Zone-3 Trip - ABB REL 301 Instruction Leaflet

If "T2Ø Type" and/or "T2G Type" are selected as "Torque Control" then Tables 3, 4 and 5
settings apply:
T2ø CV
and
T2G CV
2.3.3 Zone-3 Trip (Figure 2-7)
For Zone-3, phase faults, the Z3P ("Zone-3Ø") logic will identify faults in the forward or reverse
direction, depending on the "Zone-3" setting, and operate the Zone-3 phase timer T3P. The
Z3P output plus the T3P timer output satisfy AND 20 similar to zone-2. The AND 20 output pro-
vides TDT via OR 3. Signal TDT satisfies OR 4 (Figure 2-5) and operates the trip relay. Load
restriction, out of step blocking loss of potential and overcurrent supervision are similar to
zone-1. The tripping and targeting are similar to Zone-1 and Zone-2 trip, except for the Zone-3
phase time delay trip indicator Zone-3 Ø.
For Zone-3 single-phase-to-ground faults, Z3G identifies the fault and operates. Z3G, plus op-
eration of IOM, satisfies AND 7; operates T3G which provides the TDT signal via OR 3 with
Zone-3 ground time delay trip indicator delay trip indicator Zone-3 G. For security, the Z3G logic
is also supervised by the signal of FDOG, when Z3G is set forward or by the signal of RDOG
when Z3G is set reverse via logic OR 171B, AND 171C or AND 171D.
Operation for Zone-3 ØØG faults is similar to Zone-2, and is via OR 170, T3P and AND 20 gates.
The TDT signal is connected to the reclosing block logic.
The settings for Zone-3 timers (phase and ground) are independent, and as follows:
• T3P Zone-3 phase timer ("T3 Ø")
• T3G Zone-3 ground timer("T3 G")
Either Zone-3 phase or Zone-3 ground function(s) can be disabled by setting "Zone-3 Ø" and/or
"Zone-3 G" to the "Disabled" setting choice or by setting zone-3 phase and/or ground timers
to "Blocked".
Table 3:
C0-2; C0-5; C0-6; C0-7; C0-8; C0-9; C0-11
Reset or Instant
Table 4:
T2ø PkUp 0.50 to 10.00 Amps
and
T2G PkUp 0.50 to 10.00 Amps
Table 5:
T2ø TC 1- 63
and
T2G TC 1- 63
0.1 to 9.99 seconds or Blocked
0.1 to 9.99 seconds or Blocked
I.L. 40-386.4
2-5