Large-diameter clamp-type AC micro-current sensor device
A sensor device and micro-current technology, applied in the direction of measuring devices, measuring current/voltage, instruments, etc., can solve the problems of not meeting the error range of the measured dielectric loss value, small leakage current signal, etc., and achieve easy mastery and high accuracy , easy-to-achieve effects
Active Publication Date: 2015-08-19
ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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Problems solved by technology
This is because the leakage current signal of high-voltage capacitive equipment is very small, some of which are only on the order of microamperes, and the existing clamp-on AC current sensors all adopt a single-core structure. , due to the influence of its peripheral distributed capacitance and distributed inductance, the measured amplitude error and angle error cannot meet the requirements of the error range of the measured dielectric loss value
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[0032] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0033] Such as figure 1 The shown large-diameter pincer AC microcurrent sensor device includes a pincer core 1, and the specific structure of the pincer core 1 is as follows: figure 2 As shown, the upper outside of the clamp core 1 is provided with a first clamp sensor 2, and the lower outside of the clamp core 1 is provided with a second clamp sensor 3, and the outer diameter of the second clamp sensor 3 is larger than or Equal to the first clamp sensor 2, the outside of the second clamp sensor 3 is provided with a clamp magnetic core shield 4, and the clamp magnetic core shield 4 connects the clamp magnetic core 1, the first clamp sensor 2 and the second clamp The outer side of the clamp-shaped magnetic core shield 4 is provided with an electromagnetic shielding shell 5, and the electromagnetic shielding shell 5 shields the clamp-shaped magn...
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The invention relates to a large-aperture forcipate micro-current sensor device, which comprises a forcipate magnetic core, wherein a first forcipate sensor is sleeved on the upper outer side of the forcipate magnetic core, a second forcipate sensor is sleeved on the lower outer side of the forcipate magnetic core, the outer diameter of the second forcipate sensor is greater than or equal to the first forcipate sensor, the outer side of the second forcipate sensor is provided with a forcipate magnetic core shielding body, the forcipate magnetic core shielding body shields the forcipate magnetic core, the first forcipate sensor and the second forcipate sensor, the outer side of the forcipate magnetic core shielding body is provided with an electromagnetic shielding shell, the electromagnetic shielding shell shields the forcipate magnetic core shielding body, the forcipate magnetic core shielding body and the electromagnetic shielding shell are respectively provided with a hole which is communicated with an axial hole of the forcipate magnetic core, the inner side of the forcipate magnetic core shielding body is provided with a signal amplifier, the input end of the signal amplifier is electrically connected with the first forcipate sensor, and the output end of the signal amplifier is electrically connected with the second forcipate sensor. The large-aperture forcipate micro-current sensor device has characteristics of high precision, wide measurement range and small influence from external environment.
Description
technical field [0001] The invention relates to a device for sampling leakage current signals of capacitive equipment in a power system; in particular, it relates to a large-diameter pincer-type AC micro-current sensor device for sampling micro-AC current signals when the grounding down-conductor at the end screen of the capacitive equipment cannot be opened. Background technique [0002] There are a large number of capacitive devices in the power system, such as current transformers, voltage transformers, etc., which occupy a considerable proportion in the power grid. Their insulation performance plays a vital role in the safe and stable operation of the power grid. The medium The loss tangent value (tanδ) is an important parameter reflecting its insulation performance. [0003] The detection of the dielectric loss tangent (tanδ) first requires the extraction of the leakage current signal of the capacitive equipment. At present, the leakage current signal of the capacitive ...
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IPC IPC(8): G01R19/28G01R31/02
Inventor 方丽华杨晟张志强刘均裕李伟烽何炳锋缪东飞潘涛戴兵窦佳王亮
Owner ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID