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The start page of the DSP800 displays the status and maximum current of all devices. All the
detailed information about individual devices can be selected via the efficiently structured
menu. This includes:
• Measured values such as current, voltage and energy values
• Adjustable parameters of the electronic trip unit
• Status of the circuit breaker
• Diagnostics
Information is visualized using ready-made menus and does not require software
development. Templates for 1, 2, 4 and 8 devices are available as default screens. These can
either be selected and arranged automatically or they can be manually assigned. In addition,
the metering values to be displayed can be selected in the overview.
3.5.3
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 66)).
3.5.3.1
Rogowski CT solo external neutral
The optional external current transformer for N conductor is only for three-pole circuit breakers.
It enables protection of the neutral conductor from overload and short-circuit by the ETU of the
circuit breaker. The transformer is connected directly to the auxiliary conductor terminal system.
It is suitable for all electronic trip units of the 3- and 6-series.
The external current transformer for N conductor is also used for determining ground-fault
currents by calculation of the vector sum of the currents for trip units with a G protection
function (ETU360 and ETU660).
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
②
③
and
) are more precise in determining the ground-fault
Accessories
3.5 External accessories
113
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