Sel -751A Installation Manual
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Sel -751A Installation Manual

Feeder protection relay
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For Additional Technical Assistance Call +1.509.332.1890
Express Installation Guide
SEL-751A Feeder Protection Relay

Package Contents

Blank Pushbutton LED Label
Blank Target LED Label
Label Removal Tool
UP
UP
LEFT
198-0424
RIGHT
198–0424
®
Panel Cutout Template
Manual CD &
SEL
No. 8-32 Mounting Screws,
Configurable Label Kit
AC
ERATOR
QuickSet™ Software CD
Gasket, & Serial Port Cover
(if equipped)
1

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Summary of Contents for Sel SEL-751A

  • Page 1 For Additional Technical Assistance Call +1.509.332.1890 Express Installation Guide SEL-751A Feeder Protection Relay Package Contents Blank Pushbutton LED Label Blank Target LED Label Label Removal Tool LEFT 198-0424 RIGHT 198–0424 ® Panel Cutout Template Manual CD & No. 8-32 Mounting Screws,...
  • Page 2 TX– RX– SHIELD CURRENT INPUTS VOLTAGE INPUTS (Optional) ** SEL Fiber Optic Cables 240-1506 — 1 m (3.3 ft) ST/ST 240-1507 — 5 m (16.4 ft) ST/ST 240-1508 — 15 m (49.2 ft) ST/ST Other lengths available by request Feeder...
  • Page 3 Rack Mounting You should mount the SEL-751A in a sheltered indoor environment (a building or an enclosed cabinet) that does not exceed the temperature rating of –40°C to +85°C. For mounting consideration, the relay dimensions are shown below. New Control Center Step 1.
  • Page 4 Connections Shown for the SEL-751A with Ethernet, Fiber Optic, IRIG-B, EIA-232, 4 DO/3 DI/1 AO Option, 8 DI Option, and Voltage Option. Refer to the SEL-751A manual for additional details and other options. Wire sizes for connections are dictated by the terminal blocks and expected load currents. You may use the following table...
  • Page 5 Step 1. Connect Phase A, Phase B, Phase C current inputs to terminals 01, 02; terminals 03, 04; and terminals 05, 06, respectively, following the convention shown in the typical connections diagram. Step 2. Connect neutral current IN inputs to terminals 07, 08. Refer to Section 2 of the SEL-751A manual for additional details and other connection options.
  • Page 6 When properly implemented, this protection may, reduce incident energy exposure. The SEL-751A relay is equipped with four levels of phase instantaneous overcurrent elements (50P1, 50P2, etc.) that may be set and temporarily activated with a front panel pushbutton, to provide enhanced (faster and/or more sensitive) protection while ener- gized work is being done on downstream equipment.
  • Page 7 OK when prompted to upload the revised settings into relay. Step 4. The Operator Control label on the SEL-751A relay for pushbuttons PB01 through PB04 will need to be replaced, using the configurable label kit provided with the relay, with an Operator Control label that has pushbutton PB01 labeled as ARC FLASH PROTECTION, as shown in the adjacent figure.
  • Page 8 Machine Interface (HMI) on the front panel, remote communications, or a direct computer connection. For direct serial communica- tions, the computer must have a serial port (or USB port if using SEL-C662 USB cable) and the operating system should be Windows®...

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