CN102208265A - On-load tapping switch of composite switching-type transformer - Google Patents
On-load tapping switch of composite switching-type transformer Download PDFInfo
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- CN102208265A CN102208265A CN 201110049682 CN201110049682A CN102208265A CN 102208265 A CN102208265 A CN 102208265A CN 201110049682 CN201110049682 CN 201110049682 CN 201110049682 A CN201110049682 A CN 201110049682A CN 102208265 A CN102208265 A CN 102208265A
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Abstract
The invention discloses an on-load tapping switch of a composite switching-type transformer; the on-load tapping switch comprises a plurality of odd taps, a plurality of even taps and an outgoing line terminal, wherein the plurality of odd taps, the plurality of even taps and the outgoing line terminal are connected with a winding of the transformer; the on-load tapping switch is characterized by also comprising a first combination switch and a second combination switch, a first tapping selector and a second tapping selector, wherein a plurality of fixed contacts of the first tapping selector are respectively connected with the plurality of odd taps; a moving contact of the first tapping selector is connected with one end of the first combination switch; a plurality of fixed contacts of the second tapping selector are respectively connected with the plurality of even taps; a moving contact of the second tapping selector are connected with one end of the second combination switch; and the other ends of the first combination switch and the second combination switch are connected with the outgoing line terminal. The on-load tapping switch realizes the commutation without arcing by using the combination switches and the trigger sequential control on the combination switches and has a simple structure and is reliable in work.
Description
Technical field
The present invention relates to field transformer, relate in particular to a kind of compound diverter switch formula on-load tap changers of transformers.
Background technology
In the prior art, operating power transmission and distribution transformer, because the variation of primary side voltage (line voltage), load size and character, secondary side voltage may have bigger variation.For make load voltage maintain prescribed limit (± 5%UN), guarantee the normal need of power consumption equipment, must carry out pressure regulation to the power transmission and distribution transformer.
The basic principle of transformer on-load voltage regulating is to draw some taps from the coil of a certain side of transformer (being generally the high-pressure side), pass through on load tap changer, under the situation of not cutting off load current, by a tap-change operation to another tap, with the conversion effective turn, reach the regulation voltage purpose.On-load tap-changing transformer is made of two parts, and a part is the transformer body, and different with common transformer is to draw a plurality of taps, and another part is an on load tap changer, can be respectively by different manufacturers supply of material assembling acquisition again.
The typical transformer on load tap changer has mechanical type and vacuum type two big classes.The mechanical type on load tap changer has integral type and split type two kinds of structures.
In the prior art, having proposed the realization diverter switch does not have structure and the control method that arc switches, and the diverter switch of design still adopts electro-mechanical mixed structure, needs motor-driven mechanism to drive the moving contact motion, the mechanical mechanism slow motion, and increased maintenance workload.
The diverter switch part of vacuum type on load tap changer no longer adopts moving contact structure, the output of two tap selectors is connected with transformer output terminal with transition resistance with the vacuum switch series connection through vacuum switch respectively again, when needing load tap changer to switch, realize pressure regulation by the action sequence of control vacuum switch.When adopting two transition resistance, need to use four vacuum switches, the vacuum switch that is in off-state bears step voltage always, when needing tap-change operation, realizes blow-out by vacuum switch.Though compare with electro-mechanical mixed diverter switch, removed tractor, the electrical endurance of vacuum switch is still limited, has limited the application of vacuum type shunting switch.
Summary of the invention
(1) technical problem that will solve
The objective of the invention is to switch, and when switching, make vacuum switch not bear step voltage, thereby prolong electrical endurance by using the no arc of vacuum type on load tap changer realization to have to carry.
(2) technical scheme
For achieving the above object, the present invention proposes a kind of compound diverter switch formula on-load tap changers of transformers, comprise a plurality of odd number taps that are connected with the winding of transformer, a plurality of even numbers tap and outlet terminal, also comprise first combination switch and second combination switch, and, first tap selector and second tap selector, wherein
A plurality of fixed contacts of described first tap selector are connected with described a plurality of odd number taps respectively, the moving contact of described first tap selector is connected with an end of described first combination switch, a plurality of fixed contacts of described second tap selector are connected with described a plurality of even numbers taps respectively, the moving contact of described second tap selector is connected with an end of described second combination switch, the other end of described first combination switch and second combination switch is connected described outlet terminal
Described first combination switch is made up of first and second switching branches of parallel connection, and described first switching branches is provided with first vacuum switch, series connection second vacuum switch and the first electronics bidirectional switch on the described second switch branch road,
Described second combination switch is made up of third and fourth switching branches of parallel connection, and described the 3rd switching branches is provided with the 3rd vacuum switch, series connection the 4th vacuum switch and the second electronics bidirectional switch on described the 4th switching branches.
