Supplier: Hvac system, heating ventilation air conditioning,central airconditioner equipment, air terminals, clean engineering products, ventilation units, power equipments, frp industrial fittings
Services: OEM
Overview This device is designed and manufactured for 35kV cable AC withstand voltage test. The reactor is individually designed for multiple units, which can not only meet the test conditions of high-voltage and low-current equipment, but also meet the low-voltage AC withstand voltage test requirements of 10kV cables. The special AC resonance test system for cables adopts the method of adjusting the frequency of the power supply, so that the reactor and the capacitor under test can achieve resonance, and the high voltage and large current can be obtained on the test product. It is a new method of current high voltage test and The trend has been widely used at home and abroad. The AC resonance test system uses a dedicated SPWM digital waveform generator chip with a frequency resolution of 16 bits, and the frequency fineness can reach 0.1 Hz at 20 to 300 Hz; it adopts an orthogonal non-synchronous fixed carrier modulation method to ensure that the entire frequency The output waveform is good in the interval; the advanced IPM module is used in the power part to ensure the stability and safety of the instrument under the minimum weight. The test system consists of a frequency and voltage regulation power supply, an excitation transformer, a reactor, and a capacitor divider. Technical index 1. the resonant excitation power supply only needs 1/Q of test capacity, which is 1/10-1/30 of common test unit and reduces the system weight and volume greatly. 2. Rated voltage: 1.108kV meeting the alternating current withstand voltage test for 35kV cable; 2.Waveform distortion rate of output voltage should be less than 1.0 3.The permissible continuous working time is to work for 5 minutes at one time under rated condition. 4.Quality factor of unit itself: Q 50 Advantage 1.The power capacity needed is reduced greatly. 2.The weight and volume of equipment is reduced greatly. 3.The waveform of output voltage is improved. 4.The large short-circuit current is prevented from burning fault point. Feature: 1. A large number of cables with voltage levels of 35kV and below are used, and the test workload is large, so this type of withstand voltage test device is small in size and light in weight, and a portable cable withstand voltage test system was born; 2. This system requires that the weight of the parts that a single person can move on-site does not exceed 30kg, and the weight of the parts that two people can move on-site does not exceed 60kg, which is suitable for on-site transportation; 3. The power supply adopts 220V single-phase power supply or 380V single-phase power supply, which is convenient for on-site power supply; 4. The reactor part is made of dry epoxy casting, which is beautiful and reliable, suitable for the requirements of various cables; 5. The withstand voltage test of 110kV and above cables adopts oil-immersed reactors.
Supplier: Hvac equipment and air cleansing devices
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Services: Buying office, oem, components sourcing, value added services
Buyer: In shell pecan nut, macadamia nut
Supplier: Power Generation, Rental Power And Hvac Equipment
170mv substation equipment International standard
High reliability: The SCR is installed in low voltage circuit, not in main circuit, so, the withstanding voltage is just 1% of main circuit voltage. Low harmonic contents: THD is below of 5%, which comply with related national criterion, if the multiple connections are adopted, the THD can be reduced below of 1.2%. Small dimension: the dimension of MCR is about 2/5 of TCR. It can be able to connect in high voltage power grid, the cost and floor space are reduced dramatically. Fast response time(100~300ms), it can fully meet the demand of dynamic reactive power compensation of power equipments. No need of cooling devices, which reduce the fault rate, maintenance cost and floor space. The advantage of MCR-typed SVC The MCR-typed SVC was based on traditional saturation reactor technology; it was put forward by Russia scientists. They introduced the concept of magnetic valve creatively to just make the small section of iron core saturation, which solved the high harmonic problems caused by traditional saturation reactor, because all iron cores in traditional saturation reactor are excessive saturation, then result in nonlinear harmonic. At the same time, the SVC of MCR type reduced the dimension, weight and noise of entire system; it has many advantages, such as: low harmonics, fast response time, high voltage withstanding level, stable operation, small floor space and long service life. Therefore, the SVC of MCR type is quickly spreading in Russia, Ukraine, America, India, China and other countries. It plays a very important role in improving power quality, decreasing reactive power loss, stabilizing power grid voltage and enhancing the reliability of power grid operation.Because MCR-typed SVC adopted advanced micro-electronics technology, it can regulate reactive power demand and compensation on bus bar accurately: The inductive reactive current in main circuit can be adjusted through changing low voltage DC to regulate main circuit impedance fast and smoothly, meanwhile, through cooperating with capacitor bank paralleled in bus bar, reactive power compensation demand can be realized on bus bar, and dynamic response and improved power factor can stabilize bus bar voltage. Choosing reactor parameters properly connected in series with capacitor bank, the compensation on fundamental wave can be obtained, and the harmonic also can be filtered. Because the SVC of MCR is free of frequent switching from mechanical parts, then it avoids surge and over-voltage impact caused by MSC, which enhances the reliability and the service life of the equipment, as well, protects the other instruments. The SVC of MCR type fully absorbed advantages and functions of TCR-typed SVC by comparison; it solved the problems of smooth regulation which can not be realized by MSC and TSC, and also overcome some disadvantages of TCR-typed SVC. Because the reactor is connected to high voltage main circuit directly in series, it must stand extra high voltage and ultra high voltage. At present, the highest voltage of reactor in our country reach to 1000KV, and the maximum capacity reach to 320MVar. The reactor also has over-load function; it will not generate big damage to system except heating, while, the thyristors in TCR-typed SVC is connected to high voltage circuit directly, the over-voltage will result in faults and break. So it is very stable for MCR-typed SVC to operate under the high voltage circuit with free of maintenance. Wooden case (Fumigation).
