GE Masoneilan 469 Series, Инструкция по эксплуатации

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CHAPTER 3: INSTALLATION
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 3–17
FIGURE 3–18: Summation Method with Phase CTs
FIGURE 3–19: Summation Method without Phase CTs (Phase CTs wiring is shown in Figure 3-12)
3.2.5 Voltage Inputs
The 469 has three channels for AC voltage inputs, each with an isolating transformer. There
are no internal fuses or ground connections on the voltage inputs. The maximum VT ratio is
300.00:1. The two VT connections are open delta (see FIGURE 3–12:
Typical Wiring Diagram
on page 3–11) or wye (see below). The voltage channels are connected in wye internally,
which means that the jumper shown on the delta-source connection of the typical wiring
diagram, between the phase B input and the 469 neutral terminal, must be installed for
open delta VTs.
C
B
A
COM
GROUND
CURRENT INPUTS
PHASE C
1A/5A 1A/5A COM
PHASE A
COM 1A/5A
PHASE B
1A/5A
GROUND
COM COM
DIFFERENTIAL INPUTS
PHASE A
COM 1A/5A COM 1A/5A
PHASE B
806846A3.DWG
COM 1A/5A
PHASE C
H10 G8 G6 H6 G7 H7 H8 G9 H9 G10
PHASE C CT
PHASE A CT
PHASE B CT
MOTOR
H3 G3 G4 H4 G5 H5
PHASE B CT
DIFF.
PHASE A CT
PHASE C CT
DIFF.
DIFF.
50:.025