AC Breakdown Voltage and Partial Discharge Activity in Synthetic Ester – Based Fullerene and Graphene Nanofluids

Partial Discharge Activity of Inter-turn Insulation under Different Parameters of Square Wave Voltage

IEEJ Transactions on Fundamentals and Materials ◽

10.1541/ieejfms.129.922 ◽

2009 ◽

Vol 129 (12) ◽

pp. 922-930 ◽

Cited By ~ 6

Author(s):

Kai Zhou ◽

Guangning Wu ◽

Xiaoxia Guo ◽

Liren Zhou ◽

Tao Zhang

Keyword(s):

Partial Discharge ◽

Square Wave ◽

Discharge Activity ◽

Turn Insulation

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Analysis of partial discharge activity in line-commutated HVDC converter

2012 International Conference on High Voltage Engineering and Application ◽

10.1109/ichve.2012.6357032 ◽

2012 ◽

Author(s):

Tianyan Jiang ◽

A. Cavallini ◽

G. Montanari ◽

Jian Li

Keyword(s):

Partial Discharge ◽

Discharge Activity

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Electrophysical properties of mixtures of mineral oil and synthetic ester dielectric liquid

Safety and Reliability of Power Industry ◽

10.24223/1999-5555-2021-14-2-132-141 ◽

2021 ◽

Vol 14 (2) ◽

pp. 132-141

Author(s):

M. N. Lyutikova ◽

S. M. Korobeynikov ◽

A. A. Konovalov

Keyword(s):

Dielectric Loss ◽

Breakdown Voltage ◽

Loss Tangent ◽

Dielectric Loss Tangent ◽

Kinematic Viscosity ◽

Mineral Oil ◽

Flash Point ◽

Power Transformers ◽

Synthetic Ester ◽

Insulating Properties

Power transformers are key equipment in power generation, transmission, and distribution systems. The reliability of power transformers is based on the performance of the insulation system, which includes solid cellulose insulation and a liquid dielectric. Modern power engineering requires liquid insulation to have excellent insulating properties, high fire resistance, and biodegradability. Mineral oil that has been in use for over 100 years does not meet certain requirements. Therefore, various methods of enhancing the insulating properties of the oil are currently being considered, including mixing it with other liquid dielectrics, which have excellent properties. Synthetic and natural esters are considered as alternative fluids.This article discusses the possibility of enhancing the insulating characteristics of mineral oil with a high content of aromatic hydrocarbons (for example, T-750 oil) by mixing it with synthetic ester Midel 7131. Assessment is given of insulating parameters of the resulting mixtures with an ester fraction in mineral oil from 0% to fifty%. The main characteristics of the mixtures are described, such as density, kinematic viscosity, flash point, dielectric loss tangent, relative dielectric permittivity, breakdown voltage, and moisture content. It is shown that with an increase in the proportion of ester, some parameters of the obtained insulating liquid improve (flash point, dielectric constant, breakdown voltage), while values of other parameters (density, kinematic viscosity, dielectric loss tangent) with an ester content of more than 10% in the mixture do not meet the requirements for mineral oils.

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