CN105137157B - Alternating current-direct current high voltage testing device - Google Patents

Abstract

The AC/DC high-voltage electrometry device provided by the invention includes a processor, an electrometry unit, a voltage level judging unit, a probe for inducting charges, and an AC judging unit for detecting the magnetic field of high-voltage equipment; the AC/DC high-voltage inspection unit provided by the invention The electrical device can test both AC and DC, and is suitable for existing AC-DC high-voltage equipment and new ultra-high-voltage DC transmission equipment. It can also detect the voltage level of the equipment while testing whether the equipment is live, especially suitable for When the voltage level of the equipment to be tested is unknown, it can be widely applied to power equipment or cables of all voltage levels, and the invention has strong applicability, safety and portability.

Description

AC and DC high voltage electroscope

technical field

The invention relates to the field of electric power, in particular to an AC/DC high-voltage electroscope.

Background technique

In recent years, with the development of my country's economy, the modernization of the power industry, which is the lifeblood of the national economy, has shown increasing importance. People's demand for and dependence on electricity is increasing day by day, and ensuring the safe and reliable operation of the power supply system has become the primary task of the power management department.

An electroscope is an instrument for detecting whether an object is electrified and roughly estimating the amount of electrification. It is divided into a low-voltage electroscope and a high-voltage electroscope. It is used to test high-voltage electrical equipment with a voltage of more than 250V to the ground. In the prior art, high-voltage electroscopes can only perform live detection on equipment with nominal voltage levels. Different voltage levels require different electroscopes, and for AC and DC , Different electroscopes are also required, and when using the electroscope, attention must be paid to its rated voltage and the voltage level of the electrical equipment being tested, otherwise it may endanger the safety of the electroscope and the operator or cause misjudgment.

Contents of the invention

In view of this, the present invention provides an AC/DC high-voltage electrical inspection device to solve the above problems.

The AC/DC high-voltage electrical testing device provided by the present invention includes a processor, an electrical testing unit, a voltage level judging unit, a probe for inducting charges, and an AC judging unit for detecting the magnetic field of high-voltage equipment;

The probe is connected to an electric testing unit, the electric testing unit is connected to a voltage level judging unit, the voltage level judging unit is connected to a processor, and the alternating current judging unit is connected to a processor;

The probe generates charges when it is close to the object under test, the voltage level is measured by the electrometry unit and the voltage level judging unit, and whether the object under test is judged as AC or DC by the AC judging unit.

Further, the voltage level judging unit includes a light source, a grating and a photoelectric sensor for detecting the opening angle of the aluminum foil in the electroscope.

Further, the electroscope unit includes an electroscope and a charge amplifier, the electroscope is connected to the voltage level judging unit, and the charge amplifier is connected to the processor.

Further, the alternating current judging unit is a Hall sensor.

Further, an alarm module is also included, and the alarm module is connected with the processor.

Further, a wireless transmission module is also included, and the wireless transmission module is connected with the processor.

Further, it also includes a self-checking unit and a switch for switching between self-checking and testing functions.

Further, it also includes an insulating rod used to prevent breakdown and discharge of the high-voltage end when holding the handle

Beneficial effects of the present invention: the AC/DC high-voltage electrometer provided by the present invention can test both AC and DC, and is suitable for existing AC-DC high-voltage equipment and new ultra-high voltage DC transmission equipment, and can detect whether the equipment is charged or not. At the same time, it can also detect the voltage level of the equipment, especially suitable for the situation when the voltage level of the equipment to be tested is unknown, and can be widely applied to electric equipment or cables of all voltage levels. The present invention has strong applicability, safety, and portability Features.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

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

Fig. 2 is a structural schematic diagram of the present invention.

Fig. 3 is a schematic diagram of the principle of the voltage level judging unit of the present invention.

detailed description

As shown in Figures 1 and 2, the AC/DC high-voltage electrical inspection device in this embodiment includes a processor, an electrical inspection unit 2, a voltage level judging unit, a probe 1 for inducting charges, and an AC current generator for detecting the magnetic field of high-voltage equipment. judging unit;

The probe 1 is connected to an electric testing unit, the electric testing unit 2 is connected to a voltage level judging unit, the voltage level judging unit is connected to a processor, and the alternating current judging unit is connected to a processor;

The probe 1 generates charges when it is close to the measured object, the voltage level is measured by the electric test unit 2 and the voltage level judgment unit, and the alternating current judgment unit is used to judge whether the measured object is AC or DC, which can be widely used in electric power of all voltage levels equipment or cables.

