BECKWITH ELECTRIC M-3520, Instruction Book

Page: 152 / 217

Testing – 6
6–19
32 Directional Power, #1 or #2 (Line to Line)
VOLTAGE INPUTS : Configuration V2
CURRENT INPUTS : Configuration C1
TEST SETTINGS : Pickup P PU (–3.00 to +3.00)
Time Delay D Cycles (1 to 8160)
Programmed Outputs Z OUT (1 to 8)
Function 32 (#1 or #2) Disable
Functions 59, 59I, 60FL Disable
Functions 27, 79. 50, 51V Disable
■ ■ ■ ■ ■
NOTE : It would be efficient to disable the function with the lower pickup setting first and test the higher
setting operation. Since the lower setting operation can be tested without disabling the higher
setting, the 32 functions will be enabled when the tests are complete.
1. Disable functions as shown. See Section 3.2, Configure Relay Data, for procedure.
2. Confirm settings to be tested.
3. Connect inputs in Configuration V2 and C1 designated above. See Section 6.1, Equipment/Test
Setup for configurations.
4. The level of current at which operation is to be expected for an individual power setting is as follows:
Multiply the PU pickup value (
P above) by the Nominal Current ).
5. Set the three phase voltages to the Nominal Voltage .
6. Pickup Test – Over Power : Press and hold the TARGET/OUTPUT RESET pushbutton and slowly
increase the three phase currents ( for negative or reverse power flow direction the phase angle of the
phase currents are set at 180 degrees from the respective phase voltages). Increase the currents
until the
32 DIRECTIONAL POWER LED light goes on or the pickup indicator operates on the
Function Status screen. The level of operation will be equal to that calculated in step 4, & 0.02 PU
or
&
2%.
7. Pickup Test – Under Power : Press and hold the TARGET/OUTPUT RESET pushbutton. For
negative or reverse power flow direction, the phase angle of the phase currents are set at 180
degrees from the respective phase voltages. Start with a current calculated in Step 4, ±10%, then
slowly decrease the current until the
32 DIRECTIONAL POWER LED light goes on or the pickup
indicator operates on the Function Status screen.
8. Release the TARGET/OUTPUT RESET pushbutton and decrease the currents. Press TARGET/
OUTPUT RESET pushbutton to remove targets.
9. Time Test : With output contacts (Z) connected to stop the timer, apply approximately 110% of the
pickup current and start timing. The contacts will close after D cycles within ±2 cycles.
10. If testing is complete, enable any functions disabled for this test. If other tests are to be completed,
check the proper functions to disable for the next test and proceed from this configuration.