Toshiba GRL100-701B Instruction Manual page 72

2.3.2.7 Phase Selection Logic
Every command protection has phase selection logic for single-phase tripping. Figure 2.3.2.9
gives details of the phase selection logic displayed in blocks in Figures 2.3.2.1 to 2.3.2.4.
Tripping command signal TRIP of each command protection can be classified by the phase
selection logic as a single-phase tripping command or a three-phase tripping command. If the
distance measuring element for earth fault Z3G (or Z2G depending on the setting of the scheme
switch [ZONESEL]) is operating when a TRIP is input, a single-phase tripping command S-TRIP
is output to the phase in which the phase selection element UVC is operating. If the UVC is
operating with two or more phases, a three-phase tripping command M-TRIP is output.
The undervoltage detection element UVLS, not shown in Figure 2.3.2.9, is used for the phase
selection logic as phase fault detector. The UVLS is also used for fault location.
If the distance measuring element for phase fault Z3S (or Z2S) is operating when a TRIP is input,
a three-phase tripping command M-TRIP is output.
608
UVC - A
609
UVC - B
610
UVC - C
566
Z3G - A
567
Z3G - B
568
Z3G - C
TRIP
581
Z3S - AB
582
Z3S - BC
583
Z3S - CA
Figure 2.3.2.9 Phase Selection Logic for Command Protection
2.3.2.8 Interface with Signaling Equipment
GRL100 interfaces with protection signaling equipment through binary input and output circuits
as shown in Figure 2.3.2.10.
Receiving command signals for remote terminal from the signaling equipment are input to
photo-coupler circuits BIn and BIm. BIn and BIm output signals R1-CR1 and R1-CR2 through
logic level inversion (NOT logic) circuit by PLC function (refer to Section 3.2.3).
A sending command signal CS to the signaling equipment should be output to the auxiliary relay
BOn through a logic level inversion circuit.
&
&
&
≥1
&
&
≥1
 71 
6 F 2 S 0 8 5 0
A
B
S - TRIP
C
&
≥1
&
&
≥1
M - TRIP