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Nagesh Babu, D.
- Performance of Relays and Protection Equipment under Vibration Environment
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Authors
Affiliations
1 Central Power Research Institute, Bangalore – 560 080, Karnataka, IN
1 Central Power Research Institute, Bangalore – 560 080, Karnataka, IN
Source
Power Research, Vol 15, No 1 (2019), Pagination: 64-69Abstract
Relays are the protection and switching devices in most of the control processes or equipment. Relays respond to one or more electrical quantities like voltage or current such that they open or close the contacts or circuits. Relays are subjected to vibration and mechanical shock due to operating environment, transportation, mishandling and earthquake. Operating environmental vibration and shock may result in spurious operation of relays. Understanding cause and effect of vibration on relay performance is paramount to ensure reliable functioning of relays. Relays should be designed for the anticipated operating environmental vibration and shock levels. Vibration and shock qualification is performed to determine if a product can withstand the rigors of its intended use environment, to insure the final design will not fall apart during shipping, for environmental stress screening and to weed out production defects. CPRI is equipped with state-of-the-art facilities to qualify equipment and components for vibration and shock conditions. Performance of relay under vibration environment is discussed in this paper.Keywords
Resonance Frequency, Shock, Vibration.References
- IEC 60255 -21- 1. Electrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section One: Vibration tests (sinusoidal); 1988.
- IEC 60255 -21- 2. Electrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section Two: Shock and bump tests; 1988.
- IEC 60255-21-3. Electrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section 3: Seismic tests; 1993.
- Failure Analysis of Electrical Equipment under Operational Vibration
Abstract Views :77 |
PDF Views:0
Authors
Affiliations
1 Joint Director, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
2 Engineering Officer, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
3 Engineering Assistant, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
1 Joint Director, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
2 Engineering Officer, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
3 Engineering Assistant, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
Source
Power Research, Vol 17, No 1 (2021), Pagination: 37-43Abstract
Equipment is subjected to vibration due to operating environment, transportation, handling and earthquake. Vibration results in dynamic loading, wherein failure of equipment depends on magnitude and frequency content of vibration. Equipment should perform its desired function during and/or after the vibration. The need to understand the effects of vibration and shock on equipment reliability is paramount. Vibration qualification is performed to determine if a product can withstand the rigors of its intended use environment, to ensure the final design will not fall apart during shipping, for environmental stress screening to weed out production defects, or even as a form of accelerated stress testing. Vibration tests are commonly used to improve the reliability of instruments, sub components and equipment or a system. Earthquake is the natural disaster which results in three-dimensional ground vibrations. Failure analysis of electrical equipment subjected to operational vibration environment is presented in this paper.Keywords
Damping, Resonance Frequency, VibrationReferences
- IEC 61373: 2010. Railway applications - Rolling stock equipment - Shock and vibration tests.
- IS 1893 (Part 1): 2016 - Criteria for Earthquake Resistant Design of Structures.
- IEC 60068 -2- 6: 2007. Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal).
- IEC 60068 -2 -64: 2008. Environmental testing - Part 2 -64: Tests - Test Fh: Vibration, broadband random and guidance.
- Manjunath KB, Babu RR, Srinivasamurthy V, Hegde P, Selvam RP. Seismic and vibration qualification of equipment. Second International Conference on Vibration Engineering and Technology of Machinery; 2002.
- Jayahari L, Praveen G. Correlation of sinusoidal sweep test to field random vibrations. Department of Mechanical Engineering - Blekinge Institute of Technology, Sweden; 2005.
- IEC 60068-3-8:2003. Environmental testing - Part 3-8: Supporting documentation and guidance - Selecting amongst vibration tests.
- IEC 60068 -2 -57:2013. Environmental testing - Part 2-57: Tests - Test Ff: Vibration - Time-history and sine-beat method.
- IEC 60255 -21- 1: 1988. Electrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section one: Vibration tests (sinusoidal).