Contact: Steven
Tel:+86-415-6256999
E-mail:i-trade1@lnjldq.com
Contact: Lily
Tel:+86-415-6256999
E-mail:i-trade2@lnjldq.com
Contact: Amy
Tel:+86-415-6256999
E-mail:i-trade3@lnjldq.com
Add:Tongxing industry park, Tongxing town, Zhenan, Dandong, Liaoning
Postcode:118001
Fax:86-415-6131000
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...
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 |