Technical Description; Starters - ABB RELION REB500 Technical Manual

Section 5
Bay protection functions
5.1.7

Technical description

5.1.7.1

Starters

Starting procedure
The REB500sys distance function is equipped with either over-current or underimpedance
starters. The setting of the parameter
A starter must pick up at least twice before its signal is processed (for phase selection,
starting timers, signaling etc.). Should a starter pick up only sporadically, only the backwards
measuring system and ancillary functions such as displaying measurements etc. are enabled.
Starting signals do not reset unless all the starters have reset.
Overcurrent starters (Istart)
The variables at the inputs of the overcurrent starters are the phase currents I
the residual current I
I , that is, the highest of the three-phase currents I
max
If the value of I
the phase currents I
Imin (current enable) and also 80% of I
In the case of the ground current I
parameter
Mode (I
has exceeded the setting of the parameter
The logical signals L1, L2, L3 and E are accordingly set to logical 0 or logical 1. The kind of fault
and the phases involved are thus determined. This information is needed for
• phase selection (determination of the loop to be measured)
• signaling the kind of fault (signaling relays, LEDs etc.)
• enabling signals for tripping and for starting the timers for the measuring zones
The starting signals reset if after measurement, the impedances of all six loops lie outside the
final impedance zone (if only the overcurrent starters are in operation, there is no
underimpedance starting characteristic and relay response is determined by the setting of the
overcurrent starter
52
(3I ), respectively the neutral voltage U
E 0
exceeds the setting of the parameter
max
is checked to determine whether it exceeds the setting of the parameter
ph
3I0min and also 25% of I
, I AND U , I OR U ), it is checked at the same time whether the residual voltage U
0 0 0 0 0
IStart ).
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StartMode determines which of the two is active.
, I
L1 L2
IStart (overcurrent starters), each of
.
max
, it is checked whether it exceeds the setting of the
E
. Depending on the setting of the parameter
max
3U0min (neutral voltage enable).
1MRK 505 406-UEN B
GUID-98795D77-46E5-4F07-B61F-214818EBAD2C v1
GUID-6F77DAB8-B663-4091-872B-A2B590008022 v1
, I
L1 L2
(3U ). Firstly, a logic determines
E 0
and I .
L3
Bay protection functions REB500
Technical manual
and I and
L3
And Fault
E