CN210690677U

CN210690677U - High-voltage electroscope

Info

Publication number: CN210690677U
Application number: CN201920838801.3U
Authority: CN
Inventors: 裴德军
Original assignee: China Shenhua Energy Co Ltd; Shenhua Shendong Power Co Ltd
Current assignee: China Shenhua Energy Co Ltd; Shenhua Shendong Power Co Ltd
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2020-06-05
Anticipated expiration: 2029-06-04

Abstract

The utility model discloses a high-voltage electroscope. Wherein, this test pencil includes: test electric head, insulating handle, its characterized in that, test the electric head and include: the high-voltage electroscope circuit is used for detecting whether an object to be detected is electrified or not; the breakpoint detection circuit is used for detecting the breakpoint position of the object to be detected; and the power supply is respectively connected with the high-voltage electricity testing circuit and the breakpoint detection circuit and is used for supplying power to the high-voltage electricity testing circuit and the breakpoint detection circuit. The utility model provides a current high pressure test pencil can't carry out the technical problem that the breakpoint detected to the circuit.

Description

High-voltage electroscope

Technical Field

The utility model relates to an electricity field is tested to high pressure particularly, relates to a high pressure test pencil.

Background

The existing high-voltage electroscope is suitable for voltage detection of 10KV and below underground, and can be used for detecting whether a conductor or a shell of equipment under a coal mine is electrified or not, and only has the function. Because the colliery is the working face cable distance in pit long, the terminal box is many, the trouble that the circuit opens circuit in the cable takes place easily, and difficult judgement fault point is in where after the condition that the cable opens circuit takes place, and professional instrument is bulky also not fit for using in the pit, and this device is installed at the internal circuit of high-pressure test pencil, has small in size, measures characteristics such as accurate, convenient to carry.

The function of the high-voltage test pencil carried by the electrician under the coal mine in daily life is mainly used for checking whether a high-voltage or low-voltage conductor, an electrical equipment shell and the like are electrified, the function is only limited to electrified detection and electricity test, no special instrument is used for detection once a cable disconnection fault occurs, and the electrician cannot carry a lot of measuring instruments and tools due to the special property of the coal mine work

Aiming at the problem that the existing high-voltage test pencil cannot detect the breakpoint of the circuit, an effective solution is not provided at present.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a high pressure test pencil to solve current high pressure at least and test the technical problem that the pencil can't carry out the breakpoint detection to the circuit.

According to an aspect of the embodiment of the utility model provides a high-pressure electrography is tested, include: test electric head, insulating handle, test the electric head and include: the high-voltage electroscope circuit is used for detecting whether an object to be detected is electrified or not; the breakpoint detection circuit is used for detecting the breakpoint position of the object to be detected; and the power supply is respectively connected with the high-voltage circuit testing circuit and the breakpoint detection circuit and used for supplying power to the high-voltage circuit testing circuit and the breakpoint detection circuit.

Further, the high voltage electroscope circuit includes: the electroscopic probe is arranged on the first surface of the electroscopic head shell, wherein the insulated handle is connected with the second surface of the electroscopic head shell, and the first surface is parallel to the second surface.

Further, the high voltage electroscope circuit includes: the alarm is arranged on the third surface of the shell of the electroscope head and used for indicating whether the object to be detected in contact with the electroscope probe is electrified or not; the first indicator light is arranged on the third surface of the shell of the electroscope head and used for indicating whether the object to be detected in contact with the electroscope probe is electrified or not; wherein the third surface is adjacent to the first surface and the second surface, respectively.

Further, the high voltage electroscope circuit includes: the self-checking switch is arranged on the third face of the electricity testing head shell and used for detecting whether the alarm can work normally or not through the first indicator light and the power supply after the self-checking switch is triggered.

Further, the breakpoint detection circuit includes: the induction contact is arranged on the fourth surface of the electroscope shell; the second indicator light is arranged on the fifth surface of the electroscope shell; wherein the fourth face is parallel to the fifth face.

Further, the breakpoint detection circuit further includes: and the amplifying circuit is connected with the induction contact, the indicator light and the power supply and is used for lightening the indicator light under the condition that the induction contact induces an electric signal.

