Protection Of Electronic Equipment Research Articles

Power Quality in a University Campus: The User´s Perspective.

This paper presents preliminary results from a power quality audit conducted at a university’s campus over last year. Voltage and current were measured at various academic buildings; it was found that the main problems for the equipment installed were voltage sags and surges. These phenomena are purely random in nature. The paper examines the causes and effects of power disturbances that affect computer or any other microprocessor based equipment and analyses the auto-protection capabilities of modern power supplies. The convenience of “enhanced power supply” or “low-cost customer-side” protection solutions is also discussed. Finally it is addressed the role of the Standards on the protection of electronic equipment and the implications for the final costumer.

Reducing the Specular Properties of Metalized Teflon Coverings on Canadian Mobile Servicing Station on the International Space Station

A surface modification process was developed for the metalized Teflon coverings used for thermal protection of electronic equipment on the International Space Station [1]. The developed modification process of Teflon surfaces reduced substantially the specularity of Ag-Inconel coated Teflon thermal control films by changing the morphological appearance of their surfaces by ion-beam texturing in a controlled manner from a metallic-like and shiny to complete milky, white appearance without significantly affecting the thermal optical properties.
 A number of space hardware units covered with the textured Silver-Teflon were exposed to the open space environment between June 2002 and June 2006 and delivered back to Earth at the end of 2006. Remarkable performance was demonstrated by the treated Ag/Teflon, with the solar absorptance and total emittance values and the α/ε ratio remaining very close to the original values as measured before the flights [2].
 In an attempt to protect further the textured surfaces of Teflon from possible erosion by atomic oxygen and VUV in LEO environment, an additional novel surface modification process was developed that created an SixOyCzFn type of structure on the treated surface. The textured Teflon samples before and after surface treatments were tested in a space simulator facility under a combined atomic oxygen/vacuum ultraviolet exposure. A number of advanced characterization techniques were used to evaluate the properties of the modified films [3].

Safety audit analyse – A case study report in printing machinery firm

A Quality electrical power supply must be available at all times, always within the frequency and magnitude tolerance limits, and always with a perfectly sinusoidal waveform. A reliable, efficient and safe power supply is essential for guaranteeing productivity and precision in any organisation. Energy cum safety audit helps in energy cost optimization, pollution control, safety aspects and suggest the method to improve the operating and maintenance. This paper presents preliminary results from a power quality and safety audit conducted at a industry building. Voltage and current were measured at various feeders; it was found that the main problems for the equipment installed were voltage sags, surges and more THD levels than normal levels. The paper examines the causes and effects of power disturbances that affect the printing machines and other microprocessor-based equipment and analyzes the auto-protection capabilities of modern power supplies. Finally it is addresses the role of the standards on the protection of electronic equipment and the implications for the final costumer. Then it continues with installation of filters on the load side continued with constant maintaining of earthing system inorder to maintain the flow of neutral current in the feeders. This will help to maintain the system stability, reduce the losses occurring due to the presence of THD and reduce the energy bill followed by reduction of EB bus burden. The audit report basically list the recommended electrical machinery safety measure to reduce the energy and maintenance cost.

Devices for Testing Effectiveness of Electronic Equipment Protection against Electromagnetic Pulse (EMP)

Devices for Testing Effectiveness of Electronic Equipment Protection against Electromagnetic Pulse (EMP)

Экспериментальное подтверждение возможности защиты радиоэлектронной аппаратуры от сверхкороткого импульса за счет его разложения в С-секции с лицевой связью

Экспериментальное подтверждение возможности защиты радиоэлектронной аппаратуры от сверхкороткого импульса за счет его разложения в С-секции с лицевой связью

Energy efficiency criteria in uninterruptible power supply selection

With the generalized use of microelectronic devices, server computers and other susceptible equipment, the subject related to power quality (PQ) and its relationship to vulnerability of high performance plants are becoming an increasing concern to the industry. This paper addresses how uninterruptible power supply (UPS), particularly when configured in distributed DC mode, can become an energy efficient (EE) solution in high-tech buildings, especially when integrated with complimentary PQ measures. The paper is based on PQ audits conducted at different high-tech industries over the last years. It was found that the main problems for the equipment installed were voltage sags (or dips). Among all categories of electrical disturbances, voltage sags and momentary interruptions are the nemeses of the automated industrial process. The paper analyzes the capabilities of modern electronic power supplies and the convenience of embedded solution. Finally it is addresses the role of the Standards on the protection of electronic equipment and the implications for the final costumer.

Design and Dynamic Practice of a Novel Fluid Vibration Isolator for Packaging Protection of Electronic Equipment

Abstract The aim of this paper is to study a novel fluid-coupling vibration isolator to improve the dynamics in a harsh vibration-impact environment for packaging reinforcement systems of electronic equipment. The fluid-coupling isolator is designed through coupling the air, oil, rubber, and spring. The dynamic characteristics of the actual fluid-coupling isolator are developed. The test results of the prototype in dynamic tests show complex nonlinear dynamic characteristics. Based on this, a nonlinear dynamic model for the fluid-coupling isolator is presented. Comparisons with experimental data confirm the validity of the model. It builds a basis for future work in engineering design and evaluation of packaging protection system for electronic equipment.

