Product at a glance

Cast resin, 50 Hz, three-phased distribution transformers with the following
characteristics:

• Indoor use / Outdoor use with properly designed enclosure
• Thermal class F - Temperature rise 100
• Ambient ≤ 40°C, altitude ≤ 1000 m
• MV windings encapsulated in cast resin
• Pre-impregnated LV windings
• Natural air cooling system (AN type)
• Core and frame covered with protective coating
• Anti-corrosion surface treatment : corrositivity category class C2, “Medium”
  durability (according to ISO 12944-2)

The components of the products

Compliance:
These transformers comply with standards:

• IEC 60076-11
•  EN 50588-1
  

Schneider Electric guarantees that its
transformers are silicone free and certified:

•  C3* Climatic class
•  E3 Environment class according to IEC 60076-16
• F1 Fire behaviour class
• Almost partial discharge free -Acceptance level:
• ≤ 10 pC Routine Test
  - ≤ 5 pC Special Test according to
  IEC 60076 standard
  * C2 Thermal shock test carried out at -50°C

Trihal
Up to 3150 kVA, 12 kV, losses

Main electrical characteristics 

Dimensions* and weights

Without enclosure (IP00) 

With IP31 metal enclosure

Trihal
Up to 3150 kVA, 17.5 to 24 kV, losses

Main electrical characteristics 

Dimensions* and weights

Without enclosure (IP00) 

With IP31 metal enclosure

Trihal
Up to 3150 kVA, 36 kV, losses

Main electrical characteristics 

Dimensions* and weights

Without enclosure (IP00) 

With IP31 metal enclosure

All available Trihal technical range

Trihal
Options and accessories 

High voltage surge arresters

If the installation is likely to be subjected to overvoltage of any kind (atmospheric
or switching), the transformer must be protected by phase-to-earth surge
arresters, installed directly on the transformer’s HV connection terminals (either at
the top or the bottom).
It is essential to install these surge arresters:

•  where the lightning impact level Nk is greater than 25. The risk of direct or
  induced atmospheric overvoltage is directly proportional to Nk
•  during occasional switching (less than 10 operations a year) of a transformer
  with a weak load, or during a magnetization phase.
  It is also highly recommended to install them:
  where the substation is supplied by a network including overhead parts, then a
  cable longer than 20 m (case of an overhead-underground network)
  Surge arresters can be installed in an IP 31 enclosure, or even on existing
  equipment, provided that insulation distances are adhered to. 

                            High voltage surge arresters on the lower part

Vibration damping
Roller anti-vibration pads
This accessory, placed under the rollers, avoids vibrations being transmitted from
the transformer to its environment.
Damper unit
This device is installed instead of the roller and enables transmission of vibrations
to the transformer environment to be attenuated.

            Anti-damping accessories 

Protective Enclosure

The IP and IK protective indices refer to the following criteria:

IP protection indices

          Protective enclosure IP31, IK7