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TISP61089AS Datasheet(PDF) 9 Page - Power Innovations Ltd

Part # TISP61089AS
Description  DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS?
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Manufacturer  POINN [Power Innovations Ltd]
Direct Link  http://www.bourns.com
Logo POINN - Power Innovations Ltd

TISP61089AS Datasheet(HTML) 9 Page - Power Innovations Ltd

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PR O D UC T
I N FO R M A T IO N
9
OCTOBER 1999
TISP61089AS
DUAL FORWARD-CONDUCTING P-GATE THYRISTORS
PROGRAMMABLE OVERVOLTAGE PROTECTORS
The values of protector current are calculated from the open circuit generator voltage divided by the sum of
the total circuit resistance. The total circuit resistance is the sum of the generator fictive source resistance and
the TISP61089AS series resistor value. Most generators have multiple outputs and each output connects to
an individual line conductor. For those generators that have a single output, each conductor will have an
effective generator fictive source resistance of n times the generator fictive source resistance, where n is the
number of conductors simultaneously tested.
GR-1089-CORE section 4.5.7 - first-level surge testing
The two most significant test wave shapes in this section are the high energy 10/1000 and the high current
2/10. As shown in table 1, the peak currents for these surges are 2x20 A and 2x56 A respectively. The
protector must survive the 2x20 A 10/1000 surge and the TISP61089AS will do this as its rating is 2x30 A.
When both conductors are surged simultaneously the return (anode) current will be 40 A, again the
TISP61089AS will survive this as its rating for this condition will be 60 A. Similarly the TISP61089AS will
survive the 2x56 A 2/10 as its rating is 2x120 A.
The highest protection voltage will be for the 56 A 2/10 wave shape. Under this condition the average rate of
current rise will be 56/2 = 28 A/µs. The value of diode and thyristor voltage under this condition is specified in
the electrical characteristics.
Compared to TR-NWT-001089, Issue 1, October 1991, GR-1089-CORE, Issue 1, November 1994, adds the
alternative of using the IEEE C62.41 1.2/50-8/20 combination wave generator for the 2/10 test. This generator
usually has a single output and a fictive resistance of 2
Ω. The 2/10 generator has a fictive output resistance
5
Ω, (2500/500), and GR-1089-CORE compensates for this by adding an extra 3 Ω in the output of the 1.2/50-
8/20 generator. In practice, the extra 3
Ω causes the prospective short-circuit current wave shape to be similar
to the 1.2/50 open-circuit voltage wave shape. The TISP61089AS will survive the 2x53 A 1.2/50 as its rating
is 2x100 A.
Using a 25
Ω series resistor will result in table 1. I
T column values of 2x83, 2x78, 2x29, 2x19 and 2x29. The
TISP61089AS will survive these peak current values as they are lower than the TISP61089AS ratings.
GR-1089-CORE section 4.5.8 - second-level surge testing
This is a 2/10 wave shape test. As shown in table 2, the peak current for this surge is 2x100 A. The
TISP61089AS will survive the 2x100 A 2/10 surge as its rating is 2x120 A.
table 1. first-level surge currents
WAVE SHAPE
OPEN-CIRCUIT
VOLTAGE
V
SHORT-CIRCUIT
CURRENT
A
GENERATOR
FICTIVE
SOURCE
RESISTANCE
TOTAL CIRCUIT
RESISTANCE
IT
A
2/10
2500
500
5
45
2x56
1.2/50, 8/20
(See Text)
2500
360
4 + 3
47
2x53
10/360
1000
100
10
50
2x20
10/1000
600
100
6
46
2x13
10/1000
1000
100
10
50
2x20


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