CN219224905U - Multifunctional insulation resistance test meter pen - Google Patents
Multifunctional insulation resistance test meter pen Download PDFInfo
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- CN219224905U CN219224905U CN202223054990.6U CN202223054990U CN219224905U CN 219224905 U CN219224905 U CN 219224905U CN 202223054990 U CN202223054990 U CN 202223054990U CN 219224905 U CN219224905 U CN 219224905U
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- outer sheath
- resistance test
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Abstract
The utility model discloses a multifunctional insulation resistance test meter pen, which comprises an insulation outer sheath; the front end of the insulating outer sheath is provided with a metal contact for contacting a to-be-tested article; the front end of the insulating outer sheath is also provided with an audible and visual alarm device; the inside of the insulating outer sheath is provided with a built-in circuit board, and the outer surface of the insulating outer sheath is provided with a digital voltage display and a change-over switch; the tail end of the insulation outer sheath is provided with a common meter pen plug interface for plugging a common meter pen on the insulation resistance tester. The utility model can not only test the insulation resistance, but also test whether the tested object has induction electricity or whether the tested object is electrified by directly assembling with the common insulation resistance test meter pen; three functions are added on the meter pen meeting the daily insulation resistance test at the same time: direct current voltage test function, alternating current and induction electric test function, and sudden overvoltage protection alarm function.
Description
Technical Field
The utility model relates to the technical field of insulation resistance testing of various primary equipment in the electric power technology, high-voltage test and transformer substation installation and maintenance, in particular to a multifunctional insulation resistance testing stylus.
Background
The insulation resistance test is a basic item of an electrical test in a new building or overhauling process of a transformer substation, is a conventional means for checking the insulation performance of equipment, is also a preliminary test of a withstand voltage test, and can be used for finding out relatively large insulation defects such as local mechanical damage, insulation internal bubbles, ceramic dielectric cracks and the like of a tested product before the destructive test is carried out.
The insulation resistance tester used at present is characterized in that the test meter pen is a test meter pen with an insulation shell of a middle conductor. The metal test head is conductive, and the shell is insulated to protect the tester. The following common problems occur during the daily test: the test sample has induced electricity, and particularly, the circuit often has induced electricity when insulation test is performed on the circuit, or the secondary terminal is electrified when insulation resistance of the secondary terminal is tested. Live insulation resistance testing not only violates operating regulations but also causes injury to equipment and personnel. The conventional insulation resistance tester does not have a function of testing whether a test object is charged. Measurement with a multimeter is often required prior to testing. Under the condition of larger induction electricity, a voltage transformer is additionally arranged for transformation. Making the testing process cumbersome. Meanwhile, when the test sample is subjected to sudden overvoltage (such as lightning overvoltage generated by a circuit in the circuit insulation test process), the common insulation resistance test meter pen cannot protect testers and test instruments. In order to optimize the insulation resistance test flow and improve the insulation resistance test efficiency, protect testers and test instruments, a multifunctional insulation resistance test meter pen with a voltage test function and an induction electric alarm function is needed.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides the multifunctional insulation resistance test pen which has the advantages of practical function, easiness in operation, capability of fixing different types of ground glass bottles with plugs for pouring and measuring oil quantity, and no influence on the environment and human body caused by oil seepage.
The utility model is realized by the following technical scheme:
a multifunctional insulation resistance test stylus, comprising:
an insulating outer sheath (1);
the metal contact (2) is arranged at the front end of the insulating outer sheath (1) and is used for contacting a to-be-tested article;
an audible and visual alarm device (3); the device is arranged at the front end of the insulating outer sheath (1) and is used for sending out an audible and visual alarm signal;
the built-in circuit board (4) is arranged in the insulating outer sheath (1);
the digital voltage display (5) is arranged on the outer surface of the insulating outer sheath (1) and used for displaying a voltage value;
the change-over switch (6) is arranged on the outer surface of the insulating outer sheath (1) and is used for switching different test circuits;
the common meter pen socket (7) is arranged at the tail end of the insulation outer sheath (1) and is used for being inserted with a common meter pen (81) on the insulation resistance tester (8).
In a further scheme, an alternating current test loop, a direct current test loop and an insulation resistance test loop are arranged on the built-in circuit board (4).
In a further scheme, a first piezoresistor (41) is arranged in the alternating current test loop, and the threshold value of the first piezoresistor (41) is 3000V; the insulation resistance test circuit is provided with a second piezoresistor (42), and the threshold value of the second piezoresistor (42) is 10000V.
In a further scheme, the alternating current test loop and the insulation resistance test loop are electrically connected with an audible and visual alarm device (3).
