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TISP61089P

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS

Power Innovations Ltd 

TISP61089

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS

PROGRAMMABLE OVERVOLTAGE PROTECTORS

NOVEMBER 1995 - REVISED FEBRUARY 1998

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 TISP61089 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 TISP61089 will

survive this as its rating for this condition will be 60 A. Similarly the TISP61089 will survive the 2x56 A 2/10 as

its rating is 2x120 A.

table 1. first-level surge currents

WAVE SHAPE

2/10

1.2/50, 8/20

(See Text)

10/360

10/1000

10/1000

OPEN-CIRCUIT

VOLTAGE

V

2500

2500

SHORT-CIRCUIT

CURRENT

A

500

360

GENERATOR

FICTIVE

SOURCE

RESISTANCE

Ω

5

4+3

TOTAL CIRCUIT

RESISTANCE

Ω

45

47

IT

A

2x56

2x53

1000

100

10

50

2x20

600

100

6

46

2x13

1000

100

10

50

2x20

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 TISP61089 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. IT column values of 2x83, 2x78, 2x29, 2x19 and 2x29. The

TISP61089 will survive these peak current values as they are lower than the TISP61089 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

TISP61089 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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