Hitachi Relion 670 Series Applications Manual page 315

1MRK506375-UEN Rev. N
EqualBandHigh: To set the equal condition high band limit in % of reference value. This high band
limit will act as reset limit for INHIGH output when INHIGH.
EqualBandLow: To set the equal condition low band limit in % of reference value. This low band limit
will act as reset limit for INLOW output when INLOW.
14.14.5 Setting example
Let us consider a comparison is to be done between current magnitudes in the range of 90 to 110
with nominal rating is 100 and the order is kA.
For the above condition the comparator can be designed with settings as follows,
EnaAbs = Absolute
RefSource = Set Value
SetValue = 100
RefPrefix = Kilo
EqualBandHigh = 5.0 % of reference value
EqualBandLow = 5.0 % of reference value
Operation
The function will set the outputs for the following conditions,
INEQUAL will set when the INPUT is between the ranges of 95 to 105 kA.
INHIGH will set when the INPUT crosses above 105 kA.
INLOW will set when the INPUT crosses below 95 kA.
If the comparison should be done between two current magnitudes then those current signals need
to be connected to function inputs, INPUT and REF. Then the settings should be adjusted as below,
EnaAbs = Absolute
RefSource = Input REF
EqualBandHigh = 5.0 % of reference value
EqualBandLow = 5.0 % of reference value.
Railway application RER670
Application manual
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Section 14
Logic
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