CN203616369U - Special riser transformer for low voltage energization - Google Patents
Special riser transformer for low voltage energization Download PDFInfo
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- CN203616369U CN203616369U CN201320709690.9U CN201320709690U CN203616369U CN 203616369 U CN203616369 U CN 203616369U CN 201320709690 U CN201320709690 U CN 201320709690U CN 203616369 U CN203616369 U CN 203616369U
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Abstract
A special riser transformer for low voltage energization comprises two groups of current transformers. Each group of current transformers comprises three current transformers and adopts Y/yn0 wiring. Each current transformer comprises one input coil and an output coil. Dotted terminals of the three input coils of each group of the current transformers are connected with a three-phase current input terminal. Variant name terminals of the three input coils of each group of current transformers form short circuit and then are connected with a common current input terminal. Dotted terminals of the three output coils of each group of the current transformers are connected with a three-phase current output terminal. Variant name terminals of the three output coils of each group of current transformers form the short circuit and then are connected with a common current output terminal. The structures of the two groups of current transformers are the same. In the prior art, a secondary detection current is too small and the current is difficult to identify. By using the transformer of the utility model, the above problems are solved.
Description
Technical field
The utility model belongs to the electric device of rail traction substation application, specifically the applied low pressure special up-flow mutual inductor of switching on when electric substation's low pressure energizing test.
Background technology
Along with rail traction substation capacity increases, current transformer ratio continues to increase, and by original 1250A/5A, gradually becomes 2000A/5A, 2000A/1A etc.Adopt prior art low pressure step mode to detect transformer differential protection loop; because the electric current that secondary circuit detects is less than 0.05A; protection equipment for transformer almost None-identified electric current is to disturb from mutual inductor or loop, cannot reliably judge that by test whether transformer differential protection loop polarity is correct.
Summary of the invention
Too little in order to solve the secondary detection electric current that prior art exists, impalpable technical matters, the purpose of this utility model be to provide a kind of simple in structure, apply easily the low pressure special up-flow mutual inductor of switching on; It can amplify electric current according to fixed proportion, realize electric current identification, thereby reliably judge that whether transformer differential protection loop polarity is correct.
It is as follows that the utility model is realized the technical scheme that described object takes: a kind of low pressure special up-flow mutual inductor of switching on, is characterized in that: comprise two groups of current transformers; Every group of current transformer comprises three current transformers, adopts Y/yn0 wiring; Every current transformer comprises an input coil and an output winding, the Same Name of Ends of three input coils of every group of current transformer is connected with three-phase current input terminal, after the different name end short circuit of three input coils of every group of current transformer, is connected with common current input terminal; The Same Name of Ends of three output windings of every group of current transformer is connected with three-phase current lead-out terminal, after the different name end short circuit of three output windings of every group of current transformer, is connected with common current lead-out terminal; The structure of two groups of current transformers is identical.
The object of existing electric substation low pressure energizing test, whether the differential protection loop wiring that is detection electric substation high voltage side current mutual inductor, electric substation's low-pressure side current transformer and protection equipment for transformer composition is correct, and whether transformer connection group meets wiring; When use, the corresponding connection of output terminal, common current output terminal of the input terminal of first group of current transformer of the present utility model, common current input terminal and electric substation's high voltage side current mutual inductor, the corresponding connection of high voltage side current secondary line wire size of the lead-out terminal of this group current transformer, common current lead-out terminal and protection equipment for transformer; The corresponding connection of output terminal, common current output terminal of the input terminal of second group of current transformer, common current input terminal and electric substation's low-pressure side current transformer; The corresponding connection of low-pressure side electric current secondary line wire size of the lead-out terminal of this group current transformer, common current lead-out terminal and protection equipment for transformer; Like this; before secondary current is introduced protection equipment for transformer; through utility model, the output current of electric substation's high voltage side current mutual inductor and electric substation's low-pressure side current transformer is amplified; thereby allow protection equipment for transformer reliable recognition, realize small electric stream and also can reliably judge the object whether differential secondary connection is correct.
Accompanying drawing explanation
Fig. 1 is prior art transformer differential protection secondary connection schematic diagram,
Fig. 2 is structural representation of the present utility model,
Fig. 3 is the structural relation schematic diagram of the utility model and prior art transformer differential protection.
