Ct Ratio - ABB M4M 20 User Manual

32 M4M 20 NETWORK ANALYZER USER MANUAL

7.5.CT ratio

M4M is capable to measure current only via indirect connection by means of current transformers CTs
.../5A or .../1A (M4M 20, M4M 20 Modbus, M4M 20 Ethernet, M4M 20 I/O, M4M 20 Profibus, M4M 20
Bacnet, M4M 20-M Modbus, M4M 20-M Ethernet) , or Rogowski coils (M4M 20 Rogowski)..
If CTs are used, then on the network analyzer it is needed to set the transformation ratio of the installed
current transformers.
If Rogowski coils are used (M4M 20 Rogowski), it is not needed to set any transformation ratio.
In order to configure the current transformers ratio it is possible either to choose the values from a list of
values (default settings) or to manually enter a value.
Settings - choose CT ratio
Manual
40/5 A
50/5 A
60/5 A
2
Default values of CT ratio
40/5
50/5
60/5
80/5
100/5
150/5
→ → →
Installation
CT ratio
CT ratio
1. Use
fields.
2. Press
modification.
1
Default values of CT ratio
200/5
250/5
400/5
600/5
800/5
1000/5
to scroll the list on of values or
to confirm or to cancel the
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