A new approach of tap changer maintenance incorporating nanoparticle insulating oil

Ghoneim, Sherif S. M.; Dessouky, Sobhy S.; Taha, Ibrahim B. M.; Shaaban, Mohamed; Abdelwahab, Saad A. Mohamed

doi:10.1007/s00202-020-01137-w

Cited by 7 publications

(5 citation statements)

References 28 publications

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“…The insulating oil with a low flash point might induce irreparable failures owing to flammable and combustible fumes created by overload or local overheating. 110,111 As a result, the flash point is the most critical of these three characteristics. When a little flame is close to the oil, the fire point is defined as the minimal temperature at which the oil vapour continues to burn for at least five seconds.…”

Section: Flash Point/fire Point/pour Pointmentioning

confidence: 99%

Modification of insulating oils and oil-based titanium dioxide nanofluids for transformers: a review

Zhang¹,

Zuo²,

Cai³

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Flash Point/fire Point/pour Pointmentioning

confidence: 99%

Modification of insulating oils and oil-based titanium dioxide nanofluids for transformers: a review

Zhang¹,

Zuo²,

Cai³

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Discharges Of High Energy (D2)mentioning

confidence: 99%

“…Figure 2 shows a carbonized tap changer during maintenance of the OLTC. If the OLTC are not properly maintained or left unattended, the chances for it to explode is high as sparks during the tap changing process will ignite the highly flammable gas such as acetylene [3]. Based on a DGA result by a condition-monitoring specialist, it is indicated that the OLTC was experiencing the thermal fault and discovered that the arm contacts and springs were severely burned in the red phase, as shown in Figure 3 Based on a DGA result by a condition-monitoring specialist, it is indicated that the OLTC was experiencing the thermal fault and discovered that the arm contacts and springs were severely burned in the red phase, as shown in Figure 3 [2].…”

Section: Partial Dischargementioning

confidence: 99%

“…Damage to switching contacts and other components can cause the OLTC to malfunction and fail, reducing the transformer's reliability. Several surveys have found that OLTC faults account for a significant portion of transformer failures [1][2][3][4][5]. As a result, utilities would benefit substantially from establishing robust OLTC CM strategies.…”

Section: Introduction Of Condition Monitoring For the Oltcmentioning

confidence: 99%

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An Offline and Online Approach to the OLTC Condition Monitoring: A Review

et al. 2022

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Transformer failures have a significant cost impact on the operation of an electrical network. In many utilities, transformers have been operating for many years past their expected usable life. As power demand has surged, transformers in some areas are being loaded beyond their rated capacity to meet the demand. One of the vital components in a transformer is the on-load tap changer (OLTC), which regulates the voltage in the distribution network. This study aims to review several condition-monitoring techniques (online and offline) that can monitor the health of the OLTC and assure the safety of the transformer’s OLTC from irreparable damage by detecting the defect at an earlier stage, which is preceded by the specification of typical faults. This paper also discussed the common faults of the OLTC and the root causes of these faults. The OLTC is prone to mechanical faults due to its frequently changing mechanism in the tap operation. The OLTC are also prone to oil as well as thermal faults. As a result, it is critical to monitor OLTC conditions while they are in use. Proper management of condition monitoring (CM) for the OLTC is useful and necessary to increase availability and achieve optimised operating. Condition monitoring (CM) and diagnostics methods (DM) have been developing since the 1950s. CM and DM have been implemented to diagnose and detect an incipient fault, especially for the OLTC. Many techniques, online and offline, are being used to monitor the condition of the OLTC to prevent failure and minimize outages. These DM and CM will prolong the operational cycle and avoid a major disaster for the OLTC, which is an unfavorable scenario.

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“…Abdali et al showed that the insertion of 0.01% weight percentage of diamond nanoparticles inside mineral oil can reduce the hotspot temperature to 5.1 °C and enhance the coolant properties of the mineral oil [ 28 ]. Finally, Ghoneim et al introduced a new approach to transformer tap changer maintenance using insulating oil-based nanoparticles [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Mineral Oil-Based Nanofluids on the Temperature Distribution and Generated Heat Energy Inside Minimum Oil Circuit Breaker in Making Process

et al. 2023

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The enhancement of the thermal properties of insulating oils has positively reflected on the performance of the electrical equipment that contains these oils. Nanomaterial science plays an influential role in enhancing the different properties of liquids, especially insulating oils. Although a minimum oil circuit breaker (MOCB) is one of the oldest circuit breakers in the electrical network, improving the insulating oil properties develops its performance to overcome some of its troubles. In this paper, 66 kV MOCB is modeled by COMSOL Multiphysics software. The internal temperature and the internally generated heat energy inside the MOCB during the making process of its contacts are simulated at different positions of the movable contact. This simulation is introduced for different modified insulating oils (mineral oil and synthetic ester oil) with different types of nanoparticles at different concentrations (0.0, 0.0025, 0.005, and 0.01 wt%). From the obtained results, it is noticed that the thermal stress on the MOCB can be reduced by the use of high thermal conductivity insulating oils. Nano/insulating oils decrease internal temperature and generate heat energy inside the MOCB by about 17.5%. The corresponding physical mechanisms are clarified considering the thermophoresis effect.

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A new approach of tap changer maintenance incorporating nanoparticle insulating oil

Cited by 7 publications

References 28 publications

Modification of insulating oils and oil-based titanium dioxide nanofluids for transformers: a review

Modification of insulating oils and oil-based titanium dioxide nanofluids for transformers: a review

An Offline and Online Approach to the OLTC Condition Monitoring: A Review

Influence of Mineral Oil-Based Nanofluids on the Temperature Distribution and Generated Heat Energy Inside Minimum Oil Circuit Breaker in Making Process

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