Characteristic Value
PHIPTOC:
I
Fault
= 2 × set
Start value
I
Fault
= 10 × set
Start value
16 ms
11 ms
19 ms
12 ms
23 ms
14 ms
PHHPTOC and PHLPTOC:
I
Fault
= 2 × set
Start value
23 ms 26 ms 29 ms
Reset time
Typically 40 ms
Reset ratio Typically 0.96
Retardation time <40 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Operate time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms
Suppression of harmonics
RMS: No suppression
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
Peak-to-Peak: No suppression
P-to-P+backup: No suppression
4.1.1.12 Technical revision history
Table 242: PHIPTOC Technical revision history
Technical revision Change
B Minimum and default values changed to 40
ms for the
Operate delay time
setting
C Minimum and default values changed to 20
ms for the
Operate delay time
setting
Minimum value changed to 1.00 x In for the
Start value
setting
D Internal improvement
E Internal improvement
Table 243: PHHPTOC Technical revision history
Technical revision Change
C
Measurement mode
"P-to-P + backup" re-
placed with "Peak-to-Peak"
D Step value changed from 0.05 to 0.01 for the
Time multiplier
setting
E Internal improvement
F Internal improvement
1
Measurement mode
= default (depends on stage), current before fault = 0.0 × I
n
, f
n
= 50 Hz, fault
current in one phase with nominal frequency injected from random phase angle, results based
on statistical distribution of 1000 measurements
2
Includes the delay of the signal output contact
3
Maximum
Start value
= 2.5 × I
n
,
Start value
multiples in range of 1.5...20
1MRS757644 H Protection functions
620 series
Technical Manual
255
To Next Page
Loading...
