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TISP6NTP2A Programmable Protector
APPLICATIONS INFORMATION
Operation of Gated Protectors (continued)
Positive overvoltages (Figure 3) are clipped to ground by forward conduction of the diode section in the TISP6NTP2A. Fast rising impulses will
cause short term overshoots in forward voltage (V FRM).
Central Office Application to Bellcore GR-1089-Core Issue 1
The most stressful impulse for first-level surge testing (section 4.5.7) is the 1000 V, 10/1000 impulse. To limit the circuit current to the
TISP6NTP2A rating of 20 A requires the total circuit resistance to be 1000/20 = 50 ? . Subtracting the generator fictive source impedance of
10 ? gives 40 ? as the required series resistor value for the TISP6NTP2A (R1A, R1B, R2A and R2B). The various first level impulse current
levels are shown in table 1. The maximum 1.2/50 and 2/10 current levels of 56 A are below the TISP6NTP2A ratings of 60 A and 85 A. In table
1, the designation 2x20 means that each conductor has a simultaneous peak current of 20 A and 2x20 = 40 A flows in the anode (ground)
connection.
Ta ble 1 . First-level Surge Currents
Waveshape
2/10
1.2/50
8/20
Open-circuit Voltage
V
2500
2500
Short-c ircuit Current
A
500
500
Generator Resistance
?
5
2 + 3/Wire
Wires Tested
Both
Single
Both
Total Series
Resistance
?
22.5
45
28.5
I T
A
2x56
56
2x53
Single
50
20
10/1000
1000
100
10
Both
25
2x20
Central Office Application to ITU-T Recommendation K.20
The test level of 1000 V 10/700 delivers a peak short-circuit current level of 25 A, which is equal to the TISP6NTP2A rated value. A series
resistor (R1A, R1B, R2A and R2B) is required to ensure coordinated operation with the primary protector at the 4000 V test level. The resistor
value will be set by the sparkover voltage of the primary protector. A sparkover voltage of 300 V will give a 300/25 = 12 ? series resistor.
Local Subscribers Line Equipment to ITU-T Recommendation K.21
The test level of 1500 V 10/700 delivers a peak short-circuit current level of 37.5 A. To limit the circuit current to the TISP6NTP2A rating of 25 A
requires the total circuit resistance to be 1500/25 = 60 ? . Subtracting the generator fictive source impedance of 40 ? gives 20 ? as the
required series resistor value for the TISP6NTP2A. Even at the 1500 V test level, this resistor develops 25x20 = 500 V, which should ensure the
coordination with the primary protector sparkover.
JUNE 1998 - REVISED JULY 2008
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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