Three-phase Clamp Phase-volt-ampere Meter

The MOEORW-WNS30 three-phase clamp phase-volt-ampere meter is a high-precision measuring instrument designed for comprehensive three-phase electrical parameter testing. Adopting Cortex-M3 high-speed processor and 24-bit high-speed ADC sampling architecture, the device delivers stable and accurate calculation of multi-dimensional power grid electrical parameters.

Equipped with a 3.5-inch 320×240 true-color TFT touch screen, the instrument adopts full graphical human-machine interaction without complex physical operation buttons. Built-in rechargeable lithium battery supports long-duration field testing with continuous standby time exceeding 20 hours. Compact portable design adapts to on-site power inspection, metering verification and power quality diagnosis scenarios.

This meter supports synchronous acquisition of three-phase voltage and four-channel current (including neutral line current), and integrates vector diagram display, data storage and real-time power factor analysis modules to realize one-stop testing of low-voltage three-phase power systems.

1. Hardware & Circuit Design

• Embedded Cortex-M3 high-speed microcontroller paired with 24-bit high-speed ADC to complete high-speed synchronous sampling of multi-channel electrical signals;
• 3.5-inch 320×240 TFT true-color touch display, graphical operation interface, equipped with dedicated touch stylus for precise parameter switching;
• Built-in large-capacity rechargeable lithium battery, uninterrupted working standby duration over 20 hours for outdoor field testing;
• Expandable four-channel clamp current sensor interface, compatible with simultaneous measurement of three-phase line current and neutral zero-sequence current.
   

2. Measurement Performance Capabilities

• Synchronously collect three-phase voltage and four-channel current signals, support real-time calculation of phase angles between voltage and current, power angle and grid frequency;
• Automatic phase sequence identification module: green indicator for correct phase sequence, red warning mark for reversed wiring;
• Automatic load characteristic judgment: mark "L" for inductive load, "C" for capacitive load, "-" for resistive load;
• Integrated hexagonal vector diagram visualization function: A-phase (yellow), B-phase (green), C-phase (red) vector real-time rendering for power wiring fault diagnosis;
• Full-range power parameter measurement: active power, reactive power, apparent power and three-phase integrated power factor output.
   

3. On-Site Operation & Data Management Value

• Three measurement mode switching: single-phase, three-phase three-wire, three-phase four-wire via touch screen one-click switching;
• Real-time data hold (HOLD) function to freeze transient measurement data for on-site recording;
• Cyclic automatic data storage: new measurement records overwrite the earliest historical data when storage capacity reaches limit;
• Historical data browsing module with page up/down buttons to retrieve stored measurement records;
• Synchronous storage of volt-ampere phase data and power data to avoid repeated on-site re-testing.

Main Structural Components
1.Main host: integrated touch screen, signal acquisition circuit, lithium battery and signal processing module;
2.High-precision clamp current sensors: multi-channel non-contact current acquisition component, supporting up to 4 sensors simultaneously;
3.Voltage test leads: insulated wiring cables for phase voltage and neutral voltage connection.

Accessory Configuration List

Wiring Operation Instructions

1. Single-Phase Measurement Wiring
Connect live wire to UA terminal of the meter, neutral wire to UN terminal; clamp the current sensor on live wire and insert sensor plug into IA channel port for single-phase voltage, current and power measurement.
2. Three-Phase Three-Wire Wiring
Voltage wiring: Yellow wire to UA, red wire to UC, black wire to UN; connect the other ends to A phase, C phase and B phase of tested circuit respectively. Current wiring: Insert IA and IC current clamps into corresponding ports, clamp sensors on A and C phase current loops.
3. Three-Phase Four-Wire Wiring
Voltage wiring: Yellow, green, red, black test leads connected to UA, UB, UC, UN ports, corresponding to A/B/C three phases and neutral line of power circuit. Current wiring: Install IA, IB, IC clamps on three-phase live wires for synchronous three-phase current collection.

1.Electric power metering cabinet wiring verification and watt-hour meter fault inspection;
2.Transformer winding connection mode identification and load characteristic classification;
3.Low-voltage power distribution cabinet three-phase power quality detection;
4.Industrial factory power consumption balance testing and power factor adjustment debugging;
5.On-site power grid phase sequence calibration and three-phase vector diagram analysis;
6.Power engineering acceptance, line transformation post-construction parameter testing.

Power On & Operation
1.Long press the power button for 3 seconds until a "beep" prompt sounds to complete startup and enter automatic measurement interface;
2.Tap the touch screen icon to switch measurement modes (single-phase / three-phase three-wire / three-phase four-wire);
3.Tap HOLD icon to lock real-time data, save button to store records, page buttons to view historical data;
4.Tap vector diagram icon to enter hexagonal vector display interface for wiring abnormality judgment.
 

Daily Maintenance Requirements
1.After field testing, wipe clamp sensor jaw and voltage test lead insulation surface to remove dust and conductive debris;
2.Charge the lithium battery fully before long-term storage to prevent battery over-discharge damage;
3.Store the instrument in the matched portable case, avoid extrusion, falling and high humidity environment;
4.Do not disassemble the host and current clamp sensor without professional technical support;
5.Regularly check the insulation integrity of test leads and alligator clips, replace damaged accessories in time.