1. OVERVIEW
Rotary Off-Ioad Tap changer is the most classic and widely used mechanical structure form among resistive on-load tap changers. The function for the tap-changer is that we can operate the tap-changer on the transformer cover,by regulating the tap position to realize the voltage regulating of transformer as required.But only after the transformer is cut off from the electrical network,when the transformer is under off-curcuit state,could we operate this type of tap-changer.
2. Technical parameters
| Specifications | WDP63 | WDP125 | |
| Phase number | Single-phases | ||
| Connection mode | Central point | ||
| Rated through current(A) | 63 | 125 | |
| Short-circuit capacity |
Heat stableness current(KA/2S) |
1.6 | 2.5 |
| Dynamic stableness current(KA) |
4 | 6.25 | |
| Rated frequency(HZ) | 50~60 | ||
| Insulation level(KV) |
Rated voltage(KV) | 10KV | 35KV |
| Power-frequency withstand Voltage(50HZ/1min) |
42KV | 95KV | |
| Impulse(1.2/50μS) | 75KV | 250KV | |
| Sealing Performance(KPa/24h) | 60 | ||
| Machine life(Thousands of times) | 2 | ||
2. Use Condition
| Insulation medium | Temperature ℃ | |
| lowest temperature | highest temperature | |
| Air | -25 | 40 |
| Oil | -25 | 100 |
3.Features
Mature technology and high reliability:
Strong current-carrying capacity and long service life:
Relatively intuitive maintenance:
Suitable for high voltage and large current:
4.Applications
Rotary Off-Ioad Tap changers are standard equipment for high-voltage, extra-high-voltage and large-capacity power transformers and are widely used in:
Power grid transmission and transformation: main transformers in 500kV, 220kV, 110kV and other substations.
Industrial fields: arc furnace transformers, rectifier transformers and other occasions that require frequent and precise voltage regulation.
Power plants: generator step-up transformers.
Notice
1) Installation places should not be explosive and corrosive gases.
2) Before assembling the tapping switch, must check up whether the tapping switch conforms to the type specification of the transformer in order to avoid causing the loss that should not occur.
3) The leading wire of the terminal of the tapping switch mustn’t make the tapping switch deformed because of stressing and the leading wire and the moving part should have enough moving space (usually 10mm) in order to avoid movement hindered.
4) The maximum drying temperature of this switch is 110℃, if after drying,If the contact resistance is too large, should be running tap back several times.
5) When the switch is in the maximum gear position, strictly forbid wrenching the handle to the limit direction.
6) Before assembling and switching should make 3~5 times of transfer on the tapping position of the tapping switch, when the tapping has completed the regulating transfer, the transfer handle must be put into the flange locating slot.
Address：No.27, Binhai South 3 road, Yueqing Economic Development Zone, Wenzhou City,Zhejiang Province,China.
