Chapter 2 Installation
8
2.2 Electrical Installation
2.2.1
Power Source Connection
The SA300 unit has two independent power supplies: main and backup. The standard power supplies may be
connected to an 85-265V AC or 88-290V DC power source. Lower voltage DC power supply options are also
available (see
Appendix: Technical Specifications
).
The main power supply connections are:
AC power: line to terminal J10 5; neutral to terminal J10 6.
DC power: positive to terminal J10 5; negative to terminal J10 6.
The backup power supply connections:
AC power: line to terminal J10 3; neutral to terminal J10 4.
DC power: positive to terminal J10 3; negative to terminal J10 4.
Copper wiring 1.5-2.5 mm
2
(15 -13 AWG) should be used.
2.2.2
Current Inputs
SA310 and SA320 models have 4 current inputs up to 150A, connected to Relay Protection CT’s via J12
connector. Copper wiring 2.5 – 6 mm
2
(10 AWG) should be used.
SA330 model has 4 additional current inputs up to 20A (ANSI) or 10A (IEC), connected to metering CTs via J14
connector. Copper wiring 1.5 – 3.5 mm
2
(12 AWG) should be used.
2.2.3
Ground
Connect the chassis ground of the
SA300
to the switchgear earth ground using dedicated wire greater than 2
mm
2
/14 AWG.
2.2.4
Voltage Inputs
SA300 models have 3 AC Y-connected voltage inputs of 690V (phase-to-phase) and neutral, and one separate
isolated AC voltage input of 400V.
2.2.5
Wiring Configurations
For models SA310, SA320, use any of the seven wiring configurations shown in Figures 2-3, 2-4, 2-5, 2-6, 2-7,
2-8 or 2-9; for model SA330, use any of the four wiring configurations shown in Figures 2-5a, 2-6a, 2-7a or 2-
8a.
Wiring Configuration
Wiring
(See parameter setup instructions in Section 4.1)
Model Code
for
Setup
See Figure:
3-wire direct connection using 2 CTs (2-element)
SA310, SA320
3dir2
2-3
4-wire WYE direct connection using 4 CTs (3-element)
SA310, SA320
4Ln4 or 4LL4
2-4
4-wire WYE connection using 3 PTs, 3 CTs (3-element)
SA310, SA320
4Ln3 or 4LL3
2-5
4-wire WYE connection using 3 PTs, 3 CTs (3-element)
SA330
4Ln3 or 4LL3
2-5a
3-wire open delta connection using 2 PTs, 2 CTs (2-
element)
SA310, SA320
3OP2
2-6
3-wire open delta connection using 2 PTs, 2 CTs (2-
element)
SA330 3OP2
2-6a
4-wire WYE connection using 2 PTs, 3 CTs (2½-element)
SA310, SA320
3Ln3 or3LL3
2-7
4-wire WYE connection using 2 PTs, 3 CTs (2½-element)
SA330
3Ln3 or3LL3
2-7a
3-wire open delta connection using 2 PTs, 3 CTs (2½ -
element)
SA310, SA320
3OP3
2-8
3-wire open delta connection using 2 PTs, 3 CTs (2½ -
element)
SA330 3OP3
2-8a
4-wire delta direct connection using 3 CTs (3-element)
SA310, SA320
4Ln3 or 4LL3
2-9
