Voltage Adjustment

Parallel Operation - TM-55-1930-209-14P-9-4_30

Parallel Operation - TM-55-1930-209-14P-9-4_32

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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Voltage Adjustment The voltage level and voltage droop adjustments determine the amount of circulating currents between generators. Carefully matched voltage regulator adjustments will reduce the circulating currents. Loads of .8 power factor (primarily motors) require a generator voltage droop of about 5%. Voltage droop is expressed as the percentage of voltage change from no load to full load. Use the same voltmeter to make adjustments on each unit to be paralleled. 1. Adjust voltage as described for Single Unit Operation, Initial Start-Up. 2. With the engine running at high idle, turn the voltage droop clockwise about 1/2 of full range. If driven load is to be unity power factor, set the voltage droop control on all generators at 1/2 of full range and proceed to Step 7. If driven load is to be normal (0.8 power factor) proceed to Step 3. 3. Readjust the voltage level control until the voltage is about 5% above desired voltage. 4. Apply full load at .8 power factor. NOTE: If a generator is to be paralleled with other generators, the voltage droop of each generator must be the same to satisfactorily divide reactive load. 5. Readjust the voltage droop control to obtain desired voltage with full load at .8 power factor. 6. Repeat Steps 3, 4 and 5 for each generator to be paralleled until line voltage is equal to desired level at .8 power factor and no load voltage is approximately 5% above rated voltage. 7. Parallel generators and apply the driven load (see the topic Operation/Paralleling). If the sum of the amps of the individual generator amperes exceeds the total amps going to the load by 10% at full load, adjust voltage droop controls to share current proportionally between generators. CAUTION Do NOT exceed rated ampere load on any single generator. 8. Tighten the locknuts on all controls and install the access cover. Condition 3 has been met. Starting Multiple Units Starting-Units are started the same as single units. Paralleling Units may be paralleled at no load or paralleled with units under load. To parallel two or more units the following conditions must be met: 1. Same phase rotation. 2. Same voltage level. 3. Same voltage droop. 4. Same frequency. 5. Voltages must be in phase. The first three conditions have been met in the initial start-up for parallel operation. 1. Start the unit to be paralleled according to the procedure in the engine operation section. 2. Turn the synchronizer lights on. 15

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