The invention discloses an optical fiber current transformer fault feature extraction method, device and system. The method comprises the steps of carrying out the wavelet packet decomposition of an original output signal of an optical fiber current transformer through employing an optimal wavelet basis function, and obtaining a plurality of frequency band signals with different frequencies, basedon a preset low-frequency range, a power-frequency range and a high-frequency range, reconstructing a low-frequency signal, a power-frequency signal and a high-frequency signal by utilizing the signals of each frequency band, calculating a time domain feature index based on the low-frequency signal, the power frequency signal, the high-frequency signal and the original optical fiber current transformer output signal, combining and constructing an original fault feature vector set based on all time domain feature indexes, and processing the original fault feature vector set by adopting a principal component analysis method to obtain a fault feature vector set corresponding to the gradient fault. The influence of high-frequency components and power-frequency components on weak fault signalsin the operation process of the power grid is reduced, and the accuracy of fault diagnosis by using output signals is improved.

Optical fiber current transformer fault feature extraction method, device and system

The invention discloses a fault diagnosis system for an optical fiber current sensor. The fault diagnosis system comprises a photoelectric detector, a signal conditioning module, an adder circuit module, an AD sampling module and a data processing module. The invention further discloses a fault diagnosis method for the optical fiber current sensor. The system can be used for detecting whether thewhole optical path system of the optical fiber current sensor fails or not; the fault detection system is established on the basis of an optical fiber current sensor measurement system without extra circuit components and systems and extra optical path loss, so that the measurement precision and the like of the optical fiber current sensor are not affected, and effective detection of optical fibercurrent sensor faults can be completed under the conditions of low cost and easy implementation.

Fault diagnosis system and diagnosis method thereof for optical fiber current sensor

The invention discloses a photoelectric module reverse testing method and a photoelectric module fault diagnosis and discrimination method. The photoelectric module fault diagnosis and discriminationmethod comprises the steps of appearance inspection, basic photoelectric inspection and fault recurrence inspection, and as for a fault recurrence module, system testing, loss calculation and fault positioning analysis continue to be conducted; and as for fault non-recurrence module, temperature and humidity environment simulation test detecting is adopted, if a fault recurs, the system testing step is conducted, if the fault fails to recur, Allan variance calculation, detector return and phase modulation signal detection continue to be conducted, set threshold conditions are compared throughthe calculation results for performance evaluation, the module with poor performance serves as a test material, and the module with the good performance serves as a spare part. The photoelectric module fault diagnosis and discrimination method has the characteristic that fault diagnosis and discrimination are comprehensive, accurate and reliable.

Photoelectric module reverse testing method and photoelectric module fault diagnosis and discrimination method

The invention discloses a self-diagnosis alarm device and method of an optical path fault for an optical fiber current transformer. The device comprises a first coupler; a first port, a second port, athird port and a fourth port of the first coupler are connected with a light source, a first detector, a Y waveguide and a second detector correspondingly and respectively; the Y waveguide is furtherconnected to a third detector and a lambda/four wave plate through a second coupler; and the first detector, the second detector, and the third detector are connected to a modem module. Light entering the lambda/four wave plate through the second coupler is transformed into two beams of circularly polarized light and then the two beams of circularly polarized light enters a sensitive fiber directly; after the sensitive fiber transmits the light to a reflecting mirror, the light is reflected and then passes through the sensitive fiber and the lambda/four wave plate successively and then returns to the Y waveguide to form interference light; the interference light is transmitted to the modem module through the first coupler and the first detector successively; and the modem module is connected with the Y waveguide to realize closed-loop controlling.

Self-diagnosis alarm device and method of optical path fault for optical fiber current transformer

The invention discloses an apparatus and method for automatically testing a fiber current transformer. The apparatus comprises a standard source for providing a standard reference signal for a fiber current transformer, a data combining unit configured to collect a standard reference signal outputted by the standard source and a signal outputted by the fiber current transformer synchronously, carrying out combination and frame forming on the signal collected synchronously, and sending the processed signal to a communication and control unit, and a communication and control unit being configured to compare the received signal outputted by the fiber current transformer with the standard reference signal outputted by the standard source, carry out comparison with a preset threshold range based on the same proportion of the two signals, and determine the accuracy of a tested f8iber current transformer.

Apparatus and method for automatically testing fiber current transformer

The invention discloses an automatic testing device and method of phase delay of a quarter-wave plate for an all-fiber current transformer The device comprises a broad spectrum light source connectedwith a first coupler One output tail fiber of the first coupler is fused with one input tail fiber of a second coupler by a Mach-Zehnder interference reference phase arm; the other output tail fiberof the first coupler is in a 45-dgree-countershaft fusing relationship with one end of a to-be-tested quarter-wave plate; and the other end of the to-be-tested quarter-wave plate is in a 45-dgree-countershaft fusing relationship with the other input tail fiber of the second coupler The to-be-tested quarter-wave plate and a connected fusing point are arranged in space with the adjustable and stable temperature Two beams of light outputted by the first coupler enter the second coupler after different phase delays and make the interference in the second coupler; and the light under the interference is outputted to corresponding detectors respectively through two output tail fibers of the second coupler; and the detector transmits the light to a processor to calculate a phase delay of the quarter-wave plate under a current temperature

Automatic testing device and method of phase delay of quarter-wave plate for all-fiber current transformer

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Papers

Self-diagnosis alarm device and method of optical path fault for optical fiber current transformer

Apparatus and method for automatically testing fiber current transformer

Automatic testing device and method of phase delay of quarter-wave plate for all-fiber current transformer