08-05-2012, 04:28 PM
OPEN CIRCUIT TEST AND LOAD TEST ON SELF EXCITED DC
SHUNT GENERATOR
[attachment=21592]
PRECAUTION
• The motor field rheostat should be kept at minimum resistance position.
• The generator field rheostat should be kept at maximum resistance position.
• At the time of starting, the generator should be in no load condition.
EC2259 Electrical Engineering And Control System Lab Manual
Prepared by G.Panneerselvam, Vel Tech Multi Tech
CIRCUIT DIAGRAM FOR OPEN CIRCUIT AND LOAD TEST ON SELF EXCITED
EC2259 Electrical Engineering And Control System Lab Manual
Prepared by G.Panneerselvam, Vel Tech Multi Tech
PROCEDURE
Open circuit 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 Open Circuit Voltage (Eo)
and corresponding Field Current (If) are tabulated upto 150 % of Rated Voltage of
Generator.
• The motor is switched off by using the DPIC switch after bringing all the rheostats
to their 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 current by closing the DPST switch.
• After tabulating all the readings the load is brought to its initial position gradually.
• The Prime Mover is switched off using the DPIC switch after bringing all the
rheostats to their initial position.
GRAPH
The graph are drawn as
• Open Circuit Voltage Vs Field Current
• Load Voltage Vs Load Current
SHUNT GENERATOR
[attachment=21592]
PRECAUTION
• The motor field rheostat should be kept at minimum resistance position.
• The generator field rheostat should be kept at maximum resistance position.
• At the time of starting, the generator should be in no load condition.
EC2259 Electrical Engineering And Control System Lab Manual
Prepared by G.Panneerselvam, Vel Tech Multi Tech
CIRCUIT DIAGRAM FOR OPEN CIRCUIT AND LOAD TEST ON SELF EXCITED
EC2259 Electrical Engineering And Control System Lab Manual
Prepared by G.Panneerselvam, Vel Tech Multi Tech
PROCEDURE
Open circuit 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 Open Circuit Voltage (Eo)
and corresponding Field Current (If) are tabulated upto 150 % of Rated Voltage of
Generator.
• The motor is switched off by using the DPIC switch after bringing all the rheostats
to their 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 current by closing the DPST switch.
• After tabulating all the readings the load is brought to its initial position gradually.
• The Prime Mover is switched off using the DPIC switch after bringing all the
rheostats to their initial position.
GRAPH
The graph are drawn as
• Open Circuit Voltage Vs Field Current
• Load Voltage Vs Load Current