Milton CAT 3516C 2000 kW 2500 kVA 60 Hz 1800 rpm 480 Volts Performance Data3 - Manual (Page 8)

Selected Model
Engine: 3516 Generator Frame: 826 Genset Rating (kW): 2000.0 Line Voltage: 480
Fuel: Diesel Generator Arrangement: 2628110 Genset Rating (kVA): 2500.0 Phase Voltage: 277
Frequency: 60 Excitation Type: Permanent Magnet Pwr. Factor: 0.8 Rated Current: 3007.0
Duty: STANDBY Connection: SERIES STAR Application: EPG Status: Current
Version: 38699 /38433 /38580 /3636
General Information
DM7802
GENERATOR GENERAL INFORMATION
I. GENERATOR MOTOR STARTING CAPABILITY CURVES
A. THE MOTOR STARTING CURVES ARE REPRESENTATIVE OF THE DATA
OBTAINED BY THE FOLLOWING PROCEDURE:
1. THE CATERPILLAR GENERATOR IS DRIVEN BY A SYNCHRONOUS
DRIVER.
2. VARIOUS SIZE THREE PHASE INDUCTION MOTORS (NEMA
CODE F) ARE STARTED ACROSS THE LINE LEADS OF THE
UNLOADED GENERATOR.
3. THE RESULTING VOLTAGE DIPS ARE RECORDED WITH AN
OSCILLOSCOPE.
4. MOTOR HORSEPOWER HAS BEEN CONVERTED TO STARTING
KILOVOLT AMPERES (SKVA).
5. RECORDED VOLTAGE DIPS HAVE BEEN EXPRESSED AS A
OF GENERATOR RATED VOLTAGE.
II. USE OF THE MOTOR STARTING CAPABILITY CURVES.
A. CALCULATE THE SKVA REQUIRED BY THE MOTOR FOR FULL VOLTAGE
STARTING ACROSS THE LINE IF THE VALUE IS NOT LISTED ON THE
MOTOR DATA PLATE.
1. MOTORS CONFORMING TO NEMA STANDARDS
MULTIPLY THE MOTOR HORSEPOWER BY THE NEMA SKVA/HP
FIGURE. FOR NEMA CODE F,USE 5.3 SKVA/HP; FOR NEMA
CODE G, USE 6.0 SKVA/HP.
2. ALL OTHER MOTORS:
MULTIPLY THE RATED VOLTAGE BY THE LOCKED ROTOR AMPERE
AND BY 0.001732. (IF THE LOCKED ROTOR AMPERES ARE NOT
LISTED, MULTIPLY THE FULL LOAD (RUNNING) AMPERES BY
B. USE THE ABOVE SKVA WITH THE MOTOR STARTING TABLE.
1. ACROSS LINE STARTING:
READ ACROSS THE ROW OF "ACROSS THE LINE STARTING SKVA
IF THE DESIRED VALUE OF SKVA IS NOT GIVEN, CALCULATE
THE DIP BY FINDING THE PROPER SKVA INTERVAL AND
INTERPOLATING AS FOLLOWS:
SKVA1 IS THE SKVA TABLE ENTRY JUST SMALLER THAN
THE DESIRED SKVA, DIP1 IS THE DIP FOR SKVA2, AND
SKVA2 IS THE SKVA TABLE ENTRY JUST GREATER THAN
THE DESIRED SKVA. THE DIP (IN PERCENT) AT THE
DESIRED SKVA IS:
DIP = DIP1 + (SKVA - SKVA1) * 2.5 /
(SKVA2 - SKVA1)
NOTE:VOLTAGE DIPS GREATER THAN 35% MAY CAUSE MAGNETIC
CONTACTORS TO DROP OUT.
2. REDUCED VOLTAGE STARTING:
REFER TO THE FOLLOWING TABLE. MULTIPLY THE CALCULATE
ACROSS LINE SKVA BY THE MULTIPLIER LISTED FOR THE
SPECIFIC STARTING METHOD. APPLY THE RESULT TO
THE STARTING TABLE AS IN II A, TO CALCULATE THE
EXPECTED VOLTAGE DIP:
Page 8 of 10 Caterpillar Generator Data
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