Answer / narasimha

leak in the transformer mostly due to weakening of gaskets
in bushings & cover. the same was happened because of
temparature&aging of gaskets. periodical checkup &normal
loading 85% can help to stop oil keakage.

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 Answers  

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typically in power distribution substation. 1- Any idea how would be the graph of capacitor bank consumption verses time through the day . 2- How is the switching ( on and off ) of the capacitor bank, per need?

0 Answers   Siemens,

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can anyone explain 11kV 3core cable megger,hi pot test procedure with connection details?

0 Answers  

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What will be the impact on motor performance if a LT motor is rewound with changed motor winding data as given below:- Original winding data: total 04 wires = 02 wires of 17 SWG + 02 wires of 16.5 SWG. Changed Winding data: total 03 wires of 15.5 SWG wire size Motor rating: 160KW, 740RPM, 415V, ID FAN application. Normal Running Current = 95% of FL Current.

0 Answers   NFL,

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What is deference between MCB & MCCB & ISOLATOR

0 Answers   Prakash Industries, Standard Chartered,

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why motors are rated in HP?

3 Answers   HCL, ncpl,

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Hi,Any one has idea regarding the KPTCL Recuirtments for AE'e & JE's for the year of 2009-10???Kindly help in regards..

1 Answers  

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What kind of socket shall be provided for window type air conditioner with cooling capacity upto 18000 BTU/hr

0 Answers  

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how to calculate the change over time for star delta starter for different KW motor?

0 Answers  

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whydoes the p.f of diesel generator always be 0.8 explain how will you determine the shortcircuit capacity of network

1 Answers   Dalkia,

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How to calculate the heat load for a electrical room

0 Answers  

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For a stable system, where should the poles of a system be in a root loci plot?

0 Answers   GE,

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