Family of modular Carlo Gavazzi WM20, WM30 and WM40 power network analysers for panel mounting (96 × 96 mm) in auxiliary switchboards of AC and DC traction substations. They measure voltage, current, active/reactive/apparent power, power factor, frequency, active and reactive energy, and harmonics (voltage and current THD up to the 32nd harmonic) in single-, two- and three-phase systems, including wild-leg configurations. Active energy accuracy class 0.5S (EN 62053-22). Current measurement at 1 A or 5 A via current transformers, voltage up to 400 V L-N / 690 V L-L, auxiliary supply 100–240 V or 24–48 V AC/DC. Modular expansion with digital outputs, analogue inputs/outputs, and Modbus RTU/TCP, BACnet IP/MS-TP and Profibus DPV0 communication. Compliance: EN 61010-1, EN 62052-11, EN 62053-22/23. Applications: monitoring energy consumption and power quality in traction substation switchboards, load balancing and phase unbalance supervision, and integration of measurements with SCADA/BMS systems.
