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4. Panel design and equipment
Cable connection compartment
The cable compartment contains current
transformers, fixed and withdrawable voltage
transformers and earthing switch according to
individual operating requirements in each case.
The cable compartment is constructed for
installation of three current transformers. Should
all three current transformers not be required,
dummy instrument transformers (or jumper with
post-insulator or KEVCD) will be installed in their
place. The fixed voltage transformers are
connected on the primary side with flexible, fully-
insulated cables which are connected to the
transformers.
The removable voltage transformers are fitted
with HRC fuses. The earthing switch can be used
with either a manual or motor-operated
mechanism. Its switching position will be
indicated both mechanically by indication on the
shaft and electrically by means of the auxiliary
switch. Three fixed surge arresters can be
mounted instead of one position of single-core
cables.
Up to two sets of Temperature Rise (TR) sensors
may be mounted in the cable compartment.
Environmental sensor may be installed in cable
compartment.
Cable connection of UniGear ZS1 12 / 17.5 kV
panels:
In the 650 mm wide panel, up to three parallel
plastic cables can be connected with single-core
cable protection and push on sealing ends with a
maximum cross-section of 630 mm2. In the 800
or 1 000 mm wide panel, up to six parallel plastic
cables can be connected with single-core cable
protection and push-on sealing ends with a
maximum cross-section of 630 mm
2
.
Customer requests regarding connections to
bars, three-core cables, special cables or sealing
ends of different types must be considered
during the order-planning stage.
Cable connection of UniGear ZS1 24 kV panels:
In the 800 mm wide panel, up to three parallel
plastic cables can be connected with single-core
cable protection and push on sealing ends with a
maximum cross-section of 500 mm
2
. In the 1 000
mm wide panel, up to six parallel plastic cables
can be connected with single-core cable
protection and pushon sealing ends with a
maximum cross-section of 500 mm
2
.
Low voltage compartment
The height of the low voltage compartment is 705
/ 1100 mm. If the secondary devices are not
intended for door installation, they are mounted
on DIN RAILS that enable any subsequent
changes to the wiring. In the lower part of the low
voltage compartment, there are two rows of DIN
RAILS placed on the metal spacers and, below
these, there is an easily accessible auxiliary
switch for the control wiring plug. Secondary
wiring inside the panel is on the right side of the
panel. The left side of the panel is for the external
wiring. On the ceiling top of the low voltage
compartment there is integrated cable channel
which is used for interconnection wiring between
panels.
Note:
According to IEC 62271-200 and IEC 50110 to
ensure personnel protection during maintenance
work, all of high-voltage conductive parts to
which access is required or provided shall be
capable of being earthed prior to becoming
accessible. This does not apply to removable
parts which become accessible after separated
from the switchgear and controlgear.
Each switchgear panel must have its own
earthing switch or earthing truck. This
requirement also applies to busbars, where
earthing can be done either by an earthing switch
mounted in top-housing box or by using an
earthing truck. Where non of these is available,
the switchgear panel shall have connection points
for applying earthing kit.
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