DC electricity generation and usage, which continues to rise against the environmental impact of AC electricity generation, requires DC switch equipment with higher design properties. The DC is due to the formation of high -energy arcs caused by the absence of 0 point 0, such as AC current. For this reason, protection and control equipment in DC systems are produced differently from the equipment used in AC systems. Similar to alternative current applications, correct current applications should be protected against overload currents, short -circuit currents and excessive voltages.
Correct Current (DC) Protection elements, photovoltaic power plants where solar energy is transformed into DC electrical energy, electric metro-tramway lines, graffiti-metal production facilities, are widely used in the protection of control panels.
Protection of DC systems against extreme currents and extreme voltages
In DC systems, protection against over currents is provided by DC automatic fuses, DC compact switches, DC cylindrical fuses. For example, when we consider a photovoltaic system, solar panels connected to each other form photovoltaic strings. The DC currents produced in these strings are connected to the inverter that stabilizes the frequency and wave form and converted to AC current. Between the strings and the panel, preventive circuit breakers should be used against overflows. The technical values of the circuit breakers to be used are determined by calculating the voltage values of the voltage and current that each cell can provide.
The protection of DC systems against excessive voltage impacts is preferred especially for photovoltaic systems. Considering that solar panels, which can be considered as long -term investments, are installed on open lands and roofs and cover large areas, they are likely to be exposed to lightning blows. In particular, it can be assumed that the voltage impact strengths are low due to electronic components of the inverters used in photovoltaic systems. For this reason, the voltage protection elements to be used before the inverter are protected against excessive voltages due to switching and excessive voltages due to lightning.
As Sigma Electricity, we produce special solutions for DC automatic insurances, DC compact switches, DC cylindrical fuses and DC paraffudrlar and DC systems. Compact circuit cutters with a 1000V DC operating voltage and 36 -cup cutting capacity produce up to 250A and provide protection against excessive currents; The Sigma DC Parafudrlar with a capacity of 40ka discharge provides protection by switching and draining the high currents caused by lightning into the soil. However, Easy Installation and Changeable Cartridges with a working voltage up to 1500V DC Sigma DC cylindrical fuses and 10ka cutting capacity, 1000V DC operating voltage Sigma DC automatic insurance protection functions fully fulfills.