35
IMPEDANCE RELAY:
The IMPEDANCE RELAY Test Screen is used to test all single-phase distance,
impedance, or three-phase impedance relays (where the voltages may be paralleled
and currents series). From the
TEST MENU
Screen, select
IMPEDANCE RELAY
. The
following test screen should be displayed.
Connect Relay Trip contacts to
STOP/MONITOR
gate.
Connect
AC CURRENT MAIN
to current coil or input (note polarity).
Connect
DC AUX
output to relay (for solid state or microprocessor-based).
Connect
AC AUX
output terminals to the relay potential coil or input (note polarity).
Note: If relay is solid state, or microprocessor-based, and requires a DC logic voltage
prior to applying test, connect the relay dc power terminals to the
DC AUX
terminals.
With the arrow key, highlight the
DC VOLTS
and press the
DC
Button. Increase the DC
voltage output by rotating the Control Knob until proper logic voltage is applied.
OHM Pick up or Reach Test:
1. Press
the
OHM SELECT
Button and select the desired formula for calculating
the OHM pick up or Reach value.
2.
Using the arrow key, highlight the
AC VOLTS
. Press the
AC AUX
button to turn
the AC Volts on.
3.
Rotate Control Knob and increase AC Voltage output to the desired test voltage.
4.
Using the arrow key, highlight the
AC AMPERES
.
5. With
MODE SELECT
set to
MAINT.
(MAINTAIN), press the
INIT
button.
6.
Rotate Control Knob and increase current until the desired test current is set.
Note the phase angle displayed,
φ
I lags V
. The relay may be tripped at this
point depending on the measured phase angle displayed.
7.
Using the arrow key, highlight the phase angle displayed. Using the Control
Summary of Contents for SR-98
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