CN209878882U - Insulation resistance tester for power equipment detection - Google Patents

Abstract

The utility model discloses an insulation resistance tester for detecting power equipment, which comprises a first light sensor, a second light sensor, a comparator, a signal amplifier, an A/D converter, a controller, a power module, a RC low-pass filter, a backlight adjusting circuit and a measuring module; the first light sensor and the second light sensor are both electrically connected with a comparator, the comparator is electrically connected with a signal amplifier, the signal amplifier is electrically connected with an A/D converter, the output end of the A/D converter is electrically connected with the input end of a controller, the output end of the controller is electrically connected with the input end of an RC low-pass filter, the output end of the RC low-pass filter is electrically connected with the input end of a backlight adjusting circuit, and the output end of the backlight adjusting circuit is electrically connected with a light-emitting element of a display screen; use the utility model discloses when carrying out insulation resistance's test outdoor and open-air electric power facility or electrical equipment, can not appear seeing the problem that shows content on the insulation resistance tester display screen unclear.

Description

Insulation resistance tester for power equipment detection

Technical Field

The utility model relates to a resistance detection instrument field specifically is an insulation resistance tester is used in power equipment detection.

Background

The insulation resistance tester is also called as a digital insulation resistance tester, a megohmmeter, an intelligent insulation resistance tester and the like, and is suitable for insulation test in maintenance, test and verification of various electrical equipment. The insulation resistance tester is suitable for insulation test in the maintenance, repair, test and verification of various electrical equipment. Since the insulation resistance test project is a conventional test, many electrical devices need to be subjected to insulation resistance tests, including outdoor and outdoor power facilities, electrical devices, and the like. When carrying out insulation resistance's test to outdoor and open-air electric power facility or electrical equipment, when outdoor and open-air illumination intensity is great, the problem that shows content on the display screen can't be seen clearly exists in current insulation resistance tester.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an insulation resistance tester is used in power equipment detection aims at improving when carrying out insulation resistance's test to outdoor and open-air electric power facility or electrical equipment, and the insulation resistance tester that outdoor and open-air illumination intensity are great leads to has the problem of not seeing clearly display content on the display screen.

In order to achieve the above object, the utility model provides a following technical scheme: an insulation resistance tester for detecting power equipment comprises a tester shell, wherein a display screen is arranged on the tester shell, and an electronic device is arranged in the tester shell and comprises a first light-sensitive sensor, a second light-sensitive sensor, a comparator, a signal amplifier, an A/D converter, a controller, a power supply module, an RC low-pass filter, a backlight adjusting circuit and a measuring module; the output ends of the first light sensor and the second light sensor are electrically connected with the input end of a comparator, the first light sensor is used for measuring the brightness outside the shell of the tester, the second light sensor is used for measuring the brightness of the display screen, the output end of the comparator is electrically connected with the input end of a signal amplifier, the output end of the signal amplifier is electrically connected with the input end of an A/D converter, the output end of the A/D converter is electrically connected with the input end of a controller, the output end of the controller is electrically connected with the input end of an RC low-pass filter, the output end of the RC low-pass filter is electrically connected with the input end of a backlight adjusting circuit, and the output end of the backlight adjusting circuit is electrically connected with a light-emitting element of the display screen; the power module is electrically connected with the controller, the controller is electrically connected with the measuring module, and the power module supplies power to the electronic device in the tester shell.

Furthermore, the electronic device further comprises a memory, wherein the memory is a nonvolatile memory, and the memory is electrically connected with the controller.

Furthermore, the measuring module comprises a DC/DC converter, an I/V converter and a divider, wherein the DC/DC converter is electrically connected with an E pole of the insulation resistance tester, an input end of the I/V converter is electrically connected with an L pole of the insulation resistance tester, and an output end of the I/V converter is electrically connected with the divider.

Further, the controller is a single chip microcomputer, and the single chip microcomputer is an AT89S51 single chip microcomputer.

Further, the controller is a single chip microcomputer, and the single chip microcomputer is of an STM32F103 type.

