Insulation monitoring

Early detection of insulation faults 

In PV installations, the generation of energy with as few interruptions as possible and a related high return are in the foreground.

The IT system (unearthed power supply) with insulation monitoring is the first choice for the type of system for the installation, as this is the only type of system in which a first (insulation) fault will not result in shutdown.

With the transformer in the inverter or the (medium voltage) transformer arranged outside the inverter, the essential prerequisite for the IT system is met – electrical isolation in relation to the grid side, such that there is no active conductor on the DC side connected to earth. 

For the continuous monitoring of the insulation resistance between the active conductors and earth, a series iso-PV insulation monitoring device (ISOMETER^®) is used.   Degradations in the insulation are then detected at an early stage, however the system remains in operation.  The ISOMETER^®s in the iso-PV series comply with the requirements of IEC 61557-8 and are specifically intended for use in PV installations, e.g. high system leakage capacitances or slow voltage changes.

Your advantages

• High level of efficiency of the photovoltaic system through the whole service life
• Unexpected maintenance measures are avoided
• Optimised deployment of personnel and planning of time resources
• High installation availability for maximum yield and return

A-ISOMETER^® iso-PV

• Precise measurement of the insulation resistance by patented measuring procedure
• Optimum adaptation to modern photovoltaic systems (presetting for PV systems)
• Easy coupling of several IT systems in large-scale photovoltaic systems