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Zinc oxide nonlinear resistor characteristic equation and equation constant determination method

A technology of nonlinear resistance and characteristic equation, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc.

Inactive Publication Date: 2013-04-24
李永祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can express the volt-ampere characteristics of the product within the range of 2 to 3 orders of magnitude of current change, but the error is large. When the current range reaches 3 orders of magnitude, the error is usually more than 5%.
[0011] In addition to the above equations, many engineers, including the present inventors, have conducted studies of measuring the voltage values ​​of the product at multiple currents within the required current range, and then finding the fit of these current / voltage test values equations, but the obtained fitting equations are not practical due to large errors

Method used

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  • Zinc oxide nonlinear resistor characteristic equation and equation constant determination method
  • Zinc oxide nonlinear resistor characteristic equation and equation constant determination method
  • Zinc oxide nonlinear resistor characteristic equation and equation constant determination method

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Embodiment 1

[0091] It is required to measure the pulse volt-ampere characteristics of the following varistors: size 34×34mm, varistor voltage U 1mA =620.2V, maximum 8 / 20μs pulse current I max =40kA. Its method steps are:

[0092] 1) Determine the current value of the test point

[0093] for i max =40kA zinc oxide non-linear resistance, measure the voltage limiting characteristics within 400A-40kA, the actual current range selected in this example is a little wider than it, and start from the minimum value, roughly double the increase, a total of 9 measurement points.

[0094] Table 1 Test and calculation example of V-I characteristic equation

[0095]

[0096] 2) Measure the voltage value of each test current value 2: Conduct the test, record the current peak value of each test point and the voltage value at the time of the current peak point, see columns ① and ② in Table 1.

[0097] 3) Measure the voltage value of each test current value 2: Conduct the test, record the current p...

Embodiment 2

[0105] This embodiment is an example of applying the volt-ampere characteristic equation.

[0106] In the overvoltage protection system, the multi-level varistor protection system is widely used. For example, in the low-voltage industrial frequency power supply, the varistor in the 380V / 50Hz distribution box and the varistor at the input port of the power supply resistance, constitutes a two-level protection system. The volt-ampere characteristics of the protection components at all levels in the multi-level protection must cooperate to ensure that all components will not be overloaded within the entire design range of the surge current (voltage). In this embodiment, volt-ampere characteristics are used for calculation.

[0107] The specification of the first-stage varistor in the 220V / 50Hz power frequency power distribution box is 34×34mm, U N =620V, the maximum allowable current is 8 / 20-40kA. Specifications of the second level φ10mm, U N =560V, the maximum allowabl...

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Abstract

The invention discloses a zinc oxide nonlinear resistor characteristic equation and an equation constant determination method. The zinc oxide nonlinear resistor characteristic equation is expressed as follows: the equation for calculating voltage U according to current I is U=URIB, wherein B=1+A1+A2 lg I; or the equation for calculating the current I according to the voltage U is I=10x; or a normalizing volt-ampere characteristic equation is U=kR*U1mA*IB, wherein kR=UR / U1mA. The equation constant determination method includes five steps, namely determining a test current value, measuring a voltage value, calculating a resistance value of a test point, establishing an ohm ammeter characteristic equation and calculating a volt-ampere characteristic equation constant. By means of the equation constant determination method, the volt-ampere characteristic of nonlinear resistance can be expressed within the range of 2-4 orders of magnitudes of current changes, and the accuracy is equal to the test accuracy of current / voltage. Therefore, a useful tool is provided for production control of the components, development of new products and the design of a surge over voltage protection system.

Description

technical field [0001] The invention relates to the technical field of production of zinc oxide non-linear resistance elements, in particular to a voltage-ampere characteristic equation suitable for zinc oxide non-linear resistance elements and devices composed of such elements and a method for measuring constants in the voltage-ampere characteristic equation. Background technique [0002] The high degree of informatization of modern society and military technology has put forward higher and higher requirements for the safety and reliability of various electrical and electronic devices, which has promoted the rapid development of lightning protection and anti-overvoltage protection technologies and devices. ZnO varistor (MOV) at 10 -7 -6x10 3 A·㎝ -2 In such an extremely wide current range (spanning about 10-12 orders of magnitude), it has good voltage-limiting volt-ampere characteristics, and it can absorb large pulse energy. It has become the most widely used surge ove...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 张南法李永祥
Owner 李永祥
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