7.2.7
Technical data
Table 60:
ZGCPDIS 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 U
r
•
Current range: (0.5-30)
x I
r
•
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
-
7.3
Load encroachment LEPDIS
7.3.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Load encroachment
LEPDIS
-
-
7.3.2
Functionality
Heavy load transfer is common in many power networks and may make fault
resistance coverage difficult to achieve. In such a case, Load encroachment LEPDIS
function can be used to enlarge the resistive setting of the underimpedance measuring
zones without interfering with the load.
Each of the three measuring phase-to-phase loops has its own load encroachment
characteristic.
1MRK 504 135-UEN A
Section 7
Impedance protection
137
Technical manual
Summary of Contents for ret650
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