A high stator winding temperature, which also depends on the insulation class, gradually and irreversibly reduces the electrical and mechanical performance The insulation in the windings ages over time due to the thermal, electrical and mechanical stresses plus environmental factors such as contamination. The stable operation of a generator mainly depends upon the stator winding insulation. A failure mode is defined as the final stage of a failure mechanism, after which the equipment can no longer perform its function. processes. This type of fault refers to "stator turn fault". Electrical Treeing in Solid Insulation, IEEE Electrical Failure Due to Vibration on Stator Windings This is a case where a ground fault occurred on the stator winding of an air cooled gas turbine generator manufactured with the global vacuum pressure impregnation (VPI) method. conductive materials such as surface contaminations or grading tapes The failure mechanism involves the gradual development of a weakness in the insulation. The proposed test sample cannot evaluate all of the practical aspects of the turn insulation. As the demands on insulation systems are increased, failure combinations of insulation materials can reduce the anti-tracking The tests show that design, and will review insulation failure mechanisms and problems. Bearing failure on motors can be an indication of the incorrect bearings for the . • If we analyse location wise stator failure, it is 68% on NDE side where as just 27% on DE side. testing to 4 kV motor and generator windings. Thermal deterioration of insulation in one phase of the stator winding can result from unequal voltage between phases. mechanisms. To assess the condition of turn insulation, a test sample has been proposed by IEC/TS 60034-18-42. The open is usually caused by a blown fuse, an open contactor, a broken power line or bad connections. The failure mechanism involves the gradual A single-phased winding failure is the result of an open in one phase of the power supply to the motor. 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Resistances for two of these materials were re-evaluated over a temperature range approximating that experienced by the material when in operation. © 2008-2021 ResearchGate GmbH. AAW provides the knowledge and expertise that will allow you to make the best decisions for your organization. The failure mode is is commonly used. Up to now we can see the damaged part of the stator winding as attached picture. Descriptions of the causes of failure are provided on the back cover. 146-151. Found inside â Page 432OF MUSH WOUND STATOR WINDINGS Important constructional features of stator windings. Measures that can be taken to prevent such failures. n In this chapter we learn n n The possibilities of high voltages appearing between adjacent turns ... Stator coil burning is one of the most common motor failures in the factory. It is made of thin metal sheets, called laminations, instead of being solid, to reduce energy losses. This 3, where: f st is the frequency peaks of interest; f is the supply frequency; n is an integer from 1, 2, 3, etc. Surveys have shown that rotor and stator winding failure account for about half of motor failures in motors rated 2300 V and above [1]. ten 4 kV motors over the past two years show that partial discharges may Conductive tapes are used as a conductive layer on the slot portion of a coil to reduce corona discharges that can occur on coil surfaces. The fault has made the generator stop to operate. Found inside â Page 260260 Chapter 9 action frequently considered is to electrically disconnect the failed coils , leaving the leads of the ... This , of course , will result in considerably more stator winding heating for the first motor , with the need to ... Found inside â Page 278The melting silicon steel sheets flow into the stator slot and burn the winding insulation [3]. 2) Winding main insulation failure These kinds of failures have two reasons. Firstly, it is insulation aging. Secondly, it is congenital ... Figure 3 whole stator iron bulk and the stator windings form a solid mass, removal of one coil and its replacement is impossible, unlike in the previous case. This paper is mainly concerned with stator windings rated greater than 6 kV, and rotors of various sized machines. It's very important to accurately identify problems that require a motor's removal and . The ECP layer consists of semi-conductive materials, which demonstrate non-linear field strength-dependent conductivity. surges in insulation technology. Note: Under-voltage and over-voltage (exceeding NEMA standards) will result in the same type of insulation deterioration. Figure 7 Bar abrasion due to loose windings in the slot of a turbo generator that did not have sufficient sidepacking or a radial follow-up wedging system. Stator insulation failures are normally the results of long-term thermal aging [6]. Found inside â Page 170Stator winding faults are one of the most common and comprise about 37% of all failures [1â3]. The stator winding damage begins with unnoticeable inter-turn short circuit, that eventually spreads over the whole winding, causing the main ... Found inside â Page 147Stator Winding Fault The fault occurs due to the insulation failure of the stator winding then it is called as stator winding fault or inter turn short circuit fault. Stator winding fault is classified into six types according to the ... A single-phased winding failure is the result of an open in one phase of the power supply to the motor. combinations of insulation materials can reduce the antitracking The failure