Parameters; Configuration - ABB RELION REB500 Technical Manual

Section 5
Bay protection functions
5.3.5

Parameters

Table 71:
Signal
ParSet4..1
c-Setting
k -Setting
1
IStart
t-min
NrOfPhases
CurrentInp
IB-Setting
BlockInp
Trip
Start
5.3.6

Configuration

The following parameters have to be set:
Base current
Characteristic
enabling current
Type of
characteristic
Multiplier
The Inverse time overcurrent function is used to protect transformers, feeders and loads of
the auxiliaries supply system against phase and earth faults. The function responds largely
only to the fundamental component of the fault current.
Base current I
The function does not have a fixed current setting above which it operates and below which it
does not, as does a definite time-overcurrent relay. Instead, its operating characteristic is
selected such that it is always above the load current. To this end, the relay has a reference
current I
current I
current exceeds the reference current by a given amount (IStart). By setting the reference
current I
I < I of the protected unit: the protection is more sensitive
B1 N
96
Inverse time overcurrent function - parameters
Description
Parameter for determining in which set of parameters a particular function is
active.
Setting for the exponential factor determining the operating characteristic
according to BS 142 or for selecting the RXIDG characteristic.
Constant determining the parallel shift of the characteristic (time grading).
Pick-up current at which the characteristic becomes effective.
Definite minimum tripping time.
Defines the number of phases measured.
Defines the CT input channel.
All current I/P's may be selected.
Base current for taking account of differences of rated current I
Defines the input for an external blocking signal.
• F: not used
• T: function always blocked
• xx: all binary inputs (or outputs of protection functions).
Tripping signal.
Pick-up signal.
I -Setting
B
IStart
c-Setting
k -Setting
1
-Setting
B
that is set the same as the load current of the protected unit I
B
determines the relative position of the relay characteristic which is enabled when the
B
to equal the load current of the protected unit I
B
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1MRK 505 406-UEN B
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.
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. The reference
B1
instead of its rated current, for
B1
Bay protection functions REB500
Technical manual