The Necessity of Power Quality Monitoring in Shenyang Electrical Installation Project
The continuous finishing production lines of today's automation equipment are extremely sensitive to disturbances in the power distribution system, and abnormal power supply in a fraction of a second may cause confusion in the factory, and the loss is incalculable. These users' tolerance for unqualified power is strictly 1-2 cycles. The same is true of modern business centers, banks, and hospitals. The serious harm and loss caused by harmonics are often mentioned by people. Sudden crashes of computer systems in unattended substations are mostly power quality problems. Because most of the current domestic researches on power quality control are limited to the scope of harmonic problems, we focus on the harm of harmonics. Harmonics cause system accidents. For example, the interference of harmonics on protection caused the 200MW generator trip of Datong No. 2 Power Plant, causing a large-scale power outage in Beijing, a 220KV meter stop in Henan Power Grid, a large-scale power outage in Zhumadian and Xinyang, the collapse of Shanxi Jindongnan Power Grid, and a large-scale power outage. .
The increasing requirements for power quality and reliability are related to the improvement of user's process level. In the early days of power development, power loads were mainly lit, and people knew that candles were lit immediately after a power outage, so there were not many complaints. However, when the main power load is gradually replaced by industry, agricultural production and commerce, the power interruption will cause considerable losses. Therefore, technical measures such as dual power supplies and protection devices have appeared to improve the reliability of the power supply. The advancement of modern science and technology has also promoted the automation and intelligence of the production process, and has put forward higher and higher requirements for power quality. If the computing center loses power, 2S may destroy data processing results for tens of hours, or cause economic losses of millions of RMB. In large machine manufacturers, a sudden drop in voltage of 0.1S may cause abnormal production conditions and quality loss.
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