定价： 260元 / 折扣价： 221 元 加购物车

定价： 345元 / 折扣价： 294 元 加购物车

定价： 592元 / 折扣价： 504 元

1. Scope and Objectives 1.1 Scope This Standard applies to suspension and dead-end composite insulators used on ac overhead transmission lines with a nominal voltage 69 kV or greater and a frequency not greater than 100 Hz. 1.2 Objectives The

定价： 592元 / 折扣价： 504 元

1.1 Scope This standard applies to hollow insulators made of ceramic material, with their fixing devices, intended for use with a perman ent gas pressure greater than 0,5 bar having an internal volume equal to or greater than 1 litre (1 000 cm3). They

定价： 819元 / 折扣价： 697 元

1 Scope This International Standard is applicable to string insulator units of ceramic material or glass for use on d.c. overhead power l ines with a nominal voltage greater than 1 000 V. It is not applicable to composite insulators. The applicat

定价： 910元 / 折扣价： 774 元

1. Scope 1.1 This Standard specifies the mechanical, dimensional and electrical requirements for ceramic and glass type station post insulators for indoor or outdoor service in electrical installations or equipment operating with a rated voltage great

定价： 455元 / 折扣价： 387 元

1. Scope 1.1 This Standard specifies the test methods to be used for determining the characteristics of station post insulators. 1.2 Individual tests shall be made only when specified. 1.3 This Standard covers tests applicable to station post i

定价： 455元 / 折扣价： 387 元

This specification covers the requirements for magnesium oxide (MgO) and aluminum oxide (Al2O3) powders and crushable insulators used to manufacture metal-sheathed platinum resistance thermometers (PRTs), noble metal thermocouples, base metal thermocouples, and their respective cables. The following test shall be performed to meet the requirements specified: breaking force test; wet chemical analysis; fusion calorimetric analysis; quantitative analysis; and density determination.1.1 This specification covers the requirements for magnesium oxide (MgO) and aluminum oxide (Al2O3) powders and crushable insulators used to manufacture base metal thermocouples, metal-sheathed platinum resistance thermometers (PRTs), noble metal thermocouples, and their respective cables.1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

定价： 1365元 / 折扣价： 1161 元