Undershoot Undershoot refers to the amount by which voltage or frequency drops below the nominal value as the voltage regulator or governor responds to changes in load.
下超调下超调指电压调整器或控制器在应对负荷变化时，电压或频率低于额定的量。
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The load transfer of B0+B0-B0+B0 locomotive with different traction schemes was calculated, basing on the definition of nominal and transitional and equivalent traction height.
With the detection system, traction load test not on the line is possible for the locomotive after mid-haul, and locomotive faults could be located as well that nominal parameters could be adjusted.