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Seltzer-Grant M.,HVPD Ltd | Winter K.,Swedish Neutral AB | MacKinlay R.,HVPD Ltd | Renforth L.,HVPD Ltd
IET Conference Publications | Year: 2013

The technique of controlling neutral voltage and current is applied in medium- And high-voltage electricity networks as a means of eliminating earth fault currents. The complete compensation of earth fault currents is achieved using modern power electronics developed by Swedish Neutral. The GFN Ground Fault Neutralizer uses beside traditional Petersen Coil technology a novel Residual Current Compensator (RCC) to archive a very fast and complete elimination of the earth fault current. Injection of voltage into the transformer neutral using this system, also allows control of the phase-ground voltages under normal operation. This in turn allows partial discharge (PD) activity in the cables and connected plant to be incepted and extinguished through voltage increase and reduction on a phase-by-phase basis, providing a very powerful diagnostic system. The paper presents results from on-line partial discharge (OLPD) testing combined with neutral voltage displacement on MV networks. Case studies are presented from testing with fabricated defects and on two MV networks as part of GFN system commissioning.

Renforth L.A.,HVPD Ltd | Armstrong R.,Tengizchevroil | Clark D.,University of Manchester | Goodfellow S.,HVPD Ltd | Hamer P.S.,High Voltage Partial Discharge Ltd.
IEEE Industry Applications Magazine | Year: 2014

In this article, a new technique is presented for the remote online partial discharge (OLPD) monitoring of the stator insulation condition of in-service, high-voltage (HV) rotating machines with a focus on the Ex/ATEX HV motors used in the petrochemical industry. The technique applies wideband, ferrite-based high-frequency current transformer (HFCT) sensors and high-resolution measurement technology. This remote PD monitoring technique has significant advantages when monitoring motors located in Ex/ATEX hazardous gas zones in oil and gas and petrochemical facilities. © 1975-2012 IEEE.

Seltzer-Grant M.,HVPD Ltd | Renforth L.,HVPD Ltd | Djokic S.,University of Edinburgh | McKeever P.,Narec
IET Conference Publications | Year: 2013

The authors present a paper detailing their experiences (over the past 5 years) in the insulation condition monitoring of land-sea export cables and subsea array and platform interconnection cables in the UK offshore renewables and oil & gas industries. The paper focusses on the use of partial discharge (PD) testing to detect and locate pre-fault PD activity and also the use of time domain reflectometery (TDR) techniques to provide a 'fingerprint' of the cables and to help pinpoint cable faults after they have occurred. The paper will also discuss a 'holistic' monitoring approach, combining a number of condition monitoring technologies, to achieve necessary information to support improved CBM. For the HV networks, power quality monitoring should be integrated with the monitoring of partial discharge (PD), cable sheath current and weather data (i.e. wind, wave or tidal energy resources, power flows and occurrence of overvoltage/overcurrent conditions), with the further cross-correlation of all of these condition and state parameters, in order to allow for the early detection, faster identification and efficient resolving of faults, failures and other problems during the operation. The purpose of such an integrated monitoring platform is therefore, to provide an advanced 'early warning' against insulation faults to enable planning of preventive or corrective maintenance to be carried out and to avert unplanned outage.

Giussani R.,HVPD Ltd | Renforth L.,HVPD Ltd | Seltzer-Grant M.,HVPD Ltd | Zachariades C.,University of Manchester
33rd Electrical Insulation Conference, EIC 2015 | Year: 2015

A new holistic technique for the combined electrical and mechanical condition monitoring (CM) of high voltage (HV) rotating machines has been developed. It is mainly aimed at the oil and gas sector where machine failure can potentially have catastrophic consequences as well as a huge financial cost. The technique combines partial discharge (PD) monitoring, motor current signature analysis (MCSA), power quality (PQ) monitoring and vibration monitoring. The sensors employed include a newly developed tri-band sensor for online partial discharge (OLPD) detection, PQ and MCSA measurements as well as accelerometers for vibration monitoring. The sensors and monitoring modules are complemented by a CM database for trending and benchmarking purposes. Case studies from oil and gas customers emphasize the importance of using a permanent, continuous, combined monitoring solution. © 2015 IEEE.

Renforth L.A.,HVPD Ltd. | Hamer P.S.,Chevron | Clark D.,University of Manchester | Goodfellow S.,HVPD Ltd. | Tower R.,Tengizchevroil
IEEE Transactions on Industry Applications | Year: 2015

This paper presents results from the continued application of a new technique for the remote online partial discharge (OLPD) testing and monitoring of in-service high-voltage (HV) explosive atmosphere (Ex)/atmosphere-explosive (ATEX) motors operating in hazardous gas zones. The technique employs high-current wideband high-frequency current transformer sensors located remotely from the motor under test, at the switchboard end of the HV feeder cable. Significant cost and operational benefits can be gained from this remote monitoring technique as the stator winding condition of these motors can be monitored without having to enter the hazardous gas (Ex/ATEX) zone. The work described in this paper is a continuation of that carried out by the same authors, as reported at the 2012 IEEE Petroleum and Chemical Industry Technical Conference, and includes the development of proposed condition guidelines for assessing the condition of the stator winding insulation systems of large populations of aged HV motors, based on an OLPD "league-table" database. Two case studies are presented wherein the HV stator insulation condition and reliability of in-service motors, operating in hazardous gas zones, and HV generators were assessed using both online and offline partial discharge (PD) testing and monitoring techniques. The case studies emphasize the importance of carrying out extended continuous OLPD monitoring of in-service rotating HV machines to detect underlying trends in PD activity over time. This paper concludes with how condition monitoring data can support reliability-centered maintenance and condition-based management regimes. © 1972-2012 IEEE.

