Sel SEL-421 - Quadrilateral Ground Distance Elements Relay Word Bits; Zone 1 Quadrilateral Ground Distance Element Logic Diagram

R.1.55
Date Code 20111215 Reference Manual SEL-421 Relay
Protection Functions
Quadrilateral Ground Distance Elements
Figure 1.38 Zone 1 Quadrilateral Ground Distance Element Logic Diagram
Table 1.45 Quadrilateral Ground Distance Elements Relay Word Bits
Name Description
XAG1 Zone 1 A-phase quadrilateral ground distance element
XBG1 Zone 1 B-phase quadrilateral ground distance element
XCG1 Zone 1 C-phase quadrilateral ground distance element
XAG2 Zone 2 A-phase quadrilateral ground distance element
XBG2 Zone 2 B-phase quadrilateral ground distance element
XCG2 Zone 2 C-phase quadrilateral ground distance element
XAG3 Zone 3 A-phase quadrilateral ground distance element
XBG3 Zone 3 B-phase quadrilateral ground distance element
XCG3 Zone 3 C-phase quadrilateral ground distance element
XAG4 Zone 4 A-phase quadrilateral ground distance element
XBG4 Zone 4 B-phase quadrilateral ground distance element
XCG4 Zone 4 C-phase quadrilateral ground distance element
XAG5 Zone 5 A-phase quadrilateral ground distance element
XBG5 Zone 5 B-phase quadrilateral ground distance element
XCG5 Zone 5 C-phase quadrilateral ground distance element
CVTBL
XAG1
IAL
IGL
0.1 • I
nom
– RG1 < rAG1 < RG1
xAG1 < XG1
FSA
SPO
3PO
0SB1
67Q1T
ILOP
VPOLV
SERCA
B- and C-Phase Logic Is Similar.
xAG1 is the A-Phase-to-Ground Zone 1 Reactance Calculation.
rAG1 is the A-Phase-to-Ground Zone 1 Resistance Calculation.
+
—
+
—
XGPOL := IG
32VE
32QE
32GF
XGPOL := I2