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The fast harmonic-resistant 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 power capacitor with an aluminum shell. It has the characteristics of fast response speed, zero-crossing switching of capacitors, no inrush current impact, effectively prolonging the service life of capacitors, no amplification effect on harmonics, and the ability to absorb some harmonics.
It can replace a variety of meters, relays, transmitters, and other components. The comprehensive power monitoring meter can be installed at different positions in the power distribution system. The intelligent AC comprehensive power meter is an intelligent instrument for measuring comprehensive parameters of AC power. This product can simultaneously measure the voltage and current of each phase in the three-phase AC circuit, the combined active power, combined reactive power, combined power factor, combined frequency, total active electricity, total reactive electricity, and other parameters.
We know that the joint part of the capillary tube and the evaporator belongs to the connection of a small tube to a large tube. When the refrigerant in the dehumidifier leaves the capillary opening, the volume will expand, resulting in a pressure drop. At this time, the working components in the dehumidifier absorb heat through evaporation, and the moisture in it is frozen and condensed into ice, quickly blocking the opening.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 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 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 Series 6% or 12% filtering reactance in the capacitor circuit | Phase-separated compensation or hybrid compensation Zero-crossing switching of composite switches Series 6% or 12% non-tuned filtering reactance in the capacitor circuit | Three-phase common compensation Dynamic switching of thyristor switches Series 6% or 12% non-tuned filtering reactance in the capacitor circuit | Phase-separated compensation or hybrid compensation Dynamic switching of thyristor switches Series 6% or 12% non-tuned filtering reactance 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 above harmonics in the system | 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 above harmonics in the system | Destroy the parallel resonance between the capacitor and the system, and partially absorb the 3rd, 5th, 7th and above harmonics in the system |
| The ratio of non-linear equipment in the load > 50% of the transformer capacity (a large number of harmonics exist) | Three-phase common compensation Zero-crossing switching of composite switch Tuned filter circuit composed of capacitor or reactor | Phase-separated compensation or mixed compensation Zero-crossing switching of composite switch Tuned filter circuit composed of capacitor or reactor | Three-phase common compensation Dynamic switching of thyristor switch Tuned filter circuit composed of capacitor or reactor | Phase-separated compensation or mixed compensation Dynamic switching of thyristor switch Tuned filter circuit composed of capacitor or reactor |
The cost of each detection by a third-party testing agency is about 500 yuan. "Since residents need to pay the detection fee in advance, they will be very cautious when applying for detection. Not many residents apply for detection in a heating season, only dozens of households." Mr. Zhang believes that third-party temperature measurement provides a solution channel for heating, which used to be a matter of "each side insisting on its own view". This article mainly focuses on the PID self-tuning function and the debugging panel in the s7-200SMART plc. PID self-tuning instructions: The new S7-200SMART CPU supports the PID self-tuning function, and the PID adjustment control panel has also been added to the STEP7-Micro/WIN SMART programming software. Users can use the user program or the PID adjustment control panel to start the self-tuning function. At most 8 PID loops can perform self-tuning simultaneously at the same time. The PID adjustment control panel can also be used to manually debug the PID control loops of older versions of CPUs (which do not support PID self-tuning).
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