IEC 60079-31:2022 爆炸性环境.第31部分:外壳“t”的设备粉尘点火保护

标准编号：IEC 60079-31:2022

中文名称：爆炸性环境.第31部分:外壳“t”的设备粉尘点火保护

英文名称：Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"

发布日期：2022-01-17

标准范围

IEC 60079-31:2022作为IEC 60079-31:2022 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60079-31:2022适用于受保护的设备在爆炸性粉尘环境中使用的外壳和表面温度限制。它规定了防爆设备和防爆部件的设计、建造和测试要求。本文件补充和修改了IEC 60079-0的一般要求。如果本文件的要求与IEC 60079-0的要求相冲突，则以本文件的要求为准。本文件不适用于不需要大气氧气燃烧的爆炸物粉尘或自燃物质。本文件不适用于拟用于矿场地下部分的防爆设备或防爆部件，也不适用于这类矿场的地面装置中受烟气和/或燃烧物危害的部分灰尘。本文件未考虑粉尘中易燃或有毒气体排放的任何风险。这第三版取消并取代了2013年出版的第二版。本版构成技术修订版。与上一版相比的主要重大变化是:1）文档已从第2版重组2）第4.3.1和4.4.1条中中断触点的故障电流额定值，主要变化类型C13）第4.3.5.1和4.4.5.1条中的电池和电池组，主要变更类型C24）用于确定“tb”变流器供电旋转电机温度等级的过载或故障条件，主要变化类型C35）带外壳“t”粉尘点火保护的进入装置的附加要求，主要变更类型C4有关“重大技术变更”背景的信息保护等级为“ta”的C1-EX设备应额定连接到预期短路电流不大于1.5 kA的电路。对于保护等级为“tb”或“tc”的防爆设备，用于电源连接并用于中断10kA以上的故障电流，设备应具有额定最大短路耐受电流，根据6.1.1.1进行测试，并根据第7条进行标记。C2-对于包含电池或电池组的防护等级为“ta”的防爆设备，应仅使用密封电池或电池组。对于保护等级为“tb”和“tc”的防爆设备，其中存在火花触点或热表面，并且包含电池或电池组，只能使用密封电池或电池组。C3-表2现在包括用于确定保护级别“tb”转换器的温度等级的故障条件-馈电电机。C4-为保护类型为“t”的进入设备增加了附录A，包括电缆传输设备。

IEC 60079-31:2022 is available as IEC 60079-31:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60079-31:2022 is applicable to equipment protected by enclosure and surface temperature limitation for use in explosive dust atmospheres. It specifies requirements for design, construction and testing of Ex Equipment and Ex Components. This document supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this document conflicts with a requirement of IEC 60079-0, the requirement of this document takes precedence. This document does not apply to dusts of explosives, which do not require atmospheric oxygen for combustion, or to pyrophoric substances. This document does not apply to Ex Equipment or Ex Components intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by firedamp and/or combustible dust. This document does not take account of any risk due to an emission of flammable or toxic gas from the dust. This third edition cancels and replaces the second edition published in 2013. This edition constitutes a technical revision. Main significant changes from the previous edition are:
1) Document has been restructured from edition 2
2) Fault current rating of interrupting contacts in clauses 4.3.1 and 4.4.1, major change type C1
3) Cells and batteries in clauses 4.3.5.1 and 4.4.5.1, major change type C2
4) Overload or malfunction condition for the determination of temperature class for "tb" converter fed rotating electric machines, major change type C3
5) Additional requirements for entry devices with dust ignition protection by enclosure "t", major change type C4
Information about the background of ‘Major Technical Changes’
C1 – Ex Equipment having Level of Protection "ta" shall be rated for connection to a circuit with a prospective short circuit current of not greater than 1.5 kA. For Ex Equipment having Level of Protection "tb" or "tc" which is intended for mains connection and intended to interrupt fault current above 10kA, the equipment shall have a rated maximum short circuit withstand current, be tested according to 6.1.1.1, and be marked according to Clause 7.
C2 – For Ex Equipment having Level of Protection "ta" which contains a cell or battery, only a sealed cell or battery shall be used. For Ex Equipment having Level of Protection "tb" and "tc" where there are sparking contacts or hot surfaces, and which contains a cell or battery, only a sealed cell or battery shall be used.
C3 – Table 2 now includes malfunction conditions for temperature class determination of Level of Protection "tb" converter-fed electric machines.
C4 – Annex A added for entry devices with Type of Protection "t" including cable transit devices.

标准预览图