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Nattapon Panmala - IEEE Xplore Author Profile

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This paper presents a severity analysis of partial discharge (PD) in rotating machine. The severity analysis technique, based on PD phenomena, amplitude, repetition rate, and gap time distance, was applied to three generators and two motors to investigate the insulation condition. Different PD phenomena represent different severities in the degradation process. PD amplitude and trending illustrate...Show More
in a 115 kV switchyard substation, there are several major equipment that are gradually deteriorated due to ageing and degradation. Those equipment are one of the important element in a power generating utility to supply the reliable electricity to diverse customers. Therefore, their failures would cause catastrophic consequences and lead to long outage time. Thus, the need for condition and perfo...Show More
In this paper, the overall health index of underground cable system is determined using Fuzzy Logic and Scoring and Weighting Average methods. The relevant data of 73 feeders has been collected in the prepared evaluation forms, divided into five major component groups: cable, joint, termination, manhole, and ductbank. In each component, various testing methods and diagnostic techniques are applied...Show More
This paper provides an examination of the impact of lightning strikes on a 220 kV double circuit (D/C) high voltage transmission line in Bhutan. The study employs the ATP-EMTP software to identify the leading causes of transmission line faults, which are primarily attributed to lightning strikes. Since the transmission lines run through areas in Bhutan that are prone to severe weather conditions a...Show More
The problems of high voltage equipment usually come from the imperfection of solid insulation, which may be caused by poor workmanship during cable installation, leading to multi-void inside solid insulation and subsequently partial discharge when that cable is put in service. Therefore, this paper aims to investigate the discharge phenomena of multi-void inside solid insulation by creating artifi...Show More
This paper presents the Partial Discharge (PD) investigation of defective medium voltage (3.6/6(7.2) kV) cable terminations and the impact of using different voltage sources namely AC 50 Hz and Very Low Frequency (VLF) voltage source of 0.1 Hz as supply voltage. The PD is detected by High Frequency Current Transformer (HFCT). Electric field stress investigation is carried out by using Finite Eleme...Show More
This paper presents practical partial discharge (PD) investigation by using mobile acoustic camera with HV and MV equipment in distribution network. Four types of PD are observed including corona discharge at energized electrode with low and high discharge intensity, arcing between live parts or live part with other components as well as surface or internal discharge with their corresponding PD pa...Show More
This paper presents an invisible vapor substance as a bird buffer in HV substation to protect the contamination on insulator. The electrical properties of the insulators after spraying an vapor substance was observed by applying four electrical testings such as leakage current, partial discharge, impulse withstand voltage and insulation resistance tests according to international standards in HV l...Show More
This paper presents the comparison of partial discharge (PD) interpretation on three different standard test objects and defected power cable terminations among an PD acoustic sensor and conventional IEC60270 capacitive PD detection system. The experiments are conducted as off-line testing which is sourced by isolated high voltage step up transformer in laboratory based on safety standard. The res...Show More
This paper presents condition assessment of medium voltage underground cable system. Various testing methods and diagnostic techniques are presented to find a defect of individual underground cable components such as withstand voltage, partial discharge, dielectric loss or tan delta, and visual inspection. Subsequently, technical criteria for condition evaluation is defined. Then condition assessm...Show More
This paper presents a design and implementation of the passive harmonic filter using the simulation tool. The results of the simulation tool are calculated from the various system parameters including transmission line, distribution system, static load, harmonic load, capacitor bank, and passive harmonic filter. The simulation program can be divided the calculations into 2 parts. The first part is...Show More