Generated power transmitted at low voltage inside the site

Generated power is transmitted through three PV inverters with an output of 100kW each to the step-down transformer for low voltage, which were set up near the warehouse building (Fig. 6).

Fig. 6: Three 100kW-output PV inverters transmit power to the transformer and power distribution facilities inside the site. TMEIC's 100kW-output PV inverters were set up on the concrete foundations built on the ground (top). The housing of remote monitoring equipment can also be seen. Above these facilities are the transformer and power distribution facilities (bottom) for the internal grid. (source: Nikkei BP)

At Goka Factory, the power received from the extra-high voltage power transmission line is stepped down to high voltage first inside the site before being further stepped down to low voltage at some other locations inside in accordance with the facilities' specifications. The PV generated power is transmitted to the step-down transformer that lowers the received power to low voltage.

Goka Factory does not operate on Sundays. Accordingly, power consumption is less during the day on Sundays, compared with the daytime on weekdays. Yet, the maximum output of solar-based generated power can reportedly be absorbed by the load of the refrigerator-freezers in the warehouses alone.

Although there is traffic busily moving in and out or around the site delivering materials to the factory lines, products being shipped and tours being made inside the factory, Kewpie said coordinating the construction was not too difficult (Fig. 7).

Fig. 7: The solar power generation system was smoothly constructed without being seriously affected by operational suspension caused by snow in late November. (source: Kewpie, Mitsubishi Chemical Engineering)

Facility overview