BE1-951
Testing and Maintenance
13-29
Table 13-32. 51/27R Settings
Operating Settings
Purpose
S0-51P=2.0,0,V2,N
Sets 51P PU at 2 amps, TD=0, Time Curve = V2, non-directional
S0-27R=100,C
Set 27R to 100 volts, 51P to Voltage Control
Step 3 Connect and apply 120 Vac, three-phase, 50 or 60-Hertz voltage source (depending on users
nominal frequency) to terminals C13 (A-phase), C14 (B-phase), C15 (C-phase) and C16 (Neutral).
Connect a variable ac current source to terminals D1 (A-phase polarity) and D2 (A-phase
non-polarity). Refer to Figure 13-1 for terminal locations.
Step 4 Apply 2 amps of A-phase current and slowly reduce A-phase voltage until OUT1 closes. Increase
A-phase voltage until OUT1 just drops out. Pickup will occur 2 percent or 1 volt of the of the
27R voltage setting. Dropout will occur at 102 to 103% or actual pickup.
Step 5 Repeat steps 2 and 3 for B-phase current (D3 and D4) while varying B-phase voltage, and C-phase
current (D5 and D6) while varying C-phase voltage.
Step 6 (Optional) Repeat Steps 2 through 5 for setting groups 1, 2, and 3.
51/27R-Voltage "Restraint" Pickup and Dropout Verification
Step 1 Using Table 13-33 as a guide, transmit the 51/27R setting commands to the relay.
Table 13-33. 51/27R Settings
Operating Settings
Purpose
S0-51P=2.0,0,V2,N
Sets 51P PU at 2 amps, TD=0, Time Curve = V2,
non-directional
S0-27R=100,R
Set 27R to 100 volts, 51P to Voltage Restraint
Step 2 Connect and apply 120 Vac, three-phase, 50 or 60-Hertz voltage source (depending on users
nominal frequency) to terminals C13 (A-phase), C14 (B-phase), C15 (C-phase) and C16 (Neutral).
Connect a variable ac current source to terminals D1 (A-phase polarity) and D2 (A-phase
non-polarity). Refer to Figure 13-1 for terminal locations.
Step 3 Adjust the A-phase voltage to to VR setting (100volts). Apply and slowly increase A-phase current
until OUT1 closes. Decrease A-phase current until OUT1 just drops out. Pickup will occur 2
percent of the 51P pickup setting. Dropout will occur at 93 to 97% of actual pickup.
Step 4 Adjust the A-phase voltage to 1/2 VR setting (50volts). Apply and slowly increase A-phase current
until OUT1 closes. Decrease A-phase current until OUT1 just drops out. Pickup will occur at 1/2 the
51P pickup setting (1 amp +2 percent). Dropout will occur at 93 to 97% of actual pickup. See
Instruction Manual Section 4,
Protection and Control, 51/27R feature, for a graphical explanation
of 51P Pickup Level Compensation.
Step 5 Repeat steps 2 and 3 for B-phase current (D3 and D4) while varying B-phase voltage, and C-phase
current (D5 and D6) while varying C-phase voltage.
Step 6 (Optional) Repeat Steps 1 through 5 for setting groups 1, 2, and 3.
Directional Overcurrent (67)
Purpose: To verify the operating accuracy of the 67 Directional Overcurrent function.
Reference Commands: SG-LINE, SL-50/51, S0-67, R.-STAT
Step 1 To prepare the 50TP,N, and Q elements for directional testing, transmit the commands in Table
13-34 to the relay. Reset Targets.
