Current Transformers - Siemens 8DA10 Series Installation And Operating Instructions Manual

Features
Mounting locations
Electrical data
861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11
10.2

Current transformers

• According to IEC 61869-2 or EN 61869-2 (depending on the switchgear version)
• Designed as ring-core current transformers:
- Ring core as carrier of secondary winding
- Main circuit corresponds to primary winding
• Arranged outside the primary enclosure (switchgear housing) due to single-pole design of
the panel
• Free of dielectrically stressed cast-resin parts
• On the busbar
• At the panel connection
• On the cable
Fig. 9: Current transformer installation (basic scheme)
①
Busbar current transformer (type 4MC4_40)
② Feeder current transformer (type 4MC4_90)
Designation
Operating voltage
Rated short-duration power- frequency withstand voltage
(winding test)
Rated frequency
Rated continuous thermal current
Rated thermal short-time current, max. 3 s
Rated current dynamic
primary
secondary
Multiratio (secondary)
Core data according to rated primary current
Measuring core Rating
Class
Overcurrent factor
Protection core Rating
Class
Overcurrent factor
Permissible ambient air temperature
Insulation class
③
Feeder current transformer (type 4MC4_10)
④ Current transformer on bus sectionalizer
(type 4MC4_40)
Type 4MC4
max. 800 V
3 kV
50/60 Hz
max. 1.2 x rated current (primary)
max. 40 kA
unlimited
40 A to 2500 A
1 A And 5 A
200 A - 100 A to 2500 A - 1250 A
max. 3 cores
2.5 VA to 30 VA
0.2 to 1
FS 5, FS 10
2.5 VA to 30 VA
5 P or 10 P
10 to 30
max. 60 °C
E
Description
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