ABB REX640 User Manual

Table 84. Positive-sequence overvoltage protection (PSPTOV)
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 × U
n
Start time
1)2)
Minimum Typical Maximum
U
Fault
= 1.1 × set Start value
29 ms 32 ms 34 ms
U
Fault
= 2 × set Start value 32 ms 24 ms 26 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
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Positive-sequence voltage before fault = 0.0 × U
n
, f
n
= 50 Hz, positive-sequence overvoltage of nominal frequency injected from random phase angle
2) Measured with static signal output (SSO)
Table 85. Positive-sequence overvoltage protection (PSPTOV) main settings
Parameter
Function Value (Range) Step
Start value PSPTOV 0.400...1.600 × U
n
0.001
Operate delay time PSPTOV 40...120000 ms 10
Table 86. Positive-sequence undervoltage protection (PSPTUV)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured voltage: f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Minimum Typical Maximum
U
Fault
= 0.99 × set Start value
U
Fault
= 0.9 × set Start value
52 ms
44 ms
55 ms
47 ms
58 ms
50 ms
Reset time Typically 40 ms
Reset ratio Depends on the set Relative hysteresis
Retardation time <35 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Start value = 1.0 × U
n
, positive-sequence voltage before fault = 1.1 × U
n
, f
n
= 50 Hz, positive sequence undervoltage 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
Table 87. Positive-sequence undervoltage protection (PSPTUV) main settings
Parameter
Function Value (Range) Step
Start value PSPTUV 0.010...1.200 × U
n
0.001
Operate delay time PSPTUV 40...120000 ms 10
Voltage block value PSPTUV 0.01...1.00 × U
n
0.01
1MRS759144 A
REX640
Product version: 1
56 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