Further, the second indicator light is a light emitting diode, and the amplifying circuit includes: a first transistor, wherein the base electrode of the first transistor is connected with the induction contact, and the collector electrode of the first transistor is connected with the positive electrode of the power supply; a second transistor, wherein a base of the second transistor is connected to an emitter of the first transistor, and a collector of the second transistor is connected to a positive electrode of the power supply; a third transistor, wherein the base of the third transistor is connected with the emitter of the second transistor, and the emitter of the third transistor is connected with the negative pole of the power supply; a cathode of the light emitting diode is connected with a collector of the third transistor; and the first end of the resistor is connected with the anode of the light-emitting diode, and the second end of the resistor is connected with the anode of the power supply.

Further, the high voltage electroscope pen still includes: and the power supply replacement window is arranged on the sixth surface of the electroscope shell and used for replacing the power supply.

Further, the high voltage electroscope pen still includes: the first end of connecting rod with test the electrical head and link to each other, the second end of connecting rod with insulating handle links to each other.

Further, the connecting rod includes: the first end of the first connecting rod is connected with the electroscope head; the first end of the second connecting rod is connected with the first connecting rod through a first rotating shaft; and the first end of the third connecting rod is connected with the second connecting rod through a second rotating shaft, and the second end of the third connecting rod is connected with the insulating handle.

In the embodiment of the utility model, the high-voltage electroscope comprises an electroscope head and an insulating handle, and the electroscope head is provided with a high-voltage electroscope circuit, a breakpoint detection circuit and a power supply, wherein the high-voltage electroscope circuit and the breakpoint detection circuit are respectively connected with the power supply, and the high-voltage electroscope circuit can detect whether an object to be detected is electrified or not under the driving of the power supply; the breakpoint detection circuit can detect the breakpoint position of an object to be detected under the driving of a power supply, so that the technical effects of live detection and breakpoint detection of the object to be detected are realized through the same high-voltage electroscope, and the technical problem that the existing high-voltage electroscope cannot perform breakpoint detection on the circuit is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a first schematic diagram of a high-voltage electroscope according to an embodiment of the present invention;

fig. 2 is a second schematic diagram of a high voltage test pencil according to an embodiment of the present invention;

fig. 3 is a third schematic diagram of a high-voltage test pencil according to an embodiment of the present invention;

fig. 4 is a fourth schematic diagram of a high voltage test pencil according to an embodiment of the present invention;

fig. 5 is a fifth schematic diagram of a high voltage test pencil according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an amplification circuit according to an embodiment of the invention;

fig. 7 is a sixth schematic diagram of a high voltage test pencil according to an embodiment of the present invention;

fig. 8 is a seventh schematic diagram of a high voltage test pencil according to an embodiment of the present invention;

fig. 9 is a schematic diagram eight of a high voltage test pencil according to an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below 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 efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such process, system, article, or apparatus.

Fig. 1 is a first schematic diagram of a high-voltage test pencil according to an embodiment of the present invention, as shown in fig. 1, the high-voltage test pencil may include: test electric head and insulating handle, wherein, test the electric head and include: the high-voltage electroscope circuit 10 is used for detecting whether an object to be detected is electrified or not; a breakpoint detection circuit 12 for detecting a breakpoint position of the object to be detected; and the power supply 14 is respectively connected with the high-voltage electricity testing circuit and the breakpoint detection circuit and is used for supplying power to the high-voltage electricity testing circuit and the breakpoint detection circuit.

Alternatively, the power source may be a battery, such as a button cell battery.

Optionally, the power supply uses a high voltage electroscope 4.5V battery voltage. Because the whole machine consumes very little electricity at ordinary times (actually measured <1 muA), a power switch is not needed.

Alternatively, the insulated handle may be a PVC handle (i.e., a polyvinyl chloride handle).

