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A complete English edition of this article has not been published. The complete available Chinese version is shown below.

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Measuring principles4 min readContent language: ChineseUpdated 23 October 2026

隔离式安全栅:Lo与Li、电缆电感怎样形成预算?

在适用方法允许独立电感核对时,器件与电缆的电感总量应落在相应允许Lo内。

直接回答与技术机理

在适用方法允许独立电感核对时,器件与电缆的电感总量应落在相应允许Lo内。长度变长会增加电缆贡献,仪表本身Li很小不代表线路贡献可忽略。

电感预算不能遗漏往返导线及集中元件。线缆资料的每米参数必须对应所采用结构和定义,不能把单根导线数据当整条回路。Lo比较通过之后,仍需要核对电容、电阻比或组合条件。

成立条件和独立约束

电感和电容共同存在、多个电源或特殊输出可能要求额外方法,不能只依据一个求和式批准整回路。

核查重点是:统一电感单位并核对组合限制。本安关联设备将非本安侧与危险侧回路分隔并限制规定条件下可输出的能量。

针对本题的核对方法

  • 统一亨毫亨微亨单位,列全线路与附件,并核对对应气组的Lo。
  • 适用的电感预算需包含Li及线路贡献。
  • 统一电感单位并核对组合限制。
  • 对“假设Lo一毫亨、Li零点二毫亨,电缆贡献零点四毫亨,仍需继续核查电容与组合表”记录实际端子、参数来源与观察条件;结合“电感和电容共同存在、多个电源或特殊输出可能要求额外方法,不能只依据一个求和式批准整回路”核对本题尚未验证的约束。

假设案例与判定

假设出现以下情况:假设Lo一毫亨、Li零点二毫亨,电缆贡献零点四毫亨,仍需继续核查电容与组合表。

这一案例需采用前述参数定义和适用条件作判断,不能把正常功能、单项比较及整条回路的最终结论混为一项。若实际型号文件的条件与案例不同,应回到实际文件重新评价。此情景用于解释技术判据。

系统边界及所需证据

参数比较是特定方法下的技术判断,不是对现场作业的授权;本文不提供带电危险区接线或绕过保护的步骤。

复核所需技术对象包括:提供回路图、完整证书及控制图、现场设备参数、电缆附件清单和项目区域条件。参数必须来自实际订货型号及对应端子组,示例资料不构成道威斯顿产品能力承诺。图纸与证书所列条件不一致时,应先解决不一致,而不能按较有利的一份资料放行。

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