2. power transmission systems operate in warning when exists in one of the following conditions:a backup frequency thing, Level) backup, backup quick start is lower than the level specified in normal operating mode the unit by operating the power system and power market construction and electricity regulatory agency approval;b) the level of the load bearing lines and substations in transmission grid on 90% but does not exceed the limit value;c) possibility of natural disasters or abnormal weather conditions can influence the electrical system security;d) possibility of security issues, Defense could threaten the security of the electricity system.
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