Power quality refers to the quality of the AC power supply via the utility grid to the user, which normally means the good or bad situation of the electric energy in transmission line. Power quality problems are mainly caused by the load side of the terminal. For example, impact reactive load will lead to serious fluctuates to power network voltage, and decrease the quality of power supply.
With the development of power electronics technology, on one hand, it brought positive side to the modern industrial energy efficiency and energy conversion. On the other hand, while the power electronic devices are widely used in all walks of life, it also has brought new and more serious damage to the power quality, and has become the main source of harmonic in grid.
The increasing use of rectifiers, frequency control devices, electric arc furnaces, electric railway and a variety of power electronic devices in each distribution system, impact the electricity network or called power pollution. It causes voltage instability, over-voltage, generates harmonics and so on. Harmonic makes efficiency of electricity production, transmission and utilization reduce, so that the electrical equipment will be overheat, vibration and making noise, and insulation aging, shortened life expectancy, and even failure or burned. Harmonics can also cause localized power system an occurrence or series resonant parallel resonance, so that the harmonic content is amplified, resulting in capacitors and other equipment destroyed.
Electrical properties of non-linear, impact resistance and unbalanced of these kind of load, causes serious pollution to the quality of power supply. Thus, eliminating the higher harmonic problem in supply and distribution system has a very positive meaning in improving the power quality issues and ensuring power system security, stability and economic operation.
On the other hand, electrical equipments in modern industrial, commercial and residential users are more sensitive to power quality, and have a higher requirement of quality of power supply. Currently, harmonics, electromagnetic interference, power factor reduction have been tied to the three hazard of the power system.
When it is interfered or contaminated, grid power quality can’t reach the national standards, so it has to be targeted on the grid power quality improvement. To understand the actual situation of power quality, you must have the appropriate equipment to test and analysis the actual situation. Counter the domestic condition, our company developed the professional power quality analysis instrument, which is suitable for the country.
II.Functions and Features
1. Multi-channel testing: Simultaneous measurement of 4 voltage channels and 4 current channels.
2. Electrical parameter measurement: It can measure a variety of electrical parameters at the same time, such as voltage, current, active power, reactive power, phase angle, power factor, frequency, etc.
3. It can measure the voltage harmonic and 2-64th current harmonic content
4. It can measure the 0.5-31.5 Inter-harmonic content of voltage and current
5. It can measure the total harmonic distortion rate of voltage and current
6. Can measure and short-term flicker (Pst), long-term flicker (Plt), voltage fluctuation
7. It can measure positive sequence voltage, negative sequence voltage, zero sequence voltage, voltage unbalance
8. It can measure positive sequence current, negative sequence current, zero sequence current, current unbalance
9. It has the function of measuring transient parameters and the function of recording voltage swells and drops. At the same time, the recording function is automatically started to record the occurrence time of the event and the actual waveforms of the five cycles before and after the occurrence.
10. It has an oscilloscope function, which can display the size and distortion of voltage and current in real-time waveforms, and can zoom in and out of the voltage and current waveforms on the instrument
11. It has a hexagonal diagram display function, which can perform vector analysis of the metering circuit and the protection device circuit, and check the wrong wiring of the metering device; in the three-phase three-wire connection mode, it can automatically judge 48 wiring methods; the automatic calculation function of the supplementary power is convenient to use. The personnel calculate the supplementary power for users with wiring problems.
12. Optional large clamp can be used to measure the transformation ratio and angle difference of low-voltage current transformers
13. Harmonic content can be displayed in the form of a histogram, with good visual effects
14. It has built-in large-capacity data memory, (storage interval 1 second-1000 minutes optional) can store data continuously for more than 18 months at a time interval of 1 minute
15. 10-inch large-screen color LCD monitor 1280×800
16. Capacitive screen touch operation is similar to that of tablet PC and smart phone, easy to learn
17. Support mouse operation, adapt to operators with different habits
18. During harmonic measurement, it can automatically judge whether the harmonic content of each order exceeds the standard according to the national standard and give a prompt, which is clear at a glance
19. It has a national standard query function for harmonic content rate, which can query the allowable value of the national standard
20. It has a frequency measurement range of 42.5Hz-69Hz, capable of measuring 50, 60 power systems
21. Data can be stored in U disk for historical query.
22. It can be equipped with dedicated data analysis and management software to analyze and process the test results, and can grasp the power quality and load periodic changes of the measured point. This is irreplaceable for the power workers to understand the user's power quality and take corresponding processing measures effect
23. The analysis software can generate professional power quality analysis reports in accordance with the requirements of the national standard
24. The instrument has a screen capture function, and the displayed data on any screen can be manually saved in the form of pictures
25. The instrument is small in size, light in weight and easy to carry
26. It has a built-in high-performance lithium-ion battery and automatically enters the power-saving mode, allowing the instrument to work continuously for more than 10 hours without an external power supply, which is convenient for on-site testing
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