Three-Phase Digital Combined Meter - High-Quality China Suppliers and Factory for Industrial Power Monitoring
Product Overview
Its core application focuses on the accurate measurement and visualization of three-phase current, three-phase voltage, and grid frequency, with scalable parameter options to meet diverse user requirements for power system diagnostics and efficiency analysis.
The Instrument offers flexible, configurable measurement ranges to accommodate both three-phase three-wire (3P3W) and three-phase four-wire (3P4W) system topologies, with the following parameter coverage:
- 1 Current Measurement: Accurate RMS current detection for all three phases, denoted as IA (Phase 1 Current), IB (Phase 2 Current), and IC (Phase 3 Current).
- 2 Voltage Measurement: Comprehensive RMS voltage monitoring including both phase voltages (UA = L1-N, UB = L2-N, UC = L3-N) and line-to-line voltages (UAB = L1-L2, UBC = L2-L3, UCA = L3-L1), totaling six independent voltage channels.
- 3 Extended Parameter Options: The Instrument is available in multiple variants with additional measurement functions to suit specific application needs:
- Basic Variant Grid frequency measurement (typically 45–65 Hz)
- Mid-Range Variant Frequency + power factor (capacitive/inductive range) measurement
- Advanced Variant Frequency + active power (W/kW/MW) measurement
The Instrument utilizes state-of-the-art SMT for component assembly, resulting in a highly compact, dense circuit layout. This design minimizes internal signal interference, enhances structural stability, and delivers superior operational reliability — even in harsh industrial environments characterized by high vibration, temperature fluctuations, or electromagnetic interference (EMI). The compact form factor also supports flexible DIN-rail or panel-mount installation, saving valuable space in control cabinets.
Equipped with a high-precision AC sampling module and true RMS measurement algorithm, the Instrument ensures accurate parameter readings regardless of waveform distortion caused by non-linear loads (e.g., variable frequency drives, rectifiers, switching power supplies, or arc furnaces). Unlike average-value sensing meters, this technology eliminates measurement errors induced by distorted waveforms, making the Instrument ideal for modern power systems with complex load profiles.
The Instrument features a user-programmable display multiplier function, enabling seamless calibration to match the ratio of external current transformers (CTs) with primary current ratings ranging from 5 A to 10,000 A. This flexibility allows the local digital display to directly show the primary system current values, eliminating the need for manual ratio calculations and simplifying on-site data interpretation for field technicians. The Instrument is compatible with standard CT models rated for 1 A or 5 A secondary output, ensuring easy integration with existing power monitoring infrastructure.
Technical Parameters
Technical Parameters |
Index |
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| Input | Network | Three-phase three-wire, three-phase four-wire | |
| Voltage | Rated value | AC 0~500V | |
| Over load | Consistent: 1.2 times; Instantaneous: 2 times / 30s | ||
| Consumption | <0.5VA (each phase) | ||
| Impedance | >500kΩ | ||
| Current | Rated value | AC 1A, 5A | |
| Over load | Consistent: 1.2 times; Instantaneous: 2 times / 1s | ||
| Impedance | <2mΩ | ||
| Frequency | 45–65Hz | ||
| Output | Communication | Output mode | RS485 |
| Protocol | MODBUS_RTU | ||
| Baud rate | 1200, 2400, 4800, 9600 | ||
Technical Parameters |
Index |
||
| Output | Analog Quantity | Channel quantity | 4 channels |
| Output mode | 0~20mA, 4~20mA | ||
| Load ability | ≤400W | ||
| Switching Value | Channel quantity | 4 channels | |
| Output mode | Normally open relay contact output | ||
| Contact capability | AC 240V / 0.1A | ||
| Switching value input | Four channel dry contact input modes | ||
| Display mode | LED (Red) | ||
| Measuring Accuracy | Voltage, Current | ± (0.5%FS + one digit) | |
| Active power, Reactive power | ± (0.5%FS + one digit) | ||
| Frequency | ± 0.1Hz | ||
| Power factor | ± 0.01PF | ||
| Source | Scope | AC 220V 50/60Hz or AC/DC 85~265V | |
| Consumption | <5VA | ||
| Safety | Withstand Voltage | Input and source | >2kV 50Hz / 1min |
| Input and output | >1kV 50Hz / 1min | ||
| Output and source | >2kV 50Hz / 1min | ||
| Insulating resistance | Any two of input, output, source, casing >20MΩ | ||
| Environment | Temperature | Operation: -10°C ~ 50°C | |
| Storage: -25°C ~ 70°C | |||
| Humidity | <85%RH, free of wet and corrosive gas | ||
| Elevation | ≤3000m | ||