Monthly Archives: July 2013

Insulation Related

Chinese Institute of Electronics (CIE)

CIE is voluntarily constituted by the electronic information technology workers and related enterprises, legally registered academic, non-profit national legal associations, national Society, is the component of China Association for Science and Technology, anchored and accepted the direct leadership of the Ministry of Information Industry. Since its inception in 1962, CIE has always been an important force to promote the development of China’s electronic information of science and technology. As a unique platform for the integration and promotion of resources, it has extensive far-reaching impact of electronic information science and technology.

Council of the Institute has a total of 199 directors, including 52 executive directors, in which 10 vice president. Institute consists of 43 professional chapters, nine working committees and an office with one hundred people, and has local Society organizations in the country’s 30 provinces, autonomous regions and municipalities. Work covering various categories of the semiconductor, computer, communications, radar, navigation, microwave, radio, television, electronic measurement, signal processing, electromagnetic compatibility, electronic components, electronic materials and all regions.

Institute has more than 100 thousand professional members, including more than 10 thousand senior members. Institute host more than 20 kinds of journals of electronic information, held annually more than 200 large-scale conferences, exhibitions, publishing dozens of industry research reports, publishing a variety of books and series.

The institute is the member of the International Federation for Information Processing Society (IFIP), the International Union of Radio Science (URSI), the International Committee of Contamination Control Societies (ICCCS), International Pharmaceutical Federation for Information Processing (IMIA), and established membership relations with the American Institute of Electrical and Electronics Engineers (IEEE) , Institute of Electrical Engineers (IEE), Japan Society of Applied Physics (ISAP), Korea Electronics and Electrical Institute (KlTE), co-sponsorship of a series of more than ten international conferences, and build a unique platform for introduction, export, international exchanges of electronic information science and technology and product.

Insulation Knowledge

Basic selection principles of Electrical insulation materials

1. The premise of selecting an electrical insulation material

You should be clear before selection an insulating material: ① the structure of electrical equipment which use this material, the location and fixation of materials in the device.② working status of this equipment and the effect of the material in this state. ③how the insulating material is processed in this electrical equipment.④ how many insulating material in the device and which kind of insulation systems are they composed

2 Basic selection principles

(1) the force field the materials in. In addition to ensuring the safe operation of electrical insulating materials, insulating material may also be affected by centrifugal force, extrusion, compression, tension, stretch, shear, bending, or other force of repeated bending, some of these forces are stationary on the structure of the present device, others are generated when devices rotated, heated and other working conditions.

(2) the temperature field the materials in. Most electrical devices generate heat during operation the temperature rises, and some electrical equipment is to work for the purpose of heating, these will make the insulating material inside a specific temperature field. Selection of materials should calculate the temperature distribution of the device while operating, clear at what temperature insulating materials (including start-up, long-term and abnormal heat shock), combined with the life of the equipment, refer to Table 1 – 2, then consider the special case, select the appropriate heat-resistant grade of the material. It should also be noted here that the life of the device itself, such as general electrical equipment’s life is 15 years of continuous operation, but some devices may only work a few weeks or even a few hours, some work intermittently. All factors should be taken into account.

(3) the electromagnetic field material in. Electric and magnetic fields of different electrical equipment vary considerably, consequences resulting in electrical aging is also very different, such as voltage, current, AC, DC, low frequency, high frequency, frequency, electromagnetic waves of different shape, sine wave, square wave, steep waves, steep wave pulse, even within the insulating material has the electric field distribution. In addition, under high or special high voltage corona field, leakage, and the resulting partial discharge ozone and ionized particles impact, cracking, etc. Furthermore, in different power states, such as large current or no electric current, the electromagnetic field (electrostatic), etc. These all made for a very different requirements on insulating materials, must be selected.

(4) Material compatibility with the surrounding material. In the electrical equipment and components, the insulation material must work together with other materials, such as conductors, other insulators (gas, liquid, solid) as well as other mechanical materials and chemical materials. In most cases, an insulating structure may also be composed of several insulation materials. These materials, at room temperature or lower temperature, due to the role of the electric and thermal field, each occur physical, chemical reactions, such as dissolution, swelling, surface chemical reactions, mutual penetration, ion exchange, or by the reaction of new substances. These reactions by materials working together and what kind of positive or negative consequences the selected materials working in electrical equipment will bring, must also be evaluated in the selection.

(5) The process of the material. Materials used in electrical equipment, may be processed in two ways: first, make hold of the products, second, to be processed in the manufacture of construction equipment. This should be known when design (or repair). The materials must be able to not only withstand these processes, but its performance also to adapt the technologic requirement during processing and processed by electrical equipment finally. These processes include forming, cutting, punching, cutting, winding, impregnation, compound, pressing, baking, drying, off the assembly line, the line corrosion, bonding, coating, coating, wrapping, casting, extrusion, injection molding, molding, coating, welding, fitting, impact, etc., but also an important intermediate parts should be tested prior to assembly, or even simulated working conditions or under more severe conditions for type test or evaluation test. Material must be able to adapt to these processes.

