Split-core current transformers for active power monitoring
21 February 2007
Power Electronics / Power Management
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.
Further reading:
High-precision current transducer
Power Electronics / Power Management
Danisense announces its new high-precision DP12IP current transducer designed for isolated DC and AC current measurement in demanding PCB-mounted power electronics applications.
Read more...
Secure holder for protected 18650 batteries
Power Electronics / Power Management
Designed for protected 18650 batteries up to 70 mm long, the holder offers secure retention for portable, industrial, and embedded applications.
Read more...
More room to scale
Altron Arrow
Power Electronics / Power Management
With the latest STM32H5 lines from STMicroelectronics, you can now scale within the same platform, from a compact 1 Mbyte device to higher-memory MCUs for graphics-rich and feature-heavy designs.
Read more...
Surface mount power amplifier for high-power applications
RF Design
Power Electronics / Power Management
The GNA-63-5W+, from Mini-Circuits, is a GaN MMIC Power Amplifier (PA) designed for demanding RF applications requiring high efficiency, excellent linearity, and a compact footprint.
Read more...
1200 V QSiC modules
Power Electronics / Power Management
SemiQ Inc has launched the QSiC Dual3, a family of 1200 V half-bridge MOSFET modules for motor drives in data centre cooling systems, grid converters in energy storage systems, and industrial drivers.
Read more...
MCOTS transient filter for military applications
RFiber Solutions
Power Electronics / Power Management
SynQor has announced the new MCOTS-F-28-T-HE transient half-brick filter, the latest addition to its MCOTS product family.
Read more...
Expanded range of high-thermal-performance QSiC modules
Power Electronics / Power Management
SemiQ’s half-bridge series for data centre power converters and industrial motor drives features low RDSON SiC MOSFETs and parallel SBD diodes for best-in-class power density and conversion efficiency.
Read more...
Transporting lithium batteries and IoT devices
Power Electronics / Power Management
With billions of rechargeable and non-rechargeable lithium cells and batteries powering most of the world’s consumer and industrial electronic devices, shipping them to customers through vast global logistics chains is often an overlooked topic.
Read more...
Setting a new benchmark for high-power DC load testing
Conical Technologies
Test & Measurement Power Electronics / Power Management
The new ITECH IT8900G/L high-speed, high-power DC electronic load offers a powerful combination of speed, scalability, precision and high-power density.
Read more...
Quality batteries are critical for IIoT
Uniross Batteries
Power Electronics / Power Management
Batteries intended for use in industrial operations must indeed offer complete reliability under extreme environmental conditions, resistance to vibration and harsh environments.
Read more...
printer friendly version