Buffering equipment
This table shows the effectiveness of certain types of equipment
at mitigating various disturbances.
In the chart, a 'Yes' indicates that a particular piece of equipment will help mitigate
a certain type of disturbance. A 'No' means that the indicated piece of equipment will not help
mitigate a particular disturbance.
Please refer to our terms and definitions page for an
explanation of each type of power quality disturbance.
| Type of Equipment |
Type of Disturbance |
| Transient |
Sag |
Swell |
Interruption |
Distortion (Harmonics) |
Flicker |
Noise |
Frequency Deviation |
| Surge Suppressor |
Yes |
No |
No |
No |
No |
No |
No (1) |
No |
| Filter |
No |
No |
No |
No |
Yes (2) |
No |
Yes |
No |
| Isolation Transformer |
Yes |
No |
No |
No |
No (3) |
No |
Yes |
No |
| Voltage Regulator |
No |
Yes |
Yes |
No |
No |
No |
No |
No |
| Power Conditioner |
Yes |
Yes |
Yes |
No (4) |
No (5) |
No |
Yes |
No |
| Uninterruptible Power Supplies |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
| Standby Power Supplies |
No |
No |
No |
Yes (6) |
No |
No |
No |
No |
Table notes:
(1) Some surge suppressors incorporate filters to reduce noise.
(2) Filter must be properly designed to be effective against harmonic distortion.
(3) Well-designed isolation transformers can reduce some harmonic distortion.
(4) Motor-Generator sets provide limited protection against momentary interruptions.
(5) Motor-Generator sets can protect against harmonic distortion.
(6) Standby Power Supply units may not protect against momentary interruptions.
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