■QBT ★ active ballast lightning rod
QBT ★ active ballast lightning rod is one kind of effective anti-thunder equipment that is produced according to the tip discharge principle, enforcing charge accumulating ability of ballast lightning rod, enhancing the strength of top electric field and reducing the peak value of discharge. This kind ballast lightning rod accords the criterion of NFC17-102 and the national criterion of GB50057-94 lightning protection design code of buildings . This technique has got national patent (ZL 03 2 21130.9)
■ three disfigurement in traditional ballast lightning rod
● The protection diameter is small and unstable, which is easy to produce the phenomenon of circle strike.
● The passive accepting lightning will form large discharge current and produce strong cross current electromagnetism in the margin and have strong damage for the communication electronic equipments.
● The earth electronic potential produced by the discharge current earthing will cause the beat back phenomenon, which will cause hidden trouble for the security of staff and equipment.
■ Advantage of QBT ★
● Using the specialty of sphere conductor enhancing voltage and through the special technique of QBT ★ , it makes the high frequency impulse caused by dynamic lightning put on the pinpoint of QBT ★ repeatedly to make the electronic ion of pinpoint pre-discharge; attack the air medium and send lightning flow upward and form upward precursor; counteract with the downward precursor caused by the long distance and lightning cloud to reduce the strength of electric field among low clouds to reach the aim of anti-thunder.
● Because the main discharge course happened in air, the charge offered by QBT ★ is limited, therefore, the breadth value of QBT ★ discharge current is small and the gradient is ＜ 5KA/ μ s; therefore, it avoids and reduces the damage rate for equipment and staff caused by inducing electromotive force and potential that produced by strong discharge current.
● The leading lightning distance caused by QBT ★ can make the protection range become large.
(look over the detailed information on internet)
Counting method of protection diameter
According to the international criterion :NFC17-102：
Protection diameter : 
RP-protection diameter H-the protected plane is the distance of pinpoint
△ L-is the pre-discharge distance( △ L ＝ V. △ T) D-is the diameter of grounder
| Protection Type |
Ⅰ(m) |
Ⅰ(m) |
Ⅰ(m) |
| Diameter of Grounder (D) |
20
(GB50057-94为30)
|
45 |
60 |
| QBT S.3000 Pre-discharge distance |
25 |
25 |
25 |
| QBT S.4000 Pre-discharge distance |
40 |
40 |
40 |
| QBT S.4000 Pre-discharge distance |
50 |
50 |
50 |
| QBT S.5000 Ⅰ Pre-discharge distance |
60 |
60 |
60 |
Please refer the following table if the real measuring result is different with counting.
| Measuring result of protection diameter of lightning rod in different types and different height on kinds of buildings |
| QBT* Pinpoint Height |
H
Height(m) H |
| 3 |
5 |
7 |
9 |
12 |
18 |
30 |
45 |
60 |
| ⅠAnti-thunder building |
|
| QBT S.3000 |
|
29 |
49 |
50 |
51 |
52 |
53 |
55 |
|
| QBT S.4000 |
|
30 |
65 |
66 |
68 |
69 |
70 |
70 |
|
| QBT S.5000 |
|
30 |
76 |
76 |
77 |
79 |
80 |
80 |
|
| ⅡAnti-thunder building |
|
| QBT S.3000 |
41 |
57 |
59 |
61 |
62 |
64 |
68 |
70 |
|
| QBT S.4000 |
45 |
75 |
76 |
77 |
78 |
80 |
83 |
85 |
|
| QBT S.5000 |
45 |
86 |
87 |
88 |
89 |
91 |
93 |
95 |
|
| ⅢAnti-thunder building |
|
| QBT S.3000 |
50 |
65 |
66 |
69 |
70 |
75 |
84 |
89 |
|
| QBT S.4000 |
57 |
84 |
85 |
87 |
88 |
92 |
90 |
115 |
|
| QBT S.5000 |
60 |
95 |
96 |
98 |
99 |
103 |
110 |
128 |
|
■Product Sort
| Lightning Rod |
Type |
Sphere(mm) |
Standard Height |
Material |
Order No. |
| Active ballast lightning rod |
QBT ★S.3000 |
φ200 |
1200 |
stainless steel |
5600 |
| QBT ★S.4000 |
φ300 |
1200 |
stainless steel |
5601 |
| Active type lightning rod |
QBT ★S.5000 |
φ600 |
|
gild |
5602 |
| QBT ★S.5000Ⅰ |
φ600 |
|
stainless steel |
5603 |
|
