Toshiba GR-200 Series Instruction Manual page 91

Multi functional protection ied

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Operation zone

Directional characteristic

Operation zone

Figure 2.4-2 Examples of directional characteristic angle (θ)

Characteristic of directional SEF in the reverse direction

The reverse characteristic is a mirror image of the forward characteristic. The setting and the

scheme switch, in addition to providing the setting of the directional SEF element in the

forward direction, provides the setting of the directional SEF element in the reverse direction:

for example, Reverse should be set for the scheme switch [SEF1-Dir] when the direction of the

SEF element for stage 1 is considered.

Inverse time and definite time delay characteristic

The SEF element monitors the currents. When one of the currents cross the threshold of

operation, the SEF element operates in a period that is defined by the time characteristic

feature. The user can choose the SEF operate time delay characteristics, either dependent

(inverse) time characteristic delay (IDMT; e.g., IEC-NI, UK-LTI, IEEE-MI, etc.) or independent

(definite) time characteristic delay (i.e., DT). The IDMT operate time depends upon the level

of the energizing current, but the DT operate time is a constant.

For the reset time delay of IDMT characteristics, either inverse (dependent)-time-

reset (i.e., DEP) or definite(independent)-time-reset (i.e., DEF) can be characterized by the

The user can select which characteristic will be applied to each stage of the SEF

element by setting a scheme switch that will be explained later in this section.

Operation zone

Operation zone

Directional characteristic

Operation zone

Operation zone

Operation zone

Directional characteristic

Operation zone

6F2T0200 (0.15)

Directional characteristic

Operation zone

Operation zone

Directional characteristic

GRE200 (1,2)

Chapters

Gre200-1 Gre200-2