Table 31. Three-phase non-directional overcurrent protection (PHxPTOC) main settings
Parameter Function Value (Range) Step
Start Value PHLPTOC 0.05...5.00 pu 0.01
PHHPTOC 0.10...40.00 pu 0.01
PHIPTOC 0.10...40.00 pu 0.01
Time multiplier PHLPTOC 0.05...15.00 0.01
PHHPTOC 0.05...15.00 0.01
Operate delay time PHLPTOC 0.04…200.00 s 0.01
PHHPTOC 0.02…200.00 s 0.01
PHIPTOC 0.02…200.00 s 0.01
Operating curve type
1)
PHLPTOC Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
PHHPTOC Definite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
PHIPTOC Definite time
1) For further reference, see the Operation characteristics table
Table 32. Voltage dependent overcurrent protection (PHPVOC)
Characteristic
Value
Operation accuracy At the frequency f = f
n
Current: ±1.5% of the set value or ±0.002 × I
n
Voltage: ±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Typically 20 ms (±10 ms)
Reset time <45 ms
Reset ratio Typically 0.96
Operate time accuracy in definite time mode ±1.0% of the set value of ±20 ms
Operate time accuracy in inverse time mode ±5.0% of the set value of ±20 ms
Suppression of harmonics -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Measurement mode = default, 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.
Generator Protection and Control
1MRS757583 C
Product version: 1.3
ABB 27
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