IG-150-EN version 04; 03/10/16
85
General instructions
ekor.rps
Protection functions. Description and settings
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 trips once expired the
programmed time since descending below the pickup
voltage, 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 of time, in function of the ratio between the
starting voltage and the voltage.
The remarks about times are the same as the ones quoted
for the overcurrent function.
4.15.3. Setting ranges of the instantaneous characteristic (6 tables)
Setting
Min
Max
Step
Notes
Enable
YES/NO
Phase instantaneous trip [V]
10
200
0.1
Additional time [s]
0.00
60.00
0.01
Table 4.19.
Setting ranges of the instantaneous characteristic
These settings can be found in the console on the screen
“voltage protection”.
The tripping voltage is set to secondary volts.
The remarks about times are the same as the ones quoted
for the overcurrent function.
In both the timed and instantaneous
functions, once the protection starts up, the
drop takes place when the voltage drops to
101 % of the start set value, if it is higher than
50 V (or to 102 % if it is lower).
4.16. Voltage unbalance protection
4.16.1. Timed characteristic
It is a definite time protection unit. The pickup value set
is, in per unit the ratio between the negative and positive
sequence voltage modulus.
The relay trips once expired the programmed time since the
pickup value is exceeded.
Settings ranges (6 tables)
Setting
Min
Max
Step
Notes
Enable
YES/NO
Pickup
0.10
0.50
0.01
In per unit. V
2
/V
1
Definite time [s]
0.0
600.0
0.01
Table 4.20.
Settings ranges
These settings can be found in the console on the screen
“overcurrent protection (2)”.
Summary of Contents for ekor.rps
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