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Power analyser runs to 50th harmonic

A Carlo Gavazzi product story
Edited by the Engineeringtalk editorial team May 2, 2002

The WM3-96 smart power analyser is one of very few which can perform FFT analysis to the 50th harmonic, as required by the G5/4 standard.

With the advent of G5/4 the control and monitoring of electrical loads has become yet more important.

The principle embodied in G5/4 is to set levels for the harmonic currents imposed on the network.

As part of this, G5/4 set limits for harmonics to the 50th order, whereas the previous G5/3 standard was limited to the 20th order harmonic.

As a result, harmonic measurement and analysis has never been more vital.

In response, Carlo Gavazzi has introduced the WM3-96 smart power analyser, one of very few which can perform FFT (fast Fourier transform) analysis to the 50th harmonic, enabling users to have both a numerical and graphical display of harmonic content.

Further advantages include continuous supply monitoring, automatic recording of alarms, 48 partial and four total energy meters, and tariff management.

The WM3-96 can handle both balanced and unbalanced three-phase systems up to 30kA and 600kV as well as single-phase systems.

It has an accuracy class of 0.5, samples at 10Hz and is available with a variety of input/output options that, due to the modular construction, can be added as required.

The WM3-96 has 25 predefined display pages for data and one page that is freely programmable by the user to show the most important or common variables.

Furthermore, the WM3-96 is protected to IP65, carries CE marking, is approved by both UL and CSA and meets all current standards relating to EMC and product and safety requirements for energy measurement.

When fitted with just the input module and power supply, the WM3-96 can be used as a local indicator/analyser with all data displayable on screen.

Should pulse outputs be required to interface into existing systems, up to four can be provided (DIN43864), simply by plugging in the relevant module.

These can be used to transmit real time data (Wh or Varh) or data from any of the 52 internal energy meters.

Similarly, any of the 400 or so measured (or calculated) variables can be assigned to analogue output modules, in either VDC or mA format.

Up to four analogue outputs can be fitted.

For monitoring of critical variables, up to four alarm outputs can be fitted - either relay or open-collector transistor.

Again, these are freely configurable to monitor any variable and offer up or down alarm (with or without latch), programmable setpoint, hysteresis and time delay.

Furthermore, the relay versions can be set as either normally energised (NE) or normally de-energised (ND).

Finally for high-level systems, the WM3-96 offers both RS485 and RS232 serial communications modules.

As a result, all data is available all the time.

If the RS232 module is used, this includes a real-time clock and offers event logging as standard.

The communication protocol used as standard for both modules is ModBus-RTU.

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