861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11 113/214
Installation
➭ To let excess air out of the plug connection while mounting the voltage transformer, fit a
nylon thread or a cable strap into the inside cone of the voltage transformer mounting plate.
➭ Insert the primary terminal of the voltage transformer slowly into the inside cone of the
mounting plate, pulling the cable strap out at the same time.
➭ Connect the low-voltage plug connector to the voltage transformer.
➭ Fasten the voltage transformer at the panel. To do this, bolt the voltage transformer
uniformly together with the voltage transformer mounting plate using four M8 bolts.
Tightening torque: 30 Nm.
Fig. 130: Fastening the voltage transformer
24.3 Installation of voltage transformers type 4MT7 at the cable feeder
➭ Isolate and earth the cable feeder.
➭ Verify safe isolation from supply.
CAUTION
Disruptive discharges due to air inclusions
Will damage the cast-resin bushing.
➭ While installing the voltage transformer, let excess air out of the plug-in connection with a
cable strap.
➭ Verify intact condition of the cable strap. If the cable strap was damaged when it was
pulled out, remove the voltage transformer and eliminate the residues of the cable strap.
Fig. 131: 4MT7 voltage transformer
①
Panel connection housing
②
Inside-cone bushing for primary
terminal of transformer
③
Primary terminal at the voltage
transformer
④
Silicone adapter
⑤
Fixing bracket (fastened to the
voltage transformer housing)
⑥
4MT7 voltage transformer
⑦
Low-voltage plug connector
⑧
Inside-cone bushing for cable
⑨
Panel connection cover
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