In this paper, the over-current and over-voltage fault characteristics of the electromotor are analyzed and the fundamental protective measures for various current and voltage troubles are put forward. Meantime, the protective schemes are designed and applied to HT6L1-400Z/1140 flameproof intrinsically safe intelligent vacuum magnetic control station for mine, which have stabilities, reliabilities and important applied values.
Besides,this paper studies on the extraction method for fault characteristic signal and analyzes the problems whicharised when adopting FFT to process spectrum analysis and analyze the simulation data.
According to the above analysis, the feasibility to use the surface vibration signals of cylinder head to diagnose the valve train faults is discussed, completing the valve train fault simulating experiment and building the method and principles for abstracting the fault characteristic.
The fault analysis method for rotor windings of induction motors is introduced. Then a discussion is made on the current distribution and its variations in each rotor bar and each section of end rings under different numbers of broken rotor bars, and the variation of fault characteristic value of rotor windings.
A new wavelet method based on lifting scheme to match weak fault characteristics is proposed.
Fault characteristics are considered to be generated by dynamical exosystems that are switched via equality constraints to overcome the augmented state observability limiting the number of diagnosable faults.
Analyses of seismic data from 1900 to 2000 define the subduction zone, which in turn is divided into 222 subfaults based on the fault characteristics.
Neural networks circumvent the combinatorial explosion by taking advantage of the fact that the fault characteristics of multiple simultaneous faults frequently correlate to the fault characteristics of the individual faulted components.
Compile Earth Science Information -Compile historic seismicity and fault characteristics including earthquake magnitudes and recurrence intervals.
Then, using the instantaneous frequency extraction principle of the Hilbert Transform, the rotor broken-bar fault characteristic frequency of 2sfs can be exactly extracted from the IMF component, which includes the rotor fault information.
According to the fault characteristic of the imperial smelting process (ISP), a novel intelligent integrated fault diagnostic system is developed.
The R-X diagram for the earth fault characteristic of relay V, protecting line S2-S5, is shown in figure 5.
The relay, therefore, uses a typical biased differential earth-fault characteristic supervised by a directional element.