Risk of ignition due to transition currents in medium voltage motors for classified locations

Bredthauer, J.; McClung, L.B.; Mohla, D.C.; Tretzack, H.

doi:10.1109/ias.1991.178028

Cited by 3 publications

(3 citation statements)

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“…These components together with leakage IJEEI ISSN: 2089-3272  Performance analysis of increased safety HT induction motor with … (Bhagirath Ahirwal) 64 components due to stator core magnetic saturation induce circulating current to flow in any closed conducting circuits. The current causes arcs and sparking at the joints of a multi-section motor enclosure [4,5]. The stray end winding field will be the strongest during locked rotor and starting conditions.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Increased Safety HT Induction Motor with Higher Stator Coil Pitch for Classified Hazardous Area

Ahirwal

Chatterjee

2014

IJEEI

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The increased safety (Ex e) high tension (HT) motors are widely used in the petroleum industries and area where explosive atmosphere is present. The time t E and I A /I N ratio value is very important for Ex e motor. The time t E of rotor and or stator winding, I A /I N ratio and temperature rise can be affected by increasing the stator coil pitch. The coil pitch of stator were increased for three different ratings of three phase HT Ex e induction motors and redesigned for analyzing the temperature rise, t E and performance. The relevant tests were performed and performance characteristic of motor was compared with normal design motor.

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Section: Introductionmentioning

confidence: 99%

“…Sparking may also occur across the air gap due to the movement of the bars due centrifugal and electromagnetic influences. Sparking generally occurs during the starting condition [4,5]. Corona discharges and surface tracking [6] on contaminated winding can also cause sparking.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Increased Safety HT Induction Motor with Higher Stator Coil Pitch for Classified Hazardous Area

Ahirwal

Chatterjee

2014

IJEEI

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“…During starting, high currents are induced into the frame components as discussed by Bredthauser et a1 in [4]. The currents circulate between parts.…”

Section: Sparking and High Current Flow Between Rotor Componentsmentioning

confidence: 98%

Sparking electrical discharge and heating in synchronous and induction machines: Can it be controlled?

Dymond

Record of Conference Papers. IEEE Industry Applications Society 44th Annual Petroleum and Chemical Industry Conference

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It is impossible to eliminate all occurrences of sparking and localized heating from the interior of electric machines during the 20 to 40 years that they are normally in service. One can minimize the probability of sparking and localized heating by exercising precautions which will eliminate or minimize the sources of these conditions in AC machines. Most new machines have a low probability of sparking but some design steps can be taken which condition the machine as a sparking type or a nonsparking type. The paper discusses the aspects of arcing between rotor and stator in the air gap, sparking between rotor parts, sparking between frame components, sparking due to broken or open bars and endrings, and surface discharge on the stator winding. Also discussed is what action, if any, can be taken in design, application, and maintenance to eliminate or control these problems.designers and users concluded that motors do not spark or arc unless there is an electrical or mechanical failure. IntroductionFIGURE 1. Air gap sparking at locked rotor.

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Starting of large medium voltage motors design, protection and safety aspects

Bredthauer

Struck²

Proceedings of IEEE Petroleum and Chemical Industry Technical Conference (PCIC '94)

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Risk of ignition due to transition currents in medium voltage motors for classified locations

Cited by 3 publications

References 0 publications

Performance Analysis of Increased Safety HT Induction Motor with Higher Stator Coil Pitch for Classified Hazardous Area

Performance Analysis of Increased Safety HT Induction Motor with Higher Stator Coil Pitch for Classified Hazardous Area

Sparking electrical discharge and heating in synchronous and induction machines: Can it be controlled?

Starting of large medium voltage motors design, protection and safety aspects

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