Feeding devices and oil pressure signaling of cable oil-filled lines

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 2. Sewerage of electricity

Cable lines up to 220 kV. Feeding devices and oil pressure signaling of cable oil-filled lines

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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2.3.54. The oil feed system must ensure reliable operation of the line in any normal and transient thermal conditions.

2.3.55. The amount of oil in the oil feeding system should be determined taking into account the consumption for feeding the cable. In addition, there must be a supply of oil for emergency repairs and oil filling of the longest section of the cable line.

2.3.56. Feed tanks of low pressure lines are recommended to be placed indoors. A small number of feed tanks (5-6) at open food points are recommended to be placed in light metal boxes on portals, supports, etc. (at an ambient temperature of at least minus 30ºС). Make-up tanks must be equipped with oil pressure gauges and protected from direct sunlight.

2.3.57. Feeding units of high-pressure lines must be placed in enclosed spaces with a temperature not lower than +10ºС, and located as close as possible to the point of connection to cable lines (see also 2.3.131). Several feeding units are connected to the line through an oil manifold.

2.3.58. When laying several high-pressure oil-filled cable lines in parallel, it is recommended that each line be fed with oil from separate feeding units, or a device should be installed to automatically switch the units to one or another line.

2.3.59. Feeding units are recommended to be supplied with electricity from two independent power sources with a mandatory automatic transfer switch (ATS). Feeding units must be separated from one another by fireproof partitions with a fire resistance limit of at least 0,75 hours.

2.3.60. Each cable oil-filled line must have an oil pressure alarm system that provides registration and transmission to duty personnel of signals about a decrease and increase in oil pressure in excess of permissible limits.

2.3.61. At least two sensors must be installed on each section of the low pressure oil-filled cable line, and a sensor on each feeding unit should be installed on the high pressure line. Emergency signals should be transmitted to a point with constant duty of personnel. The oil pressure alarm system must be protected from the influence of electric fields of power cable lines.

2.3.62. Feeding points on low pressure lines must be equipped with telephone communication with control points (power grids, network area).

2.3.63. The oil pipeline connecting the collector of the feeding unit with the high-pressure oil-filled cable line must be laid in rooms with a positive temperature. It is allowed to lay it in insulated trenches, trays, channels and in the ground below the freezing zone, provided that a positive ambient temperature is ensured.

2.3.64. Vibration in the room of the switchboard with devices for automatic control of the booster unit should not exceed the permissible limits.

See other articles Section Rules for the installation of electrical installations (PUE).

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