The over-load protection technology is an indispensable constituent of the low-voltage apparatus intellectualization, ensuring the electric motor and the distribution line safe operation.
过载保护技术是低压电器智能化技术的重要组成部分，是保证电动机、配电线路安全运行的重要技术。
The reason is that the transformer supply area is too broad and the low-voltage line is too long in present distribution model.
究其原因在于现有配电模式中配电变压器供电范围过大，低压线供电半径过长。
So it will be applicable to different kinds of low-voltage distribution networks and plays its role of reducing line depletion and improving the quality and stability of the power grid operation.
所以它将适用于各类中低压配电网络，起到降低线路损耗，提高电网运行质量和稳定性的作用。
Considering the practical engineering of Guangzhou Metro Line 3 and Line 4, the intelligent low voltage distribution system is briefly introduced.
结合广州地铁3、4号线工程实例，介绍智能低压系统的设计和应用。
The various selection methods of low voltage breaker when it was applied in distribution line, motor and lighting are introduced as well as the corresponding installation requirements.
介绍了低压断路器分别应用于配电线路、电动机和照明的选择方法，并就安装时应满足的具体要求作了阐述，提出了断路器在使用和维护过程中应注意的事。
The various selection methods of low voltage breaker when it was applied in distribution line, motor and lighting are introduced as well as the corresponding installation requirements.
介绍了低压断路器分别应用于配电线路、电动机和照明的选择方法，并就安装时应满足的具体要求作了阐述，提出了断路器在使用和维护过程中应注意的事。
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