Siemens 8DB10 - Current and Voltage Transformers; Voltage Transformers

Description
28/214 Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
12 Current and voltage transformers
12.1 Voltage transformers
Features • According to IEC 60044-2
• Cast-resin insulated
•Inductive type
• Safe-to-touch due to metal enclosure
Voltage transformer types
Electrical data
Fig. 12: Voltage transformer installation (basic scheme)
①
Busbar voltage transformer 4MT3
③
Voltage transformer 4MU4 with
three-position disconnector
②
Feeder voltage transformer 4MT7
(connection at panel connection housing)
④
Feeder voltage transformer 4MU3 (not in
the panel, connection via flexible cable with plug
size S2 at the panel connection housing, and
metal-enclosed voltage transformer)
Mounting locations Type Comment
Busbar 4MT3 optionally with three-position disconnector
4MU4
Panel connection 4MU3 external
4MT7 directly pluggable
Designation 4MT3 4MU4 4MT7 4MU3
Operating voltage kV 3.3 to 23.0 24.0 to 38.0 3.3 to 38.0 3.3 to 38.0
Rated voltage kV 24.0 40.5 40.5 40.5
Rated short-duration power-frequency
withstand voltage kV
65.0 95.0 95.0 95.0
Rated lightning impulse withstand voltage kV 125.0 200.0 200.0 200.0
Rated voltage factor Un / 8h = 1.9 Un / 8h = 1.9 Un / 8h = 1.9 Un / 8h = 1.9
Un / continuous = 1.2 Un / continuous = 1.2 Un / continuous = 1.2 Un / continuous = 1.2
Standard IEC IEC IEC IEC
GOST GOST GOST GOST
GB GB GB GB