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Circuit Breaker and Fuse Selection01:23

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A circuit breaker is a device engineered to interrupt fault currents and sometimes reclose automatically. When a fault current is detected, the breaker separates the electrical contacts, which generates an arc. This arc is extinguished by methods such as elongation, cooling, or splitting, depending on the breaker's design. Breakers are categorized based on the voltage they operate at and the medium used for arc extinction, such as air, oil, SF6 gas, or vacuum.
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Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
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Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
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Reliability and Remaining Life Assessment of an Electronic Fuze Using Accelerated Life Testing.

Noor Muhammad1, Zhigeng Fang1, Syed Yaseen Shah2

  • 1College of Economics and Management, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China.

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|March 12, 2020
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Summary

Electronic fuzes require reliability testing for mission-critical components. Passive electronic components degrade over ten years, while detonators maintain high reliability, ensuring extended operational life.

Keywords:
accelerated life testing (ALT)electronic fuzeone short systemreliabilityremaining useful life (RUL)

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Area of Science:

  • Reliability Engineering
  • Electronic Systems
  • Materials Science

Background:

  • Electronic fuzes are mission-critical, one-shot systems with long storage requirements.
  • Current testing methods lack prognostic capabilities for electronic circuits.
  • Component degradation occurs due to storage and operational stresses, impacting reliability.

Purpose of the Study:

  • To identify weak links in electronic fuze circuits.
  • To estimate the reliability and remaining useful life (RUL) of electronic and detonating components.
  • To address the lack of thorough reliability investigations on electronic parts in fuzes.

Main Methods:

  • Accelerated life testing (ALT) on critical electronic fuze components.
  • Identification of three key components: diode, capacitor, and squib (detonator).
  • Analysis of component degradation after simulated long-term storage.

Main Results:

  • Active electronic components (diodes) show no significant degradation after ten years.
  • Passive components (capacitors) require replacement after ten years of simulated storage.
  • The squib (detonator) demonstrates a RUL exceeding ten years with over 99% reliability.

Conclusions:

  • Passive components are the primary limiting factor for long-term electronic fuze reliability.
  • Detonating components (squibs) exhibit robust longevity and reliability.
  • Prognostic testing is crucial for assessing the RUL of electronic fuze assemblies.