易爆环境.第7部分：增加安全性的"e"型防护电气设备

[中文适用范围]： “IEC 60079 的这一部分规定了用于爆炸性气体环境中具有增强安全保护类型“e”的电气设备和防爆组件的设计@构造@测试和标记的要求。类型的电气设备和防爆组件增强安全防护等级“e”是： a) 防护等级“eb”（EPL“Mb”或“Gb”）；或 b) 防护等级“ec”（EPL “Gc”）防护等级“eb”适用于设备或防爆组件@包括它们的连接@导体@绕组@灯@和电池；但不包括半导体或电解电容器。 注1：电子元件的使用@例如半导体或电解电容器@被排除在保护等级“eb”之外，因为如果不应用内部间隔距离，预期的故障可能会导致温度过高或电弧和火花。维持这些间隔距离和火花通常是不切实际的。维持电子元件的功能。保护等级“ec”适用于设备或防爆组件@包括它们的连接@导体@绕组@灯@和电池；还包括半导体和电解电容器。注 2：在保护等级“ec”中允许使用电子元件@，例如半导体或电解电容器@，因为这些电子元件是在正常条件和常规预期发生情况下进行评估的@，并且不太可能导致过高的温度或电弧和火花。由于间隔距离的要求不适用于内部结构，如果外部间隔距离符合，市售电子元件通常是合适的。除非另有说明，本标准的要求适用于两个保护级别。对于防护等级“eb”@，本标准适用于额定电压不超过 11 kV rms@交流或直流的电气设备 对于防护等级“ec”@，本标准适用于额定电压不超过 11 kV rms@ 的电气设备不超过 15 kV rms@ 交流或直流 注 3：流过主电路增强安全连接的短路电流不被认为会因产生的机械应力导致连接移动而产生爆炸性气体环境着火的重大风险通过短路电流。正常的工业标准要求考虑短时高电流对连接安全性的影响。爆炸性气体环境的存在不会对连接的安全性产生不利影响。注 4：由于电流超出正常额定电流@而发生的任何短期热偏移，例如在电机启动过程中发生的情况@，不被认为会产生爆炸性气体环境着火的重大风险。事件的持续时间相对较短以及事件期间发生的对流。注 5：高压连接和相关接线（高于 1 kV）可能容易受到局部放电活动增加的影响，而局部放电活动可能成为点火源。通常会增加与接地表面或其他连接的间距，并为端子提供适当的高压应力消除。本标准补充和修改了IEC 60079-0的一般要求。如果本标准的要求与 IEC 60079-0@ 的要求发生冲突，则以本标准的要求为准。” [外文原描述]： IEC 60079-7:2015 specifies the requirements for the design, construction, testing and marking of electrical equipment and Ex Components with type of protection increased safety "e" intended for use in explosive gas atmospheres. Electrical equipment and Ex Components of type of protection increased safety "e" are either: - Level of Protection "eb" (EPL "Mb" or "Gb"); or - Level of Protection "ec" (EPL "Gc"). Level of Protection "eb" applies to equipment or Ex Components, including their connections, conductors, windings, lamps, and batteries; but not including semiconductors or electrolytic capacitors. Level of Protection "ec" applies to equipment or Ex Components, including their connections, conductors, windings, lamps, and batteries; and also including semiconductors and electrolytic capacitors. The requirements of this standard apply to both Levels of Protection unless otherwise stated. For Level of Protection "eb", this standard applies to electrical equipment where the rated voltage does not exceed 11 kV r.m.s., a.c. or d.c. For Level of Protection "ec", this standard applies to electrical equipment where the rated voltage does not exceed 15 kV r.m.s., a.c. or d.c. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. This fifth edition cancels and replaces the fourth edition published in 2006, and constitutes a technical revision. Refer to the Foreword of the document for a complete listing of the technical changes between edition 5.0 and previous edition of the document. Keywords: electrical equipment and Ex Components with type of protection increased safety "e" intended for use in explosive gas atmospheres. The contents of the Interpretation sheet 1 of September 2016 have been included in this copy.