Partial discharge comprehensive itinerant detector for high voltage electric power equipment
A high-voltage power equipment and partial discharge technology, applied in the field of high-voltage power transmission and transformation, can solve problems such as difficulty in discovering equipment defects and hidden dangers, reducing power grid operation reliability, etc., to achieve handheld, improve operating comfort, and improve work efficiency. Effect
Active Publication Date: 2013-09-04
STATE GRID CORP OF CHINA +2
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Problems solved by technology
Since inspections are mainly based on sensory means such as visual inspection, ear hearing, nose smelling, and touching by operation and maintenance personnel, it is difficult to find inherent defects and hidden dangers of equipment, which reduces the reliability of power grid operation
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Embodiment 1
[0052] In the selected signal conditioning module: the filter frequency band of the transient ground potential channel is 500kHz~10MHz, the envelope time constant of the envelope detection circuit is 1000ns; the filter frequency band of the ultra-high frequency electromagnetic wave channel is 400MHz~1GHz, corresponding to the envelope detection circuit The time constant of the envelope curve is 200ns, the non-contact ultrasonic channel is 30kHz~50kHz, and the contact ultrasonic channel is 20kHz~100kHz; the magnification of all channels is 100 times.
[0053] In the selected data acquisition channel, the data sampling frequency is 10MHz.
[0054] In the following, the partial discharge comprehensive inspection instrument of this embodiment will be further described in combination with the verification of the partial discharge detection performance of the partial discharge comprehensive inspection instrument through a pressurized test.
[0055] Figure 4 Shown is a schematic di...
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The invention discloses a partial discharge comprehensive itinerant detector for high voltage electric power equipment. The partial discharge comprehensive itinerant detector for the high voltage electric power equipment is characterized by comprising a host and a sensor group connected with the host, wherein the sensor group comprises a transient state ground potential sensor, an ultrahigh frequency electromagnetic wave sensor, a non-contacting ultrasonic sensor and a contacting ultrasonic sensor; the transient state ground potential sensor is used for detecting a current pulse signal on the shell of the electric power equipment; the ultrahigh frequency electromagnetic wave sensor is used for detecting an electromagnetic wave signal transmitted from the inside of the electric power equipment; the non-contacting ultrasonic sensor is used for detecting an ultrasonic wave signal transmitted from the inside of the electric power equipment; the contacting ultrasonic sensor is used for detecting shell vibration caused by the ultrasonic wave signal transmitted from the inside of the electric power equipment; and the transient state ground potential sensor, the ultrahigh frequency electromagnetic wave sensor, the non-contacting ultrasonic sensor and the contacting ultrasonic sensor are all connected with the host. According to the partial discharge comprehensive itinerant detector, a transformer, a composite apparatus (gas insulated switchgear) and a switch cabinet can be conveniently subjected to partial discharge electrification detection, and the partial discharge comprehensive itinerant detector for the high voltage electric power equipment has the outstanding advantages of convenience in carrying the instrument, as well as quickness and intellectualization in detection.
Description
technical field [0001] The invention relates to a comprehensive inspection instrument for partial discharge of high-voltage power equipment, which belongs to the technical field of high-voltage power transmission and transformation. Background technique [0002] The internal insulation defect of power equipment is the main cause of its failure. At present, the detection methods for insulation defects mainly include withstand voltage test and partial discharge detection. Considering that partial discharge detection has the outstanding advantages of simple operation, live detection, and early detection of insulation defects, partial discharge detection has become the main detection method for internal insulation defects of power equipment. [0003] The so-called partial discharge (Partial Discharge) is a kind of electrical discharge in the insulating medium, which means that under the action of an electric field, there are only some areas in the insulation system, such as meta...
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IPC IPC(8): G01R31/12
Inventor 周志成杨景刚刘洋贾勇勇
Owner STATE GRID CORP OF CHINA
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