Parameters; Configuration - ABB RELION REB500 Technical Manual

Section 5
Bay protection functions
5.10.5

Parameters

Table 92: Inverse time earth fault overcurrent function - parameters
Signal
ParSet4..1
CurrentInp
c-Setting
k1-Setting
IStart
tmin
NrOfPhases
IB-Setting
BlockingInp
Trip
Start
5.10.6

Configuration

Protection function enable IStart
The function starts to run when the current applied to the function exceeds the setting
IStart is normally set to 1.1 IB .
Choice of tripping characteristic c-Setting
The shape of the IDMT characteristic is determined by the constant c.
The standard IDMT characteristics according to BS 142 are:
normal inverse:
very inverse and long time earth
fault:
extremely inverse:
170
Description
Parameter for determining in which set of parameters a particular function is
active.
Defines the CT input channel. All the current channels are available for selection.
Setting for the exponential factor determining the shape of the operating
characteristic according to BS 142 or for selecting the RXIDG characteristic.
Tripping characteristic constant
Pick-up setting (initiates the tripping characteristic).
Definite minimum time of the tripping characteristic.
Number of phases evaluated for measurement:
• 1: neutral current direct from an CT input
• 3: neutral current derived internally from the three phases
Reference current to take account of discrepancies with respect to IN.
I/P for the external blocking signal.
• F: unused
• T: function always blocked
• xx: all binary I/P's (or O/P's of protection functions)
Tripping signal
Pick-up signal
c = 0.02
c = 1.00
c = 2.00
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IStart .
Bay protection functions REB500
Technical manual