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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Star-Delta on Load Tap Changer

Star-Delta on Load Tap Changer

Star-Delta O n L oad T ap C hanger In this type of transformer connection, then primary is connected in star fashion while the secondary is connected in delta fashion. The primary side is star connected. Hence fewer numbers of turns are required. This makes the connection economical for large...

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Product Details

Star-Delta On Load Tap Changer
In this type of transformer connection, then primary is connected in star fashion while the secondary is connected in delta fashion. The primary side is star connected. Hence fewer numbers of turns are required. This makes the connection economical for large high voltage step down power transformers. The neutral available on the primary can be earthed to avoid distortion. The neutral point allows both types of loads (single phase or three phases) to be met. Large unbalanced loads can be handled satisfactory. The Y-D connection has no problem with third harmonic components due to circulating currents in D. It is also more stable to unbalanced loads since the D partially redistributes any imbalance that occurs. The delta connected winding carries third harmonic current due to which potential of neutral point is stabilized. Some saving in cost of insulation is achieved if HV side is star connected. But in practice the HV side is normally connected in delta so that the three phase loads like motors and single phase loads like lighting loads can be supplied by LV side using three phase four wire system.

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Model Explanation
 SYTXY - □( )/□-□(YC)
    S :  three-phase
    Y :  on load
    T :  capacity regulating
    X :  star-delta switching
    Y :  voltage regulating
    □:  Max. capacity
    ( ):  Min. capacity
    □:  voltage of high-voltage site
    □:  voltage regulation positions
    (YC): permanent magnet controlling devices

Main Technical Data

Application Scope

Under 630KVA and 10KV oil-immersed capacity & voltage regulating transformer

Connection Model

 

High-voltage Site

Low-voltage Site

High-capacity

Delta connection

Star connection

Low-capacity

Parallel connection

Series connection

Three-phase Max. Rated Current  

315KVA

30A

300A

630KVA

60A

550A

Max.Rated Voltage

5773V

Max.Voltage of Device Um

10KV

Tap Positions

7 or others

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