CN204424071U - A kind of electrical wiring loop of current transformer - Google Patents

A kind of electrical wiring loop of current transformer Download PDF

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Publication number
CN204424071U
CN204424071U CN201520167494.2U CN201520167494U CN204424071U CN 204424071 U CN204424071 U CN 204424071U CN 201520167494 U CN201520167494 U CN 201520167494U CN 204424071 U CN204424071 U CN 204424071U
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China
Prior art keywords
winding
current
binding post
current binding
wire
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Expired - Fee Related
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CN201520167494.2U
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Chinese (zh)
Inventor
李传东
尹庆
杨爱华
赵兴永
李传红
何敬国
穆建国
邢忠
付兆升
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Shandong Iron and Steel Group Co Ltd SISG
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Shandong Iron and Steel Group Co Ltd SISG
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Priority to CN201520167494.2U priority Critical patent/CN204424071U/en
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Abstract

This application discloses a kind of electrical wiring loop of current transformer, comprise a winding and secondary winding, one time winding is made up of brace, series conductor connecting plate and the second wire outside the first wire connected successively, instrument transformer, there are three primary current binding posts, can to realize and tie and series wiring two kinds of modes of connection, thus to make current transformer realize two kinds of different ER effect ratios; Secondary winding is at least provided with three secondary current binding posts, by changing the mode of connection, current transformer can be made at least to realize two kinds of different ER effect ratios.Therefore, when without the need to changing current transformer, by coordinating the current wiring terminal selecting a winding and secondary winding, the instructions for use of user to multiple current no-load voltage ratio can be met.

Description

A kind of electrical wiring loop of current transformer
Technical field
The utility model relates to current transformer technical field, in particular, relates to a kind of electrical wiring loop of current transformer.
Background technology
Current transformer is as electric equipment important in electric power system; for the big current in primary circuit is transformed into secondary small area analysis; to realize the measurement of power equipment relevant parameter, metering, monitoring and protection; therefore; the correct reliability service of current transformer, plays an important role to the safe operation of electric power system.
Due to reasons such as the adjustment of user's Production mode, device upgrade transformation or Seasonal Production features, usually occur the situation that electric load changes greatly, therefore, single ER effect is than the demand that can not meet user.At present; conventional solution changes the current transformer of different ER effect ratio according to the actual requirements; although this way can meet the demand of user; but; the process changing current transformer is comparatively loaded down with trivial details; meanwhile, change the process of current transformer be easy to cause wiring incorrect, lack of standardization cause protective device malfunction, tripping, electric energy metrical and indicating instrument inaccurate, thus jeopardize the safe and reliable operation of power supply unit.Therefore, how to provide a kind of electrical wiring loop of current transformer, when without the need to changing current transformer, still can meet the demand of user to multiple current no-load voltage ratio is those skilled in the art's problem demanding prompt solutions.
Utility model content
In view of this, the utility model provides a kind of electrical wiring loop of current transformer, to realize still meeting the demand of user to multiple current no-load voltage ratio when without the need to changing current transformer.
An electrical wiring loop for current transformer, comprising: a winding and secondary winding;
A described winding comprises: the first wire, second wire, brace and series conductor connecting plate outside instrument transformer, described first wire is connected with described second wire with described series conductor connecting plate by brace outside described instrument transformer successively, and described first wire and described second wire are all through iron core, when primary current binding post as a described winding of the two ends of described first wire, a described winding is and tie, when the primary current binding post of one end that one end that described first wire is not connected with brace outside described instrument transformer and described second wire are not connected with described series conductor connecting plate as a described winding, a described winding is series wiring,
Described secondary winding is at least provided with three secondary current binding posts.
Preferably, described secondary winding is multiple, is respectively protective winding, stand-by protection winding, measures winding and measure winding.
Preferably, described protective winding, described stand-by protection winding, described measurement winding are identical with the umber of turn of described measure winding and around to unanimously.
Preferably, described secondary winding is the secondary winding with independent iron core.
Preferably, two described secondary current binding posts in three of described secondary winding described secondary current binding posts are for connecting load.
Preferably, in two for connecting load in described secondary winding described secondary current binding posts, the secondary current binding post flowing back to described secondary winding for secondary current connects earth terminal.
Preferably, the secondary current binding post be not connected with load in described secondary winding is for connecting earth terminal.
