COMMISSIONING AND TESTING GUIDE 37
Secondary test setups
There are different secondary testers with a wide
range of additional functionality available on the
market. The testers are primarily operated over a
PC with corresponding software which brings
additional functionality to the end user. The
secondary tester providing support to low level
outputs (linear, Rogowski) is connected via a
testing cable or via adapter to the sensor input of
the protection relay. This section describes how
to use testers from Omicron and Megger.
Moreover, it is indicated how these testers can be
used for 3 phase testing and 1 phase testing of
protection relays.
The maximum low-level output from the CMC
tester is 7.07 Vrms. Two dynamic amplitude range
modes (normal = default and high) can be
selected for Rogowski coil simulation. In Normal,
the dynamic range amplitude is limited to 5.9 x
180 mV when harmonics up to 400 Hz are
considered (5.9 x 400 / 60 x 0.18 = 7.08). The high
mode permits amplitudes of up to 37 x 180 mV
and is permitted via Windows registry settings
(details can be found in Omi-cron technical
documentation).
An alternative solution for pure 50 or 60 Hz sine
wave simulation is to define a linear current
sensor instead of the Rogowski current sensor.
Low level output signals up to 7.07 Vrms are then
available.
• 80 A / 0.180 V
maximum simulated current is 3 770 A,
50 / 60 Hz
Test setup for Omicron – 3 phases
Low-level outputs of the CMC tester (for example
CMC 850; CMC 356; CMC 256plus; CMC 353) are
connected to an interface adapter CMLIB REF6xx
used to connect ABB’s Relion® 615/620 series
fitted with combined sensor inputs. The testing
adapter is usually connected to the protection
relay through FT-14D switch via connecting
shielded cables terminated with RJ45 connectors.
If the FT-14D switch is not installed then the
testing adapter is connected directly to the
protection relay via connecting shielded cables
terminated with RJ45 connectors.
—
75
—
76
—
75 3 phases test setup
for the Omicron tester
—
76 Linear current
sensor instead of the
Rogowski setting in
the Omicron tester
Tripping contact
FT-14 D
test switch
Testing adapter
CMLIB REF 6xx
Analog signal:
3 x I (180 mV for 60 Hz system
Circuit breaker
open, auxiliary
NO contact
Adapter cable
Stop timer
Trip command
Tester
86MO
Low voltage compartment of
switchgear panel
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