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ß
V
I
AB·
X
I
AB·
R
×
ZxFwd
AB
I
-
×
ZxRev
AB
I
2
(
)
=
+
×
ZxRev
AB
AB
Vcomp
V
I
1
(
)
=
-
×
ZxFwd
AB
AB
Vcomp
V
I
ANSI09000174_2_en.vsd
ANSI09000174 V2 EN
Figure 69:
Simplified offset mho characteristic and voltage vectors for phase A-to-B
fault.
Operation occurs if 90≤β≤270.
7.2.7
Technical data
Table 61:
ZGCPDIS (21G) technical data
Function
Range or value
Accuracy
Number of zones
3
-
Forward positive sequence impedance
(0.005-3000.000) Ω/
phase
± 2.0% static accuracy
Conditions:
•
Voltage range: (0.1-1.1) x
V
n
•
Current range: (0.5-30) x I
n
•
Angle: at 85 degrees
Reverse positive sequence impedance
(0.005-3000.000) Ω/
phase
-
Angle for positive sequence impedance,
(10-90) degrees
-
Timers
(0.000-60.000) s
± 0.5% ± 10 ms
Operate time
25 ms typically
-
Reset ratio
105% typically
-
Section 7
1MRK 502 048-UUS A
Impedance protection
166
Technical manual
Содержание 650 series
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