Design, test and modelling evaluation approach of a novel Si-oil shock absorber for protection of electronic equipment in moving vehicles

Electronic equipment systems are precision system. There are some vibrations and impact in moving vehicles for road environments. Therefore, shock absorber is significant in protection of electronic equipment in moving vehicles. The objective of this paper is to provide a systematic investigation to design or evaluation of a shock absorber for protection of electronic equipment system in harsh vibration-impact environment. A novel Si-oil coupling damping shock absorber is designed and manufactured through coupling Si-oil, rubber ball and spring by ingenious tactics. The physical mechanism of a prototype shock absorber is systematically investigated by dynamic test. A nonlinear dynamic model for the shock absorber is presented by analyzing the internal fluid dynamic phenomenon with respect to the prototype. Comparisons between experimental data and simulation result confirm the validity of the model. In the meantime, evaluation of the importance of some key factors by using the mathematical model for designing is discussed. It shows amplitude and frequency of excitation, as well as fluid viscosity, ratio of damping area are the key factors to ensure the performances of the shock absorber. The change of these factors will change the working characteristics and performances of the shock absorber.

Computer-aided design integration of a reinforced vibration isolator for electronic equipment’s system basedon experimental investigation

Electronic equipment’s system is always manufactured as a superprecision system. However, it will be used in harsh environment. For example, the computer in moving vehicles will be acted by vibrations. The objective of this paper is to provide a systematic investigation to test and computer-aided design of the vibration isolator for protection of electronic equipment’s system in harsh vibration environment. A micro-oil damping vibration isolator is designed and manufactured through coupling the oil and spring by ingenious tactics. The structure of the oil damping vibration isolator can achieve circulating oil damping function with an inner tube and an outer tube (some orifices are manufactured on upside and underside of the inner tube). The dynamics of the key model machine is systematically investigated. Based on the test, a nonlinear dynamic model for the vibration isolator is presented by analyzing the internal fluid dynamic phenomenon with respect to the vibration isolator. The model considers all the physical parameters of the structure. Comparisons with experimental data confirm the validity of the model. In the other, the model is integrated by introducing normalization measure. The normalization model shows the actual physical characteristics of the oil damping vibration isolator by considering quadratic damping, viscous damping, Coulomb damping, and nonlinear spring forces. An approximate solution is deduced by introducing harmonic transform method and Fourier transform method. Therefore, a parameter-matching optimal model for computer-aided design of the vibration isolator is build based on approximate solution. An example confirms the validity of the computer-aided design integration.

Power quality in high-tech campus: A case study

This paper presents preliminary results from a power-quality audit conducted at a high-tech campus over the last year. Voltage and current were measured at various R&D buildings; it was found that the main problems for the equipment installed were voltage sags and surges. The paper examines the causes and effects of power disturbances that affect computer or any other microprocessor-based equipment and analyses the auto-protection capabilities of modern power supplies. The convenience of ‘enhanced power supply’ or ‘low-cost customer-side’ protection solutions is also discussed. Finally, it addresses the role of the standards on the protection of electronic equipment and the implications for the final customer.

Power Quality in Clinical Facilities

This paper presents preliminary results from a power quality audit conducted at a clinical building over the last year. Voltage and current were measured at various laboratories; it was found that the main problems for the equipment installed were voltage sags and surges. The paper examines the causes and effects of power disturbances that affect computer or any other microprocessor-based equipment and analyzes the auto-protection capabilities of modern power supplies. The convenience of "enhanced power supply" or "low-cost customer-side" protection solutions is also discussed. Finally it is addresses the role of the Standards on the protection of electronic equipment and the implications for the final costumer.

Comparative Testing and Evaluation of Conformal Coating Materials and Process

Conformal coating materials and processes were comparatively tested and evaluated for protection of electronic equipment. An extensive literature search was conducted for various generic types of conformal coating materials and processes. Testing and evaluation of candidate coating systems were accomplished using printed circuitry coupons, critical components, electronic assemblies, and flexible printed wiring circuitry to determine retention of electrical properties after temperature and humidity conditioning.

Protection of Electronic Equipment from Aircraft Vibrational Environments

A few years ago the Society of Automotive Engineers organized a Committee whose objective was to develop design procedures for vibration, shock, and random excitation isolation of electronic equipment on aircraft. The work of this group is still in progress but a considerable amount of technical information has been developed, and it appears worthwhile to present this information to the Acoustical Society membership in order to take advantage of the resulting interchange of ideas. The S-12 Committee work has been organized into four major categories, and a subcommittee covers each. These subcommittees are: (1) Vibration Sources, (2) Vibration Isolation Systems, (3) Receivers—(The Protected Electronic Equipment), and (4) Complex Wave Excitation. A summary of the work accomplished in each of the above categories will be presented. It is, of course, understood that the author of this paper is merely a spokesman for the SAE group and as such is presenting the results of the efforts of the group.