PRODUCTS

Digital Fault Recording

System Description

The measuring instruments of the SHERLOG family combine the monitoring functions of a high-quality digital disturbance recorder with the manifold features of a power quality monitor in a single system. Not only the identification and recording of transient events, but also the continuous checking and logging of all quality parameters can be carried out on any number of bus bars and lines simultaneously. The wide variety of trigger functions even make it possible to trace faults by monitoring system unbalance, power quantities, individual harmonics or interharmonics.

SHERLOG provides you with an accurate and failsafe means of directly monitoring your power system on site. As SHERLOG is an entirely digital system its functioning is fully software-controlled. All sequences and functions are freely programmable. New functional modules or algorithms in line with new standards can be added simply in the form of updates during manual or automatic software maintenance.

All data and parameters are stored in non-volatile flash RAM modules which do not contain parts susceptible to mechanical wear and tear. This means that in the case of a power failure, recorded data can remain intact over a period of some months even without battery backup. It goes without saying that SHERLOG systems restart independently and automatically on restoration of the power supply.

A distinctive feature shared by all the various models of the SHERLOG family is their compact and modular design. The systems of the C range are especially suitable for rack mounting. Their modular construction makes it possible to configure them for specific applications of any kind and to extend them in accordance with individual requirements. A simple 19" drawer with a height of 3HU can, for example, accommodate a system for measuring 32 analog and 192 binary signals. The systems of the SHERLOG P range have been especially developed as portable devices. Two different models are available with 8 or 16 analog inputs.

All inputs and outputs, whether analog or binary, are galvanically separated from the measurement process. KoCoS linear opto-couplers (LOC technology) are used for the analog inputs guaranteeing high levels of accuracy and the very highest degree of linearity across the entire frequency range from 0 to 50 kHz.