Table of Contents
Advertisement
I.L. 40-385.7
1.1.2.2
Blocking (BLK) Scheme
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
NOTE:
The pilot distance unit can be set at the forward (PLGF) and reverse (PLGR) directions.
Use Step 10 (a), (b), (c), and (d) in the Non-pilot Acceptance Tests to verify the accura-
cy if necessary.
Step 8.
NOTE:
The FDOG trip is determined by the IOM setting. It trips if 3I
ground directional unit picks up.
Step 9.
NOTE:
For Va = Vb = Vc = 0, Ia = Ib = Ic = 0, the setting of OSB = YES, WFEN = NO, and the
input of 52b = OV, the carrier SEND contacts will be closed. This is not desirable, but
occurs only on the test bench. If tested with the relay system, V = 0 and I = 0 mean that
the 52b input is at a rated voltage which will stop the SEND signal.
A-18
Change the STYP setting to BLK. Apply a rated dc voltage to RCVR #1 terminals
TB5/7(+) and TB5/8(-). Check the metering mode for RX1 = YES. Apply an AG fault
as shown in Step 10 of the Non-Pilot Acceptance Test (i.e., V
4 Amps). The trip A contacts should not be closed. The CARRY SEND should be
"open" and the CARRY STOP should be "closed".
Remove the dc voltage from RCVR #1 and apply AG fault. Trip A and RI2 (TB3/5
& 6 and TB3/7 & 8) contacts should be "closed" and the target should show "PLTG
AG". Set PTRI = NO. Repeat the test and the RI2 should not be closed.
Change the LED mode to "TEST" and select the "RS1" function. Push the ENTER
button; the ENTER LED should be "ON". Repeat Step 4 with the ENTER button de-
pressed. The relay should not trip.
Apply AG reversed fault (i.e., I
tacts should be "closed" and the CARRY STOP contacts should be "open". (I
should be > 3A for the setting of Z3GF = 6 and Z3GR = 0.01.)
Change the LED mode to TEST and select the function "TK". Push the ENTER but-
ton; the ENTER LED should be "ON" and the CARRY SEND contacts should be
closed.
In order to determine setting accuracy (6 ohms), the forward directional ground unit
must be disabled. Set FDGT = BLK. Repeat preceding Step 4 of the Pilot Accep-
tance Test, with a trip input current (I
Set the Forward Directional Ground Timer (FDGT) from 0 to 15 cycles. Repeat
Step 4 with I
= 1.5 A. The relay should be tripped after the delay time of FDGT.
a
In order to perform the Breaker Failure Reclose Block Test, change the setting of
FDGT = 0 and BFRB = NO. Repeat test Step 4; RB contacts (TB3/1 and TB3/2)
should not close. Change BFRB to YES and repeat the test. The RB contacts
should be closed with a time delay between 150 ms and 200 ms.
leads V
by 105 degrees). The CARRY SEND con-
a
a
) of 3 Amps (± 5%).
a
= 30 volts and I
a
>IOM and the forward
0
=
a
a
Advertisement
Chapters
Table of Contents
