Negative-Sequence Overvoltage Protection Nsptov; Identification; Function Block; Functionality - ABB RELION REX640 Technical Manual

1MRS759142 C
4.5.5
4.5.5.1
4.5.5.2
4.5.5.3
4.5.5.4
REX640
Technical Manual
Characteristic
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Positive-sequence voltage before fault = 0.0 × U
frequency injected from random phase angle
2) Measured with static signal output (SSO)

Negative-sequence overvoltage protection NSPTOV

Identification

Function description
Negative-sequence overvoltage
protection

Function block

GUID-5501CB0F-4646-462C-8547-B060621D0CF6 V1 EN
Figure 431: Function block

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.

Analog channel configuration

NSPTOV has one analog group input which must be properly configured.
Table 745: Analog inputs
Input
U3P
Protection functions
Value
<35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f
, f = 50 Hz, positive-sequence overvoltage of nominal
n n
IEC 61850 IEC 60617
identification identification
NSPTOV U2>
Description
Three-phase voltages
Section 4
, where n = 2, 3, 4, 5,...
n
ANSI/IEEE C37.2
device number
59NS
791