what is the meaning of 5% droop or 7% droop in AVR?


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Recently we had experienced following problem All RCCB breakers (connected to the load as well as spares) connected to various UPS systems at various floors at a high rise building tripped during a power break down and upon starting up of generator.This Generator is recently inducted into the installation. Can any one explain the reason behind this tripping. Regards Viswanathan

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. What should be the minimum and maximum ohmic value for earthing?

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Show formula which gives full load current 4.8 amps of a 3 HP motor and 27 amps of a 20 HP motor having 3 phase 460 volts, 0.8 Pf.

2 Answers  


Why the transformers are rating in KVA.?

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The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.

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wt wil happen if a 120kv line is grounded

4 Answers  


Sir I hv to fix 20 ton ac how much electrical power need apply?

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what is meant by CT burden = 10 VA?

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in 132 kv substation ligtning arrestor(120 kv) connected to line. but line voltage comes to 132 kv, it operate or not???

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why efficiency of generator is greater than motor?

2 Answers  


Though transformer consist winding which usually cause reactive power change in both generator and motor but it wont affect reactive power passing through transformer why?

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