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ProductsHisrec focuses on power quality governance solutions
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Application CasesWidely used in power grid, new energy, automobile manufacturing, municipal engineering, data center, biopharmaceutical, medical and health and other fields
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About HisrecShenzhen Hisrec Electric Technology Co., Ltd. is a national high-tech enterprise and specialized new enterprise with employee stock ownership integrating R & D, production, sales and service.
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Contact UsHisrec adheres to the corporate mission of taking customers as the center, achieving the value of strivers and continuously returning to society.
2022/07/18
Main Indicators of Steady-state Power Quality
The main indicators of steady-state power quality: 1. Power supply voltage bias: the bias of the power supply voltage to the nominal voltage. 2. Frequency bias: the difference between the practical value and the nominal value of the grid frequency. 3, three-phase imbalance: voltage or current negative sequence weight and positive sequence weight of the square root value percentage. 4, harmonic: the periodic sexual flow stop Fourier series synthesis, get the frequency of the fundamental frequency is greater than 1 integer times the weight. 5. Voltage flicker: visual sense formed by unstable illumination of light. 6. Voltage sag (voltage sag). 7. Voltage surge (voltage swell). 8. Short-term infix of voltage.
2022/07/26
Active filter has the following advantages
C. selection only need to consider the size of the harmonic current, and has nothing to do with the load type. D. can be a single nonlinear load, concentrated nonlinear load, transformer power supply system to stop compensation, the device position is sensitive and diverse. E. internal maintenance is safe and reliable, not due to harmonic overload and exit operation, easy to expand. f. It is not affected by the system impedance and will not resonate.
2022/07/28
Where is the active filter installed?
Where is the installation location of the active filter device: When designing the installation of the active filter, the appropriate device location is selected according to the different requirements of the theater power distribution system and load conditions. There are three options for the location of the device under normal conditions: 1. The centralized management method can complete the filtering of all low-voltage nonlinear loads. Suitable for non-linear load is more dispersed, a single load capacity of small places. The filter is installed in the low-voltage distribution room. 2. In the grouping management mode, the active power filter device is installed in the second-level low-voltage distribution board, which is suitable for the place where the non-linear load is relatively concentrated. 3. The local management method is suitable for a single nonlinear load that produces large harmonic distortion and is relatively scattered, and the active power filter device is on the nonlinear load side. The closer the device of the active filter is to the harmonic source, the better the filtering effect is, which is the best way to reduce the harmonic current and wave voltage distortion. Due to the sensitivity of the position of the active power filter device, the best harmonic management effect can be achieved according to the design requirements.
2022/08/01
Definition of reactive power and active power
Definition of reactive power and active power: 1. apparent power: in AC circuit, the product of voltage effective value and current effective value in sinusoidal AC circuit is called apparent power. It only indicates the * large power that the circuit may provide or the * large active power that the circuit may consume. It does not represent the power consumed by AC circuit practice. 2. Active power: The power consumed by a pure resistance circuit is active power, and its voltage and current are in phase.
2022/08/03
Characteristics of reactive power compensation capacitor
Characteristics of reactive power compensation capacitor: ① Reactive power compensation capacitor is a capacitive reactive power supply source that operates for a long time under power frequency AC voltage. The reactive power compensation capacitor's own active power loss is small, accounting for about 0.3~0.5 of the ordinary reactive capacity. The power capacitor device is simple, easy to use, maintenance workload is small, a less investment. ④ Due to the structural characteristics, high ambient temperature and operating voltage will affect its applicable performance and life, and even form an accident. ⑤ The reactive power of the capacitor is proportional to the square of the voltage. When the system voltage decreases and more reactive power compensation is required, the reactive power of the power capacitor is reduced at this time, showing the lack of performance. Power capacitor is the power system reactive power compensation of the wrist, the operation of the parallel capacitor capacitive current offset rational current, so that the transmission components such as transformers, lines in the reactive power response is reduced, therefore, not only reduces the reactive power flow caused by the active loss, but also reduces the voltage loss, improve the power factor. So the use of parallel capacitors to stop the reactive power compensation at all levels of the power grid is the most common application of the power system.
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