Vol 50, No 6 (2017)

Considered are the results of visual supervision and vibration measurements performed during testing of the stepped spillway of the Boguchany hydrosystem with discharges up to 1200 m³/sec and unit discharges up to 17 m²/sec.

Some aspects of determining the temperature field of the Sayano-Shushenskaya dam are considered. The results of a finite-element analysis of the thermal components of the radial displacements of the dam crest over the period from 1989 to 2015 are presented. A classification of thermal states of the dam is proposed. Headwater level limits at intermediate stages of reservoir filling are found to ensure the integrity of grouted zones in the upstream face and base of the dam. Criteria for choosing an operating rule curve for the reservoir depending on the thermal state of the dam are proposed

Despite their relative simplicity, sloping permeable installations have a multilayer structure. The interactions of waves with these slopes are quite complicated, so special attention should be paid to the combined use of analytical methods and laboratory experiments when designing these structures.

Field observations of rock-earth dams lead to a recommendation that problems of filtration through the clay core of a dam should be solved using principles of unsteady flow (the Poisson equation). In many ways, the resulting solution changes the concept of filtration flow through the core. Settling during the construction period is compensated by adding additional soil.

Hydraulic studies carried out on high-tech equipment have shown that the depth of the flow at the crest of the Crump weir is equal to the critical level and that the real discharge of the weir is 4% higher than the level calculated by the State Standard of the Russian Federation. A formula for calculating the discharge with error less than 2% is presented.

The need for a thermal part of an automatic frequency divider in power plants with cross links is explained and ways of making these systems cheaper are proposed.

The experience of using FUT, FUT-B83, and UPFS carbon plastics in plain bearings of power pumps, crude booster pumps, scavenge pumps, reservoir pressure maintenance pumps, and feed pumps of power plants is generalized. The results of laboratory and bench tests are presented. There are more than 1000 pumps with bearings made of FUT and FUT-B83 plastics.

Presented are formulas for determining the relative mass (damper/bearing mass ratio) and geometrical parameters of the damper, taking into account the dimensions of the space for mounting the damper on the turbogenerator bearing.

Amathematical algorithm for calculating the real-time temperature of the conductors in three-phase high-voltage cable lines using data on the distributed temperature in screens and the current load in the conductors was developed. It was proposed that the heating of the cable conductors be calculated using equivalent thermal circuits constructed on the basis of the Van Wormer method.

A method that uses groups of test expressions to validate critical electricity measurements is considered. Calculated results are compared with electricity measurements for a portion of the Russia power system.

Results are presented from comprehensive tests of a sample low-emission combustion chamber for a GTU-110M gas turbine at partial (350 kPa) and full (1500 kPa) pressures. Data on the emission characteristics are shown that confirm low emissions of nitrogen oxides and high fuel burnup during operation of the combustion chamber with 50 to 100% load on the gas turbine. The effect of the pressure in the low-emission combustion chamber on the emission characteristics and combustion stability is analyzed. Away of controlling the combustion chamber to obtain the required performance is demonstrated. A comparison and analysis of data obtained with partial and full air parameters confirms that they are identical with respect to the temperatures of the walls of the fire tube and gas collector, and with respect to the temperature distribution and temperature nonuniformities of the flue gases and to the completeness of fuel burnup. Models of the acoustic boundary conditions on a test stand with partial and full parameters are also confirmed.

The insulation level of DC control circuits is an important safety-critical factor and, thus, should be subject to continuous and periodic monitoring. The methods used for monitoring the insulation in live circuits may, however, disturb the reliable operation of control relays. The risks of misoperation and failure to reset of relays posed by the operation of various insulation monitoring and fault location systems are evaluated.