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The fast anti - harmonic intelligent power capacitor is designed for the situation where the harmonic content of the power network is large, the reactive power changes rapidly, and ordinary power capacitors cannot operate normally. It uses special technologies and processes and is composed of a circuit breaker, a thyristor, a reactor, and an aluminum - cased low - voltage power capacitor. It has the characteristics of fast response speed, zero - crossing switching of the capacitor, no inrush current impact, effectively prolonging the service life of the capacitor, no amplification effect on harmonics, and can absorb some harmonics.
Normally, when all our power lines are operating normally, it is in a sealed state. The staff will determine whether the equipment inside the cabinet and the circuit breaker are opened and closed normally through information transmission. At the same time, the dehumidifier in the control cabinet controls the air humidity. They are partners in all sealed electrical cabinets and are protective measures for these power cabinets mainly located outdoors.
@Intelligent Reactive Power CompensationCapacitoris an intelligent reactive power compensation device for the 0.4kV low - voltage distribution network to reduce line losses, improve the power factor, improve power quality, and save energy and reduce consumption. Based on the reactive power compensation scheme designed by theIntelligent Reactive Power CompensationController, the following principles can be referred to
| Non - linear load ratio | Reactive power compensation design scheme | | | |
| Three - phase balanced static load | Three - phase unbalanced static load | Three - phase balanced frequently changing load | Three-phase unbalanced and frequently changing loads | |
| Non-linear equipment in the load ≤ 15% of transformer capacity (mainly linear loads) | Three-phase common compensation, zero-crossing switching of composite switches, | Phase-separated compensation or mixed compensation, Zero-crossing switching of composite switches; | Three-phase common compensation, dynamic switching of thyristor switches | Phase-separated compensation or mixed compensation, Dynamic switching of thyristor switches; |
| 15% | Three-phase common compensation Zero-crossing switching of composite switches Connect 6% or 12% filtering reactance in series in the capacitor circuit | Phase-separated compensation or mixed compensation Zero-crossing switching of composite switches Connect 6% or 12% non-tuned filtering reactance in series in the capacitor circuit | Three-phase common compensation Dynamic switching of thyristor switches Connect 6% or 12% non-tuned filtering reactance in series in the capacitor circuit | Phase-separated compensation or mixed compensation Dynamic switching of thyristor switches Connect 6% or 12% non-tuned filtering reactance in series in the capacitor circuit |
| Harmonic governance target | Destroy the parallel resonance between the capacitor and the system, and partially absorb the 3rd, 5th, 7th and higher harmonics in the system | Destroy the parallel resonance between the capacitor and the system, and partially absorb the 3rd, 5th, 7th and higher harmonics in the system. | Destroy the parallel resonance between the capacitor and the system, and partially absorb the 3rd, 5th, 7th and higher harmonics in the system. | Destroy the parallel resonance between the capacitor and the system, and partially absorb the 3rd, 5th, 7th and higher harmonics in the system. |
| The ratio of non-linear equipment in the load > 50% of the transformer capacity (there are a large number of harmonics). | Three-phase common compensation. The composite switch switches at zero-crossing. A tuned filter circuit composed of capacitors or reactors. | Phase-separated compensation or mixed compensation. The composite switch switches at zero-crossing. A tuned filter circuit composed of capacitors or reactors. | Three-phase common compensation. The thyristor switch switches dynamically. A tuned filter circuit composed of capacitors or reactors. | Phase-separated compensation or mixed compensation. The thyristor switch switches dynamically. A tuned filter circuit composed of capacitors or reactors. |
This type of product is the main product in Europe, America, etc. Self-healing low-voltage shunt capacitors are suitable for power frequency AC power systems with a nominal voltage of 1 kV and below, to improve the power factor, reduce reactive power loss, and improve the voltage quality. The capacitor is equipped with a discharge resistor, which can reduce the residual voltage from 2UN to below 75V within 3 minutes after the power is disconnected, ensuring operational safety; the unit uses a cylindrical aluminum stretched shell, and this structure has double protection, eliminating the hazard of leakage. MODBUS is a very cost-effective short-distance and low-cost communication solution, but it also has disadvantages, such as low real-time performance, limited data transmission volume, low communication speed, and being easily interfered with. However, the advantages outweigh the disadvantages. We cannot avoid the problem because of its shortcomings. On the contrary, we should constantly discover and solve its loopholes to improve the reliability of the equipment. Today, I will share with you some experiences in the process of applying MODBUS communication. Wiring First of all, your MODBUS cable must not be placed in the cable tray. Some people always put the communication cable in the cable tray for the sake of beauty. In fact, this is a very wrong idea, which is the thinking mode of lighting electricians.
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