ABB RELION REX640, Руководство по эксплуатации продукта

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Table 56. Non-directional earth-fault protection (EFxPTOC)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
EFLPTOC
±1.5% of the set value or ±0.002 × I
n
EFHPTOC
and
EFIPTOC ±1.5% of the set value or ±0.002 × I
n
(at currents in the range of 0.1…10 × I
n
)
±5.0% of the set value
(at currents in the range of 10…40 × I
n
)
Start time 1)
Minimum Typical Maximum
EFIPTOC 2) :
I
Fault
= 2 × set
Start value
I
Fault
= 10 × set
Start value
8 ms
8 ms
11 ms
9 ms
14 ms
11 ms
EFHPTOC and EFLPTOC
3)
:
I
Fault
= 2 × set Start value
23 ms
26 ms
29 ms
Reset time Typically <40 ms
Reset ratio Typically 0.96
Retardation time <30 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
4)
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
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) Measured with static signal output (SSO)
3) Includes the delay of the signal output contact (SO)
4) Maximum
Start value = 2.5 × I
n
,
Start value multiples in the range of 1.5...20
Table 57. Non-directional earth-fault protection (EFxPTOC) main settings
Parameter Function Value (Range) Step
Start value EFLPTOC 0.010...5.000 × I
n
0.005
EFHPTOC 0.10...40.00 × I
n
0.01
EFIPTOC 1.00...40.00 × I
n
0.01
Time multiplier EFLPTOC and EFHPTOC 0.025...15.000 0.005
Operate delay time EFLPTOC and EFHPTOC 40...300000 ms 10
EFIPTOC 20...300000 ms 10
Operating curve type
1)
EFLPTOC Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
EFHPTOC Definite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
EFIPTOC Definite time
1) For further reference, see the Operation characteristics table
1MRS759144 A
REX640
Product version: 1
46 ABB