CN208092178U - A kind of insulation resistance measuring device - Google Patents

Abstract

The utility model discloses an insulation resistance measuring device, which comprises a measuring circuit, a wireless transmission module and a host computer. In the measuring circuit, a voltage dividing resistor is connected in series with a voltage sampling resistor and connected in parallel with the branch where the resistance to be measured is located. The voltage dividing resistor R and The voltage sampling resistor RV is used to measure the voltage value of the resistance to be measured, the current sampling resistor is used to measure the current value of the resistance to be measured, and the signal processing unit is used to process the measured voltage value and current value, and transmit them to the microcontroller to obtain the To test the insulation performance parameters of the resistor, the single-chip microcomputer turns on the power supply to provide a power reference value for the measurement circuit, and the single-chip microcomputer is used to compare the insulation performance parameters of the tested resistance with the pre-stored insulation parameter database. The utility model is used for measuring the insulation performance parameters of the resistance, and has high measurement accuracy and good stability. On this basis, the dynamic change curve of the insulation performance parameters of the tested product can be displayed, and the insulation state evaluation results of the tested product and the tested product can be displayed. possible defects in.

Description

A device for measuring insulation resistance

technical field

The utility model belongs to the application research field of insulation resistance measurement, in particular to an insulation resistance measurement device.

Background technique

Insulation resistance meter is a special instrument for measuring dielectric insulation performance parameters (insulation performance parameters include: insulation resistance, absorption ratio and polarization index). At present, digital insulation resistance meters are mostly used for measurement in high-voltage tests. The test personnel compare the measured results with the reference values of relevant regulations, and the value should not be lower than the value specified in the regulations; it can also be compared with the factory test and handover acceptance test. It can be compared with the previous routine test value; it can also be compared with the test value of the same type of test product. Finally, the test personnel judge whether the insulation condition of the tested product is good or not according to the relevant test regulations and personal experience.

This traditional measurement method involves a large number of human analysis processes, so its validity is largely affected by the subjective factors of the testers. If the test personnel are inexperienced, in poor condition, or the amount of data the test personnel have is insufficient, it may lead to inability to judge or even misjudgment. At the same time, the analysis and recording of test results is cumbersome, which reduces work efficiency.

Utility model content

The technical problem to be solved by the utility model is to provide an insulation resistance measuring device, which is used to measure the insulation performance parameters of the resistance, has high measurement accuracy and good stability, and can display the dynamic changes of the insulation performance parameters of the tested product on this basis The curve shows the evaluation results of the insulation state of the tested product and the possible defects in the tested product.

The technical solution adopted by the utility model to solve its technical problems is: provide a kind of insulation resistance measuring device, including measurement circuit, wireless transmission module and host computer, the measurement circuit is connected with the host computer through the wireless transmission module, and the measurement circuit mainly includes single-chip microcomputer, Power supply, signal processing unit, voltage dividing resistor R, voltage sampling resistor RV, current sampling resistor Ri, the current sampling resistor Ri is connected in series with the resistor Rx to be measured, and the voltage dividing resistor and the voltage sampling resistor are connected in parallel to the branch where the resistor to be measured is located. The voltage dividing resistor R and the voltage sampling resistor RV are used to measure the voltage value of the resistance to be measured, and the current sampling resistor is used to measure the current value of the resistance to be measured, and the current signal and voltage signal measured by the two branches pass through the signal processing unit at the same time; The signal processing unit is used to process the measured voltage and current values and transmit them to the single-chip microcomputer to obtain the insulation performance parameters of the tested resistance. The switch is used to start the single-chip microcomputer, and the single-chip microcomputer turns on the power supply to provide power reference values for the measurement circuit. The single-chip microcomputer is used to compare the insulation performance parameters of the tested resistance with the pre-stored insulation parameter database.

According to the above technical solution, the power supply is a high voltage direct current power supply.

According to the above technical solution, it also includes a display unit, the display unit is an electronic touch screen, connected with the host computer, and used to display the measurement result and the measurement time at the same time.

The beneficial effects produced by the utility model are: the insulation resistance measuring device of the utility model is used for measuring the insulation performance parameters of the resistance, the measurement accuracy is high and the stability is good, and the dynamic change curve of the insulation performance parameters of the tested product can be displayed on this basis , and display the evaluation results of the insulation state of the tested product and the possible defects in the tested product.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is the schematic diagram of the insulation resistance measuring circuit in the utility model embodiment;

Fig. 2 is a schematic diagram of the insulation resistance measurement and display unit in the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In the embodiment of the utility model, an insulation resistance measurement device is provided, which includes a measurement circuit, a wireless transmission module and a host computer. The measurement circuit is connected to the host computer through the wireless transmission module. The piezoresistor R, the voltage sampling resistor RV, the current sampling resistor Ri, the current sampling resistor Ri is connected in series with the resistance to be measured Rx, the voltage dividing resistor and the voltage sampling resistor are connected in parallel with the branch where the resistance to be measured is located, the voltage dividing resistor R and the voltage sampling Resistor RV is used to measure the voltage value of the resistance to be measured, and the current sampling resistor is used to measure the current value of the resistance to be measured. The current signal and voltage signal measured by the two branches pass through the signal processing unit at the same time; the signal processing unit is used to process all The measured voltage and current values are sent to the single-chip microcomputer to obtain the insulation performance parameters of the tested resistance. The switch is used to start the single-chip microcomputer. The insulation performance parameters are compared with the pre-stored insulation parameter database.

Further, the power supply is a high voltage direct current power supply.

Further, it also includes a display unit, the display unit is an electronic touch screen, connected with the host computer, and used to display the measurement result and the measurement time at the same time.

The utility model insulation resistance measuring device is used to measure the insulation performance parameters of the resistance, and has high measurement accuracy and good stability. On this basis, it can display the dynamic change curve of the insulation performance parameters of the tested product, and display the insulation state evaluation of the tested product Results and possible defects in the tested product.

Claims (3)

1. An insulation resistance measuring device, characterized in that, comprises a measurement circuit, a wireless transmission module and a host computer, the measurement circuit is connected with the host computer through a wireless transmission module, and the measurement circuit mainly includes a single-chip microcomputer, a power supply, a signal processing unit, and a voltage dividing resistor R, the voltage sampling resistor RV, the current sampling resistor Ri, the current sampling resistor Ri is connected in series with the resistor Rx to be measured, the voltage dividing resistor is connected in series with the voltage sampling resistor and connected in parallel with the branch where the resistor to be measured is located, the voltage dividing resistor R and the voltage sampling resistor RV It is used to measure the voltage value of the resistance to be measured. The current sampling resistance is used to measure the current value of the resistance to be measured. The current signal and voltage signal measured by the two branches pass through the signal processing unit at the same time; the signal processing unit is used to process the measured The voltage value and current value are sent to the single-chip microcomputer to obtain the insulation performance parameters of the tested resistance. The single-chip microcomputer connects the power supply to provide power reference values for the measurement circuit. The single-chip microcomputer is used to compare the insulation performance parameters of the tested resistance with the pre-stored insulation parameters. database for comparison. 2. The insulation resistance measuring device according to claim 1, wherein the power supply is a high-voltage direct current power supply. 3. The insulation resistance measuring device according to claim 1 or 2, further comprising a display unit, the display unit is an electronic touch screen connected to the host computer for displaying the measurement results and the measurement time at the same time.