electricpy.fault.ct_timetosat¶

electricpy.fault.ct_timetosat(Vknee, XoR, Rb, CTR, Imax, ts=None, npts=100, freq=60, plot=False)[source]¶

Electrical Current Transformer (CT) Time to Saturation Function.

Function to determine the “time to saturate” for an underrated C-Class CT using three standard curves described by Juergen Holbach.

Parameters:¶

Vknee : float¶

The knee-voltage for the CT.

XoR : float¶

The X-over-R ratio of the system.

Rb : float¶

The total burden resistance in ohms.

CTR : float¶

The CT Ratio (primary/secondary, N) to be used.

Imax : float¶

The (maximum) current magnitude to use for calculation, typically the fault current.

ts : numpy.ndarray or float, optional¶

The time-array or particular (floatint point) time at which to calculate the values. default=_np.linspace(0,0.1,freq*npts)

npts : float, optional¶

The number of points (per cycle) to calculate if ts is not specified, default=100.

freq : float, optional¶

The system frequency in Hz, default=60.

plot : bool, optional¶

Control argument to enable plotting of calculated curves, default=False.