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, Thirumurthy
- Field Testing and Condition Assessment of MV Power Cable System by Very Low Frequency (VLF) AC Testing
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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).
- Fire-Resistant Cables- Heat Release Measurements
Abstract Views :67 |
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Authors
Affiliations
1 Central Power Research Institute, Bangalore - 560080, Karnataka, IN
1 Central Power Research Institute, Bangalore - 560080, Karnataka, IN
Source
Power Research, Vol 18, No 1 (2022), Pagination: 1-7Abstract
Fire Resistant cables are designed to maintain the circuit integrity of the cable even during fire conditions. In general, the fire-resistant cables are made up of flame retardant zero halogen materials, so that the fire hazard such as flame propagation and smoke release of these cables are controlled. However, one more fire hazard of these fire-resistant cables is nothing but the heat released from these cables during a fire. Heat release of these cables depends upon the fuel loading of the cables and the energy available in the materials of these Fire Resistant or Fire Survival (FS) cables. In this paper, the heat release of FS cables is measured for various construction of the FS cables.Keywords
Fire Resistant Cables, Glass-Mica Insulation, Heat Release, Silicone Insulation.References
- BS 6387 - Test method for resistance to fire of cables required to maintain circuit integrity under fire conditions
- IEC 60331 - Tests for electric cables under fire conditions - Circuit integrity
- BS 8491 - Method for assessment of fire integrity of large diameter power cables for use as components for smoke and heat control systems and certain other active fire safety systems
- IS 17505 - Specification for Thermosetting Insulated Fire Survival Cables for Fixed Installation having Low Emission of Smoke and Corrosive Gases when Affected by Fire for Working Voltages upto and including 1100 Vac and 1500 Vdc
- BS EN 50200 - Method of test for resistance to fire of unprotected small cables for use in emergency circuits.
- Pre Qualification Test on 220 KV Cable System – CPRI Experience
Abstract Views :74 |
PDF Views:0
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: 13-17Abstract
With the development of XLPE cables and associated accessories up to 500 kV voltage level, XLPE Cable Systems are becoming the main back bone of the Power Distribution and Transmission system. The basic requirement of power cable is that it shall withstand the electrical, thermal, mechanical and environmental stresses imposed on it during its expected life of 25 to 35 years. Generally the development of cable for EHV applications is achieved through increased stress design, which demands very stringent quality requirements during production of cables and development of accessories. Since different designs are available for cables and accessories, it is essential to carry out long duration test to establish their compatibility and reliability. IEC 62067 for extra High voltage Cable accessories have incorporated the pre-qualification tests to check the long term reliability of the cable system in service before installation. This paper highlights the details of Pre qualification test on 220 KV Cable system conducted at CPRI for the first time in India.Keywords
EHV XLPE Cable, Electrical Stresses, Mechanical Stresses, Pre Qualification Test, Thermal StressesReferences
- IEC 62067-2011 -Power cables with extruded insulation and their accessories for rated voltages above 150 kV (Um = 170 kV) up to 500 kV (Um = 550 kV) – Test methods and requirements.
- IEC 60840-2020 - Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV) – Test methods and requirements.
- Rao BN. Power cables laboratory “contribution towards research and testing in the CPRI golden jubilee period. 2011.
- Jahromi AN. Load cycling test of high voltage cables and accessoires. IEEE Electrical Insulation Magazine. 2011; 27(5):14–28.