In a further scheme, the alternating current test loop and the direct current test loop are electrically connected with a digital voltage display (5).
In a further scheme, the change-over switch (6) is provided with three gears which can be adjusted and converted, and the three gears are respectively connected with an alternating current test loop, a direct current test loop and an insulation resistance test loop.
In a further scheme, a magnet (71) is arranged on the common pen plug interface (7), and a buffer rubber pad (72) is arranged at the tail end of the common pen plug interface (7).
The working principle of the utility model is as follows:
according to the utility model, three functions are added on the meter pen meeting the daily insulation resistance test at the same time: a direct-current voltage test function, an alternating-current and induction electric test function and a sudden overvoltage protection alarm function;
direct current voltage test function: the method is mainly applied to testing whether the secondary terminal has direct current before insulation resistance testing is carried out on the testing end. The principle that a universal meter measures direct-current voltage is utilized, the voltage is divided by a voltage divider, and if a secondary terminal is provided with direct-current voltage, the direct-current voltage value is displayed on a digital voltage display;
alternating current and induction electricity test function: the test terminal can be used for testing whether alternating current exists or not and the induced voltage of the tested product, the magnitude of the alternating voltage can be measured, and the alternating voltage value is displayed on a digital voltage display; meanwhile, when the alternating current voltage (induced voltage) U1 is more than 3000V, the AC gear pressure-sensitive loop acts, an audible and visual alarm system is started, and a tester is reminded that the induced voltage is too high, so that the test is not suitable;
sudden overvoltage protection alarm function: in the insulation resistance test process, when sudden overvoltage occurs, for example, lightning stroke line overvoltage occurs in the line insulation test process, when the overvoltage value U2 is more than 10000V, the piezoresistor arranged in the measurement loop discharges to the ground, and an audible and visual alarm signal is sent out to remind a tester of the sudden overvoltage, and the test is stopped immediately.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model can not only test the insulation resistance, but also test whether the tested object has induction electricity or whether the tested object is electrified by directly assembling with the common insulation resistance test meter pen; before the normal insulation resistance test is carried out, the change-over switch is regulated, so that the induction electricity of the tested product can be tested, and the magnitude of alternating current or direct current carried by the tested product can be measured;
when the induction power of the tested object exceeds 3000V in the test, the device can automatically discharge the ground and generate audible and visual alarm, so that the personal safety of the tested person is protected and the tested object is prevented from being damaged; when overvoltage and overcurrent occur in the testing process, the pressure sensitive circuit acts, so that the testers and the testing instruments can be protected from being damaged.
Drawings
FIG. 1 is a perspective view of the structure of the present utility model;
FIG. 2 is a schematic illustration of the insertion of the present utility model with a conventional stylus;
FIG. 3 is a circuit diagram of a built-in circuit board of the present utility model;
fig. 4 is a use state diagram of the present utility model.
Reference numerals in the drawings:
1-an insulating outer sheath;
2-metal contacts;
3-an audible and visual alarm device;
4-built-in circuit board, 41-alternating current test loop, 42-direct current test loop, 43-insulation resistance test loop, 401-first piezoresistor, 402-second piezoresistor;
a 5-digital voltage display;
a 6-change-over switch;
7-a common meter pen socket, 71-a magnet and 72-a buffer rubber pad;
8-insulation resistance tester, 81-ordinary meter pen.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present utility model, the following detailed description is provided with reference to the accompanying drawings.
As shown in fig. 1-4, a multifunctional insulation resistance test pencil comprises an insulation outer sheath 1; the front end of the insulating outer sheath 1 is provided with a metal contact 2 for contacting a to-be-tested article; the front end of the insulating outer sheath 1 is also provided with an audible and visual alarm device 3; the inside of the insulating outer sheath 1 is provided with a built-in circuit board 4, and the outer surface of the insulating outer sheath 1 is provided with a digital voltage display 5 and a change-over switch 6; the tail end of the insulating outer sheath 1 is provided with a common meter pen plug-in interface 7 for plugging a common meter pen 81 on the insulating resistance tester 8.
In some embodiments, as shown in fig. 3, an ac test circuit 41, a dc test circuit 42, and an insulation resistance test circuit 43 are provided on the built-in circuit board 4.
In some embodiments, as shown in fig. 3, the ac test circuit 41 is used to test whether the test object has induction electricity or ac electricity; the alternating current test loop 41 is formed by connecting a voltage test branch and a pressure-sensitive alarm branch in parallel, wherein a capacitor C1 and a capacitor C2 on the voltage test branch are connected in series, two poles of the capacitor C2 are connected with an alternating current voltmeter, a first piezoresistor 41 and an audible and visual alarm device 3 on the pressure-sensitive alarm branch are connected in series, one pole at the front end of the alternating current test loop 41 is connected with an AC (alternating current) gear of the change-over switch 6, and one pole at the tail end of the alternating current test loop 41 is grounded.
