Pattanadech, Norasage

Preferred name

Alternative Name

Pattanadech, N.

Main Affiliation

School of Engineering

norasage.pa@kmitl.ac.th

Now showing 1 - 10 of 12

Some of the metrics are blocked by your
consent settings
Experience in Partial Discharge Investigation of a 155 MVA Air-Cooled Generator
(2024-01-01)
Pathanrat, Khomsan
;
Chumpiboon, Komin
;
Jeenmuang, Siwakorn
;
Worthong, Tehneht
;
Pannil, Pittaya
This paper presents the Partial Discharge (PD) and Polarization and Depolarization Current (PDC) investigation for a 155 MVA air-cooled generator. The visual inspection of the stator winding insulation was carried out during the annual preventive maintenance. Several defects in the area of the end winding stator were evidenced. Thereafter, the refurbishment of these problems was performed to improve the stator winding insulation condition, and the offline PD & PDC test was conducted accordingly. Besides, the online PD was continuously monitored, through capacitive PD sensors which have been installed on the terminal of the generator two units per phase. The operating conditions during online PD measurement were also recorded. In this paper, the results from both offline and online PD measurements were presented.
Some of the metrics are blocked by your
consent settings
The Effect of Surface Leakage Current on Frequency Domain Spectroscopy of 22 kV OIP Bushing
(2024-01-01)
Rojanasunan, Warisanan
;
Chumpiboon, Komin
;
Udomluksananon, Patt
;
Jeenmuang, Siwakorn
;
Chancharoensook, Phop
In this paper the dielectric response in frequency domain or frequency domain spectroscopy (FDS) is used to assess the effect of surface leakage current both from high voltage side and ground side on the FDS results of OIP bushings. The test object in this paper is a 22 kV OIP bushing which is out of service. The surface leakage current can be simulated using the copper tape as a bandage around the bushing core in several locations. From the FDS results, several parameters i.e., dissipation factor, capacitance, and capacitance ratio together with frequency scanning of capacitance and dissipation factor from many cases were investigated to get the fundamental knowledge of how to interpret the FDS result of OIP bushing.
Some of the metrics are blocked by your
consent settings
Investigation of Dielectric Response in a 22/0.4 kV Distribution Transformer: Effects of Moisture Content
(2024-01-01)
Daengdee, Danaiwat
;
Bunlaksananusorn, Chanin
;
Suksawat, Dusit
;
Chumpiboon, Komin
;
Jeenmuang, Siwakorn
Transformers play a crucial role in power systems, ensuring efficient energy transmission and distribution. This research focuses on a 22/0.4 kV transformer decommissioned after over 20 years of service. The study involves draining the transformer oil completely and refilling it with oil characterized by known moisture content and breakdown voltage levels until reaching normal operating conditions. The objective is to study the effects of increased moisture content on the dielectric response within the actual structure of the transformer. Diagnostic measurement techniques, including Frequency Domain Spectroscopy (FDS) and Polarization Depolarization Current (PDC), are utilized to evaluate the insulation condition of the transformer. FDS provides information on the dielectric response over a wide frequency range, while PDC assesses the polarization and depolarization behavior of the insulation material. These techniques offer valuable information on the ageing and moisture content of the insulation. The experimental results will be presented and discussed in this paper.
Some of the metrics are blocked by your
consent settings
The Dielectric Properties in Frequency Domain of the 22 kV Underground Cables with Defective Joint
(2023-01-01)
Udomluksananon, Patt
;
Jeenmuang, Siwakorn
;
Chumpiboon, Komin
;
Dorkmai, Kritsada
;
Rojanasunan, Warisanan
The failure that occurs in the underground cable systems leads to losses in many aspects, not only in the power system but also in the commercial and business. The most failure location in medium voltage underground cable systems is cable joint and cable termination, where the defects occur from poor workmanship. This paper represents the mean to investigate the dielectric properties of the 22 kV XLPE underground cable system to assess the insulation's integrity of the underground cable system. In the experiments, the underground cable system specimens were prepared by simulating the defects in cable joints, i.e., the iron powder on the XLPE surface and the incision on the XLPE surface; moreover, the underground cable system with the healthy condition joint was prepared to represent the new (or unused) underground cable system. To compare the dielectric properties in the frequency domain of the 22 kV underground cable systems with defective