Model Number Breakdown:

• SPW: Single-Phase / Three-Phase Power Meter (Yokogawa internal designation)
• 482: 3-phase 4-wire measurement configuration
• 53: Specific variant — likely indicates RS-485 + Ethernet communication with Modbus TCP/RTU protocol

Key Specifications:

• Measurement Type: 3-Phase 4-Wire (3V + 3I)
• Voltage Range: 15–600 V AC (auto-range)
• Current Range: 0.1–5 A AC (via CT); 0.05–2.5 A AC (direct)
• Active Power Accuracy: ±0.1% of reading + ±0.1% of range (at 50/60 Hz)
• Reactive Power Accuracy: ±0.2% of reading + ±0.2% of range
• Power Factor Accuracy: ±0.005 (at PF = 1.0)
• Frequency Range: 45–65 Hz (accuracy ±0.01 Hz)
• Harmonic Analysis: Up to 50th order (voltage and current)
• Energy Metering: Active energy (kWh), Reactive energy (kvarh) — ±0.5% accuracy (Class 1 per IEC 62053-21)
• Display: LCD with backlight (numeric + bar graph)
• Communication: RS-485 (Modbus RTU/ASCII), Ethernet (Modbus TCP, HTTP)
• Power Supply: 85–265 V AC/DC (universal)
• Power Consumption: ≤ 5 VA
• Operating Temperature: -10 to +50 °C
• Protection Rating: IP54 (front panel)
• Dimensions (Panel Mount): 96 mm × 96 mm (1/4 DIN) or 72 mm × 72 mm (1/8 DIN) — verify from datasheet

Functional Features:

• Comprehensive Power Measurement: V, I, P, Q, S, PF, f, THD, harmonics (1–50th), energy (kWh/kvarh), demand (max/min/average)
• Maximum Demand Recording: Records maximum demand over configurable intervals (15/30/60 min)
• Alarm Outputs: 2 relay outputs for over/under voltage, over/under current, over/under power factor
• Pulse Output: Optically isolated pulse output (1000 pulses/kWh) for energy meter verification
• Data Logging: Internal memory stores up to 10,000 records with timestamp
• Web Server: Built-in HTTP web server for remote monitoring via standard web browser

Material Composition:

• Front Bezel: ABS + PC blend, flame-retardant (UL94 V-0)
• Housing: Cold-rolled steel with powder-coated finish
• Terminal Blocks: Phosphor bronze with tin plating; screw-type
• Display Cover: Tempered glass with anti-reflective coating
• PCB: FR-4 epoxy glass, conformally coated

Structural Characteristics:

• Form Factor: Panel-mount (1/4 DIN: 96×96 mm or 1/8 DIN: 72×72 mm)
• Dimensions: 96 mm (W) × 96 mm (H) × 80 mm (D) (1/4 DIN, approximate)
• Weight: Approximately 0.6 kg
• Cutout Size: 92 mm × 92 mm (1/4 DIN) or 68 mm × 68 mm (1/8 DIN)
• Terminal Connection: Screw terminals for voltage and current inputs; CT clamp input option available

Operating Principle:
The SPW482-53 samples all 3 phase voltages and 3 phase currents simultaneously using high-speed A/D converters (sampling rate: 256 samples/cycle at 50 Hz). The digital samples are processed by a DSP (Digital Signal Processor) that calculates:

• RMS values of voltage and current (true RMS, not average-responding)
• Active power (P = Σ Vi × Ii × cos φi) using instantaneous power method
• Reactive power (Q) using the 90° phase-shift method
• Power factor (PF = P/S)
• Harmonics via FFT (Fast Fourier Transform) analysis up to the 50th order
• Energy by time-integration of power

All calculated values are displayed on the LCD and transmitted via RS-485 (Modbus RTU) or Ethernet (Modbus TCP/HTTP) to the host system. The pulse output generates 1000 pulses per kWh for external energy verification.

Advantages & Highlights:

• Class 1 Energy Accuracy: ±0.5% — suitable for revenue-grade metering and billing applications
• 50th Order Harmonics: Full harmonic analysis for power quality compliance (IEEE 519, IEC 61000-4-30)
• Dual Communication: Both RS-485 and Ethernet — flexible integration with any SCADA/DCS/EMS
• Web-Based Monitoring: Built-in HTTP server eliminates need for dedicated software

Applicable Industries:

• Electrical Utilities (Substation/Feeder Metering)
• Industrial Facilities (Energy Management)
• Commercial Buildings (Energy Monitoring)
• Data Centers (Power Quality Monitoring)
• Renewable Energy (Solar/Wind Farm Metering)
• Manufacturing Plants (Motor/Drive Energy Monitoring)

Installation Requirements:

• Mount in a 1/4 DIN (96×96 mm) or 1/8 DIN (72×72 mm) panel cutout with gasket seal
• Connect voltage inputs directly to the terminals (for voltages ≤ 600 V) or via PT (potential transformer) for higher voltages
• Connect current inputs via CT (current transformer) — never connect current directly unless within the 0.05–2.5 A range
• Use shielded twisted-pair cable for all signals; ground shields at the meter end only
• For Ethernet communication, use Cat 5e or higher cable (max 100 m)
• Provide 85–265 V AC/DC power supply

Usage Precautions:

• Never open the voltage terminals while the circuit is energized — 600 V AC is lethal
• Verify CT ratio is correctly programmed in the meter — an incorrect CT ratio will cause gross energy measurement errors
• Do not exceed the maximum input voltage of 600 V AC — use a PT for higher voltages
• Perform zero calibration for current channels after CT installation
• Do not expose the meter to temperatures above +50 °C or humidity above 85% RH (non-condensing)
• The pulse output is optically isolated — do not apply external voltage to the pulse terminals