在交流电车的地板下,安装了作为电车驱动及辅助回路的电源用主变压器,过去它的冷却采用了由电动鼓风机强制风冷的方式。现在日本三菱电机公司开发了利用车辆行驶时的自然风冷却主变压器的新冷却方式,已实行应用,见附图。最近装入东日本旅客铁 Under the floor of the AC trolley, a main transformer for power supply installed as a driving and auxiliary circuit for the trolley was installed. In the past, it was cooled by means of forced air cooling by an electric blower. Now Japan’s Mitsubishi Electric Corporation developed the use of natural wind cooling vehicle when the main cooling of the transformer has been implemented, see the attached drawings. Recently loaded with East Japan Passenger Iron