scope:

Scope and Field of Application

The package of Guidelines VDI/VDE 3501 to 3506 contain Instructions on the proper design of control circuits for steam generators in conventional power stations. Each of them are independent Guidelines, the Contents of which are nonetheless largely coordinated. A description of the control system is followed by the formulation of the control task; this is followed by a section containing descriptions of suitable configurations for the control circuits, with a further section devoted to an examination of the measuring equipment and actuators necessary for realisation of the control unit. The adjacent Guidelines 3500, 3507 and 3508 refer to the complete power Station. Although the fmdings and experiences contained in the Guidelines are widely known and recognised, they have not previously been assembled in this fashion.

The terms and notations used correspond to the defmitions and symbols of Standards DIN 19226-2 "Symbols and distinguishing signs for process Instrumentation and control", DIN 2481 "Thermal power plants" and ISO 3511/3 "Process measurement control funcntions and Instrumentation - Symbolic representation". The scope of application of this Guideline Covers drum level control in power stations with natural and forced circulation steam generators, in which the Separation of the saturated steam from the circulating water takes place in the drum.