Supplementary Information For Binary Outputs; Inverse Time Earth Fault Overcurrent Protection 51N (I0Inv); Mode Of Operation; Features - ABB RELION REB500 Technical Manual

Section 5
Bay protection functions
Ext Start L1. Ext Start L2, Ext Start L3, Ext Trip 3P, Ext Trip
These inputs are for coordinating operation with the distance protection function. To them
are connected the distance function signals Start L1, Start L2, Start L3, Trip CB 3P and Trip
CB.
They must be set to
5.9.6.13

Supplementary information for binary outputs

Trip
There are two Trip signals, one for energizing the tripping relay via the tripping logic and the
other for controlling LEDs and signaling contacts.
Start
An active Start output signals that the zero-sequence current has exceeded the pick-up
setting
MeasFwd
MeasFwd is active when the measuring element detects a fault in the forwards direction, that
is, the settings of
MeasBwd
MeasBwd is active when the measuring element detects a fault in the backwards direction,
that is, the settings of
Send
The Send output is the signal sent to the remote end of the line.
Receive Inhibit
The Recve Inh signal prevents the distance function from receiving a PLC signal (see
5.9.6.1). It is only generated when the parameter
the ground fault protection picks up for a reverse fault.
The signal Recve Inh must be connected to the distance function input ExtBlkHF.
5.10 Inverse time earth fault overcurrent protection 51N
(I0INV)
5.10.1

Mode of operation

Overcurrent function with inverse time characteristic. A typical application is as back-up for
the ground fault protection function, in which case it measures 3 I0 either supplied from an
external source or internally derived.
5.10.2

Features

• Tripping characteristic according to British Standard 142:
c = 0.02: normal inverse
c = 1: very inverse and long time earth fault
168
F if an independent directional ground fault scheme is in use.
I-Setting . This signal is only generated providing the function is not blocked.
I-dir and V-setting have been exceeded.
I-dir and V-setting have been exceeded.
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1 Channel is set, the basic time has expired or
Bay protection functions REB500
1MRK 505 406-UEN B
GUID-C44B0120-A06C-4E67-9516-5FCFD1329619 v1
Section
GUID-E5F6C837-2144-4F8A-AA85-43A583DE3E31 v1
GUID-65205166-1E80-4340-989B-7ADB304A4F83 v1
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