OMICRON 163
Off-service diagnostic methods
17.2 Testing high-voltage circuit breakers
The high-voltage (HV) circuit breakers are typically tested with the CB MC2 and CB TN3 modules in
connection with CIBANO 500. If you want to test the HV circuit breakers without the CB MC2 modules,
see 17.1 "Testing medium-voltage circuit breakers" on page 119. In this case read both sections
carefully and use Primary Test Manager as described in 17.1 "Testing medium-voltage circuit breakers"
on page 119 but observe also the safety rules and tips and tricks relevant for testing the HV circuit
breakers.
17.2.1 Safety precautions in the substation
Always observe the following safety rules:
• Disconnect completely.
• Secure against re-connection.
• Verify that the installation is dead.
• Carry out grounding and short-circuiting.
• Provide protection against adjacent live parts.
• Ground the test object at one or more terminals during connecting, testing and disconnecting.
Separate your working area as shown in Figure 1-1: "Example of the separation of the work and high-
voltage test areas" on page 12 into a work area and a high-voltage test area when a test is running. Set
up a suitable barrier and, if applicable, status lights to protect others from accessing the high-voltage test
area and accidentally touching live parts.
If there is a longer distance between the location of CIBANO 500 and the high-voltage test area (that is,
the test object), a second person with an additional Emergency Stop button is required.
DANGER
Death or severe injury caused by a lightning discharge
► Do not connect the test set to the test object if there is a possibility of a thunderstorm over any
part of the system.
► Always observe the weather conditions while testing with CIBANO 500.
WARNING
Death or severe injury caused by high voltage or current possible
► Do not test with CIBANO 500 without grounding the circuit breaker.
► Always ground the circuit breaker on both ends on all phases and close the circuit breaker to
have proper grounding between the interrupters.
WARNING
Death or severe injury caused by high voltage or current possible
► Never use the CIBANO 500 test set without a solid connection to ground.
► Ground CIBANO 500 with a cable of at least 6 mm
2
cross-section as close as possible to the
operator.
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