Fault detection apparatus for rotor winding of rotary machine
First Claim
1. A fault detection apparatus for a rotor winding of a rotary machine comprising;
- a magnetic flux sensor mounted in proximity to a surface of a rotor having said rotor winding wound thereon, said rotor being mounted in a stator of said rotary machine while leaning an air gap therebetween, said magnetic flux sensor sensing a leakage flux of said rotor winding in each slot of said rotor,a peak value hold circuit for detecting peak values of a pulsing waveform of the signal supplied from said magnetic flux sensor, holding said peak values for a predetermined time period and then resetting the held value,a register for storing past peak values,a peak value processor for comparing the peak value held in said peak value hold circuit with the corresponding one of the peak values stored in said register, anda monitor for indicating a fault in said rotor winding,said processor determining the presence or absence of the fault in said rotor winding based on a result of the comparison of the corresponding peak values and applying a signal indicative of the fault to said monitor when the fault is determined.
1 Assignment
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Accused Products
Abstract
A fault detection apparatus for a rotor winding of a rotary machine comprises a peak value hold circuit, a peak value processor and a monitor. The peak value hold circuit holds peak value of a pulsing magnetic flux waveform supplied from a magnetic flux sensor mounted in proximity to a surface of a rotor, for a necessary time period. The peak value processor sequentially compares the peak value held in the peak value hold circuit with corresponding one of pre-stored peak values of the pulsing magnetic flux waveform to determine if a difference therebetween exceeds a preset level. The monitor indicates the presence or absence of fault based on the result of the comparison of the processor.
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Citations
9 Claims
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1. A fault detection apparatus for a rotor winding of a rotary machine comprising;
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a magnetic flux sensor mounted in proximity to a surface of a rotor having said rotor winding wound thereon, said rotor being mounted in a stator of said rotary machine while leaning an air gap therebetween, said magnetic flux sensor sensing a leakage flux of said rotor winding in each slot of said rotor, a peak value hold circuit for detecting peak values of a pulsing waveform of the signal supplied from said magnetic flux sensor, holding said peak values for a predetermined time period and then resetting the held value, a register for storing past peak values, a peak value processor for comparing the peak value held in said peak value hold circuit with the corresponding one of the peak values stored in said register, and a monitor for indicating a fault in said rotor winding, said processor determining the presence or absence of the fault in said rotor winding based on a result of the comparison of the corresponding peak values and applying a signal indicative of the fault to said monitor when the fault is determined. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification