33kV On-load Tap
Changer TYPE–T14
OLTC Type T14 is a 3-phase, single compartment, externally mounted Miniature on-load tap changer of rating 33KV 200A with Coarse Fine/Reversing. T14 works on the principle of high speed transition resistance and is suitable for both star and delta connected transformers. T14 works on flag cycle and
is suitable for bi-directional power flow for its max current of 200A at a step voltage of 850V.
Advantages
- T14 can be used on Transformers up to 16 MVA Delta.
- The miniature design has maintenance free and very low oil requirement is an added advantage.
- T14 has a unique plug-in terminal design for easy connection to a Transformer.
- An electronic digital controller operates the motor instead of hardware-heavy conventional controls.
- This electronic digital controller has a built-in Automatic Voltage Regulating Relay (AVR).
- Remote operation is made possible, with an optional
- “Remote Operating Device"(ROD), eliminating a
- conventional, expensive RTCC. This ROD facilitates
- Remote operation is made possible, with an optional “Remote Operating Device"(ROD), eliminating an expensive RTCC. This ROD facilitates remote “Raise\Lower” operations.
Key Features
- The entire tap changer unit consists of 3-phase boards and a drive mechanism housed in a sheet metal enclosure.
- The switch chamber and the drive mechanism are separated by a metal sheet partition.
- The fixed contacts are mounted on lead embedded epoxy cast phase boards. The moving contact slides on both sides of these fixed contacts and selects the tap.
- The selector switch combines the functions of a tap selector and a diverter switch.
- The drive mechanism has an energy storage device that releases the spring energy to drive the selector switch.
Specifications
- Rated voltage: 33kV
- Max. voltage: 36kV
- Max. rated through current: 200A
- Max. rated step voltage: 850V
- No. of positions: 17 C-F
- Max. witching capacity: 85kVA
- Max. voltage over tapping range: 7200V
- Mechanical Operation: 500000
- Type tested according to: IEC 60214
- Total weight with oil: 320 kgs
