Overview
Power quality refers to the quality of alternating current supplied to end users through the public grid. Simply put, it describes the condition of electrical energy within grid lines. Power quality issues primarily originate from the load side. For instance, impactive reactive loads can cause severe voltage fluctuations in the grid, degrading power supply quality.
The advancement of power electronics technology has brought positive aspects to modern industry, such as energy conservation and efficient power conversion. However, the widespread application of power electronic devices across various industries has also introduced new and more severe damage to power quality, making them a primary source of harmonic pollution in the grid.
The increasing use of rectifiers, variable frequency drives, arc furnaces, electrified railways, and various power electronic equipment in the distribution networks of end-users within the grid system has caused impacts on the power network, or what is termed power pollution. This manifests as voltage instability, overvoltage, and harmonic generation. Harmonics reduce the efficiency of power generation, transmission, and utilization, causing electrical equipment to overheat, vibrate, and generate noise. They accelerate insulation aging, shorten equipment lifespan, and may even lead to failures or burnouts. Harmonics can also trigger local parallel or series resonance in power systems, amplifying harmonic content and potentially destroying equipment like capacitors.
The nonlinear, impact-prone, and unbalanced power consumption characteristics of these loads severely degrade power supply quality. Therefore, eliminating high-order harmonics in power supply and distribution systems is crucial for improving power quality and ensuring the safe, stable, and economical operation of power systems.
Concurrently, modern industrial, commercial, and residential electrical equipment has become increasingly sensitive to power quality, demanding higher standards for power supply. Currently, harmonics, electromagnetic interference, and reduced power factor are collectively recognized as the three major hazards in power systems.
When grid power quality is disrupted or degraded below national standards, targeted improvements must be implemented. To understand actual grid power quality conditions, corresponding testing and analysis equipment is essential.
1. This instrument is a high-precision testing device specifically designed to detect power quality issues in power grids, including waveform distortion, harmonic content, voltage fluctuations and flicker, and three-phase imbalance. It also features electrical parameter measurement and vector analysis capabilities.
2. It accurately measures multiple electrical parameters including voltage, current, active power, reactive power, phase angle, power factor, and frequency.
3. It displays vector diagrams of measured voltage and current, enabling users to verify the correctness of metering equipment wiring through vector analysis.
4. Current measurement supports both clamp-on current transformers and direct wiring. When using clamp-on CTs, operators can perform measurements conveniently and safely without interrupting the current circuit. For higher precision measurements, direct wiring ensures maximum accuracy of test data.
5. Measures and analyzes AC power quality from utility grid to user end, including: frequency deviation, voltage deviation, voltage fluctuation, flicker, permissible three-phase voltage imbalance, and grid harmonics.
6. Displays single-phase voltage/current waveforms and simultaneously shows three-phase voltage/current waveforms.
7. All test interfaces feature screen lock functionality for convenient reading and data analysis.
8. Load fluctuation monitoring: Measures and analyzes fluctuations in utility grid power quality caused by various electrical equipment under different operating conditions. Periodically records and stores trends in electrical parameters including voltage, current, active power, reactive power, apparent power, frequency, and phase.
9. Dynamic monitoring during power equipment adjustment and operation to assist users in resolving issues encountered during equipment commissioning and operation.
10. Capable of testing and analyzing dynamic parameters of reactive power compensation and filtering devices within power systems, providing quantitative evaluations of their functionality and technical specifications.
11. Supports configurable storage intervals for continuous data logging at preset time intervals.
12. Features a built-in high-capacity data storage unit capable of continuous logging at 1-minute intervals for over 18 months, meeting long-term monitoring requirements at test sites.
13. Equipped with a USB interface for convenient direct data transfer to backend management computers.
14. Integrates with powerful data management software to upload real-time sampling data directly to backend systems for comprehensive and rapid processing.
15. Features a perpetual calendar and clock function, displaying real-time date and time. It can save test data and results during on-site detection, upload them to a computer via serial port, and achieve computerized data management through backend management software (optional accessory) with powerful reporting capabilities.
16. Utilizes a large-screen imported color LCD as the display, featuring an English operating interface with English prompt messages and a multi-parameter LCD display interface, providing a user-friendly human-machine dialogue interface.
17. LCD display automatically turns off after 3 minutes of inactivity to maximize battery life.
18. Conductive silicone rubber buttons provide excellent tactile feedback, long service life, rational design, and convenient operation.
19. Built-in high-capacity, high-performance lithium-ion rechargeable battery enables over 10 hours of continuous operation on a full charge.
20. Compact size and lightweight design ensure portability, suitable for both field measurements and as standard laboratory measurement equipment.
1. Input Specifications
Voltage measurement range: 0–800V, auto-ranging.
Current measurement range:
Clamp-on current transformers (three types):
5A/25A (standard)
100A/500A (optional)
400A/2000A (optional)
Phase angle measurement range: 0–359.99°.
Frequency measurement range: 45~55Hz.
Number of voltage channels: Three channels (UA, UB, UC).
Number of current channels: Three channels (IA, IB, IC).
Maximum harmonic analysis order: 63rd.
Maximum continuous storage period at 1-minute intervals: 18 months.
2. Accuracy
Electrical parameter measurement section:
Voltage: ±0.1%
Frequency: ±0.01Hz
Current, Power: ±0.5%
Phase: ±0.2°
Power Quality Section:
Fundamental voltage tolerance: ≤0.5% F.S.
Fundamental current tolerance: ≤1% F.S.
Measurement error of phase difference between fundamental voltage and current: ≤0.2°
Harmonic voltage content measurement error: ≤0.1%
Harmonic current content measurement error: ≤0.2%
Three-phase voltage unbalance error: ≤0.2%
Voltage deviation error: ≤0.2%
Voltage fluctuation error: ≤0.2%
3. Operating Temperature: -10°C to +40°C
4. Charging Power Supply: AC 220V, Frequency 45Hz-55Hz
5. Main Unit Power Consumption: ≤3VA
6. Maximum battery operating time: ≤10 hours
7. Insulation:
(1) Insulation resistance between voltage/current input terminals and chassis: ≤100MΩ.
(2) Withstands 1.5KV (RMS) power frequency voltage between input terminals and chassis for 1 minute.
8. Dimensions: 320mm × 240mm × 130mm
9. Weight: 2.0 Kg
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Engineers provide guidance for installation and commissioning
Technicians can provide on-site maintenance services and receive regular training
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