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 |
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| High voltage | Selectable, max. 24kV voltage class | ||||
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Steps |
5, 7 or 9 on-load steps |
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Step voltage |
Selectable, max. 600V, common 1,5%, 2% or 2,5% | ||||
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Insulation level |
LI 125 AC 50 | ||||
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HV-bushing |
12-24kV / 250 A plug-bushing DIN 50180 or ceramic-bushing DIN 50386 | ||||
| Low voltage | Selectable | ||||
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Insulation level |
LI-AC3 | ||||
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LV-bushing |
1kV / 250 - 5000A DIN EN 50386 | ||||
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LV-connecting lug |
Flange connection DIN 43675 or conductor terminal IEC 61238 |
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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 |
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.