Giussani R.,HVPD Ltd | Seltzer-Grant M.,HVPD Ltd | Renforth L.,HVPD Ltd | Waugh W.,Newcastle University
European Wind Energy Association Conference and Exhibition 2014, EWEA 2014 | Year: 2014

The implementation of electrical condition monitoring (CM) technology in the offshore wind farm (OWF) industry has been limited to date. There is presently no system available in the market that can effectively perform the monitoring and correlation of several electrical condition parameters to enhance the insulation condition assessment (ICA) of the network. This paper is an extension of the work published by the authors in the 2013 EWEA Offshore Conference in Nov 2013 on the importance of 'holistic' insulation condition monitoring (CM) and testing, both at the commissioning/acceptance phase and then into the service life of the cable networks. To further improve the CM of the cable networks in the OWF market sector, the authors present a new system (OHVMS) that is capable of monitoring the state and condition of the network. This work presents the results from the field trial of this new technology. The system acquires and records, on a continuous basis, partial discharge (PD), power quality (PQ) and cable sheath currents (SC) data. The ongoing analysis of the data shows how correlating the effect of phenomena on differing parameters can help to increase the understanding of the real state of the systems, improving the Condition Based Management (CBM) of the assets. The data has been recorded on both 33kV inter-array cables and 132kV export cables on a number of UK offshore wind farms over a period of several months. A case study in which the system has helped to identify PD on an offshore site is reported herein.

Renforth L.,HVPD Ltd | Burgess A.,HVPD United States | Foxall M.,HVPD Ltd | Raczy T.,HVPD Ltd
2014 IEEE Petroleum and Chemical Industry Conference - Brasil, PCIC Brasil 2014 | Year: 2014

The authors describe a new approach to on-line partial discharge (OLPD) insulation condition monitoring (CM) of complete high voltage (HV) networks (voltage range: 3.3 kV to 132 kV) in the oil & gas industry. The technique described is suitable for the condition monitoring of HV generators, switchgear, cables, motors and transformers. Comprehensive HV network OLPD condition monitoring coverage is achieved through the use of wideband, OLPD sensors and continuous monitors located at the central switchboards of the facility. The complete HV network condition monitoring system described in this paper is an extension of a CM system originally developed by the authors for remote OLPD monitoring of the stator winding condition of Ex/ATEX HV motors operating in hazardous gas zones. This technique utilises wideband, high frequency current transformer (HFCT) OLPD sensors located at the central HV switchboards to detect partial discharge (PD) signals that originate in remotely-connected HV plant and have propagated down the cable feeder circuit to the switchgear. This remote monitoring technique was presented by the lead author at the IEEE-PCIC 2012 [1] and IEEE-PCIC 2013 [2] for the application of OLPD condition monitoring of EX/ATEX HV motors, whilst avoiding the need to install sensors in the hazardous gas zone. In this paper, the authors describe how this remote OLPD monitoring technique can be extended to include the insulation condition monitoring of other HV assets including; generators, switchgear, cables and transformers, using the same wideband HFCT sensors attached to the HV cable terminations located at the central switchboards. The authors provide a number of case studies describing some past projects on the OLPD testing and monitoring of in-service HV generators, switchgear, cables, motors and transformers within the oil & gas industry. The applications knowledge obtained from these past projects on different plant types has been used by the authors in the development of this innovative, complete HV network condition monitoring solution. © 2014 IEEE.

Seltzer-Grant M.,HVPD Ltd | Goodfellow S.,HVPD Ltd | Foxall M.,HVPD Ltd | Renforth L.,HVPD Ltd
European Wind Energy Conference and Exhibition, EWEC 2013 | Year: 2013

