Hitachi 670 Series Application Guide

Setting IED 1 IED 2 Description
IntervIdMinHig 30.000 s 30.000 s Time interval when
IdMinHig is active (note
5)
Idunre 5.50 · IBase 5.50 · IBase Unrestrained operate
(differential) current
limit (note 6)
CrossBlock 1 1 CrossBlock logic
scheme applied (note
7)
I2/I1Ratio 15% 15% Second to fundamental
harmonic ratio limit
I5/I1Ratio 25% 25% Fifth to fundamental
harmonic ratio limit
NegSeqDiff On On Internal/external fault
discriminator enabled
(default)
IminNegSeq 0.04 · IBase 0.04 · IBase Minimum value of the
negative-sequence
current
NegSeqROA 60.0 deg 60.0 deg Operate angle (ROA)
for Internal/external
fault discriminator
(default)
AddDelay Off Off Additional delay
disabled (default)
ImaxAddDelay 1.00 · IBase 1.00 · IBase Not applicable in this
case (default)
CurveType 15 15 Not applicable in this
case (default)
DefDelay 0.100 s 0.100 s Not applicable in this
case (default)
IDMTtMin 0.010 s 0.010 s Not applicable in this
case (default)
TD 0.00 0.00 Not applicable in this
case (default)
p 0.02 0.02 Not applicable in this
case (default)
a 0.14 0.14 Not applicable in this
case (default)
b 1.00 1.00 Not applicable in this
case (default)
c 1.00 1.00 Not applicable in this
case (default)
1MRK505382-UEN Rev. K Section 4
Analog and binary signal transfer for line differential protection
Communication set-up, 670/650 series 35
Application Guide
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Hitachi 670 Series Specifications

General

Brand	Hitachi
Model	670 Series
Category	Control Unit
Language	English