ABB ret650 - Technical Data; Load Encroachment LEPDIS; Functionality; Identification

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