(6) special environment material in. In recent years, electrical environments work in more extreme are increasing, such as the deep cold, ultra-high temperature, humidity, vacuum, high pressure, high altitude, deep sea diving, submersible, submersible water, space, underground, super frequency, intense pulsed , strong nuclear radiation, cosmic radiation, bad weather and unprotected work, etc., special attention is needed in the election insulating material.

(7) economy, easy access and friendly environmental. Economy, easy access to any material that is environmentally friendly is universal principles of selecting any material. Economy should include the price of the material itself and the additional value during process of obtaining (such as communications, transportation, storage and other additional costs), so a small amount of material downgrade is to be frequent occurrence. Besides, modern environment-friendly is the factor of selection, such as materials solvent-free, flame retardant, conducive to environmental protection, in line with environmental laws, regulations, decrees and standard.

Insulation Related

International Electrotechnical Commission (IEC)

IEC, founded in 1906, is the first international electrotechnical standardization institution of the world, headquartered in Geneva. After the establishment of ISO in 1947, IEC is merged into ISO as electrical department, but maintains independence technically, financially. According to the new agreement between ISO and IEC in 1976, the two organizations are legally independent organizations, IEC is responsible for the electrical and electronic fields of international standardization and work in other areas is responsible by ISO.

The purpose of IEC is to promote international cooperation on the standardization of electrical and electronic fields and enhance mutual understanding. To achieve this goal, publishing a variety of publications, including international standards, and hoped that the National Committees use these international standards when their national conditions permit. Working areas of IEC includes electrical technologies of electrical, electronic, telecommunications and nuclear energy.

The highest authority of the IEC is Council. There are currently 53 member states, known as IEC National committees, each country can only have one institution as its members. Each Member State are members of the Council, the Council meeting once a year, called the IEC annual meeting, held alternately in each member states. Executive Committee deals with the matters assigned by the Council.

IEC technical work is charged by the Executive Committee (CA), in order to improve work efficiency, CA divided into A, B, C three groups, processing simultaneously in different areas of standards development and coordinating problems. There are currently 104 IEC technical committees and 143 sub-technical committees. China became the IEC Executive Committee members in 1957, in 1990 and 2002 hosted the 54th IEC and 66th Annual Meeting.

IEC has 3 Certification committees, namely the International Electrotechnical Commission Quality Assessment System for Electronic Components (IECQ), Worldwide System for Conformity Testing and Certification of Electrotechnical Equipment and Components (IECEE), IEC Scheme for Certification to Standards for Electrical Equipment for Explosive Atmospheres (IECEX). In order to develop an unified criteria for certification, IEC also established in 1996 Conformity Assessment Board (CAB), responsible for the development, including system certification and a series of certification and accreditation guidelines.

Voice Coil Material

Voice Coil Material Introduction Video from China

This is the Voice Coil (Bobbin) Material Introduction video from Dexlu Industry Co.,Ltd of China including KRLock, KSV, NSV, TSV etc, we offer the online shopping for the various of voice coil material, you can visit “www.dexlu.biz” for more detail.

Insulation Related

International Organization for Standardization (ISO)

ISO, established in February 23, 1947, is the largest international standardization organizations in the world. Its predecessor was the International Standards Association (ISA), founded in 1928. October 14, 1946, representatives from 25 countries met in London, decided to establish a new international organization to promote international cooperation and unification of industrial standards.。 Accordingly, October 14 was designated as World Standards Day. World Standards Day first celebrated on October 14, 1970, by President of ISO Mr. Faruk Sunter (Turkey) of the time.

ISO is responsible for all other areas of standardization activities except electrical and electronic fields. Its purpose is “to promote the worldwide development of standardization and related activities in order to facilitate the international exchange of goods and services in the fields of intellectual, scientific, technological and economic cooperation. ISO’s highest authority is the annual “General Assembly”, the daily offices is the Central Secretariat, based in Geneva, Switzerland. China applied in 1978 to re-join the International Organization for Standardization.

ISO carry out technical activities through its 2856 technical institutions, of which, 185 Technical Committee (TC), 611 Sub-Technical Committee (SC) total, 2022 Working Group (WG), 38 special working groups. International standards is formed by the TC and SC through six stages: ① the application stage; ② preparatory phase; ③ committee stage; ④ review stage; ⑤ approval stage; ⑥ release phase. If the documents acquire at the beginning more mature, some stages can be omitted.

The technical activities fruits of 2856 ISO technical institutions is “international standards.” ISO has developed more than 10,300 international standards, mainly related to the technical specifications of various products industries. ISO international standard number format is: ISO + standard number + colon + release year, for example: IS08402: 1987, IS09000-1: 1994, etc., are a certain number of criteria.