Optionally, the electroscope can be a square box similar to a rectangle, wherein the shell of the electroscope comprises six faces, namely a first face, a second face, a third face, a fourth face, a fifth face and a sixth face, the battery is arranged in the electroscope inner circuit, the high-voltage electroscope circuit and the breakpoint detection circuit comprise a circuit part, a detection part and a display part, wherein the detection part and the display part are arranged on the surface of the electroscope shell, and the circuit part is arranged in the electroscope and connected with the battery.

Optionally, the electroscope housing may be made of an insulating material.

Optionally, the detection part comprises: the high-voltage electricity testing circuit comprises an electricity testing probe of the high-voltage electricity testing circuit and an induction contact of a breakpoint detection circuit; the display section includes: the high-voltage electricity testing circuit comprises a first indicator light of the high-voltage electricity testing circuit, an alarm of the high-voltage electricity testing circuit and a second indicator light of the breakpoint detection circuit.

Fig. 2 is a schematic diagram two of a high voltage test pencil according to the embodiment of the present invention, as shown in fig. 2, which is a front view of the high voltage test pencil, wherein the high voltage test pencil may include: test electric head 21 and insulating handle 23, high-voltage electroscope circuit 10 includes: electroscope probe 101, set up in the first face of electroscope shell, wherein, insulating handle 23 is connected with the second face of electroscope shell, and first face is parallel with the second face.

The above-mentioned embodiment of the utility model, test the electric head and include that high pressure tests the electric circuit, wherein, high pressure tests the electric probe salient in testing the first shell of electricity, and tests electric probe and insulating handle and set up respectively in testing first shell coparallel first face and second face, also test electric probe, test electric head, handle and arrange in proper order on same axis.

Fig. 3 is a third schematic diagram of a high-voltage electroscope according to the embodiment of the present invention, as shown in fig. 3, which is a front view of the high-voltage electroscope, wherein the high-voltage electroscope circuit includes: the alarm 103 is arranged on the third surface of the electroscope shell and used for indicating whether the object to be detected in contact with the electroscope probe is electrified or not; the first indicator lamp 105 is arranged on the third surface of the electroscope shell and used for indicating whether an object to be detected in contact with the electroscope probe is electrified or not; wherein the third surface is adjacent to the first surface and the second surface respectively.

The above-mentioned embodiment of the utility model, the third face of testing the first shell of telecommunication is continuous with first face and second face respectively, sets up alarm and first pilot lamp on the third face of testing the first shell of telecommunication, tests the electric probe contact await measuring object back of electric of high pressure at the high pressure, if the await measuring object is electrified then can light the first pilot lamp on the third face of testing the first shell of telecommunication, the alarm begins to report to the police simultaneously.

Alternatively, the alarm may be a buzzer.

Alternatively, the first indicator light may be a light emitting diode.

As an alternative embodiment, as shown in fig. 3, the high voltage electroscope circuit includes: self-checking switch 107 sets up at the third face of examining the first shell of electricity for after self-checking switch triggers, detect alarm, first pilot lamp and power whether can normally work.

According to the above embodiment of the present invention, before the high voltage test pencil is used for testing electricity, the self-checking switch can be pressed first to detect the high voltage test circuit on the high voltage test pencil, and if the self-checking switch is pressed, the first indicator light is turned on, and the alarm gives an alarm sound, it is indicated that the state of the high voltage test circuit on the high voltage test pencil is normal; if the brightness of the first indicator lamp point is weak and the alarm sound sent by the alarm is weak after the self-checking switch is pressed down, the fact that the electric quantity of the power supply in the high-voltage electroscope is insufficient is indicated; if the first indicator lamp is not lightened and the alarm does not give an alarm sound after the self-checking switch is pressed down, the situation that the point power supply in the high-voltage electroscope is dead or the high-voltage electroscope circuit is in failure is indicated; if the first indicator lamp is turned on and the alarm does not give an alarm sound after the self-checking switch is pressed down, the alarm on the high-voltage electroscope is indicated to be in fault; if the first indicator lamp is not lightened after the self-checking switch is pressed down, and the alarm gives out an alarm sound, the first indicator lamp on the high-voltage electroscope is indicated to be in fault.

