Low-voltage Dynamic Filtering Compensation Device
Short Description:
As the level of industrialization in our company improves, various industries are demanding higher quality from the power grid. At the same time, industrial automation heavily uses devices such as rectifiers, inverters, medium-frequency furnaces, and automatic welding equipment, generating a large number of harmonics, which distort the voltage and current waveforms in the system and degrade the power grid quality. The harm caused by harmonics has become a major public nuisance in the power grid. To filter harmonics in the power supply system, one of the methods is to use harmonic filtering and reactive power compensation devices.
Product details
Product Overview
With the improvement of our company's industrialization level, all walks of life have higher and higher requirements for the quality of power grids. At the same time, industrial automation uses a large number of rectifiers, frequency converters, intermediate frequency furnaces and automatic welding equipment to generate a large number of harmonics, which distorts the waveform of voltage and current in the system, causing the quality of the power grid to deteriorate, and the harm of harmonics has become the main public hazard of the power grid. In order to filter out harmonics on the power supply system, the use of harmonic filtering reactive power compensation device is one of the methods.
The power electronics technology and intelligent control technology applied by the company not only solve the problem of switching the compensation of shunt capacitors under harmonic conditions, but also suppress or control harmonics according to the actual situation and requirements of users, clean the power supply network and improve the power factor. Therefore, this product is a product with high technology and reliable technology in the field of low-voltage harmonic governance.
How it works
The important components of TSF low-voltage dynamic filtering and compensation device are: monitoring unit, switching module, filter capacitor, filter reactor, circuit breaker, control system and protection system, cabinet, etc.
The capacitance of the capacitor in the TSF low-voltage dynamic filtering and compensation device is determined based on: the reactive power required by the system to be compensated at the fundamental frequency; The selection of the inductance value in the LC loop is based on the fact that it can generate series resonance with the capacitor at the sub-harmonic frequency, so that the device forms a very low impedance (close to zero) at the sub-harmonic frequency, so that most of the harmonic current flows into the device instead of flowing to the power supply system, improving the harmonic voltage distortion rate of the power supply system, and at the same time installing parallel capacitors in the complete set of devices for rapid dynamic reactive power compensation, which can meet the needs of rapid load changes.
The TSF passive filter compensation device adopts single-tuning LC passive filter compensation technology, which is designed for the user's on-site harmonic conditions. The harmonics filtered by typical filter compensation devices are generally divided into: 3 times (150Hz), 5 times (250Hz), 7 times (350Hz), 11 times (550Hz), 13 times (650Hz), etc.
The connection between the TSF low-voltage dynamic filter and compensation device and the load is parallel.
Product application field
● Electric arc furnace (during the melting period, arc cut-off and circuit breaking phenomenon will occur, resulting in current imbalance of each phase, voltage flicker, low power factor, and 2~7 high harmonics, which seriously affects the power quality of the power grid);
● Traction substation powered by electric locomotive (6 pulsating or 12 pulsating rectifiers, generating 5, 7, 11, 13 high harmonics, variable loads can cause impact on the power grid at any time)
●Large elevators in ports and coal mines (strong impact load, fast load change, large change, current instantly increased to full load when lifting, and almost empty load the rest of the time.) and the rectifier that powers it is a typical harmonic source, which has an impact on the power grid);
● Electrolyzer (powered by rectifier transformer, working current is very large, rectifier will produce 5, 7, 11, 13 high harmonics, affect power quality);
● Wind and photovoltaic power generation (photovoltaic and wind power storage inverter and cluster grid-connected power supply, which require stable voltage, harmonic filtering, compensation function, etc.);
●Metallurgical industry/AC and DC rolling mills (rolling mills with AC speed regulating motors or DC motor transmission can cause voltage fluctuations in the power grid, and due to the presence of rectifiers, they also produce 5, 7, 11, 13, 23, 25 high harmonics, affecting the quality of power supply);
●Automobile production line (transmission devices, welding, painting and other devices are generally powered by 6 or 12 pulsation rectifiers, generating 5, 7, 11, 13, 23, 25 harmonics and causing power grid voltage fluctuations);
●Drilling platform (generally powered by 6 pulsating rectifiers, 5, 7, 11, 13th harmonics are more serious, which increases the current in the system, low work efficiency, and large generator input);
●High-frequency welding machine, electric (spot) welding machine, intermediate frequency furnace (typical rectifier and inverter device, and high-order harmonics generated by impact loads, which seriously affect the power quality of the power grid);
● Smart buildings, large shopping malls, office buildings (a large number of fluorescent lamps, projection lights, computers, elevators and other electrical equipment can cause serious distortion of voltage waveforms and affect power quality);
● National defense, aviation (high-quality power supply solution for sensitive loads of clusters);
●SFC system of dyeing turbine power station (a typical rectifier and inverter device, the number of high harmonics produced is 5, 7, 11, 13, 23, 25, etc., which seriously affects the power quality of the power grid.
Product features:
●Zero current switching: The high-power intercrystalline current cross-zero switching technology is used to achieve zero current input, zero current cutting, no inrush current, and no impact (vacuum AC contact is optional).
● Fast and dynamic response; Quickly track the reactive power change of the system load, and dynamically respond to switching in real time, and the system response time ≤ 20ms
● Intelligent management: take the real-time reactive power of the load as the physical quantity, apply the instantaneous reactive power control theory, and complete the data acquisition, calculation and control output within 10ms. In realizing instantaneous switching control, distribution parameters, power quality and other data, online monitoring and remote telemetry, remote signaling, remote adjustment can be realized.
●The device has a variety of protection functions, such as over-voltage and under-voltage protection, power failure protection, short circuit and over-current protection, temperature control protection, power failure protection, etc.
●Device display content: voltage, current, reactive power, active power, power factor and other 11 kinds of electrical parameters.
●The single-tuning compensation loop capacitor adopts the anti-harmonic capacitor Y connection method.
Technical performance
Rated voltage: 220V, 400V, 690V, 770V, 1140V
Fundamental Frequency: 50Hz, 60Hz:
Dynamic response time: ≤20ms.
harmonic measurement range; 1~50 times
Fundamental reactive power compensation: the power factor can reach more than 0.92-0.95.
The filtering effect meets the requirements of our company's standard GB/T14549-1993 "Harmonics of the power quality of the public grid".
The number of harmonics filtered: 3, 5, 7, 11, 13, 17, 19, 23, 25, etc.
voltage stability range; Meet the requirements of our company's standard GB12326-1990.
Harmonic current absorption: 70% on average for 5th harmonics and 75% for 7th harmonics.
Degree of protection: IP2X.
Use environmental conditions
The installation site is indoors, without violent vibration and shock.
Ambient temperature range: -25°C~+45°C,
At 250C, relative humidity: ≤95%.
Altitude: no more than 2000 meters.
There are no explosive and flammable media around, no gases that can damage the insulation and corrode metal, and no conductive dust.
