CIBANO 500 PTM User Manual
246 OMICRON
17.4 Demagnetization
On circuit breakers like gas insulated switchgears (GIS), dead tank circuit breakers and hybrid circuit
breakers, current transformers are typically integrated in the main contact path. After each performed
test on the circuit breaker or due to DC components during a short circuit the current transformers might
be magnetized. This magnetism can be caused by DC currents flowing through the primary side of the
current transformer. The Demagnetization feature is designed to demagnetize the current transformers
from the primary side. Consequently, you do not need to disconnect the current transformers from the
secondary side.
The Demagnetization function as featured by CIBANO 500, needs to apply at least 30 A through the
primary side of the current transformer. If this cannot be assured, use the OMICRON CTAnalyzer instead
and demagnetize the current transformers from their secondary side.
Note: To check the maximum continuous output current of your CIBANO 500 test system, contact
OMICRON technical support (see "Support" on page 333).
Connection
To connect the test object to CIBANO 500:
1. In Primary Test Manager, open the Demagnetization.
Figure 17-49: Hardware configuration of the Demagnetization
WARNING
Death or severe injury caused by high voltage or current possible
► Do not use external power sources for the circuit breaker’s main contacts.
► During the test, supply the circuit breaker’s main contacts only with CIBANO 500.
To Next Page
Loading...
