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For polarity test on a 11/3.3kV 2.5MVA delta-star Unit Auxiliary transformer,415V 3-phase supply was applied at the HV. Connection between Aa was made with a 2.5mm cable. As soon as power was switched on the cable caught fire and burnt. This test was then abandoned. It is noteworthy to say that a similar cable was also used in a similar transformer for the same. The cable did not burn and test was successfully completed with good result. What is wrong? Please, help me out.
3 7683In the Variable Voltage Variable Frequency Drive, how the Voltage and Frequency varied ? Is it varied in the Inverter part of the Drive ? Please give us supporting document if any.
1953in our sub station why we step down firstly 33kv\11kv then 11kv to 430v. can we direct step down 33v to 430.v.
18 42907When semiconductor fuse does save thyristor in each cycle of conduction? Why under voltage setting keep less in SPRS and more in DC drive?
2094Post New Electrical Engineering Questions
What is a copper loss or i2r loss pc?
help me with the question that might be ask on the interview for technical position
How to run a three phase motor into single phase........
What is Scheme Test of High Voltage Switchgear. Which tests it includes.
How to calculate impedance volt in Transformer?
what irequirment need to be followed when working on live equipment
what is the voltage between earth to neutral in lift.
During underground cabling in landscape area what did we cover the cable with to prevent the electric shock & protect the cable?
What should be the Sandwitch type Al. bus bar capacity for 2 M.W.Gen. set, having continuous full load current- 3463 Amps,ambient temp.- 50 Deg. C., Required temp. raise-20 deg.C., it will run 24 hrs, 365 days on full load, required highly reliable.
What are the types of instrument transformer?
what is the difference between oil surge relay and buchholz relay.
What is the feedback in the control system?
What does the kvar means?
What is sink and source?
why incomer bay is required before transformer bay if there are more than 1 nos. of transformer bay.
