Toshiba GR200 Series Instruction Manual page 144

Line differential protection ied

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DISTANCE COMMON

PSBG F.RESET

Setting for blocking operation of Distance protection

Scheme switches [Z*S-PSBBlk] and [Z*G-PSBBlk] are provided to block the operation of the

respective Z*S and Z*G elements. Generally, it is desirable to block the operation of the

respective ZS elements and ZG elements during a power swing. Thus, Block is set for the

respective scheme switches [Z*S-PSBBlk] and [Z*G-PSBBlk].

However, when it is required to continue the operation of respective ZS and ZG elements

during a power swing, Non is set for respective scheme switches.

Load encroachment

The load encroachment element is used to improve security when heavy load current flows in

a line. When the impedance remains within the hatched area as shown in Figure 2.10-30, a

signal that reflects the operation of the load encroachment element is yielded; respective ZS

elements are blocked to operate by blocking signals, which can be issued at which Block is set

for the scheme switches [Z*S-LEBlk].

As shown in Figure 2.10-30(a), for ZS the minimum load resistance R is defined by the

setting of scheme switches [LESR] and [LESL]. Setting of the maximum load angles across the

R ordinate is performed using scheme switches [LESR-Angle] and [LESL-Angle].

For ZG, when Block is set for the scheme switches [Z*G-LEBlk], similar settings and

scheme switches are available: settings [LEGR], [LEGL], [LEGR-Angle], and [LEGL-Angle],

Figure 2.10-29 PSBG logic

0.02 to 0.100s

0.0 to 10.00s

6F2S1914 (0.49)

To VTF and CTF

PSBG-CVTF-BLK

GRL200 (Soft 033 & 037)

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