19
DC VOLTS ( 00.0 V ):
The value displayed is the measured output voltage from the DC
AUX output terminals. The voltage value displayed in the ( 00.0 V ) is the estimated
output for the selected output terminal. The actual output voltage may vary slightly
depending on the actual load. This allows the operator to preset a voltage output
without turning the voltage on. When rotating the Control Knob, the voltage value
changes up or down depending on the direction of rotation.
SEC / CYCLES:
The time displayed in the
SEC
(seconds) display area is the operating
time of the device under test in seconds. The value displayed in the
CYCLES
display
area is the operating time in cycles based normally on either a 60 Hz or 50 Hz time
base. The time base depends on the base frequency set in the
Timer Setup Screen
(see Timer Setup Screen for details on Frequency changes).
FAULT VOLTS (AC):
The value displayed is the measured output voltage from the AC
AUX output terminals. The “fault” voltage is set first. Then the “normal” is set and
displayed on the AC VOLTS display. When the test is initiated, the normal voltage is
removed and the fault is applied. The timer is started when the fault voltage is applied.
When the relay trips, the timer stops and the output is turned off.
POWER RELAY Test Screen:
The POWER RELAY Test Screen is used to test over power, reverse power or
synchronous motor loss of excitation relays. Many of the same measured values seen
in the OVERCURRENT RELAY Test Screen are in the POWER RELAY Test Screen
(see descriptions in the OVERCURRENT RELAY Test Screen). The two primary
differences are the
WATTS
and Phase Angle,
φ
I lags V
,
displays.
The
WATTS
displayed is the calculated value based on the displayed formula, directly
beneath
(W)
= Watts. The three formulas available are
(W)
(VI*COS
∅
),
(W*1.7)
(Watts
* Square Root 3) and
(W/1.7)
(Watts/Square Root 3). The formula is selected by
pressing the
WATT SELECT
function button. These three formulas cover virtually all
single-phase power, and some three-phase power and loss of field relays.
The
φ
I lags V
phase angle display is the measured phase angle between the
AC
CURRENT MAIN
output and the
AC AUX
Output. It displays
Current lagging Voltage
.
Содержание SR-98
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