As an alternative embodiment, the breakpoint detection circuit includes: the induction contact is arranged on the fourth surface of the shell of the electroscope; the second indicator light is arranged on the fifth surface of the shell of the electroscope; wherein the fourth surface is parallel to the fifth surface.

Optionally, the fourth surface and the fifth surface are adjacent to the first surface, the second surface, and the third surface, respectively.

Fig. 4 is according to the utility model discloses a fourth of high pressure test pencil's schematic diagram, as shown in fig. 4, is the side view of high pressure test pencil, and wherein, breakpoint detection circuit includes: the sensing contact 41 is arranged on the fourth surface of the electroscope shell, namely the sensing contact 41 is arranged on the side surface of the electroscope shell.

Optionally, the inductive contact may be fixed to the shell of the electroscope by a conductive screw, and connected to the breakpoint detection circuit.

Alternatively, the inductive contacts may be metal inductive strips, for example, iron strips of approximately 10 mm.

Fig. 5 is according to the utility model discloses a schematic diagram five of high pressure electrography, as shown in fig. 5, is the side view of high pressure electrography, and wherein, breakpoint detection circuit includes: the second indicator light 53 is arranged on the fifth surface of the shell of the electroscope; wherein, the fourth face is parallel with the fifth face, that is to say second pilot lamp 53 sets up the side at the electroscope shell.

Alternatively, the second indicator light may be a different color than the first indicator light, e.g., the first indicator light may emit red light and the second indicator light may emit blue light.

Alternatively, the object to be measured may be a cable, and the breakpoint detection circuit may detect a breakpoint position of the alternating current cable.

The above embodiment of the present invention can use the sensing contact of the high voltage test pencil to approach the cable, if the cable is electrified, the sensing contact can sense the electrical signal of the cable, and the breakpoint detection circuit can drive the second indicator light to light according to the electrical signal sensed by the sensing contact; if the cable is not electrified, then the signal of telecommunication of the unable cable of sensing of response contact, the second pilot lamp can not be lighted to breakpoint detection circuit yet, at the in-process that carries out the breakpoint detection, can remove high-pressure electroscope, observes the bright change of going out of second pilot lamp, if the second pilot lamp goes out by shining, the position that makes the second pilot lamp extinguish is the breakpoint position of cable promptly.

As an alternative embodiment, the breakpoint detection circuit further includes: and the amplifying circuit is connected with the sensing contact, the indicator light and the power supply and is used for lighting the indicator light under the condition that the sensing contact senses the electric signal.

The above-mentioned embodiment of the utility model, amplifier circuit links to each other with induction contact, pilot lamp and power respectively, can be under the electric drive that the power provided, enlargies the signal of telecommunication that induction contact sensed to light the pilot lamp.

Fig. 6 is a schematic diagram of an amplifying circuit according to an embodiment of the present invention, as shown in fig. 6, the second indicator light is a light emitting diode VD, and the amplifying circuit includes: the LED comprises a light emitting diode VD, a first transistor VT1, a second transistor VT2, a third transistor VT3 and a resistor R, wherein the base electrode of the first transistor VT1 is connected with the inductive contact 41, and the collector electrode of the first transistor VD is connected with the anode of the power supply 16; the base of the second transistor VT2 is connected to the emitter of the first transistor VT1, and the collector of the second transistor VT2 is connected to the anode of the power supply 16; the base of the third transistor VT3 is connected to the emitter of the second transistor VT2, and the emitter of the third transistor VT3 is connected to the negative pole of the power supply 16; the cathode of the light emitting diode VD is connected to the collector of the third transistor VT 3; a first terminal of the resistor VT1 is connected to the anode of the light emitting diode VD, and a second terminal of the resistor VT1 is connected to the anode of the power supply 16.

The utility model discloses above-mentioned embodiment, when the inductive contact was close to because of the 660V of open circuit or 1140V alternating current one-phase cable, can sense very weak 50Hz alternating current signal, through VT1, VT2 and VT3 enlargies the back, and drive emitting diode VD sends the light. However, when the inductive contact is close to the cable at the side without voltage, no inductive electric signal exists, VT1, VT2 and VT3 are all cut off, and VD does not emit light. Therefore, the position of the cable breakpoint can be found out according to the on-off change of the VD.

