132kv tap changer type abs 132 - on load gears · 132kv tap changer type abs 132 ... auxiliary...
TRANSCRIPT
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 : [email protected]