CN106707119A - Insulation detection method for large- scale motor bearing - Google Patents

Insulation detection method for large- scale motor bearing Download PDF

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Publication number
CN106707119A
CN106707119A CN201611202666.0A CN201611202666A CN106707119A CN 106707119 A CN106707119 A CN 106707119A CN 201611202666 A CN201611202666 A CN 201611202666A CN 106707119 A CN106707119 A CN 106707119A
Authority
CN
China
Prior art keywords
insulation
bearing
motor
detection method
voltage
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.)
Pending
Application number
CN201611202666.0A
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Chinese (zh)
Inventor
崔海
李庆民
杨庆文
孟秀芬
蔡美霞
刘海波
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.)
China Second Metallurgy Group Co Ltd
Original Assignee
China Second Metallurgy Group 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 China Second Metallurgy Group Co Ltd filed Critical China Second Metallurgy Group Co Ltd
Priority to CN201611202666.0A priority Critical patent/CN106707119A/en
Publication of CN106707119A publication Critical patent/CN106707119A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing

Abstract

The invention relates to an insulation detection method for a large- scale motor bearing. The insulation detection method is characterized by comprising the steps of: adopting an AC voltmeter for measurement at a rated rotation speed of a motor; measuring a voltage U1 between rotor shaft ends firstly; and short-circuiting oil films of two bearings at the rotor shaft ends, and measuring a voltage U2 between each bearing and a motor substrate. If the measurement result U1 is equal to U2, the condition indicates that the insulation is good. If the U2 is less than a numerical value of the U1, the condition indicates that the insulation is poor. The insulation detection method has the advantages of being capable of detecting insulation states of the bearings in a motor trial running state, making the detection more reliable, and being more practical.

Description

The insulation detecting method of large-size machine bearing
Technical field
The present invention relates to a kind of insulation detecting method of large-size machine bearing, belong to electric adjustment technical field.
Background technology
As shown in figure 1, the insulation detecting method of conventional large-size machine bearing is to exhausted using megameter by A, C test point Edge pad is detected that testing result meets code requirement.Shortcoming using the insulation detecting method of this conventional motor bearing is： 1) bearing insulation state can not be detected under trial operation state；2) the method is Static Detection means, it is impossible to which dynamic detection insulate State.
The content of the invention
It is an object of the invention to provide a kind of large-scale electricity that bearing insulation state can be detected under motor trial operation state The insulation detecting method of machine bearing.
Technical scheme is as follows：
Measured using A.C. voltmeter under Rated motor rotating speed, first measure the voltage U between rotor shaft end1, then by rotor After the oil film short circuit of the bearing of shaft end two, the voltage U between measurement bearing and motor base board2If, measurement result U1Equal to U2Say Bright insulation is good, if U2Less than U1Numerical value, illustrate defective insulation.
It is an advantage of the invention that：Bearing insulation state can be detected under motor trial operation state so that detection more may be used Lean on, with more practicality.
Brief description of the drawings
Fig. 1 is the detection principle diagram of the insulation detecting method of conventional large-size machine bearing；
Fig. 2 is the detection principle diagram that voltage between rotor shaft end is detected in detection method of the invention；
Fig. 3 be in detection method of the invention by the oil film short circuit of the bearing of rotor shaft end two after, measure bearing and motor The detection principle diagram of voltage between substrate.
In figure：ZOB---- megameters, JYD---- felt pads, the test point between A/C---- bearings and motor base board, Test point between M---- motors, JC---- motor base boards, V---- A.C. voltmeters, D/E---- rotors shaft end, V---- A.C. voltmeter, U1----first voltage measured value, U2----second voltage measured value.
Specific embodiment
Referring to the drawings 2,3, testing equipment is 0~10V A.C. voltmeters 1, is turned in Rated motor using A.C. voltmeter Motor bearings insulativity is detected under speed：
1) voltage U as shown in Figure 2 between measurement motor rotor shaft end1；
2) as shown in Figure 3 by the oil film short circuit of two bearings of rotor shaft end；
3) the voltage U between measurement bearing and motor base board2；
4) U is compared1And U2Numerical value, U1Equal to U2When explanation insulation it is good, U2Less than U1When, illustrate defective insulation, numerical value phase Difference is bigger, and insulativity is poorer, should carry out maintenance process.

Claims (1)

1. a kind of insulation detecting method of large-size machine bearing, it is characterized in that：A.C. voltmeter is used under Rated motor rotating speed Measurement, first measures the voltage U between rotor shaft end1, then by the short circuit of the oil film of the bearing of rotor shaft end two after, measure bearing and motor Voltage U between substrate2If, measurement result U1Equal to U2Illustrate that insulation is good, if U2Less than U1Numerical value, illustrate insulation not It is good.
CN201611202666.0A 2016-12-23 2016-12-23 Insulation detection method for large- scale motor bearing Pending CN106707119A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611202666.0A CN106707119A (en) 2016-12-23 2016-12-23 Insulation detection method for large- scale motor bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611202666.0A CN106707119A (en) 2016-12-23 2016-12-23 Insulation detection method for large- scale motor bearing

Publications (1)

Publication Number Publication Date
CN106707119A true CN106707119A (en) 2017-05-24

Family

ID=58903037

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611202666.0A Pending CN106707119A (en) 2016-12-23 2016-12-23 Insulation detection method for large- scale motor bearing

Country Status (1)

Country Link
CN (1) CN106707119A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112327036A (en) * 2020-11-02 2021-02-05 山东中实易通集团有限公司 Shaft voltage tester and method

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CN1233325A (en) * 1996-06-24 1999-10-27 阿塞里克有限公司 Model-based fault detection system for electric motors
CN1210268A (en) * 1998-04-23 1999-03-10 中国科学院等离子体物理研究所 Method for insulation inspecting and ground protecting for windings of D. C. motor armature
CN102707152A (en) * 2012-06-04 2012-10-03 西南交通大学 On-line detecting device for resistance value of resistance winding machine
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CN104833839A (en) * 2015-05-21 2015-08-12 中国大唐集团科学技术研究院有限公司华东分公司 Device for detecting whether grounding fault happens to non-grounding end of motor rotor shaft or not
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CN204925215U (en) * 2015-07-30 2015-12-30 龙源（北京）风电工程技术有限公司 On line measurement device of generator shaft voltage among measurement wind turbine generator system
CN105277861A (en) * 2015-11-19 2016-01-27 南车株洲电机有限公司 Method for testing motor bearing dielectric strength
CN105699081A (en) * 2016-01-21 2016-06-22 湖南科技大学 Bearing shaft current damage comprehensive performance test device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112327036A (en) * 2020-11-02 2021-02-05 山东中实易通集团有限公司 Shaft voltage tester and method

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Application publication date: 20170524