Schweitzer Engineering Laboratories SEL-351-5 - Current Transformer Inputs; Model 0351 Xy; Models 0351 X0 and 0351 X1; Potential Transformer Inputs

2-10 Installation Date Code 20020426
SEL-351-5, -6, -7 Instruction Manual
Refer to the serial number sticker on the relay rear panel for the optoisolated input voltage rating
(listed under label: LOGIC INPUT).
Current Transformer Inputs
Model 0351xY
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 2.10 through Figure 2.23 for
typical CT wiring examples.
Plug the CT shorting connector into terminals Z01 through 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 0351x0 and 0351x1
Note the polarity dots above terminals Z01, Z03, Z05, and Z07. Refer to Figure 2.10 through
Figure 2.23 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 0351xY
The PT wiring harness includes a prewired six-position connector. Plug the connector into
terminals Z09 through 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 through 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.