In some embodiments, as shown in fig. 3, the dc test circuit 42 is used to test whether dc is present in the test object; the resistor R1 and the resistor R2 on the direct current test loop 42 are connected in series, the two poles of the resistor R2 are connected with a direct current voltmeter, one pole at the front end of the direct current test loop 42 is connected with the DC gear of the change-over switch 6, and the other pole at the tail end of the direct current test loop 42 is grounded.
In some embodiments, as shown in fig. 3, an insulation resistance test circuit 43 is provided with a sudden overvoltage protection branch, a second piezoresistor 42 on the sudden overvoltage protection branch is connected in series with the audible and visual alarm device 3, the sudden overvoltage protection branch and one pole of the front end of an insulation resistance test wire are connected with the OFF gear of the change-over switch 6, and one pole of the tail end of the sudden overvoltage protection branch is grounded; the end of the insulation resistance testing wire is connected with the insulation resistance tester 8 in a pole way.
In some embodiments, as shown in fig. 3, a first varistor 41 is disposed in the ac test circuit, and the threshold of the first varistor 41 is 3000V; the insulation resistance test loop is provided with a second piezoresistor 42, and the threshold value of the second piezoresistor 42 is 10000V. In the induced voltage testing process, the pressure sensitive circuit can ensure that the first piezoresistor 41 acts to protect a tester and a tested product when the pressure sensitive circuit contacts an induced voltage greater than 3000V; during the insulation resistance test, sudden overvoltages, such as lightning strike line overvoltages, are encountered, and when the overvoltages are greater than 10000V, the second piezoresistor 42 acts, protecting personnel and test instruments.
In some embodiments, as shown in fig. 3, the ac test circuit and the insulation resistance test circuit are electrically connected with an audible and visual alarm device 3, and the audible and visual alarm device 3 is respectively connected with the first piezoresistor 41 and the second piezoresistor 42 in series; when the alternating current test loop 41 is tested, when the voltage is higher than 3000V, the circuit of the first piezoresistor 41 is conducted, and current flows through the audible and visual alarm device 3 to generate an audible and visual warning signal, so that a tester is prompted that the induction is too high, and the measurement is stopped; when the insulation resistance test loop 43 is tested, when the voltage is higher than 10000V, the second piezoresistor 42 is conducted, and current flows through the audible and visual alarm device 3 to generate an audible and visual warning signal, so that a tester is prompted to sense too high electricity, and measurement is stopped.
In some embodiments, as shown in fig. 3, voltmeters are disposed in the ac test circuit and the dc test circuit, and the voltmeters are electrically connected to the digital voltage display 5; the voltage display 5 is used for displaying the voltages of the ac test circuit 41 and the dc test circuit 42.
In some embodiments, the voltage display 5 has a display range of 0-3000V.
In some embodiments, as shown in fig. 1, the change-over switch 6 is provided with three gear positions for adjustable conversion, including: the AC gear connected with the AC test circuit 41, the DC gear connected with the DC test circuit 42 and the OFF gear connected with the insulation resistance test circuit 43 are adjusted to different gear positions by the change-over switch 6, so that the metal contact 2 is connected with different test circuits on the built-in circuit board 4 by wires.
In some embodiments, as shown in fig. 1, a magnet 71 is disposed on the ordinary pen socket 7, and the device is connected with an ordinary pen 81 of the ordinary insulation resistance tester 8 by using the principle of adsorption of the magnet 71, so as to prevent the ordinary pen 81 from falling off during the testing process.
In some embodiments, as shown in fig. 1 and 2, the end of the ordinary pen holder interface 7 is provided with a buffer rubber pad 72, and the buffer rubber pad 72 can buffer the acting force generated when the magnet 71 adsorbs the ordinary pen 81, so as to prevent the acting force from damaging the built-in circuit board 4.
In some embodiments, the insulation level of the insulating outer sheath 1 is LI75AC35/AC5, ensuring that the insulating outer sheath 1 has sufficient insulation margin when subjected to overvoltage.
The working mode of the utility model is as follows:
when the utility model is used for insulation resistance test, the utility model is firstly assembled on a common meter pen of an insulation resistance tester, and the characteristic of magnet adsorption for a loop of the device is automatically adsorbed with a common meter pen metal contact on the insulation resistance tester.
