132KV TAP CHANGER
TYPE ABS 132
CONSTRUCTION DETAILS
star connected transformers. The tap changer is
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.
equipped with a change over switch and will
MOUNTING ON TRANSFORMER :
therefore suit either reversing or coarse fine type
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.
TECHNICAL DETAILS
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,
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.
SELECTOR SWITCH
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.
DRIVE MECHANISM
TERMINAL BOARD
TECHNICAL DATA
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)
OUTLINE DIAGRAM
TYPE TESTS :
As per IEC 60214 and IS 8468 all type tests are successfully performed on this on load tap changer
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
www.onloadgears.com