CN205427117U - Comprehensive testing arrangement of insulator null value - Google Patents

Abstract

The utility model discloses an insulator zero-value comprehensive testing device, which belongs to the field of measuring instruments, and comprises an insulating shell, a main control chip arranged in the insulating shell, a high-frequency transformer circuit, a sampling resistance circuit, and an A/D converter , liquid crystal display module and voice broadcast module; the output end of the high-frequency transformer circuit is equipped with telescopic contacts; the control signal output end of the main control chip is connected to the high-frequency transformer circuit, and the high-frequency transformer circuit is The head is connected to the input end of the insulator under test, the output end of the insulator under test is connected to the input end of the main control chip through the sampling resistance circuit, and the video and audio signal output end of the main control chip is connected to the liquid crystal display module and the The voice broadcast module; the telescopic contact is composed of a telescopic insulating rod and a conductive probe tip connected to the end of the telescopic insulating rod. The utility model has the advantages that it is suitable for insulators with various disc diameters, is convenient to use, and improves the safety and work efficiency of the testing process.

Description

A comprehensive testing device for insulator zero value

technical field

The utility model belongs to the field of measuring instruments, in particular to an insulator zero-value comprehensive test device, which is suitable for insulators with various disc diameters.

Background technique

At present, the zero and low value test method of porcelain insulators on transmission lines is to use a pistol tester, which has the following problems: (1) The test results are displayed by dial pointers, and the numerical results are not accurate, and cannot accurately reflect the insulator resistance; (2) During the test, there is no prompt for the insulator whose insulation resistance meets the requirements. When the contact between the contact and the steel cap of the insulator is not in good contact and the test result is not obtained, the instrument also does not have any prompt, which is prone to missed testing; (3) The operator needs to hold the test by hand The instrument handle prevents the instrument from falling, and it is inconvenient to carry. It is necessary to pull the "trigger" with fingers during the test, and it is necessary to change the position on the insulator string during the test. However, the existing equipment is not conducive to testing while moving on the insulator string. There is a large safety risk, and for the insulator strings at different positions, far and near, high and low, the labor intensity of the operator is high, and the measurement is time-consuming and laborious.

Utility model content

The technical problem to be solved by the utility model is to provide a convenient, efficient, accurate and stable insulator zero value comprehensive testing device suitable for insulators with different disc diameters.

The utility model adopts the following technical solutions:

An insulator zero-value comprehensive testing device, which includes an insulating casing, a main control chip arranged in the insulating casing, a high-frequency transformer circuit, a sampling resistance circuit, an A/D converter, a liquid crystal display module, and a voice broadcast module; The output end of the high-frequency transformer circuit is provided with telescopic contacts; the control signal output end of the main control chip is connected to the high-frequency transformer circuit, and the high-frequency transformer circuit is connected to the measured The input terminal of the insulator, the output terminal of the tested insulator is connected to the input terminal of the sampling resistance circuit, the output terminal of the sampling resistance circuit is connected to the input terminal of the main control chip, and the video and audio signal output terminal of the main control chip The liquid crystal display module and voice broadcast module are connected through the A/D converter; one side of the insulating shell is provided with an adjustable elastic fixing belt; the telescopic contact is connected by a telescopic insulating rod and the Consists of a conductive probe tip at the end of a telescoping insulating rod.

Further, the high-frequency transformer circuit includes NPN transistors Q1~Q2, diodes D1~D2, capacitor C1, and high-frequency transformer T1; the control signal output terminals of the main control chip are respectively connected to NPN transistors Q1~Q2 the base of the diode D1; the anode of the diode D1 is connected to the emitter of the NPN transistor Q1, and its cathode is connected to the collector of the NPN transistor Q1; the anode of the diode D2 is connected to the emitter of the NPN transistor Q2, and its cathode is connected to the NPN transistor. The collector of the transistor Q2; the emitter of the NPN transistor Q1 is connected to the collector of the NPN transistor Q2; one end of the primary side of the high-frequency transformer T1 is connected to the negative pole of the diode D2 through a capacitor C1, and the primary side of the high-frequency transformer T1 is The other end of the diode D2 is connected to the positive pole of the diode D2, and the secondary side of the high-frequency transformer T1 is connected to the input end of the insulator under test.

Further, the sampling resistor circuit includes resistors R1~R3 and a dual operational amplifier LM358; the output terminals of the measured insulator are respectively connected to the negative and positive poles of the dual operational amplifier LM358 via resistors R1 and R2, and the resistor R3 It is connected in parallel between the negative pole and the output terminal of the dual operational amplifier LM358, and the output terminal of the dual operational amplifier LM358 is connected to the input terminal of the A/D converter.

