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Oil-filled ac-dc difference calculable resistor

A technology of AC-DC difference and resistance, which is applied in the direction of non-adjustable metal resistors, resistors, resistor components, etc., can solve the problems of large load effect, value drift, and short resistance wire length, etc., to achieve good heat dissipation, Reduce the effect of changes

Active Publication Date: 2015-11-11
BEIJING DONGFANG MEASUREMENT & TEST INST
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Problems solved by technology

[0004] In the prior art, several types of "AC-DC difference computable resistance" have been realized, among which, the coaxial AC-DC difference computable resistance made by placing the linear resistance wire at the center of the metal cylinder is The most regular approach, because the electromagnetic field in this case can be accurately calculated, but the resistance wire length of this structure is short, so the load effect is large, and the value keeps drifting after power-on, that is, the impact of the load effect is significant, becoming coaxial The Main Technical Problems of Calculating Resistor with Shaped AC-DC Difference

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Embodiment Construction

[0024] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] The design concept of the oil-filled AC-DC differential resistance of the present invention is to fill the cavity of the coaxial AC-DC differential resistance with liquid oil with insulation and heat dissipation functions to dissipate the heat generated by the resistance wire after electrification. It can also be placed in a temperature-controlled cylinder that maintains a constant temperature to keep the temperature of the oil constant, thereby effectively reducing the impact of environmental temperature changes.

[0026] An oil-filled AC-DC differential resistor, the AC-DC differential resistor is a coaxial AC-DC differential resistor, comprising a metal cylinder with a cylindrical cavity, and a linear resistance wire placed in a metal cylinder On the central axis in the length direction of the cylinder cavity, there is liquid oil in t...

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Abstract

The invention provides an oil-filled ac-dc difference calculable resistor, and the influence of a load effect of a coaxial ac-dc difference calculable resistor is substantially reduced. The oil-filled ac-dc difference calculable resistor provided by the invention is the coaxial ac-dc difference calculable resistor and comprises a metal cylinder, wherein the metal cylinder is provided with a cylindrical cavity, a linear resistance wire is arranged on the central axis of the length direction of the metal cylinder cavity, liquid oil is arranged in the metal cylinder cavity and serves as an insulation cooling medium of the resistance wire, and thus, the stability of the ac-de difference calculable resistor can be improved.

Description

technical field [0001] The invention relates to the technical field of electrical measurement, in particular to an oil-filled AC / DC difference calculable resistance. Background technique [0002] Resistance is one of the most common electrical components. High-accuracy resistance is not only the core component of high-precision instruments, but also widely used in many scientific research occasions. In most practical work, resistance devices are mostly used for AC and high-frequency circuit. Due to the parasitic inductance and parasitic capacitance in the resistance device, as well as the skin effect of the wires in the AC state, the proximity effect between the wires, and the surrounding dielectric loss, the resistance has frequency characteristics. The frequency changes, so that the real part of the impedance of the resistance element in the AC circuit is not equal to the resistance value in the DC state. Therefore, the value of the AC resistance cannot simply use the res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C3/00H01C1/084H01C1/028
Inventor 黄晓钉佟亚珍蔡建臻宋佳赟张明志张书锋李振
Owner BEIJING DONGFANG MEASUREMENT & TEST INST
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