how can you calculate the value of external resistance
inserted in a slipring industion motor? (eg. 110 kw / 990
rpm/50Hz/stator v-415/stator Amp-195/Rotor V-440/Rotor amps-
151.)

Answer Posted / purushottam

This motor is used for both purpose as it is used in 15 Ton
EOT crane main Hoisting / Lowering application. External
resistance used for speed control & for High Starting Torque
both.

Is This Answer Correct ?    23 Yes 5 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

How to select the earthing transformer,for DELTA TO DELTA TRANSFORMER OR ALTERNATOR SIDE.Pls post your answers and calculation.

1866


What is Electrical Grade Aluminum for Tubular BusBars. i am confused between 6063 and T6 or T5 and what is BS 2898 and BS 159?

1420


my bachelors was done with EEE now i got admit in NU with CS as course. how to answer this qns 1) why u choose cs? 2) why u changed from eee to cs

1272


mccb service sittings be done?

1421


why Lightening Arrester Probe sharp at Top of telecom tower.

1092






What are approaches to tackle sedimentation problem of reservoir?

587


what is the maximim current drawn by 1 phase and three phase welding machine

1447


sent to a site and asked to explain how you would like a twenty seven flour building should be supplied with lighting and sockets plus a water boiler.

1490


What are m circles?

659


Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

1747


Actually I have a doubt on neutral and earth.we use Ac power without taking neutral by connecting to earth,but at that time does it affects on efficiency of any electrical components or no? If yes how?

951


1.what is the difference between transformer differential and busbar differential.2)why we are using 2 slope for trafo diif and 1 slope for busbar diff.3)what is the purpose of metrosil and stabilizing resistor in high impedance relay circuit.4)how metrosil reduce the peak volage.5)what is the funtion of stabilizing resistor

4268


can we find the inductance of a induction motor?

1550


how i calculate the syncrones generator NGR resistance .if we have a 6mw generator line voltage of generator 11kv also line current 393.3 ampere.

1659


what is earth fault relay 64T, why it is used in main Incomer and neutral CT of Transformer.

2966