With the change of environment and indoor heat load, the refrigeration and air-conditioning system almost operate at varying condition.
随着环境和室内热负荷的变化，制冷空调系统通常是在变工况条件下运行。
Traction load varies rapidly for multi-factors such as rail condition, so traction load harmonic also has random time-varying characteristic.
由于电气化铁道牵引负载受线路条件等多种因素影响而波动剧烈，因此产生的谐波也具有随机波动性。
Traction load varies rapidly for multi-factors such as rail condition, so traction load harmonic also has random time-varying characteristic.
由于电气化铁道牵引负载受线路条件等多种因素影响而波动剧烈，因此产生的谐波也具有随机波动性。
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