Continued from first part: High Voltage Substations Overview (part 1)
Transformers are used for the transformation of high and medium voltage to low voltage, flanked by specific protective devices and control systems, which constitute the low voltage distribution substations.
A distribution substation, is characterized by the apparent power of the transformer and whether it is aerial, terrestrial or underground.
The indoor substations (terrestrial or underground), are manufactured in specific areas to ensure waterproofing and adequate ventilation. Among the equipment of high and low voltage, special protective grids (cells) shall be inserted and the transformer is protected by a special cover.
The arrival and departure of electric lines may be:
- Aerial (with bare conductors) or
- Underground (with reinforced cables)
The following example refers to a terrestrial distribution station:
1. Floor plan and incision of a terrestrial distribution substation
2. Single line schematic arrangement
3. Analytical (three-pole) schematic diagram
High Voltage Substation At Rockville Indiana (VIDEO)
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- SIEMENS Substations Guide
- Andreas Goutis, ‘Electrical drawing, Part 1’