Preferably, the primary current binding post of described winding inflow primary current and the secondary current binding post of described secondary winding outflow secondary current are the current wiring terminal of homopolar end mark.
As can be seen from above-mentioned technical scheme, the utility model provides a kind of electrical wiring loop of current transformer, comprise a winding and secondary winding, one time winding forms by connecting brace outside the first wire, instrument transformer, series conductor connecting plate and the second wire successively, there are three primary current binding posts, wherein inlet wire current terminal one, outlet current terminal two can realize and tie and series wiring two kinds of modes of connection, thus makes current transformer realize two kinds of different ER effect ratios; Secondary winding is at least provided with three secondary current binding posts, by changing the mode of connection, current transformer can be made at least to realize two kinds of different ER effect ratios.Therefore, when without the need to changing current transformer, by coordinating the current wiring terminal selecting a winding and secondary winding, the instructions for use of user to multiple current no-load voltage ratio can be met.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The circuit diagram in Fig. 1 a kind of electrical wiring loop of current transformer disclosed in the utility model embodiment;
The circuit diagram in Fig. 2 a kind of electrical wiring loop of current transformer disclosed in the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, 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 utility model protection.
The utility model embodiment discloses a kind of electrical wiring loop of current transformer, to realize still meeting the demand of user to multiple current no-load voltage ratio when without the need to changing current transformer.
See Fig. 1, the circuit diagram in the electrical wiring loop of a kind of current transformer that the utility model embodiment provides, comprising: a winding and secondary winding;
Wherein,
One time winding comprises: the first wire 11 (two ends of the first wire 11 are mark P1 and C2 in Fig. 1), second wire 12 (one end of the second wire 12 is the mark P2 in Fig. 1), brace C3 and series conductor connecting plate C1 outside instrument transformer, first wire 11 is connected with the second wire 12 with series conductor connecting plate C1 by brace C3 outside instrument transformer successively, and the first wire 11 and the second wire 12 are all through iron core (not shown in figure 1), when primary current binding post as a winding of the two ends of the first wire 11, one time winding is and tie, when the primary current binding post of one end (the mark P2 namely in Fig. 1) that one end that the first wire 11 is not connected with brace C3 outside instrument transformer (the mark P1 namely in Fig. 1) and the second wire 12 are not connected with series conductor connecting plate C1 as a winding, a winding is series wiring,
Concrete, as the primary current I from electrical network 1flow into from primary current binding post P1, when flowing out from primary current binding post C2, one time winding is and tie; As the primary current I from electrical network 1flow into from primary current binding post P1, when flowing out from primary current binding post P2, a winding is series wiring.Therefore, winding by and tie and series wiring two kinds of modes of connection, current transformer can be made to obtain two kinds of different ER effect ratios.
Secondary winding is at least provided with three secondary current binding posts.
Concrete, see Fig. 1, the centre (preferred middle) of secondary winding is provided with a centre tap, tap is provided with secondary current binding post S2, the head end of secondary winding, centre and end respectively draw a binding post, being respectively secondary current binding post S1, secondary current binding post S2 and secondary current binding post S3, by selecting different secondary current binding posts, two kinds of different ER effect ratios can being realized.
The operation principle in the electrical wiring loop of current transformer is specific as follows:
The no-load voltage ratio of current transformer primary current is the wiring position by changing primary current binding post, namely by a change windings in series wiring and and tie two kinds of modes of connection, changes the number of turn that winding passes iron core.When a winding is series wiring mode, be equivalent in iron core, wear two circles; When a winding is the mode of connection in parallel, be equivalent in iron core, wear a circle, according to primary current I 1, secondary current I 2with a number of turn N 1, secondary number of turn N 2the relational expression I of no-load voltage ratio 1/ I 2=N 2/ N 1=K (K is ER effect ratio), when the secondary winding number of turn is identical, the ER effect wearing a winding (and tie) of a circle in iron core is than two times of ER effect ratio being a winding (series wiring) of wearing two circles in iron core, therefore, winding by and tie and series wiring two kinds of modes of connection, current transformer can be made to obtain two kinds of different ER effect ratios.
