Limitation of test sample arrangements according to IEC 60243-1: Electrical strength of insulating materials - Test methods

Wels, Sebastian; Obst, Jens; Claudi, Albert; Bottge, Bianca; Bernhardt, Rico; Klengel, Sandy

doi:10.1109/icd.2018.8514634

Cited by 1 publication

(3 citation statements)

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“…Electric breakdown strength is an important property of insulation material for high voltage applications and test procedures to determine the short-term electric strength, as described in ASTM D149 and IEC 60243 [1,2]. In spite of the standards, reliable and meaningful conclusions can be very difficult to draw from the test results [3,4]. Test results are to a great extent dependent on a variety of different test conditions, but one of the main challenges is still to reduce the influence at the triple point between electrodes, test object, and the immersion fluid [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…In spite of the standards, reliable and meaningful conclusions can be very difficult to draw from the test results [3,4]. Test results are to a great extent dependent on a variety of different test conditions, but one of the main challenges is still to reduce the influence at the triple point between electrodes, test object, and the immersion fluid [4][5][6]. Often the breakdowns are triggered by surface discharges at this triple point giving breakdown channels located close to the electrode edges or outside the active electrode area.…”

Section: Introductionmentioning

confidence: 99%

“…In ASTM [7], recommendations how to choose immersion fluid in order to suppress discharges and control the electric field are presented, but this is sometimes of limited use since standard transformer mineral oil or silicone oil is most commonly used. The use of a high permittivity fluid is presented in [4], where a significant increase was detected in electric breakdown strength of a solid material. For XLPE cables it is common to use terminations circulated with deionized water having a permittivity close to 80 or other field grading materials to control the electrical field at the triple point.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Field Grading in Setup for Electric Breakdown Testing of Polyethylene Films

Andersson

Nilsson

et al. 2019

NORD-IS

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High dielectric strength of solid electrical insulation materials for high voltage applications is essential for high reliability and long-term performance.The IEC 60243 and ASTM D149 both describe very similar test methods to determine the short-term electric strength of solid insulation materials. A test sample, usually thin plaque, is placed in an electrode system with surrounding insulating oil. The voltage is then steadily increased until an electric breakdown occurs. Despite the relatively simple test setup, testing materials with high electric strength can be difficult. The breakdown channel is often located outside the active testing area of the electrodes and found at the electrode edge at the triple point between the electrode, test object, and surrounding oil.In this study, we have investigated different possibilities to control the electrical field enhancement in the vicinity of the electrode edges using silicone rubber, field grading silicone rubber, and a high permittivity oil. The testing was performed with semi-spherical electrodes and electrodes as recommended in IEC 60243 on polyethylene films. Electrodes covered with the field grading rubber increased the short-term breakdown strength compared to standard testing without modification. The high permittivity oil and silicone rubber seemed to have limited effect on the breakdown strength.

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Section: Introductionmentioning

confidence: 99%