Assessment and control of ignition risk of HT induction motor for increased safety Ex &amp;#x2018;e&amp;#x2019; as per Indian standard for explosive atmospheres

Ahirwal, Bhagirath; Chaterjee, T. K.; Singh, Arvind Kumar

doi:10.1109/pses.2011.6088251

Cited by 2 publications

(2 citation statements)

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“…The impulse voltage test assessment is done to prove the capability of the insulation system to withstand over voltages (due to lightning and switching surges) that may appear across it while in operation. The impulse test was carried out at BHEL, Bhopal with the help of a special 200 kV -2 stage impulse generators [23]. The prototype sample coil (one complete stator) was produced for 970KW motor.…”

Section: Impulse Voltage Test Assessmentmentioning

confidence: 99%

Design, Testing Analysis of High Tension Increased Safety Motor for Hazardous areas

Ahirwal

Chatterjee

2015

TIJEE

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The increased safety (Ex e) motors are designed for safe operation in the zone 1 and 2 hazardous areas. The present paper describes the significant design parameters and successful testing of Ex e high tension (HT) induction motor rated 970KW/6.6KV/18 pole/ 3Phase/ 50Hz as per IS/IEC 60079-7 standard. The comparison of some useful design parameters is also given between safe area motor and hazardous area motor in this paper. The Ex e high tension induction motor mentioned in this paper have been manufactured by Bharat Heavy Electricals Ltd. (BHEL), Bhopal, India during the project and main author was the project leader.

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Section: Impulse Voltage Test Assessmentmentioning

confidence: 99%

Design, Testing Analysis of High Tension Increased Safety Motor for Hazardous areas

Ahirwal

Chatterjee

2015

TIJEE

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“…Earlier Indian Standard IS 6381‐1972 was used by India to design, manufacture and test for increased safety motor in which risk assessments was not considered in the standard. The new standards require a rotor cage potential sparking and stator winding discharge risk assessments which depend on ignition risk factors of rotor and stator and working voltage of of motor [2].…”

Section: Introductionmentioning

confidence: 99%

Design, ignition risk assessment and testing of increased safety high tension induction motor for explosive atmospheres

Ahirwal

Chatterjee

2013

IET Electric Power Applications

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Increased safety (Exe) motors are widely used in zone 1 and 2 areas. Exe high tension (HT) motor is designed in such a way that it cannot produce any arc/spark and temperature of any part of motor in normal operating condition and specified abnormal condition. The risk assessment of Exe HT motor was introduced in the year of 2008 by ET22 Committee of Bureau of Indian Standards in IS:6381-2004 standards in India. The Exe motors were designed and risk assessment of ignition was carried out as per new standards. All necessary test on the Exe HT designed motors are also described in this paper. The starting time or blocking time in normal or abnormal condition of Exe motor depends on the insulation system of motor. Time t E of rotor or stator winding depends on some design parameters like mass of rotor winding, rotor copper loss, starting torque etc. Time t E is very critical for any HT Exe motor and it should not be less than 5 s as per IS:

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Assessment and control of ignition risk of HT induction motor for increased safety Ex ‘e’ as per Indian standard for explosive atmospheres

Cited by 2 publications

References 1 publication

Design, Testing Analysis of High Tension Increased Safety Motor for Hazardous areas

Design, Testing Analysis of High Tension Increased Safety Motor for Hazardous areas

Design, ignition risk assessment and testing of increased safety high tension induction motor for explosive atmospheres

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