In figure: CT1-electric substation high voltage side current mutual inductor, CT2-electric substation low-pressure side current transformer, B-transformer, J-protection equipment for transformer, A431, B431, C431, N431-electric substation high voltage side current secondary line wire size (different electric substations wire size may be different), A461, B461, C461, N461-low-pressure side electric current secondary line wire size (different electric substations wire size may be different), CT-the utility model is the low pressure special up-flow mutual inductor of switching on, the 1-the first group current transformer, CTA-First current transformer, CTB-the second current transformer, CTC-three current transformer, the 2-the second group current transformer, CTa-four current transformer, CTb-five current transformer, CTc-six current transformer, A1, B1, the three-phase current input terminal of C1-the first group current transformer, the common current input terminal of N1-the first group current transformer, A2, B2, the three-phase current lead-out terminal of C2-the first group current transformer, the common current lead-out terminal of N2-the first group current transformer, a1, b1, the three-phase current input terminal of c1-the second group current transformer, the common current input terminal of n1-the second group current transformer, a2, b2, the three-phase current lead-out terminal of c2-the second group current transformer, the common current lead-out terminal of n2-the second group current transformer.
Embodiment
Shown in Fig. 1, be existing transformer differential protection low pressure energizing test device secondary connection schematic diagram, this figure only relates to the part with generation annexation of the present invention; It comprises the high voltage side current mutual inductor CT1 of electric substation, electric substation's low-pressure side Current Transmit 2, transformer B and protection equipment for transformer J; In the time of low pressure energizing test; transformer B both sides electric current is fixed proportion relation; both sides electric current is respectively after Current Transmit 1, CT2 diminish; inflow transformer protective device J; protection equipment for transformer J is according to the transformer B mode of connection; inflow current is carried out to angular transformation, then carry out direction of current, size relatively, as the entry condition of differential protection outlet.If test inflow current is too little; whether protection equipment for transformer J does not distinguish input current or interference current, can not judge for eight wiring (A431, B431, C431, N431, A461, B461, C461, N461) of differential protection correct by research technique.
As shown in Figure 2: a kind of low pressure of the utility model special up-flow mutual inductor of switching on, comprises first group of current transformer 1 and second group of current transformer 2; First group of current transformer 1 comprises three current transformers, i.e. First Current Transmit A, second Current Transmit B and the 3rd Current Transmit C adopts Y/yn0 wiring; Every current transformer comprises an input coil and an output winding, the Same Name of Ends of three input coils of first group of current transformer is connected with three-phase current input terminal A1, B1 and C1, after the different name end short circuit of three input coils of first group of current transformer, is connected with common current input terminal N1; The Same Name of Ends of three output windings of first group of current transformer is connected with three-phase current lead-out terminal A2, B2 and C2, after the different name end short circuit of three output windings of first group of current transformer, is connected with common current lead-out terminal N2; The structure of two groups of current transformers is identical, and the structure of second group of current transformer is identical with the structure of first group of current transformer group, and second group of current transformer connection mode is identical with first group; Second group of current transformer comprises the 4th Current Transmit a, the 5th Current Transmit b and the 6th Current Transmit c, the Same Name of Ends of three input coils of second group of current transformer is connected with three-phase current input terminal a1, b1 and c1, after the different name end short circuit of three input coils of second group of current transformer, is connected with common current input terminal n1; The Same Name of Ends of three output windings of second group of current transformer is connected with three-phase current lead-out terminal a2, b2 and c2, after the different name end short circuit of three output windings of second group of current transformer, is connected with common current lead-out terminal n2.
The parameter apolegamy of the special up-flow mutual inductor of the utility model: six current transformers adopt identical no-load voltage ratio, and choose suitable no-load voltage ratio value, suitably amplified current, makes the protection equipment for transformer can reliable recognition; Referring to Fig. 3, because current source is from electric substation's secondary winding in current transformer, therefore in the time selecting current transformer of the present utility model, need to consider that input coil is with the impedance matching between electric substation's secondary winding in current transformer.
The technical requirement of the special up-flow mutual inductor of the utility model: on the one hand, guarantee that between all electric current input quantities and output quantity, polarity is correct, unified according to the wiring of the Y/yn0 mode of connection; On the other hand, guarantee the capacity of output winding, when loading on while changing within the scope of rated impedance, ratio error does not affect and judges transformer differential protection loop polarity.
Referring to Fig. 3: the utility model CT is during for test connection, three-phase current input terminal A1, B1, C1 and the common current input terminal N1 of first group of current transformer 1 and the output terminal of the high voltage side current mutual inductor CT1 of electric substation and the corresponding connection of common current output terminal thereof, three-phase current lead-out terminal A2, B2, C21 and the common current lead-out terminal N2 of first group of current transformer 1 and the high voltage side current secondary line wire size A431 of protection equipment for transformer J, B431, C431, the corresponding connection of N431; Output terminal and the corresponding connection of common current output terminal thereof of three-phase current input terminal a1, b1, c1 and the common current input terminal n1 of second group of current transformer 2 and electric substation low-pressure side Current Transmit 2; The corresponding connection of low-pressure side electric current secondary line wire size of three-phase current lead-out terminal a2, b2, c2 and the common current lead-out terminal n2 of second group of current transformer 2 and protection equipment for transformer J.
