CN204390895U - Integrated polytropic ratio instrument transformer - Google Patents

Integrated polytropic ratio instrument transformer Download PDF

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Publication number
CN204390895U
CN204390895U CN201520121021.9U CN201520121021U CN204390895U CN 204390895 U CN204390895 U CN 204390895U CN 201520121021 U CN201520121021 U CN 201520121021U CN 204390895 U CN204390895 U CN 204390895U
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China
Prior art keywords
transformer
side winding
instrument transformer
secondary side
integrated
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CN201520121021.9U
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Chinese (zh)
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郑毅
唐广瑜
付永长
曾天
张文斌
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CHENGDU POWER SUPPLY Co OF STATE GRID SICHUAN ELECTRIC POWER Corp
State Grid Corp of China SGCC
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CHENGDU POWER SUPPLY Co OF STATE GRID SICHUAN ELECTRIC POWER Corp
State Grid Corp of China SGCC
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Priority to CN201520121021.9U priority Critical patent/CN204390895U/en
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Abstract

A kind of integrated polytropic ratio instrument transformer, comprises the first measurement current transform er; The secondary side winding of the first measurement current transform er comprises head end and end, also comprises at least one tap terminals; Also comprise the first protective current instrument transformer identical with the first measurement current transform er structure, the second measurement current transform er and the second protective current instrument transformer; Also comprise the first voltage transformer and the second voltage transformer.The secondary side winding head end of all instrument transformers, end and tap terminals be connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell.The no-load voltage ratio that the utility model achieves instrument transformer is adjustable, meets distribution line and runs the requirement that can adjust mutual inductor ratio according to load condition; Volume is little, occupies little space, and is conducive to installing, and overall appearance simplifies the mode of connection, improves the standardization level of distribution work, reduce the difficulty of site operation, shorten construction period, saved integrated cost, be convenient to later maintenance.

