Problem description After installing a second photovoltaic system on a low-voltage grid with a high proportion of inverters, frequent faults were detected in the first and larger solar system. The inverters of this system, but also of the newer PV system, frequently switched off with the message “grid fault”. During a grid quality measurement carried […]
For some years now, one has repeatedly recognised power electronic feeders, such as photovoltaic inverters, wind turbines and battery storage systems, which show a striking similarity in the current and voltage curve shape. What is desirable and advantageous for purely resistive consumers – namely the pure purchase of active power without fundamental oscillation and harmonic […]
Problem Risks for electrical equipment in installations are often only noticed by listening carefully. This is also the case here, although it is not uncommon in the metalworking industry. The cause of the extreme voltage distortions shown above in a broad frequency spectrum up to slightly above 20 kHz are powerful converters in the presses. […]
Incorrect wiring of an inverter causes problems Problem description Immediately after commissioning an inverter-driven CHP unit, several bus systems failed in the customer’s system. M-Bus, Profibus and Modbus modules were affected. As a result of the bus malfunctions, there were constant error messages and false alarms in the process control and thus also failures of […]