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Sharma, Rajat
- Condition Assessment Techniques for Insulation Diagnosis of Oil Filled Power Transformers
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Authors
Affiliations
1 Central Power Research Institute (CPRI), Bengaluru – 560080, Karnataka, IN
1 Central Power Research Institute (CPRI), Bengaluru – 560080, Karnataka, IN
Source
Power Research, Vol 14, No 2 (2018), Pagination: 126-131Abstract
Power transformers are key components in the substation/switchyard and failure of transformer can have an enormous impact on reliability and availability of power supply and has financial implications. As there is ever increase in demand of power, the reliability of power equipment assumes high importance. Economic factors are the main consideration and in order to minimize capital expenditure on new equipment, it is a common policy among utilities to maximize the use of existing power transformers by operating at their design capability. This can be achieved by periodic diagnostic testing and adopting condition based maintenance practices. In this paper various condition assessment techniques for oil filled transformers are discussed and few case studies are presented.Keywords
Condition Assessment, Generator Transformer, Insulation Diagnosis, SFRA
References
- Chakravorti S, Dey D, Chatterjee B. Recent trends in the condition monitoring of transformers-theory, implementation and analysis.
- IEEE Std. 62-1995 IEEE guide for diagnostic field testing of electric power apparatus-Part1 oil filled transformers, regulators and reactors. IEEE Xplore Digital Library; 1995 Dec 1.
- IEC Std. 60076-18, power transformer Part-18: Measurement of frequency response. International Electrotechnical Commission (IEC); 2012 Jul.
- Lifetime Evaluation of transformers. CIGRE Working Group 12.09; 1993.
- Pradhan MK, Ramu TS. On estimation of elapsed life of oil-immeresed power transformers. IEEE Transactions on Power Delivery. 2005; 20(3):1962–9.
- Field Testing and Condition Assessment of MV Power Cable System by Very Low Frequency (VLF) AC Testing
Abstract Views :312 |
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Authors
Affiliations
1 Cables and Diagnostics Division, Central Power Research Institute, Bangalore – 560080, Karnataka, IN
1 Cables and Diagnostics Division, Central Power Research Institute, Bangalore – 560080, Karnataka, IN
Source
Power Research, Vol 16, No 2 (2020), Pagination: 187-192Abstract
A huge capital investment goes for power cables in an electric power system. Reliability and life expectancy of serviceaged power cables can be assured by systematic field testing and condition assessment program. Very Low Frequency (VLF) ac Testing proved effective for field testing and condition assessment of shielded Power Cable System. Central Power Research Institute (CPRI), Bengaluru, a premier institute for Indian Power Sector has been conducting diagnostic testing on medium voltage power cable systems to assess the healthiness of the power cable systems and cable system components. In this paper application of VLF testing for withstand and other diagnostic tests and measurements are discussed. Few case studies based on the data obtained from the field testing on MV Power Cable System are presented.Keywords
Very Low Frequency (VLF), VLF Dielectric Spectroscopy (VLF-DS), VLF Differential Tangent Delta (VLF-DTD), VLF Monitored Withstand Test (VLF-MW), VLF Partial Discharge (VLF-PD),VLF Tangent Delta (VLF-TD), VLF Tangent Delta Temporal Stability (VLF-TDTS).References
- Puhan DK, Keri CD, Rao BN. CPRI experience in diagnostic testing and condition assessment of medium voltage power cable system.
- Mallikarjunappa K, Ramaprasath S, Keri CD, Sudhindra A. CPRI, Bangalore, Very low frequency tan delta testing and condition assessment of medium voltage polymeric cables.
- IEEE Std 400.2TM-2013, IEEE guide for field testing of shielded power cables using very low frequency (less than 1Hz).
- An Approach to Determine Health Index of Power Cable System
Abstract Views :67 |
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Authors
Affiliations
1 Central Power Research Institute, Bengaluru - 560080, Karnataka, IN
1 Central Power Research Institute, Bengaluru - 560080, Karnataka, IN
Source
Power Research, Vol 18, No 1 (2022), Pagination: 9-12Abstract
Power Cable System is a vital asset in Electrical Power System. Now a days power cables are used in transmission and distribution of electric power at MV, HV and EHV levels. Reliability and availability of power supply depends greatly on insulation condition of the power cable system. Therefore, power cable asset management is vital for taking decision on future course of action to minimize capital expenditure, maximize reliability and avoid forced outages. In this paper, how to deploy power cable asset management is discussed using Health Index based on diagnostic test data.Keywords
: Asset Management, Condition Assessment, Diagnostic Testing, Health IndexReferences
- IEEE Std 400-2012, IEEE Guide for Field Testing and Evaluation of the insulation of the Shielded Power Cable System.
- IEEE Std 400.2-2013, IEEE Guide for Field Testing of the Shielded Power Cable System Using Very Low Frequency (VLF) (less than 1 Hz).
- IEEE Std 400.3-2006, IEEE Guide for Partial Discharge Testing of the Shielded Power Cable System in a Field Environment.
- IEEE Std 400.4-2015, IEEE Guide for Field Testing of the Shielded Power Cable System Rated 5 kV and Above with Damped Alternating Current (DAC) Voltage.
- Puhan DK, et al. CPRI Experience in Diagnostic Testing and Condition Assessment of Medium Voltage Power Cable System. 14th Doble Power Forum; 2016
- Puhan DK, et al. On-Site Partial Discharge Diagnosisof Power Cables-Case Studies and Field Experiences. CABLETECH; 2017
- Rao NB, Puhan DK, Sharma R. Dielectric diagnosis of extruded cable insulation by very low frequency and spectroscopy
- techniques- A few case studies. Power Research- A Journal of CPRI. 2018; 14(2) https://doi.org/10.33686/pwj.v14i2.144708
- Puhan DK, et al. Field testing and condition assessment of MV power cable system by Very Low Frequency (VLF) AC Testing. Power Research Journal of CPRI. 2020; 16(2).
- https://doi.org/10.33686/pwj.v16i2.155908