IG-245-EN version 05; 13/02/2020
7
General Instructions
mb
.m
Description and main characteristics
1.1.2. Power transformer
[2]
4 MVA in the case of
mb
.m
with low voltage outputs. Approximate maximum power for
Ormazabal
transformers, in accordance with the
weight, dielectric volume and maximum admissible dimensions of the transformer set out in chapter “Mechanical ratings” of this document.
Check with
Ormazabal
for solutions for diff erent transformer brands or higher powers.
A 5 MVA
[2]
maximum power transformer is placed on the
metal frame, in accordance with Standard IEC 60076-1,
hermetically sealed completely fi lled with dielectric fl uid.
See general instructions document
IG-168
(up to
3150 kVA) or
IG-287
(> 3150 kVA).
For other options, please contact
Ormazabal
.
1.1.3. Low voltage switchgear
Up to four outdoor enclosures are assembled on the metal
frame, housing the low voltage switchgear to connect the
string inverter cables. This switchgear consists of, among
other elements, enclosed vertical three-pole bases with
diff erent rated currents.
For operation and maintenance, see the technical
datasheet supplied with the low voltage switchgear.
1.1.4. Metal frame
The metal frame supports the whole switchgear and allows
it to be handled as well as pulled. The frame is made of
folded hot-dip galvanised profi les of diff erent thicknesses
and structural profi les.
There are two types of frame, in accordance with the power
of the transformer, housing:
• <2500 kVA
• ≥2500 kVA
An additional bracket will be included for the low voltage
switchgear model.
