TM 5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 (c) In    one    step,    increase    the    load current     to     the     overload     current value   specified   in   table   16-1   (the increase in current may be accomplished by any practical means;   for   example,   reactively   or using reduced voltage levels). NOTE The frequency shall be maintained    at    rated    conditions, the   load   current   shall   be   kept constant    and    the    load    current shall  be  balanced  equally  among the  phases.    Simultaneously  with the load current increase, start the stopwatch. (d) Record    all    load    instrumentations and  the  time,  in  seconds,  required for the circuit interrupter to operate. (e) The     generator     set     contains     an overload malfunction indicator, check and record its indication. (f) Allow  the  generator  set  to  cool  at rated   load   for   a   minimum   of   15 minutes. (g) Repeat  steps  (c)  through  (f)  except that the load current is increased to the overload current value in Phase A  only.    Phase  B  and  C  remain  at the rated load current value. (h) Repeat step (g) except that the load is increased to the overload current value  in  phase  B  only.    Phases  A and   C   remain   at   the   rated   load value of current. (i) Repeat step (g) except that the load is increased to the overload current value  in  phase  C  only.    Phases  A and   B   remain   at   the   rated   load value of current. d. Results.      The   data   sheets   shall   show,   as   a minimum,  whether  or  not  the  circuit  interrupter operated, the time(s) required for the interrupter to   operate,   the   indication   of   the   malfunction indicator,  the  overload  load  conditions  and  the stabilization data. Compare the time(s) requirements of table 16-1. 16-20.      CIRCUIT   INTERRUPTER   TEST   (OVERVOL- TAGE AND UNDERVOLTAGE). a. General.    To  protect  the  load  from  generator malfunction (for example, overvoltage or undervoltage)  a  circuit  interrupter  is  connected between    the    generator    voltage    reconnection system  and  the  generator  output  terminals.    A voltage    sensing    circuit    operates    the    circuit interrupter if an overvoltage or an undervoltage condition occurs and thus protects the load from a generator malfunction. b. Apparatus.          Instrumentation     for     measuring voltage and frequency shall be as described and illustrated in MIL-HDBK-705. Resistor(s), galvanometer matching networks, an oscillogram (as described and illustrated in MIL- HDBK-705,  Method  106.1,  paragraph  106.1.3) and    galvanometers    having    a    minimum    flat frequency  response  (flat  within  plus  or  minus  5 percent)  from  DC  to  3,000  Hz  and  the  voltage divider transformer network will be required. c. Procedure I (Overvoltage). (1) Preparation for test. (a) Locate    and    disconnect    the    input circuit  to  the  input  terminals  of  the overvoltage protective sensing circuit and connect the apparatus as illustrated  in  figure  512.3-I  for  one voltage connection. 16-16