The conception of system protection is introduced, the realizing scheme of main protection and back-up protection is deeply discussed. The sample has been finished.
介绍了系统保护的概念，深入探讨了系统保护主保护和后备保护的实现方案，并完成样机。
Power system protection work, when power lines were damaged or for other reasons the system back-up power supply is still able to work more than 24 hours, calls will be automatically recharged after.
系统有断电工作保护功能，当电源线路被破坏或由于其他原因断电时系统备用电源仍能继续工作24小时以上，来电后将会自动充电。
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