Why IR value of the (HT cable Plus synchronous motor) is less while individually having IR values in GΩ?

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HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.

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nwhat are the main Components of servo motor?

0 Answers   BARC,

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what is the operating principle of contactor(power).along with disection?

3 Answers   NASA, Tech Mahindra,

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What is reactance? what is the function in Auto transformer and why high leakage reactance?

1 Answers  

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In Fluorescent tube there is a writing like 6500k . what this 6500k represents?

4 Answers  

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what instruments used for measuring of inductance and capacitance.

2 Answers  

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how many types of cbs?with pcific ratings?

1 Answers   Bhel,

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In 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.

0 Answers  

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How to Select transformer for 100HP motor plz... With calculation

2 Answers   Rasandik,

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they conducted technica for 1 hour..i also managed..they selected 5 boys and only one girl,myself got wait listed.whether they would call or not

2 Answers   MAHINDRA,

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How to calculate the current capacity of the 3C / 1C Al/Cu power cable???

2 Answers  

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