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In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
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Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
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Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
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A real-life based evaluation method of deployable vulnerable road user protection systems.

Rikard Fredriksson1, Mikael Dahlgren, Margriet van Schijndel

  • 1a Autoliv Research , Vårgårda , Sweden.

Traffic Injury Prevention
|October 14, 2014
PubMed
Summary

A new real-world test method for vehicle protection systems significantly reduced head and chest injuries for pedestrians and cyclists. The prototype system effectively deployed, lowering severe head injury risk from 100% to under 20%.

Keywords:
VRU airbagactive hoodcyclistfull-body testpedestrianvulnerable road user

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Area of Science:

  • Road safety engineering
  • Vehicle safety systems
  • Biomechanics of injury

Background:

  • Current vehicle safety testing often lacks real-world accident scenarios.
  • Vulnerable road users (VRUs) like pedestrians and cyclists are at high risk in vehicle collisions.
  • There is a need for advanced evaluation methods that incorporate full-body loading of VRUs.

Purpose of the Study:

  • To develop a realistic evaluation method for vehicle protection systems using full-body VRU loading.
  • To assess a prototype pedestrian and cyclist protection system using the developed method.
  • To analyze the effectiveness of an active hood and windshield airbag system.

Main Methods:

  • Developed 5 test setups based on severe crash data (2 pedestrian, 3 cyclist).
  • Utilized the Polar II pedestrian anthropomorphic test device on a standard bicycle or standing.
  • Evaluated a prototype system (active hood, windshield airbag) on a passenger car, assessing head, neck, and chest loading.

Main Results:

  • The protection system deployed successfully before VRU contact in all setups.
  • Head Injury Criterion (HIC) values decreased significantly, from up to 4400 to below 650.
  • Risk of severe head injury (AIS 3+) reduced from 85-100% to under 20% across all setups.
  • Neck loading remained acceptable, and chest loading decreased, particularly in lateral cyclist impacts.

Conclusions:

  • A novel, real-life-based test method was developed as a complement to existing component tests.
  • The evaluated protection system demonstrated effective positioning and protection capabilities.
  • The system shows potential to prevent common severe upper-body injuries in pedestrians and cyclists in real-world accidents.