Suppose that the head end of the secondary winding of current transformer, middle and end respectively draw a binding post, then the no-load voltage ratio of Current Transformer Secondary electric current is that two terminals in binding post by selecting in secondary winding first and last end and the tap of secondary winding middle carry out wiring, centre tap draws binding post from the middle of secondary winding, the secondary winding number of turn is divided into two, according to primary current I 1, secondary current I 2with a number of turn N 1, secondary number of turn N 2the relational expression I of no-load voltage ratio 1/ I 2=N 2/ N 1=K (K is ER effect ratio), at a number of turn N 1constant, as secondary number of turn N 2increase when being twice, ER effect doubles than K, therefore from the ER effect of secondary winding first and last end terminal connections than being from the twice of head end with the ER effect ratio of centre tap terminated line.Therefore, secondary winding, by changing the mode of connection of secondary circuit, can make current transformer obtain two kinds of different ER effect ratios.
Suppose that a winding of current transformer adopts series wiring (namely a winding meets primary current binding post P1 and primary current binding post P2), when the secondary current binding post S1 of secondary winding is connected load 01 with secondary current binding post S3, ER effect ratio is 300/5;
Then a winding adopts series wiring (namely a winding meets primary current binding post P1 and primary current binding post P2), when the secondary current binding post S1 of secondary winding is connected load 01 with secondary current binding post S2, ER effect ratio is 150/5;
One time winding adopts and tie (namely a winding meets primary current binding post P1 and primary current binding post C2), when the secondary current binding post S1 of secondary winding is connected load 01 with secondary current binding post S3, ER effect ratio is 600/5;
One time winding adopts and tie (namely a winding meets primary current binding post P1 and primary current binding post C2), when the secondary current binding post S1 of secondary winding is connected load 01 with secondary current binding post S2, ER effect ratio is 300/5.
Visible, in the present embodiment, by changing the mode of connection of a winding and secondary winding, can obtain three kinds of different ER effect ratios, namely ER effect ratio is respectively 600/5,300/5 and 150/5.
In summary it can be seen, the electrical wiring loop of the current transformer that the utility model provides, comprise a winding and secondary winding, one time winding is made up of brace, series conductor connecting plate and the second wire outside the first wire connected successively, instrument transformer, there are three primary current binding posts, can to realize and tie and series wiring two kinds of modes of connection, thus to make current transformer realize two kinds of different ER effect ratios; Secondary winding is at least provided with three secondary current binding posts, by changing the mode of connection, current transformer can be made at least to realize two kinds of different ER effect ratios.Therefore, when without the need to changing current transformer, by coordinating the current wiring terminal selecting a winding and secondary winding, the instructions for use of user to multiple current no-load voltage ratio can be met.
It should be noted that, secondary winding in the application is the secondary winding with independent iron core, two secondary current binding posts in three secondary current binding posts of secondary winding are for connecting load 01, for connecting in two secondary current binding posts of load in secondary winding, the secondary current binding post flowing back to described secondary winding for secondary current connects earth terminal, and this earth terminal is reliably connected with the base of current transformer.
Certainly, the secondary current binding post be not connected with load 01 in secondary winding also can connect earth terminal separately.
In actual applications, secondary winding in above-described embodiment is multiple, specifically see Fig. 2, the circuit diagram in the electrical wiring loop of a kind of current transformer that another embodiment of the utility model provides, secondary winding is four, is followed successively by protective winding, stand-by protection winding from left to right, measures winding and measure winding;
Wherein, these four secondary winding are and are provided with tapped secondary winding, and each secondary winding has independently iron core, that is, each iron core only has a secondary winding, have four iron cores, the first wire of a winding and the second wire are simultaneously through these four iron cores.
It should be noted that, secondary winding accuracy class of different nature is different, and in the present embodiment, the accuracy class of protective winding and stand-by protection winding is 5P20, and the accuracy class measuring winding is 0.5, and the accuracy class of measure winding is 0.2S.
Protective winding, stand-by protection winding, measure that winding is identical with the number of turn of measure winding and around to unanimously, each secondary winding according to self needs, by selecting the different modes of connection, can be met the ER effect ratio of oneself requirement.
