ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

ARMY TM 9-6115-464-34AIR FORCE TO 35C2-445-2NAVY NAVFAC P-8-624-34(e) Results.1. Average the three valid power readings. This average is the observed maximum power value.2. Correct the observed maximum power value to standard conditions using the procedure inMIL–HDBK-705, Method 220.2, paragraph 220.2.3. This is the corrected maximum power value.3. Compare these results with the requirements of table 4-1.4-24. UNDER FREQUENCY PROTECTIVE DEVICE TESTa. General. For generators that power certain types of equipment, it is extremely important that the circuitinterrupter open when the frequency fails appreciably below rated value. Severe damage may otherwise resultto the powered equipment. To insure that the circuit interrupter will open at or before the critical frequencyvalue, the generators are equipped with an underfrequency protective device. The device on this generatoroperates electrically. Although the under frequency protective device must be capable of functioning at anyvoltage throughout the specified voltage operating range, it is necessary only to perform the test at the specifiedmaximum, at rated, and at minimum voltage limits.b. Apparatus Instrumentation for measuring load conditions shall be as described and illustrated in method205.1. paragraph 205.1.10 of MILL-HDBK-7050.c. Procedure.(1) Preparation for test. Connect a voltmeter and frequency meter to the generator set terminals, aheadof the circuit interrupter, and the remainder of the apparatus as shown in the applicable figure ofparagraph 205.1.10 of MIL-HDBK-705.(2) Test.(a) Operate the generator at rated speed and voltage, and at no load since the generator is equippedwith an electrical-type underfrequency protective device, this test shall be repeated with thevoltage adjusted to maximum and minimum voltage for the specified voltage operating range.(b) With the circuit interrupter closed, slowly decrease the operating speed until the protective devicecauses the circuit interrupter to open. The electric governor must be deactivated to sufficientlydecrease the speed on Class 1, precise sets.(c) Record the speed.(d) Repeat the test while rapidly decreasing the operating speed. Again record the speed.(e) Operate the generator at rated speed and voltage, and at rated load.(f) Repeat steps (b), (c) and (d).d. Results. Compare the test value of frequency with that given in table 4-1.4-25/(4-26 blank)