scholarly journals The Breakdown Voltage Characteristics of Bamboo Insulation under Composite Layer Based

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Lukmanul Hakim ◽  
T. Haryono ◽  
Suharyanto Suharyanto
Keyword(s):  
Breakdown Voltage ◽  
Normal Condition ◽  
Composite Layer ◽  
Dielectric Strength ◽  
Test Sample ◽  
Bamboo Fiber ◽  
Insulation Material ◽  
Insulation System ◽  
Composite Layers ◽  
Test Result

Today, insulation system involves more than one insulation material, whether serial, parallel, or both. In insulation system, the simplest form is composite which consists of two layers of the same material. The benefit of using layered insulation is that the dielectric strength is higher than one layer with the same thickness. There are two methods to test bamboo isolator, i.e., tests of the breakdown voltage of bamboo wall and bamboo fiber. The tests used two methods of composite layers (acrylic and resin) and without composite layer (normal condition). The tests were intended to observe the breakdown voltage on each incidence in each test sample and discover the dielectric strength. The test result showed that the breakdown voltage of bamboo wall was bigger than bamboo fiber with or without composite layer. The highest dielectric strengths of acrylic layer in petung bamboo wall were 2.07 kV/mm and acrylic layer in bamboo fiber was 0.95 kV/mm in layered method. Meanwhile, in ampel bamboo wall it was 1.35 kV/mm and petung bamboo fiber it was 0.43 kV/mm in normal condition (without layer).

scholarly journals Synthesis and Diagnostics of Nanostructured Micaless Microcomposite as a Prospective Insulation Material for Rotating Machines

2019 ◽  
Vol 9 (14) ◽  
pp. 2926
Author(s):  
Jaroslav Hornak ◽  
Václav Mentlík ◽  
Pavel Trnka ◽  
Pavol Šutta
Keyword(s):  
Volume Resistivity ◽  
Dielectric Strength ◽  
Dissipation Factor ◽  
Diglycidyl Ether ◽  
Diagnostic Methods ◽  
Insulation Material ◽  
Rotating Machines ◽  
Polyethylene Naphthalate ◽  
Insulation System ◽  
Treatment Technology

This paper deals with the topic of composite insulation materials for rotating machines and it is primarily pointed to the synthesis of new three-component insulation system. In connection with this research, the basic components of the insulation system are selected and described by different diagnostic methods. The proposed insulation material is composed of epoxy resin based on bisphenol-A diglycidyl ether, magnesium oxide nanofiller (1 wt %) with its own surface treatment technology using epoxysilane coupling agent ( γ -glycidoxypropyltrimethoxysilane) and polyethylene naphthalate as a reinforcing component. Following the defined topic of the paper, the proposed three-component insulation system is confronted with commonly used insulating systems (PET reinforced and Glass reinforced mica composites) in order to verify the basic dielectric properties (dielectric strength, volume resistivity, dissipation factor) and other parameters determined from phenomenological voltage and current signals, respectively.

scholarly journals Virgin coconut oil dielectrical properties as electrical insulation material

2019 ◽  
Vol 8 (3) ◽  
pp. 1154-1161
Author(s):  
Siti Syafiqah Mat Sauki ◽  
Nor Asiah Muhamad ◽  
Zawani Amirah Rasid
Keyword(s):  
Breakdown Voltage ◽  
Kinematic Viscosity ◽  
Coconut Oil ◽  
Renewable Resource ◽  
Dielectric Strength ◽  
Mineral Oil ◽  
Heating Process ◽  
Insulation Material ◽  
Virgin Coconut Oil ◽  
Tropical Country

Mineral oil played an important role as insulating liquid such as to reduce failure, ageing effect, increase the life span and heat transfer agent. Mineral oil had a good dielectric strength and cooling performance but it had serious negative environmental impact like non-biodegradable, non-renewable resource and difficult to dispose when it deteriorates completely. Hence, virgin coconut oil (VCO) was chosen as alternative to replace mineral oil since it biodegrades completely without toxic and easy to get in the tropical country. Three dielectric tests were conducted to investigate the dielectric properties of VCO. Those were breakdown voltage, water content and kinematic viscosity. A study about the effect of the moisture level of VCO on the breakdown voltage and kinematic viscosity was also presented. VCO and mineral oil also undergone heating process to reduce moisture in sample. The study showed that VCO has good potential breakdown voltage with the ability to absorb a lot of moisture keeping the KRAFT paper dry. However, VCO had very high kinematic viscosity compared to mineral oil. Further, the rate of breakdown voltage decreases with increasing of moisture of VCO was lower than mineral oil.

scholarly journals Composite Layers “MgAl Intermetalic Layer / PVD Coating” Obtained On The AZ91D Magnesium Alloy By Different Hybrid Surface Treatment Methods

2015 ◽  
Vol 60 (2) ◽  
pp. 1031-1035 ◽  
Author(s):  
J. Smolik ◽  
A. Mazurkiewicz ◽  
J. Kacprzyńska-Gołacka ◽  
M. Rydzewski ◽  
M. Szota ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Magnesium Alloys ◽  
Surface Engineering ◽  
Composite Layer ◽  
Electron Beam Evaporation ◽  
Treatment Technology ◽  
Corrosion Properties ◽  
Pvd Coating ◽  
Composite Layers ◽  
Coating Composite

