General; For End User - c.a.p.t. AT Serie Manual Del Instrucciones

GENERAL

OCTC "Off Circuit Tap Changers" series "AT-M-KL" are rectilinear type TAP CHANGERS, oil filled installation,
inside transformer tank, horizontally or vertically assembled.
They are composed of a fixed Bakelite bar support, insulated material, where are assembled the fixed
contacts and a sliding Bakelite bar support, insulated material, where are assembled the sliding (moving)
contacts.
They can be three-phase, single-phase, two-phase, simple, double or triple, with a unique drive.
DIRECT DRIVE:
They are supplied with a pad-lockable manual drive handle (1.12.120, 1.12.130, 1.12.212, 1.12.212BE),
to install on the cover or on upper part of transformer tank wall.
INDIRECT TRANSMISSION:
All the manual commands are equipped with mechanical/manual locking mechanism with padlock
(1.12.101, 1.12.104, 1.12.201, 1.12.202, 1.12.202-2, 1.12.202BE, 1.12.208, 1.12.209, 1.12.210,
1.12.401, 1.12.402, 1.12.408, 1.12.409, 1.12.501, 1.12.502) which are installed on the side of the
transformer's tank. Some of these commands are also equipped with one or more micro-switches to
consent the electrical locking of the bus-couplers of the transformers and for the remote control of all the
positions.
CONNECTIONS, CONTROL BOX STARTING SERVICE, OPERATIONS AND FOLLOWING INTERVENTIONS
ON ELECTRICAL COMPONENTS HAS TO BE MADE ONLY FROM QUALIFIED AND AUTHORIZED PEOPLE.
OFF CIRCUIT TAP CHANGER MUST BE OPERATED ONLY WHEN TRANSFORMER IS DE-ENERGIZED.
Rated voltages, currents and standard number of positions:
SERIES
AT
direct drive
ATSP / ATST / ATCT
M
MSP / MST / MTCT
K
KL1020 /KLST / KLCT
INTERNATIONAL STANDARD: IEC60214-1 e IEC60214-2
For all matters not specifically declared remains valid the updated international standard IEC60214-1 &
IEC60214-2.
OVERLOADS
CAPT Tap Changers do not restrict the transformer emergency loading according to IEC 60076-7.
To perform the switching operation, the operator must proceed as follows. The first one and indispensable
operation is to disconnect transformer by the electrical net opening the sectionalising switches, both HV
and LV side, so transformer becomes off-circuit.
After that is necessary to open the padlock (where applied), lift the blocking knob on the drive and turn the
drive clockwise or anticlockwise according to the position change required up to reach the new position.
Then put inside the blocking knob so that the final part comes in the correspondent hole, at the end replace
if necessary the padlock.
N. B. ALL SWITCHING MANOEUVRE MUST BE PERFORMED OFF-CIRCUIT.
4
TYPE
AT/ ATC/ ATS
24-36-52-72,5
MT/ MC/ MS
24-36-52-72,5
KL/ KLD 24-36-52-72,5
OPERATION FOR END USER
kV A
120÷600
120÷600
800-1500
24
N° positions
2÷9
2
2÷15
2
2÷15
2