Toshiba GR-200 Series Instruction Manual page 270

Multi functional protection ied

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Fault current

Unfaulted current

CO-OC element

Fault current

Unfaulted current

Fault current

Unfaulted current

pick-up and drop-off of fault current using an over current element (CO-OC) or an earth fault

element (OC-EF), which are arranged within the ARC function as shown in Figure 2.22-17.

The user must set the thresholds of the CO-OC and CO-EF relays using settings [CO-OC] and

[CO-EF], respectively. To engage the coordination feature, set the [ARCCO-OCEN] or [ARCCO-

EFEN] to On, the switches of which are shown in Figure 2.22-18.

Figure 2.22-17 Coordination of shot number performed

The matching of shot numbers is achieved by distinguishing a different duration for the

The CO-OC element detects the time duration between

the pick-up and drop-off of fault current so that the 'ARC

COORD' signal can be generated.

Consequently, ARC SHOT3 and ARC SHOT4

3rd and 4th tripping are not

are generated hypothetically.

6F2T0200 (0.15)

GRE200 (1,2)

Chapters

Gre200-1 Gre200-2