Upload
jjasdxjz
View
726
Download
4
Embed Size (px)
Citation preview
WELCOMETHIAGARAJAR COLLEGE OF ENGINEERING (A Govt. Aided, ISO 9001:2008 Certified, Autonomous Institution Affiliated to Anna
University)MADURAI – 625 015Department of Electrical and Electronics Engineering
LOAD TEST ON DC COMPOUND GENERATOR
(LONG SHUNT)
PRESENTED BY,
V.Rajalakshmi -14E87 T.Naveena -14E80R.Priyadharshini -14E85 T.Palani Kumar -14E83 S.P.Nandhini -14E79 P.Prakash -14E84S.Priyanka -14E86 S.Padmanathan -14E82
Dc compound generator
Cumulatively Differential
Long Shunt
Short Shunt
CHARACTERISTICS
Aim:To conduct load test on DC compound generator (long shunt)and to determine itscharacteristics.Internal characteristics – generated emf Vs armature currentExternal characteristics - terminal voltage Vs load current
S NO APPARATUS SPECIFICATION
QUANTITY
1 MC VOLTMETER (0-300V) 1(0-10V) 2
2 MC AMMETER (0-50A) 1(0-1A) 1
3 RHEOSTAT 910Ω,0.7 A 24 CARBON
RHEOSTAT50Ω,4.1A 1
5 LOAD (40A,160V) 1
APPARATUS REQUIRED:
NAME PLATE DETAILS:S NO PARAMETERS MOTOR GENERATOR
1 RATED VOLTAGE 230V 160V2 RATED CURRENT 35.7A 38A3 RATED SPEED 1450rpm 1450rpm4 RATED POWER 7KW 6.1KW5 RATED FIELD
CURRENT0.58A 0.58A
FORMULAE USED:Eg = V + Ia (Ra+Rf),Ia =load current+ filed current
Eg = generated emfIa = armature currentRa = armature resistanceRf = series filed resistance
PROCEDURE:1. Make the connections as shown in the figure2. Keep the D.C motor field in minimum position and generator rheostat inmaximum position initially load should not be connected to generator out putterminals and are open circuited.3. Motor started with the help of a 3-point starter and its field regulator is adjustedso that rated speed of motor obtained4. The gen field rheostat is also adjust such that the rated voltage is obtained atthe gen terminals.5. By keeping the gen field excitation constant load is switched on varied in stepsand meters readings are tabulated.6. In each step of load variation readings are taken the motor is running at ratedspeed is achieved by adjusting motor field rheostat variation of load in speed iscontinued till the generator supplies rated current.7. When the current exceeds gen rated current decrease the load to zero and openthe DPST
S NO FIELD CURRE
NTIf(A)
LOAD CURRE
NTIL(A)
TERMINAL
VOLTAGEv
ARMATURE
CURRENTIa(A)
Eg=v+Ia(Ra+Rf)
1 0.35 0 160 0.35 160.049
2 0.21 1 94 1.21 94.17
3 0.17 2 76 2.17 76.30
4 0.15 3 68 3.15 68.44
5 0.13 4 60 4.13 60.58
6 0.11 5 52 5.11 52.71
LONG SHUNT DIFFERENTIAL COMPOUND
S NO FIELD CURRE
NTIf(A)
LOAD CURRE
NTIL(A)
TERMINAL
VOLTAGEv
ARMATURE
CURRENTIa(A)
Eg=v+Ia(Ra+Rf)
1 0.35 0 174 0.35 174.049
2 0.36 5 175 5.36 175.75
3 0.37 8 177 8.37 178.17
4 0.38 11 179 11.38 180.59
5 0.39 14 182 14.39 184.02
6 0.40 17 186 17.40 188.44
LONG SHUINT CUMLATIVE COMPOUND
MEASUREMENT OF Ra:S NO Va Vf ARMATU
RE CURREN
T(I)
Ra=Va/I
Rf=Vf/I
1 1.2 0.5 11 0.109 0.045
2 2.6 0.9 25 0.104 0.036
AVERAGE 0.1 0.0405
RESULT:By conducting load test the performance characteristics of DC compound generator were obtained.
Thank you