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|
|Isolation Transformer||Yes||No||No||No||No (3)||No||Yes||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|
(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.