3.8.2.2 The Reach Test Setting Screen
The impedance test settings screen will establish and run a test using factory defaults or
manufacturer’s recommended values, if entered.
Figure 32 Reach Test Setting Screen
•
The Pre-fault Settings button sets the necessary pre-fault conditions for relay testing.
•
The Relay Settings button will allow the entry of relay setting values to test and evaluate the
relay.
•
When the current lags the voltage using 0
°
to 359.9
°
, the message “lagging
xxx.x
Degree” is
used. Otherwise, no message is required when using
±
180
°
.
•
The Fault Type determines the kind of fault tested. The accepted values are AG, BG, CG,
AB, BC, CA and ABC (Note: A, B, and C are the phases and G is ground).
•
The test entry has two possible selections: Ramp and Pulse Ramp. The selection of the
Ramp test will not use all the entries for pulse time. The ramp test changes the V/I Generator
output without re-applying the pre-fault conditions. Pulse Ramp uses all screen values.
•
The Pulse Time is the length of time the fault value will be applied. The range is from 1to
9999 cycles.
•
The Delay Time is the cumulative of fault and fault recovery times with a range of 1 to 9999
cycles.
Note: The Pulse Time must be less than Delay Time.
•
The channel selection default condition enables all Voltage and Current Generators. This is
indicated by a check mark in each of the generators selection area.
•
The voltage or current may be held. If Voltage is held the Start, Stop, and Increment values
will need to be expressed in Amps. If Current is held the Start, Stop and Increment values
will need to be expressed in Volts. The Increment value is used to increase the fault values
from the start to stop. The Start value is the beginning value for the output ramp. The limit for
the MPRT 8415 unit is 15 amps RMS. The limit for the MPRT 8430 unit is 30 amps RMS.
The Stop value is the upper limit of the ramp. The two values should be checked to ensure
the Stop value is greater than the Start value if ramping current up.
52
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