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Central Three-phase Round Tap Changer

Central Three-phase Round Tap Changer Central point three-phase round off load tap changers are also employed in high voltage transformers in which the system includes a no load tap changer on the primary winding to accommodate system variations within a narrow band around the nominal rating. In...

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Central Three-phase Round Tap Changer
Central point three-phase round off load tap changers are also employed in high voltage transformers in which the system includes a no load tap changer on the primary winding to accommodate system variations within a narrow band around the nominal rating. In such systems, the tap changer will often be set just once, at the time of installation, although it may be changed later during a scheduled outage to accommodate a long-term change in the system voltage profile.

Tap changers exist in two primary types, no load tap changers (NLTC) which must be de-energized before the turn ratio is adjusted and on load tap changers (OLTC) which may adjust their turn ratio during operation. The tap selection on any tap changer may be made via an automatic system, as is often the case for OLTC, or a manual tap changer, which is more common for NLTC. Additionally, tap changers are often placed on the high voltage (low current) transformer winding for easy access and to minimize the current load during operation.

It is the improved product of the off-circuit tap changer in China, at present, which applies to the three-phase oil-immersed electrical power transformer with the frequency of 50HZ or 60HZ, rated voltage of 10KV or 35KV, the rated current of 63A or others. It can be directly fixed on the tank cover of the transformer which is operating under the off-circuit condition.

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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