INSTALLATION GUIDE
MODULAR SUNWAY TG
TE OD
Rev. 03
– 01/06/2018
85/
139
The standard MODULAR SUNWAY TG TE has a PV field connection separate from earth and incorporates
a device for controlling field loss of isolation to earth.
Installation of the Earthed option modifies the electrical status of the field conductors which could therefore
be at a hazardous potential regards earth. It is therefore necessary to adopt measures to guarantee
personnel safety.
Example with Hard Grounding Positive Earthed option
Even under no-fault conditions, in case of inadvertent contact with the negative pole, a fault loop occurs,
supplied by the PV field, that closes through the fuse and the operator’s body. In the event of inadvertent
contact with the negative pole, the fault current is limited only by the resistance of the operator's body and
is an electric risk for the operator.
Figure 54: Direct contact with live pole (even under no-fault conditions)
WARNING
The isolation to earth control of the PV field poles is NOT active.
In addition, in case of fault, the electric status of the PV field may change due to the fault itself and the fact
that the earth fuse blows. In particular, should the fault persist, the positive pole may have a dangerous
potential in respect to ground. In case of inadvertent contact with the negative pole, a fault loop occurs,
supplied by the PV field, that closes through the fuse and the operator’s body. In the event of inadvertent
contact with the negative pole, the fault current is limited only by the resistance of the operator's body and
is an electric risk for the operator.
Figure 55: Direct contact on a non-earthed pole due to earth fault on the other pole
8.3.
Hard grounding
– Earth ground fault detection
