Optimization of the norms of overhaul runs for traction electric motors of locomotives based on the results of the distribution of failures at the range of the Far Eastern Railway

2021 ◽  
Vol 18 (3) ◽  
pp. 393-401
Author(s):  
Denis Yu. DROGOLOV ◽  
◽  
Pavel V. SOKOLOV ◽  
Alexey S. KUSHNIRUK ◽  
◽  
...  
Keyword(s):  
Practical Importance ◽  
Poor Quality ◽  
Technical Condition ◽  
Insulation Resistance ◽  
Electric Motors ◽  
Preventive Control ◽  
Effect Analysis ◽  
Modal Interval ◽  
Traction Motors ◽  
Far Eastern

Objective: Optimization of the rates of overhaul runs on the basis of the results of the study of the distribution of failures of traction motors caused by a critical decrease in the insulation resistance of the windings to reduce the cost of eliminating the consequences of unscheduled repairs of locomotives. Methods: Mathematical statistics, probability theory, theory of reliability of technical systems are applied. Results: A cause-and-effect analysis was carried out of cases when locomotives were placed for unscheduled repairs in 2019–2020. An element has been determined that limits the rates of overhaul mileage of traction electric motors of locomotives. The theoretical distribution of failures of traction electric motors due to a critical decrease in the insulation resistance of its windings is obtained. The optimization of the norms of overhaul runs of locomotives was carried out according to the conditions of current repairs in the amount of TR-2 relative to traction electric motors. It was revealed that the failures are mainly associated with the first period of operation of traction motors. As a result of the analysis of the reasons for the failure of traction electric motors, it was found that most cases of unscheduled repairs fall on the first interval of locomotive runs due to the poor quality of repairs. In this case, the first normal peak of failures falls on the mileage in the modal interval from 156 to 234 thousand kilometers, when the overhaul mileage on TP-2 is 250 thousand kilometers, which necessitates its optimization within the preceding modal interval. Practical importance: The presented version of optimization of overhaul runs can be used to determine the rationality of establishing the norms for the periods of maintenance and repair operations on locomotive units under the conditions of a planned preventive control system for their technical condition

scholarly journals Results of performance tests of an experimental class H insulation system for locomotive traction motors and its monitoring using the mobile diagnostics means

2021 ◽  
Vol 2021 (4) ◽  
pp. 35-46
Author(s):  
Denis I. PROKHOR ◽  
Keyword(s):  
Electric Motor ◽  
Practical Importance ◽  
Performance Tests ◽  
Electric Motors ◽  
Diesel Locomotive ◽  
Insulation System ◽  
Traction Motors ◽  
Definition Of ◽  
Traction Electric Motor ◽  
Motor Failure

Objective: To perform traction electric motor performance tests with an experimental class H heat resistance insulation system. Methods: An experimental set of traction electric motors was manufactured at the Voronezh Diesel Locomotive Repair Plant to be compared with a motor of class F insulation. Results: The performance indicators of controlled locomotives have been summarized. Explanations and definition of additional insulation parameters and an example of their use in case of traction electric motor failure due to damage to controlled locomotives have been given. Practical importance: The proposed methodology for predictive diagnostics of traction electric motors performance can be used in service locomotive depots.

Assessment of the technical condition of underground structures of the largest hydroelectric power station in the North Caucasus, the Chirkeyskaya HPP

2021 ◽  
Vol 18 (3) ◽  
pp. 410-420
Author(s):  
Vladimir N. KAVKAZKY ◽  
◽  
Yana V. MEL’NIK ◽  
Alexey P. LEIKIN ◽  
Andrey V. BENIN ◽  
...  
Keyword(s):  
Large Scale ◽  
Practical Importance ◽  
Hydroelectric Power Plant ◽  
Technical Condition ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Underground Structures ◽  
North Caucasus ◽  
The Caucasus ◽  
The North

Objective: Chirkeyskaya HPP is by far the most powerful hydroelectric power plant in the North Caucasus with the highest arched dam in Russia and the second highest dam in the country after the Sayano-Shushenskaya HPP. This explains why it is called the pearl of the Caucasus. Methods: For the operation and maintenance of this unique structure, a large-scale complex of underground structures for various purposes was built, the technical condition of which must be constantly monitored. To carry out work on the survey of underground structures, the management of the design and survey institute of JSC “Lengidroproekt” decided to attract specialists from the Department of Tunnels and Subways and the Test Center “Strength” of Emperor Alexander I Petersburg State Transport University. The work was successfully carried out at the end of 2015. Results: The safety of underground structures was objectively assessed. Recommendations for the repair and further comprehensive reconstruction of the Chirkeyskaya HPP have been developed. Practical importance: Carry out work on the survey of underground structures of Chirkeyskaya HPP is allowes elaborate of complex measures on safety from Chirkeyskaya HPP.

