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GUID-DFB5F406-3F80-43B6-BD7E-93E94EFC680B V1 EN
Figure 277:
Functional module diagram
Voltage detector
This module supervises voltage presence status value of a load switch or a circuit
breaker. The
Voltage selection
setting is used for selecting the phase-to-earth or
phase-to-phase voltages for voltage detection, and the
Phase supervision
setting
defines which phase or phases are monitored. The measured voltages are compared
with threshold settings.
If the measured voltage is larger than the limit value set by
V live value
setting and high
voltage lasts longer than the time set by
V live time
setting, the voltage presence is
interpreted as live. The corresponding phase specific output indicating live situation
is activated. Phase status is also reported to the phase selection logic module.
Once the voltage is lower than setting
V live value
, corresponding phase specific
output is deactivated and voltage live timer is reset.
If the measured voltage is lower than setting
V dead value
and low voltage situation
lasts longer than the time set by
V dead time
setting, the voltage presence is interpreted
as dead. The corresponding phase specific output indicating dead situation is
activated. Phase status is also reported to the phase selection logic module.
Once the voltage is larger than setting
V dead value
, the corresponding phase specific
output is deactivated and voltage dead timer is reset.
The
Relative hysteresis
setting can be used for preventing unnecessary oscillations if
the input signal varies slightly above or below the threshold setting. After leaving the
hysteresis area, the start condition has to be fulfilled again and it is not sufficient for
the signal to only return back to the hysteresis area.
The activation of the
BLOCK
input deactivates all outputs and resets internal timers.
Phase selection logic
General output
U_LIVE
is activated when setting
Num of phases
matches the number
of phases where voltage is set above high level setting.
U_LIVE
output is deactivated
immediately after voltage live condition is no longer met.
1MRS758755 A
Section 6
Supervision functions
REC615 and RER615
531
Technical Manual
Содержание RELION Series
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