ABB REX640 User Manual

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

ABB REX640 Specifications

General

Device Type	Protection Relay
Communication Protocols	IEC 61850, Modbus, DNP3, IEC 60870-5-103
Rated Frequency	50/60 Hz
Operating Temperature Range	-25°C to +55°C
Display	LCD
Housing	Metal
Manufacturer	ABB
Model	REX640
Mounting	Rack mounting
Inputs and Outputs	Configurable binary inputs and outputs
Rated Voltage	48-240 V AC/DC
Protection Functions	Overcurrent, Earth Fault
Input Voltage	48-240 V AC/DC
Certifications	CE, UL, IEC