Reliable power supply in the voltage range up to DC 1000 V
DC grids are already indispensable in rail technology, data centres, in the power supply of ships or in photovoltaic systems. The possibility of storing DC from renewable energies in battery storage and retrieving it when needed will lead to the further spread of DC grids. For example, in the charging infrastructure of electric vehicles or industry. Whereas electricity used to be supplied from an AC grid – usually across several voltage levels – and converted into DC in a decentralised manner and with losses, a DC grid with central rectification and the integration of renewable energy sources reduces the amount of wiring and conversion losses. For example, the rectification in variable-speed drives of conveyor belts or robotic drives in highly automated production plants is no longer necessary.
The reliability of such power supplies is of the highest importance. In the event of deviations from the target state, control processes must be initiated to stabilise the voltage or, in extreme cases, a shutdown must be carried out. The narrow 22.5 mm DC voltage relay UG 9831 from the VARIMETER series measures the voltage in the wide voltage range from DC 20 to 1000 V and monitors for undervoltage and overvoltage based on the set response thresholds. The response thresholds are precisely set using a latching rotary switch on the front panel, protected against manipulation by a sealable transparent cover and deviations from the setpoint are signalled via potential-free changeover contacts in order to initiate countermeasures. If continuous measurement data is required, the UG 9431 device version with integrated Modbus RTU interface offers easy parameterisation, monitoring and diagnostics of DC systems. Changeover contacts are also available on this device for signalling or controlling signal lamps.
DC systems are gaining in importance due to their economic and ecological advantages. Thus, the DC voltage relays of the VARIMETER series are suitable for many future-oriented applications.
