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What is an HEFPD and why is it needed?

Railroad systems are increasingly required to operate in common corridors with power transmission and distribution lines, presenting Communications & Signaling equipment protection challenges. Damaging AC faults caused by failure of power utility equipment on overhead power lines present high-energy, long-duration events that typical lightning surge protective devices are not capable of withstanding. These events pose a risk to track-connected signaling and crossing warning systems as well as other protective equipment.

Dairyland’s Overwatch HEFPD is a new class of device for railroad systems, designed using our decades of experience in high-energy applications. Designed with Dairyland’s proven solid-state technology, Overwatch can withstand the powerful, long-duration events caused by AC faults, keeping sensitive track-connected equipment protected. Overwatch is rated up to 4000 amps for a 12 cycle (0.2 second) duration AC fault event as defined in AREMA Communications & Signals Manual Part 11.3.7, while also meeting the applicable requirements of primary surge protection as defined in Part 11.3.1.

   ADDITIONAL RESOURCES ON THIS TOPIC   

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Rail Fault Protection

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Overwatch HEFPD

   UPCOMING EVENTS  

If you're in Louisville for the AREMA Annual Conference + Expo today, stop by the Dairyland Booth (#409) to learn more about how Overwatch HEFPD will protect your C&S equipment from AC faults and lightning surge events.

Protecting Railroads from High-Energy AC Faults

TODAY! | Sept. 17, 2024 | 3:15 – 3:45 PM | The Solution Center 

Join Senior Business Development Leader, Phil Eggen, for a short presentation in The Solution Center, located in the Expo Hall, near the AREMA booth. Phil will discuss how AC faults affect railroad equipment and how Dairyland’s Overwatch HEFPD solution addresses these issues. Understand the differences between High Voltage AC (HVAC) power line faults and lightning strikes, and see how robust technology is essential for safely grounding AC faults while maintaining uninterrupted signaling.

  ABOUT DAIRYLAND   

Since 1983, Dairyland has been applying the concepts of electrical isolation, grounding, and over-voltage protection to create standard and specialized electrical solutions to protect equipment and personnel. Dairyland deals with a wide variety of applications across multiple industries including oil and gas, power utility, railroad, and others where it is necessary to provide simultaneous isolation and safety grounding.

We want you to be able to use and understand your products with ease so you can have full confidence in their reliability. Explore the helpful resources on our website or request a consultation for training with our technical support team. We're excited to help!

 Dairyland Electrical Industries, Inc.

P.O. Box 187 | Stoughton, WI 53589 | United States | +1 (608) 877-9900 | www.dairyland.com