The invention discloses an acquisition method and device of substation partial discharge live detection electromagnetic interference. The method includes the following steps that: coupling type electromagnetic interference signals of detected electromagnetic interferences are acquired through an ultrahigh-frequency antenna and a transient ground voltage capacitance sensor respectively, and conduction type electromagnetic interference signals of the detected electromagnetic interferences are acquired through a high-frequency Rogowski coil; and signal conditioning is performed on the acquired electromagnetic interferences, and the conditioned electromagnetic interferences are outputted. The acquisition device includes an electromagnetic interference signal sensitive unit and a signal conditioning unit; the electromagnetic interference signal sensitive unit includes the ultrahigh-frequency antenna and the transient ground voltage capacitance sensor which are used for acquiring the coupling type electromagnetic interference signals, and the high-frequency Rogowski coil which is used for detecting the conduction type electromagnetic interference signals; and the output ends of the ultrahigh-frequency antenna, the transient ground voltage capacitance sensor and the high-frequency Rogowski coil are connected with the signal conditioning unit respectively. The acquisition method and device of the invention can acquire and inhibit complex interference signals of which the frequency band is overlapped with that of partial discharge signals, and have the advantages of high detection accuracy, excellent detection sensitivity and convenient field detection.

Acquisition method and device of substation partial discharge live detection electromagnetic interference

The invention discloses a method for grading transformer station partial discharge live detection electromagnetic interference signals. The method performs classified statistic on various kinds of electromagnetic interference signals in various detection methods, uses the interference signal intensity and discrete degree thereof as the basis of interference grading, objectively and accurately grades the interference grades of the electromagnetic interference signals, quantitatively describes the electromagnetic interference signals, and provides a reference basis for a standardized interference test platform and establishment of a partial discharge detection device anti-interference performance evaluation system.

Method for grading transformer station partial discharge live detection electromagnetic interference signals

The invention discloses a cable oscillating wave local discharge fault positioning system. The cable oscillating wave local discharge fault positioning system comprises a high-frequency current sensor; the high-frequency current sensor inputs a sensed local discharge signal to a presignal wave detector; the presignal wave detector judges the signal, and controls a subsequent variable gain amplifier to select direct connection or an amplification factor; then, the signal is amplified by the variable gain amplifier and then enters a high-speed AD collection card for AD conversion; and data are transmitted to an upper computer for analysis, processing and display. According to the cable oscillating wave local discharge fault positioning system, by increasing the presignal wave detector and the variable gain amplifier, an amplitude of a reflection signal is significantly improved, and an AD collection effect is improved; and meanwhile, correlation operation is adopted for sampled data andwaveform matching is performed on a waveform characteristic algorithm, so that a matching effect is improved to the utmost extent, an identification effect on the sensed signal in two times is greatlyimproved, and the fault positioning precision is effectively improved.

Cable oscillating wave local discharge fault positioning system

The invention provides a measuring system and method of transient state electric current formed by GIS disconnecting switch operation. The system comprises a first detection device, a second detection device, an oscilloscope and a controller, wherein the first detection device detects and outputs a first transient state electric current signal which is less than or equal to preset frequency of a GIS busbar; the second detection device detects and outputs a second transient state electric current signal which is larger than the preset frequency of the GIS busbar; the oscilloscope is electrically connected to the first detection device and the second detection device and is used for outputting a first wave signal and a second wave signal; the controller is electrically connected to the output end of the oscilloscope and is used for determining the transient state electric current of the GIS busbar according to the first wave signal and the second wave signal. According to the measuring system and method of the transient state electric current formed by the GIS disconnecting switch operation, the first detection device is utilized to detect the transient state electric current with low frequency, the second detection device is utilized to detect the transient state electric current with high frequency, the transient state electric current of the GIS busbar is determined according to a full spectrum band response, and the accuracy of a detecting result is guaranteed.

Measuring system and method of transient state electric current formed by GIS disconnecting switch operation

The invention discloses a signal regulation and protection device for a partial discharge ultra-high-frequency sensor. The device includes an induced voltage protection module, a radio frequency module, an overvoltage pulse absorption module, a first capacitor, and a radio frequency interference suppression module. The induced voltage protection module removes induced voltage to guarantee the safety of backend personnel and an acquisition device. The overvoltage pulse absorption module reduces the high-voltage pulse signals of a partial discharge ultra-high-frequency sensor. The radio frequency interference suppression module suppresses the signal noise of the partial discharge ultra-high-frequency sensor, conditions and protects the whole circuit, makes the circuit no longer affected by noise, and greatly reduces the safety risks.

Signal regulation and protection device and method for partial discharge ultra-high-frequency sensor

The utility model discloses an electrified collection system who detects electromagnetic interference is put in office of transformer substation, including the sensitive unit (1) of electromagnetic interference signal and signal conditioning unit (2), electromagnetic interference signal sensitive unit (1) is including ultrahigh frequency antenna (11) and the transient state ground voltage capacitive sensor (12) who is used for gathering coupled mode electromagnetic interference signal, the high frequency luo shi coil (13) that is used for detecting conduction type electromagnetic interference signal, the output of ultrahigh frequency antenna (11), transient state ground voltage capacitive sensor (12), high frequency luo shi coil (13) links to each other with signal conditioning unit (2) respectively. The utility model has the advantages of can gather to restrain and put the complicated interfering signal that the signal has the band overlapping with the office, detection accuracy is high, detectivity is good, the witnessed inspections is convenient.

Ye Huisheng

Papers

Acquisition method and device of substation partial discharge live detection electromagnetic interference

Electrified collection system who detects electromagnetic interference is put in office of transformer substation