Meter with protection function and good heat dissipation effect

Abstract

The invention relates to a meter with a protection function and a good heat dissipation effect. The meter comprises a main body, a protective mirror, a pointer, a reflector, a rotator and two connecting ports. The protective mirror and the connecting ports are all disposed on the main body. The connecting ports are disposed under the protective mirror. The pointer and the reflector are disposed inthe main body. The reflector is fixed to the inner wall of the main body at a side away from the protective mirror. The bottom end of the pointer is connected with the inner wall of the main body through the rotator. The top end of the pointer is disposed between the protective mirror and the reflector. The main body is provided therein with a heat dissipation mechanism and a protection mechanism. The meter with a protection function and a good heat dissipation effect reduces the temperature inside the meter through the heat dissipation mechanism so as to be prevented from being damaged by over-high temperature. Additionally, the protection mechanism prevents the meter from being damaged by measured voltage exceeding a limit and reverse wire connection.

Description

technical field [0001] The invention relates to the field of smart grid measuring instruments, in particular to a measuring instrument with protection function and good heat dissipation effect. Background technique [0002] The whole composed of substations of various voltages and transmission and distribution lines in the power system is called the power network, referred to as the power grid. It includes three units of power transformation, power transmission, and power distribution. , The voltmeter is a kind of measuring instrument for the power grid. The existing pointer voltmeter is based on the principle of the magnetic effect of the current. The greater the current, the greater the magnetic force generated, which shows that the swing of the pointer on the voltmeter is greater. Large, there is a magnet and a wire coil in the voltmeter. After passing the current, the coil will generate a magnetic field. After the coil is energized, it will deflect under the action of th...

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Problems solved by technology

[0003] Due to the small overload capacity of the existing pointer voltmeter, it is necessary to pay attention to the selection of the polarity and the limit of the connection circuit when using it. When the polarity is reversed, the pointer will rotate in the opposite direction, causing damage to the internal parts. When the voltage value of the circuit exceeds the limit of the voltmeter, the voltmeter will burn out. Not only that, the existing pointer voltmeter has poor heat dissipation effect, and the high temperature will also affect the accuracy of the measurement data of the voltmeter.

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