Wherein, described first bidirectional electronic switch is made up of the half control device of two parallel connections.
Wherein, described second bidirectional electronic switch is made up of the half control device of two parallel connections.
Wherein, described half control device is a thyristor.
Wherein, described first bidirectional electronic switch is made up of the full control device of two series connection.
Wherein, described second bidirectional electronic switch is made up of the full control device of two series connection.
Wherein, described full control device is IGBT.
Wherein, described full control device is MOSFET.
(3) beneficial effect
Technique scheme of the present invention has following advantage: utilizes four thyristors to replace transition resistance by using combination switch, realized that the no arc of on load tap changer switches, and simple in structure, reliable operation.
Description of drawings
Fig. 1 is the structural representation of the compound diverter switch formula transformer tap loaded switch of one embodiment of the invention;
Fig. 2 a is the action timing diagram that switch of the present invention is realized tap-change operation;
Fig. 2 b is another action timing diagram that switch of the present invention is realized tap-change operation;
Fig. 3 a is that switch of the present invention thyristor in handoff procedure is realized first kind of triggering sequential chart that no arc switches;
Fig. 3 b is that switch of the present invention thyristor in handoff procedure is realized second kind of triggering sequential chart that no arc switches;
Fig. 3 c is that switch of the present invention thyristor in handoff procedure is realized the third triggering sequential chart that no arc switches;
Fig. 3 d is that switch of the present invention thyristor in handoff procedure is realized the 4th kind of triggering sequential chart that no arc switches.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, structural representation for the on-load tap changers of transformers of the embodiment of the invention, it comprises a plurality of odd number tap J1 that are connected with Transformer Winding, J3 etc., a plurality of even numbers tap J2, J4 etc., outlet terminal N, the first combination switch S1 and the second combination switch S2 and first tap selector and second tap selector, a plurality of fixed contacts of first tap selector respectively with odd number tap J1, connections such as J3, the moving contact R1 of first tap selector is connected with the end of the first combination switch S1, the other end of the first combination switch S1 is connected with outlet terminal N, a plurality of fixed contacts of second tap selector respectively with even numbers tap J2, connections such as J4, the moving contact R2 of second tap selector is connected with the end of the second combination switch S2, and the other end of the second combination switch S2 is connected with outlet terminal N.
The first combination switch S1 is composed in parallel by first and second switching branches, and first switching branches is provided with the first vacuum switch V11, and the second vacuum switch V12 and the first bidirectional electronic switch T1 that second switch props up the route series connection form.
The second combination switch S2 is composed in parallel by third and fourth switching branches, and the 3rd switching branches is provided with the 3rd vacuum switch V21, and the 4th switching branches is made up of the 4th vacuum switch V22 and the second bidirectional electronic switch T2 of series connection.
In the present invention, bidirectional electronic switch can be made up of the half control device of two reverse parallel connections, and the half control device is thyristor for example; Also can form, control device for example IGBT, MOSFET entirely by the full control device of two differential concatenations.Only describe below with the bidirectional electronic switch of forming by the thyristor of two reverse parallel connections.
The compound diverter switch formula on-load tap changers of transformers of the embodiment of the invention of Fig. 1 is split type shunting switch, be characterized in comprising tap selector and diverter switch two parts, tap selector is selected tap when zero load, realized having carrying by diverter switch then and switch.Tap selector is made up of two annulus, a plurality of fixed contacts of first tap selector connect the odd number tap respectively, a plurality of fixed contacts of second tap selector connect the even numbers tap respectively, the moving contact that is dragged selector by the tap selector drive motors is communicated with a tap respectively, and this is identical with conventional on load tap changer.L, N represent winding inlet wire and outlet terminal respectively in 1 figure; The first bidirectional electronic switch T1 is made up of the first thyristor T11 and the second thyristor T12 of reverse parallel connection, and the second bidirectional electronic switch T2 is made up of the 3rd thyristor T21 and the 4th thyristor T22 of reverse parallel connection.The first vacuum switch V11, the second vacuum switch V12, the 3rd vacuum switch V21 and the 4th vacuum switch V22 can also adopt the regular tap of no arc extinguishing function, for example contactor, electronic disconnecting link etc. among Fig. 1 except adopting vacuum switch.
