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全部国产现代电传动内燃机车的牵引电动机其磁场削弱自动换档电路中,采用了各种电磁差动式过渡继电器。但电磁式过渡继电器具有一系列缺点。在牵引工况下有时发生运动部件阻塞、触头表面过热、假动作、电铃工况以及试验台上或者变阻试验中继电器整定值发生变化等。牵引发电机附加极绕阻电阻值的温度偏差,会引起牵引发电机电流I_1同一值下继电器电流绕阻讯号值变化。例如,当附加极绕组温度
All domestic modern electric drive diesel locomotive traction motor weakening its magnetic field automatic shift circuit, using a variety of electromagnetic differential relay. But the electromagnetic transition relay has a series of shortcomings. In the traction conditions sometimes moving parts obstruction, the contact surface overheating, fake action, bell operating conditions and test bench or resistance test relay settings have changed. Traction generator additional winding resistance temperature deviation, will cause the traction generator current I_1 the same value of the relay current around the resistance value changes. For example, when extra pole winding temperature is applied