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Pandian, G.
- Study on Steep Front Impulse Test Voltage Value of Disc Insulators with Variation in the Number of Units of Insulator String
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Authors
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1 High Voltage Division, CPRI, Bangalore - 560080, Karnataka, IN
1 High Voltage Division, CPRI, Bangalore - 560080, Karnataka, IN
Source
Power Research, Vol 18, No 2 (2022), Pagination: 127-132Abstract
The insulators used in power transmission and distribution networks should withstand abnormal system-generated switching impulses and natural lightning impulses. To avoid the failure of insulators in the field, the impulse puncture strength evaluation of the ceramic insulators is important. IEC 61211 standard stipulates the procedure to evaluate the ceramic disc insulators’ strength to withstand steep front impulses. In this test, the test voltage is determined by using a short standard string of five insulators. This paper presents the variation in the impulse stresses across the disc insulator units in the string due to non-linear voltage distribution under impulse flashover. This paper also correlates the test voltage values defined by the IEC standard with the highest stress on insulator units under impulse flashover of string insulators by using voltage distribution. The correlation study has been carried out with insulator strings having different arcing distances by using a different number of units.Keywords
Cap and Pin Insulator, Lightning Critical Flashover Voltage, Test Voltage (2.8pu), V-t Characteristics, Voltage Distribution.
References
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- Marimuthu K, Vynatheya S, Vasudev N, Raja P. Quality analysis of ceramic insulators under steep front impulse voltage. IEEE- 20th National Power System Conference; 2018 Dec. https://doi.org/10.1109/NPSC.2018.8771717 DOI: https://doi.org/10.1109/NPSC.2018.8771717
- A report of CIGRE Task Force 33.07.01 - Puncture testing of ceramic and glass insulators.
- Gorur RS, Cherney EA, Burnham JT. Outdoor Insulators. Phoenix, Arizona: Ravi S. Gorur, Inc; 1999.
- IEC 61211: 2004, Insulators of ceramic material or glass for overhead lines with a nominal voltage greater than 1000 V- Impulse puncture testing in air; 2004.
- Kuffel E, Zaengl WS, Kuffel J. High voltage engineering: Fundamentals. 2nd ed. Newnes; 2000 Aug.
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- IEC 60071-2. Insulation co-ordination- Part 2: Application Guide. 3rd ed; 1996 Dec.
- IEC 60060-1. High-voltage test techniques- Part 1: General definitions and test requirements, 3rd ed; 2010 Sep.
- Gorur RS, Cherney EA, Burnham JT. Outdoor insulators. Phoenix, Arizona: Ravi S. Gorur, Inc; 1999.
- Kontargyri VT, Gonos IF, Stathopoulos, Michaelides M. Measurement and verification of the voltage distribution on high voltage insulators. 12th Biennial IEEE Conference on Electromagnetic Field Computation; 2006, pp. 326-32.
- Experimental Analysis of Ceramic Insulators with Different Profiles Under Very High Pollution Zone by Solid Layer Method
Abstract Views :128 |
PDF Views:0
Authors
Affiliations
1 High Voltage Division, Central Power Research Institute, Bengaluru, IN
1 High Voltage Division, Central Power Research Institute, Bengaluru, IN
Source
Power Research, Vol 18, No 2 (2022), Pagination: 133-138Abstract
The outdoor insulators in service are exposed to marine, agricultural waste and industrial pollution. These pollutants get deposited on the insulator surface and lead to flashovers under fog conditions. There has been an abnormal increase in pollution levels due to rapid industrialization in the past two decades. This exponential increase in pollution levels causes frequent flashovers of insulators, leading to the tripping of transmission lines consecutively may result in blackouts, which severely affects the reliability of the power systems. The ESDD and NSDD measurement on the insulator surface are critical parameters for determining the pollution severity levels. This paper discusses ESDD and NSDD measurement procedures. In this paper, field pollution severity has been simulated in the Artificial Pollution Lab. In addition, the Non-Soluble Deposit Density (NSDD) component of pollutants for designing the creepage distance of ceramic insulators under heavy pollution conditions has been emphasized.Keywords
Creepage Distance, ESDD, NSDD.References
- Holtzhausen JP, Vosloo WL. The pollution flashover of ac energized post type insulators. IEEE Transactions on Dielectrics and Electrical Insulation. 2001; 8(2):191-194. https://doi.org/10.1109/94.919925 DOI: https://doi.org/10.1109/94.919925
- Rahal AM, Huraux C. Flashover mechanism of high voltage insulators. IEEE Transactions on Power Apparatus and Systems. 1979 Nov; PAS-98(6):2223-2231. https://doi.org/10.1109/TPAS.1979.319421 DOI: https://doi.org/10.1109/TPAS.1979.319421
- Muhsin T, Mehmet C. The pollution flashover on high voltage insulators. Electric Power Systems Research. 2008; 78:1914-1921. https://doi.org/10.1016/j.epsr.2008.03.019 DOI: https://doi.org/10.1016/j.epsr.2008.03.019
- IEC Technical Specification 60815-2, Selection and dimensioning of high-voltage insulators intended for use in polluted Conditions-Part 1: ceramic and glass insulators for a.c. systems; 10 2008.
- IEC Technical Specification 60815-1, Selection and dimensioning of high-voltage insulators intended for use in polluted Conditions-Part 1: ceramic and glass insulators for a.c. systems; 10 2008.
- CIGRE WG C4.303- Outdoor insulation in polluted conditions: Guidelines for Selection and dimensioning - Part 1: General principles and the a.c. case, CIGRE Technical Brochure N° 361; 2008
- Sundararajan R, Gorur RS. Role of non-soluble contaminants on the flashover voltage of porcelain insulators. IEEE Transactions on Dielectrics and Electrical Insulation. 1996; 3(1):113-118. https://doi.org/10.1109/94.485522 DOI: https://doi.org/10.1109/94.485522
- IEC-60507, Artificial pollution tests on high-voltage ceramic and glass insulators to be used on a.c. systems; 2013.
- RDSO’s Special Maintenance Instruction (SMI) to measure the severity of pollution by brush wash method. Specification No. TI/MI/040, Rev.0, dated: 05/04/2005