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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:简单设备为什么也不是完全不用评价?

某些无源简单器件可按适用规则纳入本安设计,但其储能、发热、接线及组合条件仍需评价。

直接回答与技术机理

某些无源简单器件可按适用规则纳入本安设计,但其储能、发热、接线及组合条件仍需评价。无电源或机械开关名称并不等于所有条件自动为零。

简单器件的名称不等于所有内部参数为零。无源开关仍有导线和可能发热路径,带指示灯或电子附件后结构也可能变化。判断应基于实际组件清单和适用规则,不能只看采购名称写着干接点。

成立条件和独立约束

是否属于简单设备及如何处理应依适用规则与结构,带电子电路或储能的附件不能凭外观归类。

核查重点是:未知参数不能直接当作零。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

  • 列出器件结构、可能储能与温升条件,纳入系统说明及计算。
  • 简单设备仍需储能发热和组合评价。
  • 未知参数不能直接当作零。
  • 对“干接点被称为简单器件,仍要考虑现场连接、线路与允许环境,而非在图纸中完全省略”记录实际端子、参数来源与观察条件;结合“是否属于简单设备及如何处理应依适用规则与结构,带电子电路或储能的附件不能凭外观归类”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:干接点被称为简单器件,仍要考虑现场连接、线路与允许环境,而非在图纸中完全省略。

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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