External Current Transformers - Siemens SENTRON 3WL10 Series Manual

Accessories
3.4 External accessories
The start page of the DSP800 displays the status and maximum current of all circuit
breakers. All the detailed information about individual molded case circuit breakers can be
selected via the structured menu. This includes:
● Measured values of the ETU
● ETU setting parameters
● Status
● Diagnostics
3.4.3

External current transformers

①
Rogowski CT solo external neutral
②
CT for direct measurement of the ground-fault current in the grounded transformer star point (G_ret), ground return
method
③
Summation current transformer for direct residual current measurement across all phases (Rc CT)
The direct measuring methods (
current (for details, see Section Parameters of the trip units (Page 54)).
90
② ③
and ) are more precise in determining the ground-fault
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01