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The fast anti-harmonic intelligent power capacitor is designed for the power network with large harmonic content, rapid reactive power change, and the situation where 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-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, having no amplification effect on harmonics, and being able to absorb some harmonics.
The synchronous inspection relay is used in the automatic reclosing line of the two-end power supply system as an inspection element for voltage presence and synchronism. The grounding relay is an instantaneous overcurrent relay, used as the grounding zero-sequence overcurrent protection for high-voltage three-phase AC generators and motors in the low-current grounding power system. The single-loop intelligent measurement and control instrument uses a dedicated integrated chip. The measurement input and transmission output use digital correction and self-calibration technologies, with stable measurement, eliminating the measurement errors caused by temperature drift and time drift.
There are also some other situations. For example, if temperature and humidity need to be controlled, a constant temperature and humidity machine is required. Therefore, non-standard dehumidifiers are mainly used as dehumidifiers customized according to conditions in special environments. Their main functions still need to be customized according to the relative humidity, ambient temperature, and area space of use. Of course, this kind of machine is mainly produced to meet the needs, and the price will also fluctuate according to different conditions.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 theIntelligent Reactive 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, 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 6% or 12% filtering reactance in series in the capacitor circuit | Phase-separated compensation or hybrid compensation Composite switch zero-crossing switching Connect 6% or 12% non-tuned filtering reactance in series in the capacitor circuit | Three-phase common compensation Thyristor switch dynamic switching Connect 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 reactor 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 (a large number of harmonics exist) | Three-phase common compensation Zero-crossing switching of composite switch Tuned filtering circuit composed of capacitor or reactor | Phase-separated compensation or mixed compensation Zero-crossing switching of composite switch Tuned filtering circuit composed of capacitor or reactor | Three-phase common compensation Dynamic switching of thyristor switch Tuned filtering circuit composed of capacitor or reactor | Phase-separated compensation or mixed compensation Dynamic switching of thyristor switch Tuned filtering circuit composed of capacitor or reactor |
A system with the same macroscopic properties at all points is called a homogeneous system. A balanced system and a homogeneous system are two different systems. The thermal homogeneous system of a dehumidifier can be a balanced system, but a balanced system is not necessarily a homogeneous system. For a non - homogeneous system, an equilibrium state can also occur under certain conditions. When there is no heat transfer between the parts of the system, the thermal system of the dehumidifier is in thermal equilibrium; if there is no relative displacement between the parts of the system, the system is in mechanical equilibrium. The higher the resolution of the stepping motor (the number of steps per revolution, 360° divided by the step angle), the higher the position accuracy. To obtain high resolution, the number of poles in the design should be large. In the PM type, the N and S poles are alternately placed at equal pitches on the outer surface of the rotor core. The number of rotor poles is the sum of the number of N poles and S poles. For simplicity of explanation, assume the number of pole pairs is 1. Here, the step angle θs of the stepping motor with a permanent magnet rotor is expressed by the following formula, where Nr is the number of rotor pole pairs and P is the number of stator phases (for the HB type stepping motor described later in this lesson, Nr is the number of rotor teeth): θs = 180°/PNr The physical meaning of the above formula is as follows: The mechanical angle of the rotor for one full rotation is 360°.
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Multifunctional power meter EM600LED - I - NC Reactive power meter KDY - 1Q1X9
Motor protector PD28M - 100A - B - SLVMNS Current transformer Over - voltage protector AK - CTB - 9D
Line protection and measurement and control device HSA - 531 Ammeter CO
Reactor QD - OCL - 055 Switch status display instrument ZCK113 - AC
Sensor AP - AS/MCU/CTE/PSM Ammeter KDY - 2I1X9 Intelligent temperature and humidity controller KWS - 3420
Current transformer SD - 0.66 - 30I Intelligent capacitor TDS - 13SZ/450 - 20
Thyristor switch KID - TSC50 Digital display voltmeter XH394U - 9T1
Capacitor - reactor MJDTL - 30GD/7K Three - phase voltmeter PZ6804U - 9K4
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Small circuit breaker CCB1 - 63 Small circuit breaker CDYI - 4P
Dry - type transformer temperature controller BWD - 2KS01 Intelligent dynamic reactive power compensation device WMRC07 - 350/H
Pointer - type AC ammeter CP - T72N Single - phase digital display ammeter PA800H - A41/1M
Humidity controller AY - LM - 1(TH) Combined over - voltage protector ANHTB5D - 13.5/30.8 Capacitor LCP480 - 25
Current transmitter CA - 12 - A55 - A5 - A1 Microcomputer protection and measurement and control device BONN - 811S
Voltage transformer JDZX10 - 12 Capacitor - reactor KLD - BKT7 - 480/10 - 400V
Digital display ammeter AP3111I - 9T1 Three - phase digital display voltmeter TGW194U - 9X4
Intelligent capacitor - reactor compensation module KBR - M - 7E50/C
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