It should be noted that; the utility model is for guaranteeing the reliability of correct and protective device 02 action of electric energy metrical (can see the metering electric energy meter kWh in Fig. 2), indicating instrument (can see the ammeter A in Fig. 2); additionally provide that secondary winding loop is correct, the mode of connection of specification, specific as follows:
1, homopolar end mark: according to the principle of current transformer subtractive polarity mark, homopolar end mark is carried out to a secondary winding binding post, that is, when a winding flows into primary current from the primary current binding post being labeled as homopolar end, the secondary current induced in secondary winding flows out from the secondary current binding post being labeled as homopolar end;
2, the connection type of secondary winding and iron core: to being provided with tapped secondary winding, should distinguish each secondary winding and have independent iron core or share an iron core before wiring;
3, magnetic circuit closes principle: for the secondary winding with independent iron core, and the secondary magnetic circuit of secondary winding must be all or at least partially closed; Share the secondary winding of the band tap wiring of same iron core, after a part of secondary magnetic circuit of secondary winding is closed, other residue windings section of secondary winding must not connect again;
4, magnetic potential balance principle: according to the principle of electromagnetic induction and magnetic potential balance, induce electric current I in secondary winding 2, and with secondary magnetomotive force I 2n 2remove counteracting magnetomotive force I 1n 1, the magnetic potential balance equation of existence is: I 1n 1+ I 2n 2=0.Wherein flow through the ratio I of electric current in first and second winding 1/ I 2be called ER effect ratio.Known, change the number of turn of a winding or secondary winding, just can change ER effect ratio.
5, secondary winding ground connection: each secondary winding has the necessary ground connection in one end, and all earth terminals of each secondary winding reliably all should be connected with base for current transformer, and can only one point earth.
Specific in the present embodiment, shown in Figure 2, suppose that a winding is series wiring, and primary current I 1entered by primary current binding post P1, flow out from primary current binding post P2.
According to current transformer subtractive polarity marking principles, primary current binding post P1 and secondary current binding post 1S1 (or 2S1 or 3S1 or 4S1) is homopolar end, marks by symbol "●", therefore, during secondary winding wiring, and secondary current I 2should flow out from secondary current binding post 1S1 (or 2S1 or 3S1 or 4S1) and enter load, flow back to secondary current binding post 1S2 (or 2S2 or 3S2 or 4S2) or 1S3 (or 2S3 or 3S3 or 4S3) again, that is, the wiring of current transformer one secondary winding polarity should be correct.If polarity wiring error, for protective winding, protective device 02 malfunction may be caused to cause switch trip; For measurement winding or measure winding, the loss of the inaccurate or electricity of electric current indicating instrument may be caused.
During protective winding wiring, secondary current I 2flow out from secondary current binding post 1S1 and enter protective device 02, then flow back to secondary current binding post 1S2, secondary current binding post 1S2 connects earth terminal, and 1S3 is empty for secondary current binding post.Reason is: because the winding between secondary current binding post 1S1, secondary current binding post 1S2 and secondary current binding post 1S3 shares same iron core, under this kind of mode of connection, secondary current I 2flow between secondary current binding post 1S1 and secondary current binding post 1S2, its secondary magnetic flux produced plays demagnetizing effect to a magnetic flux, and main flux density is very little, therefore high pressure can not be produced between secondary current binding post 1S2 and secondary current binding post 1S3.Meanwhile, secondary current binding post 1S2 and secondary current binding post 1S3 must not short circuit, otherwise, primary current I 1magnetic flux will be produced in the middle of secondary current binding post 1S1, secondary current binding post 1S2 and secondary current binding post 1S2, secondary current binding post 1S3 two winding in parallel simultaneously, thus make current transformer produce error, cause ER effect than increasing, secondary side winding can only export very little secondary current I 2, thus protective device tripping may be caused.
Stand-by protection winding is as time for subsequent use; should by secondary current binding post 2S1 and secondary current binding post 2S3 short circuit (or in secondary current binding post 2S1, secondary current binding post 2S2 and secondary current binding post 2S3 any two current wiring terminal short circuits), and by secondary current binding post 2S3 reliable ground.Because stand-by protection winding and other secondary winding are around on different iron cores; each iron core and a secondary winding have independently magnetic potential balance equation; therefore the secondary winding short circuit that needs will not use; otherwise, can, because secondary winding open circuit, cause a magnetomotive force all for excitation; cause iron core supersaturation; main flux density in iron core is increased greatly, thus produces high voltage in secondary winding, danger is brought to human body and device security.
When measuring winding connection, secondary current I 2flow out from secondary current binding post 3S1 and enter ammeter A, then flow back to secondary current binding post 3S2.Must not short circuit between secondary current binding post 3S2 and secondary current binding post 3S3, secondary current binding post 3S2 connects earth terminal.Under this kind of mode of connection, if secondary current binding post 3S2 and secondary current binding post 3S3 short circuit, primary current I 1magnetic flux will be produced in the middle of secondary current binding post 3S1, secondary current binding post 3S2 and secondary current binding post 3S2, secondary current binding post 3S3 these two winding in parallel simultaneously, thus make current transformer produce error, cause ER effect than increasing, cause measurement result to produce larger measurement negative error, and then primary current I can not be reflected 1truth.