An Approach to the Use of an External Magnetic Field As a Diagnostic Sign of an Asynchronous Motor Malfunction

2021 ◽  
Vol 64 (3) ◽  
pp. 18-23
Author(s):  
Ildar Yamansarin ◽  
◽  
Mikhail Salikov ◽  
Alexander Padeev ◽  
Dmitry Surkov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Short Circuit ◽  
Asynchronous Motor ◽  
Technical Condition ◽  
Stator Winding ◽  
Electric Motors ◽  
Transform Method ◽  
Fast Fourier Transform Method ◽  
Measurement Location

The article deals with the issues related to the possibility of diagnosing the technical condition of an asyn-chronous electric motor by an external magnetic field. The justification of the problems associated with the di-agnosis of electric motors is given. The difficulties that arise when measuring the external magnetic field of electric motors, as well as the devices with which it is possible to carry out measurements, are described. The re-lationship between the EMF of the sensor and the external magnetic field is shown. The results of processing the EMF waveforms induced by an external magnetic field in an inductive sensor for various electric motors are presented. The processing was carried out by the fast Fourier transform method. The external magnetic field contains the first harmonic and various harmonics that are multiples of the combination of the stator teeth, or the sum of the stator and rotor teeth that fall on one pair of poles. The ratio of the amplitudes of the first and tooth harmonics is affected by the measurement location and the orientation of the sensor. Diagrams showing the ratio of the main and tooth harmonics at different points of the motor body are constructed. The depend-ences of the harmonic amplitudes on the magnitude of the magnetizing current of the stator are given. Changes in the amplitudes and spectrum of harmonics in the presence and absence of an inter-turn short circuit in the stator winding are shown. Diagrams of the circular external magnetic field for the main and higher harmonics are constructed. The study shows the possibility of using an external magnetic field to detect inter-turn short circuits of the stator winding.

Examination of State of the Cable Insulation by the Return Voltage

2018 ◽  
Vol 19 (6) ◽  
Author(s):  
Dmitry Semenov ◽  
Anna Sidorova ◽  
Pavel Romanov ◽  
Aleksey Kuvshinov
Keyword(s):  
Residual Life ◽  
Technical Condition ◽  
Actual State ◽  
Power Cables ◽  
Insulation Resistance ◽  
Cable Lines ◽  
P Factor ◽  
Paper Insulation ◽  
New System

Abstract The relevance of the study is conditioned by the need to determine the state and residual life duration of high-voltage cable lines to identify faulty and maintainable cables. The aim of the article is to determine a reliable scientifically grounded criterion for assessment of insulation characteristics of the cables in use and to perform a comparative analysis of the results obtained by the traditional method of diagnosing insulation with the results of a new method of assessment by the return voltage. In this regard, the article deals with the issues related to the testing of cables having oil-impregnated paper insulation, as well as with the issue of switching from planned replacement of cables to assessment of their actual state and period of residual life. The authors propose to use the method of examining the cables by the return voltage using the device for testing electrical insulation “UDEI-1” developed at the department of Electrification and Automation of the Nizhny Novgorod State University of Engineering and Economics. The article presents the results of measuring the return voltage of three cables that operated under different conditions. The cables had different technical state. The analysis of the estimation of the residual life of cables by the return voltage was carried out using such criteria as the PIRV polarization index, the LIRV electrical conductivity index, and the P-factor. The P-factor is the physical criterion demonstrating the aging of paper-oil insulation by the shape of the return voltage curve. It represents such characteristics of insulation aging as moistening. To compare the results of testing the cables by the return voltage with the conventional methods of diagnostics and to determine the actual technical condition of power cables, the authors applied the method of spatiotemporal reflectometry and the method of measuring insulation resistance with the determination of such indicators of state as insulation resistance normalized per one kilometer, absorption coefficient, and polarization index. The results of this article confirm that the return voltage gives a qualitative assessment of the state and degree of aging of cables with impregnated paper insulation. The authors proposed a new system for evaluation of cable condition by weighting coefficients. In this approach, the determination of residual life of cables with impregnated paper insulation is based on the values of the return voltage. Application of the new system gives opportunity to improve reliability of the power lines. Recommendations for the further operation of the studied cables are given. The materials of the article are of practical value for carrying out complex assessment of the technical condition of power cables by the return voltage and can be useful for drawing up a schedule for replacement or repair of cable lines depending on their actual state.

Monitoring the technical condition of the railway track using the method of continuous recording of dynamic processes occurring due to the interaction between rolling stock and railway track

2021 ◽  
pp. 66-82
Author(s):  
Yuriy P. BORONENKO ◽  
◽  
Aleksandr V. TRET’YAKOV ◽  
Rustam V. RAKHIMOV ◽  
Mariya V. ZIMAKOVA ◽  
...  
Keyword(s):  
Practical Importance ◽  
Stability Margin ◽  
Technical Condition ◽  
Continuous Recording ◽  
Railway Track ◽  
Lateral Interaction ◽  
Rolling Stock ◽  
Monitoring Method ◽  
Wheel Pair ◽  
Interaction Forces

Objective: To develop the method to monitor the technical condition of the railway track. Me-thods: A strain-gauge wheel pair is used for continuous recording of vertical and lateral interaction forces in a dynamic wheel–rail system. Results: Stability margin factors of a wagon relative to de-railment have been determined and the defective (prone to derailment) sections of a railway track have been identified with the exact identification of their location (GPS coordinates) on the map using navigation devices. Practical importance: The developed monitoring method makes it possi-ble to promptly re¬gister and eliminate railway track defects

