CN105467280A - Insulator zero value comprehensive test device - Google Patents

Abstract

The invention discloses an insulator zero-value comprehensive test 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, an A/D converter, Liquid crystal display module and voice broadcast module; telescopic contacts are provided on the output end of the high-voltage frequency conversion circuit; 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 The input end of the insulator under test and the output end of the insulator under test are 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 voice broadcast module through the A/D converter 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 invention has the advantages of being suitable for insulators with various disk diameters, being convenient to use, and improving the safety and work efficiency of the testing process.

Description

A comprehensive testing device for insulator zero value

technical field

The invention 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 labor-intensive.

Contents of the invention

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

The present invention adopts following technical scheme:

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-voltage frequency conversion circuit is provided with telescopic contacts; the control signal output end of the main control chip is connected to the high-frequency transformation circuit, and the high-frequency transformation circuit is connected to the insulator under test through the telescopic contacts. Input end, the output end of the insulator under test is connected to the input end of the sampling resistance circuit, the output end of the sampling resistance circuit is connected to the input end of the main control chip, and the video and audio signal output end of the main control chip is passed through A The /D converter is connected to the liquid crystal display module and the voice broadcast module; one side of the insulating shell is provided with an adjustable elastic fixing belt; the telescopic contact is connected to the telescopic Consists of a conductive probe tip at the end of an 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; the primary side of the high-frequency transformer T1 is connected to both ends of the diode D2 through a capacitor C1, and the high-frequency transformer T1 The secondary side of the insulator 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 present invention are: the present invention 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 provided for insulators whose insulation resistance meets the requirements during the test, that is, when the contact is in contact with the insulator When the steel cap of the insulator is in bad contact and the result is not measured, the voice broadcast module in the present invention will send out an alarm prompt to make it less likely to miss the test; the contact in the present invention adopts a telescopic design, which is suitable for various diameter insulators Not only is it convenient to use without replacing the contacts, but it also improves the test efficiency, improves the safety of the test process, improves the work efficiency of insulator zero value detection, and further increases the scope of application.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is the circuit schematic diagram of sampling resistance circuit in the present invention

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 present invention will be 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-voltage frequency conversion circuit 2 is provided with a telescopic contact 8; the control signal output end of the main control chip 1 is connected to the high-frequency transformation circuit 2, and the high-frequency transformation circuit 2 is stretched Type 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 input terminal of the main control chip 1 end, the video and audio signal output end 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 consists 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; the primary side of the high-frequency transformer T1 is connected to both ends of the diode D2 through a capacitor C1, and the high-frequency The secondary side of the transformer T1 is connected to the input end of the tested insulator 7 .

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

Claims (7)

1. an insulator null value full test device, is characterized in that: it comprises insulation crust, the main control chip (1) be arranged in insulation crust, high frequency transforming circuit (2), sample resistance circuit (3), A/D converter (4), LCD MODULE (5) and voice broadcast module (6); The output terminal of described high-pressure frequency-conversion circuit (2) is provided with telescopic contact (8); Control signal output terminal access high frequency transforming circuit (2) of described main control chip (1), described high frequency transforming circuit (2) is connected on the input end of tested insulator (7) through telescopic contact (8), the input end of output terminal access sample resistance circuit (3) of described tested insulator (7), the input end of output terminal access main control chip (1) of described sample resistance circuit (3), the video/audio signal output terminal of described main control chip (1) accesses described LCD MODULE (5) and voice broadcast module (6) through A/D converter (4); Described telescopic contact (8) is made up of telescopic insulating bar and the conductive tips being connected to described telescopic insulating bar end.

2. a kind of insulator null value full test device according to claim 1, is characterized in that: described high frequency transforming circuit (2) comprises NPN type triode Q1 ~ Q2, diode D1 ~ D2, electric capacity C1 and high-frequency transformer T1; The control signal output terminal of described main control chip (1) accesses the base stage of NPN type triode Q1 ~ Q2 respectively; The positive pole of described diode D1 connects the emitter of NPN type triode Q1, and its negative pole connects the collector of NPN type triode Q1; The positive pole of described diode D2 connects the emitter of NPN type triode Q2, and its negative pole connects the collector of NPN type triode Q2; The emitter of described NPN type triode Q1 connects the collector of NPN type triode Q2; The primary side of described high-frequency transformer T1 is connected on the two ends of diode D2 through electric capacity C1, the input end of the described tested insulator (7) of secondary side access of described high-frequency transformer T1.

3. a kind of insulator null value full test device according to any one of claim 1 or 2, is characterized in that: described sample resistance circuit (3) comprises resistance R1 ~ R3 and dual operational amplifier LM358; The output terminal of described tested insulator (7) accesses negative pole and the positive pole of described dual operational amplifier LM358 respectively through resistance R1 and R2, between the negative pole that described resistance R3 is connected in parallel on described dual operational amplifier LM358 and output terminal, the output terminal of described dual operational amplifier LM358 accesses the input end of described A/D converter (4).

4. a kind of insulator null value full test device according to claim 1, is characterized in that: the model of described LCD MODULE (5) is JLX2402A.

5. a kind of insulator null value full test device according to claim 1, is characterized in that: the model of described voice broadcast module (6) is WT588D.

6. a kind of insulator null value full test device according to claim 1, is characterized in that: described main control chip (1) is PIC16F series monolithic.

7. a kind of insulator null value full test device according to claim 1, is characterized in that: the side of described insulation crust is provided with the fixed band of tightness adjustable.