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A
Appendix
Ground Fault Current Measuring
3-Wire Power System
Method
Number
Measurement
Method
Measurement
Range
Setting Range Core
Bal. CT
Connections IN (Source)
Setting
Rating
(I
Nr)
1A (CT
and LPCT)
Internal Phase
Current
Summation
0.01 to 40 Inr
(minimum 100
mA)
DT=0.01 to 15
I
Nr
IDMT=0.01 to
1.0 I
Nr
None "None" I
N of
phase
CTs
2A Ext. sum of 3
standard 1A or
5A CT with
CCA634 conn.
0.01 to 40 I
Nr
(minimum 100
mA)
DT=0.01 to 15
I
Nr
IDMT=0.01 to
1.0 I
Nr
None 5A CT (or 1A)
CSH30/
CCA634
I
N phase
CTs
3A Std 1A or 5A
Zero
Sequence CT
with CCA634
conn.
0.01 to 20 I
Nr
(minimum 100
mA)
DT=0.01 to 15
I
Nr
IDMT=0.01 to
1.0 I
Nr
Standard
1A or 5A
Zero
Sequenc
e
5A CT (or 1A)
CSH30/
CCA634
I
Nr Zero
Sequence
CT
4A Std 1A or 5A
Zero
Sequence CT
w/ CSH30 Aux
CT
0.01 to 20 I
Nr
(minimum 100
mA)
DT=0.01 to 15
I
Nr
IDMT=0.01 to
1.0 I
Nr
Standard
1A or 5A
Zero
Sequence
5A CT (or 1A)
CSH30/
CCA634
I
Nr Zero
Sequence
CT
5A* External sum
of 3 Std 1A or
5A CT w/
CSH30 Aux
CT
0.01 to 40 I
Nr
(minimum 100
mA)
DT=0.01 to 15
I
Nr
IDMT=0.01 to
1.0 I
Nr
CSH30 5A CT (or 1A)
CSH30/
CCA634
I
N Phase
CTs
6A* Specific CSH
Zero
Sequence CT
on 2A Input
Rating
0.01 to 40 I
Nr DT=0.01 to 30A
IDMT=0.1 to 2A
CSH120
CSH200
CSH120/200
0.2A rating
2A
7A Specific CSH
Zero
Sequence CT
on 20A Input
Rating
0.02 to 400 I
Nr DT=0.2 to 300A
IDMT=0.2 to
20A
CSH120
CSH200
CSH120/200 20A
8A High Ratio
1A or 5A
Zero
Sequence CT
w/ACE990
Aux CT
0.01 to 20 I
Nr
(minimum 100
mA)
DT=0.01 to 15
I
Nr
IDMT=0.01 to
1.0 I
Nr
High
Ratio 1A
or 5A
Zero
Sequenc
e
"ACE990
Range 1"
[k<0.05] or
"Range 2"
[k>0.l05]
k times
number of
turns zero
sequence
CT
** min. setting =
100 mA except
methods 6, 7
CCA630/
CCA634
Ib
Ic
a
b
c
Ia
c
b
a
Ic
Ib
Ia
c
b
a
Ic
Ib
Ia
turns
turns
Ic
a b c
Ib
Ia
Commentaires sur ces manuels