scope:

Purpose and scope of the guideline

This section, entitled "Dynamic behaviour of speed and load control", Part 4 of VDI/VDE 3521 "Guidelines for testing control systems of steam turbines", contains a list of recommendations for agreements and testing methods as well as explanations and term definitions, as they are required for testing and evaluating the control dynamic behaviour of steam turbines under primary control.

The information in this Section, Part 4, principally relates to power station steam turbines for which the speed or load is the definitive controlled variable. It can be extended in part and by analogy to single pressure controlled turbines.

Part 1 of VDI/VDE 3521 makes several references to this Part 4 of the guideline. The information it contains on carrying out static control experiments is already based on a general agreement on the type, scope and purpose of testing. In contrast, because of the diverse and complex dynamic interactions between turbo-generator and network and the resulting different requirements of the controller, only general information and testing methods for determining the system behaviour can be indicated in this Part 4, which may form an essential part of agreements between the parties. The static and dynamic properties of the controller itself can initially be determined according to Part 1 of this guideline.

If testing is to be carried out based on this part of the guideline, then it should be made an integral part of the delivery specification. The demands made on the turbine control properties and on their verification should then be included in the agreed scope of performance when drawing up the specification - taking into consideration the future network integration of the turbine and the testing of relevant operational aspects.