ANALISIS TAHANAN ISOLASI CURRENT TRANFORMATOR ULTG MADIUN

Prakoso, Tegar (2025) ANALISIS TAHANAN ISOLASI CURRENT TRANFORMATOR ULTG MADIUN. S1 thesis, Universitas PGRI Madiun.

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Abstract

Tegar Prakoso, Analysis of Current Transformator Isolation Resistance at ULTG Madiun. Undergraduate Thesis, Electrical Engineering Study Program, Faculty of Engineering, Universitas PGRI Madiun. Advisors: (1) Irna Tri Yuniahastuti, S.Pd., M.T., (2) Bayu Fandidarma, S.T., M.T. Current Transformator (CT) are critical components in substations, serving to measure current and support protection systems. The performance of CT is heavily influenced by the quality of their insulation, which can degrade due to environmental factors such as humidity, temperature, and equipment aging. This study aims to evaluate the insulation resistance condition of 70 kV CTs at the Magetan, Mranggen, and Caruban Substations. Testing was conducted using an Insulation Tester (Megger) with a 5000 V applied to the primary side and 500 V to the secondary side. The results were analyzed based on IEC 60044-1 and VDE Catalogue 228/4 standards, which set a minimum insulation resistance threshold of 70 MΩ. The findings revealed variations in insulation resistance values across different substations and measurement points. The highest recorded value was 1091 MΩ (primary-ground, phase S) at the Mranggen Substation, while the lowest was 57.8 MΩ (primary-secondary 1, phase S). All secondary-side measurements showed the instrument's maximum reading of 1 GΩ, confirming compliance with insulation standards. This research provides insights into the insulation condition of CTs in different substations, highlighting potential areas for maintenance and further investigation.

Item Type:	Thesis/Skripsi/Tugas Akhir (S1)
Kata Kunci:	Current Transformator; tahanan isolasi; IEC 60044-1; VDE 228/4; Current Transformator; insulation resistance; IEC 60044-1, VDE 228/4
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Fakultas Teknik > Teknik Elektro
Depositing User:	TEGAR PRAKOSO TEGAR
Date Deposited:	01 Oct 2025 05:22
Last Modified:	01 Oct 2025 05:22
URI:	http://eprint.unipma.ac.id/id/eprint/5145

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