Installation and Commissioning
8-197SJ62 Manual
C53000-G1140-C121-1
8.3 Commissioning
When testing the device with directly connected test equipment, make sure that no
other measurement quantities are connected and that the trip and close circuits to the
circuit breakers and other primary switches are disconnected from the device.
8.3.1 Current, Voltage, and Phase Rotation Testing
Load Current
≥ [10% I
N
]
The connections of the current and voltage transformers are tested using primary
quantities. Secondary load current of at least 10 % of the nominal current of the device
is necessary. With proper connections of the measuring circuits, none of the mea-
sured-values supervision elements in the device should pick up. If an element detects
Warning!
When operating an electrical device, certain parts of the device inevitably have dan-
gerous voltages. Severe personal injury or property damage can result if the device is
not handled properly.
Only qualified people shall work on and around this device after becoming thoroughly
familiar with all warnings and safety notices in this instruction manual as well as with
the applicable safety steps, safety regulations, and precautionary measures.
The main points to observe are:
• The device is to be grounded to the substation ground before any other connections
are made.
• Hazardous voltages can exist in the power supply and at the connections to current
transformers, voltage transformers, and test circuits.
• Hazardous voltages can be present in the device even after the power supply volt-
age has been removed, i.e. capacitors can still be charged.
• After removing voltage from the power supply, wait a minimum of 10 seconds be-
fore re-energizing the power supply. This wait allows the initial conditions to be firm-
ly established before the device is re-energized.
• The limit values given in Technical Data (Chapter 10) must not be exceeded, neither
during testing nor during commissioning.
DANGER!
Current transformer secondary circuits must be short-circuited before the cur-
rent leads to the device are disconnected!
If test switches are installed that automatically short-circuit the current transformer cir-
cuits, opening these test switches (placing them in the "Test" position) is sufficient pro-
vided the short-circuit function has been previously tested.
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