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Raja, G. K.
- Ampacity of bundled PVC house wiring cables in a conduit pipe based on experimental and theoretical considerations
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Affiliations
1 Diagnostic, Cables and Capacitors Division, Central Power Research Institute, Bangalore-560 080, IN
1 Diagnostic, Cables and Capacitors Division, Central Power Research Institute, Bangalore-560 080, IN
Source
Power Research, Vol 10, No 4 (2014), Pagination: 723-730Abstract
Flexible PVC Cables form the major part of Power distribution system within residential buildings, industrial buildings, and other commercial institutions. The ampacity of power cable depends upon the cross sectional area of conductor and the laying and installation of the cable in service. Generally two or more number of PVC cables are bundled together and inserted as a bundle in a conduit pipe for connecting to various load points. As the bundling of cables produce more heat than a single PVC Cable, and dissipation of heat is poor, the ampacity of these cables reduces considerably. Hence the exact selection of sizes and no. of cables are essential to avoid overheating of those cables and the resulting fire havocs.PVC House wiring cables consists of copper conductor extruded with PVC insulation and are installed generally through a conduit pipe in a bundled manner. The steady state current rating of these cables depends on the way the heat generated in the cable due to current and the heat transmitted to the cable surface & then dissipated to the surroundings. The maximum conductor temperature is limited by the type of insulating material used. In this paper theoretical and experimental results of steady state ampacity ratings of bundles of house wiring PVC Cables laid in conduit pipes are compared.
Keywords
Ampacity, house wiring cables- Recent Advances in HV and EHV Power Cable Technology - CPRI’s Experience in Qualifi cation Tests on Power Cables
Abstract Views :197 |
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Authors
Affiliations
1 Central Power Research Institute, Bangalore-560080, IN
1 Central Power Research Institute, Bangalore-560080, IN
Source
Power Research, Vol 8, No 4 (2012), Pagination: 251–262Abstract
Over the years both due to demand and technological advancements there has been a continuous transition from smaller operating voltages of 6.6. kV to higher voltages of 500 kV. The conventional technology like taping or fi eld moulding are in vogue and new technology like pre-moulded slip on cable accessories are gaining importance for jointing of polymeric high voltage cables up to voltages of 500 kV. The fl ammability characteristics of polymeric materials used in cable insulation and jacketing have been of great importance over the years. Evaluation techniques have become more stringent and both short term and long term tests are conducted in order to ensure the quality of materials used, the manufacturing processes, workmanship and reliability. In this paper the recent advances in HV and EHV power technology is summarized and the experiences in testing and evaluation of 220 kV cables is presented and discussed.Keywords
Taping, Pre-moulded slip, High voltage (HV), Extra high voltage (EHV) polymeric cables.- Flame Retardancy of Instrumentation and Control Cables – CPRI’s Experience
Abstract Views :235 |
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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: 121-125Abstract
In this paper the fire and smoke properties of special application cables such as instrumentation cables, control cables, fibre optic cables and flat travelling cables are compared for their better fire performance. The various outer sheath materials of these cables have been evaluated for its fire performance and as well as smoke performance. In case of zero halogen outer sheath materials of special application cables, only the smoke property is given importance and the fire retardant properties are not being given much importance. Hence the significance of fire retardant property is highlighted in this study.Keywords
Flammability, Halogen, Instrumentation Cable, Smoke Release, LSZHReferences
- Arunjothi R, Jayakrishnan M, Nageshwar Rao B. Characterization and analysis of cable and accessories materials,9th International Conference on Power Cables “CABLETECH-2017”.
- Rao BN, Arunjothi R. Lethal Combustion product evaluation of polymeric materials used in power cables, 9th International Conference on Insulated Power Cables, Jicable’15-21-25 June 2015.
- Nageshwar Rao B, Arunjothi R, Srinivasan AR. Assessing Smoke and Fire Hazard of Burning Electric Cables, IEEE10th International Conference on the Properties and Application of Dielectric Materials, ICPADM 2012.
- Pre Qualification Test on 220 KV Cable System – CPRI Experience
Abstract Views :78 |
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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: 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.