Description

Integrated polytropic ratio instrument transformer
Technical field
The utility model relates to electric power system power distribution technical field of automation, particularly a kind of integrated polytropic ratio instrument transformer.
Background technology
In power distribution network and automated system thereof, distribution Intelligent FTU is generally divided into terminal FTU on post, station terminal D TU and distribution transformer terminal TTU.These intelligent terminals all will realize gathering the functions such as power circuit electric current, voltage, power factor (PF), harmonic information, line fault information, also need to obtain from power circuit back-up electric power (charge power supply as to the distribution terminal back-up source) supply supporting distribution terminal work, these tasks all need to realize by installing corresponding voltage transformer summation current transformer on the line simultaneously.
In known information collecting method, 10kV and following electric pressure power distribution network and automated system site intelligent line feed terminals thereof gather power distribution network real-time traffic information, are that many voltage transformer summation current transformers to discrete carry out the data acquisitions such as mid & low-voltage line electric current, voltage, fault current, harmonic wave respectively by air plug cable or direct wiring terminal board mode.Mainly there is following defect in this method:
1. the voltage transformer summation current transformer of independent, many groups is long in the construction and installation cycle separately, integrated cost is high, detail design is complicated, it is large to take up room, thus cause equipment wiring complicated, greatly, it is obvious especially that the instrument transformer be especially separated when these needs to be arranged on the problem that the cross-arm on electric force pole tower exposes for installation and later maintenance difficulty.
2., under fixing mutual inductor ratio, adopt high no-load voltage ratio instrument transformer and reverse situation under long-term underload, all can cause the inaccurate for a long time of accuracy in measurement, Quality Down, reduce the ageing and accuracy of electrical power distribution automatization system operational monitoring, practical of poor quality.Due to current some Electricity customers or regional power load very low or very high in a period of time, fluctuating drop is larger, some enterprise is along with the change adjustment production in market, and the change of power load that rural area causes along with the change in season, if when no-load voltage ratio is not mated and makes instrument transformer exceed measuring range for a long time, existing fixing no-load voltage ratio method declines making the ageing of the operational monitoring of distribution line and accuracy, time serious, another group current transformer must be needed, redefine corresponding mutual inductor ratio.This method is not only bothersome takes a lot of work, and needs the enforcement that has a power failure, and the cost that also adds additional power supply enterprise drops into, and the instrument transformer pulled down is not easy to preserve, discarded very unfortunate.
Utility model content
The purpose of this utility model is to provide a kind of integrated polytropic ratio instrument transformer.
The technical scheme realizing the utility model object is as follows:
A kind of integrated polytropic ratio instrument transformer, comprises the first measurement current transform er; Described first measurement current transform er comprises first side winding and secondary side winding; Described secondary side winding comprises head end and end, also comprises at least one tap terminals; Winding between described first side winding and secondary side winding head end and end forms the first no-load voltage ratio, and the winding between secondary side winding head end and tap terminals forms the second no-load voltage ratio, and the winding between secondary side winding tap terminals and end forms the 3rd no-load voltage ratio, by that analogy; Also comprise the first protective current instrument transformer identical with the first measurement current transform er structure, the second measurement current transform er and the second protective current instrument transformer; The secondary side winding head end of all instrument transformers, end and tap terminals be connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell.
Further, the first voltage transformer and the second voltage transformer is also comprised; The secondary side winding head end of described voltage transformer, end and tap terminals be also connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell.
Further, three measurement current transform er identical with the first measurement current transform er structure and the 3rd protective current instrument transformer is also comprised; The secondary side winding head end of described 3rd measurement current transform er and the 3rd protective current instrument transformer, end and tap terminals be also connected to secondary wiring terminals respectively and integration packaging in insulated full-enclosed shell.
Further, back-up source voltage transformer is also comprised; One end of the secondary side winding of described back-up source voltage transformer is connected to earth terminal, and the other end is connected to 220V lead-out terminal.
Compared with prior art, the beneficial effects of the utility model are: by the centre tap of access Current Transformer Secondary coil, when not changing instrument transformer and pass through the instrument transformer secondary side difference punching number of turn designed in advance, the no-load voltage ratio achieving instrument transformer is adjustable, meets distribution line and runs the requirement adjusting mutual inductor ratio according to load condition in real time.Volume is little, occupies little space, and is conducive to installing, and overall appearance simplifies the mode of connection.The voltage of instrument transformer secondary side, current terminal are connected on the data information acquisition terminal of line feed terminals through air plug cable, greatly improve the standardization level of distribution work, effectively reduce the difficulty of site operation, shorten construction period, saved integrated cost and be convenient to later maintenance.The combined instrument transformer of integral structure has convenient and swift, safe and reliable, cost savings, the advantage such as attractive in appearance, and the required interruption duration of mutual inductor ratio adjustment is short, and the comprehensive benefit for power supply enterprise has remarkable lifting.
Accompanying drawing explanation
Fig. 1 is principle and the connected mode figure of integrated polytropic ratio instrument transformer.
Embodiment
