METHOD AND SYSTEM FOR MONITORING WINDING INSULATION RESISTANCE
First Claim
1. A method of determining the resistance of a winding insulation, comprising:
- applying a pulsed voltage having a maximum value and a minimum value to the winding insulation;
determining the maximum current flowing through the winding insulation;
determining the minimum current flowing through the winding insulation;
determining the difference between the maximum and minimum current; and
calculating the winding insulation resistance based on the difference between the maximum and minimum current.
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Accused Products
Abstract
A method and system for determining the resistance of a winding insulation. The method includes applying a pulsed voltage having a maximum value and a minimum value to the winding insulation. The maximum and minimum values of the pulsed voltage are both negative values in certain exemplary implementations. The values of the maximum and minimum current flowing through the winding insulation are determined, and the winding insulation resistance is calculated based on the difference between the maximum and minimum current. A ground fault may be detected based on the calculated winding insulation resistance. The winding insulation monitoring system includes a sense resistor connected to the winding insulation and a pulsed voltage source is coupled to the sense resistor to apply the pulsed voltage to the winding insulation via the sense resistor. A processing device has input terminals coupled to the sense resistor and is programmed to determine the resistance of the winding insulation, which may include calculating the difference between the minimum and maximum current flowing through the sense resistor.
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Citations
21 Claims
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1. A method of determining the resistance of a winding insulation, comprising:
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applying a pulsed voltage having a maximum value and a minimum value to the winding insulation;
determining the maximum current flowing through the winding insulation;
determining the minimum current flowing through the winding insulation;
determining the difference between the maximum and minimum current; and
calculating the winding insulation resistance based on the difference between the maximum and minimum current. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14, 15, 16)
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7. A winding insulation monitoring system, comprising:
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a sense resistor connected to the winding insulation;
a pulsed voltage source coupled to the sense resistor to apply a pulsed voltage having maximum and minimum values to the winding insulation via the sense resistor; and
a processing device having input terminals coupled to the sense resistor, the processing device programmed to determine the resistance of the winding insulation. - View Dependent Claims (8, 9, 10, 11, 12)
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17. A generator system, comprising:
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a rotor;
a field winding situated in the rotor;
insulation isolating the field winding from the rotor;
an exciter circuit connected to the field winding; and
a winding insulation monitor, including;
a stationary portion including a receive antenna and an inductive loop coupled to a power source; and
a rotating portion mounted to rotate with the rotor, the rotating portion including a sense resistor connected to the winding insulation, a processing device having input terminals coupled to the sense resistor, a transmit antenna connected to an output terminal of the processing device, and a pick up coil for inductive coupling with the inductive loop to power the rotating portion;
wherein a pulsed voltage having maximum and minimum values is applied to the winding insulation via the sense resistor, and the processing device is programmed to determine the resistance of the winding insulation based on the pulsed voltage. - View Dependent Claims (18, 19, 20, 21)
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Specification