequential chart (1 represents that switch closes a floodgate, and 0 represents switch separating brake) of each on off state of the present invention.
In figure:
Q1: main switching control, Q2: the first charge switch (starting T1), Q3: the second charge switch (starting T2), T1: charging transformer, T2: large capacity phase-shifting rectifier transformer;
Embodiment
As shown in Figure 1, a kind of large capacity phase-shifting rectifier transformer transformer inrush current suppression apparatus, charged in parallel circuit on the main switching control Q1 of described large capacity phase-shifting rectifier transformer T2, described charging circuit is comprised of the first charge switch Q2, the second charge switch Q3 and charging transformer T1, and described the first charge switch Q2 and the second charge switch Q3 are connected on respectively the two ends of described charging transformer T1; Its principle is, when transformer starts, the size of its magnetizing inrush current is relevant with the equivalent short circuit impedance starting in loop, due to the capacity of large capacity phase-shifting rectifier transformer greatly but voltage is low, therefore its short-circuit impedance is very little; Increasing charging transformer is exactly in fact to strengthen the equiva lent impedance starting in loop, from reducing in essence magnetizing inrush current; Described main switching control Q1, described the first charge switch Q2 and the second charge switch Q3 control by PLC.Consider the heating problem of charging transformer, need to be after large capacity phase-shifting rectifier transformer starts in several seconds in, charging transformer is excised, therefore whole start-up course is controlled and is carried out by PLC, automaticity is higher, operate simplyr, simultaneously due to accurate control, extend the useful life of charging transformer.
Simultaneously, in order to prevent misoperation, described main switching control Q1 and two charge switch Q2, between Q3, increase feedback interlocking, in the combined floodgate control loop of described the first charge switch Q2, be provided with the normally-closed contact (not allowing closed Q2 under Q1 "on" position) of described main switching control Q1, in the combined floodgate control loop of described the second charge switch Q3, be provided with the normally opened contact (just allowing closed Q3 under Q2 "on" position) of described the first charge switch Q2, in the combined floodgate control loop of main switching control Q1, be provided with the normally opened contact (just allowing closed Q1 under Q3 "on" position) of the second charge switch Q3.
Utilize foregoing circuit to carry out the method for magnetizing inrush current inhibition, comprise the steps:
A. closed described the first charge switch Q2, starts described charging transformer T1;
B. until described charging transformer T1, started and entered after the first lower state (being set to delay time t1=2s), closed described the second charge switch Q3, starts described large capacity phase-shifting rectifier transformer T2;
C. until described large capacity phase-shifting rectifier transformer T2, started and entered after the second lower state (being set to delay time t2=2s), closed described main switching control Q1, bypasses described charging transformer T1;
D. after the 3rd delay time t3=1s, disconnect described the second charge switch Q3;
E. after the 4th delay time t4=1s, disconnect described the first charge switch Q2, so far start-up course is complete.
Above one embodiment of the present of invention are had been described in detail, but described content is only for the preferred embodiment of invention, can not be considered to for limiting working of an invention scope.All equalization variations of doing according to the present patent application scope and improvement etc., within all should still belonging to patent covering scope of the present invention.
Claims (5)
1. a large capacity phase-shifting rectifier transformer transformer inrush current suppression apparatus, it is characterized in that: at the upper charged in parallel circuit of main switching control (Q1) of described large capacity phase-shifting rectifier transformer (T2), described charging circuit is comprised of the first charge switch (Q2), the second charge switch (Q3) and charging transformer (T1), and described the first charge switch (Q2) and the second charge switch (Q3) are connected on respectively the two ends of described charging transformer (T1); Described main switching control (Q1), described the first charge switch (Q2) and the second charge switch (Q3) are all connected PLC; And control divide-shut brake by PLC.
2. large capacity phase-shifting rectifier transformer transformer inrush current suppression apparatus according to claim 1, it is characterized in that: between described main switching control (Q1) and two charge switchs (Q2, Q3), increase feedback interlocking, in the combined floodgate control loop of described the first charge switch (Q2), be provided with the normally-closed contact of described main switching control (Q1), in the combined floodgate control loop of described the second charge switch (Q3), be provided with the normally opened contact of described the first charge switch (Q2), in the combined floodgate control loop of main switching control (Q1), be provided with the normally opened contact of the second charge switch (Q3).
