Analysis of current and voltage unbalance in stator windings of asynchronous motors of the auxiliary machine drive

Effect of asymmetry of supply voltages on asynchronous motor operation modes was investigated using the computer-aided simulation experiments, the software complex Matlab and the package program Simulink. Publication relevance is determined by the necessity for performance of comparative analysis of the level of effect of asymmetry of supply voltages on asynchronous motors of different series and power capacities. Six motors of three different power capacities (5.5, 55, 160 kW) and of two different series (4A, AI) were modeled for investigation. The value of asymmetry of supply voltages was changed from 0 to 5%. The motor shaft load was changed from 0 to 120% of the motor rated load. Comparison of dependencies of the phase currents on the voltage unbalance ratio by reverse sequence (K2U) of asynchronous motors with short-circuited rotor series 4A and AI was made. The analysis and discussion of obtained investigation results were performed, recommendations on operation of asynchronous motors series 4A and AI in conditions of asymmetry of supply voltages were given.

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Analysis of Sidebands Failures in Asynchronous Drives

Strategic Applications of Measurement Technologies and Instrumentation - Advances in Chemical and Materials Engineering ◽

10.4018/978-1-5225-5406-6.ch004 ◽

2019 ◽

pp. 62-76

Author(s):

K. Vinoth Kumar ◽

Prawin Angel Michael

Keyword(s):

Induction Motors ◽

Abnormal Behavior ◽

Voltage Unbalance ◽

Stator Windings ◽

Stator Current ◽

Three Phase ◽

Motor Current Signature Analysis ◽

Im Model ◽

Harmonic Components ◽

Current Signature

This chapter deals with the diagnosis of induction motors (IM) with the so-called motor current signature analysis (MCSA). The MCSA is one of the most efficient techniques for the detection and the localization of electrical and mechanical failures, in which faults become apparent by harmonic components around the supply frequency. This chapter presents a summary of the most frequent faults and its consequences on the stator current spectrum of an IM. A three-phase IM model was used for simulation taking into account in one hand the normal healthy operation and in the other hand the broken rotor bars, the shorted turns in the stator windings, the voltage unbalance between phases of supply, and the abnormal behavior of load. The MCSA is used by many authors in literature for faults detection of IM. The major contribution of this work is to prove the efficiency of this diagnosis methodology to detect different faults simultaneously, in normal and abnormal functional conditions. The results illustrate good agreement between both simulated and experimental results.

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The effect of fast changes in voltage unbalance on vibration characteristics of asynchronous motors

Russian Electrical Engineering ◽

10.3103/s1068371214060108 ◽

2014 ◽

Vol 85 (6) ◽

pp. 382-388 ◽

Cited By ~ 2

Author(s):

M. A. Silaev ◽

V. N. Tul’skii ◽

I. I. Kartashev

Keyword(s):

Vibration Characteristics ◽

Voltage Unbalance ◽

Asynchronous Motors

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Spectrum Analysis of Sidebands in Industrial Drives

International Journal on Measurement Technologies and Instrumentation Engineering ◽

10.4018/ijmtie.2015070101 ◽

2015 ◽

Vol 5 (2) ◽

pp. 1-13

Author(s):

K. Vinoth Kumar ◽

S. Suresh Kumar ◽

A. Immanuel Selvakumar

Keyword(s):

Abnormal Behavior ◽

Voltage Unbalance ◽

Broken Rotor Bars ◽

Stator Windings ◽

Stator Current ◽

Three Phase ◽

Motor Current Signature Analysis ◽

Harmonic Components ◽

Current Signature ◽

Good Agreement

This paper deals with the diagnosis of induction motors (IM) with the so-called motor current signature analysis (MCSA). The MCSA is one of the most efficient techniques for the detection and the localization of electrical and mechanical failures, in which faults become apparent by harmonic components around the supply frequency. This paper presents a summary of the most frequent faults and its consequences on the stator current spectrum of an IM. A three-phase IM model was used for simulation taking into account in one hand the normal healthy operation and in the other hand the broken rotor bars, the shorted turns in the stator windings, the voltage unbalance between phases of supply and the abnormal behavior of load. The MCSA is used by many authors in literature for faults detection of IM. The major contribution of this work is to prove the efficiency of this diagnosis methodology to detect different faults simultaneously, in normal and abnormal functional conditions. The results illustrate good agreement between both simulated and experimental results.

