Device and method for non-destructive testing of transient characteristics of turbogenerator rotor conductive screws
A technology of turbogenerator and conductive screw, which is applied in the direction of measuring device, motor generator test, measuring resistance/reactance/impedance, etc., and can solve problems such as complex bending and torsional resonance force, hydrogen leakage, and large conduction current
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Embodiment 1
[0031] Such as figure 1 As shown, a device for non-destructively detecting the transient characteristics of a turbogenerator rotor conductive screw according to the present invention includes a PC terminal connected in sequence, an extremely steep pulse generator, an ultra-high frequency double isolation transformer, and a pulse emission coupling module; The pulse transmitting coupling module is connected with the load, and the synchronous pulse receiving non-inductive voltage divider circuit synchronously receives the characteristic waveform from the load, and the synchronous pulse receiving non-inductive voltage divider circuit amplifies the signal through the nonlinear saturation amplifier circuit and then communicates with the ultra-high-speed A / D module Connection, the PC end receives the signal from the ultra-high speed A / D module;
[0032] The load is composed of a positive or negative excitation lead wire loop and a large shaft of the rotor in an instantaneous short-ci...
Embodiment 2
[0048] Such as image 3 As shown, a 660MW unit of a nuclear power plant was overhauled at 30X, and this method was used to check the conductive screws of the rotor at the J-shaped connecting piece. According to this method, it can be known that since the positive and negative poles are under the same test voltage, test frequency, and test conditions, The positive and negative waveforms of the non-faulty conductive screw should basically coincide on the time axis, and there should be no abnormality in the transient pulse waveform of the positive and negative tests. However, there is a phenomenon of transient characteristic impedance imbalance in the positive rotor (B waveform) of this test. When the airtightness test of the rotor is carried out later, it is judged as unqualified according to the 1.0MPa of the rotor when it leaves the factory. In order to find the leak point, the helium leak detection method was used to find out that there was a slight air leak at the positive p...
Embodiment 3
[0051] The rotor winding of a 650MW generator of a nuclear power plant is in the state of maintenance. The generator rotor is in the bore. The airtight test of the rotor winding has been carried out, and the direct resistance test is normal. Using this method to test, the test position is the positive and negative collector rings, the positive pole of the inner ring has a waveform of 1, the negative pole of the outer ring has a waveform of 2, the test voltage is 50V, the instantaneous internal resistance is 100uΩ, the instantaneous power of the components used is 100W, and the divided piezoresistor The value is 1:3-2:3 adjustable with load. See Figure 5 .
[0052] At the J-shaped connecting piece, conduct the tightness test of the conductive bolt, compare the test waveform of the positive pole with the large axis, and there is a negative reflection peak at the negative pole, resulting in mismatched reflection.
[0053] Under the same test conditions for the positive and neg...
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