Electronic information
Power quality and power equipment harmonic control
In Electronic Infomation Category: R | on November 1, 2010
1. Overview
recent years, the power grid in the gradual increase of nonlinear loads is a common trend around the world, such as variable frequency drive or SCR DC drives, computers, important uninterruptible power supply used in the load (UPS), energy-saving fluorescent light system, which will lead to power pollution nonlinear loads, power quality decline, causing trouble for the electrical equipment, and ULN2803A datasheet and even lead to serious fire accidents. Some of the world, including the building of the fire proved to burst with the power pollution.
power pollution and ULN2803A price and power quality deterioration primarily in the following areas: voltage fluctuations, surges, shock, harmonics, phase unbalance, etc.
2. power pollution hazards
power pollution would cause serious harm to electrical equipment, are:
interfere with communications equipment, computer systems and ULN2803A suppliers and other electronic devices work properly, resulting in data loss or crashes.
of radio transmission systems, radar systems, nuclear magnetic resonance device performance, resulting in image noise and disturbance.
caused by electrical malfunction automatic device, or even serious accidents.
the overheating of electrical equipment, vibration and noise increase, accelerated insulation aging, shorten life, or even failure or fire.
light levels caused by fluctuations (flicker), affecting work efficiency.
lead to increased power supply system power loss.
3. the power type of pollution
3.1 Voltage fluctuations and flicker
sine wave voltage fluctuation is more than the peak, over a period of time (less than) standard voltage, about a half cycle to several hundred from the cycle, from 10MS to 2.5 seconds, including over-voltage fluctuations and voltage fluctuations. General arrester and over voltage protection, over voltage fluctuations can not be eliminated completely, because they are used to eliminate the transient pulse. General arrester pressure limiting action there is considerable resistance, taking into account its thermal capacity (char), these devices can easily be destroyed, but can not provide future protection. This situation is often very easy to overlook, which is leading the computer, control systems and sensitive equipment failure or shutdown of the main reasons.Another situation is the opposite
voltage fluctuations, it refers to the number of sine wave peak, a period of time less than the standard voltage value, or as commonly referred to as : shaking or landing. A long period of low voltage condition may be caused by the power company or the user overload caused this phenomenon may be an accident or planned arrangements. More serious is the loss of pressure, it is mostly due to the distribution network within the division and caused heavy load, such as large motors, central air conditioning system and the electric arc and other start and stop and switch, fuse, circuit breaker trip, etc. These lead to voltage distortion are often the reason.
recent years, the power grid in the gradual increase of nonlinear loads is a common trend around the world, such as variable frequency drive or SCR DC drives, computers, important uninterruptible power supply used in the load (UPS), energy-saving fluorescent light system, which will lead to power pollution nonlinear loads, power quality decline, causing trouble for the electrical equipment, and ULN2803A datasheet and even lead to serious fire accidents. Some of the world, including the building of the fire proved to burst with the power pollution.
power pollution and ULN2803A price and power quality deterioration primarily in the following areas: voltage fluctuations, surges, shock, harmonics, phase unbalance, etc.
2. power pollution hazards
power pollution would cause serious harm to electrical equipment, are:
interfere with communications equipment, computer systems and ULN2803A suppliers and other electronic devices work properly, resulting in data loss or crashes.
of radio transmission systems, radar systems, nuclear magnetic resonance device performance, resulting in image noise and disturbance.
caused by electrical malfunction automatic device, or even serious accidents.
the overheating of electrical equipment, vibration and noise increase, accelerated insulation aging, shorten life, or even failure or fire.
light levels caused by fluctuations (flicker), affecting work efficiency.
lead to increased power supply system power loss.
3. the power type of pollution
3.1 Voltage fluctuations and flicker
sine wave voltage fluctuation is more than the peak, over a period of time (less than) standard voltage, about a half cycle to several hundred from the cycle, from 10MS to 2.5 seconds, including over-voltage fluctuations and voltage fluctuations. General arrester and over voltage protection, over voltage fluctuations can not be eliminated completely, because they are used to eliminate the transient pulse. General arrester pressure limiting action there is considerable resistance, taking into account its thermal capacity (char), these devices can easily be destroyed, but can not provide future protection. This situation is often very easy to overlook, which is leading the computer, control systems and sensitive equipment failure or shutdown of the main reasons.Another situation is the opposite
voltage fluctuations, it refers to the number of sine wave peak, a period of time less than the standard voltage value, or as commonly referred to as : shaking or landing. A long period of low voltage condition may be caused by the power company or the user overload caused this phenomenon may be an accident or planned arrangements. More serious is the loss of pressure, it is mostly due to the distribution network within the division and caused heavy load, such as large motors, central air conditioning system and the electric arc and other start and stop and switch, fuse, circuit breaker trip, etc. These lead to voltage distortion are often the reason.