The invention relates to an impedance frequency response method for measuring the corrosion state of a grounding network of a transformer substation. The method comprises the following steps of: 1, calculating impedance frequency response curves between grounding down leads at different positions and under different corrosion states of the grounding network of the transformer substation by numerical simulation and a corresponding frequency point impedance numerical list; 2, actually measuring and drawing the impedance frequency response curves at the different positions of the grounding network; 3, querying the impedance frequency response curve which is at the same position of the grounding network of the transformer substation and is measured every year; and 4, comparing original input data which are obtained in the step 1, the impedance frequency response curves which are at the different positions and are obtained in the step 2, and the impedance frequency response curve which is at the same position, is measured every year and is obtained in the step 3, estimating the corrosion states of the grounding network, and giving the corrosion level of the grounding network and the equivalent diameter of a grounding body. The method has the advantages that: excavation and soil sampling of the grounding network are not required; the working load of corrosion measurement of the grounding network of the transformer substation is reduced; the cycle of the corrosion measurement of the grounding network of the transformer substation is shortened; and the judgment accuracy of the corrosion level of the grounding network of the transformer substation is improved.

Impedance frequency response method for measuring corrosion state of grounding network of transformer substation

Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid

The invention relates to a transformer substation grounding grid corrosion detection system and method based on earth's surface magnetic induction intensity. The system comprises a current injection apparatus connected to any accessible node of the grounding grid and injecting a sinusoidal AC different from a power frequency; and the AC is injected through any accessible node of the grounding grid and used for exciting an alternating magnetic field. The system also comprises a signal measurement apparatus position right above a measurement conductor and used for measuring potential distribution on the earth surface right above the conductor; a data acquisition apparatus connected to the signal measurement apparatus and used for receiving potential signals transmitted by the signal measurement apparatus and carrying out filtering and amplification on the potential signals; and a signal analysis and display terminal connected to the data acquisition apparatus to receive data and signals transmitted by the data acquisition apparatus. Compared with the prior art, the transformer substation grounding grid corrosion detection system and method based on the earth's surface magnetic induction intensity of the invention have advantages of guaranteeing safe and reliable operation of transformer substations, etc.

A transformer substation grounding grid corrosion detection system and method based on earth's surface magnetic induction intensity

The invention discloses an FPGA (Field Programmable Gate Array)-based alternating current electromagnetic field crack detector which comprises an FPGA digital circuit, a DDS (Digital Display Scope) exciting source, a power amplification circuit, an exciting coil, a detection sensor, a preamplifier, a signal conditioning board, an AD (Analog-digital) conversion circuit, a key circuit and a communication circuit. An FPGA is used as a control chip of an alternating current electromagnetic field detection system to design an exciting source module with an adjustable frequency and a phase and design an alternating current electromagnetic field detection sensor, a signal conditioning circuit, the AD conversion circuit and the communication circuit. The FPGA-based alternating current electromagnetic field crack detector has the technical effects that through the design of an FPGA chip control-based alternating current electromagnetic field detection digital circuit system, control over an peripheral hardware circuit module by the alternating current electromagnetic field crack detector is realized, the shortcomings of narrow measurement range, low measurement precision and single measurement of the current detector are overcome, and the flexibility and the intelligence of detection are improved; the FPGA-based alternating current electromagnetic field crack detector can be applied to overhead work and a complicated detected workpiece.

Alternating current electromagnetic field detector

The invention relates to a remote control detecting device for the corrosion state of a grounding grid horizontal voltage-sharing conductor of a substation, for detecting the corrosion state of a grounding grid under the condition of power-on operation of the substation. The device mainly solves the problems of large workload, low accuracy, complex operation and the like in the current method for detecting the broken point and the corrosion state of the grounding grid. The remote control detecting device for the corrosion state of the horizontal voltage-sharing conductor of the substation grounding grid comprises an underground grounding grid horizontal voltage-sharing conductor, and further comprises a remote control unmanned aerial vehicle, a signal transmitting system, a receiving system and a background terminal system, wherein the receiving system is composed of a magnetic field detecting unit and a position coordinate and data wireless transmission unit which are arranged on the remote control unmanned aerial vehicle; and the background terminal system is composed of a wireless receiving unit, an upper computer and software installed in the upper computer.

Remote control detecting device for corrosion state of grounding grid horizontal voltage-sharing conductor of substation

A grounding grid defect diagnosis method of a transformer substation belongs to the field of electric power technology for solving the problems in grounding grid defect diagnosis. The technical proposal of the method comprises the following steps of: firstly, connecting different-frequency sine wave excitation sources between two lower conductors of the grounding grid of a transformer substation,directly injecting excitation current, simultaneously converting a magnetic induction intensity signal excited by the injected current on the ground into an induced voltage signal by a detection coil,measuring the distribution of the magnetic induction intensity on the ground and simulating the ground magnetic induction intensity of the grounding grid under normal condition; then comparing the measurement result with the simulation result and diagnosing the specific position and the degree of corrosive thinning or rupture defects of the grounding grid. The invention has convenient operation and can rapidly and accurately diagnose conductor defect in the grounding grid under the normal operation condition of the transformer substation to meet the requirement of actual field measurement anddiagnosis.

Substation grounding net defect diagnostic method and apparatus

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Substation grounding net defect diagnostic method and apparatus