Sensitive Directional Residual Overcurrent And Power Protection Sdepsde; Identification; Application - ABB RER670 Applications Manual

Section 8
Current protection
8.5
8.5.1
8.5.2
174
2ndHarmStab: The rate of 2nd harmonic current content for activation of the 2nd
harmonic restrain signal. The setting is given in % of the fundamental frequency
residual current.
Sensitive directional residual overcurrent and power
protection SDEPSDE

Identification

Function description
Sensitive directional residual over
current and power protection

Application

In networks with high impedance earthing, the phase-to-earth fault current is
significantly smaller than the short circuit currents. Another difficulty for earth
fault protection is that the magnitude of the phase-to-earth fault current is almost
independent of the fault location in the network.
Directional residual current can be used to detect and give selective trip of phase-
to-earth faults in high impedance earthed networks. The protection uses the
residual current component 2I
current and the residual voltage (-2U
Alternatively, the function can be set to strict 2I
Directional residual power can also be used to detect and give selective trip of
phase-to-earth faults in high impedance earthed networks. The protection uses the
residual power component 2I
residual current and the reference residual voltage, compensated with a
characteristic angle.
A normal non-directional residual current function can also be used with definite or
inverse time delay.
A backup neutral point voltage function is also available for non-directional
residual overvoltage protection.
In an isolated network, that is, the network is only coupled to earth via the
capacitances between the phase conductors and earth, the residual current always
IEC 61850 IEC 60617
identification identification
SDEPSDE
IEC15000260 V1 EN-US
· cos φ, where φ is the angle between the residual
0
), compensated with a characteristic angle.
0
level with a check of angle φ.
0
· 2U · cos φ, where φ is the angle between the
0 0
1MRK 506 375-UEN A
SEMOD171436-1 v4
SEMOD172025-2 v4
ANSI/IEEE C37.2
device number
67N
IN>
SEMOD171959-4 v12
Railway application RER670 2.2 IEC
Application manual