ION 7500 / ION 7600 User’s Guide

Detailed Behavior

 

 

3.Voltage Disturbance Duration: the total number of seconds that the voltage was outside the envelope determined by the Sag/Swell module. If several sags or swells occur during one second, only the last one counts toward the total. The Sag/Swell module settings may be used to control the voltage tolerance. If the Sag/Swell module is not enabled, no voltage disturbances are counted.

Terminology

For a better understanding of the Availability framework in ION meters, it is necessary to know the following terms:

Blade-powered meter: the power to run the meter is derived from the Voltage input terminals that are connected to the monitored system. The meter loses power if the monitored system is down.

Auxiliary-powered meter: The power to run the meter is derived from an independent power source. The meter remains powered when the monitored system is down.

Meter uptime: the time the meter is powered and actively monitoring. The time is measured by counting 1-second pulses from a periodic timer module.

Meter downtime: the time the meter is not powered. This time is measured by the meter’s internal clock and made available through the diagnostics module. The diagnostics module downtime register is reset at the beginning of each outage.

Availability: the probability of finding a system in the operating state at some time into the future. Availability is calculated as:

Availability = Time the power system is operating within specifications

Total time of operation*

=Meter uptime - disturbance time Meter uptime + meter downtime

* Where total time of observation = uptime + meter downtime

Unavailability: calculated in the framework and then converted to number of nines, and Availability in percent and parts per million (ppm):

Unavailability = Time the power system is operating outside specifications

Total time of operation*

=

Disturbance time

 

Meter uptime + meter downtime

* Where total time of observation = uptime + meter downtime

Power Availability Technical Note

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Multi-Tech Systems 7500, 7600 manual Terminology
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7500, 7600 specifications

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