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Reclosers and Fuses01:26

Reclosers and Fuses

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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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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
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Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Overcurrent Relays01:26

Overcurrent Relays

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Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
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Distribution reliability in electrical power systems is critical for ensuring an uninterrupted power supply to consumers at minimal cost. According to IEEE Standard Terms, reliability is the probability that a device will function without failure over a specified time period or amount of usage. For electric power distribution, this translates to maintaining continuous power supply and addressing customer concerns over power outages. Several indices, as defined by IEEE Standard 1366-2012, are...
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RAD (Resist-Accept-Direct) switch points and triggers for adaptation planning.

A J Lynch1, J D Ashander2, T W Ciocco3

  • 1U.S. Geological Survey (USGS), National Climate Adaptation Science Center, 12201 Sunrise Valley Drive, MS-516, Room 2A128A, Reston, VA, 20192, USA.

Journal of Environmental Management
|August 7, 2025
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Summary
This summary is machine-generated.

Climate change impacts ecosystems, necessitating adaptive management. The Resist-Accept-Direct (RAD) framework guides decisions on ecosystem change, introducing switch points and triggers for pathway transitions.

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Area of Science:

  • Ecology
  • Environmental Management
  • Conservation Biology

Background:

  • Climate change is a significant driver of global ecosystem transformation.
  • The Resist-Accept-Direct (RAD) framework provides a structured approach for natural resource management in response to ecosystem changes.
  • Decisions within the RAD framework involve complex considerations and the potential need to switch between management pathways over time.

Purpose of the Study:

  • To introduce and define the concepts of RAD switch points and triggers.
  • To support decision-making processes for adaptive ecosystem management under climate change.
  • To provide a framework for iteratively reevaluating RAD pathway choices.

Main Methods:

  • Conceptual development of RAD switch points and triggers.
  • Application of concepts through case studies in ecosystem management.
  • Synthesis of findings across diverse ecological contexts.

Main Results:

  • Identified key considerations for determining when to transition between RAD pathways (Resist, Accept, Direct).
  • Demonstrated the utility of switch points and triggers in practical management scenarios.
  • Highlighted the iterative nature of RAD pathway selection in response to changing environmental conditions.

Conclusions:

  • The RAD framework, augmented by switch points and triggers, offers a robust approach to managing ecosystems under climate change.
  • Effective ecosystem management requires ongoing evaluation and adaptation of strategies based on ecological and socio-economic factors.
  • Case studies illustrate the practical application of these concepts for informed decision-making in conservation and resource management.