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An investigation of the dynamic electromechanical coupling effects in machine drive systems driven by asynchronous motors

Mechanical Systems and Signal Processing ◽

10.1016/j.ymssp.2014.04.004 ◽

2014 ◽

Vol 49 (1-2) ◽

pp. 118-134 ◽

Cited By ~ 27

Author(s):

Tomasz Szolc ◽

Robert Konowrocki ◽

Maciej Michajłow ◽

Agnieszka Pręgowska

Keyword(s):

Electromechanical Coupling ◽

Coupling Effects ◽

Machine Drive ◽

Asynchronous Motors ◽

Drive Systems

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Exploration of Composite Solar and Wind Power Generation Device Control

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.724-725.52 ◽

2013 ◽

Vol 724-725 ◽

pp. 52-56

Author(s):

Lian Zhong Zhang

Keyword(s):

Power Generation ◽

Control System ◽

Wind Turbine ◽

Wind Power ◽

Wind Power Generation ◽

Voltage Unbalance ◽

Stator Windings ◽

Stator Current ◽

Fault Ride Through ◽

Power Generation Device

Recently, Solar energy and wind energy composite wind turbine by a number of studies have been carried out to examine the fault-ride through capability of the DFIG system during network disturbance. Whereas for all the work reported, the network voltage was assumed to be symmetrical. However, in practice, asymmetric faults occur more frequently than symmetric ones. For a DFIG system, if the voltage unbalance is not considered in the control system, the stator current could be highly unbalanced even with a small unbalanced stator voltage. The unbalanced currents create unequal heating among stator windings and torque pulsation in the generator. A wind-turbine driven DFIG without unbalancing voltage control considered might have to be disconnected from the network during network voltage unbalance.

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Criteria for Detecting Turn-To-Turn Short Circuit in Stator Windings Using Vector Analysis of Electric Motor Phase Currents

ENERGETIKA Proceedings of CIS higher education institutions and power engineering associations ◽

10.21122/1029-7448-2021-64-3-202-218 ◽

2021 ◽

Vol 64 (3) ◽

pp. 202-218

Author(s):

I. V. Zhezhelenko ◽

V. E. Kryvonosov ◽

S. V. Vasilenko

Keyword(s):

Short Circuit ◽

Sensitivity Coefficient ◽

Initial Moment ◽

Variable Load ◽

Two Phase ◽

Emergency Situations ◽

Stator Windings ◽

Industrial Enterprises ◽

Asynchronous Motors ◽

Phase Angles

At industrial enterprises, seaports, ships, more than 80 % of all electrical engineering equipment is asynchronous motors. In a number of cases, asynchronous motors operate with a sharply variable load, in an aggressive environment; herewith they receive power from the network with deviations of the power quality indicators from the normative ones, which causes their high damageability. Turn circuits in the stator windings account for about 40 % of cases of damage to the insulation of the asynchronous motors windings. Untimely detection of the initial moment of the appearance of defects in the asynchronous motors or disruption of the operating modes of the supply network and current circuits result in emergency situations of the electrical complex, equipment downtime and damage. The article discusses the issues of diagnostics of non-full-phase modes of current circuits, mains voltages and turn circuits in the stator windings of the asynchronous motors that receiving power from the networks in conditions of voltage asymmetry. The analysis of the vector diagrams of currents, voltages and additional phase angles of the phase currents displacement arising from the asymmetry of the mains voltages and turn circuits in the stator windings has been fulfilled. The results obtained made it possible to formulate criteria for identifying the initial moment of the turn circuit and two-phase modes, both in the network and in current circuits, in stationary modes. A method for non-destructive testing of the asynchronous motors state as well as a device for its implementation has been developed. The method is based on comparing the vectors of the measured phase currents of the asynchronous motors with their calculated values. The article presents the results of modeling the change in the vectors of phase currents from the number of closed turns in the winding of the asynchronous motors. The power series of asynchronous motors was established, for which the sensitivity of detecting the initial moment of the turn-to-turn short circuit is maximum. Analytical results of the dependence of the sensitivity coefficient for turn-to-turn short circuit on the absolute increment of the modules of phase currents and the corresponding phase angles have been obtained.

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