ABB RELION REX640 Technical Manual page 875

1MRS759142 F
Characteristic
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite
time mode
Suppression of harmonics
4.5.5 Negative-sequence overvoltage protection NSPTOV (ANSI
59NS)
4.5.5.1 Identification
Function description
Negative-sequence overvoltage
protection
4.5.5.2 Function block
Figure 490: Function block
4.5.5.3 Functionality
The negative-sequence overvoltage protection function NSPTOV is used to detect
negative sequence overvoltage conditions. NSPTOV is used for the protection of
machines.
The function starts when the negative sequence voltage exceeds the set limit.
NSPTOV operates with the definite time (DT) characteristics.
The function contains a blocking functionality. It is possible to block function
outputs, the definite timer or the function itself.
1
Positive-sequence voltage before fault = 0.0 × U
nominal frequency injected from random phase angle
2
Measured with static signal output (SSO)
REX640
Technical Manual
1, 2
U = 1.1 × set
Fault
Start value
U = 2.0 × set
Fault
Start value
Value
Minimum Typical
29 ms 32 ms
32 ms 24 ms
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
IEC 61850 IEC 60617
identification identification
NSPTOV U2>
, f = 50 Hz, positive-sequence overvoltage of
n n
Protection functions
Maximum
34 ms
26 ms
ANSI/IEEE C37.2
device number
59NS
875