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Lightning protection system, technical problems in the analysis of weak

Skin effect. Cable through the metal tube full of difficulty, in the cable into the terminal and the front-end equipment to wear before the introduction of metal pipe buried, but buried length of not less than l5m, the home side the cable metal sheath, pipe connected with the mine grounding device . In the wild,[link widoczny dla zalogowanych], buried cables in order to prevent being struck by lightning, after the tree where, according to local thunderstorm days a year, should increase the drain line or underground cable laying flat top. 2.2PSTN Line Lightning introduced by the line outside the building is most vulnerable to the introduction of the indoor Jihuai over-voltage communications equipment, so these devices are connected into the line at, the signal lines required to install the adapter waves surge protector. Surge protector grounding terminal should be connected to ground patch panel, patch panels, grounding wire should be used cross-sectional area of not less than l6ram multi-strand copper cable, patch panel connected to the engine room from the local equipotential ground terminal board. Patch panels and equipment should be prepared to metal bonding and grounding. Lightning 2.3 into the computer network system, a set of buildings on the transmission line surge protector. Computer equipment input / output ports, it shall be installed in the computer adaptive signal surge protector. Signal the engine room of the ground surge protectors, should adopt the cross-sectional area of not less than ¨ 5mm multi-strand insulated copper wire, single point connection to the engine room local equipotential ground terminal board; computer room security, the signal is working to , shield grounding, anti-static grounding and surge protection devices should be connected to the earth and other local equipotential ground terminal board. 2.4 monitoring system the various lines of lightning protection systems in buildings or cloud-to-cloud-to-non-protection zone and the first protection zone of the protection zone should be installed at the junction line is fitted with surge protectors. System,[link widoczny dla zalogowanych], the central control room should be set bonding network. All equipment metal chassis interior (shell), metal trough, protection of ground and surge protectors should be done such as grounding, bonding and grounding. The grounding system should adopt common ground, the ground lines should be not less than 16ram section of copper insulated wire, and pipe laying should wear to the nearest equipotential ground terminal board. 2.5 mine elevator machine room elevator system into the line-side power surge protection must be installed, while the elevator equipment should be well grounded metal housing, a single ground wire to the cross-sectional area not less than 2I5ram, elevator machine room all equipment and buildings within the steel and other potential top-level connections, the elevator guide rail, car and electrical equipment should be done pit bonding and grounding. 2.6 The automatic fire alarm and fire control system of the mine fire alarm control system alarm host,[link widoczny dla zalogowanych], linkage control panel, fire radio, intercom communications, signal transmission cable system in and out of the building should be non-protection zone, or cloud-to- cloud-to-protection zone and protection zone at the junction of the first installation of adaptive signal surge protector. Fire control room with the region or city Fire control room should be set bonding network, all rack room (shell), wiring ducts, equipment, protective grounding, security,[link widoczny dla zalogowanych], protective grounding, surge protection should be close to ground potential such as ground terminal connected to the board. Automatic fire alarm and control system should adopt the common ground the ground. The grounding line should be used cross-sectional area of not less than 16ram of insulated copper wire and pipe laying Yichuan connected to the layer (or near) the equipotential ground terminal board. 3 Analysis of the weak system of mine buildings can take two measures: First, the appropriate place in the weak system installed adaptation of SPD, and make other potential connections. Second, in the weak system into the line to take through the introduction of buried pipe, buried longer than 15m, buried deeper than 015m, and make other potential connections. But we often find in the mine, a lot of architectural drawings for a weak system that is not designed to meet the requirements, often just say that TV system, telephone system,[link widoczny dla zalogowanych], buried into the question of whether to wear steel and depth, are not laid length Description; still others are installing SPD, but the specific installation location and the SPD model and so did not say. This requires work in the usual familiar lightning, lightning grasp of the relevant technical requirements, comprehensive care of the drawings, specific analysis for specific issues, so as to make mine work. 4 Conclusion weak system in the mine through the analysis of technical issues, concluded: If you are still using the old concepts and technologies for mine mine will lead to disaster and loss. Therefore, the lightning protection technology requires a big change, big improvement from a systemic point of view must be comprehensive defense to consider aspects of technology. 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