CN110058072A - A kind of electroscope with contact detection - Google Patents

Abstract

The invention relates to an electroscope with contact detection, which is used to detect whether there is a working voltage on electrical equipment. The voltage electroscope includes a high-voltage electroscope device and a detection device. The body and the detection circuit arranged inside the body, the detection circuit includes a first electrode contact, a second electrode contact, a third electrode contact, a current limiting resistor, an isolated optocoupler, a light-emitting diode, a power supply and a voltage divider resistor, the first electrode contact, the current limiting resistor, the illuminator of the isolated optocoupler and the second electrode contact are connected in sequence, and the power supply, the photoreceiver of the isolated optocoupler, the light emitting diode and the voltage divider resistor are connected in sequence form a loop. Compared with the prior art, the present invention has the advantages of contact detection, convenient measurement and the like.

Description

An electroscope with contact detection

technical field

The invention relates to a working voltage testing device on electrical equipment, in particular to a testing device capable of identifying safe and dangerous voltages.

Background technique

An electroscope is an instrument that detects whether an object is charged and roughly estimates the amount of charge. The high-voltage electroscope is a high-voltage equipment whose main test equipment has a ground voltage of more than 1000V. At present, the well-known high-voltage electroscope is composed of three parts, namely the detection part, the insulating part and the handshake part. There are three widely used in the market: luminous type, sound and light type and windmill type. When the operator touches the contact electrode of the electroscope to the measured object, when the measured object has a relatively high voltage relative to the ground, different types of electroscopes will prompt the operator whether the measured object is charged in different ways.

At present, most of the high-voltage electroscopes on the market are equipped with self-testing tests, which can be used to judge the quality of the electroscope through the self-testing module. However, most high-voltage electroscopes do not have a module to ensure that the electroscope contact electrodes and the measured object are in correct contact. This is likely to cause misjudgment by the operator, resulting in an error in the detection result. At this time, if the maintenance personnel directly repair the measured object, it may cause casualties.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an electroscope with contact detection in order to overcome the above-mentioned defects of the prior art.

The object of the present invention can be realized through the following technical solutions:

An electroscope with contact detection is used to detect whether a working voltage exists on electrical equipment, the voltage electroscope includes a high-voltage electroscope device and a detection device, and the detection device includes a body installed at the front end of the high-voltage electroscope device and A detection circuit arranged inside the body, the detection circuit includes a first electrode contact, a second electrode contact, a third electrode contact, a current limiting resistor, an isolation optocoupler, a light-emitting diode, a power supply and a voltage divider resistor. The first electrode contact, the current limiting resistor, the light-emitting device of the isolation optocoupler and the second electrode contact are connected in sequence, and the power supply, the photoreceptor of the isolated optocoupler, the light-emitting diode and the voltage dividing resistor are connected in sequence to form a loop, The first electrode contact and the second electrode contact are in contact with the surface of the electrical equipment to be tested, one end of the third electrode contact is connected between the current limiting resistor and the light-emitting device of the isolated optocoupler, and the other end Connect with the high voltage test device.

The body is a U-shaped structure with an opening at the bottom, the first electrode contact and the second electrode contact are respectively arranged on the two tops of the U-shaped structure, and the high-voltage electricity testing device extends into the U-shaped structure. The lower opening is electrically connected to the third electrode contact.

The high-voltage electrical inspection device includes a handle, an insulating member and an indicator which are connected in sequence, and the contact electrode of the indicator is connected to the other end of the third electrode contact through an extension section.

The handle is covered with a hand guard and a polytetrafluoroethylene anti-skid insulating layer, and the outer surface of the polytetrafluoroethylene anti-skid insulating layer is provided with a spiral anti-skid pattern.

The insulating member is provided with limit marks.

The electrical equipment includes wires.

The model of the isolated optocoupler is TLP521 linear optocoupler.

The handle is a hollow telescopic handle.

The two top ends of the U-shaped structure are respectively provided with hooks or fixing clips connected with the first electrode contact and the second electrode contact.

Compared with the prior art, the present invention has the following advantages:

1. Contact detection: by adding a contact detection device on the top of the original high-voltage electroscope, the present invention can not only overcome the inability of the existing high-voltage electroscope to detect whether the contact electrode of the electroscope is in contact with the measured object correctly, but also ensures that the contact electrode The correct contact with the measured object can effectively ensure the safety of the measurement, and can also perform high-voltage electrical inspection. The structure is simple, the quality is low, the cost is low, the operation is convenient, and the occurrence of human accidents is effectively reduced.

2. Convenient measurement: The present invention is provided with hooks or fixing clips at the two top ends of the U-shaped structure, which can be conveniently and effectively physically fixed to the object to be measured, and can more accurately determine whether there is contact with the contact detection, thereby increasing reliability.

