标准名称：	互感器 第8部分：电子式电流互感器
英文名称：	Instrument transformers—Part 8:Electronic current transformers
中标分类：	电工 >> 输变电设备 >> 变压器
ICS分类：	电气工程 >> 变压器、电抗器
发布部门：	中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会
发布日期：	2007-01-16
实施日期：	2007-08-01
首发日期：	2007-01-16
作废日期：
主管部门：	中国电器工业协会
提出单位：	中国电器工业协会
归口单位：	全国互感器标准化技术委员会(SAC/TC 222)
起草单位：	沈阳变压器研究所、传奇电气（沈阳）有限公司、南京新电宁电力技术有限公司
起草人：	高组锦、魏朝晖、尹秋帆
出版社：	中国标准出版社
出版日期：	2007-08-01
页数：	【胶订-大印张】平装16开 页数：98, 字数：188千字
计划单号：	20031316-T-604

GB/T 20840的本部分适用于新制造的模拟量输出的电子式电流互感器，它具有模拟量电压输出或数字量输出，供频率为15Hz至100Hz的电气测量仪器和继电保护装置使用。

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Product Code:SAE J1850
Title:Class B Data Communications Network Interface
Issuing Committee:Vehicle Architecture For Data Communications Standards
Scope: This SAE Standard establishes the requirements for a Class B Data Communication Network Interface applicable to all On- and Off-Road Land-Based Vehicles. It defines a minimum set of data communication requirements such that the resulting network is cost effective for simple applications and flexible enough to use in complex applications. Taken in total, the requirements contained in this document specify a data communications network that satisfies the needs of automotive manufacturers.This specification describes two specific implementations of the network, based on media/Physical Layer differences. One Physical Layer is optimized for a data rate of 10.4 Kbps while the other Physical Layer is optimized for a data rate of 41.6 Kbps (see Appendix A for a checklist of application-specific features). The Physical Layer parameters are specified as they would be detected on the network media, not within any particular module or integrated circuit implementation.Although devices may be constructed that can be configured to operate in either of the two primary implementations defined herein, it is expected that most manufacturers will focus specifically on either the 10.4 Kbps implementation or the 41.6 Kbps implementation depending on their specific application and corporate philosophy toward network usage. However, low-volume users of network-interface devices are expected to find it more effective to use a generic interface capable of handling either of the primary implementations specified in this document.
Rationale: This SAE Standard establishes the requirements for a Class B Data Communication Network Interface applicable to all On- and Off-Road Land-Based Vehicles. It defines a minimum set of data communication requirements such that the resulting network is cost effective for simple applications and flexible enough to use in complex applications. Taken in total, the requirements contained in this document specify a data communications network that satisfies the needs of automotive manufacturers.This specification describes two specific implementations of the network, based on media/Physical Layer differences. One Physical Layer is optimized for a data rate of 10.4 Kbps while the other Physical Layer is optimized for a data rate of 41.6 Kbps (see Appendix A for a checklist of application-specific features). The Physical Layer parameters are specified as they would be detected on the network media, not within any particular module or integrated circuit implementation.Although devices may be constructed that can be configured to operate in either of the two primary implementations defined herein, it is expected that most manufacturers will focus specifically on either the 10.4 Kbps implementation or the 41.6 Kbps implementation depending on their specific application and corporate philosophy toward network usage. However, low-volume users of network-interface devices are expected to find it more effective to use a generic interface capable of handling either of the primary implementations specified in this document.