Mi550 Handheld Three-Phase Power Quality Analyzer - Complete Specifications

I. Basic Product Information
Model: Mi550
Type: Handheld Three-Phase Power Quality Analyzer
Application Areas: Power Analysis, Power Measurement, Power Quality Analysis
Connection Method: External Rogowski coil / Voltage-type CT, enabling wire-free testing
Supported Wiring Systems: Three-phase four-wire 4CT, Three-phase four-wire 3CT, Three-phase three-wire 3CT, Three-phase three-wire 2CT, One-phase three-wire, Single-phase
Compatible Sensors: Rogowski coil, Voltage-output type current clamp (compatible with ST08, TRC, NRC series)
Voltage Connection: Direct connection / Connection via voltage transformer

II. Real-Time Measurement Parameters
Table: Measurement Category | Measurable Items
Voltage: Phase voltage (ABC phases, N phase to ground), Line voltage (UAB/UBC/UCA), Peak voltage, Peak voltage coefficient
Current: Phase current (ABCN phases), Peak current coefficient, K coefficient (ABC phases)
Frequency: Line frequency
Power Active / Reactive / Apparent Power (A, B, C phases and total power)
Power Factor: A, B, C phases and total power factor, fundamental power factor
Electrical Energy: Forward / Reverse active energy, forward / Reverse reactive energy, apparent energy
Harmonics: Voltage / Current total harmonics, odd / even total harmonics, 1st-50th harmonics
Unbalance: Voltage unbalance (negative sequence, zero sequence), current unbalance (negative sequence, zero sequence)
Angle: Phase voltage / phase current phase angle, voltage / current angle
Demand: Current, active / reactive / apparent power demand and maximum demand

III. Measurement Accuracy
Table: Parameter Measurement Range Accuracy Index
Voltage 0-600VAC 0.2%
Current 0-420mVAC (varies with sensor) 0.2% + Current sensor accuracy
Frequency 45-65Hz ±0.001Hz
Power Factor -1~+1 ±0.005 Active Power — 0.5% Reactive Power — 1% Apparent Power — 0.5% Active Energy — 0.5% Reactive Energy — 1% Apparent Energy — 0.5%

IV. Data Recording and Storage
1. Recording Types
Basic Data Recording: Full parameters including voltage, current, power, energy, harmonics, imbalance, angle, demand, etc.
Waveform Recording: ABC phase voltage/current waveforms, sampling rate and duration can be customized.
Harmonic Recording: Voltage/current harmonics 1-50, THD/TOHD/TEHD
Event Recording: Event type, start and end time, amplitude (recorded synchronously when data recording is enabled)
2. Storage Configuration
Storage Media: 32GB TF card
Data Format: CSV
Data Export: Export via USB flash drive (FAT32 format)
Recording Control: Name, start time, duration, and recording interval can all be set.

V. Communication and Hardware Parameters
1. Communication
Interface: RJ45 1. Ethernet Port
Protocol: Modbus-TCP, compatible with configuration systems, real-time data upload
2. Power Supply
Adapter: 5VDC, 2A
Battery: 2 x rechargeable lithium batteries, total capacity 4000mAh
Battery life: ≥6 hours on battery only
Charging time: ≤5 hours off
Power saving mode: Adjustable backlight brightness and automatic screen-off time
3. Display
Screen: 3.97-inch IPS screen
Resolution: 480×800
4. Mechanical and Environmental Specifications
Dimensions: 215×130×60mm
Weight: 850g
Operating environment: -20℃~+55℃, ≤90% RH
Storage environment: -40℃~+70℃, ≤95% RH (non-condensing)
Altitude: ≤2km
Measurement category: CAT III 600V
Protection rating: IP30
5. Appearance and Structure
Portable design: Side wrist strap, back tilt stand
Interface layout: Voltage / Current measurement terminals, Ethernet port, DC charging port, USB flash drive port
Battery compartment: Battery can be replaced by opening the back panel

VI. Comparison with MQ31 Analyzer
Table Item Mi550 (Handheld) MQ31 (Portable Box-type)
Positioning Portable handheld, rapid on-site testing Box-type protection, long-term online monitoring
Weight 850g Approx. 5kg
Protection Rating IP30 Whole unit protection, sensor up to IP68
Current Range Dependent on external sensor 0.5A~7200A Full coverage
Power Supply Built-in lithium battery, 6h battery life Main circuit power supply 90-528VAC
Applicable Scenarios Inspection, rapid measurement Substation, long-term outdoor monitoring