12-21. PHASE BALANCE (VOLTAGE).

Figure 12-8. Voltage Divider Transformer Network

TM-9-6115-604-34 Generator Set Diesel Engine Driven Tactical Skid Mtd 5 Kw. 1 Phase-2 Wire 1 Phase -3 Wire 3 Phase -4 Wire 120. 120/240 and 120/208 Volts Manual
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TM 9-6115-604-34 NAVFAC P-8-633-34 c. Procedure. WARNING To avoid injury to personnel, no electrical component shall be worked on while energized. When It Is necessary to work In the vicinity of energized equipment, all safety precautions shall be followed, such as use of rubber blankets for Insulation, use of rubber gloves, and use of Insulating tools and equipment. All Insulating tools such as rubber gloves and blankets shall be tested regularly. Disconnect all power before servicing. Residual voltage Is present at the generator leads even with the regulator turned off . Residual voltages can reach several hundred volts on this generator. Proper Insulation and Isolation of metering equipment shall be observed when testing the generator. (1) Connect the generator set load terminal to the phase sequence test apparatus for one of the three-phase voltage connections. Recheck the connections to ensure the L1, L2, and L3 of the generator set are connected to L1, L2, and L3 of the test apparatus. (2) Start and operate the generator set at rated voltage and frequency. The set indicating instruments shall be sufficient indication of output voltage and frequency. (3) Close the circuit interrupter and determine the direction of phase sequence (rotation) by observing the indicator, or by noting the direction of rotation if a three-phase motor is used. Record the results. (4) Phase sequence can also be checked by placing the PHASE SEQUENCE switch, located on the generator panel, to the GEN position. The 1-2-3 lamp should illuminate. (5) Place the AC PWR CKT BKR, located on the generator panel, to the dose position and the PHASE SEQUENCE switch to the BUS position. The 1-2-3 lamp should illuminate. d. Results. The phase sequence (rotation) as indicated by the test shall be checked against the wiring diagram for L1, L2, and L3. 12-21. PHASE BALANCE (VOLTAGE). a. General. Polyphase electrical equipment may not operate properly or may be damaged if the phase voltages of a polyphase generator differ greatly from each other. Also, large differences between the phase voltages of a polyphase generator may be an indication that the generator set has been improperly damaged or improperly repaired. b. Apparatus. Arms indicating ac voltmeter, having an accuracy of ±0.1 percent of the reading is required. c. Test. WARNING To avoid Injury to personnel, no electrical component shall be worked on while energized. When It Is necessary to work In the vicinity of energized equipment, all safety precautions shall be followed, such as use of rubber blankets for insulation, use of rubber gloves, and use of Insulating tools and equipment All Insulating tools such as rubber gloves and blankets shall be tested regularly. Disconnect all power before servicing. Residual voltage Is present at the generator leads even with the regulator turned off. Residual voltages can reach several hundred volts on this generator. Proper Insulation and Isolation of metering equipment shall be observed when testing the generator. (1) Connect the generator set for one of the operating voltages and frequencies. (2) Connect the voltmeter to read the ac output. NOTE The same voltmeter shall be used to measure all ac output voltages. (3) Start and operate the generator set at no load. 12-27

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