During measure winding wiring, secondary current I 2flow out the current coil entering electric energy meter kWh from secondary current binding post 4S1, then flow back to secondary current binding post 4S3.4S2 is empty for secondary current binding post, and secondary current binding post 4S3 connects earth terminal.If by secondary current binding post 4S2 and secondary current binding post 4S3 short circuit, secondary current binding post 4S1 will be there is in secondary side, secondary current binding post 4S3 and secondary current binding post 4S2, the simultaneous situation of winding that secondary current binding post 4S3 these two is parallel with one another, the load current of primary side will produce magnetic flux in these two windings in parallel simultaneously, namely secondary current binding post 4S1 is defined, secondary current binding post 4S3 and secondary current binding post 4S2, secondary current binding post 4S3 two magnetomotive force loops, result through the secondary current I of electric energy meter kWh 2primary current I can not be reflected 1truth, ER effect is than also being become with primary current I by a fixed value 1the changing value of size variation, thus causing ER effect than increasing, producing larger metering negative error.
In summary it can be seen, Current Transformer Secondary side has one end must ground connection, and during to prevent a secondary winding insulation breakdown, primary side high pressure scurries into secondary side, jeopardizes the person and device security.Meanwhile, all earth terminals of each secondary winding reliably all should be connected with base for current transformer, and can only one point earth.
Can draw, adopt above-mentioned secondary winding mode of connection, the correct of electric energy metrical, indicating instrument and protective device action can be guaranteed accurately and reliably.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (8)

1. an electrical wiring loop for current transformer, is characterized in that, comprising: a winding and secondary winding;
A described winding comprises: the first wire, second wire, brace and series conductor connecting plate outside instrument transformer, described first wire is connected with described second wire with described series conductor connecting plate by brace outside described instrument transformer successively, and described first wire and described second wire are all through iron core, when primary current binding post as a described winding of the two ends of described first wire, a described winding is and tie, when the primary current binding post of one end that one end that described first wire is not connected with brace outside described instrument transformer and described second wire are not connected with described series conductor connecting plate as a described winding, a described winding is series wiring,
Described secondary winding is at least provided with three secondary current binding posts.
2. electrical wiring loop according to claim 1, is characterized in that, described secondary winding is multiple, is respectively protective winding, stand-by protection winding, measures winding and measure winding.
3. electrical wiring loop according to claim 2, is characterized in that, described protective winding, described stand-by protection winding, described measurement winding are identical with the umber of turn of described measure winding and around to unanimously.
4. electrical wiring loop according to claim 1, is characterized in that, described secondary winding is the secondary winding with independent iron core.
5. electrical wiring loop according to claim 1, is characterized in that, two described secondary current binding posts in three described secondary current binding posts of described secondary winding are for connecting load.
6. electrical wiring loop according to claim 1, is characterized in that, in two for connecting load in described secondary winding described secondary current binding posts, the secondary current binding post flowing back to described secondary winding for secondary current connects earth terminal.
7. electrical wiring loop according to claim 1, is characterized in that, the secondary current binding post be not connected with load in described secondary winding is for connecting earth terminal.
8. electrical wiring loop according to claim 1, it is characterized in that, the secondary current binding post of primary current binding post and described secondary winding outflow secondary current that a described winding flows into primary current is the current wiring terminal of homopolar end mark.
CN201520167494.2U 2015-03-24 2015-03-24 A kind of electrical wiring loop of current transformer Expired - Fee Related CN204424071U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104701003A (en) * 2015-03-24 2015-06-10 山东钢铁股份有限公司 Electric connection loop of current transformer
CN107462748A (en) * 2017-08-21 2017-12-12 山东钢铁股份有限公司 The mode of connection of secondary winding in current transformer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104701003A (en) * 2015-03-24 2015-06-10 山东钢铁股份有限公司 Electric connection loop of current transformer
CN107462748A (en) * 2017-08-21 2017-12-12 山东钢铁股份有限公司 The mode of connection of secondary winding in current transformer

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Granted publication date: 20150624