Intelligent Three-phase Vector Volt-ampere Meter

MOEORW-W6500 intelligent three-phase vector volt-ampere meter is a handheld testing instrument independently developed for power industry on-site verification, designed to solve hidden risks caused by incorrect wiring of transformer differential protection and high-voltage metering devices.

The equipment adopts DSP AC synchronous sampling architecture, supporting synchronous acquisition of 3 voltage channels and 3 current channels, with six-channel vector graphics displayed on one screen. It integrates phase calibration, electrical parameter measurement, metering wiring inspection, harmonic analysis, waveform observation and vector diagram drawing functions. The handheld housing is made of high-strength engineering plastic, equipped with a built-in large-capacity lithium battery, and supports offline field testing without external power supply.

It can accurately identify 48 types of miswiring of three-phase three-wire metering loops, draw complete hexagonal vector diagrams for complex differential protection via double-clamp measurement, analyze 2–21 times harmonic distortion of voltage and current, and store over 1,000 groups of test data for computer data upload and secondary analysis. The device is widely applicable to power substation acceptance, relay protection debugging, electric energy metering error inspection and power quality detection.

Input & Measurement Range

Measurement Accuracy

Environmental & Mechanical Parameters

Hardware & Structural Design
1.DSP high-speed AC sampling chip realizes synchronous collection of six analog signals, ensuring synchronous display of three-phase voltage and three-phase current vector diagrams.
2.High-brightness wide-temperature color LCD with full Chinese graphical menu, adjustable screen brightness, and silicone physical key panel with 30 operation keys for shortcut operation.
3.Integrated high-capacity built-in lithium battery with independent charging interface, supporting 8-hour continuous field measurement.
4.Three external expansion interfaces: RS232 serial communication port, dedicated charging port, USB data storage port, supporting data export and program upgrade.
5.Portable integrated molding shell with impact-resistant engineering plastic, compact size and light weight for outdoor live-line testing.
 

Core Measurement Performance
1.Double-clamp vector test function: Fixed A-phase current clamp, mobile auxiliary clamp to measure five groups of high/low side currents of transformer, automatically generate complete differential protection hexagonal vector diagram, and provide standard comparison vector diagram to judge wiring correctness.
2.Secondary electrical parameter measurement: Real-time display of three-phase voltage, three-phase current, phase angle distribution, vector diagram, and automatically select UA or Ia as phase reference benchmark according to signal access status.
3.Primary conversion parameter calculation: Automatically convert primary voltage, current, active/reactive/apparent power and power factor based on PT and CT transformation ratio preset by users, realizing direct reading of high-voltage side load data.
4.Three-phase three-wire metering wiring diagnosis: Automatically identify 48 types of standard and miswiring modes, judge phase sequence, current polarity error, and output metering correction coefficient for anti-electricity theft inspection.
5.Multi-dimensional power quality analysis:

• Waveform real-time display: Simple oscilloscope function to switch voltage/current waveforms of each phase, observe signal distortion, cut-off and abnormal fluctuation;
• Spectrum column diagram display: Intuitively display the percentage content of each harmonic, automatically adjust full-scale display threshold according to harmonic amplitude;
• Harmonic data table output: Output effective value and percentage content of 1–63 times harmonic, calculate total harmonic distortion THD.
   

Data Management & Auxiliary Functions
1.Local storage: Support storage of more than 1,000 groups of test records, each record stores transformer group, CT wiring mode, test time, substation number and full vector data.
2.Data export: Upload historical records to background PC via RS232 serial port; USB interface supports the instrument as a portable storage disk for data copy.
3.Built-in real-time clock and perpetual calendar, automatically mark date and time for each group of stored test data.
4.Device self-checking module: Query instrument serial number, firmware version and ID number for equipment management and program upgrade.
5.Screen lock function: Freeze real-time measurement data for on-site recording without repeated testing.

Front Panel
1.Top area: Color LCD display screen for all measurement interfaces and menu operation;
2.Bottom area: 30-key silicone operation keyboard, including power switch, direction keys, confirmation/exit keys, numeric input keys and F1–F5 auxiliary shortcut keys;
3.Top terminal area: 4 voltage input terminals UA, UB, UC, UN; 3 current clamp ports Ia, Ib, Ic corresponding to each phase sensor.
 

Right Side Expansion Interfaces
1.RS232 serial port: Dedicated communication cable required for data upload and firmware upgrade; ordinary serial cables cannot be matched;
2.Charger port: Matching special power adapter for lithium battery charging;
3.USB port: Connect to PC via dedicated data cable for mass storage access.
 

Standard Accessories
1.MOEORW-W6500 main unit ×1
2.4-core insulated voltage test lead set (yellow/green/red/black) ×1
3.Three matching clamp current transformers (Ia/Ib/Ic phase-specific) ×3
4.Dedicated charging adapter ×1
5.Special RS232 communication cable ×1
6.USB dedicated data cable ×1
7.Operation manual (English & Chinese version) ×1
8.Protective outer packing case ×1
 

1.Relay protection commissioning: Vector verification of two-winding transformer differential protection, busbar differential protection wiring inspection;
2.High-voltage electric energy metering verification: Three-phase three-wire metering cabinet miswiring diagnosis, anti-theft electricity inspection, metering error correction coefficient calculation;
3.Power grid operation monitoring: Secondary circuit electrical parameter real-time measurement, high-voltage side primary load data analysis, three-phase load balance inspection;
4.Power quality detection: Voltage and current harmonic content test, waveform distortion analysis, total harmonic distortion evaluation;
5.Power station & substation acceptance: New power equipment wiring inspection, transformer connection group identification, phase sequence calibration;
6.Industrial power distribution maintenance: Factory power consumption balance test, power factor debugging, abnormal circuit fault vector analysis.

Wiring Operation Specifications
1.Connection sequence rule: Connect test leads to instrument terminals first, then connect to the measured equipment; when dismantling, remove the wiring from the measured equipment first, then disconnect the instrument side to avoid safety accidents.
2.Current clamp operation: Insert clamp sensors into corresponding ports before clamping the current loop; when disassembling, remove all clamps first before pulling out the sensor plugs to prevent CT secondary open-circuit high voltage damage.
3.Polarity requirement: The N marked end of each current clamp is the current outflow side; reverse clamping will cause phase angle measurement deviation.
4.Channel matching: Each clamp current sensor corresponds to an exclusive port; cross use will reduce test accuracy.
 

Battery Maintenance
1.Built-in lithium battery cannot be replaced by users without authorization; incompatible batteries will damage the internal power supply circuit.
2.Daily use: Charge fully every day; if stored for a long time, charge once every 30 days to avoid deep discharge shortening battery life.
3.Single charging time ≥4 hours; internal charging protection circuit supports continuous charging without overcharging risk.
4.If the battery is disassembled and reinstalled, the charger must be connected to release the protection state before normal startup.
 

Daily Maintenance Rules
1.After each test, wipe the clamp jaw and test lead insulation surface to remove metal debris and dust.
2.Store the instrument in the matched protective case, avoid heavy extrusion, falling, high temperature and high humidity storage environment.
3.Regularly check the insulation layer of test leads and alligator clips; replace damaged accessories immediately to prevent electric shock hazards.
4.Do not disassemble the main unit, clamp sensors and internal circuit without professional technical guidance.