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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, thyristor, reactor, and aluminum shell low-voltage power capacitor. It has the characteristics of fast response speed, zero-crossing switching of the capacitor, no inrush current impact, effectively extending the service life of the capacitor, no amplification effect on harmonics, and can absorb part of the harmonics.
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Current transformers are mainly used indoors for AC circuits with a rated voltage of 0.5kV and below and a rated frequency of 50Hz for current and electric energy measurement or relay protection. The product is a dry-type current transformer and is installed by fixing the base plate. Current transformers are mainly used outdoors for AC circuits with a rated voltage of 0.5kV and below and a rated frequency of 50Hz for current and electric energy measurement or relay protection. The product is a cast-type current transformer, and the middle window allows the primary busbar to pass through.Intelligent Reactive Power CompensationCapacitoris an intelligent reactive power compensation device for reducing line losses, improving the power factor, improving the power quality, and saving energy and reducing consumption in the 0.4kV low-voltage distribution network. 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 loads | Three-phase unbalanced frequently changing loads | |
| Non-linear equipment in the load ≤ 15% of transformer capacity (mainly linear loads) | Three-phase common compensation, composite switch zero-crossing switching | Phase-separated compensation or hybrid compensation Composite switch zero-crossing switching; | Three-phase common compensation, thyristor switch dynamic switching | Phase-separated compensation or hybrid compensation Thyristor switch dynamic switching; |
| 15% | Three-phase common compensation Composite switch zero-crossing switching Connect a 6% or 12% filtering reactance in series in the capacitor circuit | Phase-separated compensation or hybrid compensation Composite switch zero-crossing switching Connect a 6% or 12% non-tuned filtering reactance in series in the capacitor circuit | Three-phase common compensation Thyristor switch dynamic switching Connect a 6% or 12% non-tuned filtering reactance in series in the capacitor circuit | Phase-separated compensation or hybrid compensation Thyristor switch dynamic switching Connect a 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 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 Zero-crossing switching of composite switch Tuned filter circuit composed of capacitors or reactors | Phase-separated compensation or mixed compensation Zero-crossing switching of composite switch Tuned filter circuit composed of capacitors or reactors | Three-phase common compensation Dynamic switching of thyristor switch Tuned filter circuit composed of capacitors or reactors | Phase-separated compensation or mixed compensation Dynamic switching of thyristor switch Tuned filter circuit composed of capacitors or reactors |
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