As shown in Figure 1, integrated polytropic ratio instrument transformer 6, comprises the first measurement current transform er 1; Described first measurement current transform er comprises first side winding and secondary side winding; Described secondary side winding comprises head end as1 and end as3, also comprises at least one tap terminals as2; Winding between described first side winding and secondary side winding head end as1 and end as3 forms the first no-load voltage ratio, and the winding between secondary side winding head end as1 and tap terminals as2 forms the second no-load voltage ratio, and the winding between secondary side winding tap terminals as2 and end as3 forms the 3rd no-load voltage ratio, by that analogy; Also comprise the first protective current instrument transformer (in protective current instrument transformer figure all not shown) identical with the first measurement current transform er 1 structure, the second measurement current transform er 2 and the second protective current instrument transformer; The secondary side winding head end of all instrument transformers, end and tap terminals be connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell.
During use, first integrated polytropic ratio instrument transformer is installed to three-phase distribution circuit, wherein the first side winding of the first measurement current transform er 1 and the first protective current instrument transformer is connected to a wherein phase, the second measurement current transform er 2 and the second protective current instrument transformer first side winding be connected to another phase; Again according to electric pressure with gather the precision needed and determine to gather the no-load voltage ratio required for measurement data, by the first measurement current transform er 1 on secondary wiring terminals to the secondary side winding terminal of no-load voltage ratio being connected to measurement data acquisition air plug terminal corresponding in line feed terminals by electric current air plug; Then with identical no-load voltage ratio, by the second measurement current transform er 2 on secondary wiring terminals to the secondary side winding terminal of no-load voltage ratio being connected in line feed terminals corresponding measurement data acquisition air plug terminal by electric current air plug; Also be first determine to gather the no-load voltage ratio required for protected data to the collection of protected data, by the first protective current instrument transformer on secondary wiring terminals to the secondary side winding terminal of no-load voltage ratio should being connected to protected data corresponding in line feed terminals by electric current air plug and gathering air plug terminal; By the second protective current instrument transformer on secondary wiring terminals to the secondary side winding terminal of no-load voltage ratio should being connected in line feed terminals corresponding protected data by electric current air plug and gathering air plug terminal.
In order to gather voltage data simultaneously, be also provided with the first voltage transformer 4 and the second voltage transformer 5; The secondary side winding head end of voltage transformer, end and tap terminals be also connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell.During use, the first side winding of the first voltage transformer 4 and the second voltage transformer 5 is connected to three-phase distribution circuit according to V/V connection; First voltage transformer 4 on secondary wiring terminals and the respective secondary side winding terminal of the second voltage transformer 5 are connected to voltage acquisition air plug terminal respective in line feed terminals by voltage air plug.
Some application needs the electric current simultaneously gathering three-phase, is therefore also provided with three measurement current transform er 3 identical with the first measurement current transform er 1 structure and the 3rd protective current instrument transformer; The secondary side winding head end of described 3rd measurement current transform er 3 and the 3rd protective current instrument transformer, end and tap terminals be also connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell, its using method is similar.
In addition, in order to give distribution terminal back-up source charge power supply is provided, be also provided with back-up source voltage transformer 0; One end of the secondary side winding of back-up source voltage transformer 0 is connected to earth terminal, and the other end is connected to 220V lead-out terminal.
The voltage used in collection, current transformer is that many transformer integrations are integrated, and adopt the insulated full-enclosed structure of poured with epoxy resin to be enclosed in shell, by traditional discrete install voltage transformer summation current transformer integrated combination together, builtin voltage collection forms the wiring of " V/V " type by two single-phase all insulation voltage transformers and realizes, and current acquisition is serially connected in A respectively by three current transformers, B, C three-phase realizes, the secondary winding of current transformer can obtain different ER effect ratios with tap, solid and reliable binding post is all installed in each tap, terminal does anti-electricity-theft process.In data acquisition, only need that the two-way voltage terminal of extraction and three-phase current terminal are supplied to line feed terminals by air plug cable and carry out data acquisition.
Acquisition method is mainly used in 10kV and following electric pressure distribution line, and in Fig. 1, label 1 is integrated the A phase current mutual inductor of combination transformer; Label 2 is integrated the B phase current mutual inductor of combination transformer; Label 3 is integrated the C phase current mutual inductor of combination transformer, and threephase current transformer is serially connected on circuit three-phase respectively; Label 4,5 is integrated the voltage transformer of combination transformer, two voltage transformers respectively cross-over connection between the two phases, form " V/V " connection, a/b/c is voltage transformer secondary side terminal.The combined instrument transformer body that label 6 is integrated, integrated instrument transformer is connected with current acquisition terminal with the voltage acquisition terminal of line feed terminals by external cable air plug, carries out information data collection.Wherein winding leading-out wire as1/as2/as3 in Current Transformer Secondary side is the tap of A phase current mutual inductor secondary side winding, by selecting different tap to adjust mutual inductor ratio; The tap of instrument transformer A phase secondary side winding first and last is respectively as1, as3, and centre tap is as2.As being the current transformer of 400/5 for maximum no-load voltage ratio, draw tap as1 at head end, in the middle of thereafter, draw tap as2 make its no-load voltage ratio be 400/5, can realize no-load voltage ratio by first and last end tap as1 and as3 is 200/5.In like manner, bs1/bs2/bs3 and cs1/cs2/cs3 is respectively its secondary side winding tap for B phase and C phase.Therefore, when needs adjustment mutual inductor ratio, as long as change wire connecting terminal of transformer, regulation time shortens dramatically, and interruption duration also greatly reduces, and operating efficiency obtains significant increase, thus directly reduces operation and maintenance expenses use.

