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Help CenterPrinciple of Wuhan Ym-bgb/250-20 Intelligent Capacitor
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The rapid 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, thyristor, reactor, and aluminum-shell low-voltage power capacitor. It has the characteristics of fast response speed, zero-crossing switching of capacitors, no inrush current impact, effectively extending the service life of capacitors, no amplification effect on harmonics, and the ability to absorb some harmonics.
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@Intelligent reactive power compensationcapacitoris an intelligent reactive power compensation device for the 0.4kV low-voltage distribution network to reduce line losses, improve power factor, improve power quality, and save energy. Based on the intelligentreactive power compensationcontrollerThe designed reactive power compensation scheme can refer to the following principles
| 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 the transformer capacity (mainly linear load) | Three-phase common compensation, zero-crossing switching of composite switches | Phase-separated compensation or hybrid compensation, Zero-crossing switching of composite switches; | Three-phase common compensation, dynamic switching of thyristor switches | Phase-separated compensation or hybrid 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 hybrid 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 hybrid compensation Dynamic switching of thyristor switches Connect 6% or 12% non-tuned filtering reactance in series in the capacitor circuit |
| Harmonic control target | Destroy the parallel resonance between the capacitor and the system, and partially absorb the 3rd, 5th, 7th and above 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. Zero-crossing switching of the composite switch. A tuned filtering circuit composed of capacitors or reactors. | Phase-separated compensation or hybrid compensation. Zero-crossing switching of the composite switch. A tuned filtering circuit composed of capacitors or reactors. | Three-phase common compensation. Dynamic switching of the thyristor switch. A tuned filtering circuit composed of capacitors or reactors. | Phase-separated compensation or hybrid compensation. Dynamic switching of the thyristor switch. A tuned filtering circuit composed of capacitors or reactors. |
It has the characteristics of both a travel switch and a micro switch, and at the same time has sensing performance. It has reliable operation, stable performance, fast frequency response, long service life, strong anti-interference ability, etc., and has the characteristics of waterproof, shockproof, and corrosion-resistant. The motor protection relay (hereinafter referred to as the protector) is suitable for the overload, blocking, phase loss, three-phase current imbalance, grounding, and PTC temperature protection of AC motors with a frequency of 50Hz, a rated insulation voltage of below 690V, and a rated working current of 1A~800A for long-term or intermittent operation. Many colleagues have asked me questions about reactive power compensation, including young friends who are new to the industry and old electricians, and there are quite a few people asking. I think it is necessary to discuss it with the masters. Question: What kind of current is the current on the ammeter of the capacitor compensation cabinet? Does this current do work? This current is the capacitor current, also called the reactive current. The reactive current does not do useful work. The reason for capacitor reactive power compensation is that in our electrical loads, many are inductive loads, such as motors, compressors, relays, etc. Inductive loads consume both useful work and useless work. Since the capacitor current leads the voltage by 90 degrees, while the inductive current lags the voltage by 90 degrees, it means that the capacitor compensation current is used to offset the inductive current, to improve the power factor, to increase the load capacity of the transformer, and to improve the power quality.
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