Littelfuse BA_BB Varistor Series Manual do Utilizador descarregar pdf (Página 3)

153

Revised: May 8, 2013

Varistor Products

BA/BB Varistor Series

Industrial High Energy Terminal Varistors > BA/BB Series

Speciﬁcations are subject to change without notice.

Please refer to www.littelfuse.com/series/ba or /bb.html for current information.

HI–ENERGY

MOV’S

BA/BB Series

TYPICAL TEMPERATURE COEFFICIENT

OF POWER DISSIPATION = 2.2%/

MAX AT T

= 85

MAX AT T

= 25

TYP AT T

= 25

1. 0

0.8

0.6

0.4

0.2

0.1

0.08

0.06

0.04

80 90 100 110

PERCENTAGE OF MAXIMUM RATED V

RMS

(%)

POWER DISSIPATION (W) PER kV

OF RATED V

RMS

Stand by Power Dissipation vs Applied V

Rms

at Varied

Temperatures

Typical Stability of Standby Power Dissipation at Rated

RMS

vs Time

1,000 HOURS, T

= 85

0.5

0.4

0.3

0.2

0.1

0 10 100 1,000

POWER DISSIPATION (W) PER kV

OF RATED V

RMS

TIME AT RATED V

RMS

(HOURS)

Should transients occur in rapid succession, the average power

dissipation required is simply the energy (watt-seconds) per pulse

times the number of pulses per second. The power so developed

must be within the speciﬁcations shown on the Device Ratings

and Characteristics Table for the speciﬁc device. Furthermore,

the operating values need to be derated at high temperatures as

shown in the above diagram. Because varistors can only dissipate

a relatively small amount of average power they are, therefore, not

suitable for repetitive applications that involve substantial amounts

of average power dissipation.

Power Dissipation Ratings

100

-55 50 60 70 80 90 100 110 120 130 140 150

AMBIENT TEMPERATURE (

PERCENT OF RATED VALUE

100

TIME

PERCENT OF PEAK VALUE

Peak Pulse Current Test Waveform

= Virtual Origin of Wave

T = Time from 10% to 90% of Peak

= Rise Time = 1.25 x T

= Decay Time

Example - For an 8/20 μs Current Waveform:

8μs = T

= Rise Time

20μs = T

= Decay Time

Figure 1 Figure 2

Figure 3 Figure 4

1 2 3 4 5

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