IG-150-EN version 04; 03/10/16
83
General instructions
ekor.rps
Protection functions. Description and settings
4.14. Overvoltage protection
4.14.1. General description
Three-unit overvoltage protection, which can be simples
or compounds (see “General settings”), with following
selectionable characteristics to choose from (function 59):
Timed characteristic (programmable curves IEC or ANSI)
1. Inverse normal time (I BSC or I ANSI)
2. Inverse short time (IC BSC)
3. Inverse long time (IL BSC)
4. Very inverse time (MI BSC or MI ANSI)
5. Extremely inverse time (EI BSC or EI ANSI)
6. Very inverse special time (MIEs BSC)
7. Moderately inverse time (ANSI)
8. 4 User curve (USER 1 up to USER 4)
9. Definite time
Instantaneous characteristic
1. Instantaneous unit
2. Additional time
The functioning of this protection does not cause automatic
reclosing.
4.14.2. Setting ranges of the timed characteristic (6 tables)
Setting
Min
Max
Step
Notes
Enable
YES/NO
Pickup [V]
10
200
0,1
Curve type
Definite time
Normal inverse curve
Short inverse curve
Long inverse curve
Very inverse curve
Extremely inverse curve
Very inverse special curve
Moderately inverse curve
User curve
Time index
0.05
0.5
1.09
30.0
0.01
0.1
For IEC curves
For ANSI curves
Definite time [s]
0.0
600.0
0.01
Table 4.16.
Setting ranges of the timed characteristic (6 tables)
These settings can be found in the console on the screen
“voltage protection”.
The timed curves are the same as the ones used by the
overcurrent protection units.
The pickup voltage is set to secondary volts.
Working with definite time, the relay will trip at the end of
the programmed time since the pickup voltage is exceeded,
independently of the voltage value
.
Working with curve, the tripping time depends on the
selected curve (family and index) and on the voltage value.
In the Appendix II are given the graphics and formula for
calculating the time, in function of the ratio between the
voltage and the pickup voltage.
The remarks about accuracy in times are the same as the
given for the overcurrent function
.
Summary of Contents for ekor.rps
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