Double-principle cable partial discharge sensor and data fusion method thereof
A partial discharge and data fusion technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of poor anti-interference ability, narrow bandwidth, installation, low-frequency signal extraction, etc., to improve performance, effectively extract, and enhance signals. the effect of strength
Active Publication Date: 2019-01-29
STATE GRID ANHUI ELECTRIC POWER CO LTD HUAINAN POWER SUPPLY CO +2
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Problems solved by technology
[0008] 1) The bandwidth is relatively narrow, and the high-frequency sensitivity is insufficient. Generally, the detection sensitivity of inductive sensors is above 10pC;
[0009] 2) Based on electromagnetic coupling, the anti-interference ability is poor, and it is relatively easy to be affected by interference such as white noise and aperiodic pulse. This is the most important reason for the high false alarm rate of existing partial discharge detection, which seriously restricts the application effect
[0013] In practical applications, the main problem restricting capacitive sensors is the inconvenience of installation
Existing capacitive sensors generally cut the outer sheath of the cable, or are installed in a pre-embedded manner, which is difficult to use in existing lines
A few researchers have proposed capacitive sensors without destroying the outer sheath, but such sensors have relatively poor low-frequency response, and the sensor monitoring range is limited in field applications
But in general, due to the advantages of capacitive sensors in core performance, capacitive sensors are the current research hotspots, but the problems of installation and low-frequency signal extraction still need to be solved technically.
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[0058] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0059] see Figure 1 to Figure 3 , the embodiment of the present invention includes:
[0060] A dual-principle cable partial discharge sensor mainly includes a capacitive sensor 2 and an inductive sensor 3 sleeved outside a cable shielding layer 11, and the inductive sensor 3 is arranged outside the capacitive sensor 2. In the following description, the dual-principle cable partial discharge sensor is referred to as the dual-principle sensor for short. The structural design and principle circuit of the two sensors are described in detail below:
[0061] combine figure 2 , the capacitive sensor 2 includes an inner polar plate 21 , a waterproof ...
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Abstract
The invention discloses a double-principle cable partial discharge sensor, mainly comprising a capacitive sensor and an inductive sensor which are sleeved outside a cable shielding layer, wherein thecapacitive sensor comprises an inner layer plate, a waterproof layer and an outer layer plate in order from inside to outside, and the inner layer plate is wrapped on the outer sheath of the cable; the inductive sensor comprises an open circular coil bobbin, a coil uniformly wound on the coil bobbin, and a metal shell; the coil bobbin is made of a material with high magnetic permeability, the metal shell is disposed outside the coil bobbin; and the inductive sensor is disposed outside the capacitive sensor. A data fusion method of the sensor is also disclosed, which fully utilizes the characteristics of the dual-principle sensor with sub-band complementation and white noise uncorrelated, and combines the low-frequency / high-frequency performance of sensors with different principle to betterrestore the waveform with a frequency division weighted algorithm, thereby achieving efficient extraction of the partial discharge signal of the cable.
Description
technical field [0001] The invention relates to the field of power system automation, in particular to a dual-principle cable partial discharge sensor and a data fusion method thereof. Background technique [0002] The influence of electricity, heat and stress during long-term operation of cables, as well as improper operations during construction and installation, may cause local insulation defects in the cable body and accessories, resulting in partial discharge (referred to as partial discharge). As partial discharges persist, localized defects in insulation will eventually develop into global breakdowns. [0003] In the current power production, the partial discharge detection (monitoring) of cables generally adopts the regular inspection method, but the regular inspection method requires a power outage. There is a difference between the offline and the running state of the cable, which affects the detection accuracy, and the cable state also changes during the regular i...
Claims
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Login to View More IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor唐旭明夏炜郭宁明王吉文单晓锋韩先国马杰张明帅史梦迪
OwnerSTATE GRID ANHUI ELECTRIC POWER CO LTD HUAINAN POWER SUPPLY CO