5–32
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
Definite Time Curve
The definite time curve shape causes a trip as soon as the pickup level is exceeded for a
specified period of time. The base definite time curve delay is 100 ms. The curve multiplier
of 0.00 to 1000.00 makes this delay adjustable from instantaneous to 100.00 seconds in
steps of 1 ms.
(EQ 0.7)
where:
T
= Trip Time in seconds
M
= Multiplier Setpoint
I
= Input Current
I
pickup
= Pickup Current Setpoint
Table 5–5: FlexCurve™ Trip Times
Pickup
I
/
I
pkp
Trip
Time
(ms)
Pickup
I
/
I
pkp
Trip
Time
(ms)
Pickup
I
/
I
pkp
Trip
Time
(ms)
Pickup
I
/
I
pkp
Trip
Time
(ms)
1.03
2.9
4.9
10.5
1.05
3.0
5.0
11.0
1.1
3.1
5.1
11.5
1.2
3.2
5.2
12.0
1.3
3.3
5.3
12.5
1.4
3.4
5.4
13.0
1.5
3.5
5.5
13.5
1.6
3.6
5.6
14.0
1.7
3.7
5.7
14.5
1.8
3.8
5.8
15.0
1.9
3.9
5.9
15.5
2.0
4.0
6.0
16.0
2.1
4.1
6.5
16.5
2.2
4.2
7.0
17.0
2.3
4.3
7.5
17.5
2.4
4.4
8.0
18.0
2.5
4.5
8.5
18.5
2.6
4.6
9.0
19.0
2.7
4.7
9.5
19.5
2.8
4.8
10.0
20.0
T
M
100 ms, when
I I
pickup
>
×
=
