11kV Tap Changer
Type ABS11
OLTC type ABS11 is a 3-phase, single compartment, externally mounted on-load tap changer. This OLTC works on the principle of high speed transition resistance and is suitable for application at all locations of 11kV star and delta connected transformers. The tap changer follows the principle of asymmetrical pennant cycle thus making it suitable for unidirectional flow of power.
Key Features
- Tap changer unit is housed in a sheet metal enclosure and divided into two chambers i.e. the selector switch and the drive mechanism chamber.
- The selector switch is separated from the drive mechanism by a metal sheet.
- The selector switch combines the function of the tap selector and diverter switch and has a main contact and an auxiliary contact.
- The drive mechanism is coupled to the selector switch by a drive shaft and series of gears and has an energy storage device that releases energy to drive the selector switch.
- The tap changer is mounted on the transformer by taking out leads via the epoxy cast terminal board of the tap changer, which is supplied with OLTC.
- The tap changer is protected by an oil surge protective relay (OSR) which is connected to a conservator.
Specifications
- Max. voltage: 12kV
- Max. rated through current: 200A
- Max. rated step voltage: 300V
- Rated insulation level: 28kV power frequency and 75kV impulse
- Max no. of tapping positions: 17
- Tapping arrangement: Linear
- Cycle of transition: Asymmetric pennant cycle
- Weight of OLTC with oil: 610 kgs
- Oil content: 245 litres
