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Figure 2-60
2.27.2 Setting Notes
General
Inadvertent energizing protection is only effective and available if address 171
INADVERT. EN. is set to Enabled during configuration. If the function is not required
Disabled is set. Address 7101 INADVERT. EN. serves to switch the function ON or
OFF or to block only the trip command (Block relay).
Parameter 7102 I STAGE serves to specify the current pickup threshold of the inad-
Criteria
vertent energization protection function. As a rule, this threshold value is set more sen-
sitively than the threshold value of the time-overcurrent protection. In this case, the in-
advertent energizing protection may only be effective if the device is either in
operational condition 0 or if no nominal conditions have been reached yet. The param-
eter 7103 RELEASE U1< serves to define these nominal conditions. The typical
setting is about 50 % to 70 % of the nominal voltage. The parameter value is based
on phase-to-phase voltages. A 0 V setting deactivates the voltage tripping. However,
this should only be used if 7102 I STAGE shall be used as 3rd time-overcurrent pro-
tection stage, at a very high setting.
The parameter 7104 PICK UP T U1< parameter represents the time delay for the
release of the tripping condition with undervoltage. The user should select a higher
value for this time delay than for the tripping time delay of the time-overcurrent protec-
tion.
The delay time to block the tripping conditions when the voltage is above the under-
voltage threshold is set at 7105 DROP OUT T U1<. The inadvertent energizing pro-
tection is blocked only after this time in order to enable a tripping subsequent to con-
nection.
7UM61 Manual
C53000-G1176-C127-3
Logic Diagram of the Inadvertent Energizing Protection (Dead Machine Protec-
tion)
2.27 Inadvertent Energization (ANSI 50, 27)
163
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