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GRIDCON® Transformer

Product Description

The voltage regulated GRIDCON® Transformer is a distribution transformer based on Maschinenfabrik Reinhausen's decades of experience in voltage regulation for transformers.
It can be fitted in any compact station as it has the same dimensions as a non-regulated transformer. Its anticipated service life is no different from that of a non-regulated transformer and it remains maintenance-free over its entire life.

Technical Data

Winding material HV/LV Copper / Copper or Aluminium / Aluminium
Tank type Hermetic-corrugated tank
Cooling type ONAN
Max. ambient temperature 40°C
Max. installation altitude 1,000m over NN
Frequency 50Hz
Vector group Dyn5
Impedance voltage 4% 4%  4% or 6%       6%     
No load losses P0 Loss class A0, B0 or C0
Short circuit losses Pk Loss class Bk or Ck
Additional losses potential-equalisation

Dependent on configuration of tap changer between 0% and 5% of total
transformer losses

High voltage Selectable, max. 24kV voltage class


5, 7 or 9 on-load steps
Configuration selectable, e.g. +6/-2, +5/-3, +4/-4

Step voltage

Selectable, max. 600V, common 1,5%, 2% or 2,5%

Insulation level

LI 125 AC 50


12-24kV / 250 A plug-bushing DIN 50180 or ceramic-bushing DIN 50386
Low voltage Selectable

Insulation level



1kV / 250 - 5000A DIN EN 50386

LV-connecting lug

Flange connection DIN 43675 or
conductor terminal IEC 61238

Protection device

None, optional DGPT2
Thermometer pocket Thermometer pocket according to DIN 42554 on LV-side
Driving rolls Lengthwise and crosswise DIN EN 50216-4, material: steel
Coating RAL 7033, total coating thickness>= 140µm
Width x depth x height (in mm) 1,080x760x1,650 1,260x850x1,650

(uk=4%) /

Total weight (in kg) 1,910 2,380 2,950 (uk=4%)
3,150 (uk=6%)

Function of voltage regulated distribution transformer

A voltage regulated distribution transformer can be used to uncouple the voltage in the medium-voltage grid from that in the low-voltage grid such that the entire voltage range of ±10 % is available in the low-voltage grid. This then provides 11 % rather than 3 % in the low- voltage grid for an increase in voltage from the feed-in of renewable energy. This is almost four times the capacity and benefits feed-in from photovoltaic systems in particular.
As soon as a complete medium-voltage ring is equipped throughout with voltage regulated distribution transformers, from a technical standpoint there is no longer any need to limit feed-in to medium voltage to a voltage increase of 2 % because the voltage regulated transformer gives each local grid station the technical ability to again regulate the voltage to within the range required by the standard. This would allow for a huge increase in the potential for voltage from wind energy systems to be absorbed.