Toshiba GRB200 Instruction Manual page 12

Protection zones and Bay structure
(iii)
A Bay structure has been arranged with the setting [BayDevice_CH*] so that a DIF zone
calculation (ZoneA/B/C/D/E/F) can be corresponded with a protection zone (Zone1/2/3/R1) on
one-to-one basis in each CH. Table 2.1-4 shows the settings for zones and structures; they are
provided in each CH. The setting meanings are described below.
Setting items
Zone1_CH*
Non / ZoneA /
Zone2_CH*
ZoneB / ZoneC /
Zone3_CH*
ZoneD / ZoneE /
ZoneR1_CH*
Zone-NoDIF_CH*
CB_CH*
DS11_CH*
Non / NO / NC /
DS12_CH*
Both / DirConn
DS13_CH*
DS21_CH*
Line1_CH*
Line2_CH* Non / Exist
Line3_CH*
CT-POS_CH* POS1 / POS2
ZACbyCB_CH*
Settings [Zone1_CH*], [Zone2_CH*], and [Zone3_CH*]

Using these settings [Zone_CH*], the forward-looking protection is available by choosing
a zone among ZoneA to ZoneF (Non must be set when it is unused). They are available for
feeder, coupler, and end-section (see (iii)-1, (iii)-2, and (iii)-3 ).
Setting [ZoneR1_CH*]

The revers-looking protection is available when a CH is positioned on a coupler (see (iii)-
2). The CH can have bi-directional protection zones with the settings [Zone_CH*].
Setting [Zone-NoDIF_CH*]

The setting [Zone-NoDIF_CH*] allows the DIF calculation not to take the CH current
information from the CH if required. Figure 2.1-7 illustrates that the DIF calculation will
not take CH2 information by this (setting [Zone-NoDIF_CH2]=ZoneC). The figure shows
that the busbar has a transfer bus (i.e., ZoneC). The CH2 stands at the edge of the
protection zone such that ZoneB or ZoneC will be protected. However, CH5, designed to
protect ZoneA and ZoneB, does not stand at the opposite of the CH2. In other words, the
Table 2.1-4 Setting items in Bay structure
Range Unit
Forward 1st protection zone definition
Forward 2nd protection zone definition
– Forward 3rd protection zone definition
Reverse 1st protection zone definition
ZoneF
CH's current is unused in DIF zone calculation.
CB definition
DS11 definition
– DS12 definition
DS13 definition
DS21 definition
Line1 definition
– Line2 definition
Line3 definition
– CT position
Off / On – 'Zero-ampere' controlled with CB condition
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6F2S1923 (0.03)
Contents
GRB200C (Replica)
Default
Non
Non
Non
Non
Non
Non
Non
Non
Non
Non
Non
Non
Non
POS1
Off