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Three-phase Round Off Load Tap Changer

Three-phase Round Off Load Tap Changer This terminal point round type three-phase tap changer is mainly used on oil immersed distribution transformer. A distribution transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping...

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Product Details

Three-phase Round Off Load Tap Changer
This terminal point round type three-phase tap changer is mainly used on oil immersed distribution transformer.

A distribution transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer. The invention of a practical efficient transformer made AC power distribution feasible.

Distribution transformers normally have ratings less than 200 kVA, although some national standards can allow for units up to 5000 kVA to be described as distribution transformers. Since distribution transformers are energized for 24 hours a day (even when they don't carry any load), reducing iron losses has an important role in their design. As they usually don't operate at full load, they are designed to have maximum efficiency at lower loads. To have a better efficiency, voltage regulation in these transformers should be kept to a minimum. Hence they are designed to have small leakage reactance.

Model Explanation
 WSP □ - □/□-□╳□
    W:  off-circuit
    S :  three-phase or D for single phase
    P :  round type tap chager
    □:  voltage regulation model
    □:  rated current
    □:  rated voltage
    □:  number of tapping heads
    □:  number of tapping position
Voltage Regulation Model
    I  :  terminal point
    II :   central point
    III :  neutral point
   IV :  Y-△ conversion

Samples Technical Data

Specifications

WSP 63

WSP 125

WSP 250

Phase number

three-phases

Connection mode

Central point (Ⅱ)  Neutral point (Ⅲ) 

Rated through current (A)

63

125

250

Short-circuit capacity

Heat stableness current(KA/2s)

1.6

2.5

3.75

Dynamic stableness current(KA)

4

6.25

9.375

Rated frequency

50~60

Insulation level(KV)

Rated Voltage

10KV

20KV

35KV

Power-frequency withstand Voltage(50Hz/1min)

42KV

55KV

95KV

Impulse(1.2/50μs)

75KV

125KV

250KV

Sealing Performance(KPa/24h)

60

Machine life(Thousands of times)

2

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