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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Conversion Combined Linear Tap Changer

Conversion Combined Linear Tap Changer

Conversion C ombined L inear T ap C hanger Disclosed is an End-Turn Solid-State Switching (ETSS) transformer tap which makes use of a high-speed solid-state switching network to select either the end-turn lead or one of a number of non-isolated taps on a transformer regulating winding, and...

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Product Details

Conversion Combined Linear Tap Changer

Disclosed is an End-Turn Solid-State Switching (ETSS) transformer tap which makes use of a high-speed solid-state switching network to select either the end-turn lead or one of a number of non-isolated taps on a transformer regulating winding, and connects the selected tap to, while disconnecting the previously selected tap from, a single output conductor carrying the transformer load current. ETSS effectively changes the reference to one of the possible taps interfaced to a solid-state switching network. The same transformer regulating winding connected to ETSS can also be connected in series with a slow-speed mechanically-switched tap-changer (LTC). ETSS selects one connection point on the regulating winding while LTC operation selects the second point.

A difference voltage is produced, depending on the number of turns between the ETSS selected tap and the LTC selected tap. The sign of the difference in voltage depends on whether the ETSS selected tap is higher or lower than the LTC selected tap. The difference or tap selected voltage is in series with the transformer load current. In one embodiment, the high-speed solid-state switching network uses a "Staggered Progression of Solid-State Switches" (SPSS) to select one of a number of non-isolated taps on a transformer regulating winding and connect the selected tap in series with the load circuit. A switching network arranged according to the method SPSS reduces the necessary total switch power rating, and steady-state losses. ETSS can accomplish modulation of the tap-selected voltage about the nominal value established by the LTC

Model Explanation
 WST □ - □/□-□╳□
    W:  off-circuit
    S :  three-phase or D for single phase
    T :  linear 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
   V :  series-parallel connection

Samples Technical Data

Specifications

WST 30

WST 63

WST 125

WST 250

WST 400

WST 500

Phase number

three-phases

Connection mode

Central point(Ⅱ) Neutral Point(Ⅲ) Terminal Point(Ⅰ)

Rated through current(A)

30

63

125

250

400

500

Short-circuit capacity

Heat stableness current(KA/2s)

0.7

1.6

2.5

3.75

4

5

Dynamic stableness current(KA)

1.8

4

6.25

9.375

10

12.5

           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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