SELECTOR SWITCH DRIVE MECHANISM TERMINAL BOARD

132KV TAP CHANGER

TYPE ABS 132

ABS132 OLTC is a single compartment externally

mounted on load tap changer. This OLTC works on

the principle of high speed transition resistance

and is applied at the neutral end of three phase,

star connected transformers. The tap changer is

equipped with a change over switch and will

therefore suit either reversing or coarse fine type

tapping equipment. The OLTC follows the

principle of flag cycle thus making it suitable for

bi directional flow of power. It has a maximum

current and voltage ratings of 300A and 132kV

respectively and it may be used on transformers

up to 70MVA. There is provision for a maximum of

17 positions when connected with a change over

switch. The compact design, with low oil

requirement adds advantage to this tap changer.

The complete tap changer unit with the drive mechanism

and the selector switch chamber are housed in a sheet

metal enclosure, with a flange for mounting on the port

on the transformer tank. The selector switch chamber

and the drive mechanism are separated by a metal

sheet. The fixed contacts are mounted on the phase

boards. The selector switch, one for each phase, moves

over these fixed contacts and selects the tap. The

selector switch comprises a main contact and two

auxiliary contacts and combines the functions of tap

selector and a diverter switch. The drive mechanism is

coupled to the selector switch by drive shafts and series

of gears. It comprises a motor reduction gear, dial switch

for tap position indication, limit switches for stopping the

motor at end positions, operation counters, and hand

drive for emergency operations. It also has an energy

storage spring whose sudden release of energy operates

the selector switch.

MOUNTING ON TRANSFORMER :

The tap changer is mounted on the transformer by

taking out leads via the epoxy cast terminal board of the

tap-changer, which is a part of OLG supply.

PROTECTIVE DEVICE :

The tap-changer is protected by an oil surge protective

relay (OSR) which is connected to a conservator. Though

an OSR is supplied with the tap changer, the conservator

and transformer oil are not part of our supply. A pressure

relief device can be provided in addition as per customer

requirements.

TECHNICAL DETAILS

CONSTRUCTION DETAILS

www.onloadgears.com

TECHNICAL DATA

OUTLINE DIAGRAM

TYPE TESTS :As per IEC 60214 and IS 8468 all type tests are successfully performed on this on load tap changer

Rated voltage 132kV (Graded neutral)

Max.Rated through current 300A

Max Rated step voltage 1200V

Rated insulation level 140kV power freq and 350kVp impulse

Max.number of tapping positions 17 with change over switch

Tapping arrangement change over (reversing/coarse-fine)

Cycle of transition Bi-directional flag cycle

Weight of tap changer with oil 1810kg

Oil content 1400 lts (approx)

ON LOAD GEARS(REF NO: OLTC 05:2010)

432, 433, SIDCO Estate, Ambattur, Chennai-600 098

Tel: +91-44-4393 5800, 4393 5811.Fax +91-44-4393 5888

E-mail : oltc-marketing@onloadgears.com