Trihal Cast resin transformer up to 36kV
Key attributes
| Brand | Schneider |
| Model NO. | Trihal Cast resin transformer up to 36kV |
| Rated voltage | 12/17.5kV |
| Series | Trihal |
Product descriptions from the supplier
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
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Related Knowledges
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Neutral point grounding operation mode for 110kV～220kV power grid transformersThe arrangement of neutral point grounding operation modes for 110kV～220kV power grid transformers shall meet the insulation withstand requirements of transformer neutral points, and shall also strive to keep the zero-sequence impedance of substations basically unchanged, while ensuring that the zero-sequence comprehensive impedance at any short-circuit point in the system does not exceed three times the positive-sequence comprehensive impedance.For 220kV and 110kV transformers in new constructi01/29/2026 -
Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr01/29/2026 -
Why Must a Transformer Core Be Grounded at Only One Point? Isn't Multi-Point Grounding More Reliable?Why Does the Transformer Core Need to Be Grounded?During operation, the transformer core, along with the metal structures, parts, and components that fix the core and windings, are all situated in a strong electric field. Under the influence of this electric field, they acquire a relatively high potential with respect to ground. If the core is not grounded, a potential difference will exist between the core and the grounded clamping structures and tank, which may lead to intermittent discharge.I01/29/2026 -
Understanding Transformer Neutral GroundingI. What is a Neutral Point?In transformers and generators, the neutral point is a specific point in the winding where the absolute voltage between this point and each external terminal is equal. In the diagram below, pointOrepresents the neutral point.II. Why Does the Neutral Point Need Grounding?The electrical connection method between the neutral point and earth in a three-phase AC power system is called theneutral grounding method. This grounding method directly affects:The safety, reliabilit01/29/2026
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