Том 52, № 5 (2019)

Experience gained from studies of the transient processes that accompany torsional vibrations, including an analytic solution of the problem along with results of calculations of transient processes, is generalized. Features in the relationship between the driving torque of the turbine and the elastic moment on the shaft of the generating unit as a function of the point of application of jump in the load on the set are presented.

This paper gives basic information on conducting experimental works to substantiate the design solutions for leveling the Zagorsk PSP-2 powerhouse. The compensation grouting technology for leveling the Zagorsk PSP-2 powerhouse is substantiated.

The increased vibration of the stators in TGV series turbogenerators with tangential elastic core suspension is examined. The existing repair options for vibration reduction are reviewed briefly. Results are presented from a theoretical study of the dependence of the dynamic properties of turbogenerator stators on the rigidity with which the core is fastened to the intermediate frame and the rigidity with which the housing is fastened to the foundation. Based on these results, an improved technology is proposed for reducing the stator core vibration. This technology is applied to a type TGV-300 turbogenerator with an unsatisfactory vibrational state of the stator. An analysis of vibration monitor data prior to the repairs and for the subsequent two years of operation showed that these actions made it possible to reduce and stabilize the vibration of the stator core and housing. The effectiveness of these measures depends substantially on their timely application.

A new method of calculating the turbine spiral pits of hydraulic turbines with round cross-sections is proposed. The method generalizes techniques that are used today for determining the circular cross-sectional areas of a spiral with assigned or adopted area of its input cross-section. Any laws of variation of the average circumferential velocities in the cross-sections along the length of the spiral may be adopted in the method, which substantially expands the range of methods currently employed. By means of the method the dimensions of round and elliptical cross-sections of a spiral in the tooth region with the widely used conical scheme of coupling of its metal shell with the stator of the hydraulic turbine may be precisely determined.

The use of the finite element method for numerical prediction of the results of using the controlled compensation grouting method which allows compensating settlements of buildings and structures by lifting them is examined. The method is based on using two grout compositions. The first composition is used for impregnating the soil around the sleeves to create a homogeneous isotropic shell and the second for compensating settlements.

The foreign experience of using once-through heat-recovery steam generators (HRSG) in CCPPs is presented. Russian developments of once-through HRSGs of various configurations based on modern gas turbines are considered. Design procedures for ensuring the reliability of the heating surfaces of high- and intermediate-pressure evaporators are developed. Technical requirements for the design of vertical and horizontal once-through HRSGs are formulated.

The mass introduction of new digital relay protection (RP) devices and the communications systems between them potentially makes it possible to increase the sensitivity of relay protection due to the introduction of multidimensional measurements. Amethod is proposed for effective combination of the measurements of a set of individual fault detectors, increasing the recognizability of RP modes. The method is based on the statistical theory of detection, the Bayesian criterion of minimizing the mean risk of decision-making.

Water flow in a hydraulic flume is studied with a broad-crested spillway model. The research was conducted using the methods of computational hydrodynamics (CFD), as well as experimentally. Correspondence of calculated, experimental, and handbook data was obtained, and the shortcomings of the proposed CFD model were noted.

The affiliation of the fifth author, K. K. Semenov, is incorrect. The affiliation should read

Peter the Great St. Petersburg Polytechnic University (SPbPU), St. Petersburg, Russia.