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TISP70xxF3 (LV) Overvoltage Protector Series
APPLICATIONS INFORMATION
Lightning Surge (continued)
ITU-T 10/700 Generator (continued)
V C
2.8 kV
SW
R 2
15 ?
R 3
25 ?
70 A
5/310
T
R
R
T
R
C 1
20 μ F
R 1
50 ?
C 2
200 nF
70 A
G
5/310
G
G
T
10/700 GENERATOR - SINGLE TERMINAL PAIR TEST
T AND G
TEST
R 4
R AND G
TEST
95 A
4/250
R AND T
TEST
25 ?
V C
5.2 kV
SW
R 2
15 ?
R 3
25 ?
95 A
4/250
T
R
C 1
20 μ F
R 1
50 ?
C 2
200 nF
190 A
4/250
G
10/700 GENERATOR - DUAL TERMINAL PAIR TEST
DUAL
T AND G,
R AND G
TEST
Figure 17.
The output rise time is controlled by the time constant of R2 and C2, which is 15 x 200 = 3000 ns or 3 μ s. Virtual voltage rise times are given
by straight line extrapolation through the 30 % and 90 % points of the voltage waveform to zero and 100 %. Mathematically, this is equivalent to
3.24 times the time constant, which gives 3.24 x 3 = 9.73 which is rounded to 10 μ s. Thus, the open circuit voltage rises in 10 μ s and decays in
700 μ s, giving the 10/700 generator its name.
When the overvoltage protector switches, it effectively shorts the generator output via the series 25 ? resistor. Two short circuit conditions
need to be considered: single output using R3 only (top circuit of Figure 18) and dual output using R3 and R4 (bottom circuit of Figure 18).
For the single test, the series combination of R2 and R3 (15 + 25 = 40 ? ) is in shunt with R 1. This lowers the discharge resistance from 50 ? to
22.2 ? , giving a discharge time constant of 444 μ s and a 50% current decay time of 309.7 μ s, which is rounded to 310 μ s.
For the rise time, R2 and R3 are in parallel, reducing the effective source resistance from 15 ? to 9.38 ? , giving a time constant of 1.88 μ s.
Virtual current rise times are given by straight line extrapolation through the 10 % and 90 % points of the current waveform to zero and 100 %.
Mathematically, this is equivalent to 2.75 times the time constant, which gives 2.75 x 1.88 = 5.15, which is rounded to 5 μ s. Thus, the short
circuit current rises in 5 μ s and decays in 310 μ s, giving the 5/ 310 wave shape.
The series resistance from C1 to the output is 40 ? giving an output conductance of 25 A/kV. For each 1 kV of capacitor charge voltage, 25 A
of output current will result.
For the dual test, the series combination of R2 plus R3 and R4 in parallel (15 + 12.5 = 27.5 ? ) is in shunt with R1. This lowers the discharge
resistance from 50 ? to 17.7 ? , giving a discharge time constant of 355 μ s and a 50 % current decay time of 247 μ s, which is rounded to
250 μ s.
For the rise time, R2, R3 and R4 are in parallel, reducing the effective source resistance from 15 ? to 6.82 ? , giving a time constant of 1.36 μ s,
which gives a current rise time of 2.75 x 1.36 = 3.75, which is rounded to 4 μ s. Thus, the short circuit current rises in 4 μ s and decays in 250
μs, giving the 4/250 wave shape.
MARCH 1994 - REVISED SEPTEMBER 2008
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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