O P E R A T O R M A N U A L
8
H I G H V O L T A G E - R A I S E / L O W E R
The RAISE/LOWER control adjusts the output voltage by raising or lowering the motorized output control
variable transformer. The OUTPUT PERCENT meter above the RAISE/LOWER control indicates the
relative position of the variable transformer with respect to the output voltage. An automatic return to zero
function at time of high voltage off ensures energizing of high voltage at zero. The control must be at
ZERO (0) to energize the high voltage circuits. The output control must always be returned to zero at
the completion of testing, prior to de-energizing the output , allow the unit to cycle for 60 seconds
to assure full discharge of the capacitance in the load.
V O L T M E T E R
The KILOVOLT METER allows for accurate output voltage readings. 1-% precision resistors minimize
the need for re-calibration due to aging shift. See Voltmeter Re-calibration in Section 3 for details on
calibration.
C U R R E N T / C A P A C I T A N C E M E T E R
The CURRENT/CAPACITANCE METER allows for output current readings. The CURRENT meter
portion of this circuit is for observing the charge and discharge currents in the cable load. 1-% precision
resistors minimize the need for re-calibration due to aging shift. The CAPACITANCE scale on this meter
is for measuring the load cable capacitance prior to test to determine the best operating frequency for
that particular cable run.
S C O P E O U P U T
The SCOPE OUTPUT allows for accurate output voltage monitoring. This connector can be fed into an
oscilloscope for the looking at the actual output wave shape. The peak voltage representing 50 kVac is 5
volts peak.
O U T P U T F R E Q U E N C Y
The OUTPUT FREQUENCY switch adjusts between calibrated frequencies for testing loads larger than
normal .By allowing slower frequencies the output waveshape is maintained. Output frequency choices
are .1 Hz for 5.0
µ
F, .05 Hz for 10
µ
F, .02 Hz for 25
µ
F, and .01 for 50
µ
F load capacitances.
O U T P U T M O D E
The OUTPUT MODE is for choosing the operating mode of the overloads. When this control is in the
HIPOT mode, the overload will trip in case of an arc. When in the BURN mode, the overload is still
active. But, if an arc occurs, a reactor is switched into the primary line to limit primary current to the
maximum rating for the unit allowing the faulted cable to be burned to a low impedance fault. After a short
is burned into the cable, conventional fault locating techniques can be employed.
