TISP7150F3DR View Datasheet(PDF) - Power Innovations Ltd
Part Name
Description
Manufacturer
TISP7150F3DR Datasheet PDF : 25 Pages
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TISP7125F3, TISP7150F3, TISP7180F3, TISP7240F3, TISP7260F3,
TISP7290F3, TISP7320F3, TISP7350F3, TISP7380F3
TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
shunt resistor R1, series resistor R2 and shunt capacitor C2 form the output shaping network.
series feed resistor R3 to connect to one line conductor for single surge
series feed resistor R4 to connect to the other line conductor for dual surging
VC
2.8 kV SW
R2
15 Ω
C1
20 µF
R1
50 Ω
C2
200 nF
R3
25 Ω
70 A
5/310
R
T
R
R
T
70 A
5/310
G
G
G
T
10/700 GENERATOR - SINGLE TERMINAL PAIR TEST
T AND G
TEST
R AND G
TEST
R AND T
TEST
VC
5.2 kV SW
R2
15 Ω
R4
25 Ω
R3
25 Ω
95 A
4/250
95 A
4/250
C1
20 µF
R1
50 Ω
C2
200 nF
10/700 GENERATOR - DUAL TERMINAL PAIR TEST
Figure 33.
T
R
190 A
4/250
G
DUAL
T AND G,
R AND G
TEST
In the normal single surge equipment test configuration, the unsurged line is grounded. This is shown by the
dotted lines in the top drawing of Figure 33. However, doing this at device test places one terminal pair in
parallel with another terminal pair. To check the individual terminal pairs of the TISP7xxxF3, without any
paralleled operation, the unsurged terminal is left unconnected.
With the generator output open circuit, when SW closes, C1 discharges through R1. The decay time constant
will be C1R1, or 20 x 50 = 1000 µs. For the 50% voltage decay time the time constant needs to be multiplied
by 0.697, giving 0.697 x 1000 = 697 µs which is rounded to 700 µs.
The output rise time is controlled by the time constant of R2 and C2. which is 15 x 200 = 3000 ns or 3 µs.
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 µs. Thus the open circuit voltage rises in 10 µs and decays in
700 µs, giving the 10/700 generator its name.
When the overvoltage protector switches it effectively shorts the generator output via the series 25 Ω resistor.
Two short circuit conditions need to be considered: single output using R3 only (top circuit of Figure 33) and
dual output using R3 and R4 (bottom circuit of Figure 33).
For the single test, the series combination of R2 and R3 (15 + 25 = 40 Ω) is in shunt with R1. This lowers the
discharge resistance from 50 Ω to 22.2 Ω, giving a discharge time constant of 444 µs and a 50% current
decay time of 309.7 µs, which is rounded to 310 µs.
For the rise time, R2 and R3 are in parallel, reducing the effective source resistance from 15 Ω to 9.38 Ω,
giving a time constant of 1.88 µs. 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
PRODUCT INFORMATION
15
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