Australian Grid Frequency Live — Queensland NEM Region

Data Explorer - Histogram

Explore the distribution of original approximately one-second observations over a selected period.

Checking available history…

Duration from Period Start

or

Australia/Brisbane (UTC+10). Original observations cover approximately one second each. Maximum selection: 24 hours and 100,000 source records.

Choose a period to explore.

Frequency distribution

Hz

Frequency histograms count original observations; RoCoF histograms count eligible 1-second rate estimates. Bins are centred on 50 Hz, 0 mHz deviation or 0 mHz/s RoCoF. Missing measurements are not zero-valued observations.

RoCoF shows signed [f(t) − f(t − 1 s)] / 1 s at recorded timestamps, in mHz/s. The earlier frequency is linearly interpolated from original readings. Windows crossing gaps, invalid readings, duplicate timestamps, sequence breaks or timing discontinuities are excluded. Both ends must be within the selected period. No extra averaging is applied; this does not resolve subsecond peak RoCoF.