CN202268244U - Current transformer - Google Patents
Current transformer Download PDFInfo
- Publication number
- CN202268244U CN202268244U CN 201120419620 CN201120419620U CN202268244U CN 202268244 U CN202268244 U CN 202268244U CN 201120419620 CN201120419620 CN 201120419620 CN 201120419620 U CN201120419620 U CN 201120419620U CN 202268244 U CN202268244 U CN 202268244U
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- protection
- loop
- current transformer
- transformer
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Abstract
The utility model discloses a current transformer, which is provided with a closed iron core, wherein a primary winding and four secondary windings are arranged on the iron core; the primary winding is connected with a low-voltage side line of a main transformer; and the four secondary windings are respectively connected with a metering loop, a measuring loop, a back-up protection loop and a differential protection loop. By the current transformer, a main transformer protection differential current can be reduced, and the sensitivity and reliability of main transformer protection are improved; and by adoption of a main transformer protection device of a current transformer substation, a power grid can safely and steadily operate. The current transformer has the advantages of simple structure, convenience in use and operation, low cost, simplicity, practicability and the like.
Description
Technical field
The utility model belongs to electrical equipment technical field, particularly a kind of current transformer.
Background technology
Transformer is the electric equipments of transformer station, along with the requirements at the higher level of electric power safety production and electrical network reliable and stable operation, to power trans-former protection require increasingly high.And present 35 kv substation main transformer low-pressure side current transformers all are three groups of secondary winding, and three class of accuracies that it provided time are respectively: 0.2 grade of the secondary winding in current transformer of 1. measuring usefulness; What 2. the measurement electric current of protective device collection adopted is 0.5 grade of secondary winding in current transformer; What 3. the low backup protection electric current of protective device collection adopted is secondary winding in current transformer 10P level; 4. the differential protection electric current of protective device collection does not have special-purpose class of accuracy time winding to satisfy, but with low backup protection string with one group of coil.The major defect one of this current transformer is differential protection and the series connection of low backup protection loop, causes the main transformer protection misoperation easily; The 2nd, in the series loop of main transformer protection electric current, when any point goes wrong, will cause bed rearrangement transformer station to lose tranformer protection, its result might cause the circuit breaker overstep tripping and enlarge the power failure scope.
The utility model content
The purpose of the utility model is to provide a kind of defective that can overcome prior art; Reduce the main transformer protection differential current; Improve the sensitivity of main transformer protection and the reliability of action, guarantee the current transformer transforming plant main transformer depressor protective device of power grid security, even running.
The technical scheme that purpose adopted that realizes the utility model is: a kind of current transformer; Iron core with a closure; Iron core is provided with a winding and 4 secondary winding; Wherein, one time winding is connected with main transformer low-pressure side circuit, and 4 secondary winding are connected with measurement loop respectively, measure loop, backup protection loop and differential protection loop.
The accurate progression of said 4 secondary winding is respectively 0.2 grade, 0.5 grade, 10P20 level and 10P20 level.
The current transformer of the utility model can reduce the main transformer protection differential current, improves the sensitivity of main transformer protection and the reliability of action, guarantees the current transformer transforming plant main transformer depressor protective device of power grid security, even running.And this current transformer has simple in structure, uses advantages such as easy to operate, with low cost, simple and practical.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the structural representation of measurement loop;
Fig. 3 is a structural representation of measuring the loop;
Fig. 4 is the structural representation in backup protection loop;
Fig. 5 is the structural representation of differential protection loop.
Embodiment
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, the current transformer of the utility model, the iron core 1 with a closure, iron core 1 are provided with a winding 2 and 4 secondary winding 3,4,5,6, and wherein, one time winding 2 is connected with main transformer low-pressure side circuit.The accurate progression of 4 secondary winding 3,4,5,6 is respectively: secondary winding 3 is that 0.2 grade, secondary winding 4 are that 0.5 grade, secondary winding 5 and 6 are the 10P20 level.4 secondary winding 3,4,5,6 correspondence successively are connected with measurement loop, measure loop, backup protection loop and differential protection loop.Label 7 is that kilowatt-hour meter, label 8 are the differential protection unit for measurement and control unit, label 9 for backup protection unit, label 10 among the figure.The trial run of current transformer process; Compared with prior art; The main transformer protection differential current obviously reduces; The protective current of protective current that differential protection shows and low backup protection equipment all can reflect the intact of this protection loop correctly, reliably, more safe and reliable assurance the safety of electrical network, stable operation, improved the sensitivity of main transformer protection and the reliability of action greatly.
Claims (2)
1. current transformer; It is characterized in that: it has the iron core of a closure; Iron core is provided with a winding and 4 secondary winding; Wherein, one time winding is connected with main transformer low-pressure side circuit, and 4 secondary winding are connected with measurement loop respectively, measure loop, backup protection loop and differential protection loop.
2. current transformer as claimed in claim 1 is characterized in that: the accurate progression of said 4 secondary winding is respectively 0.2 grade, 0.5 grade, 10P20 level and 10P20 level.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 201120419620 CN202268244U (en) | 2011-10-29 | 2011-10-29 | Current transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 201120419620 CN202268244U (en) | 2011-10-29 | 2011-10-29 | Current transformer |
Publications (1)
Publication Number | Publication Date |
---|---|
CN202268244U true CN202268244U (en) | 2012-06-06 |
Family
ID=46159029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 201120419620 Expired - Fee Related CN202268244U (en) | 2011-10-29 | 2011-10-29 | Current transformer |
Country Status (1)
Country | Link |
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CN (1) | CN202268244U (en) |
Cited By (3)
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 |
CN104701003A (en) * | 2015-03-24 | 2015-06-10 | 山东钢铁股份有限公司 | Electric connection loop of current transformer |
CN108776252A (en) * | 2018-04-12 | 2018-11-09 | 山东钢铁股份有限公司 | The metering secondary current circuit of main transformer |
-
2011
- 2011-10-29 CN CN 201120419620 patent/CN202268244U/en not_active Expired - Fee Related
Cited By (5)
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 |
CN104701003A (en) * | 2015-03-24 | 2015-06-10 | 山东钢铁股份有限公司 | Electric connection loop of current transformer |
CN108776252A (en) * | 2018-04-12 | 2018-11-09 | 山东钢铁股份有限公司 | The metering secondary current circuit of main transformer |
CN108776252B (en) * | 2018-04-12 | 2024-05-28 | 山东钢铁股份有限公司 | Metering secondary current loop of main transformer |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C17 | Cessation of patent right | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120606 Termination date: 20121029 |