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1、electricity blackout

Definition

Voltage is zero, continuing for more than two cycle

Cause

Power circuit breaker and dancing, power supply failure

Hazard

Equipment downtime caused by the non-normal data loss or data errors, or even hardware damage caused by

Countermeasures

On-line, interactive, back-up type UPS, can effectively protect the load from the power outage hazards

2、low voltage

Definition

Consistently lower than the nominal voltage (RMS value) 85% of the longer period of time

Cause

Starts and continued to run high-power devices, power grids, internal and external network access, network overload

Hazard

Electrical equipment hardware failure occurred in advance of equipment downtime or data loss

Countermeasures

On-line, interactive, back-up type UPS, can effectively make the load from the low-voltage hazards

3、voltage fluctuation

Definition

Voltage below the normal voltage range (RMS value) of 85% or above 125%, continuing the cycle of period two cycle fluctuations in

Cause

Frequent start and stop high-power devices, high-starting current devices frequently start and stop

Hazard

Equipment, premature aging, the system of non-normal reset, shutdown, restart, data loss

Countermeasures

On-line, interactive, back-up type UPS, can effectively provide protection against voltage fluctuation

4、Voltage Surge

Definition

Voltage exceeds the normal voltage range (RMS value) of 150% or more, sustained for more than one cycle of transient high-voltage, any conductor (including cables and data lines) can be transmitted Surge

Cause

High-power electrical equipment out  from electric line

Hazard

Equipment burning occurs, the data error or loss, sudden shutdown

Countermeasures

On-line, interactive UPS, can effectively provide protection against voltage surges

5、high voltage spikes

Definition

In the 100ms to 1 / 2 cycle of voltage rose rapidly to peak 6000Vac

Cause

String into the lightning, high-capacity switch-off, electrostatic discharge

Hazard

Data loss or errors, hardware damage, circuit board burning

Countermeasures

On-line, interactive UPS, can effectively provide protection against high voltage spikes

6、cis-state peak

Definition

In the 10ms to 100ms of voltage up to 20000Vac

Cause

String into the lightning, high-capacity switch-off, electrostatic discharge

Hazard

Data loss or errors, hardware damage, circuit board burning

Countermeasures

Only AC / DC / AC structure, on-line UPS can provide effective protection Shun-state peak

7、harmonic interference

Definition

Power waveform distortion, sine-degree beyond a certain range of

Cause

There are thyristor rectifier power supply circuit devices, high-pollution equipment running back, transformer coil saturation

Hazard

High-order harmonic emission will affect the communication and signal quality, data error rate, ± low-order harmonics will affect the operational life of equipment

Countermeasures

Only AC / DC / AC structure, on-line UPS can provide effective protection of harmonic interference

8、line noise

Definition

Radio frequency interference (RFI) electromagnetic interference (EMI) impact of other frequencies

Cause

High-frequency switching devices, motor control equipment, radio transmission microwave communication equipment running

Hazard

Communications or data transmission failure, system crash

Countermeasures

Only AC / DC / AC structure, on-line UPS can provide effective protection against line noise

9、the frequency fluctuation

Definition

Power frequency changed significantly more than ± 0.5Hz

Cause

Network overload, network equipment failure or frequency characteristics of poor, oil-powered machines

Hazard

The frequency-sensitive equipment, causing disruption or termination of the operation is running, equipment, shortened life expectancy

Countermeasures

Only AC / DC / AC structure, on-line UPS can provide effective protection against fluctuations in the frequency