Directional Earth Fault Protection - Toshiba GRL100-701B Instruction Manual

When operation of the DEFR and non-operation of the DEFF last for 20 ms or more, even if the
DEFF operates or the DEFR is reset later, tripping of the local terminal is blocked for the TREBK
setting time and transmission of the trip block signal continues for the TSBCT setting time.
When the signaling channel of DEF BOP is separated from that of distance command protection,
the signal S-DEFBOP2 is used for CS and assigned to a user configurable binary output relay (see
Section 3.2.2.).
Setting
The following setting is required for the DEF command protection:
Element Range
DEFF
DEFFI 0.5 - 5.0 A
(0.10 - 1.00 A
DEFFV 1.7 – 21.0 V
TDEFC 0.00 - 0.30 s
DEFR
DEFRI 0.5 - 5.0 A
(0.10 - 1.00 A
DEFRV 1.7 – 21.0 V
TDERC 0.00 - 0.30 s
DEF θ 0 - 90°
TCHD 0-50 ms
TREBK 0.00 - 10.00s
TSBCT 0.00 - 1.00s
TECCB 0.00 – 200.00s
CRSCM PUP/POP/UOP/ BOP
DISCR OFF/ON
DEFCR OFF/ON
ZONESEL Z2/Z3
ECHO OFF/ON
WKIT OFF/ON
CH-DEF CH1/CH2
(*) Current values shown in the parentheses are in the case of 1 A rating. Other current values are in
the case of 5 A rating.
When the DEFF at the remote end operates, the local DEFR must always operate for reverse faults.
The setting levels of the residual current and residual voltage for the DEFR must be lower than that
for the DEFF.
2.4.2

Directional Earth Fault Protection

The scheme logic is shown in Figure 2.4.1.
The directional inverse or definite time earth fault protection as backup protection executes
three-phase final tripping. The forward looking DEFF or reverse looking DEFR can be selected.
The directional inverse and definite time earth fault protections are available to trip
instantaneously by binary input DEF∗_INST-TRIP except for [DEF∗EN]= "OFF" setting.
In order to give priority to the distance protection, the directional earth fault protection enables
inverse time or definite time delayed tripping by the scheme switch [DEF∗EN].
Step Default
0.1 A 1.0 A
0.01 A 0.2 A) (*)
0.1 V 2.0 V
0.01 s 0.15 s
0.1 A 1.0 A
0.01 A 0.20 A)
0.1 V 2.0 V
0.01 s 0.15 s
1° 85°
1 ms 12 ms
0.01s 0.10s
0.01s 0.10s
0.01s 0.10
POP
OFF
OFF
Z2
OFF
OFF
CH1
 81 
6 F 2 S 0 8 5 0
Remarks
Forward looking DEF
Residual current
Residual voltage
DEF carrier trip delay timer
Reverse looking DEF
Residual current
Residual voltage
DEF carrier trip delay timer
Characteristic angle
Coordination timer
Current reversal blocking timer
SBCNT timer
ECHO enable timer from CB opened
Scheme selection
Distance carrier protection enable
DEF carrier protection enable
Carrier control element
ECHO carrier send
Weak infeed carrier trip
DEF carrier channel setting