Further, the model of the liquid crystal display module is JLX2402A.

Further, the model of the voice broadcast module is WT588D.

Further, the main control chip is a PIC16F series single-chip microcomputer.

The beneficial effects of the utility model are: the utility model uses a liquid crystal display module to display test results, which is more accurate than pointer display, stable in performance, and good in data repeatability; prompts are given to insulators whose insulation resistance meets the requirements during the test, that is, when touched When the contact between the head and the steel cap of the insulator is poor and the result is not measured, the voice broadcast module in the utility model will send out an alarm prompt, so that it is not easy to miss the test; the contact in the utility model adopts a telescopic design, which is suitable for various The disk diameter insulator is not only convenient to use without replacing the contacts, but also improves the test efficiency, improves the safety of the test process, improves the working efficiency of the insulator zero value detection, and increases the scope of application.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the circuit schematic diagram of sampling resistance circuit in the utility model

Among them, 1 main control chip, 2 high-frequency transformer circuit, 3 sampling resistance circuit, 4 A/D converter, 5 liquid crystal display module, 6 voice broadcast module, 7 tested insulator, 8 retractable contact.

detailed description

Below in conjunction with accompanying drawing 1～2, the utility model is further described.

Referring to Figures 1-2: the embodiment includes an insulating casing, a main control chip 1 arranged in the insulating casing, a high-frequency transformer circuit 2, a sampling resistor circuit 3, an A/D converter 4, a liquid crystal display module 5 and a voice broadcast module 6. The output end of the high-frequency transformer circuit 2 is provided with telescopic contacts 8; the control signal output end of the main control chip 1 is connected to the high-frequency transformer circuit 2, and the high-frequency transformer circuit 2 The telescopic contact 8 is connected to the input terminal of the tested insulator 7, the output terminal of the tested insulator 7 is connected to the input terminal of the sampling resistance circuit 3, and the output terminal of the sampling resistance circuit 3 is connected to the main control chip 1 The input terminal of the video and audio signal of the main control chip 1 is connected to the liquid crystal display module 5 and the voice broadcast module 6 through the A/D converter 4; one side of the insulating shell is provided with an adjustable elastic Fixing belt; the telescopic contact 8 is composed of a telescopic insulating rod and a conductive probe tip connected to the end of the telescopic insulating rod.

Further, the high-frequency transformer circuit 2 includes NPN transistors Q1~Q2, diodes D1~D2, capacitor C1, and a high-frequency transformer T1; the control signal output terminals of the main control chip 1 are respectively connected to NPN transistors Q1 ~ the base of Q2; the anode of the diode D1 is connected to the emitter of the NPN transistor Q1, and its cathode is connected to the collector of the NPN transistor Q1; the anode of the diode D2 is connected to the emitter of the NPN transistor Q2, and its cathode is connected to the emitter of the NPN transistor Q2. The collector of the NPN transistor Q2; the emitter of the NPN transistor Q1 is connected to the collector of the NPN transistor Q2; one end of the primary side of the high-frequency transformer T1 is connected to the cathode of the diode D2 through a capacitor C1, and the high-frequency transformer T1 The other end of the primary side is connected to the anode of the diode D2, and the secondary side of the high frequency transformer T1 is connected to the input end of the insulator 7 under test.

Further, the sampling resistance circuit 3 includes resistors R1~R3 and a dual operational amplifier LM358; the output terminals of the measured insulator 7 are respectively connected to the negative pole and positive pole of the dual operational amplifier LM358 through resistors R1 and R2, and the The resistor R3 is connected in parallel between the negative pole and the output terminal of the dual operational amplifier LM358, and the output terminal of the dual operational amplifier LM358 is connected to the input terminal of the A/D converter 4 .

Further, the model of the liquid crystal display module 5 is JLX2402A.

Further, the model of the voice broadcast module 6 is WT588D.

Further, the main control chip 1 is a PIC16F series single-chip microcomputer.