Alternatively, the first transistor VT1, the second transistor VT2 and the third transistor VT3 may be triodes, such as a 9014 type silicon NPN low-power triode or a 3DG8 type silicon NPN low-power triode.

Alternatively, the light emitting diode VD may be a general blue light emitting diode.

Optionally, the shell of testing the electricity head can the split be two parts, if first test the electricity head shell and the first shell of second test, after the shell split of testing the electricity head, can spill high-pressure test electric circuit, breakpoint detection circuit and power, and then when the power of high-pressure test pencil is changed to needs, can split the shell of testing the electricity head, then change the power again.

Optionally, the first electroscope shell and the second electroscope shell can be combined into the shell of the electroscope head through screws, and can also be combined into the shell of the electroscope head through elastic buckles.

Because the shell of testing the electroprobe all need be disassembled to the power of changing high pressure at every turn and testing the electroprobe, but the process of changing the power is more complicated, and disassembles the structural strength that also can influence the shell of testing the electroprobe many times to the shell of testing the electroprobe, consequently, can set up the battery and change the window on the shell of testing the electroprobe to can change the power of high pressure testing the electroprobe through the battery change window, and need not to gather and disassemble the shell of testing the electroprobe.

Fig. 7 is a sixth schematic diagram of a high-voltage test pencil according to the embodiment of the present invention, as shown in fig. 7, which is a front view of the high-voltage test pencil, wherein the high-voltage test pencil further includes: and the power supply replacing window 71 is arranged on the sixth surface of the shell of the electroscope and is used for replacing the power supply.

Optionally, the power supply replacement window comprises a groove and a detachable baffle plate, and the power supply of the high-voltage electroscope can be fixed through the groove and the baffle plate. For example, in the process of replacing the power supply, the baffle plate can be detached to expose the power supply in the groove; then take out the power from the recess to place the power of replacement in the recess, then cover the baffle, thereby accomplish the power change to high-pressure test pencil.

Fig. 8 is a seventh schematic diagram of the high voltage test pencil according to the embodiment of the present invention, as shown in fig. 8, which is a front view of the high voltage test pencil, wherein the high voltage test pencil further includes: the connecting rod 81, the first end of connecting rod 81 links to each other with electroscope head 21, and the second end of connecting rod 81 links to each other with insulating handle 23.

Fig. 9 is a schematic diagram eight of a high voltage test pencil according to the embodiment of the present invention, as shown in fig. 9, which is a side view of the high voltage test pencil, wherein the connecting rod 81 includes: a first connecting rod 811, a second connecting rod 813 and a third connecting rod 815, wherein a first end of the first connecting rod 811 is connected with the electroscope head 21; a first end of the second connecting rod 813 is connected with the first connecting rod 811 through a first rotating shaft; a first end of the third connecting rod 815 is connected to the second connecting rod 813 via a second rotating shaft, and a second end of the third connecting rod is connected to the insulating handle 23.

The above-mentioned embodiment of the utility model provides an, can link to each other through the pivot between the different connecting rods, then the connecting rod can rotate for the center according to the pivot to change the relative position relation of insulated handle and test the electricity head, adjust the gesture of testing the electricity head in a flexible way.

The utility model provides a test the electrography at high pressure, tested the unnecessary position of electrography's internal circuit at high pressure and installed one set of breakpoint detection circuit, this breakpoint detection circuit's power can directly be taken from the high pressure and test the electrography battery, does not need the independent power supply to power consumptive low. The device is convenient and reliable in use, and can be used for non-contact measurement of a charged body and measurement of disconnection and disconnection of a circuit in a cable.

Because the breakpoint detection circuit is installed in the internal circuit of the high-voltage electroscope (namely in the electroscope head), the high-voltage electroscope with the breakpoint detection circuit has the characteristics of small volume, accurate measurement, convenience in carrying and the like, is flexible and convenient to use, and is an uncommon detection small tool for underground electricians of coal mines.

