IG-287-EN version 03; 24/07/2020
4
Description and main characteristics
General Instructions
transforma
.plur: Transformers with corrugated tank
and submerged in dielectric liquid from 3150 kVA
1. Description and main characteristics
1.1. Design, manufacturing and testing
[2]
Medium voltage electro-technical regulations applicable when the transformer was manufactured.
Ormazabal
's transformers have been designed and
constructed in accordance with the mandatory standards.
They meet the testing requirements of the current medium
voltage electro-technical regulations
[2]
, as well as customer
specifications, in particular.
Figure 1.1.
Detail of
transforma
.plur
elements
More specifically, apart from the mineral oil-immersed
transformers, the
organic
transformer range is characte-
rised by its use of natural biodegradable ester as a dielectric
liquid, with the following general characteristics:
•
Excellent dielectric properties
, with a high water
saturation point, which allows it to maintain high
dielectric rigidity values with a high water content.
•
High fire resistance
: natural dielectric ester is
classified as a K class liquid (fire point > 300 ºC)
according to Standard IEC 61100. This classification
offers the possibility of avoiding having to install
fixed fire extinguishing systems, according to many of
the medium voltage electro-technical regulations of
different countries.
•
High biodegradability
in soils and water due to its
natural composition.
• It is
not
ecotoxic
.
•
Recyclable and reusable
in other favourable environ-
mental products at the end of its service life.
1.2. Individual or routine tests
The transformers are subjected to routine tests, which
guarantee compliance with the applicable standards:
• Winding resistance measurement.
• Transformation ratio measurement and vector group
check.
• Measurement of load losses and short-circuit impedance.
• Measurement of losses and no-load current.
• Power frequency applied voltage test.
• Induced voltage test.
1.3. Test protocol
All the information regarding the transformer tests is
recorded in the Test Protocol enclosed with the transformer
documentation.
