LEM has introduced the TT series of compact split-core AC current transformers. The core material used is a new type of ferrite with improved magnetic permeability, allowing the accurate measurement of AC signals in an extended frequency range that includes 50/60 Hz.
These transformers feature an absolute accuracy better than 1% at the nominal current and even better for lower primary currents. The ferrite material provides linearity of better than 0,1% even at very low levels, and the transformers have a particularly low phase shift between measured voltage and current of 1,5° ±1°. The hard and dense core allows very small air gaps to be achieved and is virtually insensitive to ageing and temperature changes, in contrast to laminated FeSi or FeNi materials.
Two ranges of primary current measurement are available: 50 A and 100 A. The dimensions of the TT 50-SD are only 36,5 x 43 x 31,5 mm with an 8 mm diameter-sensing aperture for non-contact measurement, whilst the TT 100-SD measures 44,5 x 51 x 36,5 mm with a 16 mm diameter-sensing aperture.
With a 3000:1 ratio, the TT 50-SD and TT 100-SD have low output currents (respectively below 16,66 mA or 33,33 mA). This, together with the internal output-protection circuit, guarantees safe and easy installation without the need to shut down operation since there is no risk of producing a high voltage surge when the transformers are opened, unlike 1 A or 5 A output products.
Being small, safe, self-powered and split-core, the TT current transformers are very easy to install and put into operation. They are ideal for distributed measurement systems and can be retro-fitted into existing installations and non-interruptible equipment. Principal applications will be in the field of energy sub-metering and cost allocation, dynamic consumption and peak analysis, energy waste or defective equipment detection and power quality control.
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