The working process of this embodiment is as follows:

This voice digital display insulator zero value tester adopts the PIC16F series single-chip microcomputer of Microsoft Corporation of the United States as the main control chip 1 to generate PWM pulse signals, control the high-frequency transformer circuit 2 to generate 5000V high voltage, and load it to the test piece through the telescopic contact 8. On the insulator 7, the voltage and current sampling is realized by the sampling resistance circuit 3, the resistance of the test piece is calculated by the main control chip 1, and then output to the liquid crystal display module 5 and the voice broadcast module 6 through the A/D converter 4 for numerical display and Voice broadcast. The voice numerical insulator zero value tester has an exquisite appearance design and is easy to operate. When using this device, the operator only needs to move a few parts of the body without sticking out the whole body to realize the insulator zero value test, which improves the safety of the test process. When in use, the operator needs to put the adjustable elastic fixing belt on one side of the insulating shell on his hand, and only needs to turn on the switch of the tester and press the button to trigger the tester to start the test. The contacts are not easily deformed when accidentally touching hard objects, and are generally applicable to different voltage levels and different types of insulators.

When using the voice digital display insulator zero value tester for testing, the insulator resistance value can be displayed on the LCD screen in real time. When the resistance value reaches the 500MΩ required by the regulations, the voice broadcasts "good", and when the resistance value is lower than 500MΩ, the voice broadcasts the value.

The above-mentioned implementations are only preferred embodiments of the present utility model, rather than an exhaustive list of feasible implementations of the present utility model. For those skilled in the art, any obvious changes made without departing from the principle and spirit of the utility model should be considered to be included in the protection scope of the claims of the utility model.

Claims (7)

1. An insulator zero-value comprehensive test device, characterized in that it includes an insulating casing, a main control chip (1) arranged in the insulating casing, a high-frequency transformer circuit (2), a sampling resistance circuit (3), A /D converter (4), liquid crystal display module (5) and voice broadcast module (6); the output end of the high-frequency transformer circuit (2) is provided with a retractable contact (8); the main control The control signal output terminal of the chip (1) is connected to the high-frequency transformer circuit (2), and the high-frequency transformer circuit (2) is connected to the input terminal of the tested insulator (7) through the retractable contact (8), The output terminal of the tested insulator (7) is connected to the input terminal of the sampling resistance circuit (3), and the output terminal of the sampling resistance circuit (3) is connected to the input terminal of the main control chip (1), and the main control chip (1) The video and audio signal output terminal of the chip (1) is connected to the liquid crystal display module (5) and the voice broadcast module (6) through the A/D converter (4); the telescopic contact (8) is provided by a telescopic insulation rod and a conductive probe tip attached to the end of the telescoping insulating rod. 2. A comprehensive test device for insulator zero value according to claim 1, characterized in that: the high-frequency transformer circuit (2) includes NPN transistors Q1~Q2, diodes D1~D2, capacitor C1 and high-frequency Transformer T1; the control signal output terminals of the main control chip (1) are respectively connected to the bases of NPN transistors Q1~Q2; the anode of the diode D1 is connected to the emitter of the NPN transistor Q1, and its cathode is connected to the NPN transistor The collector of Q1; the anode of the diode D2 is connected to the emitter of the NPN transistor Q2, and its cathode is connected to the collector of the NPN transistor Q2; the emitter of the NPN transistor Q1 is connected to the collector of the NPN transistor Q2; One end of the primary side of the high-frequency transformer T1 is connected to the negative pole of the diode D2 through the capacitor C1, the other end of the primary side of the high-frequency transformer T1 is connected to the positive pole of the diode D2, and the secondary side of the high-frequency transformer T1 is connected to the measured The input end of the insulator (7). 3. An insulator zero value comprehensive testing device according to any one of claims 1 or 2, characterized in that: the sampling resistance circuit (3) includes resistors R1~R3 and dual operational amplifiers LM358; the tested The output terminals of the insulator (7) are respectively connected to the negative pole and positive pole of the dual operational amplifier LM358 via resistors R1 and R2, and the resistor R3 is connected in parallel between the negative pole and the output terminal of the dual operational amplifier LM358. The output end of the amplifier LM358 is connected to the input end of the A/D converter (4). 4. The comprehensive test device for insulator zero value according to claim 1, characterized in that: the model of the liquid crystal display module (5) is JLX2402A. 5. An insulator zero value comprehensive testing device according to claim 1, characterized in that: the model of the voice broadcast module (6) is WT588D. 6. A comprehensive testing device for insulator zero value according to claim 1, characterized in that: the main control chip (1) is a PIC16F series single-chip microcomputer. 7 . The comprehensive test device for zero value of an insulator according to claim 1 , characterized in that: one side of the insulating shell is provided with an adjustable elastic fixing belt. 7 .