Recording functions

Power quality recording

The continuous recording of all power system parameters allows comprehensive power quality analysis to DIN EN 50160 or quality criteria defined by the individual user.

Characteristic values are captured and calculated to IEC 61000-4-30 class A, IEC 61000-4-7 and IEC 61000-4-15. Because quality reports can be evaluated and created automatically as PDF files, it is easy to provide proof of quality whenever required, even without specialist knowledge.

Continuous data recording

The data logger function records measurement data continuously. The recorded data can be downloaded to a central computer without interrupting the measurement.

As a result, data can be recorded continuously for a number of years. The averaging intervals can be configured in line with individual requirements. For each averaging interval, the mean value for the given time and the highest and lowest single RMS values for a system cycle are recorded with an exact time stamp. Long-term recordings provide comprehensive information on the entire power system, expose slow changes, as can result from a changing load or generator structure, and reveal potential for energy savings.

Event recording

Event recording provides information on the time, level and duration of limit value violations and a classification of events to EN 50160, for example. If required, the event signatures can also be recorded with a time resolution of half a period.

Fast fault recording for power system faults

When a limit value violation occurs, all analog and binary  signals are recorded with a configurable resolution of 100 Hz to 30 kHz. The recording comprises separately configurable time windows for pre-fault, fault and post-fault periods. The fault recording duration can either be set to a fixed length or can be controlled by the actual duration of the event.

Slow fault recording

In addition to the analog and digital signals which are measured directly, the RMS recorder can also record all the quantities calculated on the basis of these signals, such as frequency, unbalance, positive sequence system, negative sequence system and zero sequence system, active power, reactive power and apparent power, harmonics etc. The sampling rate can be set between 1 Hz and double the system frequency (100 Hz/120 Hz). The recording is ideal for detecting and assessing slow processes, such as power swings, or for generator monitoring.

Recording of digital events and states

Binary inputs are primarily used to read in signals from protection relays, circuit breaker positions or machine conditions, for example, which are of decisive importance for the analysis of fault records. The binary inputs can also be used to trigger fault records in order to obtain a high-resolution record of the state of the power system at the moment of switching.