13-48 BE1-951 Testing and Maintenance 9328900990 Rev L
Step 6: Decrease the Auxiliary voltage input (VX) until OUT1 opens. Slowly increase the voltage until
OUT1 closes. Pickup should occur within ±2 percent of Delta V setting. Dropout should occur at
97% to 98% of actual pickup.
Step 7: Repeat Step 6 for the Line Voltage Input (VT Phase). Return voltage inputs to 120 vac, 50 or 60
hertz, 0 degrees.
Step 8: Swing the angle between voltage source 1 and 2 until the OUT1 opens. Slowly decrease the
angle until OUT1 closes. Pickup should occur within ±2 degrees of the Delta Angle setting on
the leading and lagging side of 0 degrees. Dropout should occur at 97% to 98% of actual
pickup. Return Delta Angle of 0 degrees.
Step 9: With the Auxiliary Voltage set at nominal frequency, step change the frequency of the Line
voltage input by -0.25 hertz (59.75 on a 60 hertz relay). Note that OUT1 is closing and opening
based on a slip rate of 0.25 hertz. Decrease the frequency until OUT1 stays open. Slowly
increase the frequency until OUT1 begins to cycle (closed/open). Cycling pickup should occur
within ±2 percent of the Delta Slip setting. Also check on the fast side (60.25 for a 60 hertz
relay).
Step 10: Repeat Step 9 for the Auxiliary Voltage input.
Step 11: (Optional.) Repeat Steps 4 through 10 for Setting Groups 1, 2, and 3.
Breaker Failure (BF)
Purpose: To verify the operation of the breaker failure (BF) function.
Reference Commands: SL-BF, SP-BF
Step 1: Prepare the BF function block for testing by transmitting the commands in
Table 13-71 to the
relay.
Table 13-71. BF Pickup Test Commands
Command Purpose
A= Gains write access.
SL-N=NONE Zero out custom logic settings. Overwrite with LOGIC=NONE settings.
Y Confirm overwrite.
SL-N=BF Sets BF as custom logic name.
SL-BF=1,IN4,/IN3 Enables BF, IN4 initiate, /IN3 block.
SP-BF=50m Set BF time delay at minimum.
SL-VO1=BFT Enables OUT1 to close for BF trip.
SL-VO2=BFPU Enables OUT2 to close for BF pickup.
SG-CT=1 Sets P, N CT ratio at 1:1
SG-TRIGGER=BFT,BFPU,0 Enable BFT to log and trigger fault recording.
EXIT;Y Exit and save settings.
Step 2: Energize relay inputs IN3 and IN4. This enables the BF logic and BF initiate. The BF current
detector pickup setting is a fixed value that is determined by the relay current sensing type.
Table 13-72 lists the pickup setting for each current sensing type.
Table 13-72. BF Current Detector Pickup Settings
Sensing Type Pickup Setting
A or B (1 A) 0.1 A
D, E, or F (5 A) 0.5 A
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