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63230-216-229-B1
Installation
Base Unit
Connecting Residual Current Inputs
Variant 1: Calculating Residual Current by Sum of Three Phase Currents
Description
Residual current is calculated by vectorially summing the three phase currents Ia, Ib
and Ic, which are measured by three x 1A or 5A CTs or by three LPCT type sensors.
See the current input connection diagrams for more information.
Parameters
Residual Current Rated Residual Current Measuring Range
Sum of the three currents I
Nr = IN, CT primary current 0.01 to 40 INr (minimum 0.1 A)
Variant 2: Measuring Residual Current by CSH120 or CSH200 Zero Sequence CT (Standard Connection)
DE80083
Description
Use this arrangement to protect isolated or compensated neutral systems having
very low fault currents that need to be detected.
Parameters
Residual Current Rated Residual Current Measuring Range
2 A rating CSH I
Nr = 2 A 0.1 to 40 A
20 A rating CSH I
Nr = 20 A 0.2 to 400 A
Variant 3: Measuring Residual Current by 1A or 5A CTs and CCA634
DE80086
Description
Residual current measurement by 1A or 5A CTs
b Terminal 7: 1A CT
b Terminal 8: 5A CT
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)
DE80087
c
b
a
Ic
Ib
Ia
c
b
a
Ic
Ib
Ia
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