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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Star-Delta Off Load Tap Changer

Star-Delta Off Load Tap Changer Tap changers can be connected to the primary or secondary side windings of the transformer depending on: – Current rating of the transformer – Insulation levels present – Type of winding within the transformer (e.g. Star, delta or autotransformer) – Position of...

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Product Details

Star-Delta Off Load Tap Changer

Tap changers can be connected to the primary or secondary side windings of the transformer depending on:
 – Current rating of the transformer
 – Insulation levels present
 – Type of winding within the transformer (e.g. Star, delta or autotransformer)
 – Position of tap changer in the winding
 – Losses associated with different tap changer configurations e.g. Coarse tap or reverse winding
 – Step voltage and circulating currents
 – Cost
 – Physical size

Transformers are one of the more expensive pieces of equipment used in a power system, and the potential consequences of failure can be quite damaging. The largest cost transformer failures have occurred due to internal winding faults, faulty load tap changers, and failed winding accessories respectively. 

Failure of winding accessories includes loose coil clamping bolts, together with internal winding faults and faulty tap changers. These failures affected on average ten transformers per year during the period 1975 to 1995, incurring repair costs of at least $600,000 per year, together with other associated costs.

Model Explanation
 WSL□ □/□-□╳□
    W:  off-circuit
    S :  three-phase
    L :  cage type
    □:  voltage regulation model  
    □:  rated current
    □:  rated voltage
    □:  number of tapping heads
    □:  number of tapping position 

Voltage Regulation Model
    I  :  linear regulating
    II :   central point
    III :  neutral point
   IV :  Y-△ conversion
    V :   series-parallel connection
   VI:   positive and negative regulation           

Samples Technical Data

Performance parameters Rated voltage KV

Installation level(kV)

Sealing performance

Power frequency(KV/1min)

Impulse(1.2/50us)

To earth

Inter Phase

Inter Contact

To earth

Inter Phase

10

42

42

18

75

75

0.25MPa 24h

20

55

55

20

150

150

35

95

95

30

230

230

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