|Calaulation of TQYF lightning rod is protective radius|
|Based on NFC17-10 provision, the needlepoint should be higher than horizontal plane of proteched object 2M (h1),its protective range (radius) separately is Rp2,Rp3,Rpn correspondingly provided the installation height of lighting rod separately is h2,h3¡hn etc.|
It should take the lightning protection protection class of protected object,local thunderstorm and geologicl landform circumstance etc accout when setting calculation of mula.
The protective radius of TQYF model is related to height(h)¡¢staring anticipating time¡¢model of lightning rod and chosen protective class :when h¡Ý5
|Notes:the Rp in formula represents protective radius on horizontal plane considered|
¡ó h represents height difference between needlepoint and top of protected object;
¡ó D represents upward anticipating (distance)
¡ó ¡÷L represents upward anticipating (distance)
¡ó ¡÷=V (meter/microsecond)¡Á¡÷T (microsecond)
¡ó V represents lead transmission speed,experiment data indicates; V1 meter/microsecond Based on France national-standard NFC17-102
¡ó The 1st kind building is 20m (GB50057-94 specifies :D=30m)
¡ó The 2st kind building is 45m
¡ó The 3st kind building is 60m
When h<5, protective radius refers to table
|The corresponding protective radius(Rp),protective type of different lightning protectin building to TQYF lightning rod of different model and installation height|
|H=the height over protected object(m)|
|The 1st kind lightning protection building(radius of grounder is 30m)|
|The 1st kind lightning protection building(radius of grounder is 45m)|
|The 1st kind lightning protection building(radius of grounder is 60m)|
|Calculation of TQYF lightning rod¡¯s protective radius|
Model and performance
Model and performance of TQYF lightning rod
|Model of lightning rod||Advance discharge gime ¡÷T|
|TQYF ¢ñLightnign rod||25microsecond|
|TQYF ¢òLightnign rod||40microsecond|
|TQYF¢ó Lightnign rod||50microsecond|
|TQYF¢ô Lightnign rod||60microsecond|
Notes:the setting range of above advance discharge time¡÷T value is stipulated in France national lightning protection standard NFC17-102, the actual test value is bigger than given value.
| Installing TQYF lightning rod in our country must strictly abide by obligatory provision stated in lightning protection standard of the People¡¯s Republic of China¡ª[buiding¡¯s lightning protection design morm] (GB50057-94)
¡ó The lightning protection kind of building is determined based on area¡¢height¡¢local thunder & lightning day numbers¡¢geographic environmental correction factor and using characteristic of protected building.
¡ó Determining chosen quantity of TQYF lihting rod based on lighning protection category and building ares.
¡ó The downlead should be electrical-connected with main reinforcing steel of building.or.set two or more downleads according to provision.
¡ó The downlead should be made as off/on clip and insulating protection around the ground
¡ó Earthing body ,earth resistance and lightning protection network must be set in the light of lighning protection standard GB50057-94,
¡ó The guarantee period of lightning protection product is twenty years.
|Installation Master drawing of TQYF lightning rod|