joints and the healthy condition joint, the frequency domain spectroscopy (FDS), the off-line non-destructive test, was performed in this research. From the test results, the dielectric dissipation factor shows a significantly different value in the case of iron powder when compared with the healthy condition joint. It reveals the loss peak on the curve at a frequency of 1 Hz. However, the case of incision on the XLPE surface is almost similar to the healthy condition case. The real part of the complex capacitance of all three cases has a constant value in the measured frequency ranges using the log-log scale. However, the imaginary part capacitance shows the distinct value of all three cases, of which the trends are the same as the dielectric dissipation factor curve.
Some of the metrics are blocked by your
consent settings
Partial Discharge Investigation of 22kV Distribution Transformer
(2024-01-01)
Dechothamsathit, Vorawut
;
Pannil, Pittaya
;
Yamsiri, Thummanoon
;
Chumpiboon, Komin
;
Jeenmuang, Siwakorn
This paper presents an off-line partial discharge (PD) experiment conducted on a 22 kV/400 V distribution transformer, which was decommissioned after 20 years of service. The study investigates the impact of reduced oil levels within the transformer on PD characteristics that are expected to facilitate PD activity within the transformer. The experiments were performed with reduced oil levels below the top clamp and using both single-phase and three-phase voltage excitations, with PD measurements recorded for each case. The PD signals were measured using High-Frequency Current Transformers (HFCTs) and capturing current pulses of PD in the frequency range of 100 kHz to 20 MHz. Additionally, transformer oil tests were performed, including moisture content, oil breakdown voltage, and oil conductivity. The results of the PD measurements and oil tests are introduced and discussed in this paper.
Some of the metrics are blocked by your
consent settings
THE DIELECTRIC CHARACTERISTICS OF 22 KV XLPE UNDERGROUND CABLES WITH DEGRADED ARTIFICIAL JOINT
(2023-01-01)
Udomluksananon, Patt
;
Boonsaner, Nutthaphan
;
Wiangtong, Theerayod
;
Jeenmuang, Siwakorn
;
Chumpiboon, Komin
This paper represents the dielectric characteristics of the 22 kV underground cable test specimen. Two 3 m XLPE underground cables were connected with the heat-shrinkable joint that has been simulated with some artificial defects. The healthy heat-shrinkable terminations are at both ends of the cable test specimen. For this research, the underground cables with the healthy joint, the joint with a copper powder contaminant on the XLPE surface, and the joint with an incision on the XLPE surface were prepared to perform the experiment. To compare the dielectric characteristics of the underground cables with the healthy joint and degraded artificial joints, the polarization and depolarization currents (PDC) measurements and the very low frequency-tangent delta (VLF-TD) testing, according to IEEE standard 400.2-2013, were conducted. From the PDC measurements, the test results are not clearly different for the underground cables with the defective joint when compared to the healthy joint case, except for the electrical conductivity and insulation resistance that show the difference between them. The VLF tangent delta parameters and mean tangent delta comparison curve show differences in each case, which can contribute to assessing the condition of the underground cable systems.
Some of the metrics are blocked by your
consent settings
INVESTIGATION OF STATOR WINDING INSULATION CONDITION OF MV MOTORS BASED ON DIELECTRIC RESPONSE MEASUREMENT
(2023-01-01)
Pattanadech, Norasage
;
Jeenmuang, Siwakorn
;
Dorkmai, Kritsada
;
Chumpiboon, Komin
;
Udomluksananon, Patt
This paper presents an investigation of the stator winding insulation condition of medium voltage (MV) motors operated in a power plant. The investigated motors have the same voltage rate of 6.6 kV. Such motors continuously encounter various stresses during service which alter the dielectric properties of the insulation system. Thus, the dielectric response measurement (DRM) was utilized in this research to evaluate the integrity of insulation of stator winding insulation, whether the bulk insulation e.g., moisture absorption, or the surface insulation e.g., existing conductive contamination over- or even moisture adsorption along the endwiding surface. In addition, polarization and depolarization current (PDC) and frequency domain spectroscopy (FDS), as techniques based on DRM, were employed to allow the analysis in both time and frequency domains. Such techniques were performed on the whole MV motors during the shutdown for time-based maintenance, both before and after cleaning and drying for comparison purposes. The visual inspection of such motors evidences that there has considerable dust over the endwinding surface. Such motors were thus thoroughly cleaned to remove such visible dust over the surface of the endwinding. Then, the DRM test results before and after cleaning, were comparably analyzed to characterize the dielectric properties due to such contaminant. Therefore, the effect of the contaminants on the dielectric properties of the stator winding insulation system is introduced and discussed.
