TISP61089A

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS

PROGRAMMABLE OVERVOLTAGE PROTECTORS

12

JUNE 1999

P R OD U C T

INF O RMA T ION

Using a 25

Ω series resistor will result in table 5. I

and 2x2.9. The TISP61089A will probably fail for a peak current level of 2x24 A and the series current limiting

element must operate in under 0.1 s to prevent exceeding the TISP61089A package limit. For 2x7.7 A, the

series current limiting element must operate within 0.35 s for TISP61089A survival.

section 4.5.15 - second-level power fault testing with wiring simulator

The purpose of this test is to ensure that the telephone cable does not become a hazard due to excessive

current. A series fuse, type MDQ 1-6/10A, simulates the safe current levels of a telephone cable. If this fuse

opens the equipment fails the test. For the equipment to pass, the equipment series overcurrent element must

reduce the current to below the MDQ 1-6/10A fusing level to prevent the simulator operating. The a.c. test

voltage can range from zero to 600 V, which gives a maximum conductor current of 10 A. Table 6 shows the

simulator fusing times for three current levels.

Using a 25

Ω series resistor will result in table 6. I

operating times will be

∞, 12 s and 0.4 s respectively

For the equipment to pass this test, the TISP61089A series current limiting element must operate before the

MDQ 1-6/10A fusing times shown in table 7.

overcurrent protection

To meet ‘1089, the overcurrent protection must be coordinated with the requirements of sections 4.5.7, 4.5.8,

4.5.9, 4.5.12, 4.5.13, 4.5.15 and the TISP61089A. The overcurrent protection must not fail in the first level

tests of sections 4.5.7, 4.5.9 and 4.5.12. Recoverable overcurrent protectors (e.g. Positive Temperature

Coefficient Resistors) may operate during first level testing, but normal equipment working must be restored

table 6. second-level power fault currents with MDQ 1-6/10A fuse

A.C.

DURATION

s

OPEN-CIRCUIT

RMS VOLTAGE

V

SHORT-

CIRCUIT

CURRENT

A

SOURCE

RESISTANCE

Ω

TOTAL

CIRCUIT

RESISTANCE

Ω

A

A

TIME

TO

OPEN

s

1000

100

5

20

60

1.7

2.4

∞

1000

300

15

20

60

5.0

7.1

30

1000

600

30

20

60

10

14

0.7

table 7. operating times of MDQ 1-6/10A fuse

TIME TO

OPERATE

s

A

0.2

17

0.5

12

19

57

10

6.8

1000

2.5