Technical Data - ABB Relion Technical Manual

Section 7
Impedance protection
7.2.7
166
I X
AB·
× ZxFwd
I
AB
- × ZxRev
I
AB
ANSI09000174 V2 EN
Figure 69: Simplified offset mho characteristic and voltage vectors for phase A-to-B
fault.
Operation occurs if 90≤β≤270.

Technical data

Table 61: ZGCPDIS (21G) technical data
Function
Number of zones
Forward positive sequence impedance
Reverse positive sequence impedance
Angle for positive sequence impedance,
Timers
Operate time
Reset ratio
= -
Vcomp 1 V ( I
AB
ß
V
Vcomp
I
AB·
Range or value
3
(0.005-3000.000) Ω/
phase
(0.005-3000.000) Ω/
phase
(10-90) degrees
(0.000-60.000) s
25 ms typically
105% typically
1MRK 502 048-UUS A
× ZxFwd
)
AB
= + × ZxRev
V I
2 ( )
AB AB
R
ANSI09000174_2_en.vsd
Accuracy
-
± 2.0% static accuracy
Conditions:
• Voltage range: (0.1-1.1) x
V
n
• Current range: (0.5-30) x I
• Angle: at 85 degrees
-
-
± 0.5% ± 10 ms
-
-
Technical manual
n