Vt Fuse Failure - GE 845 Instruction Manual

CONTROL

VT Fuse Failure

4–316
Figure 4-136: Synchrocheck logic diagram
The 845 relay provides one VT Fuse Failure. The VT Fuse Failure detector can be used to
raise an alarm and/or block elements that may operate incorrectly for a full or partial loss
of AC potential caused by one or more blown fuses. Some elements that might be blocked
(via the BLOCK input) are voltage restrained overcurrent, directional current, power
functions. This loss can be caused by a blown primary voltage transformer fuse (or fuses),
or by voltage transformer secondary circuit protection fuse failure.
There are two classes of fuse failure that may occur:
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS