Troubleshooting Induction Motors
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Joined: Sep 2010
02-10-2010, 05:00 PM
Troubleshooting Induction motors.pdf (Size: 203.24 KB / Downloads: 80)
The keys to successful motor operation include a total understanding of the application, then choosing the proper type of motor for the application. This must then be followed by the proper installation – mounting, coupling, and a total understanding of the motor surroundings or environment. Of course, for continued success proper maintenance of the motor must also be performed. Many problems could be avoided if the application and environment were understood, while others may be caused by a changing environment in which the motor operates. In addition, some are due to choosing the wrong motor for the application or defects within the motor itself. This paper examines the most common mechanically or electrically originated motor problems and their preventative action.
TROUBLE with a motor, like trouble with any rotating machinery, ranges – depending on the situation – from aggravation to crisis. Certain problems seem to reoccur more frequently than others. Some problems could be avoided if the application and environment were understood, while others may be caused by a changing environment in which the motor operates, and, of course, some are due to the motor itself. These problems include the following.
??Motor has inadequate torque to drive the load.
??Motor takes too long to start.
??Overload or instantaneous trip.
??Overload relays take the motor off during full load operation.
Joined: Apr 2012
25-06-2012, 01:50 PM
TROUBLE SHOOTING.docx (Size: 19.04 KB / Downloads: 33)
In nhdc the water level is always low because maximum water is used in punasa hydro power plant, due to which all 8 turbines does not work at a time, so we could not get sufficient power. Therefore for starting we have to take power from near power stations.
To gain sufficient power we should construct a thermal power plant near n.h.d.c. omkareshwar. Otherwise the water of river kaaveri must be used in omkareshwar dam.
The loss in power is very high because maximum equipment used are mechanical, due to which friction increases in equipment’s. so the maintenances cost increases.
The maximum electrical and electronic equipments should be used bu replacing the mechanical equipments.
The power generated in omkareshwar dam is transferred to other cities but is not used in dam and omkareshwar. So we buy energy from other cities, which increases the cost of energy.
The energy used in omkareshwar and dam must be solar energy, wind energy, bio-gas energy
The oil used in transformer has to be changed in every 6 months or 8 months because the generation quality is very poor.
The oil used must be of high viscosity so that the generation quality increases.
Since due to the river the distance between the poles is large and the sag increases which result in power loss.
The bridge construction should be of high quality and the poles should be fitted on the bridges itself.
All the equipments, equipment structure, JBs, MOM box etc. are provided with double earth and connected to ground mat using 80 X 6 mm size galvanised earth strip
Local earth mat of size 1.5M X 1.5M made of MS strip size 50 X 6 mm is provided near MOM box of all the isolators and earth switches for the safety of working personnel. The local earth mat is also connected with the ground mat.
Distance Main - I Numerical Relay REL 521
Main - II Static Relay LZ 96
Power Swing Block Included in REL 521 and LZ 96 relay
Over voltage Stage - I (In built in REL relay)
Stage - II (RXEG21 Relay - One for each phase)
The protection and relay panels installed in the switchyard control room covers all 04 outgoing line feeders bays, Bus coupler bay, transfer bus bay and the bus bars of switchyard.
In electrical engineering, isolated-phase bus, also known as Phase-isolated Bus (PIB) in some countries, is a method of construction for circuits carrying very large currents, typically between a generator and its step-up transformer in a steam or large hydroelectric power plant. Each phase current is carried on a separate insulator, enclosed in a separate grounded metal housing.
Conductors are usually hollow aluminum tubes or aluminum bars, supported within the housing on porcelain or polymer insulators. The metal housings are electrically connected so that induced current, nearly of the magnitude of the phase current, can flow through the housing, in the opposite direction from the phase current.