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Power failure uninterruptible power supply,uninterruptible power supply in canada,UPS,UPS in canada
Total loss of utility power: Causes electrical equipment to stop working.
A power outage (Also power cut, power failure or power loss) is the loss of the electricity supply to an area.
The reasons for a power failure can for instance be a defect in a power station, damage to a power line or other part of the distribution system, a short circuit, or the overloading of electricity mains. |
Voltage sag
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Transient (short term) under-voltage: Causes flickering of lights.
Sags are caused by start-up many electrical devices and motors or short circuit some other load on power line. |
Voltage spikeuninterruptible power supply,uninterruptible power supply in canada,UPS,UPS in canada
Transient (short term) over-voltage ie spike or peak: Causes wear or acute damage to electronic equipment.
Voltage spikes are fast, short duration electrical transients (overvoltages) in the electric potential of a circuit. These are typically caused by lightning strikes, although power outages, tripped circuit breakers, short circuits, power transitions in other large equipment on the same power line, and malfunctions caused by the power company can also cause them. Other transients can be created by an electromagnetic pulse (EMP) with electromagnetic energy distributed typically up to the 100 kHz and 1 MHz frequency range. Pulse produced by a nuclear explosion detonation are called nuclear electromagnetic pulse (NEMP) with energy distributed in frequencies from 1 kHz into the Gigahertz range.
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Under-voltage (brownout)
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Low line voltages for an extended period of time
.Low line voltage form a few minutes to few days.
Line power and power distributor failures, heavy loads over than capacity is connect to line.
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Blackouts and Mains Failures uninterruptible power supply,UPS,UPS in canada
when the mains supply fails completely this is known as a total mains failure or blackout. A break in the mains supply of only several milliseconds is sufficient enough to crash, lock or reset many of the components that make up a typical data or voice processing IP network, such as PC, terminal, console, server, PBX, printer, modem, hub or router.
A survey can be used to identify the types, duration and magnitude of power problems experienced on a site.
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Over-voltage uninterruptible power supply,uninterruptible power supply in canada,UPS,UPS in canada
Increased voltages for an extended period of time.
The conditions may be hazardous. Depending on its duration, the overvoltage event can be permanent or transient, the latter case also being known as a voltage spike.
Electronic and electrical devices are designed to operate at a certain maximum supply voltage, and considerable damage can be caused by voltage that is higher than that for which the devices are rated. |
Line noise uninterruptible power supply,uninterruptible power supply in canada,UPS,UPS in canada
distortions superimposed on the power waveform: Causes electro magnetic interference.
noise has the following meanings:
| 1- An undesired disturbance within the frequency band of interest; the summation of unwanted or disturbing energy
introduced into a communications system from man-made and natural sources.
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2- A disturbance that affects a signal and that may distort the information carried by the signal.
Random variations of one or
more characteristics of any entity such as voltage, current, or data.
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| 3- A random signal of known statistical properties of amplitude, distribution, and spectral density.
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| 4- Loosely, any disturbance tending to interfere with the normal operation of a device or system.uninterruptible power supply,uninterruptible power supply in canada,UPS,UPS in canada |
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Frequency variation
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Deviation from the nominal frequency (50 or 60 Hz): Causes motors to increase or decrease speed.
Unsteady frequency with high tolerance. |
Switching transient
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Instantaneous Undervoltage( Notch ) in the Range of Nanoseconds: May cause erratic behavior in some equipment, memory loss, data error, data loss and component stress. |
Harmonic distortion
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Multiples of power frequency superimposed on the power waveform: Causes excess heating in wiring and fuses
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