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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 low-voltage aluminum-shell power capacitor. It has the characteristics of fast response, zero-crossing switching of the capacitor, no inrush current impact, effectively extending the service life of the capacitor, no amplification effect on harmonics, and the ability to absorb some harmonics.
Since the cabinet is equipped with the control devices for the power supply bus and distribution outgoing lines, the primary task of the air cabinet dehumidifier is to continuously monitor the air humidity in the cabinet and ensure that the air temperature and humidity within each period are below the standard values. Only in this way can the operational safety be ensured to the greatest extent.
The penetration rate of dehumidifiers in foreign households is much higher. In contrast, the gap in the household penetration rate of dehumidifiers between foreign and domestic markets is quite large. The main reasons are as follows: Foreign household users started using dehumidifier products earlier and are more familiar with product knowledge. Foreign household users generally consider dehumidifiers as household...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, enhance 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 frequently changing load | |
| Non-linear equipment in the load ≤ 15% of transformer capacity (mainly linear load) | Three-phase common compensation, zero-crossing switching of composite switch, | Phase-separated compensation or hybrid compensation, Zero-crossing switching of composite switch; | Three-phase common compensation, dynamic switching of thyristor switch | Phase-separated compensation or hybrid compensation, Dynamic switching of thyristor switch; |
| 15% | Three-phase common compensation Zero-crossing switching of composite switch Connect 6% or 12% filtering reactance in series in the capacitor circuit | Phase-separated compensation or hybrid compensation Zero-crossing switching of composite switch Connect 6% or 12% non-tuned filtering reactance in series in the capacitor circuit | Three-phase common compensation Dynamic switching of thyristor switch Connect 6% or 12% non-tuned filtering reactance in series in the capacitor circuit | Phase-separated compensation or hybrid compensation Dynamic switching of thyristor switch 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 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 |
The low-voltage power distribution system is composed of iTAC switch components, cabinets, and display units. The feeder switch components include feeder switches (fixed switches), current sensors, monitoring units, indicator lights, and standard plastic or metal parts. The switch components achieve standardized production and testing, and the internal switches, indicator lights, monitoring units, etc. can be replaced online. Like the periodic I/O method, the global I/O method also occupies the I/O area of the PLC, so it is only suitable for communication of a small amount of data. Master-slave bus communication method The master-slave bus communication method is also called the 1:N communication method, which means that there are N stations on the PLC subnet with a bus structure, among which there is only 1 master station and the others are all slave stations. The 1:N communication method uses the centralized access control technology to allocate the bus usage right, usually using the polling table method. The so-called polling table is a list of slave station numbers arranged in order. This table is configured in the master station. The master station inquires the slave stations according to the arrangement order of the polling table to see if they need to use the bus, so as to achieve the purpose of allocating the bus usage right.
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