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參數(shù)資料
| 型號(hào)： | ISO176P |
| 英文描述： | Precision, Isolated OPERATIONAL AMPLIFIER |
| 中文描述： | 精密，隔離運(yùn)算放大器 |
| 文件頁數(shù)： | 8/8頁 |
| 文件大?。?/td> | 118K |
| 代理商： | ISO176P |
8
ISO176
PARTIAL DISCHARGE
When an insulation defect such as a void occurs within an
insulation system, the defect will display localized corona or
ionization during exposure to high-voltage stress. This ion-
ization requires a higher applied voltage to start the dis-
charge and lower voltage to maintain it or extinguish it once
started. The higher start voltage is known as the inception
voltage, while the extinction voltage is that level of voltage
stress at which the discharge ceases. Just as the total insula-
tion system has an inception voltage, so do the individual
voids. A voltage will build up across a void until its incep-
tion voltage is reached, at which point the void will ionize,
effectively shorting itself out. This action redistributes elec-
trical charge within the dielectric and is known as partial
discharge. If, as is the case with AC, the applied voltage
gradient across the device continues to rise, another partial
discharge cycle begins. The importance of this phenomenon
is that, if the discharge does not occur, the insulation system
retains its integrity. If the discharge begins, and is allowed
to continue, the action of the ions and electrons within the
defect will eventually degrade any organic insulation system
in which they occur. The measurement of partial discharge
is still useful in rating the devices and providing quality
control of the manufacturing process. The inception voltage
for these voids tends to be constant, so that the measurement
of total charge being redistributed within the dielectric is a
very good indicator of the size of the voids and their
likelihood of becoming an incipient failure. The bulk incep-
tion voltage, on the other hand, varies with the insulation
system, and the number of ionization defects and directly
establishes the absolute maximum voltage (transient) that
can be applied across the test device before destructive
partial discharge can begin. Measuring the bulk extinction
voltage provides a lower, more conservative voltage from
which to derive a safe continuous rating.
PARTIAL DISCHARGE TESTING
Not only does this test method provide far more qualitative
information about stress-withstand levels than did previous
stress tests, but it provides quantitative measurements from
which quality assurance and control measures can be based.
Tests similar to this test have been used by some manufac-
turers, such as those of high-voltage power distribution
equipment, for some time, but they employed a simple
measurement of RF noise to detect ionization. This method
was not quantitative with regard to energy of the discharge,
and was not sensitive enough for small components such as
isolation amplifiers. Now, however, manufacturers of HV
test equipment have developed means to quantify partial
discharge. VDE in Germany, an acknowledged leader in
high-voltage test standards, has developed a standard test
method to apply this powerful technique. Use of partial
discharge testing is an improved method for measuring the
integrity of an isolation barrier.
To accommodate poorly-defined transients, the part under
test is exposed to voltage that is 1.6 times the continuous-
rated voltage and must display less than or equal to 5pC
partial discharge level in a 100% production test.
APPLICATIONS
ISO176 isolation amplifiers are used in three categories of
applications:
Accurate isolation of signals from high voltage ground
potentials.
Accurate isolation of signals from severe ground noise and,
Fault protection from high voltages in analog measure-
ments.
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