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IDMT curve operation are given as:
Pickup value
= 110%,
Voltage Max Cont
= 100%,
Time multiplier
= 5,
Maximum trip time
= 3600 s,
Constant delay
= 0.8 s and
Cooling time
= 100 s.
GUID-78B05F4B-3434-4DD5-89F6-17F099444C04 V1 EN
Figure 326:
Tripping curve of “OvExt IDMT Crv4” based on the specified settings. The
two dots marked on the curve are referred to in the text.
If the excitation level stays at 1.25, the tripping occurs after 15.20 s. At the excitation level
of 1.42, the time to tripping would be 5.90 s as per the two dots in
. In this case,
the setting
Maximum trip time
3600 s does not limit the maximum trip time because the
trip time at
Pickup value
= 110% (1.1 pu) is approximately 75 s.
4.5.6.7
Signals
Table 558:
24 Input signals
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
I_B
SIGNAL
0
Phase B current
I_C
SIGNAL
0
Phase C current
I
1
SIGNAL
0
Positive-phase sequence current
Table continues on next page
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
655
Technical Manual
Содержание Relion 615 series
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