Further, the controller is a single chip microcomputer, and the single chip microcomputer is selected from the single chip microcomputers with the model of MSP430F 149.

Further, the first light sensor and the second light sensor are both light sensors with the model number of EM 30713.

Compared with the prior art, the beneficial effects of the utility model are that:

use the utility model discloses when carrying out insulation resistance's test to outdoor and open-air electric power facility or electrical equipment, the utility model discloses but external luminance of automated inspection and display screen luminance to according to the contrast value of external luminance and display screen luminance carries out the regulation of display screen luminance automatically, can not appear because of outdoor and open-air illumination intensity big problem that the content is shown on the high-visibility insulation resistance tester display screen.

Drawings

Fig. 1 is a block diagram of the insulation resistance tester for power equipment detection according to the present invention;

fig. 2 is the utility model relates to an electrical connection diagram between the measuring module of insulation resistance tester for power equipment detects and the E utmost point and the L utmost point of insulation resistance tester.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, an insulation resistance tester for detecting a power device includes a tester casing, a display screen is disposed on the tester casing, and an electronic device is disposed in the tester casing and includes a first light sensor, a second light sensor, a comparator, a signal amplifier, an a/D converter, a controller, a power module, an RC low-pass filter, a backlight adjusting circuit, and a measuring module; the output ends of the first light-sensitive sensor and the second light-sensitive sensor are electrically connected with the input end of the comparator, the first light-sensitive sensor is used for measuring the brightness outside the shell of the tester, the second light-sensitive sensor is used for measuring the brightness of the display screen, the output end of the comparator is electrically connected with the input end of the signal amplifier, the output end of the signal amplifier is electrically connected with the input end of the A/D converter, the output end of the A/D converter is electrically connected with the input end of the controller, the output end of the controller is electrically connected with the input end of the RC low-pass filter, the output end of the RC low-pass filter is electrically connected with the input end of the backlight adjusting circuit, and the output end of the backlight adjusting circuit is; the power module is electrically connected with the controller, the controller is electrically connected with the measuring module, and the power module supplies power to the electronic device in the tester shell.

The embodiment of the utility model provides an in, electron device still includes the memory, and nonvolatile memory is chooseed for use to the memory, and the memory links to each other with the controller electrical property, and nonvolatile memory is used for depositing executable code, variable and other transient state data of controller, still can be used to store measured data.

Please refer to fig. 2, in an embodiment of the present invention, the measuring module includes a DC/DC converter, an I/V converter, and a divider, the DC/DC converter is electrically connected to an E-pole of the insulation resistance tester, an input end of the I/V converter is electrically connected to an L-pole of the insulation resistance tester, an output end of the I/V converter is electrically connected to the divider, an E-pole and an L-pole of the insulation resistance tester are connected to a power device to be tested, a power module is used as a power source to generate a high direct voltage through the DC/DC converter, the high direct voltage is output from the E-pole through the power device to be tested to the L-pole, thereby generating a current from the E-pole to the L-pole, and the resistance value of the power device to be tested is calculated through the divider after the I/V converter conversion, and is displayed.

In the embodiment of the utility model, the controller is a single chip microcomputer, the type of the single chip microcomputer has three choices, firstly, the single chip microcomputer with the type of AT89S51 is selected, and the AT89S51 single chip microcomputer has simple structure and low cost, but has low speed; secondly, a singlechip with the model of STM32F103 is selected, so that the speed is high, the function is strong, and the programming is complex; thirdly, a single chip microcomputer with the model of MSP430F149 is selected, and the three single chip microcomputers are moderate in operation speed and programming difficulty, so that the power consumption is low; for long-time use requirements in the outdoors and in the wild, the controller is optimally selected to be a low-power-consumption MSP430F149 single-chip microcomputer.

The embodiment of the utility model provides an in, light sense sensor one and light sense sensor two all select the light sense sensor of model EM30713 for use, and its low price and low power dissipation more are adapted to the outdoor and the long-time use in field.