mechanism involves the gradual development of a weakness in the insulation. motor failures are related to stator winding insulation failure [1-3]. The curves 100, 101, 102, and 103 represent the stator signal data for stator windings having different degrees of stator winding failure. AAW specializes in the electric motor and pumps repair services as well as performing on-site preventive and predictive maintenance of electric motors. Unequal voltages usually are caused by unbalanced loads on the power source, a poor connection at the motor terminal, or a high resistance contact (weak spring). Table 1: Stator Winding Failure Mechanisms [1] Stator winding / Coil (Motor) Burning Problem. Stator winding failures are generally attributed to groundwall or However, in this context, a complete stator windings insulation analysis have been carried out by testing and monitoring techniques such as insulation resistance, di-electric absorption ratio, polarization index before repair and after rehabilitation work, ac & dc high voltage, dc resistance test of winding coils, as well as surface potential test, no-load test and short circuit test. increasing corona or partial discharge activity. The single greatest obstacle to obtaining these data is related to getting the data from the rotating element. Found inside â Page 149stator. winding. inter-turn. fault. severity. indicator. Partha Mishra EE Department, College of Engineering and Management, ... A cross correlation technique based induction motor stator winding fault identification scheme has a ... Found inside â Page 446Common faults of the induction motor are stator winding failure, broken rotor bar, inverter failure, bearing failure, bearing misalignment and shaft cracking [6]. Here, stator winding failure, broken rotor bar and bearing failures are ... To accelerate degradation of insulation, induction motor in service condition was subjected by a lot of pressure simultaneously, including thermal, moisture, and salt contamination. High Thermal Stress: stator insulation failure and rotor-related faults. About 80% of electrical motor failures are a result of winding damage in the motor stator and bearing faults. Nowadays, automobile transportation is in a crisis due to the high price of gasoline and, in the future, the crises will worsen unprecedentedly. Maintenance experts agree that excessive heat causes rapid deterioration of motor winding insulation. IEEE Transactions on Industry Applications. to contaminated conditions of high voltage windings and to optimize the Reverse Power This occurs due to failure of the prime mover and insufficient torque supplied to the generator. Found inside â Page 576of the insulation temperature rating system for machine windings. As a result of this change in the ... 10.9.1 Failure Mechanisms The failure mechanisms of the machine are divided into stator winding, rotor winding, and exciter. paper looks at tracking as one failure mechanism and describes a series failure following the inward motion of the corona activity. from the outside inward. Introduction of multi-level stator winding failure in the 3D FEM model of the induction motor can shift the current amplitude (time-information) and frequency spectrum. As an example, if a motor that would normally … Reasons for Bearing Failure insulation deterioration mechanisms found in motors and generators rated Abstract: Stator winding failures are generally attributed to groundwall or turn insulation failures. winding failure following the inward motion of the corona activity. As the short-circuits can occur in different locations in the coil and can have different impact on the current or torque waveforms, the number of cases to be studied . Turn-to-turn short-circuit of stator winding due to deterioration of electrical insulation is one of the most probable faults in motor drive systems. The obtained test results demonstrated an acceptable agreement with the simulation results. Found inside â Page 75ABSTRACT: The inter-turn short-circuit faults of stator winding are the most common electrical faults of an asynchronous ... Motor stator winding failure will inevitably cause an air-gap magnetic field distortion, so that the motor ... INTRODUCTION In the past decade or so, the motor and generator business has truly become global. This paper presents a discussion of the effect of operating environment on the condition of conducting slot armour, and an overview of several types of commercially available materials. Strategically located in the Northern Virginia/Washington D.C. area, it has developed its expertise in serving the needs of the local governments, federal contractors, as well as private industry. Stator Winding Failure Electrical insulation deteriorates at a rate that doubles for every 10°C increase in temperature. By Maulik Dave. The The keys to minimizing the negative impact of a leak are early detection and timely repair. This research techniques will pave the way to overcome such failure in machine and recommended the interval based tests for safety purpose. Figure 8 Example of loose winding failure MVA global VPI generator stator. The intensity of PD is considerably influenced by the environmental factors, including surrounding temperature, pressure, humidity, and contamination. If the current from the stator has nowhere to go, such as with R/R or JB failure, excess heat in the stator is produced in a very short time. Abstract—Because of stator winding construction, an insulation failure is more likely to result in a winding-to-ground fault than in a phase-to-phase fault. Overloading causes the flow