Case Introduction

Two gas stations have been installed at a gas station in Zhejiang provinceThe 185kW air compressor has a load current that fluctuates from 0 to 350A during actual operation depending on the gas filling situation, with a power factor of 0.84. The distance between the distribution room and the on-site control cabinet is about 300 meters. Before the renovation, there were the following problems: after the load increased, the air compressor occasionally issued overcurrent alarms, the terminal voltage dropped from 227.5vac to 215vac, and the line loss increased.

Product Introduction

The SFR-L series low-voltage power capacitor module is mainly composed of two (△ type) or one (Y-shaped) compensating capacitors, highly integrated with composite switch modules, microprocessors, and various functional modules. The product adopts a modular structure, with a small size and easy maintenance. Mainly used for reactive power compensation in situations where harmonics are not very severe, it is suitable for on-site compensation, decentralized compensation, and centralized compensation. This series of products adopts double zero crossing switching technology to ensure that overvoltage and high surge current are not generated when switching capacitors, thereby extending the service life of capacitors and the switching life of switches for millions of times. The product has complete protection functions, including special protection for internal temperature of capacitors, harmonic content of the power grid, overcurrent, overvoltage, undervoltage, three-phase imbalance, etc., making the product safer and more reliable. The product can be used in a modular manner, with multiple units automatically generating a master and the rest as slaves, forming a reactive power automatic control system. In case of individual faults, the slave will automatically exit without affecting the operation of other machines. If the master fails, it will automatically exit, generating a new master and forming a new system. The degree of intelligence is *. At the same time, this series of products also integrates the function of power meters, which can measure the conventional electrical parameters of the system.

Application effect

　　After adopting this scheme for reactive power compensation, the expected goal was achieved, and the power factor of the air compressor branch was improved to0.98, the line voltage loss has been reduced to 6vac, the air compressor runs stably (the previous overcurrent alarm has been resolved), purifies the electrical environment, ensures the safe and stable operation of the equipment, and greatly improves the effective utilization rate of electrical energy; Reduced distribution line losses, increased terminal voltage of air compressors, and extended the service life of cables and equipment.