Fig. 2 a and Fig. 2 b are depicted as the action timing diagram that first and second combination switches of the present invention are realized mutual switching controls.
On load tap changer of the present invention realizes that the key that its no arc switches is: accurately control the switching sequential of electronic switch, avoid load open circuit or short circuit in winding; Correct control vacuum switch switching sequential is born steady-state current, reduces on-state loss, and bears off state voltage, avoids the thyristor overvoltage.
Fig. 2 a is the handoff procedure sequential chart of the first combination switch S1 to the second combination switch S2, Fig. 2 b is the handoff procedure sequential chart of the second combination switch S2 to the first combination switch S1, both courses of work are similar substantially, are example interpretation work process with the first combination switch S1 to the handoff procedure of the second combination switch S2 below.
With reference to figure 2a, the first vacuum switch V11 closes before moment t1, and load current circulates through the first vacuum switch V11.Receive switching command CTL constantly at t1, CTL is uprised by low, expression switches to the second combination switch S2 by the first combination switch S1, close the second vacuum switch V12 and the 3rd vacuum switch V22 this moment, and trigger the first bidirectional electronic switch T1 (comprising the first thyristor T11 and the second thyristor T12), because the first bidirectional electronic switch T1 break-make impedance is high and the second bidirectional electronic switch T2 is disconnected, load current is still circulated by the first vacuum switch V11 to the t2.
During t2 to t3, at first disconnect the first vacuum switch V11, make the load current second switch branch road of flowing through.Realize the switching of the first electronics bidirectional switch T1 by sequencing control accurately afterwards, guarantee in this process that the not short circuit of tap winding, load do not open a way to the second electronics bidirectional switch T2.To the path circulation that t3 moment load current is made of the second electronics bidirectional switch T2 and the 4th vacuum switch V22, detailed handoff procedure will describe in detail with reference to figure 3 below.
, three vacuum switch V21 disconnected at the t4 moment second vacuum switch V12 closes, the branch current of the second electronics bidirectional switch T2 and the 4th vacuum switch V22 composition is transferred to the branch road of the 3rd vacuum switch V21, turn-off the 4th vacuum switch V22 constantly at t5 afterwards, stop to trigger the second electronics bidirectional switch T2, finish handoff procedure.Wherein the time-delay between t1 and t2, t3 and t4, t4 and the t5 guarantees that vacuum switch reliably turns on and off.
Fig. 3 a has explained among Fig. 2 a that the first bidirectional electronic switch T1 and the second bidirectional electronic switch T2 (i>0) during the t2 to t3 realize the detailed sequential of no arc switching.Fig. 3 b represents the handoff procedure of first bidirectional electronic switch T1 to the second bidirectional electronic switch T2 (i<0), Fig. 3 c represents the handoff procedure of second bidirectional electronic switch T2 to the first bidirectional electronic switch T1 (i>0), and Fig. 3 d represents the handoff procedure of second bidirectional electronic switch T2 to the first bidirectional electronic switch T1 (i<0).This handoff procedure needs the reference signal of the terminal voltage value of load current direction and the first bidirectional electronic switch T1, the second bidirectional electronic switch T2 as sequencing control.Be the sequencing control process that example is explained electronic switch with Fig. 3 a below.
With reference to figure 3a, in the triggering signal of each thyristor, high level is represented to trigger, and low level is represented not trigger.UT11 represents the terminal voltage value of the first thyristor T11, and uTh represents the reference threshold of uT11.CTL is identical with Fig. 2 a, expression switching command signal.Stop the triggering signal of the first thyristor T11, the second thyristor T12 constantly at t2, the terminal voltage signal that begins to detect the first thyristor T11 afterwards is (when load current i>0, the first thyristor T11 have on-state voltage drop and for just), (establish this and be t23 constantly) triggers the 3rd thyristor T21 and the 4th thyristor T22 when this voltage becomes negative and reaches threshold value uTh, through delaying time to t3, the 3rd thyristor T21 and the reliable conducting of the 4th thyristor T22 are guaranteed in time-delay.Threshold value uTh should get suitable value, as-2V, this value is too high can to produce overvoltage, the too low first thyristor T11 and the second thyristor T12 reliable turn-off of then can not guaranteeing.