Predictive analytics of the technical condition of diesel locomotive systems using neural network predictive models

2021 ◽  
pp. 102-114
Author(s):  
Mikhail V. FEDOTOV ◽  
◽  
Vladimir V. GRACHEV ◽  
Keyword(s):  
Neural Network ◽  
Predictive Model ◽  
Predictive Models ◽  
Short Term Memory ◽  
Predictive Analytics ◽  
Practical Importance ◽  
Technical Condition ◽  
Feedforward Neural Network ◽  
Diesel Locomotive ◽  
Short Term

Objective: Study of the possibility of carrying out predictive analysis of the technical condition of locomotive equipment using neural network predictive models enabling to plan the scope of equipment maintenance for routine types of maintenance and repair. Methods: A comparative assessment of the accuracy of forecasts made using a feedforward neural network and a recurrent network with an LSTM layer (Long Short-Term Memory) has been carried out. For training and test-ing of predictive models, we used the results of monitoring the parameters of the lubrication sys-tem of the 2TE116 (2ТЭ116) diesel locomotive by means of on-board diagnostics. Results: The aver-age interval for preventive inspections (TO-3) of locomotives in the existing locomotive mainte-nance system is 25–30 days, and therefore it is this interval that determines the minimum duration of the lead-in period, which the predictive model should provide. We have established that a mod-el based on a feedforward neural network provides sufficient accuracy only for short-term fore-casts with a lead period of no more than 1–3 days. With a further increase in the lead-in period, the error of the model res¬ponse increases to 10–15 %, which prevents it from being effectively used for solving practical problems associated with planning the operation of service locomotive depots. At the same time, the ave¬rage response error of the predictive model based on a recurrent net-work with an LSTM layer does not exceed 3,5–5 % over a 30-day lead-in period, so it can be used to plan the scope and timing of locomotive maintenance procedures. Practical importance: The possi-bility of using time-series analysis methods for predictive analytics of the technical condition of units and systems of a locomotive is shown. Predictive models based on recurrent neural networks with LSTM layers provide prediction accuracy and lead-in period sufficient for solving practical prob-lems that are associated with planning the scope and timing of locomotive maintenance.

scholarly journals Justification of the active method of protecting the insulation of submersible electric motors

2019 ◽  
Vol 124 ◽  
pp. 02003
Author(s):  
V. A. Trushkin ◽  
O. N. Churlyaeva ◽  
R. V. Kozichev
Keyword(s):  
Physical Properties ◽  
Electrical Breakdown ◽  
Electrical Equipment ◽  
Working Environment ◽  
Operating Parameters ◽  
Insulation Resistance ◽  
Electric Motors ◽  
Electrically Conductive ◽  
Active Method ◽  
Conductive Properties

The article provides an analysis of the properties of the working environment of submersible electrical equipment. The influence of the operating parameters of electrical equipment on the physical properties of the fluid (its electrically conductive properties) is considered. Mathematical confirmation of the implementation of electroosmosis in the capillaries of the insulation of submersible electric motors is given. The rationale for the active method of protecting submersible electrical equipment from reducing insulation resistance and preventing electrical breakdown is given.

scholarly journals IMPROVING METHODS OF MONITORING THE THERMAL STATE ELECTRIC LOCOMOTIVES TRACTION ELECTRIC MOTORS

2015 ◽  
Vol 2 (158) ◽  
Author(s):  
Denys Zhalkin ◽  
Artem Taran
Keyword(s):  
Thermal State ◽  
Thermal Control ◽  
Technical Condition ◽  
Temperature Fields ◽  
Remaining Life ◽  
Transportation Energy ◽  
Traction Motors ◽  
Mathematical Processing ◽  
Winding Insulation

Completion of the review of methods and tools for monitoring the technical condition of tractionelectric motors (TM) has shown that existing technologies do not provide fully reliable results. Should beconsidered the most promising thermal control, has been widely used in transportation, energy, construction,medicine.Purpose of the article - the development of thermal control and predict the remaining life of thewinding insulation of motors based on the systematic thermal overload, which gives an opportunity toincrease the efficiency of the locomotives as a whole and to reduce the breakdown of the number of motors.Most frequently the traction motors to be repaired due to damage to the insulation (30 %), its lowresistance (5 %), the occurrence of the fire by the circular collector (15 %), damage the anchor bearing(15 %).The technology assessment of the technical condition of the anchors TM with thermal control methodcomprising:- Of the operations of preparation and testing of TM by mutual load after repair;- Operative measurement of temperature fields on the outer surface of the armature using a portabletemperature recorder;- Mathematical processing of thermography;- Issue a report on the quality of repair of motor armature.Thermal control system and predict the remaining life of the winding insulation TM allows you to limitthe amount of thermal overloads, and thus reduce the number of failures of electric locomotives and stops.

Sign in / Sign up

Export Citation Format

Share Document