At this stage, the power distribution equipment and power supply and distribution system in the petrochemical industry generally use the AC power of the UPS power supply system. After many branches are controlled and processed by low-voltage circuit breakers, they output 24V DC and 110V AC through AC/DC converters or transformers and other equipment to provide electrical loads for the corresponding panels.
The switchboard (box) installed in the petrochemical industry should be installed indoors with good environmental conditions. If outdoor installation is required, areas with harsh environments should be avoided, and distribution boxes (boxes) suitable for the natural environment standards of the installation site should be selected.
Due to the needs of manufacturing, there are many pump loads in the petrochemical industry, and many pump loads are equipped with soft starters. The use of soft starters further increases the pulse current content of power distribution equipment systems in the petrochemical industry. At present, most soft starters use 6 single-pulse rectifiers to convert AC current into DC, and the resulting harmonics are mainly 5th, 7th and 11th harmonics. The harm of harmonics in petrochemical system software is specifically manifested in the harm to power engineering and the error of accurate measurement. Scientific research shows that harmonic currents will cause additional loss to transformers, which may lead to overheating, accelerate the aging of insulating materials and lead to insulation damage. The presence of pulse current will increase the apparent power and have a significant negative impact on the efficiency of the transformer. At the same time, harmonics directly have a negative impact on capacitors, circuit breakers, and relay protection equipment in the power system. For many testing instruments, the real root mean square value cannot be measured, but the average value can be measured, and then the imaginary waveform is multiplied by the positive index to obtain the reading value. When the harmonics are serious, such readings will have large deviations, resulting in measurement deviations.
Problems you may encounter?
1. Starting problems of various blowers and pumps
2. The frequency converter generates a large number of harmonics, which affects the safe operation of electrical equipment in the system
3. Invalid fines caused by relatively low power factor (according to the “Power Factor Adjustment Electricity Fee Measures” formulated by the Ministry of Water Resources and Electric Power of our company and the Price Bureau of our company).
4. The petrochemical industry is a high-energy-consuming company. Due to changes in our company’s electricity consumption policies and regulations, it may be affected by differences in electricity charges.
Our solution:
1. Install hy-type high-voltage reactive power automatic compensation equipment on the 6kV, 10kV or 35kV side of the system to compensate system reactive power, improve power factor, design effective reactance rate, and partially automatically control system pulse current;
2. The high-voltage side of the system uses a power quality dynamic recovery system to dynamically compensate reactive loads in real time and maintain the reliability of the power quality of the system;
3. The active filter Hongyan APF is installed on the low-voltage 0.4kV side to manage the system harmonics, and the static safety compensation device is used to compensate the reactive power of the system to improve the power factor.
Post time: Apr-13-2023