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.