the same holding method which will be used for mounting in the enclosure.
The pulse generator shall be connected between the spark gap terminal and
the enclosure (or plate) with a minimum inductance connection. The pulse
generator shall be capable of providing a ramp voltage of 1 kV/ns to a peak
voltage which is at least twice the open circuit impulse sparkover voltage.
Voltage across the spark gap shall be monitored on an oscilloscope or
transient digitizing recorder, capable of at least 1 ns resolution. The
peak transient voltage during the pulse is the impulse sparkover voltage.
Response time shall be less than 4 nanoseconds. Clamping voltage of the
ESA shall be less than [900] [_____] volts at a current pulse of 10 kA.
ESA clamping voltage measurements shall be performed with the ESAs mounted
in the filter/ESA assembly enclosure or mounted on a metal plate by the
same holding method which will be used for mounting in the enclosure. The
pulse generator shall be connected between the ESA terminal and the
enclosure (or plate) with a minimum inductance connection. The pulse
generator shall be capable of providing a 10 kA current pulse, on an 8- by
20-microsecond waveshape into the ESA. Current through the ESA and voltage
across the ESA shall be monitored on oscilloscopes or transient digitizing
recorders. The asymptotic voltage during the 10 kA portion of the pulse is
the clamping voltage.
2.7.1.4
ESA Extinguishing Characteristics
The ESA shall extinguish and be self-restoring to the normal nonconductive
state within one-half cycle at the operating frequency. The ESA
extinguishing test shall be performed with the ESA mounted in the
filter/ESA assembly enclosure or mounted on a metal plate by the same
holding method which will be used for mounting in the enclosure. The
extinguishing test shall use an ac power source connected between the ESA
terminal and ground which shall be at the rated voltage and frequency
capable of providing at least 25 amperes into a short-circuit load. A
pulse generator capable of providing a short pulse which will fire the ESA
shall also be connected across the ESA. Voltage across the ESA shall be
monitored on an oscilloscope or transient digitizing recorder. A series of
ten pulses shall be injected. Performance of the ESA is satisfactory if
the arc extinguishes (indicated by re-occurrence of the sinusoidal
waveform) within 8.5 milliseconds after the start of each pulse.
2.7.1.5
ESA Extreme Duty Discharge Current
The ESA shall be rated to survive the extreme duty discharge current of a
single 8- x 20-microsecond pulse with a 10 to 90 percent rise time of 8
microseconds and fall time to a value of 36.8 percent of peak in 20
microseconds. The ESA for high voltage power lines (above 600 volts) shall
have an extreme duty discharge capability equal to or greater than 70 kA.
The ESA for low voltage power lines (below 600 volts) to such things as
building interiors, area lighting, and external HVAC equipment shall have
an extreme duty discharge capability equal to or greater than 50 kA. The
ESAs for control circuits such as interior alarms, indicator lights, door
access controllers, HVAC controls, and telephones, shall have an extreme
duty discharge capability equal to or greater than 10 kA. The ESA extreme
duty discharge test shall be performed with the ESA mounted in the
filter/ESA assembly enclosure or mounted on a metal plate by the same
holding method which will be used for mounting in the enclosure. A pulse
generator shall be connected between the ESA terminal and the enclosure (or
plate) with a minimum inductance connection. The pulse generator shall be
capable of supplying an 8- x 20-microsecond waveshape and a only single
pulse is required. Current through the ESA and voltage across the ESA
shall be monitored on oscilloscopes or transient digitizing recorders. The
SECTION 13095A
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