2–24 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
ELECTRICAL INSTALLATION CHAPTER 2: INSTALLATION
Voltage Inputs
The 889 relays have four channels for AC voltage inputs, each with an isolating
transformer. Voltage transformers up to a maximum 5000:1 ratio may be used. The
nominal secondary voltage must be in the 10 to 240 V range.
The 889 supports wye and delta (or open delta) VT connections. The typical open delta VT
wiring diagram is shown in the following figure: Open Delta VT Connections. The typical
wye VT wiring diagram is shown in the figure: Typical Wiring diagram.
Figure 2-25: Open Delta VT Connections
AB C
X
X
AB C
VV V
V
V
VV V
J9
J10
J11
J12
J13
J14 J16
J15
VOLTAGE INPUTS
SLOT J
OPEN DELTA VT
CONNECTION
Phase A
Phase B
Phase C
SWITCHING DEVICE (52)
8-Series
MOTOR
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