Explosion proof requirements and detecting methods for radio wave transmission power
The current national standard GB/T 3836.1-2021 Explosive atmospheres-Part 1:Equipment-General requirements and the international standard IEC 60079-0:2017 Explosive atmospheres-Part 0:Equipment-General requirements stipulate that the threshold power of a radio transmitter is the product of the effective output power of the radio transmitter and the antenna gain.Under the condition of a certain threshold for the safe transmission power of radio wave explosion-proof,the larger the antenna gain,the smaller the effective output power of the radio transmitter.This will limit the improvement of wireless transmission distance by increasing the antenna gain.Therefore,it is necessary to study the correctness of the threshold power specified in the national standard GB/T 3836.1-2021 and the international standard IEC 60079-0:2017,and propose reasonable explosion-proof requirements and detection methods for radio wave transmission power.It has been proposed that the safe transmission power of radio waves is independent of antenna gain,and the threshold power of radio transmitters specified in the national standard GB/T 3836.1-2021 and the international standard IEC 60079-0:2017 is incorrect.It is proposed that the threshold for the safe transmission power of underground wireless radio waves in coal mines should be greater than 16 W and independent of antenna gain.The national standard GB/T 3836.1-2021 and the international standard IEC 60079-0:2017 stipulate that the threshold power shall not exceed 6 W,which is incorrect.A method for detecting the explosion-proof safety performance of wireless radio waves has been proposed.The method detects the output power of wireless transmitters.This not only ensures the explosion-proof safety of the detected wireless equipment,but also simplifies the detection method.The method improves the wireless radio wave transmission power of the wireless equipment,removes the limitation on antenna gain,and greatly improves the wireless transmission distance of wireless explosion-proof equipment in coal mines.
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