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Distributed power measurement with SCT current transformers

08.09.2020

By completing the power measurement chain from the sensor to the cloud, PC-based control specialist Beckhoff enables a significant simplification of energy management approaches and improves the availability of machines and production facilities. Permanently integrated and seamless power measurement across entire installations allows users to perform extensive inline analyses to detect any deviation and take quick corrective action. Starting point of the Beckhoff measurement chain: SCT current transformers.

Dr. Fabian Assion discusses distributed power measurement and SCT current transformers in a 30-minute webinar. In his role as Product Manager I/O, he will present actual use cases and provide answers to the following questions:

  • How can Beckhoff products be used to easily measure kA currents?
  • Why does distributed power measurement from Beckhoff make an application simpler and more transparent?
  • When bringing power measurement data to the cloud there is no need for a PLC programmer – why is that?
  • How easy is it to realize predictive maintenance via power measurement?

More about this video

EL3443

The EL3443 EtherCAT Terminal enables the measurement of all relevant electrical data of the supply network and carries out simple pre-evaluation. The voltage is measured via direct connection of L1, L2, L3 and N. The current of the three phases L1, L2 and L3 is fed via simple current transformers. All measured currents and voltages are available as root-mean-square values. In the EL3443 terminal, the effective power and energy consumption for each phase are calculated. The RMS values of voltage U and current I as well as the active power P, apparent power S, reactive power Q, frequency f, phase shift angle cos φ and harmonic are available. The EL3443 offers extended functionality for mains analysis and energy management.

EL3446

The EL3446 EtherCAT Terminal enables the measurement of all relevant electrical data of the supply network and carries out simple pre-evaluation. Since the EL3446 itself has no voltage inputs, the voltage measured values are transmitted via EtherCAT by an EL3443 to be installed once per network. The current of up to six phases is fed via simple current transformers. All measured currents and voltages are available as root-mean-square values. In the EL3446 terminal, the effective power and energy consumption for each phase are calculated. The RMS values of voltage U and current I as well as the active power P, apparent power S, reactive power Q, frequency f, phase shift angle cos φ and harmonic are available. The EL3446 offers extended functionality for mains analysis and energy management.

EL3453

The EL3453 EtherCAT power measurement terminal is an advancement based on the EL3413. With up to 690 V AC, the voltage inputs are optimised for the direct monitoring of high-capacity generators, as in the wind power industry, for example. No upstream voltage transformer is required. The four current inputs are electrically isolated so that the terminal can be used in all common grounded current transformer configurations such as 2- or 3-transformer configurations with star or delta connection incl. neutral conductor current measurement. The EL3453 can be used for simple grid analysis up to the 63rd harmonics analysis. Alternatively, all readings can be combined in a power quality factor for simplified diagnostics. Like all measured terminal data, the harmonic content can be read via the process data. The EL3453 offers the “ExtendedRange” feature enabling the use of the full technical measuring range, which equals 130 % of the specified nominal measuring range.