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

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ARMY TM 9-6115-464-34AIR FORCE TO 35C2-445-2NAVY NAVFAC P-8-624-34(2) Test.(a) Start and operate the generator set and allow the set to stabilize at rated load, rated voltage andrated frequency. During this period record all instrument readings including thermal instrumentationat minimum intervals of 10 minutes. If necessary, adjustments to the load, voltage and frequencymay be made to maintain rated load at rated voltage and frequency. Adjustments to the voltage andfrequency may be made to maintain rated load at rated voltage and frequency. Adjustments to thevoltage and frequency shall be limited to those adjustments available to the operator, specificallyadjustments to the voltage or frequency adjust devices. On sets utilizing a droop type speed controlsystem as the prime speed control, the speed and droop portions of the control may be adjusted.No other adjustments to the voltage and frequency control systems shall be made. Adjustments toload, voltage or frequency controls shall be recorded on the data sheet at the time of adjustment.Stabilization shall be considered to have occurred when four consecutive voltage and currentreadings of the generator (or exciter) field either remain unchanged or have only minor variationsabout an equilibrium condition with no evident continued increase or decrease in value after thelast adjustment to the load, voltage, or frequency has been made.(b) No further adjustments shall be made to any set control for the remainder of this test except thecontrol panel voltage adjust device.(c) Record all instrument readings.(d) Remove load.(e) Record all instrument readings (after transients have subsided).(f) Adjust the terminal voltage to the maximum specified value.(g) Record all instrument readings.NOTEAt voltages above rated values, the generator will be supplying less than rated current,and at voltages below rated values, the generator will be supplying greater than ratedcurrent. Caution should be taken to avoid damage to instrumentation and load banks.(h) Apply rated load (rated kw at rated power factor).(i) Record all instrument readings (after transients have subsided).(j) Remove load and adjust voltage to the maximum attainable value or to a value just prior toactuation of the overvoltage protection device.NOTEThe output voltage may exceed the rating of connected equipment.(k) Record all instrument readings (after transients have subsided).(l) Apply rated load.(m) Record all instrument readings (after transients have subsided).(n) Adjust voltage to the minimum specified value at rated load.(o) Record all instrument readings (after transients have subsided).(p) Remove load.(q) Record all instrument readings (after transients have subsided).4-9
ARMY TM 9-6115-464-34AIR FORCE TO 35C2-3-445-2NAVY NAVFAC P-8-624-34(r) Adjust voltage to the minimum attainable value or a value just prior to activation of the undervoltageprotection device.(s) Record all instrument readings (after transients have subsided).(t) Repeat steps (a) through (s) above for all other voltage connection(s).d. Sample Calculations. Regulation (droop) is defined for the the purposes of this method as the no-land valueminus the rated load value divided by the rated load value the quantity expressed in percent.% Regulation =(No–Load Voltage) – (Rated-Load Voltage) x 100(Rated–Load Voltage)e. Results. The data sheets shall indicate the voltage regulation as a percent of rated voltage within thespecified limits at the minimum and maximum specified voltages and the regulation as a percent of ratedvoltage at the extremes, the maximum and minimum voltages attainable and the actuation of the protectiondevices (if applicable). Compare these results with the requirements of table 4-1.4-14. FREQUENCY AND VOLTAGE REGULATION, STABILITY, AND TRANSIENT RESPONSE TEST(SHORT-TERM).a. General. The frequency regulation (sometimes referred to as droop) of a generator set is the maximumdifference between the no load value of frequency and the value at any load up to and including rated load.This difference is expressed as a percentage of the rated frequency of the generator set. The voltage regulationis expressed similarly except that the rms value of voltage is used.Frequency stability describes the tendency of the frequency to remain at a constant value. Generally, theinstantaneous value of frequency is not constant but varies randomly above and below a mean value. Stabilitymay be described as either short-term or long–term depending upon the length of time that the frequency isobserved. Another term, bandwidth, describes the limits of these variations. Bandwidth is expressed as apercentage of the rated frequency of the generator set. Voltage stability is described similarly.Frequency transient response describes the reaction of the frequency to a sudden change in somecondition; such as, a load change on a generator set. This response consists of the amount of excursionbeyond the mean of the new operating band, and the recovery time. The recovery time is the interval beginningat the point where the frequency leaves the original prescribed operating band and ending at the point where itenters and remains within the new prescribed operating band. The amount of surge is expressed as apercentage of the rated frequency of the generator set. The recovery time is expressed in seconds. The voltagetransient response is described similarly.b. Apparatus. Instrumentation for measuring load conditions, field voltage and current, and ambienttemperature shall be as described and illustrated in MIL-HDBK-705. In addition, recording meter(s) forrecording voltage and frequency shall be required.4-10
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ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

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