Copyright © ATL Transformers Ltd 2022
Doc Ref TECH149 Issue 3
9
Primary & Secondary terminals are accessible within the enclosure by removal of the
transformer lid. Cables glands are provided either side of the enclosure for cable access and are
removeable for customization of gland and cable entry requirements.
●
On class I models an earth terminal is provided and shall always be connected to the
protective earth network.
●
Cable glands shall always be removed where hole profiles for conduit are being made. Never
drill holes on transformer panels in situ as swarf can enter the enclosure and short circuit the
magnetics when energized.
●
Cables should be installed correctly and not resting on top of the transformer core. Adequate
bend radius’s should be observed on the installed cables and all terminals checked for good
compression prior to energization.
●
All cabling should meet the requirements of NR standards: NR/L2/SIGELP/27410 Issue 2 and
NR/L2/SIGELP/27421 & 27422
INPUT
: Monitor the supply voltage with a calibrated DVM to check your distribution is within
tol4%/-6%. Connect Supply cables to the provided Input Voltage terminals ensuring they
are routed through suitable conduit and secure before energizing the transformer.
OUTPUT
: The output tap selector facilitates feeder Voltage adjustment, this can be used to reset,
reduce or boost output voltages according to your feeder requirements. Connect Output cables
to the provided terminals ensuring they are routed through suitable conduit and secure. Select
the required output voltage using the on-board tap selector and reinstate the transformer lid
before energizing the transformer.
3.2 CABLE CONNECTION
3.3 VOLTAGE SELECTION
0
(0) OFF
(6) +5%
(T682)
(5) +2.5%
(T666)
(7) +7.5%
(T699)
(2) -5%
(T617)
(3) -2.5%
(T634)
(1) -7.5%
(T601)
(4) NOM(V)
On-Load Tap Selector
The Voltage Selector can be found on the front of the
enclosure at the top left, the tap selector automatically
turns on a 45° and can be turned a full 360° clockwise
or anti-clockwise with 8 different settings. The standard
output for 3ph PSP/ASP range is 650V.
1.
NOTE:
- The on-load tap selector should not be used for isolation and that the
transformer should be isolated from the supply before removing covers.
