Device, system and method for monitoring electrical load by measuring magnetic field

A technology of electrical load and magnetic field, applied in the direction of the size/direction of the magnetic field, can solve the problem of the magnetic flux being not easily saturated, and achieve the effect of good electrical load, convenient installation, and complex installation.

Active Publication Date: 2014-03-26
STATE GRID ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
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Problems solved by technology

[0003] Compared with the prior art, the present invention overcomes the need to connect the current transformer to the transmission line in the prior art to measure the current through the current transformer, disconnect the power line and cut off the power during installation, and easily saturate the magnetic flux, etc. Disadvantages, it can be installed without the need to cut off the power line, and the magnetic flux is not easy to saturate

Method used

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  • Device, system and method for monitoring electrical load by measuring magnetic field
  • Device, system and method for monitoring electrical load by measuring magnetic field
  • Device, system and method for monitoring electrical load by measuring magnetic field

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Embodiment Construction

[0028] The composition and working process of the electric load monitoring device of the present invention will be described in detail below. Alternating current produces an alternating electric field, and the alternating electric field produces a magnetic field, and a magnetic field that changes with the current is bound to be produced around the power line. By measuring the magnetic field around the power line, it can achieve approximately the same effect as measuring the current; and by comparing the magnetic field values ​​of the primary side and the secondary side of the transformer to monitor the load, it can achieve the same effect as the traditional method in this field by measuring the primary and secondary It has approximately the same technical effect of load monitoring of side current and apparent power.

[0029] The present invention judges the method for load imbalance by measuring the magnetic field as follows:

[0030] The apparent power correspondence between...

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Abstract

The invention provides a method, device and system for monitoring an electrical load. According to the invention, the magnetic field data of the primary side of a transformer is measured and the magnetic field data of the primary side is compared with the magnetic field data of a second side, so that electrical load monitoring is achieved. Compared with the prior art that a current transformer measures currents, the current transformer generally is connected onto an electric transmission line in a sleeveing manner, a power line needs to be disconnected and power is off during installation, the electrical load monitoring method, device and system have the advantages that the installation can be performed without powering off the power line, and magnetic flux is not easily saturated.

Description

technical field [0001] The invention relates to the field of electric equipment, and more particularly relates to a device, system and method for monitoring electric load by measuring a magnetic field. Background technique [0002] The existing electric energy metering system is generally composed of a metering transformer and an electric energy meter. The user's load is read by the electric energy meter, but the electric energy meter is easily damaged or refitted, so that the read load is not the actual load. Therefore, a device and method for load monitoring by comparing the apparent power of the primary side of the transformer with the apparent power read by the watt-hour meter appeared, but this requires the equipment to be divided into many types according to the load and voltage level of the transmission line. It is more complicated to implement and implement, and the installation method needs to destroy the original transmission line, so the power supply department wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02
Inventor 王维彬赵羡龙刘辉
Owner STATE GRID ELECTRIC POWER RES INST
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