Oct 1, 2019

New test tool for non-conventional instrument transformers


ELCOME dear friends of protection- and control engineering. Omicrons brand-new LLX accessory units are used to expand CMC 430 test sets with six low level outputs. They are connected to one of the CMC 430s expansion ports, which powers and controls them.

LLX can be used for testing devices with sensor inputs by simulating the output signals of low power voltage and current sensors, such as voltage dividers, Rogowski coils or low power CTs. Unique is that Rogowski coil signals can be simulated not only in the steady state but also for transients. LLX can also be used to control external amplifiers like CMS 356. To accommodate the requirements of different applications LLX is available in four different types.

LLX1 – Testing devices with sensor inputs

LLX1 is the ideal solution for testing protection and measurement devices with inputs for voltage and current sensors. In addition to simulating the phase voltages and currents, LLX1 is also capable of simulating residual voltage and current for dedicated inputs.


A wide range of cables are available for easily connecting LLX1 to different devices that have specific connectors and pinouts:

🌐 ABB Relion / RJ45 (named "LAB1")

🌐 ABB REF542plus / 2 x Twin-BNC (named "LAB2")

🌐 Siemens Siprotec Compact / RJ45 (named "LSI1")

LLX2 – Low level interface for external amplifiers and accessories

LLX2 provides a standard low level interface for controlling external amplifiers such as the CMS 356 and other low level accessories with a 16-pin LEMO-type connector.

LLX2, Omicron

LLX3 – Versatile low level outputs with 4 mm sockets

LLX3 provides low level outputs using standard 4 mm sockets. This makes LLX3 a flexible solution for further applications such as experimental setups.

LLX3, Omicron

LLX4 – Low level outputs for recloser and sectionalizer controls

LLX4 is used in combination with OMICRON’s test cables for recloser and sectionalizer controls that are equipped with sensor inputs.

LLX4, Omicron

For further informations go direct to the product page of the vendor (product page).

Kind regards