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Related Manuals for Littelfuse AF0100
Summary of Contents for Littelfuse AF0100
- Page 1 AF0100 ARC-FLASH RELAY GENERATOR APPLICATION GUIDE...
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Page 2: Table Of Contents
Documentation ................................4 Method to Reduce Clearing Time ..........................4 ANSI Z10 : RISK CONTROL HIERARCHY ........................4 Background ..................................4 Methods ..................................4 GENERATOR PROTECTION USING AF0100 ........................5 Generator To Generator Breaker Connection ........................5 Transformer Enclosure ..............................5 AF0100 CONNECTION DIAGRAM ..........................6 SENSOR COVERAGE ..............................7 EFFECT OF GENERATOR GROUNDING ON ARC-FLASH RISK .................8... -
Page 3: Generators
AF0100 Arc-Flash Relay GENERATOR APPLICATION GUIDE GENERATORS Generators are often used to ensure continuity of energy for mission-critical applications. There are five key reasons generators are vulnerable to arc flash and this guide explains how to mitigate this risk. The high levels of energy from the generator and low impedance (due to being near the energy source) put the generator at risk. -
Page 4: Nec ® Article 240.87 (2017)
AF0100 Arc-Flash Relay GENERATOR APPLICATION GUIDE ARTICLE 240.87 (2017) ® Arc-Energy Reduction Where the highest continuous current trip setting for which the actual overcurrent device installed in a circuit breaker is rated or can be adjusted is 1200 A or higher, 240.87(A) and (B) shall apply. -
Page 5: Generator Protection Using Af0100
The AF0100 was specifically designed for generator applications, with two isolated Form-C trip outputs to cut off all sources of energy from the arc. A 24-48 Vdc supply allows for power directly from the battery bank and withstands voltage sags and overvoltages, and the entire relay is designed to withstand vibration. -
Page 6: Af0100 Connection Diagram
The AF0100 includes two Form-C Trip outputs that quickly respond to an arc flash, turning off the generator using the AVR or other control circuits and disconnecting from the utility or parallel generators by tripping the generator breaker. -
Page 7: Sensor Coverage
AF0100 Arc-Flash Relay GENERATOR APPLICATION GUIDE SENSOR COVERAGE ( Distance where a line-of-sight arc will be detected) Point Light Sensor Line-of-sight light sensor detects an arc as small as 3 kA in a 2-meter half-sphere radius. § Visual LED indication for “Ready” or “Tripped”... -
Page 8: Effect Of Generator Grounding On Arc-Flash Risk
The Littelfuse SE-701 Ground-Fault Relay can monitor for a wide range of current levels and works with any 5-A or 1-A secondary as well as sensitive Littelfuse CTs for detection down to 50 mA. For applications where there is not sufficient space for a CT, the PGR-4300 Ground-Fault Relay connects between the generator and grounding rod to detect ground-fault currents from 100 A to 1200 A. -
Page 9: Advantages Of Resistance Grounding For Generators
AF0100 Arc-Flash Relay GENERATOR APPLICATION GUIDE ADVANTAGES OF RESISTANCE GROUNDING FOR GENERATORS Generator ground-fault current can be higher than short-circuit current for solidly grounded generators. High-resistance grounding can eliminate the possibility of phase-to-ground arc flash on the first ground fault. -
Page 10: Benefits To Adding Arc-Flash Relays
§ Challenge Littelfuse AF0100 Benefit Available space limitations AF0100 measures 90 mm (3.5”) x 128 mm (5.0”) x 60 mm (2.4”) Two sources of energy must be disconnected: Two isolated Form-C Trip outputs: The generator Trip the generator breaker and disconnect from bus... -
Page 11: Appendix A: Supporting Materials
AF0100 Arc-Flash Relay GENERATOR APPLICATION GUIDE APPENDIX A: SUPPORTING MATERIALS Littelfuse provides many supporting materials in digital format for the function and installation of the AF0100 Arc-Flash Relay. Manual Brochure Workbook for Estimating Arc-Flash Incident Energy Reduction Datasheet Videos FAQ Booklet Guideform Specifications These can be found at: Littelfuse.com/ArcFlash... - Page 12 Littelfuse.com/ArcFlash Additional technical information and application data for Littelfuse protection relays, generator and engine controls, fuses and other circuit protection and safety products can be found on Littelfuse.com. For questions, contact our Technical Support Group (800-832-3873). Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of publication, but are subject to changes without notice.