Some of the metrics are blocked by your
consent settings
Physical and chemical properties’ comparison of natural ester and palm oil used in a distribution transformer
(2023-03-01)
Kittikhuntharadol, Yannaphol
;
Pattanadech, Norasage
;
Maneerot, Sakda
;
Jongvilaikasem, Korraya
;
Jariyanurat, Kittipod
Because of its low cost and suitable qualities, mineral oil (MO) has been commonly employed in transformers. Alternative liquid insulations with great characteristics have recently been presented. Natural ester (NE) and palm oil (PO) are considered alternative liquid insulations. This paper aims to study the physical and chemical properties of NE and PO which were used in a transformer for 21 months. All of the liquid insulation test specimens were sampled every 3 months. Physical properties of the liquid insulation, i.e., interfacial tension (IFT), viscosity, and particles count, were examined. Chemical properties of the liquid insulation, i.e., moisture content, acidity, corrosive sulfur, and furanic compound (2-FAL), were investigated. IFT, particles count, moisture content, acidity, and 2-FAL test results indicated deterioration of liquid insulations of the used liquid insulation; however, there is no observation change for particles amount and acidity of NE. The other test results were not found significantly change.
Some of the metrics are blocked by your
consent settings
Effect of Sheath Current on the Lead Sheath of 115kV XLPE Underground Cable
(2024-01-01)
Jariyanurat, Kittipod
;
Jeenmuang, Siwakorn
;
Chumpiboon, Komin
;
Kerdmanee, Sittipong
;
Lacharochana, Sakda
Currently, underground cable systems are extensively employed in power generation and distribution due to their superior reliability, stability, and safety. Given the significant investment and critical role of these systems, it is essential to rigorously assess their lifetime and performance. Key factors affecting the lifespan and life assessment of underground cables include the insulation system and the physical components of the power cable. Among these, sheath current is a notable factor that contributes to cable deterioration. This paper investigates the impact of prolonged sheath current on XLPE power cables, which have been in operation for approximately 25 years, associated with a 115kV generator unit. Specifically, the study focuses on the degradation of the lead sheath due to sheath current exposure. It was observed that the lead sheath exhibited signs of degradation, including tracking, which affected various layers, such as the lead sheath itself, the semi-conductive tape, and the semi-insulation. The research highlights that while sheath current did lead to observable tracking on the lead sheath, the overall impact on the cable's lifetime was minimal. An analysis of the lead sheath's properties, based on fundamental physical characteristics, revealed that long-term exposure to sheath current primarily caused minor physical tracking on the sheath's surface rather than significantly affecting its lifespan. This finding suggests that although sheath current can induce localized degradation, its effect on the overall functional longevity of the lead sheath is relatively limited.
Some of the metrics are blocked by your
consent settings
Off-line and On-line Automatic and Unsupervised Partial Discharge Diagnostics of Electrical Asset Components
(2024-01-01)
Pattanadech, Norasage
;
Jeenmuang, Siwakorn
;
Udomluksananon, Patt
;
Chumpiboon, Komin
;
Shafiq, Muhammad
This paper deals with applications of an innovative approach to on-line and off-line partial discharge (PD)-based condition maintenance, where PD detection and analytics are fully automatic and do not require the support of PD experts. PD was measured off-line on a 50 kV A, 22/0.4 kV distribution transformer and on 115 and 230 kV transformer bushings, showing in both cases that PD can be detected and analyzed automatically according to the SID (Separation, Recognition, Identification) procedure. On-line measurements performed on MV generators are also reported and discussed, highlighting that there is potential for on-line MV (and HV) monitoring with automatic and unsupervised noise rejection, and identification of PD phenomena that can feed health assessment software to reach optimized maintenance plans.

Pattanadech, Norasage

Filters

Settings

Sort By

Results per page