Methodological aspects of assessment and forecast of technical condion of the main installed equipment of power plants

The methodology is presented for assessment of the technical condition of an object, which is a separate unit of power equipment from a group of the same type of equipment of power plants. It is demonstrated that technical condition is a characteristic of quality of an object under investigation, which, for practical purposes, should be calculated as a deviation from an established value. The assessment of technical condition is fulfilled with uniform criteria based on a limited amount of initial data on each of the basic properties of the object. The assessment can be fulfilled at the level of the object performance indicator, at the level of the object individual property and at the level of a set of the object properties. The top level assessment is a function of the loss of quality by the object, which is calculated through convolution of low level values. The assessment of technical condition of an object is accompanied by calculation of uncertainty of quality loss functions by means of transformation of uncertainties of initial data into uncertainties of output values. The evaluation of the technical condition can be expressed either in relative units - the percentage of quality loss relative to the maximum possible quality of the object, or in absolute units - the monetary equivalent of a loss of quality by the object. Evaluation in relative units enables to determine the residual gamma resource of the object, but this requires the participation of an expert to assign the weight of performance indicators. Evaluation in absolute units makes it possible to identify objects whose improvement in technical condition is appropriate from the economic point of view. To track the reasons for deviations in the technical condition from the set values, a structured list of performance indicators and factors affecting them is used. It is shown that the possibilities of evaluating the technical condition in relative units are limited: an attempt to perform assessment and analysis of the technical condition by convolving values of indicators and characteristics of properties into a single numerical index gives incorrect results. Neglect of these restrictions leads to emergence of inadequate, unsubstantiated scientifically methodological requirements for assessment of the technical condition of power equipment.

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