High-pressure test pencil (test pencil) is the electrician and hand-carries supplementary safety tool commonly used, and whether mainly used inspection high pressure or low voltage conductor or electrical equipment shell etc. are electrified, the utility model provides a high-pressure test pencil utilizes high-pressure test pencil's unnecessary space installation breakpoint detection function, accomplishes to respond to non-contact after "a tractor serves two purposes" cable broken string and measures, seeks the fault point fast, overhauls for the electrician and has improved work efficiency. .

The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and the circuit branch not described in detail in a certain embodiment can be referred to the relevant descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.

The units described as separate circuits may or may not be physically separate, and circuits shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. The purpose of the solution of the present embodiment can be achieved by selecting the circuit sub-or full-circuit units according to actual needs.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all the circuits or circuit steps of the method according to various embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A high voltage test pencil comprising: test electric head, insulating handle, its characterized in that, test electric head and include:

the high-voltage electroscope circuit is used for detecting whether an object to be detected is electrified or not;

the breakpoint detection circuit is used for detecting the breakpoint position of the object to be detected;

and the power supply is respectively connected with the high-voltage circuit testing circuit and the breakpoint detection circuit and used for supplying power to the high-voltage circuit testing circuit and the breakpoint detection circuit.

2. The test pencil of claim 1 wherein the high voltage test circuit comprises:

the electroscopic probe is arranged on the first surface of the electroscopic head shell, wherein the insulated handle is connected with the second surface of the electroscopic head shell, and the first surface is parallel to the second surface.

3. The test pencil of claim 2 wherein the high voltage test circuit comprises:

the alarm is arranged on the third surface of the shell of the electroscope head and used for indicating whether the object to be detected in contact with the electroscope probe is electrified or not;

the first indicator light is arranged on the third surface of the shell of the electroscope head and used for indicating whether the object to be detected in contact with the electroscope probe is electrified or not;

wherein the third surface is adjacent to the first surface and the second surface, respectively.

4. The test pencil of claim 3 wherein the high voltage test circuit comprises:

the self-checking switch is arranged on the third face of the electricity testing head shell and used for detecting whether the alarm can work normally or not through the first indicator light and the power supply after the self-checking switch is triggered.

5. The test pencil of claim 1 wherein the breakpoint detection circuit comprises:

the induction contact is arranged on the fourth surface of the electroscope shell;

the second indicator light is arranged on the fifth surface of the electroscope shell;

wherein the fourth face is parallel to the fifth face.

6. The test pencil of claim 5 wherein the breakpoint detection circuit further comprises:

and the amplifying circuit is connected with the induction contact, the indicator light and the power supply and is used for lightening the indicator light under the condition that the induction contact induces an electric signal.

7. The test pencil of claim 6 wherein the second indicator light is a light emitting diode, the amplification circuit comprising:

a first transistor, wherein the base electrode of the first transistor is connected with the induction contact, and the collector electrode of the first transistor is connected with the positive electrode of the power supply;

a second transistor, wherein a base of the second transistor is connected to an emitter of the first transistor, and a collector of the second transistor is connected to a positive electrode of the power supply;

a third transistor, wherein the base of the third transistor is connected with the emitter of the second transistor, and the emitter of the third transistor is connected with the negative pole of the power supply;

a cathode of the light emitting diode is connected with a collector of the third transistor;

and the first end of the resistor is connected with the anode of the light-emitting diode, and the second end of the resistor is connected with the anode of the power supply.

8. The test pencil of claim 1 wherein the high voltage test pencil further comprises:

and the power supply replacement window is arranged on the sixth surface of the electroscope shell and used for replacing the power supply.

9. The test pencil of claim 1 wherein the high voltage test pencil further comprises:

the first end of connecting rod with test the electrical head and link to each other, the second end of connecting rod with insulating handle links to each other.

10. The test pencil of claim 9 wherein the connecting rod comprises:

the first end of the first connecting rod is connected with the electroscope head;

the first end of the second connecting rod is connected with the first connecting rod through a first rotating shaft;

and the first end of the third connecting rod is connected with the second connecting rod through a second rotating shaft, and the second end of the third connecting rod is connected with the insulating handle.