A device and method for measuring current in a power system
A current measurement device and power system technology, which is applied in the direction of measurement devices, voltage/current isolation, and current-only measurement, can solve the problems of unable to meet the range requirements of current measurement, narrow measurement frequency band, unstable current level, etc.
Active Publication Date: 2021-03-19
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
[0004] However, the application scenarios of the current power system are complex and diverse, and the level of existing current is not stable, especially in the power system with heavy load, some wires only have a small current of tens of amperes, while some wires may There are tens of thousands of amperes of short-circuit current or lightning current and other large currents
Due to the shortcomings of electromagnetic current transformers such as high current, easy saturation of the iron core, and narrow measurement frequency band, the use of existing technologies for current measurement cannot meet the range requirements of current measurement of wires in different application scenarios in power systems.
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[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0034] An embodiment of the present invention provides a power system current measuring device, please refer to figure 1 , figure 1 It is a structural schematic diagram of a preferred embodiment of a power system current measurement device provided by the present invention. Specifically, the device includes a housing 1, a magnetic sensing module 2, a digital-analog The conversion module 3 and the control module 4, the magnetic sensor module 2 includes N uniaxial m...
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The invention discloses a power system current measuring device and method. The device includes a shell, a magnetic sensor module, a digital-to-analogue conversion module and a control module, whereina biaxial magnetic sensor chip is used for measuring first and second magnetic field vectors of a to-be-measured wire, a homotaxial magnetic sensor chip is used for measuring third magnetic field vectors of the to-be-measured wire, and the control module is used for calculating a first range current according to the first magnetic field vectors, the second magnetic field vectors and the third magnetic field vectors measured by the homotaxial magnetic sensor chip with a first range, and judging whether or not the first range current exceeds a current threshold; if the first range current exceeds the preset current threshold, a second range current is calculated according to the first magnetic field vectors, the second magnetic field vectors and the third magnetic field vectors measured bythe homotaxial magnetic sensor chip with a second range. The power system current measuring device and method can meet the requirements of current measurement ranges in different application scenarios.
Description
technical field [0001] The invention relates to the technical field of current measurement, in particular to a power system current measurement device and method. Background technique [0002] In the power system, it is often necessary to measure parameters such as current in the power grid to analyze the operating status of the power system in real time. At present, due to the advantages of simple measurement principle and mature technology, electromagnetic current transformers are widely used in the current measurement of wires in power systems. [0003] In the prior art, electromagnetic current transformers are often used to detect the magnetic field vectors in the X-axis and Y-axis directions generated by the current, and then measure the current of the wire. [0004] However, the application scenarios of the current power system are complex and diverse, and the level of existing current is not stable, especially in the power system with heavy load, some wires only have...
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IPC IPC(8): G01R19/00G01R15/08G01R15/20
CPCG01R15/08G01R15/20G01R19/0092
Inventor 许爱东李鹏李立浧王志明吴质冰
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD