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-> 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
- Enclosures
- Rated IP21 or IP31
- Bolt on access panels or Hinged lockable door
panels
- Floor mounting or transformer mounting
- Choice of gland plate materials
- Pre-Punched fitting holes for High voltage
switches, Castell interlocks etc
- HV Terminal Box
- LV Terminal box
- LV Bar Work
- Cooling Fans to increase the transformer rating
by up to 40%
- TSX6
Fan Control unit
- Option for PTCR sensors with TSX3
Relay monitoring unit *
- Anti-vibration Pads
- High Voltage Terminal Protection e.g. Elastimould
fittings or Resin Pots
* 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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