Pázmándi Graphical Construction

This page produces the Pázmándi plot of third-harmonic voltages across a synchronous generator. Enter zero-sequence resistances (in ohms) and capacitances (in microfarads).

Pázmándi, L., Stator earth-leakage protection for large generators, IEEE Trans. PAS-94, no.4, pp.1436-1439, July/Aug. 1975.

Zero-Sequence Shunt Resistances (Ohms)

(0 = not connected)

(RN)

(RO)

(RT)

Zero-Sequence Shunt Capacitances (µF)

(0 = not connected)

(CN)

(CO)

(CT)

Include Fault

RF (ohms)

Freq (Hz)

Sweep Fault RF Starting RF (ohms)

Fault location (N = −0.5 to T = +0.5)

pickup (V)

VG3 (V)

Find 27TN Reach

Find "27TN Normalized" Reach pickup (pu)

Find Beta 59THD Reach Beta

Find 59DRAT Reach RAT Pickup

Show labels on plot

x=0.0000, y=0.0000