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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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Related Experiment Video

Updated: Feb 23, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Joint Resource Optimization for Cognitive Sensor Networks with SWIPT-Enabled Relay.

Weidang Lu¹, Yuanrong Lin², Hong Peng³

¹College of Information Engineering, Zhejiang University of Technology, Hangzhou 310014, China. luweid@zjut.edu.cn.

Sensors (Basel, Switzerland)

|September 14, 2017

Summary

This summary is machine-generated.

This study explores simultaneous wireless information and power transfer (SWIPT) in cognitive sensor networks (CSNs). Joint optimization of power and splitting ratios significantly enhances network performance and lifetime.

Keywords:

CSN SWIPT amplify-and-forward energy harvesting power splitting

Related Experiment Videos

Last Updated: Feb 23, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Area of Science:

Wireless Communication Networks
Energy Harvesting Technologies
Cognitive Radio Systems

Background:

Energy constraints in wireless sensor networks (WSNs) limit operational duration.
Simultaneous wireless information and power transfer (SWIPT) offers a solution for extending network lifetime.
Cognitive sensor networks (CSNs) enable efficient spectrum utilization.

Purpose of the Study:

Investigate the performance of an underlay CSN employing a SWIPT-enabled relay node.
Optimize resource allocation for enhanced network throughput and longevity.
Ensure interference mitigation to primary users (PUs).

Main Methods:

Utilizing an amplify-and-forward (AF) relay sensor node (SSN) for signal forwarding.
Implementing a power splitting-based relaying (PSR) protocol for energy harvesting from radio-frequency (RF) signals.
Jointly optimizing transmit power and power splitting ratio.

Main Results:

Achieved maximization of the CSN's achievable rate under interference constraints.
Demonstrated significant performance improvements through joint resource optimization.
Validated the effectiveness of the proposed SWIPT-based relaying strategy.

Conclusions:

SWIPT is a viable technique for prolonging the operational time of energy-constrained wireless networks.
Joint resource optimization in CSNs with SWIPT relays enhances achievable rates.
The proposed method effectively balances performance gains with interference constraints.