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63230-216-229-B1
Installation
Base Unit
Connecting Residual Current Inputs
Variant 4: Measuring Residual Current by 1A or 5A CTs and CSH30 Interposing Ring CT
DE80130
Description
The CSH30 interposing ring CT connects 1A or 5A CTs to Sepam™ to measure
residual current:
b CSH30 interposing ring CT connected to 1A CT: make two turns through CSH
primary
b CSH30 interposing ring CT connected to 5A CT: make four turns through CSH
primary.
Parameters
Residual Current Rated Residual Current Measuring Range
1 A CT I
Nr = IN, CT primary current 0.01 to 20 INr (minimum 0.1 A)
5 A CT I
Nr = IN, CT primary current 0.01 to 20 INr (minimum 0.1 A)
DE80131
Variant 5: Measuring Residual Current by Zero Sequence CT with Ratio of 1/n (n between 50 and 1500)
DE80102
Description
The ACE990 is an interface between a MV zero sequence CT with a ratio of
1/n (50 ≤ n ≤ 1500) and the Sepam™ residual current input.
This arrangement allows the continued use of existing zero sequence CTs on the
installation.
Parameters
Residual Current Rated Residual Current Measuring Range
ACE990 - range 1 I
Nr = Ik.n
(1)
0.01 to 20 INr (minimum 0.1 A)
(0.00578
≤ k ≤ 0.04)
ACE990 - range 2 I
Nr = Ik.n
(1)
0.01 to 20 INr (minimum 0.1 A)
(0.0578
≤ k ≤ 0.26316)
(1) n = number of zero sequence CT turns
k = factor to be determined according to ACE990 wiring and setting range used by Sepam™
turns
turns
Ic
a b c
Ib
Ia
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