Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 3 of 5)

Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 2 of 5)

Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 4 of 5)

TM-5-6115-545-12 Power Unit Utility Pack Gas Turbine Engine Driven (Air Research Model PPU85-5) Non-Winterized and (Air Research Model PPU85-4) Winterized Manual
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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

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