Tandem-chamber charge density monitor

Nelson, J. K.; Lee, M.J.

doi:10.1109/14.52390

Cited by 20 publications

(5 citation statements)

References 4 publications

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“…They include the pipe flow system [8] and Oommen mini-tester [9,10], Couette system of rotating cylinders [11,12] and rotating disc system [13]. Another group of small systems for both, laboratory and diagnostic tests are the charge volume density sensor built at MIT, so called ACS (Absolute Charge Sensor) [14] and a system with double Nelson chamber [15]. The scope of ECT tests included, among others, the effect of flow velocity [16], temperature [17], thermal aging [18].…”

Section: Introductionmentioning

confidence: 99%

Streaming electrification of mineral insulating oil and synthetic ester MIDEL 7131

Zdanowski

2014

IEEE Trans. Dielect. Electr. Insul.

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Determining the Electrostatic Charging Tendency (ECT) level of insulating liquids requires no large and therefore costly transformers or modelling systems. Small laboratory systems are characterised by simple design and methodology, low volume of liquid sample required for testing, low cost of construction and the following tests. This also applies to pipe flow systems. This paper presents comparative studies of the phenomenon of streaming electrification of mineral TRAFO EN insulating oil and MIDEL 7131 ® synthetic ester flowing through a pipe made of conventional cellulose paper and modern aramid paper. Electrification current vs. liquid flow speed was measured. The influence of pipe material was determined. Also the effect of temperature and sample aging time on the extent of the streaming electrification was studied. With the Abedian-Sonin model, volume density of the q w charge, which is a parameter describing ECT of insulating liquids, was determined.

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Section: Introductionmentioning

confidence: 99%

Streaming electrification of mineral insulating oil and synthetic ester MIDEL 7131

Zdanowski

2014

IEEE Trans. Dielect. Electr. Insul.

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“…It uses the relaxation behavior of the electrostatically charged fluid and consists of two identical measurement chambers (5), the housings of the measurement chambers are separated by an isolating flange (6). adapted from [15] The volume charge density is approximated from the differential current measurement of the two electrometers (9), taking the volume flow into account. The Tandemchamber Charge Density Monitor is not suitable, if higher volume flows are to be investigated, as charges could be dragged from the first chamber to the second.…”

Section: Measuring Charges In Fluidsmentioning

confidence: 99%

Electrostatic charge measurement in hydraulic circuits

Kuehnlein¹,

Wendel²,

Murrenhoff³

2013

Linköping Electronic Conference Proceedings

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Electrostatic charging of hydraulic circuits is recently becoming an issue as low conducting hydraulic fluids are increasingly in use. Charge generation is more likely to accumulate and build up large voltages. These high charge accumulations are hazardous as they can damage system components such as filters, which can eventually lead to system failure. In order to develop appropriate counter measures, a precise knowledge of influencing parameters is strongly beneficial. In this paper the causes for charge generation are discussed. Furthermore, methods for charge measurement of hydraulic fluids are presented. As the researched measurement methods are considered inappropriate, a new charge measurement method is developed. The development based on the principles of Faraday-cup and Faraday-cage are discussed in detail. Moreover, the integration of the developed charge sensors into an also developed experimental setup is described. The test rig in combination with the charge sensor allows the quantitative measurement of charged fluid without influencing the fluid to be investigated. It also enables measurements under pressure, meaning that the fluid can be pressurised up to 140 bar. The experimental setup is destined to obtain a large data basis. This data basis allows the validation of a charging model for which the modelling approach is also presented in this paper. This will lay the basis for a charging model to predict the charging tendency of a hydraulic system.

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“…Therefore, electrification tests were performed on actual transformers [17] and then, on large laboratory systems modelling their operation [18]. Then, small laboratory systems were introduced [19][20][21][22][23][24][25][26][27]. The objective of the extensive research was to gain a thorough knowledge of the nature of the streaming electrification phenomenon and to find efficient means of reducing it.…”

Section: Introductionmentioning

confidence: 99%

“…The objective of the extensive research was to gain a thorough knowledge of the nature of the streaming electrification phenomenon and to find efficient means of reducing it. Mineral oils [12][13][14][15][16][17][18][20][21][22][23][24][25][26][27][28][29][30][31][32] and synthetic liquids [33][34][35][36][37], as well as pure hydrocarbons and their mixtures [38][39][40] were tested. Among others, the effect of hydrodynamic conditions [41], temperature [14,33,37,42], ageing processes [29,36,37,43,44] and properties of solid materials [37,45] were analysed.…”

Section: Introductionmentioning

confidence: 99%

Archives of Electrical Engineering

Zdanowski,

Maleska

2019

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Extensive efforts have been made for many years by the power generating industry to replace conventional solid and liquid insulation with synthetic materials. Those measures are aimed at increasing the load capacity, improved fire safety and extending transformer life during exploitation. Modern insulating materials include aramid fibre-based paper and insulating fluids made of synthetic and natural esters. The paper presents research results of the electrostatic charging tendency (ECT) of mixtures of fresh and aged mineral oil Trafo En with synthetic ester Midel 7131 and natural ester Midel 1204. The measurements were taken in a flow-through system using the pipes made of metal, cellulose and aramid paper. The influence of the liquid flow velocity, the type of material of the measuring pipe and the mixture content on the level of the streaming electrification current generation was determined.

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Tandem-chamber charge density monitor

Cited by 20 publications

References 4 publications

Streaming electrification of mineral insulating oil and synthetic ester MIDEL 7131

Streaming electrification of mineral insulating oil and synthetic ester MIDEL 7131

Electrostatic charge measurement in hydraulic circuits

Archives of Electrical Engineering

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