ABB RELION REX640 Technical Manual page 1038

Protection functions
4.7.4.11 Technical revision history
Table 969: UZPDIS Technical revision history
Product
connectivi
ty level
PCL4
4.7.5 Directional negative sequence impedance protection
DNZPDIS (ANSI Z2Q)
4.7.5.1 Identification
Function description
Directional negative sequence im-
pedance protection
4.7.5.2 Function block
Figure 577: Function block
4.7.5.3 Functionality
Directional negative sequence impedance protection function (DNZPDIS) is used to
detect the unsymmetrical fault such as the phase to phase fault, phase-ground fault
and double phase to ground fault on power system network.
Operating principle is based on negative sequence impedance. Function compares
the negative sequence impedance value against given setting values. Directional
operation is based on following theory, impedance value is positive for forward
faults and negative for reverse faults. Operate time is according to definite time
characteristics.
4.7.5.4 Analog channel configuration
DNZPDIS has two analog group inputs which must be properly configured.
1038
Technical Change
revision
C Support for separate zones with an offset mho characteristic.
IEC 61850 IEC 60617
identification identification
DNZPDIS Z2 ->
1MRS759142 F
ANSI/IEEE C37.2
device number
Z2Q
REX640
Technical Manual