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Page Name: Synchronous Machines


Posted by: fine project uploader
Created at: Wednesday 14th of March 2012 12:12:19 AM
Last Edited Or Replied at :Wednesday 14th of March 2012 12:12:19 AM
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voltage is measured at each step along the way.
It is thus possible to obtain an open-circuit characteristic of a generator (Ef or Vt versus If) from this information
Short-circuit test
Adjust the field current to zero and short-circuit the terminals of the generator through a set of ammeters.
Record the armature current Isc as the field current is increased.
Such a plot is called short-circuit characteristic.
DC Test
The purpose of the DC test is to determine Ra. A variable DC voltage source is connected between two stator terminals.
The DC source is adjusted to p..................==> [ Click Here to Read More ]



Page Name: OPEN CIRCUIT AND SHORT CIRCUIT TEST ON SINGLE PHASE TRANSFORMER


Posted by: project helper
Created at: Saturday 22nd of December 2012 03:53:56 AM
Last Edited Or Replied at :Saturday 22nd of December 2012 03:53:56 AM
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OPEN CIRCUIT AND SHORT CIRCUIT TEST ON SINGLE PHASE TRANSFORMER





PROCEDURE

The connections are given as per the circuit diagram.
The DPST switch is closed.
The terminal (secondary) voltage of the transformer is adjusted to the rated value by varying the auto transformer.
The readings of all the meters are noted.



Short circuit test
PROCEDURE


The connections are given as per the circuit diagram.
The DPST switch is closed.
The terminal (secondary) current of the transformer is adjusted..................==> [ Click Here to Read More ]



Page Name: OPEN CIRCUIT SHORT CIRCUIT TEST ON A SINGLE PHASE TRANSFORMER


Posted by: project helper
Created at: Tuesday 30th of October 2012 07:21:02 AM
Last Edited Or Replied at :Tuesday 30th of October 2012 07:21:02 AM
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OPEN CIRCUIT & SHORT CIRCUIT TEST ON A SINGLE PHASE TRANSFORMER



PRECAUTIONS:
1. Auto Transformer should be in minimum voltage position at the time of closing & opening DPST Switch.




PROCEDURE:
OPEN CIRCUIT TEST:

1. Connections are made as per the circuit diagram.
2. After checking the minimum position of Autotransformer, DPST switch is closed.
3. Auto transformer variac is adjusted get the rated primary voltage.
4. Voltmeter, Ammeter and Wattmeter readings on primary side are noted.
5. Auto tran..................==> [ Click Here to Read More ]



Page Name: OPEN CIRCUIT TEST AND SHORT CIRCUIT TEST ON SINGLE PHASE TRANSFORMER


Posted by: project ideas
Created at: Tuesday 08th of May 2012 06:04:34 AM
Last Edited Or Replied at :Tuesday 08th of May 2012 06:04:34 AM
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ide (X01) = in Ohms
Efficiency and Regulation
10. Output Power = X ×KVA × cosf in Watts.
Where, X-Fraction of load
KVA - power rating of Transformer and Cosf - Power factor

EC2259 Electrical Engineering And Control System Lab Manual
Prepared by G.Panneerselvam, Vel Tech Multi Tech
11. Copper loss = X2 × Wsc in Watts
Where, Wsc- Copper Loss in Short Circuit condition
12. Total Loss = (Cu Loss + Iron Loss) in Watts
13. Efficiency = x 100 in %
14. Regulation = × 100 in %
Where, V2o – Open Circuit Voltage on HV side.

PRECAUTION

• No Load Condition should be obser..................==> [ Click Here to Read More ]



Page Name: OPEN CIRCUIT TEST AND LOAD TEST ON SEPARATELY EXCITED DC GENERATOR


Posted by: project ideas
Created at: Tuesday 08th of May 2012 06:00:39 AM
Last Edited Or Replied at :Tuesday 08th of May 2012 06:00:39 AM
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tor is switched off by using the DPIC switch after bringing all the rheostats to initial
position.
Load test
• Connections are given as per the circuit diagram.
• The Prime Mover is started with the help of the three point starter and it is made to run at rated
speed when the Generator is disconnected from the load by DPST switch..
• By varying the Generator field rheostat gradually, the Rated Voltage (Eg) is obtained.
• The Ammeter and Voltmeter readings are observed at no load condition.
• The Ammeter and Voltmeter readings are observed for different loads up to the rated c..................==> [ Click Here to Read More ]



Page Name: Synchronous Machines


Posted by: fine project uploader
Created at: Wednesday 14th of March 2012 12:12:19 AM
Last Edited Or Replied at :Wednesday 14th of March 2012 12:12:19 AM
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r to completely describe the behaviour of a real synchronous generator:
The saturation characteristic: relationship between If and f (and therefore between If and Ef)
The synchronous reactance, Xs
The armature resistance, Ra
The above three quantities could be determined by performing the following three tests:
Open-circuit test
Short-circuit test
DC test
Open-circuit test
The generator is turned at the rated speed
The terminals are disconnected from all loads, and the field current is set to zero.
Then the field current is gradually increased in steps, and the terminal ..................==> [ Click Here to Read More ]



Page Name: SION Vacuum Circuit-Breaker


Posted by: project expert
Created at: Saturday 21st of January 2012 03:05:07 AM
Last Edited Or Replied at :Saturday 21st of January 2012 03:05:07 AM
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SION Vacuum Circuit-Breaker For Standard Applications


SION Vacuum Circuit-Breaker - OEM Package 3. Product Features


Product Features


The slide-in module contains all necessary components for the circuit-breaker compartment of a panel.
Signals for the service and disconnected positions are transmitted to the module connector at the low-voltage interface of the vacuum circuit-breaker via the position switches of the drawout element.

Your Benefit


Easy integration in the panel.
The slide..................==> [ Click Here to Read More ]



Page Name: LOAD TEST ON 3-PHASE SQUIRREL CAGE INDUCTION MOTOR


Posted by: project report expert
Created at: Friday 29th of July 2011 04:55:10 AM
Last Edited Or Replied at :Monday 22nd of October 2012 12:12:17 AM
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AIM:
To draw the performance characteristics of 3-phase squirrel cage induction motor by conducting load test.
THEORY:
A 3-phase induction motor consists of stator and rotor with the other associated parts. In the stator, a 3-phase winding is provided. The windings of the three phase are displaced in space by 120º.A 3-phase current is fed to the 3-phase winding. These windings produce a resultant magnetic flux and it rotates in space like a solid magnetic poles being rotated magnetically.

..................==> [ Click Here to Read More ]



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