Maybe at the maximum expected load current on the circuit being protected. That line should not cross a time / current curve.Physicist3 said:What I would like to know is where the curves should be started, e.g. at what current value should I start the curve?
The purpose of plotting relay current curves is to visualize and analyze the behavior of a relay under different operating conditions. This allows for the identification of any abnormalities or malfunctions in the relay's performance.
Relay current curves are typically plotted by recording the relay's response to a series of increasing or decreasing currents. These data points are then plotted on a graph, with current on the x-axis and time or relay operation on the y-axis.
Plotting relay current curves can provide information on the relay's operating characteristics, such as its pickup and dropout currents, time delay, and sensitivity. It can also help identify any hysteresis or non-linear behavior in the relay's performance.
By comparing the plotted curves to the relay's expected performance, any deviations or abnormalities can be identified and used to troubleshoot and diagnose potential issues with the relay. This can help prevent equipment failures and ensure proper functioning of the relay.
Yes, there are some limitations to plotting relay current curves. The accuracy of the curves may be affected by external factors such as temperature, voltage, or frequency. The curves may also not accurately represent the relay's behavior under extreme operating conditions. Additionally, the plotted curves may not provide information on the internal mechanisms and components of the relay.