Seg WI Series User Manual

9.1.4
Phase Current Measurement
The measuring inputs for phase currents are matching the allocated CTs. Moreover, the
power requirement of the relay and the CT output power match.
CAUTION!
It is not permissible to connect common CTs with secondary currents of 1 A or 5 A to the
measuring inputs.
Nominal frequency: 50 Hz / 60 Hz
Nominal Current (at the CT inputs of the WIC1): 83.33 mA
75 mA at In = 0.9 In
,min
Remark: These values equal in every respect
the nominal current data of the previous/
original version of the WIC1 so that full
compatibility is guaranteed.
Max. Measuring Range: 20 × highest rated CT current
Capacity: permanently: 2.5 × highest rated CT current
Thermal load capacity: 1 s: 25 kA CT primary current
Screws
• Inputs for WIC1 CTs:•
M3 slotted, tightening torque 0.5 Nm
(4.4 lb⋅in)
• Inputs for Broad-Range CTs:•
M2 slotted, tightening torque 0.22 Nm
(1.9 lb⋅in)
9.1.5
Ground Current Measurement
CAUTION!
The measuring input for ground (earth) current is permissible only for a CT with
secondary current of 1 A.
Ground Current Input:
Nominal Current: 1 A
Max. Measuring Range: Up to 20 x In
Capacity: 4 x In/continuously
206 WIC1 WIC1-1.0-EN-MAN
9 Technical Data
9.1.4 Phase Current Measurement

Seg WI Series Specifications

General

Brand	Seg
Model	WI Series
Category	Relays
Language	English