What Are The Hazards of Power System Harmonics?

Harmonics and electromagnetic interference, power factor reduction are listed as the three major public hazards of the power system. Therefore, understanding the mechanism, hazards, detection methods and treatment methods of harmonic is of great significance to ensure the safe operation of the power system. GDZX mainly introduces the hazards of harmonics in this article.

Harmonic Waveform and Current

What are the hazards of power system harmonics? 

1. Harmonics will cause additional losses in power equipment in the utility grid, reducing the efficiency of power generation, transmission and power equipment. A large number of third harmonics flowing through the center line can overheat the line and can even cause a fire.

2. Harmonics will affect the normal operation of electrical equipment, causing mechanical vibration and noise failure of the motor. The transformer is partially overheated, capacitors, cables and other equipment are overheated, the insulation part is aging and deteriorated, and the life of the equipment is reduced until it is finally damaged.

3. Harmonics can cause grid resonance, which may amplify harmonic currents several times or even tens of times, which poses a major threat to the system, especially for capacitors and reactors connected in series. The grid resonance often causes it to burn.

4. Harmonics can cause relay protection and automatic device malfunction, resulting in unnecessary power interruptions and losses.

5. Harmonics can make electrical measurement instruments inaccurate, produce measurement errors, and bring direct economic losses to power supply departments or power users.

6. Harmonics can cause interference to communication systems in the vicinity of the device, which can generate noise and reduce communication quality. In the worst case, information is lost and the communication system cannot work normally.

7. Harmonics can interfere with the normal operation of electronic devices such as computer systems, resulting in data loss or crashes.

8. Harmonics can affect the performance of radio transmission systems, radar systems, nuclear magnetic resonance and other equipment, causing noise interference and image disturbance.

After understanding the harmonic hazards of the power system, what methods are available to detect harmonics? Stay tuned for the next section. GDZX is a manufacturer of electric power testing equipment. There are many types of products with different models and good reputation. Welcome to buy!