Research on On-Line Monitoring Method of Cable Insulation Based on Signal Injection

For improving reliable operation of switchgear in power system, an approach for on-line monitoring the insulation characteristic and bus-bar temperature rising of the switchgear is proposed in this paper. Through comparing several existing temperature measurement methods for monitoring temperature rising elevation at bus-bas, a new design of temperature monitoring method is proposed. It adopts quick-magnetic saturated current transformer, temperature sensor and infrared transmission to solve the problem of high voltage isolation. The epoxy resin insulation material which is commonly used in switchgear its aging mechanism data is not complete, seriously restrict on-line monitoring for switchgear, so thousands hours of aging experiment is done on switchgear, systematic study various electrical characteristics variation law on the gradual aging process of epoxy resin insulation materials. Therefore, study on the aging characteristics of switchgearinsulation and its lifetime estimation method is the key technology to understand agingmechanism better, search for new fault diagnostic method and the way to extend theuseful lifetime of switchgear. At last, the system runs in real system and the result shows the on-line monitoring system is stable and reliable which can be provide reference for on-line monitoring system design of switchgear.

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Application of improved on-line monitoring method using PMU data in recent European blackout

2016 International Conference on Condition Monitoring and Diagnosis (CMD) ◽

10.1109/cmd.2016.7757951 ◽

2016 ◽

Author(s):

Baojie Li ◽

Hongjie Li ◽

Weisheng He ◽

Bo Wei ◽

Shuo Chen ◽

...

Keyword(s):

Monitoring Method ◽

On Line

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A Novel Cable Insulation Monitoring Method Based on WAMS

2019 IEEE 2nd International Conference on Electronics Technology (ICET) ◽

10.1109/eltech.2019.8839368 ◽

2019 ◽

Author(s):

Yong-mei Zhao ◽

Ming Qiu ◽

Juntong Zhao

Keyword(s):

Monitoring Method ◽

Cable Insulation ◽

Insulation Monitoring

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Method for Evaluating Machining Toolholder-Spindle Unbalance Due to Chips at the Toolholder Interface

ASME 2010 International Manufacturing Science and Engineering Conference, Volume 1 ◽

10.1115/msec2010-34232 ◽

2010 ◽

Author(s):

John Agapiou

Keyword(s):

Real Time ◽

Process Monitoring ◽

Diagnostic System ◽

Machining Process ◽

Monitoring Method ◽

Spindle System ◽

On Line

Machining process monitoring method is developed for detecting and diagnosis of the presence of chips at the toolholder-spindle interface. Although toolholders can be simply balanced before they are placed in the spindle, there can be some balancing problems remaining when one or more loose machining chips are attached at the toolholder-spindle interface(s) during a tool change. A method is developed by considering the natural and geometric unbalances of the toolholder-spindle system combined with an analysis of the toolholder tilt due to the presence of loose machining chips around the spindle. The method can be integrated on-line as a real-time expert diagnostic system for toolholder tilt due to the presence of loose machining chips at the spindle nose. The expert diagnostic system makes intelligent decisions on toolholder unbalance and concerns with chips at the interface that result in unwanted tilting and vibrations. The tool unbalance algorithm was able to monitor the toolholder tilting according to the results of this study.

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