It is understood (from discussions with UK offshore wind farm operators and the insurance industry) that medium voltage (MV) and high voltage (HV) cable faults presently make up around 90% of offshore wind farm insurance claims made to date. It is also reported that many of these claims relate to cable insulation faults occurring either during the construction and commissioning phase or during the first 2-3 years of service. This is the 'infant mortality' phase of the reliability centred maintenance (RCM) 'bathtub curve'. The UK Government's Department of Energy and Climate Change (DECC) have stated that they require the (presently high) operational and maintenance (O&M) costs to fall by 25% by 2020 to make this offshore renewables electricity more affordable to the UK consumer. DECC have published a Levelised Cost of Electricity (LCOE) model that predicts the total cost over the 20-year lifetime of the asset. This predicts a present cost of £135 per MWh generated for a 'typical' 500MW+ offshore wind farm with DECC placing a target of bringing this below £100 per MWh generated (a reduction of 25%). This can only be achieved by reducing the presently very high O&M costs, particularly those costs associated with unplanned outages caused by cable faults. The authors propose that in order to achieve this reduction in O&M costs a radical rethink of existing offshore HV network asset management practices is needed by the offshore wind farm operators through the use of 'holistic' condition monitoring (CM) solutions. It is through the use of 'holistic' condition monitoring (CM) technology that preventative maintenance interventions can be targeted to 'incipient' faults on the network, to allow the operator to be 'ahead of the game'. The paper presents an overview of some of the electrical condition monitoring (CM) solutions that are being developed by the HVPD and our partners in the offshore renewables industry. These technologies include a new offshore high voltage AC network Monitoring System (OHVMS) for AC MV and HV cable networks and a new On-line High Voltage Direct Current Condition Monitor (OLPD-HVDC) for HVDC cable networks. The paper includes a case study of a project involving on-line partial discharge (OLPD) measurement techniques is presented, including an example of PD diagnostic testing on a 13km-long, 33kV land-sea export cable to a UK offshore wind farm. This case study shows how the diagnostic, condition monitoring data from OLPD testing and monitoring enabled the wind farm operator to implement preventative maintenance intervention to avoid an unplanned outage, providing a cost saving to the operator in excess of £250,000.

Asiri Y.,Saudi Aramco | Vouk A.,Saudi Aramco | Renforth L.,HVPD Ltd | Clark D.,University of Manchester | Neuralware J.C.,NeuralWare
2011 Electrical Insulation Conference, EIC 2011 | Year: 2011

This paper discusses the general application of using Neural Networks (NN) to classify six different types of Partial Discharge (PD). Stator winding failures contribute about 30-40% of the total motor failures according to IEEE and EPRI. Ninety percent (90%) of electrical failures on High-Voltage (HV) equipment are related to insulation deterioration. Large datasets were collected for motors with PD defects as well as PD-free machines. The datasets of PD were pre-processed and prepared for use with a NN using statistical means. It was possible to utilise the advantages offered by multiple NN models to classify the PD defects with a maximum recognition rate of 94.5% achieved, whereas previous research work did not exceed a classification accuracy of 79%. © 2011 IEEE.

HVPD Ltd., experts in on-line condition monitoring of high voltage networks, announce the global release of a brand new solution for the detection of Partial Discharge (PD) in rotating machines, the PDS Insight™ Machines. This ground-breaking technology can be used to detect and trend PD, a common cause of electrical failures in these critical assets. HVPD have been developing and distributing simple-to-use handheld PD testers since 2007, with over 400 customers in the utility, transport, and oil and gas sectors using this type of equipment for safety screening and to support condition based maintenance. In response to high customer demand, the PDS Insight™ Machines has been especially developed for testing rotating machines. Dr Malcolm Seltzer-Grant, HVPD’s Technical Director, said: “The PDS Insight™ Machines unit will support our customers in testing motors and generators in a more cost-effective way. The unit connects to pre-installed coupling capacitor sensors, which ultimately eliminates the need for an outage during periodic testing.” The PDS Insight™ Machines belongs to a new generation of On-line Partial Discharge (OLPD) technology and is equipped with cutting-edge features including a Smart Docking Station, internal storage, barcode scanner, Bluetooth© connectivity and a dedicated asset management tablet application - the OLPD Manager™ app. used for analysis, benchmarking and trending of results. The PDS Insight™ Machines unit measures PD levels, PD pulse count and cumulative PD activity across the 50/60 Hz power cycle, enabling the user to determine the severity of any PD activity. Rachel Stratton, HVPD’s Commercial Director, said: “Solving problems for our customers plays an important role in our product development. The PDS Insight™ Machines unit creates a new standard for OLPD handheld technology which supports customer needs in the rotating machines market. By combining four types of PD sensors: HVCC, HFCT, TEV and AA it is the only handheld unit on the market with the functionality to take PD measurements on rotating machines in addition to cables, switchgear and transformers.” Find out more about PDS Insight™ Machines: http://www.hvpd.co.uk/testing-and-monitoring-tools/pds-insight-machines/ Background information HVPD Ltd HVPD Ltd, founded in 2006, are experts in the growing industry of On-line Partial Discharge (OLPD) testing and monitoring of in-service, high voltage equipment. We offer a complete range of OLPD test services, test equipment and monitoring equipment that provides an early warning of incipient faults and deterioration in medium and high voltage insulation, allowing plant owners to take early corrective action and to avoid unplanned outages. We provide bespoke solutions to our growing customer base in oil and gas, renewables, shipping, transmission and distribution, and generation industries. Over 400 customers in over 100 countries already trust our technology.

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