ABB SPAC 531 C User Manual And Technical Description page 128

1MRS 750350-MUM EN
Issued 1996-03-14
Modified 2000-02-16
Version C (replaces 34 SPCS 1 EN1)
Checked
Approved
Data subject to change without notice
Contents
Features
2
Features .......................................................................................................................... 2
Description of operation ................................................................................................. 3
Block schematic diagram ................................................................................................ 4
Front panel ..................................................................................................................... 5
Operation indicators ....................................................................................................... 5
Settings ........................................................................................................................... 6
Selector switches ............................................................................................................. 7
Measured data ................................................................................................................ 9
Recorded information (modified 2000-02).................................................................... 10
Main menus and submenus of settings and registers ..................................................... 12
Technical data (modified 2000-02) ............................................................................... 13
Event codes ................................................................................................................... 14
Remote transfer data (modified 2000-02) ...................................................................... 15
Fault codes.................................................................................................................... 18
Directional neutral overcurrent relay module
with definite time characteristic for earth fault
protection
Two neutral overcurrent stages, a low-set stage
Iϕ> and a high-set stage Iϕ>>
The high-set stage can be given the same or the
opposite direction of operation as compared
with the low-set stage
I sinϕ or I cosϕ operation characteristic se-
0 0
lected locally by switches or by remote control
over the external control input
Overcurrent relay module
Four selectable start values for the residual volt-
age
Digital display of measured values, set values
and recorded fault values
Continuous self-supervision with autodiagnos-
tics including both hardware and software
Serial communication capability for extensive
data exchange between the relay module and the
substation level communication or control sys-
tem
SPCS 3C4