Simple measurement of high voltage in electrostatic spraying equipment

Simple measurement of high voltage in electrostatic spraying equipment

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I. Overview

It is well known that electrostatic painting equipment has been widely used in the production of packaging containers. However, the measurement problem of hundreds of thousands of volts generated by electrostatic generators has become a difficult problem for various manufacturers. Many manufacturers feel helpless about the quantitative measurement of high pressure. The high-voltage test instruments currently on the market are not only bulky, expensive, but also inconvenient to carry. The factory only relies on the soil method to roughly detect the "yes" or "none" of the high pressure, and it is impossible to carry out quantitative measurement, making the quality of the electrostatic painting difficult to guarantee.

We have designed and manufactured a "high-voltage electrostatic tester" through several experiments. The instrument has simple structure, low price, convenient and safe use, high measurement precision, and can be matched with a general multimeter, and has basically nothing to do with environmental conditions. The operator can easily read out the actual value of the high pressure.

Second, the basic principles

We know that the relationship between voltage, current and load resistance in a circuit can be expressed by ohmic law:

I=U/R

This law also applies to sub-high voltage circuits.

Set: The high voltage generator U generated by the high voltage generator is 150KV, and the load flow I is 50KA with a spray gun. According to Ohm's law:

R=U/I=150KV/50KV=3000MΩ

Therefore, the circuit shown in Figure 1 can be used to measure the high voltage.

Among them: A is 50KA meter head, R is high voltage synthetic resistor.

When measuring with a normal multimeter, it can be calculated by the following method.

Use the multimeter DC voltage file, as shown in Figure 2.

Set: The full scale range is U, the multimeter's DC voltage range sensitivity is RoQ/V, and the most suitable range is U. According to Ohm's law and partial pressure principle:

R / (R. U.) = (UU.) / U.

Simplified: U = R / R. +U.

In general, we choose the file U. It is very different from the actual measured voltage, namely: U>>U. Therefore, the above formula can be simplified as:

U=R/R.

When using a MF30 multimeter with a sensitivity of 20KΩ/V, and R is 3000MΩ, the maximum range is:

U=3000/20=150KV

In fact, we need to measure the voltage is about 100KV. At this time, the measured operating current of the device is about 33.3KA, which is close to the actual situation and can truly reflect the actual value.

Third, problems should be paid attention to in production and use

1. In general, a single 3000 MΩ high voltage synthesis resistor is difficult to find. Multiple small value resistors can be used in series, but the resistor power must be carefully calculated to avoid burning high voltage synthesis resistors.

2. The high-voltage synthetic resistor should be sealed in a glass rod or plexiglass rod with a length of more than 2.1 meters to strengthen the insulation and ensure personal safety.

3. When using, carefully check whether the cable is intact, the polarity is correct and the paint is turned off, so that the spray booth is well ventilated to avoid fire.

4. The instrument can be calibrated using the ZC48 Ultra High Insulation Meter to ensure accuracy.

Fourth, the actual use

Through more than one year of actual use in the factory, the instrument can easily and quickly detect high-voltage generators below the process requirements (80-100KV or less). Accurately judge the cause of poor spray quality - timely treatment to ensure the quality of 200 liter oil drum painting. I think it has the value of promoting use.

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