Technical Data; Load Encroachment Lepdis; Identification; Functionality - ABB RET650 Technical Manual

1MRK 504 135-UEN A
7.2.7
7.3
7.3.1
7.3.2
Technical manual

Technical data

Table 60: ZGCPDIS technical data
Function
Number of zones
Forward positive sequence impedance
Reverse positive sequence impedance
Angle for positive sequence impedance,
Timers
Operate time
Reset ratio

Load encroachment LEPDIS

Identification

Function description
Load encroachment

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.
Impedance protection
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
IEC 61850 IEC 60617
identification identification
LEPDIS -
Section 7
Accuracy
-
± 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
-
-
± 0.5% ± 10 ms
-
-
ANSI/IEEE C37.2
device number
-
137