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3 General Principles
3.0.1 The design for fossil fuel power plants auxiliary power (hereinafter referred to as auxiliary power must carry through national technical economy policy and the plants development planning and construction condition in stages should be taken into consideration at the same time so as to achieve the requirements of safety and reliable, economy and conforming to state of the nation. The new technique and new facilities through operation trial and verification should be adopted cautiously in the design.
For units with 200MW or above, the auxiliary power independence of various units should be kept and the contact among various units should be reduced so as to improve safe reliability of the operation.
3.0.2 The design of the auxiliary power not only implemented the "Rule”, but also implemented the prescription of related specifications and standard of country and industry.
3.0.3 The auxiliary power consumption rate of the power plant design is the ratio of annual furnace electric power generation and heat supply required electric power consumption and corresponding units power generation and heating load respectively.
In the design, the auxiliary power consumption rate estimation method under rated conditions can refer to Appendix A (Informative Appendix).
3.0.4 The auxiliary power load can be divided into the following three classes according to the significance in the production process:
Class I load: the short-time (the required time for power supply restoration by manual switch) power off may be likely to influence person or facility security and make the manufacturing intermission or great reduction of power generation amount.
Class II load: the short-time power off is allowed, but the overlong power off time may be likely to spoil facility or influence regular production.
Class III load: long-time power off is unable to directly influence production.
3.0.5 During the units operation and the shutdown (including emergency shutdown), even period of time after shutdown, the load is in need of continuous power supply is called unceasing electrical load, it is called Class "OI" load.
3.0.6 When the power off happened in the plants or unit units missed auxiliary power, so as to guarantee the safety shutdown of the boiler and rapidly restart, or prevent from endangering personal safety, the load is in need of continuous power supply when it is power off, it is called emergency security load. According to different requirements of load to electric power supply, it can be divided into:
DC security load, it is called Class "OII" load.
AC security load, it is called Class "OIII" load.
3.0.7 The common auxiliary power load characteristics can refer to Appendix B (Informative Appendix).
3.0.8 The load independent of power plants manufacturing should not be accessed into auxiliary power system. The load of administration building, attendant dormitory and other workshop areas can be accessed into high-voltage auxiliary power system through special low-voltage auxiliary transformer. |
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