Power Electronics VS 65130 2, Руководство по аппаратному обеспечению и установке

Страница: 29 / 51

POWER ELECTRONICS
VS65 SERIES MV SOFT STARTER
WIRING ACCESS AND CONNECTION
27
Figure 6.4 Fuse characteristics (160A, 200A)-7.2kV (Source: LS System Industries Co.)
Therefore, it is not recommended to install the soft starter in points where the short-circuit current
available is higher than 40kA. If so, install general fuses with a greater breaking capacity and with
fastest interrupting capacity.
6.1.2. Ground fault protection relay (Optional)
The VS65 SS integrates as standard a current imbalanced protection with a threshold of 40%.
Optionally it can include an electronic earth leakage protection relay. The relay measures the sum
of the three phase input currents through the input toroid. When the current imbalance is greater
than the configured threshold the soft starter will perform an emergency STOP opening the
bypass contactor.
SAFETY
GROUND FAULT MONITORING
The installer must ensure the current imbalance threshold to ensure personal safety and fire protection
according to the local regulations.