Claims (5)

1. an integrated polytropic ratio instrument transformer, is characterized in that, comprises the first measurement current transform er (1); Described first measurement current transform er comprises first side winding and secondary side winding; Described secondary side winding comprises head end (as1) and end (as3), also comprises at least one tap terminals (as2); Winding between described first side winding and secondary side winding head end (as1) and end (as3) forms the first no-load voltage ratio, and the winding between secondary side winding head end (as1) and tap terminals (as2) forms the second no-load voltage ratio, and the winding between secondary side winding tap terminals (as2) and end (as3) forms the 3rd no-load voltage ratio, by that analogy; Also comprise the first protective current instrument transformer identical with the first measurement current transform er (1) structure, the second measurement current transform er (2) and the second protective current instrument transformer; The secondary side winding head end of all instrument transformers, end and tap terminals be connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell.
2. integrated polytropic ratio instrument transformer as claimed in claim 1, is characterized in that, also comprises the first voltage transformer (4) and the second voltage transformer (5); The secondary side winding head end of described voltage transformer, end and tap terminals be also connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell.
3. integrated polytropic ratio instrument transformer as claimed in claim 1 or 2, is characterized in that, also comprises three measurement current transform er (3) identical with the first measurement current transform er (1) structure and the 3rd protective current instrument transformer; The secondary side winding head end of described 3rd measurement current transform er (3) and the 3rd protective current instrument transformer, end and tap terminals be also connected respectively to secondary wiring terminals and integration packaging in insulated full-enclosed shell.
4. integrated polytropic ratio instrument transformer as claimed in claim 1 or 2, is characterized in that, also comprises back-up source voltage transformer (0); One end of the secondary side winding of described back-up source voltage transformer (0) is connected to earth terminal, and the other end is connected to 220V lead-out terminal.
5. integrated polytropic ratio instrument transformer as claimed in claim 3, is characterized in that, also comprises back-up source voltage transformer (0); One end of the secondary side winding of described back-up source voltage transformer (0) is connected to earth terminal, and the other end is connected to 220V lead-out terminal.
CN201520121021.9U 2015-03-02 2015-03-02 Integrated polytropic ratio instrument transformer Active CN204390895U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104637663A (en) * 2015-03-02 2015-05-20 国网四川省电力公司成都供电公司 Integrated multi-transformation-ratio transformer and data collection method thereof
CN107015044A (en) * 2016-08-24 2017-08-04 何排枝 Transformer in the middle of a kind of high-precision high voltage isolation
CN107393705A (en) * 2016-03-11 2017-11-24 马克西姆综合产品公司 Integrated transformer and coupling inductor and associated switch power converter and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104637663A (en) * 2015-03-02 2015-05-20 国网四川省电力公司成都供电公司 Integrated multi-transformation-ratio transformer and data collection method thereof
CN107393705A (en) * 2016-03-11 2017-11-24 马克西姆综合产品公司 Integrated transformer and coupling inductor and associated switch power converter and method
CN107015044A (en) * 2016-08-24 2017-08-04 何排枝 Transformer in the middle of a kind of high-precision high voltage isolation

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