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Abstract
The basis of the design of the oil system of a H.V. oil
filled cable circuit is considered in particular the choice of oil
feed locations along the cable route.
Methods are established for determining the oil pressure
tank requirements and the oil pressure response on application of
step or pulse loads for typical oil sections of a single core H.V.
oil filled cable circuit.
These methods are applied to an existing 132 KV installation
and minimum oil pressure tankage requirements and the maximum and
minimum transient oil pressures considering various loading conditions
determined. To establish the minimum transient oil pressure the oil
pressures occurring on switching off various continuous loads are
compared to that occurring on switching off load shortly after having
switched on.
Recommendations are made for similar circuits based on the
loading condition giving the minimum transient oil pressure. Possible
ways of verifying the theoretical methods and en electrical analogue
of the oil system are considered.