Lightning Transformer
- LIGHTING TRANSFORMER WITH DYN11.
- LIGHTING TRANSFORMER WITH Dzn0.
LIGHTING TRANSFORMER WITH DYN11
- Three phase distribution voltage is standardized at 415 / 433 volts. Generally LT Industrial load is consisting of lighting, motors, heating load etc
- For lighting load a reduction of voltage affects their performance marginally even not more than 5%.
- A voltage as low as 380 Volts reduces the lumen output by only as low as 5% & this reduction as not noticeable. However the power consumption is reduced by approx more than 15% as it is proportional to V2
As below
That is reduction of 16%
- Thus by applying the lowest voltage of 380Volts, it is possible to reduce the power consumption by 16% (Supplying power through Lighting Transformer of 415/380 Volts)
Following tangible or intangible benefits of using lighting transformer
- Electrically isolating of the lighting load from main load
- Better control on protection systems due to separation of neutral of lighting load & main load
- Due to Lower voltage the life of luminaries shall be longer
- Easy maintain ability, Dry type lighting transformers are maintenance free, no oil leakage
- Being dry type transformer can be mounted inside basement, or on the floors
LIGHTING TRANSFORMER WITH DZN0
For selecting Zig zag Connection:The Zig Zag winding reduces voltage unbalance in systems where the load is not equally distributed between phases, and permits neutral current loading with inherently low zero sequence impedance.
- Interconnection phases in zigzag winding effects a reduction of third harmonic voltages and at the same time permits unbalanced loading.
- This connection may be used with either delta connected or star connected winding either for step-up or step-down transformers and its provides a neutral for earthing purposes.
- The amount of copper required from a zigzag winding in 15% more than a corresponding star or delta winding. This is extensively us
Advantage of Zig zag transformer
The following are the advantages of zigzag
transformer compared to Scott Tee transformer
and other grounding transformers
1) Less cost compared to Scott Tee transformer
2) Provides low impedance to zero sequence
This type of transformer is used in applications where the transformer is to be installed in harsh climatic conditions (smoke, pollution, dusty environment,etc.) or if the transformer is KNAN cooling type.
Auto Transformer
An autotransformer (sometimes called auto step down transformer) is an electrical transformer with only one winding. In an autotransformer, portions of the same winding act as both the primary and secondary sides of the transformer.
Earthing Transformers
An earthing transformer (neutral coupler) is a three-phase transformer connected to the power system to provide a neutral connection for earthing, either directly or via impedance.