Apparatus and method for testing stator core of generator
First Claim
1. An apparatus for testing a stator core of a generator comprising:
- a power supply configured to provide an excitation current having a base frequency;
a frequency convertor connected to the power supply, the frequency convertor is configured to convert the base frequency of the excitation current to an excitation frequency that is greater than the base frequency;
a rotor installed within the stator core; and
an excitation cable connected to both axial ends of the rotor forming an excitation winding, with a single loop, between the excitation cable and the rotor,wherein the frequency convertor is connected to the excitation windingwherein during testing the excitation current is transmitted from the power supply onto the excitation winding by way of the frequency converter,wherein the frequency convertor is configured to convert the base frequency of the excitation current to an excitation frequency that is greater than the base frequency, andwherein the rotor is excited by the excitation current with the excitation frequency as a single excitation winding for simulating an operation state of the generator increasing a temperature of the stator core without overheating the rotor during testing.
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Accused Products
Abstract
An apparatus and a method for testing a stator core of a generator are presented. The apparatus includes a power supply. The power supply provides an excitation current having a base frequency. A frequency convertor is connected to the power supply. The frequency convertor converts the base frequency of the excitation current to an excitation frequency that is greater than the base frequency. An excitation cable connects the frequency convertor to a rotor at two axial ends. The rotor is excited by the excitation current with the excitation frequency as a single excitation winding for simulating an operation state of the generator causing hot spots on the stator core without overheating the rotor.
13 Citations
16 Claims
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1. An apparatus for testing a stator core of a generator comprising:
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a power supply configured to provide an excitation current having a base frequency; a frequency convertor connected to the power supply, the frequency convertor is configured to convert the base frequency of the excitation current to an excitation frequency that is greater than the base frequency; a rotor installed within the stator core; and an excitation cable connected to both axial ends of the rotor forming an excitation winding, with a single loop, between the excitation cable and the rotor, wherein the frequency convertor is connected to the excitation winding wherein during testing the excitation current is transmitted from the power supply onto the excitation winding by way of the frequency converter, wherein the frequency convertor is configured to convert the base frequency of the excitation current to an excitation frequency that is greater than the base frequency, and wherein the rotor is excited by the excitation current with the excitation frequency as a single excitation winding for simulating an operation state of the generator increasing a temperature of the stator core without overheating the rotor during testing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for testing a stator core of a generator comprising:
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providing an excitation current having a base frequency by a power supply; converting the base frequency to an excitation frequency by a frequency convertor, wherein the excitation frequency is greater than the base frequency; transmitting the excitation current with the excitation frequency over an excitation winding, with a single loop, formed by a connection of an excitation cable at both axial ends of a rotor installed within the stator core, and wherein the frequency convertor is connected to the excitation winding; and exciting the single excitation winding to perform the testing of the stator core that simulate an operation state of the generator increasing temperature of the stator core without overheating the rotor during testing. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification