AC-DC Watt Transducer, Models WT1ph and WT3ph, measure all waveform types from sinewaves, on/off dutycycle to complex VFD applications, DC, 1Hz-50kHz

Product Specifications

Functionality
• Measures inport export energy flow change in <10mS
• A crucial control element in MicroGrid environments to switch and direct energy
• Measures Watts, VARs, VA, PF, Vrms, Vpk, Vcf, Arms, Apk, Acf, Freq and Ainrush
• Measures 3 phase totals: Sum HP, Sum Watts, Sum VARs, Sum VA, Sum PF
• Accurate with all waveshapes or load types: DC and variable frequency AC
• Works with frequencies from DC to 5000Hz fundamentals, bandwidth DC-50kHz
• Measures continuous and burst-type waves, pulsing loads and waveforms

Basic Specification
• Available input ranges from 2V to 600V ac or dc from 5%-125% of range
• Analog Outputs x3, isolated: 0-5V, 0-10V, 4-20mA: assigned to any measurement like kW or kVAr
• Fast response time 1mS, Auto or manual scaling
• Rated working voltage insulation 1.5kVpk, flash tested 2.5kV for 1 minute
• Screw terminal input/output connections with terminals covers
• Auxiliary power input 12/24/48/110/230 Vdc or Vac

Approvals and Environment
• Certified accuracy Class 0.2%, 0.5% or 1.0% at +23°C ±5°C, traceable to NIST/NPL
• Working temperature range 0°C - 50°C / Functional temp range –10°C - 70°C
• CE Marked, FCC and UL Compliant
• UL94V0, IEC1010 cat II, IEC348, DIN 57411
• Case IP50, terminals IP30 complies with IEC529

Connectivity
• HMI options for local set-up and display
• Modbus TCP/IP (over Ethernet)
• Supplied with LV Modbus Test Panel for Windows and Master-Slave configurations
• NI Labview Driver support
• Interface via WiFi Bridge to mobile devices, Profibus, ProfiNet and RS485

Description

Unlike many Watt and Energy Transducers, our Model WT3ph Series uses high-speed simultaneous sampling with internal analog-to-digital converters, these provide fast accurate ac measurements regardless of waveshape or frequency. This includes real power (W), real power factor (PF) reactive power (VAr) delivered to a load. Bi-directional capability means power can be measured in both directions, with indication of import and export. Especially in applications like Locomotive, Electric vehicle where motoring and regeneration occurs with power and energy. Models are available in a variety of configurations with current ranges up to 1000A and nominal voltage ratings up to 600V. Models are available in 1, 2 and 3 element versions; suitable for all single-phase and three-phase power systems. RS485, CAN BUS, Modbus and Analog output signals are available. Forward (consumed) power is indicated with a positive polarity and reverse (generated) power with a negative polarity. Unidirectional outputs (4-20mA) indicate forward (consumed) power, 4-12-20mA allow for both directions. Easy scaling of VTs and CTs is possible. All outputs are galvanically isolated from the measured inputs and instrument power.

The sensor power input is designed to operate over a wide range associated with process control and sub-station auxiliary dc supply systems.  Some typical applications are voltage monitoring in Solar PV, Dc drives, UPS, Frequency Changers, Process Control, Rail Transportation, and EV. For all products, a NIST/NPL/UKAS traceable calibration certificates of conformance are available.

Applications

The WT3ph fast-response capability is aligned to control systems for renewable energy sources found in microgrids. A microgrid is a group of interconnected loads and distributed energy resources that acts as a single controllable entity with respect to the grid. It can monitor connection/disconnection from the grid allowing operation in grid-connected or island mode - improving the utilisation of available energy and capturing short-term energy bursts previously lost or discarded

Data sheets

WT3ph Data sheets