GE B90 User Manual

CHAPTER 8: APPLICATION OF SETTINGS ZONING AND DYNAMIC BUS REPLICA
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 8-3
8
Figure 8-2: Approximate CT magnetizing characteristics
8.2 Zoning and dynamic bus replica
8.2.1 North bus zone
With reference to the following diagram, the North bus differential zone is bounded by the following CTs: CT-1, CT-2 (if S-1
closed), CT-3 (if S-3 closed), CT-4 (if S-5 closed), CT-5 and CT-8. The North bus protection is to operate the following
breakers: B-1, B-2 (if S-1 closed), B-3 (if S-3 closed), B-4 (if S-5 closed), B-5 and B-7.

GE B90 Specifications

General

Brand	GE
Model	B90
Category	Relays
Language	English