Toshiba GR-200 Series Instruction Manual page 140

Multi functional protection ied

Hide thumbs Also See for GR-200 Series:

Scheme logic

Figure 2.8-3 shows the scheme logic for the BCD function. The BCD function issues a trip

signal through a delayed pick-up timer, the value of which is set for [TBCD]. The operation of

the BCD function can be disabled using scheme switch [BCD-EN] Off.

800000EBB0 BCD_BLOCK

Figure 2.8-3 Broken conductor protection scheme logic

Normal power system levels of negative phase sequence restrict the setting value of

[BCD]. The BCD function continuously determines the ratio (I

present ratio along with the maximum value (I

ago. We recommend that user should distinguish the present ratio against the value on

commissioning stage; and user should set a value for [BCD] from 130% to 150% of the ratio has

been checked.

Note: The ratio (I

current) on the secondary circuit is larger than 2% of the rated current on

secondary circuit.

) is displayed only when the current in positive-sequence (or load

0.00 - 300.00s

max) that has been examined for 15 minutes

6F2T0200 (0.15)

To Recording

BCD-OPT-TRIP

BCD-OPT-ALARM

BCD-ARC-BLOCK

). The user can check the

GRE200 (1,2)

Chapters

Gre200-1 Gre200-2