ABB UniGear Digital, Commissioning And Testing Manual

Page: 82 / 98

SECO NDARY TEST S ETU PS SECO NDARY TESTING O F PROTECTIO N R ELAYS
70 1VLG5000 17 C
Test Setup for Omicron – 1 phase
For high setting of Overcurrent protection, you may need to apply at max. 93.75 Vrms, 50 Hz
which represents 50 kA of symmetrical short circuit current on the primary side. Low level
output of CMC tester has limitation. Therefore, it is recommended to use high voltage out-
puts 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.
Step 2/3
Omicron tester is connected via connecting cable terminated with banana connectors and
RJ45 connector on the other one end to the ESSAILEC
® test block or directly to the protection
relay if the ESSAILEC ® test block is not installed. Wires for the voltage sensor are connected to
the voltage output 4 output as Phase – Earth voltage. Wires for the current sensor are con-
nected to the voltage outputs 1, 2. Neutral N is connected to the ground.
Figure 108: 1 phase test setup for the Omicron tester
Figure 109: Connecting cable with RJ45 connector and banana contacts (it is available on cli-
ent request)