Velatia ORMAZABAL basic pfu Series - 3 Main Components; Indoor Switchgear; Prefabricated Concrete Enclosure

IG-032-EN version 05; 18/06/2019
6
Main components
General instructions
pfu basic range: Prefabricated concrete
enclosure, ground-level walk-in type
3. Main components
[2]
Number of pedestrian access doors to the transformer area in accordance with the pfu con guration.
The solutions based on Ormazabal's pfu buildings have
two main elements:
• Indoor switchgear.
• Prefabricated concrete enclosure.
3.1. Indoor switchgear
The switchgear is mounted in the enclosure, anchored to
it, and may be made up of one or several of the following
elements:
• Fully gas-insulated medium-voltage switchgear up to
40.5 kV.
• Medium-voltage/low-voltage full liquid dielectric- lled
distribution transformers.
• Low-voltage switchgear.
• Medium and low-voltage interconnections.
• Other control, metering and protection equipment.
• Interconnections between control, metering and
protection equipment.
For more information on these products, please contact
Ormazabal.
3.2. Prefabricated concrete enclosure
The prefabricated enclosure is made up of, amongst others,
the following elements:
• Prefabricated monoblock concrete body.
• Prefabricated removable concrete roof.
• Prefabricated concrete raised  oor.
• Liquid dielectric collection trench (optionally,  re barrier
based on a bed of pebbles).
• Pedestrian access door
[2]
(clear opening measuring
900 x 2100 mm or 1100 x 2100 mm), hinged 180º on
the outside wall. The door is  tted with a lock with two
anchor points and a holding pin to prevent unwanted
closing (optionally, anti-panic opening mechanism).
• Transformer area access door
[2]
(clear opening measuring
1260 x 2100 mm).
• Air input and output grilles for natural ventilation.
• Pre-punched holes for cable input and output at the
lower front and back of the enclosure (cable access
ori ces 200 mm in diameter).
• One 140 mm diameter hole above level 0 in the front
wall for an auxiliary low-voltage input.
• Two earthing protection switch boxes (metal part), and
an operational switch box (neutral).
• Lighting and auxiliary services (optional).
• The cable trench is made up of the bottom of the
monoblock body (1) and the raised  oor (2).
1
Body
2
Raised  oor
3
Roof
4
Pedestrian access doors
5
Transformer area access door
6
Ventilation grilles
7
Cable access
Figure 3.1. pfu main components