14/1/98 Page 26 Issue H
Relay Settings Test Current Nominal Operating Time
THERMAL
t6x = 10
I
FLC
= 0.5 x In
1.0 x In
3.0 x In
100.0 secs
10.0 secs
LOW SET
tI> =1.0
I> = 400% of FLC
4 x In
6 x In
1 sec--**
1 sec-**
HIGH SET
tI> = 0.5
I>> = 700% of In
8** x In
10** x In
0.5 secs
0.5 secs
EARTH FAULT
tIe = 1 sec
Ie =20% of In
0.3 x In
1.0 x In
1 sec
1 sec
Note -**
During starting the low set overcurrent is inhibited and the high set overcurrent is doubled.
If test current is applied to the relay from zero a start condition will be assumed, therefore the
test current must be applied from a running condition i.e. FLC and the trip time measured
from the instant the setting is exceeded.
Recommended Test Equipment - Available through P&B
Single Phase Secondary Injection - Sverker 750
Three Phase Secondary Injection - Freja RTS21
Primary Injection Test - up to 600A = 600 AT
- up to 2250A= ODEN/1x
- above 2250A = ODEN / 2x
Rapid Relay Test
A rapid relay test can be carried out with the relay in normal protective service. The relay test
consists of a check of incoming current values by entering Display Mode 1 and cycling through the
displayed values. This rapid test verifies that the energising and measuring circuits are operating
correctly.
Reset of Thermal capacity ( for test )
During testing, the thermal capacity may be reset to zero by removing the auxiliary supply, and then
re-energising the auxiliary supply whilst both the value up “ ∧ “ and value down “ ∨ “ buttons are
pressed.
Output Relay Test
By entering the test trip mode as detailed previously in this manual, the output relays may be
operated in a cyclic manor, testing the complete trip circuit.
Phase Rotation Test
This can only be tested with a 3 phase current injection test set with the phases 120° apart. (Single
phase injection will give spurious results.) The feature is only active during a start, therefore a
current higher than 150% FLC should be injected for a period greater than 10 sequence errors in a
row.
To Next Page
Loading...
General