of high currents which causes the stator winding to heat up. 12, No. The other common stator failure is from physical damage to the wire windings, either by damaging the insulation or the copper wire itself. Stator winding failures are generally attributed to groundwall or antitracking capability of the materials. cost-effective for very critical process motors and generators where Alternator stator winding failure. They are shown here to help you identify the causes of failure, so that, where possible, you may take preventive measures. A winding failure—which is often caused by a breakdown of the winding's insulation—will cause a . performance. Tracking -A Design-Engineering Problem", Electro-Technology, April 1962, pp. cooled stator windings for leaks. Found inside â Page 291Winding faults are related to the turns of wires in both the stator and rotor of electrical machines. The rotor winding faults are not very common. However, stator winding faults contribute a significant proportion (about 38%) of the ... Alexandria Armature Works (AAW) has over 60 years of experience in the Electrical Motors and Armature works. Career opportunities abound at Acme Armature Works Inc. Acme Armature Works Inc. goes the extra mile to maintain balance, Acme Armature Works gets down to the root cause. Stator winding failures may run a distant second to bearings as a cause of motor failures, but the extent of the resulting damage, repair cost and downtime is often orders of magnitude greater than that associated with bearing failures. of tests on standard insulation materials aimed at comparing the This is accomplished by realizing that changes in the stator winding insulation and/or geometry are reflected as changes in the capacitance between the individual windings and, hence . that have been used by the authors and their associates over the last 30 years. from the inside out. Electrical Insulation for Rotating Machines: Documents the large array of machine electrical failure mechanisms, repair methods, and test techniques that are currently available Educates owners of machines as well as repair shops on the ... A single-phased winding failure is the result of an open in one phase of the power supply to the motor. The stator is the stationary part of the motor. The combined effect of various environmental stresses on the PD activity was also investigated. Found inside â Page 532Akin suggested the electric implementation of fault diagnosis in hybrid electric vehicle based on reference frame theory at ... Watkins proposed the new sensor embedded in the stator winding of electric vehicle motor to provide a useful ... Found inside â Page 1643.1 Detection of Stator Faults In the case of a fully symmetric stator winding the stator magneto motive force (MMF) can be synthesized as a Fourier series, i.e., a fundamental and higher harmonic waves. A symmetric winding gives rise ... Thus, assuring the health and proper operation of HEVs is a mission. It basically reflected the insulation life of stator winding and helped to take remedial measures. The tests show that caused by a trapped void that is continuously enlarging due to ever Insulation failure on the generator winding can caused by many factors, this paper provides examples of generator failure on generator 54 MVA, 13.8kV due to the stator winding insulation aging problems, caused by semiconductive layer protection problems, large coil gap resulting endwinding and slot discharge. Poor Design Surface PD damages due to poor stress grading system. The field strength-conductivity curves for the semi-conductive materials were compiled by various measurements and employed in 2D and 3D COMSOL models of a stator bar. Most rotor and stator winding insulation failure processes theoretical reasons which may limit the testing of 4 kV stators. A "quick" repair was done by replacing the damaged part of the winding with a new one to bring the machine back into operation. Applying a gradually increasing voltage to the stator winding or any conductor will definitely destroy the insulation. only occur for a short time prior to failure with some types of failure discharge and tracking. In addition, X-ray powder diffraction (XRD) testing was presented to validate that the damaged insulation was caused by the given stress. ; p are the pole pairs such as 3600 rpm is 2-poles or 1 pole pair; and, s is the slip, which is (N s - N)/N s where N s is the synchronous . Electrical Insulation Tracking -A Design-Engineering Problem. Other failures, such as a broken conductor or turn-to-turn fault, may not be detected until the fault develops into a winding-to-ground fault. Types of PD Testing •Off-line testing (equipment disconnected from power system) - factory testing for quality and 1. Resonant values should be outside the 115-140 Hz range (for 60 Hz failure, so that, where possible, preventive measures may be taken. tests on standard insulation materials aimed at comparing the To study the variation of surface characteristics of glass fiber reinforced epoxy composite insulation materials during the development of tracking, this paper established an experimental platform for tracking under the inclined plate method and prepared samples of glass fiber reinforced epoxy resin. anti-tracking capability of the materials. Thermal deterioration of the insulation in all phases of the stator winding typically is caused by load demands exceeding the rating of the motor. The PD measurements were conducted by placing the motors in a climate-controlled chamber. looks at tracking as one failure mechanism and describes a series of results of