This use neotype working process and theory of operation: use the utility model discloses when carrying out insulation resistance measurement to electric power facility or power equipment, the utility model discloses a power key is opened, the outside luminance of a light sense sensor automatic measurement tester casing this moment, the luminance of two automatic measurement display screens of light sense sensor, light sense sensor one and light sense sensor two carry the measuring result to the comparator, the difference signal that obtains after carrying out the comparison to the signal of the luminance conversion that light sense sensor one and two transmissions of light sense sensor is compared is carried and is given the AD converter after signal amplifier enlargies, carry to the controller and handle after the AD conversion, the controller carries to the regulating circuit in a poor light after the RC low pass filter handles the handling result, regulating circuit in a poor light carries out the regulation of display screen luminance according to the light-emitting component of received data through the display screen.

Therefore, use the utility model discloses when carrying out insulation resistance's test to outdoor and open-air electric power facility or electrical equipment, the utility model discloses but external luminance of automated inspection and display screen luminance to automatically, carry out the regulation of display screen luminance according to the contrast value of external luminance and display screen luminance, when the difference that external circuit luminance surpassed display screen luminance is greater than the value of settlement, turn the display screen luminance bright, when the difference that external circuit luminance surpassed display screen luminance is less than the value of settlement, dim the display screen luminance, can not appear because of outdoor and open-air illumination intensity is big and see not clearly the problem of the display content on the insulation resistance tester display screen.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (7)

1. The utility model provides an electrical equipment detects uses insulation resistance tester, includes the tester casing, be provided with the display screen on the tester casing, be provided with electron device, its characterized in that in the tester casing: the electronic device comprises a first light-sensing sensor, a second light-sensing sensor, a comparator, a signal amplifier, an A/D converter, a controller, a power module, an RC low-pass filter, a backlight adjusting circuit and a measuring module; the output ends of the first light sensor and the second light sensor are electrically connected with the input end of a comparator, the first light sensor is used for measuring the brightness outside the shell of the tester, the second light sensor is used for measuring the brightness of the display screen, the output end of the comparator is electrically connected with the input end of a signal amplifier, the output end of the signal amplifier is electrically connected with the input end of an A/D converter, the output end of the A/D converter is electrically connected with the input end of a controller, the output end of the controller is electrically connected with the input end of an RC low-pass filter, the output end of the RC low-pass filter is electrically connected with the input end of a backlight adjusting circuit, and the output end of the backlight adjusting circuit is electrically connected with a light-emitting element of the display screen; the power module is electrically connected with the controller, the controller is electrically connected with the measuring module, and the power module supplies power to the electronic device in the tester shell.

2. The insulation resistance tester for detecting the electric power equipment according to claim 1, characterized in that: the electronic device further comprises a memory, wherein the memory is a nonvolatile memory, and the memory is electrically connected with the controller.

3. The insulation resistance tester for detecting the electric power equipment according to claim 2, characterized in that: the measuring module comprises a DC/DC converter, an I/V converter and a divider, wherein the DC/DC converter is electrically connected with an E pole of the insulation resistance tester, an input end of the I/V converter is electrically connected with an L pole of the insulation resistance tester, and an output end of the I/V converter is electrically connected with the divider.

4. The insulation resistance tester for electric power equipment detection according to any one of claims 1 to 3, characterized in that: the controller is a single chip microcomputer, and the single chip microcomputer is an AT89S51 single chip microcomputer.

5. The insulation resistance tester for electric power equipment detection according to any one of claims 1 to 3, characterized in that: the controller is a single chip microcomputer, and the single chip microcomputer is of an STM32F103 type.

6. The insulation resistance tester for electric power equipment detection according to any one of claims 1 to 3, characterized in that: the controller is a single chip microcomputer, and the single chip microcomputer is of an MSP430F149 model.

7. The insulation resistance tester for electric power equipment detection according to any one of claims 1 to 3, characterized in that: the first light sensor and the second light sensor are both light sensors with the model number of EM 30713.