Toshiba GR200 Series Instruction Manual page 76

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are shown in Figure 2.1-30(b).

LESL and LESR for ZS

Figure 2.1-30 Load encroachment characteristic

The load encroachment element can operate for the command protection functions (ZCS

and ZCG elements) when the user sets Block for the scheme switches [ZCS-LEBlk] and [ZCG-

LEBlk]. We shall see the ZCS and ZCG functions later.

Fail safe function

Both ZS and ZG provide overcurrent elements, which can be used for fail-safe operation.

For example, an overcurrent element is provided in Z*S, termed Z*S-OCFS-EN. The

option of Z*S-OCFS-EN operation can be included when On is set for the scheme switch [Z*S-

OCFS-EN], the overcurrent element is subject to the setting of [OCF*S] in Z*S. The setting

value is chosen between 0.02–5.00 A (1 A rating) or 0.10–25.00 A (5 A rating).

Similarly, ZG is also provided with overcurrent elements for fail-safe operation. If On is

set for the scheme switch [Z*G-OCFS-EN], the overcurrent element is subject to the setting of

[OCF*G] in Z*G.

Definite time delay operation

In accordance with the location of the fault, the timing of trip signals can be adjusted with

delayed timers. For instance, a delay timer in Z*S tripping can be set by applying a time delay

setting using [TZ*S] whose value can be chosen between 0.00–100.00s. Similarly, for ZG

delayed timers can be applied using [TZ*G].

LEGL and LEGR for ZG

GRZ200 (Soft 031 & 032)

6F2S1915 (0.46)