CIBANO 500 PTM User Manual
124 OMICRON
17.1.4 Contact Resistance test
The Contact Resistance test measures the static resistance of the circuit breaker’s main contacts.
The Contact Resistance test can be performed only when the circuit breaker is closed. A typical MV
circuit breaker has manual operation buttons at its front plate to control the circuit breaker’s spring. If the
spring is not charged, first charge the spring as described in 17.1.9 "Motor Current test" on page 152,
and then close the circuit breaker.
Note: To increase the accuracy of the measurement results for the both-side grounded circuit breakers,
you can compensate for the resistance of the ground loop by making two measurements with the circuit
breaker closed and open. To compensate for the resistance of the ground loop, select the
Compensate ground loop resistance check box (see Table 17-3: "Settings of the Contact Resistance
test" on page 126).
Connection
To connect the test object to CIBANO 500:
1. In Primary Test Manager, open the Contact Resistance test.
Figure 17-4: Hardware configuration of the Contact Resistance test
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.
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