CN202268244U - Current transformer - Google Patents

Current transformer Download PDF

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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
Authority
CN
China
Prior art keywords
protection
loop
current transformer
transformer
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201120419620
Other languages
Chinese (zh)
Inventor
冀红伟
陈聪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd
Original Assignee
Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd filed Critical Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority to CN 201120419620 priority Critical patent/CN202268244U/en
Application granted granted Critical
Publication of CN202268244U publication Critical patent/CN202268244U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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

A kind of current transformer
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.
CN 201120419620 2011-10-29 2011-10-29 Current transformer Expired - Fee Related CN202268244U (en)

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
CN (1) CN202268244U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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