电信接入网设备的安全和过压防护测试（Safety and overvoltage protection test for telecommunication access network equipment）.docVIP

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电信接入网设备的安全和过压防护测试（Safety and overvoltage protection test for telecommunication access network equipment）.doc

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电信接入网设备的安全和过压防护测试（Safety and overvoltage protection test for telecommunication access network equipment） Safety and overvoltage protection test for telecommunication access network equipment Telecommunication access network Ethernet The filtered ads, safety protection The detection of safety performance is mainly based on standard YD / T 965-1998. At present, there are two main power supply modes in Telecom Access Network: 220V AC and -48V dc. The following will be discussed separately. 1.220 V AC powered telecommunications access network equipment Telecom access network equipment is generally I class equipment, there are protective grounding, mainly divided into the following six major testing items. (1) General requirements First of all, the equipment nameplate requirements: tags should be durable and eye-catching, and the nameplate should include the equipment rated voltage, rated frequency, rated current, product model name, manufacturers, trademarks and other information. Second, the power line components required for equipment comply with national standards such as GB 1002 and GB 2099. Thirdly, check the mechanical structure of the equipment. Requirements of equipment should be able to withstand a certain mechanical strength, there is sufficient stability, the equipment shell without burr, no sharp edges and corners, etc.. (2) power interface test; The equipment is required to operate normally on the power supply between the lower limit -10% and the upper limit +10% of the rated voltage range, and its steady input current shall not exceed 10% of the rated current. (3) grounding resistance test; The measurement of grounding resistance is in a certain period of time, the power supply voltage between the protective earth terminal and other equipment grounding parts through the current generated after the fall, according to the voltage drop protection calculated connection conductor resistance value should be consistent with the requirements. General detection, th