The reason was that over the short distances spanned by early power grids, AC transmission suffers lower losses than DC. It thus became the industry standard.
选择交流电作为工业标准的原因很简单，在早期供电距离很短的电网里，交流电的损耗比直流电小。
Energy losses on DC lines are far lower than on the traditional AC ones, which make transmission of energy over long distances uneconomic.
由于在传输过程中采用高压直流电缆输送的损耗要比传统交流电的损耗小得多，因此采用交流电远距离传送电力很不划算。
Some people, however, question that standard because over long distances high-voltage DC lines suffer lower losses than AC.
现在有人开始质疑这一标准的适用性，因为在远距离输电的情况下，采用高压直流(HVDC)要比高压交流损耗小。
As the transmission length reaches a certain distance, DC transmission becomes economically attractive over ac.
当输电距离足够长时，直流输电的经济性将优于交流输电。
Both theoretical analysis and experimental results show that the AC DC converter has high efficiency over a wide range of input voltage.
理论分析和实验结果表明，该转换器可以在较宽的输入电压范围内获得较高的转换效率。
The proportion of power lost as heat into the atmosphere will also decline as DC links have smaller losses than AC over long distances.
作为热量传到大气中的电力损失比例也将下降，因为直流传输线在长距离传输中比交流传输线损失更少。
AC drive technology since it appeared in the world has showed advantage over DC drive technology.
交流传动技术从其诞生之日起就显示出直流传动无法比拟的优越性。
The utility model relates to a change-over switch of AC-DC electric welder.
本实用新型涉及一种交直流两用电焊机的转换开关。
Some people, however, question that standard because over long distances high - voltage DC lines suffer lower losses than AC.
但是一些人却在质疑这个标准，因为从远距离传输来看，高压直流电缆损失的电量比交流电缆少。
Some people, however, question that standard because over long distances high - voltage DC lines suffer lower losses than AC.
但是一些人却在质疑这个标准，因为从远距离传输来看，高压直流电缆损失的电量比交流电缆少。
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