Antenna receiver magnetic field shielding device and method

Abstract

The invention relates to an antenna receiver magnetic field shielding device and method. The method comprises steps of firstly measuring the size and direction of a magnetic field at an antenna receiver through a magnetic field measurement probe disposed under an antenna receiver, transmitting the magnetic field to a control device, and enabling the control device to analyze the direction of the magnetic field and determine the direction to which a multi-turn coil should face; analyzing the size of the magnetic field, determining the current to be loaded by a multi-turn coil, further calculating to obtain a transformation ratio corresponding to the transformer, and determining the position where the transformer tap joint should be located; outputting a coil position signal to a coil rotating plane, and adjusting the orientation of the coil; and transmitting the tap adjusting signal to a tap adjustable transformer, and adjusting the position of the tap. The method is advantaged in thata voltage outputted by an alternating current power supply is converted into the current through the transformer, the current is loaded to the multi-turn coil, the magnetic field generated at an antenna receiver and a generated interference magnetic field are superposed and then offset, a magnetic field shielding function at the antenna receiver is realized, the electromagnetic environment of theantenna receiver is improved, and the antenna receiver is enabled not to be interfered in work.

Description

technical field [0001] The invention relates to a magnetic field shielding method, in particular to a magnetic field shielding device and method for an antenna receiver. Background technique [0002] With the development of the power grid today tends to be intelligent, many automated equipment has been put into the power system, which has improved the reliability, stability and other aspects of the power system. The substation is an important part of the power system, and there are many automatic devices for various protection, monitoring and recording in the substation. Among them, the fault recording system and the accident sequence recording system have very high requirements on time accuracy. Only with high-precision time can the accident be accurately recorded, which puts forward higher requirements for the high-precision timing of the positioning device. However, in the substation, all kinds of electromagnetic interference will affect the receiver of the positioning ...

AI Technical Summary

Problems solved by technology

In order to reduce the electromagnetic interference generated by the high-voltage equipment in the substation to the antenna receiver, the mainstream method of sealing and shielding is no longer applicable, and a new method of shielding electromagnetic interference should be sought

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