Description of drawings

Figure 1 is a schematic diagram of the detection circuit.

FIG. 2 is a connection diagram of the detection device and the electric wire.

FIG. 3 is a structural diagram of a high-voltage electrical inspection device.

FIG. 4 is a structural diagram of the assembly and use of the present invention.

Description of marks in the figure:

1-indicator, 2-limit mark, 3-insulation, 4-handguard, 5-handle, 6-extension 7-contact electrode, 8-foil.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example

As shown in Figures 1-4, the present invention adds a detection device in front of the electrode contacts of a general high-voltage electroscope to judge whether the measured object is in effective contact. The detection circuit of the detection device includes a current limiting resistor, an isolation optocoupler, a light-emitting diode and a power module. When the user uses the electroscope to touch the wire, the detection circuit of the electroscope will first determine whether the electroscope has really touched the wire. When the wire is touched, the LED light of the electroscope detection circuit will light up, indicating that the electroscope and the The wires are in good contact, and then the back end of the electroscope can detect if the wires are live.

The working principle of the present invention is as follows:

When the two top ends of the U-shaped body of the electroscope are in contact with the wire, the first electrode contact and the first electrode contact in the detection circuit will both be in contact with the wire, and the current will first pass through the current limiting resistor and then enter the illuminator of the optocoupler. The optocoupler will isolate this part of the electricity and generate a light signal, and then the light receiver will receive the light signal and convert it into an electrical signal, and finally the light-emitting diode will be lit, which proves that the electroscope is in good contact with the wire.

When the detection device confirms that the wires are in good contact, the electroscope works, and when the object to be tested contacts the electrode contacts, the electric charge carried by itself will be transferred to the foil of the indicator in the high-voltage electroscope. Since the same charges repel each other, the foils will automatically separate and stretch at an angle. According to the size of the angle between the two foils, the size of the charged amount of the object can be estimated. Then, according to the types of different high-voltage electroscopes, there are different prompting methods. The luminous electroscope can be used. When there is electricity, the electroscope will light up to remind the user that the measured object is charged. In addition, sound and light type and wind type high voltage are commonly used. electroscope.

Claims (9)

1. a kind of electroscope with contact detection, to detect on electrical equipment with the presence or absence of operating voltage, which is characterized in that The voltage electroscope includes high voltage testing device and detection device, and the detection device includes before being mounted on high voltage testing device The ontology at end and the detection circuit that body interior is arranged in, the detection circuit include first electrode contact, second electrode Contact, third electrode contacts, current-limiting resistance, isolation optocoupler, light emitting diode, power supply and divider resistance, the first electrode Contact, current-limiting resistance, the photophore of isolation optocoupler and second electrode contact are sequentially connected, the power supply, isolation optocoupler by Light device, light emitting diode and divider resistance are in turn connected to form circuit, the first electrode contact and second electrode contact with Electrical equipment surface contact to be measured, described third electrode contacts one end is linked into the photophore of current-limiting resistance and isolation optocoupler Between, the other end is connect with high voltage testing device.

2. a kind of electroscope with contact detection according to claim 1, which is characterized in that the ontology is lower part The U-shaped structure of opening, the first electrode contact and second electrode contact are separately positioned on two tops of U-shaped structure, institute The lower openings that the high voltage testing device stated protrudes into U-shaped structure are electrically connected with third electrode contacts.

3. a kind of electroscope with contact detection according to claim 1, which is characterized in that the high voltage testing dress It sets including sequentially connected handle, insulating part and indicator, the contact electrode of the indicator passes through extension and third electrode The other end of contact connects.

4. a kind of electroscope with contact detection according to claim 3, which is characterized in that be arranged on the handle Handguard and the anti-skidding insulating layer of polytetrafluoroethylene (PTFE), the anti-skidding insulating layer outer surface of the polytetrafluoroethylene (PTFE) are equipped with spiral anti-skid chequer.

5. a kind of electroscope with contact detection according to claim 3, which is characterized in that set on the insulating part Limited mark.

6. a kind of electroscope with contact detection according to claim 1, which is characterized in that the electrical equipment packet Include electric wire.

7. a kind of electroscope with contact detection according to claim 1, which is characterized in that the isolation optocoupler Model TLP521 linear optical coupling.

8. a kind of electroscope with contact detection according to claim 3, which is characterized in that the handle is hollow Telescoping handle.

9. a kind of electroscope with contact detection according to claim 2, which is characterized in that the U-shaped structure Two tops are respectively equipped with the hook or fixing clamp connecting with first electrode contact and second electrode contact.