IG-267-EN versión 01; 07/04/2017
34
Protection functions
General Instructions
ekor
.rpa
4.6.1. Timed overvoltage units
The phase and neutral timed units start up if the
fundamental value of the magnitude (single or compound
voltage, which can be set by the user) for each unit is below
the value 1.05 times the adjusted start-up, and are reset
when this value exceeds 0.95 times the adjusted value.
Tripping takes place if the unit is started up for the time
set. This time may be adjusted by selecting different types
of curve, in accordance with IEC and ANSI Standards. The
curves implemented for the voltage units are identical to
those in the overcurrent units.
The settings for the timed units are:
•
Enabling the unit
: Enable/disable the unit (ON/OFF).
•
Working voltage
: Selection of the magnitude for
working: Single or compound voltage (
Phase to neutral
or
Phase to phase
).
•
Starting up the unit
: Unit starting voltage (from 0.5 kV
to 72.0 kV).
•
Time curve
: Curve type (IEC DT, IEC NI, IEC VI, IEC EI, IEC
LTI, IEC STI, ANSI LI, ANSI NI, ANSI VI, ANSI EI).
•
Inverse curve time index
: Time index, also known as
time dial (from 0.05 to 1.60). This setting applies to all
curve types except for IEC DT.
•
Fixed time
: Unit tripping time (from 0.00 s to 100.00 s).
This setting only applies to IEC DT type curves.
4.6.2. Instantaneous overvoltage units
The phase and neutral timed units start up if the
fundamental value of the magnitude for each unit exceeds
the value 1.00 times the adjusted start-up, and are reset
when this value is below 0.95 times the adjusted value.
Tripping takes place if the unit is started up for the time set.
The settings for the instantaneous units are:
•
Enabling the unit
: Enable/disable the unit (ON/OFF).
•
Working voltage
: Selection of the magnitude for
working: Single or compound voltage (
Phase to Phase
or
Phase to Neutral
).
•
Starting up the unit
: Unit starting voltage (from 0.5 kV
to 72.0 kV).
•
Fixed time
: Unit tripping time (from 0.00 s to 100.00 s).
Summary of Contents for ekor.rpa Series
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