CN201852924U - Polarity relationship inspecting device for differential protection current of electric motor - Google Patents

Polarity relationship inspecting device for differential protection current of electric motor Download PDF

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Publication number
CN201852924U
CN201852924U CN2010205841706U CN201020584170U CN201852924U CN 201852924 U CN201852924 U CN 201852924U CN 2010205841706 U CN2010205841706 U CN 2010205841706U CN 201020584170 U CN201020584170 U CN 201020584170U CN 201852924 U CN201852924 U CN 201852924U
Authority
CN
China
Prior art keywords
input end
wiring terminal
connection terminal
electric motor
differential protection
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 - Lifetime
Application number
CN2010205841706U
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Chinese (zh)
Inventor
袁鹏
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.)
MCC Tiangong Group Corp Ltd
China Second Metallurgy Group Co Ltd
Original Assignee
MCC Tiangong Group Corp 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 MCC Tiangong Group Corp Ltd filed Critical MCC Tiangong Group Corp Ltd
Priority to CN2010205841706U priority Critical patent/CN201852924U/en
Application granted granted Critical
Publication of CN201852924U publication Critical patent/CN201852924U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model provides a polarity relationship inspecting device for the differential protection current of an electric motor. Two ends of a current transformer at the front end of the electric motor are respectively connected with input ends of a wiring terminal A and a wiring terminal B; the output end of the wiring terminal A is connected with the input end of an ammeter A1; the output end of the wiring terminal B is connected with the input end of an ammeter A2; two ends of the current transformer at the rear end of the electric motor are respectively connected with input ends of a wiring terminal C and a wiring terminal D; the output end of the wiring terminal C is connected with the input end of the ammeter A2; the output end of the wiring terminal D is connected with the input end of an ammeter A3; and the output ends of the ammeters A1, A2 and A3 are connected. The device adopts simple structure, is convenient to use in field debugging, is concise and saves manpower and the using quantity of instruments.

Description

Motor differential protection current polarity concerns testing fixture
Technical field:
The utility model belongs to a kind of motor checkout facility, and particularly a kind of motor differential protection current polarity concerns testing fixture.
Background technology:
Large-scale AC motor is widely used in the visual plant of departments such as mining, oil, chemical industry, refrigeration, power and metallurgy; the startup operation debugging of high capacity motor is very important; be related to the normal operation production of equipment; therefore need carry out differential protection to motor, and the current polarity of motor differential protection relation is the key of motor differential protection debugging.The present required metered quantity of inspection that the current polarity of motor differential protection is concerned is many, debug time long, efficient is lower.
Summary of the invention:
The purpose of this utility model just is to overcome above-mentioned the deficiencies in the prior art, and provides a kind of motor differential protection current polarity to concern testing fixture, and this device is easy to use in debugging at the scene, succinctly saves the usage quantity of manpower and instrument.
As above design, the technical solution of the utility model is: a kind of motor differential protection current polarity concerns testing fixture, it is characterized in that: the current transformer two ends that are positioned at the motor front end are connected with the input end of connection terminal B with connection terminal A respectively, the output terminal of connection terminal A is connected with the input end of reometer A1, and the output terminal of connection terminal B is connected with the input end of reometer A2; The current transformer two ends that are positioned at motor rear end are connected with the input end of connection terminal D with connection terminal C respectively, and the output terminal of connection terminal C is connected with the input end of reometer A2, and the output terminal of connection terminal D is connected with the input end of reometer A3; The output terminal of reometer A1, A2 and A3 links to each other.
The utility model is simple in structure, and is easy to use in the debugging at the scene, succinctly saves the usage quantity of manpower and instrument.
Description of drawings:
Fig. 1 is a synoptic diagram of the present utility model.
Embodiment:
As shown in the figure: a kind of motor differential protection current polarity concerns testing fixture, the current transformer two ends that are positioned at the motor front end are connected with the input end of connection terminal B with connection terminal A respectively, the output terminal of connection terminal A is connected with the input end of reometer A1, and the output terminal of connection terminal B is connected with the input end of reometer A2; The current transformer two ends that are positioned at motor rear end are connected with the input end of connection terminal D with connection terminal C respectively, and the output terminal of connection terminal C is connected with the input end of reometer A2, and the output terminal of connection terminal D is connected with the input end of reometer A3; The output terminal of reometer A1, A2 and A3 links to each other.
Current value shown in reometer A1 and the A3 equates when two ends mutual inductor secondary connection polar relationship is correct, and current value shown in the reometer A2 is zero.Otherwise, only need switch any side secondary wiring of current mutual inductor and get final product.

Claims (1)

1. a motor differential protection current polarity concerns testing fixture, it is characterized in that: the current transformer two ends that are positioned at the motor front end are connected with the input end of connection terminal B with connection terminal A respectively, the output terminal of connection terminal A is connected with the input end of reometer A1, and the output terminal of connection terminal B is connected with the input end of reometer A2; The current transformer two ends that are positioned at motor rear end are connected with the input end of connection terminal D with connection terminal C respectively, and the output terminal of connection terminal C is connected with the input end of reometer A2, and the output terminal of connection terminal D is connected with the input end of reometer A3; The output terminal of reometer A1, A2 and A3 links to each other.
CN2010205841706U 2010-10-29 2010-10-29 Polarity relationship inspecting device for differential protection current of electric motor Expired - Lifetime CN201852924U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010205841706U CN201852924U (en) 2010-10-29 2010-10-29 Polarity relationship inspecting device for differential protection current of electric motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010205841706U CN201852924U (en) 2010-10-29 2010-10-29 Polarity relationship inspecting device for differential protection current of electric motor

Publications (1)

Publication Number Publication Date
CN201852924U true CN201852924U (en) 2011-06-01

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ID=44095312

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010205841706U Expired - Lifetime CN201852924U (en) 2010-10-29 2010-10-29 Polarity relationship inspecting device for differential protection current of electric motor

Country Status (1)

Country Link
CN (1) CN201852924U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107478943A (en) * 2017-08-09 2017-12-15 大唐东北电力试验研究所有限公司 Detect the method and device of differential protection for generator polarity
CN110221165A (en) * 2019-06-11 2019-09-10 安徽马钢设备检修有限公司 A kind of motor differential protection test new method
CN110554297A (en) * 2018-06-04 2019-12-10 中冶天工集团有限公司 method for checking differential protection current loop of large high-voltage motor by using low-voltage electricity

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107478943A (en) * 2017-08-09 2017-12-15 大唐东北电力试验研究所有限公司 Detect the method and device of differential protection for generator polarity
CN110554297A (en) * 2018-06-04 2019-12-10 中冶天工集团有限公司 method for checking differential protection current loop of large high-voltage motor by using low-voltage electricity
CN110221165A (en) * 2019-06-11 2019-09-10 安徽马钢设备检修有限公司 A kind of motor differential protection test new method
CN110221165B (en) * 2019-06-11 2021-03-26 安徽马钢设备检修有限公司 Novel motor differential protection test method

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CX01 Expiry of patent term
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Granted publication date: 20110601