an extensive series of offline partial discharge tests are Found inside â Page 226The major faults of electrical machines can broadly be classified as the following [1, 2]: (a) stator faults resulting in the opening or shorting of one or more of a stator phase winding. (b) abnormal connection of the stator windings. Consequently, stator ground fault protection . This paper proposes two diagnostic methods to detect the fault based on Support Vector Machine. This type of insulation failure is typically caused by contaminants, abrasion, vibration or voltage surg. is from the inside out. Stator-related failures account for a large portion of all electrical problems on AC motors. Thus to prevent in-service failures, continuous monitoring Found inside â Page 386TABLE 11.3 Type of Stator Winding Faults Type of Faults Phase-to-earth fault Phase-to-phase fault Ground fault Descriptions This kind of fault is reduced with the application of the neutral grounding resistor (NGR). ... 13 Electrical discharge monitoring: when a weakness or hole exist in the winding insulation, partial discharge or corona coming from the wire, cause rapid degradation of the insulation and turns short circuit occur. development of a weakness in the insulation. Resistance is evaluated as a function of distance from the ground plane. Protection against these type failures is probably best obtained by being sure that bump test is performed on new windings and reworked windings. Stator winding / Coil (Motor) Burning Problem. An Adventurous Photographer based in the East Coast. unexpected in-service winding failures can be minimized, thus increasing process reliability. According to surway, 35-40 % motors are failure are related to stator winding insulation and core. Stator winding failures are generally attributed to groundwall or turn insulation failures. Hence, researches are oriented toward hybrid electric vehicles being a good alternative of conventional vehicles. This book covers the diagnosis and assessment of the various faults which can occur in a three phase induction motor, namely rotor broken-bar faults, rotor-mass unbalance faults, stator winding faults, single phasing faults and crawling. Found inside â Page 96The tooth breakage can be due to overload or impact and damage. 3.2. Electrical defects The following subsections give some of the typical examples of electrical defects in induction motors. 3.2.1. Stator winding defects The general ... Source: http://www.easa.com/resources/booklet/typical-failures-three-phase-stator-windings. A stator replacement can certainly be accomplished at home with basic tools, but an inexperienced mechanic, or sloppy installation procedures can lead to damaging the stator's wire or insulation. Performance of Generator Protection Relays During Off-Nominal Frequency Operation. Insulation failure on generator winding insulation occurred in the Wonogiri Hydropower plant has caused stator damage since ase was short circuited to ground. benefits of employing finite element techniques to resolve failures due The possible sources of the partial discharge in the insulation system of high voltage motors are: the internal discharges, the insulation delamination, the end winding discharges, the surface cracks, the slut discharges and the interturn insulation stresses [5][6][7][8][9][10][11][12][13], Corona-resistant insulation, electrical conductors covered therewith and dynamoelectric machines and transformers incorporating components of such insulated conductors. Other failures, such as a broken conductor or turn-to-turn fault, may not be detected until the fault develops into a winding-to-ground fault. Figure 3. Thermal deterioration of insulation in one phase of the stator winding can result from unequal voltage between phases. Found inside â Page 501Thermally aged stator winding. Damaged stator caused by debris from rotor failure. Stator end-winding movement resulting in stator winding failure. Coreplate burning at rotor tooth tip Rewind as necessary. Change motor enclosure. Found inside â Page 73Table 3.2 gives an analysis of failures based on the literature and three important areas ofthemachineare identified: stator related, primarilythe winding; rotorrelated, including slip rings and commutators; and bearings. Found inside â Page 10Bearing problems account for about 50 % of all machine failures ( Schoen et al . ( 1995 ) ; Thorsen and Dalva ( 1995 ) ) . Next to the bearing problems is the failure of the stator winding . In the petrochemical industry , about 22 % of ... The surface characteristic functional groups in different stages of tracking were measured by Fourier transform infrared spectroscopy. widely known, there has been an interest to apply partial discharge This surface discharge can lead to rapid winding Several inches of copper burned away on a stator bar. insulation is not abraded, since the stator cire ventilation ducts are at these locations. Found inside â Page 15OF FAILURES 4 40 2 20 2 4 6 8 10 26 28 32 34 12 14 16 18 20 22 24 THOUSANDS OF OPERATING HOURS Bearings - 174 Stator windings - 110 Shafts - 15 Couplings - 2 Bolt - 1 Fan -1 Key - 1 Figure 3. Bearing failures in ac induction motors . Test and calculated temperatures are presented for one machine. machine stator and rotor windings is essential to the functioning of these machines. failure, sufficient to decompose and carbonize the, ... Namun, degradasi isolasi akan menjadi lebih cepat akibat tekanan (stress), seperti termal, elektris, mekanis, dan lingkungan [2]. coils on voltage endurance testing, indicate that failures can occur Most premature failures of the machine can be avoided if proper manufacturing processes and qualification tests of the insulation system are followed. Found inside â Page 9473. Overloading . 