As shown in FIG. 3 , in this embodiment, the voltage level judging unit includes a light source, a grating and a photoelectric sensor for detecting the opening angle of the aluminum foil in the electroscope. When the electroscope is close to the object to be measured, the probe will induce a certain amount of charge, and the aluminum foil connected to it in the electroscope will repel each other because of the same kind of charge to form an angle, and the two symmetrical light sources will be reflected to the grating. On the photocell, the reflected light passes through the grating and the photocell receives the light signal to measure the size of the included angle. Since the opening angle is positively correlated with the voltage level, the voltage level of the measured object can be judged by measuring the angle of the opening angle.

In this embodiment, the electroscope unit 2 includes an electroscope and a charge amplifier, the electroscope is connected to the voltage level judging unit, and the charge amplifier is connected to the processor. The charge amplifier in this embodiment is composed of several parts such as a charge conversion stage, an adjustment stage, a low-pass filter, a high-pass filter, a final power amplifier, and a power supply. The charge amplifier converts the weak charge into a voltage proportional to it, and Change the high output impedance to low output impedance, supplement and correct the electroscope, and convert it into the corresponding voltage level according to the aluminum foil opening angle of the electroscope.

In this embodiment, the AC judging unit adopts the Hall sensor 5, as shown in Figure 2, the Hall sensor 5 is installed on the probe, when the probe 1 is close to the device under test with AC, the induced magnetic field generated when the AC signal is running makes the The Hall sensor senses the voltage, and then it can be judged whether the measured object has DC or AC.

In this embodiment, an alarm module is also included, and the alarm module is connected with the processor. When the measured object is electrified, the alarm module will send out an alarm. The alarm mode can use sound and light alarm or other methods to remind the operator.

In this embodiment, a wireless transmission module is also included, and the wireless transmission module is connected with the processor. Through the wireless transmission module, it can communicate with the mobile phone of the electric inspection staff and the electric inspection guardian, send relevant information, and transmit the data remotely, which is convenient for online monitoring and recording.

In this embodiment, it also includes a self-test unit and a switch for switching self-test and detection functions. The self-test unit in this embodiment is provided with a self-test button. When the self-test button is pressed, the alarm module will generate Regular sound and light alarm signals indicate that the electroscope is in a normal and usable state, otherwise it means that the electroscope is faulty and cannot be used.

In this embodiment, it also includes an insulating rod 3 for preventing breakdown discharge at the high-voltage end when holding the handle 4. By holding the handle 4, the probe 1 slowly approaches the measured object, and the insulating rod 3 can effectively prevent the high-voltage end from breakdown discharge.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (6)

1. An AC/DC high-voltage electrical inspection device, characterized in that: comprising a processor, an electrical inspection unit, a voltage level judging unit, a probe for inductive charge and an alternating current judging unit for detecting the magnetic field of a high-voltage device; The probe is connected to an electric testing unit, the electric testing unit is connected to a voltage level judging unit, the voltage level judging unit is connected to a processor, and the alternating current judging unit is connected to a processor; The probe generates charges when it is close to the measured object, the voltage level is measured by the electrometry unit and the voltage level judgment unit, and the alternating current judgment unit is used to judge whether the measured object is AC or DC; The voltage level judging unit includes a light source, a grating and a photoelectric sensor for detecting the opening angle of the aluminum foil in the electroscope; The AC judging unit is a Hall sensor. 2. The AC/DC high-voltage electroscope device according to claim 1, characterized in that: the electroscope unit includes an electroscope and a charge amplifier, the electroscope is connected to a voltage level judging unit, and the charge amplifier is connected to a processor connect. 3. The AC/DC high-voltage electrical inspection device according to any one of claims 1-2, further comprising an alarm module connected to the processor. 4. The AC/DC high voltage electroscope according to claim 3, further comprising a wireless transmission module connected to the processor. 5. The AC/DC high-voltage electroscope according to claim 1, further comprising a self-inspection unit and a switch for switching between self-inspection and detection functions. 6. The AC/DC high-voltage electroscope according to claim 3, further comprising an insulating rod for preventing breakdown and discharge at the high-voltage end when holding the handle.