38
ANSI MEDIUM VOLTAGE METAL-CLAD DIGITAL SWITCHGEAR
Test Setup for Omicron – 1 phase
For high setting of Overcurrent protection, you
may need to apply at max. 93.75 Vrms, 60 Hz
which represents 50 kA of symmetrical short
circuit current on the primary side. Low level
output of CMC tester has limitation 7.07 Vrms.
Therefore, it is recommended to use high voltage
outputs situated on the front side of the tester.
These can only be connected to the relay as a 1
phase connection.
• Step 1/3
The protection relay and tester must be
grounded on the same electrical potential.
Notice:
Figure 78: Connecting cable with RJ45
connector and banana contacts can be ordered
separately from ABB, if needed.
• Step 3/3
Simulate high currents on the current sensor
input via the front voltage outputs 1, 2.
- U1 = U2 with 180° phase shift (symmetrical
source).
Simulate voltage on the voltage sensor input via
the front voltage output U4, N.
•
U4 = Un/√3
—
77
—
78
—
79
—
77 1 phase test setup
for the Omicron tester
—
78 Connecting cable
with RJ45 connector
and banana contacts
—
79 Setting of high
voltage analog
outputs in the Test
Universe program
• Step 2/3
Omicron tester is connected via connecting
cable terminated with banana connectors and
RJ45 connector on the other one end to the FT-
14D switch or directly to the protection relay if
the FT-14D switch is not installed. Wires for the
voltage sensor are connected to the voltage
output 4 output as Phase – Ground voltage.
Wires for the current sensor are connected to
the voltage outputs 1, 2. Neutral N is connected
to the ground.
NOTICE
Circuit breaker
open, auxiliary
NO contact
Connecting sensor cable
with banana connectors
Current sensor signal
PIN 4, 5
Voltage sensor signal
PIN 7, 8
Simulated current up to 80 A
86
MO
FT-14 D
test switch
Low voltage compartment of
switchgear panel
Tripping contact
Trip command
Stop timer
