ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-445--2
NAVY NAVFAC P-8-624-34
Table 4-3. ELECTRICAL PERFORMANCE CHARACTERISTIC PARAMETERS
AC PRECISE (CLASS 1) (CONTINUED)
TEST METHOD
CHARACTERISTIC PARAMETER
VALUE
MIL-STD-705
b. Frequency characteristics
1. Regulation (%)
0.25
608.1
2. Steady–state-stability (variation (bandwidth %)
(a) Short term (30 seconds)
0.5
608.1
(b) Long term (4 hours)
1
608.2
3. Transient performance
(a) Application of rated load
(1) Undershoot (%)
1.5
608.1
(2) Recovery (seconds)
1
608.1
(b) Rejection of rated load
(1) Overshoot (%)
1.5
608.1
(2) Recovery (seconds)
1
608.1
4. Frequency adjustment range (Hz)
(a) 50 Hz
±2
511.2
(b) 60 Hz
±2
511.2
(c) 400 Hz
+20
+20–10
511.2
NOTE
1. The voltage shall stabilize at or above this voltage.
2. The generator set connected for three phase output and supplying a single phase, unity Power factor
load connected line-to-line, with no other load on the set. The load current to be 25 percent of the rated
full load current of the set.
4-11. MALFUNCTION INDICATOR TEST.
a. The malfunction indicator system is electrically isolated and independent of the protection system. Testing
of the indicators can be accomplished at the same time that the protective devices are tested in tests 6, 9, 10,
11, 12, 14, 15, 16, 17 and 18 of table 4-1.
b. In the event that one of the indicator circuits does not work, verify that the lamp is functional by operating
the test and reset switch on the fault indicator panel.
4-12. PHASE BALANCE TEST 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 manu–
factured or damaged.
b. Apparatus. A frequency meter (or tachometer as described and illustrated in MIL–HDBK–705. Method
104, or 109.1 and an rms indicating ac voltmeter having an accuracy of ± 0.1% of the reading shall be required
to perform both procedures. A means of separately exciting the generator is required since procedure II is
performed.
4-7