Its excess-three kind operating mode operation principle is basic identical, can understand with reference to figure 3b-3d, is not repeated.
Said process is that example has been explained operation principle of the present invention and basic comprising with single-phase winding, Fig. 1 can pass through simple extension, just can be used for three-phase structure, the tap of three-phase on-load tap-changing transformer has structures such as the tap of three-phase star neutral point, the tap of angle scheme end and angle scheme centre tap, no matter which kind of structure does not influence use of the present invention.
The above only is embodiments of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (7)
1. compound diverter switch formula on-load tap changers of transformers, comprise a plurality of odd number taps that are connected with the winding of transformer, a plurality of even numbers tap and outlet terminal, it is characterized in that, also comprise first combination switch and second combination switch, and, first tap selector and second tap selector, wherein
A plurality of fixed contacts of described first tap selector are connected with described a plurality of odd number taps respectively, the moving contact of described first tap selector is connected with an end of described first combination switch, a plurality of fixed contacts of described second tap selector are connected with described a plurality of even numbers taps respectively, the moving contact of described second tap selector is connected with an end of described second combination switch, the other end of described first combination switch and second combination switch is connected described outlet terminal
Described first combination switch is made up of first and second switching branches of parallel connection, and described first switching branches is provided with first vacuum switch, series connection second vacuum switch and the first electronics bidirectional switch on the described second switch branch road,
Described second combination switch is made up of third and fourth switching branches of parallel connection, and described the 3rd switching branches is provided with the 3rd vacuum switch, series connection the 4th vacuum switch and the second electronics bidirectional switch on described the 4th switching branches.
2. compound diverter switch formula on-load tap changers of transformers as claimed in claim 1 is characterized in that described first bidirectional electronic switch is made up of the half control device of two parallel connections.
3. compound diverter switch formula on-load tap changers of transformers as claimed in claim 2 is characterized in that described second bidirectional electronic switch is made up of the half control device of two parallel connections.
4. as claim 2 or 3 described compound diverter switch formula on-load tap changers of transformers, it is characterized in that described half control device is a thyristor.
5. compound diverter switch formula on-load tap changers of transformers as claimed in claim 1 is characterized in that described first bidirectional electronic switch is made up of the full control device of two series connection.
6. as claim 2 or 5 described compound diverter switch formula on-load tap changers of transformers, it is characterized in that described second bidirectional electronic switch is made up of the full control device of two series connection.
7. compound diverter switch formula on-load tap changers of transformers as claimed in claim 6 is characterized in that described full control device is IGBT or MOSFET.
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Cited By (8)
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CN103021642A (en) * | 2011-09-20 | 2013-04-03 | 张伟 | On-load tapping switch |
WO2014101286A1 (en) * | 2012-12-27 | 2014-07-03 | 山东大学 | On-load tap-changer with thyristor auxiliary and working method thereof |
CN104113317A (en) * | 2014-06-12 | 2014-10-22 | 山东大学 | Bypass auxiliary on-load tap-changer and method thereof |
