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自关断器件对牵引逆变器来说具有许多益处,囚为它们不必借助于具有一定幅值的输入电压就可变换大电流;这一点能扩大逆变器的经济运用领域。这样,在主牵引驱动中采用GTO晶闸管,在辅助驱动中采用晶体管,可取消强迫换流。一台大功率GTO逆变器的费用,相当一部分取决于使GTO元件兔受开通冲击的吸收电路和防止短路的保护措施。低功耗非对称Undeland吸收电路能给出最佳的综合性能。大功率GTO逆变器采用液浸冷却系统有许多优点。氟里昂(R113)蒸发冷却非常有效,尤其与水中冷系统结合使用更是如此。这种1400kVA的牵引逆变器首次用在供给RuhrkohleAG公司的4台电传动内燃机车上。 4台独立的晶体管逆变器远过一台GTO半桥逆变器与主直流环连接,并为驱动辅助系统的三相交流电机供电。驱动功率根据实际需要来控制,此外,在动力制动期间利用制动能量。
Self-turn-off devices have many benefits for traction inverters because they allow large currents to be switched without resorting to input voltages of a certain magnitude; this can expand the economics of inverter operation. In this way, GTO thyristors are used in the main traction drive, and transistors are used in the auxiliary drive to forcibly de-energize the converter. The cost of a high-power GTO inverter depends, in large part, on the absorption circuit that enables the GTO element to be switched on and the protection against short circuits. Low-power asymmetric Undeland absorption circuit gives the best overall performance. High-power GTO inverter liquid immersion cooling system has many advantages. Freon (R113) evaporative cooling is very effective, especially in combination with cold water systems. This 1400 kVA traction inverter was first used on 4 electric drive diesel engines supplied to Ruhrkohle AG. Four stand-alone transistor inverters are connected to the main DC link far beyond a GTO half-bridge inverter and power the three-phase AC motor driving the auxiliary system. The drive power is controlled according to actual needs, furthermore, the brake energy is utilized during dynamic braking.