Table of Contents
Advertisement
I.L. 40-385.7
sors which are compared are I
The three-phase fault detection of Zone-1 and pilot are supervised by FDOPA & FDOPB &
FDOPC. The high set currents I
respectively.
3.4.13 Instantaneous Reverse Directional Overcurrent Ground Function (RDOG)
Similar to FDOG, the instantaneous reverse directional overcurrent ground function (RDOG)
supervises the ground units to prevent false trip.
3.4.14 Programmable Reclosing Initiation and Reclose Block
The REL300 system provides the following contact output for Reclosing Initiation and reclosing
block functions (see Figure 3-19):
• RI1, used for Reclosing Initiation on single pole trip
• RI2, used for Reclosing Initiation on 3-pole trip
• RB, used for Reclosing Block
The operation of RI1, RI2 and RB contacts is controlled by the setting of the programmable Re-
closing Initiation logic (as shown in Figure 3-19, page 3-41). The operation of either RI1, RI2,
or RB must be confirmed by the signal of TRSL, which is the trip output of REL300 operation.
The External Pilot Enable Switch (see Figure 4-1, TB-5 terminals 9 and 10), is used for enabling
the pilot system externally. The PLT setting is similar to the external pilot enable switch, except
it is set from the front panel (or remotely set via communication chain).
The most popular reclosing Initiation practice is to have reclosing initiation on high speed (pilot,
Zone 1 and high set) trip only. Programming can be accomplished by closing the pilot enable
switch and setting the PTRI and Z1RI to YES (see Figure 3-19). AND-84 will produce logic to
operate the RI2 relay when receiving signals from TRSL and AND-89 and no signal from RB
logic. The program is further controlled by the TTYP setting: TTYP setting OFF: 3PRN pro-
vides no output, therefore, will not operate RI2.
TTYP setting 1PR:
TTYP setting 2PR:
TTYP setting 3PR:
The PTRI, Z1RI, Z2RI and Z3RI settings are provided for programming on applications where
the Reclosing Initiation on pilot, Zone 1, Zone 2 or Zone 3 trip is desired. Logic AND-62A is
controlled by the signal of 3PRN, therefore, the setting of 1PR, 2PR and 3PR also affect the
Z1RI, Z2RI and Z3RI.
In general, the Reclosing Block (RB) relay will operate on TDT (Time Delay Trip) or OSB (Out-
of-Step Block condition). However, it will be disabled by the setting of Z1RI, Z2RI, and Z3RI
signal.
3-12
and V
(FDOPA), I
A
BA
, I
, I
are supervised by FDOPA, FDOPB and FDOPC,
AH
BH
CH
3PRN will provide output "1" on single-phase-to-ground fault only and
will operate RI2.
3PRN will provide output "1" on single-phase-to-ground fault or 2-phase
faults, and will operate RI2.
3PRN will provide output "1" on any type of fault, and will operate RI2.
and V
(FDOPB), I
B
CB
C
and V
(FDOPC).
AC
Advertisement
Chapters
Table of Contents