Terminal A1, B1, C1, N1 are connected with electric substation high voltage side current mutual inductor, for receiving secondary input current, are, after CT amplifies, to export to protection equipment for transformer by terminal A2, B2, C2, N2 through the utility model; Terminal a1, b1, c1, n1 are connected with electric substation low-pressure side current transformer, for receiving secondary input current, are, after CT amplifies, to export to protection equipment for transformer by terminal a2, b2, c2, n2 through the utility model.
In Fig. 3, during with special up-flow mutual inductor CT test connection, must notice that electric current flows into and flows out direction, exact connect ion A(a), B(b), C(c) mutually and common current N(n).
After the utility model is combined with prior art; before secondary current is introduced protection equipment for transformer J; through the low pressure special up-flow mutual inductor CT that switches on, electric current is amplified; thereby allow protection equipment for transformer J reliable recognition, realize small electric stream and also can reliably judge the object whether differential secondary connection is correct.
In low pressure energizing test process, the safety prevention measure of taking is identical with the method that does not increase special up-flow mutual inductor.
In low pressure energizing test process; the electric current that protection equipment for transformer detects; polarity and angle do not change; the just corresponding multiple of current value; do not affect difference current and stalling current direction; as long as each phase stalling current is far longer than homophase difference current, and difference current is approximately 0A, can illustrate that transformer differential second protection circuit connection is correct.
Claims (3)
1. the low pressure special up-flow mutual inductor of switching on, is characterized in that: comprise two groups of current transformers; Every group of current transformer comprises three current transformers, adopts Y/yn0 wiring; Every current transformer comprises an input coil and an output winding, the Same Name of Ends of three input coils of every group of current transformer is connected with three-phase current input terminal, after the different name end short circuit of three input coils of every group of current transformer, is connected with common current input terminal; The Same Name of Ends of three output windings of every group of current transformer is connected with three-phase current lead-out terminal, after the different name end short circuit of three output windings of every group of current transformer, is connected with common current lead-out terminal; The structure of two groups of current transformers is identical.
2. a kind of low pressure as claimed in claim 1 special up-flow mutual inductor of switching on, it is characterized in that: output terminal and the corresponding connection of common current output terminal thereof of the three-phase current input terminal of first group of current transformer and common current input terminal and electric substation's high voltage side current mutual inductor, the corresponding connection of high voltage side current secondary line wire size of the three-phase current lead-out terminal of first group of current transformer and common current lead-out terminal and protection equipment for transformer; Output terminal and the corresponding connection of common current output terminal thereof of the three-phase current input end of second group of current transformer and common current input terminal and electric substation's low-pressure side current transformer; The corresponding connection of low-pressure side electric current secondary line wire size of the three-phase current lead-out terminal of second group of current transformer and common current lead-out terminal and protection equipment for transformer.
3. a kind of low pressure as claimed in claim 1 or 2 special up-flow mutual inductor of switching on, is characterized in that: six current transformers adopt identical no-load voltage ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320709690.9U CN203616369U (en) | 2013-11-12 | 2013-11-12 | Special riser transformer for low voltage energization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320709690.9U CN203616369U (en) | 2013-11-12 | 2013-11-12 | Special riser transformer for low voltage energization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203616369U true CN203616369U (en) | 2014-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320709690.9U Withdrawn - After Issue CN203616369U (en) | 2013-11-12 | 2013-11-12 | Special riser transformer for low voltage energization |
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| Country | Link |
|---|---|
| CN (1) | CN203616369U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675386A (en) * | 2013-11-12 | 2014-03-26 | 中铁二十一局集团电务电化工程有限公司 | Upflow transformer for low-voltage energization |
-
2013
- 2013-11-12 CN CN201320709690.9U patent/CN203616369U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675386A (en) * | 2013-11-12 | 2014-03-26 | 中铁二十一局集团电务电化工程有限公司 | Upflow transformer for low-voltage energization |
| CN103675386B (en) * | 2013-11-12 | 2016-04-13 | 中铁二十一局集团电务电化工程有限公司 | Upflow transformer for low-voltage energization |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140528 Effective date of abandoning: 20160413 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |