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Bus Impedance Matrix

Bus Impedance Matrix

Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...

Fault Types

Fault Types

When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
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Transmission Line Design Considerations

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Energy Stored In A Coaxial Cable

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Cable Subjected to a Distributed Load

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Bewley Lattice Diagram

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Related Experiment Video

Updated: May 7, 2025

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

Long-range data transmission in a fault-tolerant quantum bus architecture.

Shin Ho Choe^1,2, Robert König^1,2

¹Department of Mathematics, School of Computation, Information and Technology, Technical University of Munich, Garching, Germany.

NPJ Quantum Information

|December 30, 2024

Summary

We developed a fault-tolerant method for creating long-range entanglement in quantum computing architectures. This scheme generates high-fidelity entangled qubits efficiently, even with local noise, using a constant-depth circuit.

Keywords:

Information theory and computation Quantum information

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Area of Science:

Quantum Information Science
Quantum Computing Architectures
Entanglement Generation

Background:

Generating long-range entanglement is crucial for quantum computing and communication.
Existing methods often struggle with noise and scalability.
Efficient entanglement distribution remains a key challenge.

Purpose of the Study:

To propose a novel fault-tolerant scheme for generating long-range entanglement.
To achieve constant-fidelity Bell-pair generation independent of distance.
To analyze the resource requirements for noise-resilient entanglement.

Main Methods:

Utilizing a constant-depth circuit on a 3D grid of qubits.
Implementing operations between neighboring qubits.
Analyzing the scheme as a quantum bus or quantum repeater protocol.

Main Results:

The scheme produces a constant-fidelity Bell-pair, robust against local stochastic noise below a realistic threshold.
It is applicable to rectangular qubit arrays of length R.
The number of qubits used is shown to be near-optimal.

Conclusions:

The proposed scheme offers a scalable and fault-tolerant solution for long-range entanglement generation.
It provides a practical approach for quantum computing architectures and quantum repeater protocols.
The findings contribute to the development of robust quantum networks.