4
Installation and Testing
4.1
General
When not shipped as part of switchgear, relay panel, circuit
breaker or control, the relay is shipped in a sturdy carton to
prevent damage during transit. Immediately upon receipt of a
relay, check the style number against the requisition and packing
list to see that they agree. Visually inspect the relay for damage
that may have occurred during shipment. If there is evident
damage, immediately file a claim with the carrier and notify the
Siemens Sales Office, or contact Electrical Apparatus Division,
Customer Service. In the event the relay is not to be installed
immediately, store the relay in its original shipping carton in a
moisture and dust free environment. When the relay is to be
placed in service, it is recommended that the verification tests
(given later in this section) be performed prior to installation.
4.2
Relay Operating Precautions
Before installation or operation of the relay, note the following
precautions.
1 . A minimum of 0.2 A in the output circuit is required to ensure
operation of the FUNCTION targets.
2. Always reset targets by means of the target reset switch.
3. The relay is a solid state device and has been tested in
accordance with the requirements defined below under
DIELECTRIC TEST. If a wiring insulation test is required on
the panel assembly where this relay is to be installed, it is
suggested that the connecting plugs (or "paddles") of the
relay be removed and the cradle withdrawn from the case
so as not to produce false readings during the wiring
insulation test.
4. When the connecting plugs are removed, the relay is
disconnected from the operating circuit and will not provide
system protection. Always be sure that external operating
(monitored) conditions are stable before removing a relay for
inspection, test, or service. Be sure that connecting plugs
are in place before replacing the front cover.
5. Be sure that the relay case is hard wired to earth ground
using no smaller than 1 2 AWG copper wire to the ground
terminal on the rear of the unit. It is desirable to use a
separate ground wire to the ground bus for each relay. If this
is not practical, the number of relays sharing a ground wire
should be kept to a minimum.
Page 1 7
4.3
Dielectric Test
In accordance with ANSI/IEEE C37.90-1 989 and IEC 255-5,
one-minute dielectric (high potential) tests may be performed up
to 1 500 Vac (45-65 Hz). This applies to all terminals, including the
ports. Note that this device employs decoupling capacitors to
ground from terminals 3, 4, 9, A, and B. Accordingly, a leakage
current of 1 00 rnA (max.) is to be expected at these terminals.
4.4
Mounting
The SCOR relay is supplied in a standard S1 size drawout case.
Figure
4
provides the outline dimensions forth is case. The panel
drilling and cutout dimensions for this case are provided in
Figure
5.
The relay does not have to be mounted vertically. Any convenient
mounting angle may be chosen.
4.5
Connections
The connections for the relay are shown in
Figure 6
and
Figure
7 .
Incorrect wiring may result in damage to the relay. Be sure to
check the model and style number of the relay with the Style
Number Identification Chart
(Figure 2)
before connecting and
energizing the relay.
The terminals along the top and bottom of the back of the case
are suitable for use with wiring terminals and wire sizes of 1 4 AWG
or larger. The RS-485 port terminals A, B, and C (back of case,
center) require a shielded, twisted pair.
Be sure the relay case is hard-wired to earth ground with no
smaller than 12 AWG copper wire. A ground terminal on the rear
of the case is provided for this purpose. Ideally, each relay should
have a separate ground wire to the ground bus. If this is not
practical, the number of relays sharing a ground wire should be
kept to a minimum.
The connections to the current transmormers are shown in
Figures 8
through
1 2.
Diagrams are presented for single-phase,
two-phase, and three-phase operation.
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