PDC measurements to assess machine insulation

David, Éric; Soltani, Reza; Lamarre, L.

doi:10.1109/tdei.2010.5595547

Cited by 39 publications

(15 citation statements)

References 14 publications

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“…The absorption current results from molecular and electron drift and current decay overtime when voltage is applied. The amount and character of decay are determined by the type and bonding material condition in the insulation system [4][5][6][7][8][9][10][11].…”

Section: Background Theorymentioning

confidence: 99%

The Investigation of Insulation Performance Evaluation of the Large Electrical Rotating Machine in Frequency Domain

Phloymuk

Kando

Pattanadech

2020

JMM

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The insulation structure of winding in a large electrical rotating machine consists of epoxy resin and mica material. The insulation structure is composed of many junctions. The insulation problems generate different kinds of signals, such as electromagnetic waves, which may get released from the non-perfect characteristics of the enclosure. This signal may interfere with the functioning of other nearby electronic devices. Therefore, maintaining an excellent condition of the insulation system of the machine is very important. For a condition monitoring of this insulation as proposed in this research, it is taken into consideration the results of the polarization and depolarization current (PDC) measurement of the test sample, and the stator winding rated 13.8 kV was investigated. The experiments were conducted under different thermal stresses, i.e., 25°C (the room temperature) and 100°C (the operation temperature). The test samples were divided into three types: I. haft-overhang, II. overhang and III. full stator bar. From the PDC measurement data record, the complex capacitance and polarization losses (ion migration polarization, slow relaxation polarization and interfacial polarization) were calculated. It was found that the aging of the insulation related to the complex capacitance and polarization losses can be contributed for research in future wireless technology.

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Section: Background Theorymentioning

confidence: 99%

The Investigation of Insulation Performance Evaluation of the Large Electrical Rotating Machine in Frequency Domain

Phloymuk

Kando

Pattanadech

2020

JMM

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“…A significant amount of information has been published on the use of Polarization Depolarization Current (PDC) testing for the evaluation of insulation systems [5][6][7][8]. There are several schools of thought that look at either just PDC or a combination of PDC and Dielectric Dissipation Factor (DDF) and Capacitance (C).…”

Section: Polarization Depolarization Currentmentioning

confidence: 99%

“…In the case of PDC, it is useful in the detection of moisture absorption and contamination, uncured insulation systems, and brittle insulation systems in larger form-wound machines [7], [8]. The traditional evaluation is performed using a log-log system, which is not available as part of the LTSpice simulator being used in this study.…”

Section: Polarization Depolarization Currentmentioning

confidence: 99%

Simulating insulation discharge processes in the laboratory

McKinnon¹,

Penrose²,

Frost³

2013

2013 IEEE Electrical Insulation Conference (EIC)

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A significant amount of research has been published in recent years on Polarization -Depolarization Currents (PDC), although little has been published on simulating these processes in the laboratory. In this paper we will provide summary results of simulations performed on the discharge process of insulation systems and comparing them to results provided by PDC monitoring. We will examine the effects of changing various parameters such as leakage resistance-to-ground, capacitance-toground, and absorption current branches as shown in the standard insulation system models. We will also provide a summary of results encountered when various elemental effects such as moisture and contamination are incorporated into the system models.

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“…Fro m the measurements of polarization and depolarizat ion currents, it is possible to estimate the dc conductivity σ, of the test object. If the test object is charged for a sufficiently long time so that ( + ) ≅ 0, equation (2) and equation (3) can be combined to express the dc conductivity of the composite dielectric as [1,14,16,18,19]: When a totally discharged insulation is exposed to a fixed DC voltage, a resultant current will be produced from acti-Water content…”

Section: Insulati On Conducti Vity Conce Ptmentioning

confidence: 99%

“…It also can be determined by the ageing process of the insulations PDC measurement will use DC so u rce u p to 2000 Vd c as th e inpu t sou rce and th is measurement can be classified as DC testing. DC testing is probably the most commonly used maintenance and diagnostic tests periodically conducted on machine stator insulation systems with the commercial availability of mo re sophisticated equipment to continuously monitor both charge and discharge current during a step voltage test, also known as polarization/depolarization current (PDC) test [2,3]. PDC test had been applied to many electrical apparatus to monitor the condition such as machine stator, transformer and power cables.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Conductivity Using Polarization and Depolarization Current (PDC) Test

Jamail¹,

Piah²,

Muhamad³

2012

EEE

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Polarization and Depolarization Current (PDC) testing is a non-destructive dielectric testing method to determine the conductivity of insulations. It is one of the dielectric d iagnostic techniques based on time do main measurement. PDC measurement technique has gained immense popularity due to its ability to assess the condition of HV insulation. PDC measurement can provide information about the conductivity within the init ial periods (seconds) after a DC step voltage application. This paper present the review and comparison results from several published papers on application of PDC method in finding the conductivity of the various types of insulators. The scope of the review covered solid and liquid insulations types. In this paper, for solid insulation the studied was focused on cables insulations, electric machine stator insulation and paper insulator in power transformer insulation. Fo r liquid insulation, the review and comparison was done on the biodegradable and mineral transformer o ils. MATLA B software was used to simulate the conductivity level of the several types of HV insulation material. The conductivity level of insulation was found dependent on difference between the polarization and depolarization current values of the insulation material. The review results show that the PDC technique successfully give indication on level o f conductivity of the HV insulation materials.

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PDC measurements to assess machine insulation

Cited by 39 publications

References 14 publications

The Investigation of Insulation Performance Evaluation of the Large Electrical Rotating Machine in Frequency Domain

The Investigation of Insulation Performance Evaluation of the Large Electrical Rotating Machine in Frequency Domain

Simulating insulation discharge processes in the laboratory

Comparative Study on Conductivity Using Polarization and Depolarization Current (PDC) Test

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