1. With V1 and V2 set to Normal Voltage, i.e. 120 Volts each, and 60 Hz (for 60 hz relays) turn
outputs on by pressing the Start button.
2. The user selects V2 Angle and sets it to Ramp. Using the control knob, Ramp V2 phase
angle in the CW direction lagging the reference voltage. At some point a set of contacts may
open, thus allowing the user to determine the dropout angle (for example - 20°). The user
could set the starting angle of – 30 degrees for V2, thus the contacts would not be closed. If
we started the ramp at this point the angle would continue to 180 degrees. Then the sign
would change to +. When the relay Normally Open contacts closed we would read the closing
angle, i.e. + 20°. We would then compare the actual closing angle to that specified in the
Relay Setting Screen and calculate the error in degrees.
Advanced Closing Time Test:
This test is performed with Dynamic Enabled. To perform this
test let voltage channel 2, V2, provide the slip frequency (generator) and let voltage channel 1,
V1, provide the fixed voltage/frequency source (bus). This test will automatically determine
closing angle and advanced closing time for auto-synchronizing relays.
1.
Connect the relay's closing contacts to Timer Start Terminal 1 (first pair of Binary Input
terminals), so that when the relay contacts close (at the advance angle) it will start the
timer, and capture the closing angle at the same time.
2.
Set V1 to the Normal voltage output. Set V2 to the Normal output voltage and slip
frequency. For example:
VOLTAGE, 2, AC, 120, FREQ, 60.100
. V2 ANGLE display
should start at 0 degrees (we want V1 and V2 to turn on at 0 degrees together).
3.
Press the Start button. V2 will turn on in phase with V1, but will slip out of phase at the
selected slip frequency. At the advanced angle, based on the slip frequency, the relay will
close the breaker closing contacts, and start the timer. When the two voltages slip back
into phase the Timer will stop. The time indicated will be the advance time setting of the
relay. The associated closing angle will also be displayed. See the following figure for a
graphic representation.
As "S" approaches "F", at some point (the advance angle) the relay will send a close
signal, which will start the Timer. When "S" and "F" are in synchronous, the Timer will
stop. The time indicated on the timer display is the advance time of the relay based on
the preset slip frequency.
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