TECHNICAL INFORMATION
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Power and Energy. Naturally. Requirements for medium and low- voltage transformers connected to Sirio Central Inverters MT range.

Power and Energy. Naturally. Summary This document describes the requirements of medium or low-voltage transformers that are connected to Sirio Central Inverters HV-MT. AROS Solar Technology disclaims any responsability for supply of transformers that have not been purchased through its sales network.

Power and Energy. Naturally. Technical properties for medium-voltage transformers In case the medium-voltage transformers are not supplied from AROS Solar Technology, please pay attention that the transformers have the following technical features: 1. The transformer must be suitable for operation with PWM inverters that have a waveform regarding ground similar to that shown in the following diagram. 2. The transformer must be designed for the voltages that arise during pulsed operation of the inverter. In the worst case of the pole ground the voltages can reach a magnitude of maximum 1200V...

Power and Energy. Naturally. Example of connection with 1 Sirio HV –MT Inverter Example of connection with 2 Sirio HV –MT Inverters Example of connection with 3 Sirio HV –MT Inverters 6. The medium-voltage transformer may be 10KV, 15KV, 20KV, 22KV, 25KV, 30KV or 35KV. However, it may be necessary to connect Sirio Inverters HV-Mt to the low-voltage grid. In this case upper voltages of 400V or 415V are usual.

Power and Energy. Naturally. 7. The impedance voltage Z (%) of the transformer must, in relation to every inverter, be 6% in each case. Impedance voltage tolerance is 10%. 8. During thermal rating, the load curve and the ambient conditions at the respective installation site should be taken into account. 9. No neutral point is required on the low voltage side. If a neutral point is nevertheless present on the low‑voltage side, this neutral point must not be either connected or grounded. NOTE FOR THE INSTALLATION We would remind that the connecting cables between the Sirio Inverter HV-MT and...