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Why cabinet power lightning protection electricity
by：TNE
2020-12-02
Cabinet power to prevent thunder, cabinet has a dedicated power supply, to the requirement of PDU, commonly called a PDU, is required to prevent thunder, summer is the season of lightning more commonly, cabinet is placed high-end equipment, mainly is to provide the protection of equipment, and these electronic instruments and equipment, to solve the most is that lightning to the impact of the electronic system, when lightning occurs, we may not on the surface the cabinet power supply have what problem, but often in the place where we can't see, there are a lot of problems, thunder and lightning, the consequences of light person is without electricity, short circuit, the person that weigh can even cause fire, etc.
High-end instrument is to store data, if there is a fire, so these one can imagine the consequences of loss of data.
This requires, on the cabinet power to do lightning-proof measures.
Reduce the harm of cabinets and equipment instrument internal.
The cabinet power lightning protection measures are what?
generally divided into several, we detailed look at first to determine the minefield in buildings ( LPZ) Rules is the building is divided into four areas: LPZOA area, a direct lightning strike at the objects in this area is likely to be, in no attenuation of electromagnetic field; LPZOB area, in this area of objects can't be direct lightning strike, nor attenuation in electromagnetic field; LPZ1 area, in this area of objects can't be direct lightning strike, the electromagnetic fields in the possible attenuation; LPZ2 area for subsequent minefield.
actually should determine the position of the room: the location of the rack PDU should be combined with the construction of far and near planning, as well as the factors to determine the location of terrain. For high-rise building, common practice is to put the room is more than 4 layer below the first layer of space. But in humid areas, the first layer should not be set telephone switching machine room. Because want to pay attention to moistureproof.
the third locate cabinet power link or allelic links: cabinet power supply, the purpose of the equipotential connection is to reduce need space of lightning protection of all kinds of metal parts and the potential difference between a system. Requirements through the minefield border of metal components and systems, as well as within a minefield prevention of metal components and systems, should be in the minefield border do equipotential connection.
to determine the wiring method 4: at present, the rack PDU of transmission network in the outdoor is the overhead and buried the two methods. On overhead lines should be the phone or cable which in the front of buried, buried length & gt; 2ρ( Rho resistivity of ground resistance) And the actual length & gt; 50m。 And buried is usually adopts metal armoured cable directly buried, prevent corrosion, wear directly buried metal pipe or non-metallic shielded cable. From the lightning protection point of view, in the case of conditional home cable should choose buried way. SPC exchange of transmission network in an indoor should be along the special signal cable wiring, avoid along the building structure column or clingy wall installation; Strong and weak electricity cable, unfavorable with slot to reduce interference.
the fifth is to determine the switch grounding requirements: get the line rack PDU grounding walk line including: dc power grounding; Telecommunications equipment cabinet or rack shielding grounding; The inbound communication cable metal sheath or shielding grounding; Open wire or cable inbound arrester grounding and signal cable line for the empty, etc.
the last thing to do is the shield of switch: switch block ( Including space and line block) In addition to the signal and the power cord, exchange room should also make block processing, specific approach is to put the metal door, window, ceiling keel and anti-static special ground floor. In general, the content of cabinet power supply lightning protection measures are, the lightning protection function can't lay particular stress on either side. So as to ensure safety.
if done improperly, lightning protection caused the loss of data or unable to recover data, we would have lost some important data, sometimes, lightning protection, power is just data, so this time, there are times when it was attacked by hackers, data in this way, the trouble is, in short, cabinets protect precision equipment at the same time, to the requirement of PDU is as far as possible to prevent lightning damage to cabinet equipment.
generally divided into several, we detailed look at first to determine the minefield in buildings ( LPZ) Rules is the building is divided into four areas: LPZOA area, a direct lightning strike at the objects in this area is likely to be, in no attenuation of electromagnetic field; LPZOB area, in this area of objects can't be direct lightning strike, nor attenuation in electromagnetic field; LPZ1 area, in this area of objects can't be direct lightning strike, the electromagnetic fields in the possible attenuation; LPZ2 area for subsequent minefield.
actually should determine the position of the room: the location of the rack PDU should be combined with the construction of far and near planning, as well as the factors to determine the location of terrain. For high-rise building, common practice is to put the room is more than 4 layer below the first layer of space. But in humid areas, the first layer should not be set telephone switching machine room. Because want to pay attention to moistureproof.
the third locate cabinet power link or allelic links: cabinet power supply, the purpose of the equipotential connection is to reduce need space of lightning protection of all kinds of metal parts and the potential difference between a system. Requirements through the minefield border of metal components and systems, as well as within a minefield prevention of metal components and systems, should be in the minefield border do equipotential connection.
to determine the wiring method 4: at present, the rack PDU of transmission network in the outdoor is the overhead and buried the two methods. On overhead lines should be the phone or cable which in the front of buried, buried length & gt; 2ρ( Rho resistivity of ground resistance) And the actual length & gt; 50m。 And buried is usually adopts metal armoured cable directly buried, prevent corrosion, wear directly buried metal pipe or non-metallic shielded cable. From the lightning protection point of view, in the case of conditional home cable should choose buried way. SPC exchange of transmission network in an indoor should be along the special signal cable wiring, avoid along the building structure column or clingy wall installation; Strong and weak electricity cable, unfavorable with slot to reduce interference.
the fifth is to determine the switch grounding requirements: get the line rack PDU grounding walk line including: dc power grounding; Telecommunications equipment cabinet or rack shielding grounding; The inbound communication cable metal sheath or shielding grounding; Open wire or cable inbound arrester grounding and signal cable line for the empty, etc.
the last thing to do is the shield of switch: switch block ( Including space and line block) In addition to the signal and the power cord, exchange room should also make block processing, specific approach is to put the metal door, window, ceiling keel and anti-static special ground floor. In general, the content of cabinet power supply lightning protection measures are, the lightning protection function can't lay particular stress on either side. So as to ensure safety.
if done improperly, lightning protection caused the loss of data or unable to recover data, we would have lost some important data, sometimes, lightning protection, power is just data, so this time, there are times when it was attacked by hackers, data in this way, the trouble is, in short, cabinets protect precision equipment at the same time, to the requirement of PDU is as far as possible to prevent lightning damage to cabinet equipment.
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