Summary of Intelligent High Frequency Switching Power Supply System
Originally, lead-acid batteries or cadmium-nickel batteries were used, so it is necessary to set up special battery workers for maintenance, and also to equip relevant containers, instruments, raw materials, distillation pots, distilled water, etc. for battery maintenance. After the transformation, the maintenance-free battery is made of American "Lishi", so a series of maintenance work is not needed at ordinary times, which reduces manpower and material resources.
The power factor of the original phase-controlled power supply is low, generally below 0.7, and the efficiency is about 60%, while the power factor of the reformed intelligent high-frequency switching power supply is above 0.9 and the efficiency is above 94%.
The original phase-controlled power supply often fails, sometimes resulting in loss of crude oil production due to the inability to operate power transmission. For example, on September 23, 1997, a 110kV substation was tripped by a DC system failure, and the whole station lost power, burning 35kV lines for 3 kilometers, and its economic loss was as high as more than 4 million yuan; In recent years, various faults often occur in DC systems, which have caused great losses to oil and gas production, inconvenience to residents' lives and huge economic losses to industrial users. After being transformed into an intelligent high-frequency switching power supply, the DC system has not had any accidents so far, and the power supply is more reliable.
After transformation, the intelligent high-frequency switching power supply has a 48V power outlet, which provides power for the communication network of the substation, and there is no need to purchase a special 48V power supply, thus reducing the investment and occupied space of the equipment.
The reformed control bus has the following three ways to supply power, which ensures that the power supply of the control bus is reliable and foolproof.
—— When the alternating current is normal, the control bus can be directly powered by the rectifier module;
-In case of AC power loss, power is supplied by the step-down module;
—— Power is supplied to the control bus from 90% voltage of the battery through diodes.
Because the reformed intelligent high-frequency switching power supply system has stable performance, high precision, stronger safety and reliability, and many points, it has received good results and achieved obvious social and economic benefits, providing reliable power guarantee for oil and gas production and other loads in Zhongyuan Oilfield. At the same time, it lays a foundation for substation automation.
