ABB REX640 User Manual

Table 70. Harmonics-based earth-fault protection (HAEFPTOC)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±5% of the set value or ±0.004 × I
n
Start time
1)2)
Typically 77 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Operate time accuracy in IDMT mode
3)
±5.0% of the set value or ±20 ms
Suppression of harmonics -50 dB at f = f
n
-3 dB at f = 13 × f
n
1) Fundamental frequency current = 1.0 × I
n
, harmonics current before fault = 0.0 × I
n
, harmonics fault current 2.0 × Start value , 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 2...20
Table 71. Harmonics-based earth-fault protection (HAEFPTOC) main settings
Parameter
Function Value (Range) Step
Start value HAEFPTOC 0.05...5.00 × I
n
0.01
Time multiplier HAEFPTOC 0.025...15.000 0.005
Operate delay time HAEFPTOC 100...300000 ms 10
Operating curve type
1)
HAEFPTOC Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
Minimum operate time HAEFPTOC 100...200000 ms 10
1) For further reference, see the Operation characteristics table
Table 72. Negative-sequence overcurrent protection (NSPTOC)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±1.5% of the set value or ±0.002 × I
n
Start time
1)2)
Minimum Typical Maximum
I
Fault
= 2 × set Start value
I
Fault
= 10 × set Start value
23 ms
15 ms
26 ms
18 ms
28 ms
20 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Retardation time <35 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
3)
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Negative sequence current before fault = 0.0, f
n
= 50 Hz, 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
1MRS759144 A
REX640
Product version: 1
52 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