CN105161274A (en) * | 2015-09-30 | 2015-12-16 | 胡群荣 | Transformer on-load voltage regulation method based on thyristor non-arc switch |
CN106298295A (en) * | 2015-05-25 | 2017-01-04 | 北京华天机电研究所有限公司 | On-load shunting switch with bridge connection |
CN108269704A (en) * | 2017-12-29 | 2018-07-10 | 国网北京市电力公司 | Load ratio bridging switch and transformer |
CN108333983A (en) * | 2017-12-27 | 2018-07-27 | 国网北京市电力公司 | Voltage-regulation tap changer, the application method of switch |
CN111899999A (en) * | 2020-06-29 | 2020-11-06 | 南方电网科学研究院有限责任公司 | Power electronic tap changer and distribution transformer |
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CN105305835A (en) * | 2014-05-27 | 2016-02-03 | 江苏省电力公司南京供电公司 | Multistage on-load voltage regulation anti-icing transformer |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1901105A1 (en) * | 1968-02-16 | 1969-10-02 | Siemens Ag | Circuit arrangement for uninterrupted load switching in step transformers |
JPS63104411A (en) * | 1986-10-22 | 1988-05-09 | Hitachi Ltd | On-load tap changer |
CN2437029Y (en) * | 2000-07-24 | 2001-06-27 | 王作志 | Switching switch for dry type loaded distributing switch |
CN101430966A (en) * | 2008-08-21 | 2009-05-13 | 上海华明电力设备制造有限公司 | Thyristor direct switching on-load tap-changer |
CN101807471A (en) * | 2009-02-13 | 2010-08-18 | 上海华明电力设备制造有限公司 | Application of phased permanent magnet mechanism in on-load tap-changer and no-arc transferring on-load tap-changer |
CN101958195A (en) * | 2010-09-19 | 2011-01-26 | 中国农业大学 | Arc-less on-load tap-changer for transformer |
-
2011
- 2011-03-01 CN CN2011100496821A patent/CN102208265B/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1901105A1 (en) * | 1968-02-16 | 1969-10-02 | Siemens Ag | Circuit arrangement for uninterrupted load switching in step transformers |
JPS63104411A (en) * | 1986-10-22 | 1988-05-09 | Hitachi Ltd | On-load tap changer |
CN2437029Y (en) * | 2000-07-24 | 2001-06-27 | 王作志 | Switching switch for dry type loaded distributing switch |
CN101430966A (en) * | 2008-08-21 | 2009-05-13 | 上海华明电力设备制造有限公司 | Thyristor direct switching on-load tap-changer |
CN101807471A (en) * | 2009-02-13 | 2010-08-18 | 上海华明电力设备制造有限公司 | Application of phased permanent magnet mechanism in on-load tap-changer and no-arc transferring on-load tap-changer |
CN101958195A (en) * | 2010-09-19 | 2011-01-26 | 中国农业大学 | Arc-less on-load tap-changer for transformer |
Non-Patent Citations (4)
Title |
---|
《东北农业大学学报》 20080430 杨晓光等 IGBT作为变压器有载分接开关的研究 35-38 1-7 , 第04期 * |
《中国电力》 20031231 骆平等 无弧切换的有载调压变压器 21-23 1-7 , 第S1期 * |
《煤炭技术》 20100131 张品秀等 基于晶闸管反并联的有载分接开关的设计 195-197 1-7 , 第01期 * |
《继电器》 20021115 万凯等 晶闸管辅助机械开关无弧有载调压技术 5-8 1-7 , 第11期 * |
Cited By (12)
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CN103021642A (en) * | 2011-09-20 | 2013-04-03 | 张伟 | On-load tapping switch |
CN103021642B (en) * | 2011-09-20 | 2017-03-01 | 大唐信阳发电有限责任公司 | A kind of load ratio bridging switch |
WO2014101286A1 (en) * | 2012-12-27 | 2014-07-03 | 山东大学 | On-load tap-changer with thyristor auxiliary and working method thereof |
US9898019B2 (en) | 2012-12-27 | 2018-02-20 | Xiaoming Li | Thyristor assisted on-load tap changer and method thereof |
CN104113317A (en) * | 2014-06-12 | 2014-10-22 | 山东大学 | Bypass auxiliary on-load tap-changer and method thereof |
CN104113317B (en) * | 2014-06-12 | 2017-02-15 | 山东大学 | Bypass auxiliary on-load tap-changer and method thereof |
CN106298295A (en) * | 2015-05-25 | 2017-01-04 | 北京华天机电研究所有限公司 | On-load shunting switch with bridge connection |
CN105161274A (en) * | 2015-09-30 | 2015-12-16 | 胡群荣 | Transformer on-load voltage regulation method based on thyristor non-arc switch |
CN108333983A (en) * | 2017-12-27 | 2018-07-27 | 国网北京市电力公司 | Voltage-regulation tap changer, the application method of switch |
CN108269704A (en) * | 2017-12-29 | 2018-07-10 | 国网北京市电力公司 | Load ratio bridging switch and transformer |
CN108269704B (en) * | 2017-12-29 | 2019-09-06 | 国网北京市电力公司 | Load ratio bridging switch and transformer |
CN111899999A (en) * | 2020-06-29 | 2020-11-06 | 南方电网科学研究院有限责任公司 | Power electronic tap changer and distribution transformer |
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