Detection and Classification of Turn Fault and High Resistance Connection Fault in Permanent Magnet Machines Based on Zero Sequence Voltage

Abstract

This is a repository copy of Detection and classification of turn fault and high resistance connection fault in permanent magnet machines based on zero sequence voltage.

High-Frequency Voltage Injection Based Stator Interturn Fault Detection in Permanent Magnet Machines

“…Only under turn fault conditions, the ratios deviate from 1. To obtain an overall signature of the broken symmetry, the fault indicator is defined as the standard deviation of the three ratios, given in (19). The abnormal changes in all three phase high frequency currents due to turn faults are captured, thus enhancing the detection effectiveness.…”

“…It can reduce the influence of the current regulator and working conditions, but the performance at transient states and the capability of differentiating from the HRC fault have not been discussed yet. These issues are explicitly addressed in the technique in [19]. However, the fact that it needs additional hardware and the access of phase neutral point could increase the cost and limit its application.…”

A Novel Stator Turn Fault Detection Technique by Using Equivalent High Frequency Impedance

“…The schematic circuit of the 3-phase machine drive is illustrated in FIGURE 8. The phase self-inductances and mutual-inductances can be derived by and according to [19]. A turn fault is assumed in phase A and the fault turns ratio is 0.1 for both machines.…”

“…Therefore, the voltage signals should also be considered to improve the fault detection capability. In [19], the turn fault is detected by monitoring the zero sequence HF PWM voltage. And the classification with the high resistance fault is analyzed by distinguishing the high frequency and low frequency components.…”

Discrimination Method of Interturn Short-Circuit and Resistive Unbalance Faults for Synchronous Condenser

“…In [29], the zero-sequence voltage or negativesequence current are used to discriminate the interturn short-circuit fault and the resistive unbalance of induction machines. In [30], a new fault discrimination technique by utilizing both the high and low frequency components of the zero-sequence voltage is proposed, which can accurately discriminate the interturn short-circuit and resistive unbalance faults of PMSMs. In [31], the interturn short-circuit and resistive unbalance faults of PMSMs are discriminated by injecting high-frequency signal and observing the amplitude of high-frequency signal in zerosequence voltage.…”