ABB REX640 User Manual

Table 100. Three-phase overload protection for shunt capacitor banks (COLPTOC)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz, and no
harmonics
5% of the set value or 0.002 × I
n
Start time for overload stage
1)2)
Typically 75 ms
Start time for under current stage
2)3)
Typically 26 ms
Reset time for overload and alarm stage Typically 60 ms
Reset ratio Typically 0.96
Operate time accuracy in definite time mode 1% of the set value or ±20 ms
Operate time accuracy in inverse time mode 10% of the theoretical value or ±20 ms
Suppression of harmonics for under current stage DFT: -50 dB at f = n × f
n
, where n = 2,3,4,5,..
1) Harmonics current before fault = 0.5 × I
n
, harmonics fault current 1.5 × Start value , results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
3) Harmonics current before fault = 1.2 × I
n
, harmonics fault current 0.8 × Start value , results based on statistical distribution of 1000 measurements
Table 101. Three-phase overload protection for shunt capacitor banks (COLPTOC) main settings
Parameter
Function Value (Range) Step
Start value overload COLPTOC 0.30...1.50 × I
n
0.01
Alarm start value COLPTOC 80...120% 1
Start value Un Cur COLPTOC 0.10...0.70 × I
n
0.01
Time multiplier COLPTOC 0.05...2.00 0.01
Alarm delay time COLPTOC 500...6000000 ms 100
Un Cur delay time COLPTOC 100...120000 ms 100
Table 102. Current unbalance protection for shunt capacitor banks (CUBPTOC)
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)
Typically 26 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Operate time accuracy in definite time mode 1% of the theoretical value or ±20 ms
Operate time accuracy in inverse definite minimum time mode 5% of the theoretical value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2,3,4,5,..
1) Fundamental frequency current = 1.0 × I
n
, current before fault = 0.0 × I
n
, fault current = 2.0 × Start value , results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
1MRS759144 A
REX640
Product version: 1
ABB 61

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