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Products -> Power
Distribution Transformers
-> Cast Resin Power Distribution Transformers
Carroll
& Meynell have established close links with European
manufacturers of Cast Resin Power Distribution Transformers, most
notably TESAR SRL of Italy
Cast
Resin Transformers offer a cost effective and convenient alternative to
the more traditional Oil Immersed high voltage distribution transformers
The
transformer itself consists of two types of winding. The high voltage
winding (3KV up to 36KV) is vacuum cast into an insulating resin that
completely seals it from the atmosphere. The low voltage winding (up to
690V) is wound with a pre-impregnated insulating paper that is heat
treated to bond the coil together. These two windings are then placed
concentrically on the legs of the transformers’ magnetic core.
Construction (link)
Cast
Resin / Oil Immersed comparison
Advantages
No
oil required
Low maintenance running costs
No requirement for oil spillage containment infrastructure
Disadvantages
In-door
applications only
Larger physical size
Initially larger purchase cost
Standards
Cast
Resin Transformers are built in accordance with IEC 60076 they meet the
following approval certifications
| Climatic |
C1 |
| Transformer
suitable for storage and operation in ambient down to -25°C |
Environmental
|
E2 |
| Suitable
for highly polluted environment with substantial condensation |
Fire
|
F2 |
| Self
extinguishing that does not give out toxic substances or matte smoke |
Factory
& Witness Testing (link)
Specifications
The
standard electrical specification is for a High Voltage to Low Voltage
delta to star step down transformer. However we can supply to a range
of electrical specification options
- Low
Voltage to High Voltage step up
- Full
Rated Dual High Voltage windings e.g. 11KV / 20KV
- Zig-Zag
interconnected star Low voltage vector groupings
- Dual
seconday outputs for Delta / delta-star vector group transformers
- K-Factor
rating to allow for harmonic content loading
As
standard the units are supplied with
- Primary
and Secondary Aluminium winding conductors.
(Copper conductors are available on request.)
- The
HV windings are supplied with ±2.5%, ±5% taps
The units are supplied with PT100 thermal monitoring sensors in each
coil and a programmable TSX1
Thermocontroller *
- Units
are supplied with wheels
In
addition to the transformer we can supply a range of accessories to
suit the needs of the installation, these include
*
Monitoring units are supplied loose for installation within the
switchgear panel
The
following tables covering standard production transformers up to
2,500KVA are for GUIDANCE ONLY,
raw material prices may affect design parameters so as to vary the
transformer dimensions and characteristics.
Details
are available on request for transformers with the following
specification requirements
- 36KV
transformers
- K-Factor
transformers
- Interconnected
Star transformers
- Dual
seconday outputs for Delta / delta-star vector group transformers
- Transformers
rated higher than 2,500KVA
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