P. Mulroy

Ormazabal (Germany)

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Aritz Hurtado

Ormazabal (Germany)

Ian Gilbert

Southwest Research Institute

Steve Appleby

BT Group (United Kingdom)

Barry Crabtree

BT Research

Mike Nilsson

BT Group (United Kingdom)

I. Orue

Euskadiko Parke Teknologikoa

M.W. Whybray

BT Group (United Kingdom)

R I M Jeffery

A. Goikoetxea

Mondragon University

Luis Del Rio Etayo

Cooperative Institutions

BT Research

Mondragon University

BT Group (United Kingdom)

Suffolk University

Innovate UK

Ormazabal (Germany)

Boston University

Universidad de Zaragoza

Ingeteam (Spain)

Euskadiko Parke Teknologikoa

Author Statistics

Papers

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Research Field

Continuous online monitoring of PD activity in the medium voltage distribution network

22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013) (2013)

P. Mulroy Ian Gilbert Aritz Hurtado

Partial discharges (PD) occur as a result of dielectric breakdown in electrical insulation under high voltage stress. They can be caused by the presence of gas pockets or voids in solid insulation / gas bubbles in liquid insulators (internal), insulator surface imperfections / irregularities (superficial) and around an electrode in gas (corona). PD activity, once initiated, causes chemical and physical degradation of insulating material and can lead to catastrophic failure. Early warning of PD activity and localisation is considered essential to ensure the long term reliable operation of high voltage equipment including cables, cable accessories and switchgear. PD detection in high voltage cable and cable accessories is usually carried out with test objects offline, requiring potentially significant interruption of service. An online detection system is preferable but difficult to calibrate apparent charge magnitudes due to changes in real distribution network loading and topologies. An online PD monitoring system with continuous calibration has been developed to determine the apparent charge magnitudes of PD activity and locations in a section of an in-service distribution network. System components including the online calibration pulse injector, capacitive sensors for high frequency PD pulse detection, and data acquisition, processing and communication components at each monitoring site will be presented. Long term parameter trending data from the ongoing trial in a typical urban distribution network in Spain will also be presented. (4 pages)

10.1049/cp.2013.0890

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Citations (6)

Distribution smart transformer pilot experience for LV grid real time operation

IET conference proceedings. (2023)

Lenin Del Rio Amador P. Mulroy Idoia Cortes Garcia I. Lumbreras L. Layo

This paper describes the experience gained with the operation of a distribution smart transformer pilot in Bilbao. The correlation between voltage violations (events), voltage at the MV/LV Transformer Substation (TS) and unbalanced load consumption peaks has been identified, along with the benefits of balancing feeder loads by a correct deployment planning of new loads and distributed generation. A dynamic voltage set point was recommended in order to avoid or minimize voltage congestions.

Distribution grid

10.1049/icp.2023.1057

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Citations (0)

Equitable quality video streaming for IP networks

International Journal of Internet Protocol Technology (2009)

Mike Nilsson Barry Crabtree P. Mulroy Steve Appleby

We describe an equitable quality video streaming system where the video server dynamically selects between multiple versions of video content coded at different fixed quality levels, and dynamically selects transmission rates for each video session so that the network bandwidth is divided between concurrent users such that they receive equal video quality at each moment in time. By sharing the bandwidth in this way and allowing delivery to get arbitrarily ahead of decoding, equitable quality video streaming can significantly outperform constant bit rate coding and delivery, allowing 100% more video sessions to be delivered at the same overall perceptual quality.

Streaming current

Video Streaming

Live Streaming

10.1504/ijipt.2009.024171

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Citations (2)

Signal processing techniques for on-line partial discharge detection and classification

2021 29th European Signal Processing Conference (EUSIPCO) (2016)

Alex Aranburu Jon Olaizola Maitane Barrenechea P. Mulroy Aritz Hurtado

Partial discharge (PD) detection plays a fundamental role in monitoring the health of medium voltage (MV) systems. This paper presents a method for PD detection and source recognition in MV sub-stations based on a combination of signal processing techniques. Firstly, PD detection and signal conditioning is carried out. Then, PDs of different sources are separated and finally classified by means of the extension set theory. The obtained results show a classification effectiveness of 100% on single source PDs and an effectiveness of 72.5% in multisource PDs, where PDs from many sources are captured in the same data set.

SIGNAL (programming language)

Detection theory

Signal conditioning

Line (geometry)

10.1109/eusipco.2016.7760485

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Citations (3)

BT Technology Journal (1997)

M.W. Whybray G. Morrison P. Mulroy

Videoconferencing

Teleconference

10.1023/a:1018683529632

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Citations (5)

Video coding and delivery challenges for next generation IPTV

BT Technology Journal (2006)

Steve Appleby Barry Crabtree R I M Jeffery P. Mulroy Mike Nilsson

IPTV

Next-generation network

10.1007/s10550-006-0056-3

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Citations (4)

On-line partial discharge monitoring system for distribution networks

IEEE International Conference on Condition Monitoring and Diagnosis (2012)

P. Mulroy Aritz Hurtado David Badetz

Partial discharges (PD) occur as a result of dielectric breakdown in electrical insulation under high voltage stress. PD activity, once initiated, causes chemical and physical degradation of insulating material and can lead to catastrophic failure. Early warning of PD activity and localisation is considered essential to ensure the reliable operation over the long term of high voltage equipment including cables, cable accessories and switchgear. PD detection in high voltage cable and cable accessories is usually carried out with test objects offline, requiring potentially significant interruption of service. An online detection system is preferable but difficult to calibrate apparent charge magnitudes due to changes in real distribution network loading and topologies. An online PD detection system with continuous calibration has been developed to determine the apparent charge magnitudes of PD activity and locations in a section of in-service distribution network with high monitoring frequency and no requirement to take cables off line. Results of the on-line PD monitoring system in a typical urban distribution network in Spain are presented. System components including the online calibration pulse injector, capacitive sensors for high frequency PD pulse detection, and data acquisition, processing and communication components at each monitoring site are presented.

Switchgear

High Voltage

Condition Monitoring

10.1109/cmd.2012.6416200

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Citations (13)

VRML gets real the MPEG-4 way

Computer Standards & Interfaces (1999)

P. Mulroy

Metaverse

10.1016/s0920-5489(99)90764-x

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