Water absorption by oil in MV switchgear

Pondes, A; Meulemeester, E. de; Meeks, Torrey; Slootweg, J.G.; Schenkel, Erik

doi:10.1049/cp.2009.0583

Cited by 3 publications

(1 citation statement)

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“…Here, MOBs that are considered as the relatively highest risk are the ones containing oil for bus bar insulation without resin bonded paper, thus no barrier between individual phases and no barrier between phase conductor and ground potential. This ranking is due to the potential possibility of moisture affecting the break-down strength of oil [1,2] and particularly the risk of formation of free water in oil.…”

Section: Replacement Strategymentioning

confidence: 99%

Risk management of ageing assets; minimum oil breakers

Picard

Boender²

2013

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

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A significant number of minimum-oil breakers has been installed in HV substations and distribution cabinets of regional network operator Stedin. E.g. 35% of all bays in HV stations. Eaton, the successor to the original manufacturers Coq and Hazemeyer intended to end the support of these breakers in 2014. The paper describes the ensuing risk evaluation, options and two-track approach chosen by Stedin to manage the risk: 1. Replacement of switchgear within a period of 20 years, 2. Conservation of the 10 -25kV switchgear that have not been replaced, during 20 years, in cooperation with the successor to the original supplier. For conservation, a long term cooperation has been agreed upon with Eaton. For the other track, replacement, a replacement sequence is elaborated.

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Section: Replacement Strategymentioning

confidence: 99%

Risk management of ageing assets; minimum oil breakers

Picard

Boender²

2013

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

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Influence of environmental and operational conditions on breakdown voltage of oil in switchgear

Djairam

Chmura

et al. 2012

2012 IEEE International Conference on Condition Monitoring and Diagnosis

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In non-hermetically sealed medium voltage oil switchgear (MV OIS), insulating oil will absorb water from the ambient air. Humidity influenced by the acidity of the oil affects the breakdown voltage. Moreover, switching actions causes copper particles from the switching contacts to be released in the oil. To assess and consequently reduce the risk of failures due to breakdown of oil, parameters such as tan , acidity, aging times, copper particles content, etc. have been measured. It will be shown that while tan and acidity increase during accelerated aging tests, the breakdown voltage of oil is not significantly affected under constant humidity. However, during the condensing process, the acidity does affect the varying humidity, which in turn has a significant effect on the breakdown voltage. Decreases in the breakdown strength have been found between 17 and 29 percent.

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High-Voltage Subsea Connectors: Enabling Innovative Subsea Power Distribution Solutions

Plant

2020

Day 3 Wed, May 06, 2020

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This paper focuses on the development of the world's first high-voltage (HV) 45kV, wet-mate connector system1 qualified in accordance with the Subsea Electrical Power Standardization (SEPS) SP-1001 Penetrators and Connectors cross-operator standard. The connector is rated for water depths up to 3,000 meters and is a key enabler of numerous offshore applications, including subsea electrical power grids; independently retrievable, high-power step-down transformers for long step-out subsea gas compression; cost-effective installation of deepwater pipelines with direct electrical heating (DEH); and simplified repair of deepwater high-voltage umbilical power cores (among others). The high voltage and current rating of the connector provides the opportunity for commonality between the primary and secondary of a subsea transformer. This reduces the cost of mating tools, protective caps and test equipment, thus improving the economics of utilizing wet-mate connectors, which can often be cost-prohibitive. The paper discusses the growing need for a clear industry standard that covers the development and qualification of HV wet-mate electrical connectors. It also explores the inherent challenges of subsea electrical connectors, including long-term reliability, subsea module integration activities, and long-term effects of sea-water immersion on insulating materials. These were identified through a policy of continuous stakeholder engagement and a thorough review of 40 years of low- and medium-voltage connector design. To illustrate the benefits that HV wet-mate connectors can provide, multiple use cases are discussed, including long step-out subsea compression; deepwater pipeline DEH; and HV umbilical repair.

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Water absorption by oil in MV switchgear

Cited by 3 publications

References 0 publications

Risk management of ageing assets; minimum oil breakers

Risk management of ageing assets; minimum oil breakers

Influence of environmental and operational conditions on breakdown voltage of oil in switchgear

High-Voltage Subsea Connectors: Enabling Innovative Subsea Power Distribution Solutions

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