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Characteristics of harmonics of power distribution systems in the petrochemical industry

Click: Time:2022-12-21 15:09:11

Due to the needs of production, there are a large number of pump loads in the petrochemical industry, and many pump loads are equipped with frequency converters. The large number of applications of frequency converters has greatly increased the harmonic content in the power distribution system of the petrochemical industry. At present, the rectification link of most inverters is the application of 6-pulse rectification to convert alternating current into direct current, so the harmonics generated are mainly 5th, 7th and 11th harmonics. The hazards of harmonics in petrochemical systems are mainly manifested in the hazards to power equipment and deviations in metering. Studies have shown that harmonic currents cause additional losses in transformers, which cause overheating, accelerate the aging of the insulation medium, and lead to insulation damage. The presence of harmonics will increase the apparent power, which will have a significant negative impact on the efficiency of the transformer. Meantime....

Petrochemical detailed solutions: Due to the needs of production, there are a large number of pump loads in the petrochemical industry, and many pump loads are equipped with frequency converters. The large number of applications of frequency converters has greatly increased the harmonic content in the power distribution system of the petrochemical industry. At present, the rectification link of most inverters is the application of 6-pulse rectification to convert alternating current into direct current, so the harmonics generated are mainly 5th, 7th and 11th harmonics. The hazards of harmonics in petrochemical systems are mainly manifested in the hazards to power equipment and deviations in metering. Studies have shown that harmonic currents cause additional losses in transformers, which cause overheating, accelerate the aging of the insulation medium, and lead to insulation damage. The presence of harmonics will increase the apparent power, which will have a significant negative impact on the efficiency of the transformer. At the same time, harmonics have a direct negative impact on capacitors, circuit breakers, and relay protection equipment in the power system. For many measuring instruments, instead of measuring the true rms value, the average value is measured, and then the imaginary waveform is a sine wave and multiplied by a correction factor to obtain the reading. In severe harmonics, such readings will have large deviations, resulting in measurement deviations.

  

Problems you may be experiencing?

1. Starting problems of all kinds of fans and pumps

2. The frequency converter generates a large number of harmonics, which affects the safe operation of the electrical equipment in the system

3. Reactive power fines caused by relatively low power factor (according to the "Measures for Adjusting Electricity Charges by Power Factor" formulated by the Ministry of Water Resources and Electric Power and the State Price Administration);

4. Petrochemical industry is a high-energy-consuming enterprise, and due to changes in national electric energy use regulations, it is possible to be implemented differential electricity prices.

  

Our Solutions:

1. Install a medium-voltage reactive power automatic compensation device on the 6kV, 10kV or 35kV side of the system to compensate for the reactive power of the system, improve the power factor, design a reasonable reactance rate, and partially control the harmonics of the system;

2. The power quality dynamic recovery system is adopted on the high-voltage side of the system to dynamically compensate the reactive power in real time and maintain the stable power quality of the system;

3. The active filter ESBEL AHPF is installed on the low-voltage 0.4kV side to control the harmonics of the system, and the static safety compensation device ESBENmr is used to compensate for the reactive power of the system and improve the power factor.


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