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
chokes |
Dependent on configuration of tap changer between 0% and 5% of total
transformer losses
|
|
High voltage |
Selectable, max. 24kV voltage class |
|
Steps
|
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 |
|
HV-bushing
|
12-24kV / 250 A plug-bushing DIN 50180 or ceramic-bushing DIN 50386 |
|
Low voltage |
Selectable |
|
Insulation level
|
LI-AC3 |
|
LV-bushing
|
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 |
1,410x850x1,750
(uk=4%) /
1,500x870x1,750
(uk=6%)
|
1,550x990x1,800 |
|
Total weight (in kg) |
1,910 |
2,380 |
2,950 (uk=4%)
3,150 (uk=6%) |
3,500 |
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.