Process Bus Modules - GE F60 Instruction Manual

3 HARDWARE
A relay configured for high impedance fault detection element includes two CT/VT modules: one type 8F, 8G, 8H, or 8J
module and one type 8Z module. For correct operation of the high impedance fault detection element, the ground current
terminals of the two CT modules must be connected to a ground current source, either a zero-sequence CT (see the Typi-
cal wiring diagram with high impedance fault detection earlier in this chapter) or, if a zero-sequence CT is not available, to
the neutral conductor of the phase CTs (see diagram below).
Figure 3–15: TYPICAL 8Z MODULE WIRING WITH PHASE CTS
The F60 can be ordered with a process bus interface module. This module is designed to interface with the GE Multilin
HardFiber system, allowing bidirectional IEC 61850 fiber optic communications with up to eight HardFiber merging units,
known as Bricks. The HardFiber system has been designed to integrate seamlessly with the existing UR-series applica-
tions, including protection functions, FlexLogic, metering, and communications.
The IEC 61850 process bus system offers the following benefits:
• Reduces labor associated with design, installation, and testing of protection and control applications using the F60 by
reducing the number of individual copper terminations
• Integrates seamlessly with existing F60 applications, since the IEC 61850 process bus interface module replaces the
traditional CT/VT modules
• Communicates using open standard IEC 61850 messaging
For additional details on the HardFiber system, see GE publication GEK-113658: HardFiber Process Bus System Instruc-
tion Manual.
GE Multilin F60 Feeder Protection System
3.2 WIRING

3.2.5 PROCESS BUS MODULES

3
3-13