Principle APF is a new power electronic equipment which can dynamically filter harmonic with variable amplitude and frequency and compensate reactive power, it overcome the shortages of traditional LC filter and obtained the better compensation characteristics than passive filter. The following diagram is schematic diagram of APF, where, Vs is AC power supply, nonlinear load is harmonic source, it generates harmonic and consumes reactive power. APF is composed of instruction current operational circuit and compensation current generation circuit, the instruction current operational circuit is mainly to inspect current contents in harmonic current and reactive power of compensation object, and the compensation current generation circuit generates actual compensation current according to instruction current, the main circuit adopted PWM converter. Technical Features: Compensate any order harmonic with variable amplitude and frequency and different reactive power dynamically, and has a high-speed response time to the change of compensation object, it is hard to generate harmonic resonance with power grid impedance. It can implement compensation on single harmonic source and reactive power source and also implement centralized compensation on many harmonic and reactive power sources. Adopt full-bridge PWM converter to generate compensation current, the power unit is 5th generation IGBT, it is working under the high-frequency switching. Power circuit and control circuit adopted modularized structure or plug-in unit, same module can be replaced, which enhanced the reliability and maintenance. DSP high-speed checking and operation ensure harmonic checking and compensation control correct; It has intelligent supervisory control function, the working state and operation parameters are displayed in real-time, meanwhile, faults can be self-diagnosed; it also has remote communication interfaces, the real-time monitoring can be realized through PC. With perfect protection functions, the main circuit adopted three-phase three wire or three-phase four wire, it is designed to shunt APF, very easy and safe to operate. The master chip adopted latest floating-point DSP F28335 of TI Company and FPGA of ALTERA Company to make the system have powerful processing capacity, the sampling adopted AD7606 with 16 bits of AD Company to ensure control precision. APF can be used in power grid alone or can be combined with other passive filters together to realize hybrid filter with best ratio of performance to price. Application Fields: Static converters for industrial use, such as high and low voltage transducer (speed regulation), high capacity rectifier devices, etc. The DC equipment or transducer of the steel mill, high speed wire, boards and bars. Ferrous (non-ferrous) rolling (mill): Such as stainless steel rolling, carbon steel rolling, line rolling, aluminum sheet (strip, foil) rolling mill. Non-ferrous electrolysis industry: Electrolytic aluminum, copper, cadmium, cesium, etc. Rubber and plastic industry: Internal mixer, injection molding machine, extruding machine, blow molding machine etc Medium frequency induction heating furnace: Metal casting industry, steel mill hot rolling. Electrolysis of chemical plant: Electrolysis NaCl, electrolysis KCl, electrolysis H, et. Electroplating industry: Chroming, aluminizing and galvanizing in lighting factory, etc. Paper industry: Speed regulation used for craft, such as paper-pulp squeezer, etc Petrochemistry: During the technological process of chemical and oil refining, large amount of low voltage inverters used for speed regulation, and small amount of high voltage and high power electronic circuit equipments for starting, etc. DC traction equipment: Electrical railway, light rail vehicle, mine traction locomotive etc. Other high capacity industrial DC power supply. 2. AC/DC Arc Equipments AC/DC arc furnaces: Such as the Electric Arc Furnace in steel mill, etc. AC/DC arc welding machine: Automobile manufacturing, ship building, heavy machinery manufacturing, etc. 3. Power supply devices for special use High capacity uninterruptible power supply, communication power supply, high (low) frequency power supply, etc. Such as bank, hospital, semiconductor factory, program control exchange plant, remote communications, data communication station, substation, military installations, office buildings etc 4. Starting of the high capacity electromotor and switching of the high capacity reactive compensation. 5. High-precision automatic production line: The production line itself does not produce harmonic, but it is very sensitive to harmonic, so the active power filter should be installed at the side of power supply to reduce harmonic interference for production line. Wooden case (Fumigation).
1, Dmx512 decoder module. 2, 12v, 2a per loop. 3, can work with 12v led strip/led module/led bulb.
