Time domain measurements of dielectric response in oil-paper insulation systems

Houhanessian, V. Der; Zaengl, W.S.

doi:10.1109/elinsl.1996.549280

Cited by 77 publications

(52 citation statements)

References 6 publications

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“…This method can also help to monitor ageing and moisture ingress, once the models are formed from the measurements. w x Der Hohuanesian et al 69 show that consecutive measurements of the polarisation currents of an oilrpaper insulation system can be used to quantify its dielectric response, especially in the low frequency domain. The authors suggest that polarisation spectra as quantified by RV measurements should not be used to quantify the moisture content of the pressboard within a power transformer of unknown construction, as the dielectric response quantities of the board are only a portion of the overall rew x sponse.…”

Section: ä 4 ž De Polar I Sation O 0 Ch Ar G I N Gmentioning

confidence: 99%

Review of modern diagnostic techniques for assessing insulation condition in aged transformers

Saha

2003

IEEE Trans. Dielect. Electr. Insul.

633

244

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Cellulosic paper and oil insulation in a transformer degrade at higher operating temperatures. Degradation is accelerated in the presence of oxygen and moisture. Power transformers being expensive items need to be carefully monitored throughout its operation. Well established time-based maintenance and conservative replacement planning is not feasible in a current market driven electricity industry. Condition based maintenance and online monitoring are now gaining importance. Currently there are varieties of chemical and electrical diagnostic techniques available for insulation condition monitoring of power transformers. This paper presents a description of commonly used chemical diagnostics techniques along with their interpretation schemes. A number of new chemical techniques are also described in this paper. In recent times a number of electrical diagnostic techniques have gained exceptional importance to the utility professionals. Among these techniques polarisationr r r r rdepolarisation current measurement, return voltage measurement and frequency domain dielectric spectroscopy at low frequencies are the most widely used. This paper describes analyses and interpretation of these techniques for transformer insulation condition assessment.

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Section: ä 4 ž De Polar I Sation O 0 Ch Ar G I N Gmentioning

confidence: 99%

Review of modern diagnostic techniques for assessing insulation condition in aged transformers

Saha

2003

IEEE Trans. Dielect. Electr. Insul.

633

244

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“…Traditional methods, such as insulation resistance, absorption or polarization coefficient, measurements of the dielectric loss angle tgδ, have become classical non-destructive diagnostic methods [5], [6]. The measurement of insulation resistance is based on measuring resistance by temporarily using voltage for up to one minute.…”

Section: Insulation Diagnosticsmentioning

confidence: 99%

“…This approach was initially offered for an operating mode where the sum of capacities in different modes was calculated for a series of power systems of ships with a voltage of up to 1000 V. The results of these calculations are also used in operating modes [8]. This diagnostic test presents a known way of assessing the cable condition [5]. To minimize the possibility of incorrect measurements during the installation, it is necessary to pay attention to the measuring instruments.…”

Section: Insulation Diagnosticsmentioning

confidence: 99%

Ship Power System Analysis Based on Safety Aspects

Urbaha

Krizus

Kreisberg³

2017

Transport and Aerospace Engineering

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-This article analyses the reasons for the reduction of insulating resistance, processes influencing them and isolation diagnostic methods. It provides a short description of electrical safety situation on ships with isolated neutral electrical power systems. It also covers the methods of protecting personnel from electric shock or preventing ignition or arching damage at the fault location with the help of fault current compensation. Principal fault current compensation circuit diagrams are analysed by using the minimum value and time of transient fault current as criteria.

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“…It has been widely accepted that a change in oil conductivity and moisture in the insulation has an immense effect on the elements of the RC circuits. PDC analysis has also been further strengthened by measurements on models and well controlled impregnated paper/pressboard insulation samples [12]. In field applications, eliminating the influence of noise current is one of the key issues associate with PDC measurements.…”

Section: Introductionmentioning

confidence: 99%