Question
Download Solution PDFIn case of underground cables, the screened cables are used for voltages:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- In practice, underground cables are generally required to deliver 3-phase power. For the purpose, either three-core cable or three single-core cables may be used.
- For voltages upto 66 kV, 3-core cable (i.e., multi-core construction) is preferred due to economic reasons.
- However, for voltages beyond 66 kV, 3-core-cables become too large and unwieldy and, therefore, single-core cables are used.
- Belted cables — up to 11 kV
- Screened cables — from 22 kV to 66 kV
- Pressure cables — beyond 66 kV.
The following types of cables are generally used for 3-phase service:
Screened cables: These cables are meant for use up to 33 kV, but in particular cases, their use may be extended to operating voltages up to 66 kV. Two principal types of screened cables are H type cables and S.L. type cables.
Last updated on Apr 18, 2023
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