Another important issue, and our system is simply a power failure happens up in power distribution system. That power users have been affected very seriously. Especially if it happens, the power failure permanent, such as the broken pole to overthrow a accident or disaster, or to become operational was electric during the night, which has a strong visual NTPs group operations. It takes a long time to resolve than daytime, where these result in index value, reliability, high up in the distribution systems.
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