3. the method for utilizing the large capacity phase-shifting rectifier transformer transformer inrush current suppression apparatus described in claim 1 or 2 to carry out magnetizing inrush current inhibition, is characterized in that: comprise the steps:
Closed described the first charge switch (Q2) of a.PLC, starts described charging transformer (T1);
B. until described charging transformer (T1), started and entered after the first lower state, closed described the second charge switch (Q3) of PLC, starts described large capacity phase-shifting rectifier transformer (T2);
C. until described large capacity phase-shifting rectifier transformer (T2), started and entered after the second lower state, the closed described main switching control (Q1) of PLC, bypasses described charging transformer (T1);
D. after the 3rd delay time t3=1s, PLC disconnects described the second charge switch (Q3);
E. after the 4th delay time t4=1s, PLC disconnects described the first charge switch (Q2), and so far start-up course is complete.
4. method according to claim 3, is characterized in that: in step b, described the first lower state refers to the state that the first delay time t1 is 2s.
5. method according to claim 3, is characterized in that: in step c, described the second lower state refers to the state that the second delay time t2 is 2s.
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| CN201310547595.8A CN103683192A (en) | 2013-11-06 | 2013-11-06 | Large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method |
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| CN201310547595.8A CN103683192A (en) | 2013-11-06 | 2013-11-06 | Large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681643A (en) * | 2017-09-22 | 2018-02-09 | 国网江西省电力公司电力科学研究院 | A kind of high-tension fuse for suppressing distribution transforming excitation surge current |
| CN108092261A (en) * | 2017-11-30 | 2018-05-29 | 国网北京市电力公司 | Combined floodgate mode selection method, device and the storage medium of cascade transformer |
| CN108987075A (en) * | 2018-07-05 | 2018-12-11 | 上海电动工具研究所（集团）有限公司 | Electric system on high-tension transformer based on multistage preliminary filling magnetic function |
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| EP1858147A2 (en) * | 2006-05-18 | 2007-11-21 | Converteam SAS | Current conversion circuit |
| CN101702360A (en) * | 2009-11-10 | 2010-05-05 | 中国船舶重工集团公司第七一二研究所 | Pre-magnetizing device of power supply transformer and pre-magnetizing method thereof |
| CN201732648U (en) * | 2010-07-26 | 2011-02-02 | 武汉港迪电气有限公司 | Transformer pre-magnetizing device |
| CN202094605U (en) * | 2011-06-17 | 2011-12-28 | 高德义 | Pre-excitation device for power transformer |
| CN102779612A (en) * | 2012-08-07 | 2012-11-14 | 泰州海田电气制造有限公司 | Pre-magnetizing device for main power supply transformer of electric power circuit |
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2013
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1858147A2 (en) * | 2006-05-18 | 2007-11-21 | Converteam SAS | Current conversion circuit |
| CN101702360A (en) * | 2009-11-10 | 2010-05-05 | 中国船舶重工集团公司第七一二研究所 | Pre-magnetizing device of power supply transformer and pre-magnetizing method thereof |
| CN201732648U (en) * | 2010-07-26 | 2011-02-02 | 武汉港迪电气有限公司 | Transformer pre-magnetizing device |
| CN202094605U (en) * | 2011-06-17 | 2011-12-28 | 高德义 | Pre-excitation device for power transformer |
| CN102779612A (en) * | 2012-08-07 | 2012-11-14 | 泰州海田电气制造有限公司 | Pre-magnetizing device for main power supply transformer of electric power circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681643A (en) * | 2017-09-22 | 2018-02-09 | 国网江西省电力公司电力科学研究院 | A kind of high-tension fuse for suppressing distribution transforming excitation surge current |
| CN108092261A (en) * | 2017-11-30 | 2018-05-29 | 国网北京市电力公司 | Combined floodgate mode selection method, device and the storage medium of cascade transformer |
| CN108987075A (en) * | 2018-07-05 | 2018-12-11 | 上海电动工具研究所（集团）有限公司 | Electric system on high-tension transformer based on multistage preliminary filling magnetic function |
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Application publication date: 20140326 |