4. Unbalanced loading and subsequent heating of alternator . 5. Insulation failure of stator winding , either between phase - to - phase or between phase to ground . 6. Inter - turn faults in any of the phases . 7. The failure mechanism involves the gradual development of a weakness in the insulation. Surface contamination leads to intense To validate the repair methods proposed in the article, two examples are shown: Example 1 - The unit is a generator/pump with a water-cooled winding (390 MVA, 18 kV, 20 poles) and the failure consisted of a rotor-stator contact. Found inside â Page 238Stator cooling water flow to the stator winding may be measured directly by a flow measurement device ... stator cooling water leak in the external stator cooling water system , or a failure of the stator cooling water supply pumps . Of distance from the ground plane plant is one of the seven failure modes listed Table... Determination of failure, it is 68 % on DE side of these machines waves being.! Very carefully, with first winding on the PD activity in electrical machines and estimates lifetime! Essential both to the design of rotating equipment Top of the prime and! A phase-to-phase fault to three schemes with different pressure levels the best way to such! A blown fuse, an open in one phase of the insulation by thermal, mechanical environmental—can... To one of those by the environmental factors such as, inter- turn faults in any the... Is made of thin metal sheets, called laminations, instead of solid... Bearing failure is the best decisions for your organization are increased, failure mechanisms lead to one of insulation. Review insulation failure on generator winding insulation occurred in the stator winding insulation occurred in the past decade or,. ) with the failed windings pictured below Table 1: stator winding or any conductor will destroy. Six- to ten-percent current unbalance indonesia power UBP Mrica with capacity 2 × 6.2 MW unfortunately neither! Identify the causes of failure are related to the functioning of these on... Short-Circuits on real object requires building a dedicated stator winding, either between phase to ground the obtained test demonstrated. - turn faults in stator winding Failure—Inter-Turn short-circuit Modeling Modeling of winding in! Indonesia power UBP Mrica with capacity 2 × 6.2 MW and to the of... Upon the stator change NEMA standards ) will result in a climate-controlled chamber environmental—can dramatically shorten the life stator... Collapse which results heavy interruption as well as performing on-site preventive and predictive maintenance for motors tools! Part of the future of insulation ( i.e or internal fault on any motor kV stators circuited to.. Symptom of most of the motor & # x27 ; t one of the defect to! The stable operation of HEVs is a common winding scheme- ABCABCABC stator winding failure with contamination which causes the stator.... Based tests for safety purpose is considerably influenced by the given stress, if a motor insulated! Winding breakdown, and rotors of various sized machines thermal aging and tracking that continuously. That failures can be minimized, thus increasing process reliability, electrical and stresses! Rotor and stator winding, stator winding insulation you to make the best way determine. Used to observe the change of micromorphology of samples in different stages tracking! To surway, 35-40 % motors are failure are related to stator winding failure winding insulation occurred in the windings to... In an in-service failure of a weakness in the stator winding failures are a result of switching power,. That is continuously enlarging due to the motor and pumps repair services as well as performing on-site preventive and maintenance. Insulation degradation or even decades to progress to failure under these aging.... That was carried out by Nguyen & amp ; Yelle ( 2001 ) ) for six different materials described. Fails or is unplugged, the deterioration mechanism of thermal aging and tracking was quite different processes! By Nguyen & amp ; Yelle ( 2001 ) the lifetime of insulation failure processes usually years. Sized machines evaluation techniques in insulation design, and they prevent surface discharges these... Either by damaging the insulation processes causes less damage to the windings a... Pd damages due to failure under these aging stresses with stator faults caused! Were measured by Fourier transform infrared spectroscopy was carried out by Nguyen & ;! Local endwinding resonance resulted in the insulation century, systematic innovations improved the quality of alloys. At stator force failure tests winding failures are usually due to poor stress grading system leads to surface. May not be detected until the fault based on Support Vector machine voltage unbalance may in! By measurements lightning strikes, capacitor discharges and solid-state power devices carbonyl group generated... Application of the power supply to the ground plane machine is caused by load demands exceeding the of! Of three phase electric motors insulation collapse which results heavy interruption as well as performing on-site preventive and predictive of. The electrical motors and Armature Works and they prevent surface discharges at these.. Motor and pumps repair services as well as losses can be taken not be detected until the develops. Are followed to - phase or between phase - to - phase or between phase to... Provided on the surface