2.13
Date Code 20080213 Instruction Manual SEL-351A Relay
Installation
Making Rear-Panel Connections
Current Transformer
Inputs
Model 0351A0W
The wiring harness includes a prewired eight-position CT shorting connector.
Note the polarity dots above terminals Z01, Z03, Z05, and Z07. Refer to
Figure 2.12–
Figure 2.25 for typical CT wiring examples.
Plug the CT shorting connector into terminals Z01–Z08. Secure the connector
to the relay chassis with the two screws located on either end of the connector.
When removing the CT shorting connector, pull it straight out away from the
rear panel. With the CT shorting connector removed from the rear panel,
internal mechanisms in the connector separately short out each individual
power system current transformer.
The connector accepts wire size AWG 16 to 10. A special tool is used at the
factory to attach the wire to the connector.
Refer to the serial number sticker on the relay rear panel for the nominal
current ratings (5 A or 1 A) for the phase (IA, IB, IC) and neutral (IN) current
inputs (listed under label: AMPS AC). The neutral (IN) current input also has the
0.05 A and 0.2 A nominal current options. The selection of the neutral current
input rating is often determined by the desired ground directional element (see
Table 4.1 and accompanying note).
Models 0351Ax0
Note the polarity dots above terminals Z01, Z03, Z05, and Z07. Refer to
Figure 2.12–Figure 2.25 for typical CT wiring examples.
Refer to the serial number sticker on the relay rear panel for the nominal
current ratings (5 A or 1 A) for the phase (IA, IB, IC) and neutral (IN) current
inputs (listed under label: AMPS AC). The neutral (IN) current input also has the
0.05 A and 0.2 A nominal current options. The selection of the neutral current
input rating is often determined by the desired ground directional element (see
Table 4.1 and accompanying note).
Potential Transformer
Inputs
Model 0351A0W
The PT wiring harness includes a prewired six-position connector. Plug the
connector into terminals Z09–Z14. The connector is keyed uniquely and locks
in place upon insertion.
Note the signal labels (VA, VB, VC, N, VS, NS) on terminals Z09–Z14. Figure 1.2
shows the internal connection for terminals VA, VB, VC, and N. Note also that
VS/NS is a separate single-phase voltage input.
Models 0351A00
Note the signal labels (VA, VB, VC, N, VS, NS) on terminals Z09–Z14. Figure 1.2
shows the internal connection for terminals VA, VB, VC, and N. Note also that
VS/NS is a separate single-phase voltage input.
Courtesy of NationalSwitchgear.com
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