Method for realizing graded starting of security load

Abstract

The invention discloses a method for realizing graded starting of security loads, which comprises the following steps of: 1) collecting information of the security loads of a unit, and carrying out graded starting delay setting on the security loads of the unit; 2) judging the power-off logic of the security bus, and entering step 3) when the judgment result is that the bus is power-off; 3) when the power-off time of the security section bus is greater than T1, stopping all security loads, and then entering the step 4); (4) judging the starting success logic of the diesel generating set, and if the judgment result is yes, entering the step (5); (5) judging that the bus voltage of the security section recovers normal logic, and if the judgment result is yes, entering the step (6); 6) judging whether the power-off time of the security bus is greater than or equal to T2, and when the power-off time of the security bus is less than T2, performing graded starting on the unit security load according to the set graded starting delay; and when the power loss time of the security bus is greater than or equal to T2, the unit security load is not started any more, and the method can ensure safe shutdown of the boiler.

Description

technical field [0001] The invention belongs to the technical field of power plant security power supply, and relates to a method for realizing grading start of security load. Background technique [0002] In the event of a power outage of the whole plant or power loss of the unit plant, the power supply of the security section is switched to the security power supply of the diesel generator set. The power supply object of the security section is the accident security load, which is to ensure that the furnace can be safely shut down when the whole plant loses power or the unit loses power. The accident safety load needs to be restarted quickly after the safety power supply is restored. [0003] Defects and deficiencies of the prior art: [0004] In practical applications, due to the different configurations and protections of various security load switch cabinets, the self-starting program of the switch configuration and the logic coordination of DCS (Distributed Control S...

AI Technical Summary

Problems solved by technology

[0004] In practical applications, due to the different configurations and protections of each security load switch cabinet, the self-starting program of the switch configuration and the DCS (Distributed Control System) / TCS (Turbine Control System) logic cooperation and other reasons often cause problems. Various failures lead to self-starting failure, such as diesel engine starting failure, safety load not starting or not starting in accordance with the designed sequence, and diesel generator set suddenly being overloaded and failing to start, which brings great hidden dangers to the power plant. Guarantee the safe shutdown of the furnace

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