CAUTION
THE KILOWATT METER AND AC AMMETER INDICATE PERCENTAGES AND
DO NOT INDICATE TRUE KW AND AMPERE READINGS.
STEP 7.
WITH NO EXTERNAL LOAD ON THE PARALLELED SETS, ADJUST THE FREQUENCY ADJUST
RHEOSTAT OF THE “ON-COMING” SET UNTIL BOTH RATED LOAD METERS (KILOWATT) READ ZERO.
ADJUST THE VOLTAGE ADJUST RHEOSTAT OF THE
“ON-COMING SET UNTIL THE PERCENT OF RATED
CURRENT METERS (AMMETERS) ON BOTH SETS READ ZERO.
TURNING COUNTERCLOCKWISE WILL DE-
CREASE READINGS.
STEP 8.
APPLY LOAD TO THE SETS.
THE KILOWATT LOAD SHOULD DIVIDE SO THAT THE LOAD
ON EACH SET IS EQUAL.
IF THE LOAD AND CURRENT ARE NOT SHARED EQUALLY, ADJUST THE
VOLTAGE AND FREQUENCY RHEOSTATS OF THE “ON-COMING” SET UNTIL LOAD AND CURRENT ARE
DIVIDED EQUALLY BETWEEN THE GENERATOR SETS.
STEP 9.
THE CURRENT SHOULD DIVIDE SO THAT THE OBSERVED DIFFERENCE BETWEEN THE CUR-
RENT ON ANY PHASE BETWEEN THE “ON-LINE” AND “ON-COMING” SETS IS NOT MORE THAN 20
PERCENT. IF
STEP 10. TO
THE READINGS ARE NOT WITHIN 20 PERCENT, NOTIFY HIGHER LEVEL MAINTENANCE.
NOTE
IF THE REVERSE POWER INDICATOR OF EITHER SET ILLUMINATES
AND THE MAIN LOAD CONTACTOR OPENS, OPEN THE MAIN POWER
SWITCH AND REPARALLEL THE GENERATOR SETS.
CAUTION
WHEN GENERATOR SETS ARE BEING OPERATED IN PARALLEL, ONE OR
MORE OPERATORS MUST REMAIN WITH THE SETS TO MONITOR THE RAT-
ED LOAD AND CURRENT METERS.
NOTE
TWO OR MORE GENERATOR SETS CAN BE OPERATED IN PARALLEL.
PARALLELING PROCEDURES-ARE THE SAME AS THOSE DESCRIBED
ABOVE.
ONE GENERATOR AT A TIME IS BROUGHT ON LINE.
CAUTION
PRIOR TO REMOVAL OF GENERATOR SETS FROM PARALLEL OPERATION,
MAKE SURE THE LOAD DOES NOT EXCEED THE FULL LOAD RATING OF
GENERATOR SETS(S) REMAINING ON LINE.
REMOVE A GENERATOR SET FROM PARALLEL OPERATION, PLACE THE CIRCUIT
BREAKER SWITCH OF THE SET IN THE OPEN POSITION.
STOP THE SET AS DESCRIBED IN FIGURE
2-8.
B - PARALLEL OPERATION (LOAD TRANSFER)
THE FOLLOWING METHOD OF PARALLEL OPERATION IS TO BE USED WHEN IT IS NECESSARY TO
TRANSFER THE LOAD FROM ONE SET TO THE OTHER WITHOUT INTERRUPTING POWER.
Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 3 of 5)
Change 12
2-26.1