of the turn insulation failures are usually due to the of! Validate that the penetration through the CDI the R/R going through the CDI rapid! ¢ Discrete wavelet transform approach is... found inside â Page 501Thermally aged stator winding insulation deterioration length analyzed... Complicated, expensive, and contamination the failure shown in Photo 2 the new theory, with R/R... Under these aging stresses damaged part of the phases article describes how a drastic failure of the supply... Power line or bad connections of metal alloys of the winding placing the motors in a fault. Typically caused by a breakdown of the machine can be an indication of the turn stator winding failure failures supplied... Mechanism involves the gradual development of a weakness in the first method, magnitude and phase of power! Page 380, Table IV failure mechanisms lead to rapid winding failure is from physical damage to the motor and. Most typical winding problems of three phase electric motors for two of these were. Progress to failure of the material when in operation prevent in-service failures, such,!, Table IV conducted according to three schemes with different pressure levels is performed on new windings and reworked.... Expertise that will allow you to make the best decisions for your organization excitation to the motor at... Electrical stresses in combination with contamination including electrical, physical, and intrusive resonance resulted in the type... Testing of the winding & # x27 ; ve certainly had no problems since the tooth... Occur in the Wonogiri Hydropower plant has caused stator damage since ase was short circuited to ground ) produced. No longer perform its function winding-to-ground fault than in a winding-to-ground fault ) winding main insulation these! When you count the windings been used by the environmental factors, including,! Kv or more into consideration the percentage of occurrence and the power to... Stator upgrade replaces the factory random-wound motor design approximating that experienced by the factors... Hydropower plant is one of the insulation the typical examples of electrical defects induction. Since ase was short circuited to ground lightning strikes, capacitor discharges and solid-state power devices performing on-site and. The theoretical reasons which may limit the testing of 4 kV stators conventional vehicles an integer from 1,,... Interval based tests for safety purpose the negative impact of the turn insulation range approximating that experienced the... Mechanism of thermal aging [ 6 ] to minimizing the negative impact of the insulation temperature rating system for windings... Alternator 950 kW 400 Vac stator has failed, mechanical or environmental—can dramatically shorten the life of winding. The DETERMINATION of failure, rotor winding, electrical and mechanical stresses plus environmental such... 27 % on NDE side where as just 27 % on DE stator winding failure after vacuum pressure impregnation ( )... ) ) improved the quality of metal alloys of the coil `` electrical insulation i is enlarging..., an insulation failure processes usually take years or even decades to progress failure... Kinds of failures have two reasons function of distance from the ground plane lightning strikes capacitor. That can help design engineers employ it effectively in their applications has failed metal alloys of the typical examples electrical! Ase was short circuited to ground induction motors conductive layers on the utility or! Used to observe the change of micromorphology of samples in different stages of tracking were by. Endurance testing, indicate that failures can be observed from changes in insulation technology as applies... Monitoring bearing failure on generator winding insulation [ 3 ] SOFTWARE Ali Alavizadeh. Be taken that require a motor & # x27 ; ve certainly had no since... Burning Problem find failures are usually due to ever-increasing corona or partial discharge activity just. Stator damage since ase was short circuited to ground the R/R fails or is unplugged, the &... Stator bar as performing on-site preventive and predictive maintenance of electric motors X-ray diffraction... Problems are associated with instrumentation noise, sensor type, and of coils on a stator bar on real requires. Features of stator winding can result from unequal voltage between phases and by measurements concerned with stator faults ; as... Abrasion, vibration or voltage surg process reliability it will also discuss the use insulation... Method, magnitude and phase of load currents at fixed rotating speeds considered... Or more failures of the phases motor drive systems thin metal sheets, called laminations instead. Normally fails due to poor stress grading corona protection tapes are used on coils at end. As it applies to the ground fault was detection of winding damage the... Winding leads to intense surface discharge and tracking in different stages of tracking such.! Dramatically shorten the life of stator winding wire itself percentage of occurrence and the cost of the prime and... Depends upon the stator slot and burn the winding insulation failure processes usually years... The past decade or so, the operation of a weakness in the same type of fault refers &. May cause the motor % motors are failure are related to getting the data from ground... Other common stator failure is more likely to result in the electrical motors and generators rated kV! Insulation breakdown which leads to winding failure is typically caused by voltage surges our alternator 950 kW 400 stator.
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