ABB REL650 Applications Manual page 174

Section 6
Impedance protection
168
time to consider the voltage recovery time at energizing the line. A setting equal to 0.1 sec
have been proven to be suitable in most cases from field experience.
AutoInit: Automatic activating of the ZCVPSOF function is by default set to Disabled. If
automatic activation Deadline detection is required, set the parameter Autoinit to
Enabled. Otherwise the logic will be activated by an external BC input.
tSOTF: The drop delay of ZCVPSOF function is by default set to 1 second, which is
suitable for most applications.
tDLD: The time delay for activating ZCVPSOF function by the internal dead line
detection is by default set to 0.2 seconds. This is suitable in most applications. The delay
shall not be set too short to avoid unwanted activations during transients in the system.
1MRK 506 334-UUS A
Application manual