Abstract Magnesium alloys have very interesting physical properties which make them ‘materials of the future’ for tools and machine components in many industry areas. However, very low corrosion and tribological resistance of magnesium alloys hampers the implementation of this material in the industry. One of the methods to improve the properties of magnesium alloys is the application of the solutions of surface engineering like hybrid technologies. In this paper, the authors compare the tribological and corrosion properties of two types of “MgAlitermetalic / PVD coating” composite layers obtained by two different hybrid surface treatment technologies. In the first configuration, the “MgAlitermetalic / PVD coating” composite layer was obtained by multisource hybrid surface treatment technology combining magnetron sputtering (MS), arc evaporation (AE) and vacuum heating methods. The second type of a composite layer was prepared using a hybrid technology combined with a diffusion treatment process in Al-powder and the electron beam evaporation (EB) method. The authors conclude, that even though the application of „MgAlitermetalic / PVD coating” composite layers can be an effective solution to increase the abrasive wear resistance of magnesium alloys, it is not a good solution to increase its corrosion resistance.

scholarly journals Examination of dielectric strength of thin Parylene C films under various conditions

2016 ◽  
Vol 2 (1) ◽  
pp. 39-41 ◽  
Author(s):  
Andreas Heid ◽  
Rene von Metzen ◽  
Alfred Stett ◽  
Volker Bucher
Keyword(s):  
Breakdown Voltage ◽  
Saline Solution ◽  
Dielectric Strength ◽  
Parylene C ◽  
Biocompatible Polymer

AbstractThe breakdown voltage of the biocompatible polymer Parylene C was determined after storage in 60°C saline solution and treatment by autoclave. It occurred that both, storage at 60°C in saline solution and autoclaving, lead to distinct decrease of dielectric strength by approximately 50%.

scholarly journals Design and Verification of a Deep Rock Corer with Retaining the In Situ Temperature

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Zhiqiang He ◽  
Heping Xie ◽  
Mingzhong Gao ◽  
Ling Chen ◽  
Bo Yu ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Heat Dissipation ◽  
Electric Heating ◽  
Transfer Model ◽  
Hollow Glass Microsphere ◽  
Insulation Material ◽  
Insulation System ◽  
Deep Rock ◽  
Active Thermal Insulation

Deep rock is always under high-temperature conditions. However, traditional coring methods generally have no thermal insulation design, which introduces large deviations in the guidance required for resource mining. Thus, a thermal insulation design that utilizes active and passive thermal insulation was proposed for deep rock corers. The rationale behind the active thermal insulation scheme was to maintain the in situ core temperature through electric heating that was controlled by using a proportional-integral-derivative (PID) chip. Graphene heating material could be used as a heating material for active thermal insulation through testing. In regard to the passive thermal insulation scheme, we conducted insulation and microscopic and insulation effectiveness tests for hollow glass microsphere (HGM) composites and SiO2 aerogels. Results showed that the #1 HGM composite (C1) had an excellent thermal insulation performance (3 mm thick C1 can insulate to 82.6°C), high reflectivity (90.02%), and wide applicability. Therefore, C1 could be used as a passive insulation material in deep rock corers. Moreover, a heat transfer model that considered multiple heat dissipation surfaces was established, which can provide theoretical guidance for engineering applications. Finally, a verification test of the integrated active and passive thermal insulation system (graphene heating material and C1) was carried out. Results showed that the insulating effect could be increased by 13.3%; thus, the feasibility of the integrated thermal insulation system was verified. The abovementioned design scheme and test results provide research basis and guidance for the development of thermally insulated deep rock coring equipment.

Abrasion resistance of Ni-B/Si3N4 composite layers produced by electroless method

2017 ◽  
Vol 1 (87) ◽  
pp. 21-26 ◽  
Author(s):  
A. Mazurek ◽  
G. Cieślak ◽  
W. Bartoszek ◽  
M. Trzaska
Keyword(s):  
Steel Substrate ◽  
Composite Layer ◽  
Substrate Material ◽  
Dispersion Phase ◽  
Si3n4 Powder ◽  
Composite Layers ◽  
Surface Development ◽  
Silicon Nitride Powder ◽  
Wear Damage ◽  
Powder Content

Purpose: The paper presents the results of investigations of Ni-B/Si3N4 composite layers produced on steel substrate by electroless method. Design/methodology/approach: Amorphous silicon nitride powder (Si3N4) with nanometric particle sizes was used as a dispersion phase for the production of composite layers. Ni-B/Si3N4 composite layers were produced in baths of varying Si3N4 powder content. For comparative purposes, the study also includes results related to a Ni-B layer. The Si3N4 powder and the structure of the produced layers were characterized. The topography and morphology of the surface of the produced layers are presented. The adhesion of the layers to the substrate material was determined. Microhardness and tribological properties of test materials were determined. Findings: The results of the studies show that Ni-B/Si3N4 composite layers and Ni-B composite layers are characterized by compact structures and good adhesion to the substrate material. The incorporation of Si3N4 particles into the Ni-B layers increases the degree of surface development of the layers. The Ni-B/Si3N4 composite layer material exhibits less microhardness and less abrasive wear compared to Ni-B layers. However, the extent of wear damage of the Ni-B/Si3N4 is relatively small comparing to Ni-B layers.

Sign in / Sign up

Export Citation Format

Share Document