For the situation that whether the direct current exists in the equipment needs to be determined, for example, insulation resistance of a secondary circuit is tested, a change-over switch of the multifunctional meter pen is placed in a DC gear, a metal contact of the meter pen is used for contacting a tested object, if the tested object is electrified, a voltage digital display screen can display a direct current voltage value.
When the induction or alternating current of the equipment is tested, the change-over switch of the multifunctional meter pen is arranged in an AC (alternating current) file, the metal contact of the meter pen is used for contacting a tested product, and the voltage digital display screen can display a voltage value; when the induction voltage of the tested object is larger than 3000V, the pressure sensitive circuit arranged in the meter pen acts, the tested object discharges to the ground, and an audible and visual alarm signal is sent out to prompt the tester that the induction voltage is too high.
After the two steps are completed, the change-over switch is set at the OFF gear after the test object is determined to be not electrified, and at the moment, the insulation resistance test loop is switched on, so that the normal insulation resistance test can be performed; in the insulation resistance test process, when sudden overvoltage occurs, for example, lightning stroke line overvoltage occurs in the line insulation test process, when the overvoltage value U2 is larger than 10000V, the piezoresistor arranged in the measurement loop discharges to the ground, and an audible and visual alarm signal is sent out to remind a tester of the sudden overvoltage, and the test is stopped immediately.
It should be noted that the foregoing describes the technical solution of the present utility model in detail, and describes the principles of the present utility model, and the description of the above working principles is only used to help understand the core idea of the present utility model. It should be noted that it will be apparent to those skilled in the art that the present utility model may be modified and adapted without departing from the principles of the present utility model, and such modifications and adaptations are intended to be within the scope of the appended claims.
Modifications, additions, or substitutions to the described embodiments may be made by those skilled in the art without departing from the scope of the utility model as defined in the accompanying claims. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (7)
1. A multifunctional insulation resistance test pencil, comprising:
an insulating outer sheath (1);
the metal contact (2) is arranged at the front end of the insulating outer sheath (1) and is used for contacting a to-be-tested article;
an audible and visual alarm device (3); the device is arranged at the front end of the insulating outer sheath (1) and is used for sending out an audible and visual alarm signal;
the built-in circuit board (4) is arranged in the insulating outer sheath (1);
the digital voltage display (5) is arranged on the outer surface of the insulating outer sheath (1) and used for displaying a voltage value;
the change-over switch (6) is arranged on the outer surface of the insulating outer sheath (1) and is used for switching different test circuits;
the common meter pen socket (7) is arranged at the tail end of the insulation outer sheath (1) and is used for being inserted with a common meter pen (81) on the insulation resistance tester (8).
2. The multifunctional insulation resistance test pencil of claim 1, wherein: an alternating current test loop (41), a direct current test loop (42) and an insulation resistance test loop (43) are arranged on the built-in circuit board (4).
3. The multifunctional insulation resistance test pencil of claim 2, wherein: the alternating current test circuit is provided with a first piezoresistor (401), and the threshold value of the first piezoresistor (401) is 3000V; the insulation resistance test circuit is provided with a second piezoresistor (402), and the threshold value of the second piezoresistor (402) is 10000V.
4. The multifunctional insulation resistance test pencil of claim 2, wherein: the alternating current test loop and the insulation resistance test loop are electrically connected with an audible and visual alarm device (3).
5. The multifunctional insulation resistance test pencil of claim 2, wherein: the alternating current test loop and the direct current test loop are electrically connected with a digital voltage display (5).
6. The multifunctional insulation resistance test pencil of claim 1, wherein: the change-over switch (6) is provided with three gears which can be adjusted and converted, and the three gears are respectively connected with an alternating current test loop, a direct current test loop and an insulation resistance test loop.
7. The multifunctional insulation resistance test pencil of claim 1, wherein: the pen holder is characterized in that a magnet (71) is arranged on the common pen holder interface (7), and a buffer rubber pad (72) is arranged at the tail end of the common pen holder interface (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223054990.6U CN219224905U (en) | 2022-11-17 | 2022-11-17 | Multifunctional insulation resistance test meter pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223054990.6U CN219224905U (en) | 2022-11-17 | 2022-11-17 | Multifunctional insulation resistance test meter pen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219224905U true CN219224905U (en) | 2023-06-20 |
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ID=86758325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223054990.6U Active CN219224905U (en) | 2022-11-17 | 2022-11-17 | Multifunctional insulation resistance test meter pen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219224905U (en) |
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2022
- 2022-11-17 CN CN202223054990.6U patent/CN219224905U/en active Active
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