TISP61089A
DUAL FORWARD-CONDUCTING P-GATE THYRISTORS
PROGRAMMABLE OVERVOLTAGE PROTECTORS
JUNE 1999
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 TISP61089A 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
TISP61089A will survive this as its rating for this condition will be 60 A. Similarly the TISP61089A will survive
the 2x56 A 2/10 as its rating is 2x120 A.
table 1. first-level surge currents
OPEN-CIRCUIT
VOLTAGE
V
2500
2500
1000
600
1000
SHORT-CIRCUIT
CURRENT
A
500
360
100
100
100
GENERATOR
FICTIVE
SOURCE
RESISTANCE
Ω
5
4+3
10
6
10
TOTAL CIRCUIT
RESISTANCE
Ω
45
47
50
46
50
I
T
A
2x56
2x53
2x20
2x13
2x20
WAVE SHAPE
2/10
1.2/50, 8/20
(See Text)
10/360
10/1000
10/1000
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 TISP61089A 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
TISP61089A will survive these peak current values as they are lower than the TISP61089A ratings.
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
TISP61089A will survive the 2x100 A 2/10 surge as its rating is 2x120 A.
Under this condition the average rate of current rise will be 100/2 = 50 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. The 2/10
generator has a fictive output resistance 10
Ω,
(5000/500), and GR-1089-CORE compensates for this by
adding an extra 8
Ω
in the output of the 1.2/50-8/20 generator. In practice, the extra 8
Ω
causes the
PRODUCT
INFORMATION
9
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