Answer / g.nandha kumar

Cable losses depend on the material of the conductor. Basic
formula for loss is I^2 R. R varies with the ambient
Temperature and can be noted from the test report from the
manufacturer of cable. Current of loss can be calculated
based on the voltage drop in the cable. I=(V1-V2)/R.

Why short circuit calculation is not required in LT cable sizing and requiredin HT cable sizing only

2 Answers   Chemtex,

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how much leakage current is allowed in MC61A L&T make relay?

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Hi ,what the accurate method to set correct(In) over load to protect the 3~ motor

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Explain what is use of lockout relay in ht voltage?

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how can we measure 220kv or more than these voltages ...?and also how can we conform whether we r getting 220kv from generating stations throuth the h v transmission lines?

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why the secondary current transformer cannot left open

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how can a transformer test by megger?

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Comment on the working principle of operation of a single-phase transformer.

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iii) A shunt motor runs at 70 rad/sec from a 460V supply and takes in an armature current of 100A. Resistors of 2.52 ohms and 1.64 ohms are connected in series with the armature and in parallel with the armature respectively. The field excitation remains direct from the 460V supply but the generated torque is halved. Determine the new running speed. Neglect brush voltage drop. The armature resistance is 0.4 ohms. [15]

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can transformer develop three phase poer from a single phase source?

2 Answers  

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