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

Bredthauer, J.; Struck, N.

doi:10.1109/28.464534

Cited by 37 publications

(19 citation statements)

References 5 publications

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“…The IM starting process is the basic scientific and practical problem of this machine with a long tradition of observation [3][4][5][6][7][8][9][10][11][12][13][14][15]. The most common starting method of this machine is the direct-on-line method [3,4,8,11], which can be realized with or without the reduced voltage technique.…”

Section: Introductionmentioning

confidence: 99%

“…From an engineering point of view, the IM startup is very important as it defines machine protection (for example, the activation of the phase current protection relay) [5,22,23] and very troublesome as it has an impact on voltage sags in local areas [11,[24][25][26][27]. Namely, during the IM direct start-up, the machine current can be 6-7 times higher than the rated phase current, which can cause the activation of machine relays [12,22,23].…”

Section: Introductionmentioning

confidence: 99%

“…Namely, during the IM direct start-up, the machine current can be 6-7 times higher than the rated phase current, which can cause the activation of machine relays [12,22,23]. For that reason, the IM starting process duration is very important for proper machine protection-relay settings (for example, setting of the over-current protective devices) [3][4][5]22,23]. In addition, the high IM phase current can cause voltage sags (for example, in distribution power systems, in small power system areas, etc.…”

Section: Introductionmentioning

confidence: 99%

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An invertible dependence of the speed and time of the induction machine during no-load direct start-up

Ćalasan

2019

Automatika

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In this paper, an invertible dependence of the speed and time of the induction machine during no-load direct start-up is presented. Namely, based on the parameters of the induction machine equivalent circuit as well as on the basic, well-known, equation for machine torque, the analytical expression for the induction machine time-speed dependence during direct startup is derived. On the other hand, in order to obtain inverse i.e. speed-time dependence, the derived time-speed expression is rearranged in one nonlinear equation. As the derived nonlinear equation does not have an analytical solution, a novel iterative procedure, based on the usage of Lambert W function, is proposed for its solving. The results obtained by using the developed expressions for speed-time or time-speed curves are compared with the corresponding results obtained by using expressions known in the literature as well as with the results obtained by using a numerical time-domain computation method. Moreover, the results obtained by using the developed expressions have been compared with the corresponding experimental results to demonstrate the accuracy of the derived expressions. The Matlab code developed for solving the presented iterative procedure, as well as the Matlab code for induction machine speed-time curve determination, is also provided.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An invertible dependence of the speed and time of the induction machine during no-load direct start-up

Ćalasan

2019

Automatika

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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%

“…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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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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Petroleum Industry

Hamer¹

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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

Cited by 37 publications

References 5 publications

An invertible dependence of the speed and time of the induction machine during no-load direct start-up

An invertible dependence of the speed and time of the induction machine during no-load direct start-up

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

Petroleum Industry

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