2–4 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
INTRODUCTION CHAPTER 2: OVERVIEW
Table 2–1: 745 order codes
745 – * – * – * – * – * – * – *
Base unit 745 | | | | | | | 745 Transformer Protection System
Windings per
phase
W2 | | | | | | Two windings per phase
W3 | | | | | | Three windings per phase
Phase current
input ratings
P1|||||Winding 1 = 1 A, Winding 2 = 1 A, Winding 3 = 1 A
P5|||||Winding 1 = 5 A, Winding 2 = 5 A, Winding 3 = 5 A
P15 | | | | | Winding 1 = 1 A, Winding 2 = 5 A
P51 | | | | | Winding 1 = 5 A, Winding 2 = 1 A
P115 | | | | | Winding 1 = 1 A, Winding 2 = 1 A, Winding 3 = 5 A
P151 | | | | | Winding 1 = 1 A, Winding 2 = 5 A, Winding 3 = 1 A
P155 | | | | | Winding 1 = 1 A, Winding 2 = 5 A, Winding 3 = 5 A
P511 | | | | | Winding 1 = 5 A, Winding 2 = 1 A, Winding 3 = 1 A
P515 | | | | | Winding 1 = 5 A, Winding 2 = 1 A, Winding 3 = 5 A
P551 | | | | | Winding 1 = 5 A, Winding 2 = 5 A, Winding 3 = 1 A
Ground current
input ratings
G1 | | | | Winding 1/2 = 1 A, Winding 2/3 = 1 A
G5 | | | | Winding 1/2 = 5 A, Winding 2/3 = 5 A
G15 | | | | Winding 1/2 = 1 A, Winding 2/3 = 5 A
G51 | | | | Winding 1/2 = 5 A, Winding 2/3 = 1 A
Control power LO | | | 20 to 60 V DC; 20 to 48 V AC at 48 to 62 Hz
HI | | | 88 to 300 V DC; 70 to 265 V AC at 48 to 62 Hz
Options A | | Analog inputs/outputs
L | | Loss of life
R | | Restricted ground fault
Display/Ethernet B | Discontinued: Basic display
E | Enhanced display, larger LCD, two RS485 ports
T | Enhanced display, larger LCD, one RS485, Ethernet
Harsh environment H Harsh (chemical) environment conformal coating
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