Characterisation of Partial Discharge Pattern in Generator Stator due to Combination of Internal and External Insulation Defects

Hulfana, Taris Zihni (2025) Characterisation of Partial Discharge Pattern in Generator Stator due to Combination of Internal and External Insulation Defects. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

This study aims to analyze the characteristics of Partial Discharge (PD) patterns in generator stators caused by a combination defect of internal and external insulation. Three types of combination defects were modeled, such as slot discharge with void discharge, slot discharge with delamination discharge, and corona discharge with void discharge. The test methods include insulation resistance (IR), Partial Discharge Inception Voltage (PDIV), and Phase Resolved Partial Discharge (PRPD) analysis. In the normal condition, the stator bar exhibited a high insulation resistance of 917 GΩ with a Polarization Index (PI) of 2,16 and Dielectric Absorption Ratio (DAR) of 1,46. The PDIV averaged 6,61 kV. In contrast, defect bars showed significantly lower IR and PDIV values. The lowest PDIV was found in the combination defects of slot discharge and delamination discharge at 1,79 kV. PRPD pattern analysis revealed distinctive shapes for each condition. The normal condition produced a symmetrical, semi-circular pattern with minimal intensity. The combination defects of slot discharge and void discharge generated an asymmetrical with triangular and half circle shape, indicating uneven PD activity between voltage cycles. The combination defects of slot discharge and delamination discharge displayed a wide, high-intensity symmetrical pattern with triangular and square shape. Meanwhile, the combination defects of corona discharge and void discharge showed an asymmetrical triangular and half circle shape, with stronger PD activity in the negative cycle

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Partial Discharge, PRPD, PDIV, Insulation Defects, Generator Stator
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3401 Insulation and insulating materials T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7 Turbogenerators. Steam-turbines
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Taris Zihni Hulfana
Date Deposited:	24 Jul 2025 04:43
Last Modified:	24 Jul 2025 04:43
URI:	http://repository.its.ac.id/id/eprint/121074

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