CN214097608U

CN214097608U - Non-contact voltage detection system based on electric field frequency

Info

Publication number: CN214097608U
Application number: CN202022373729.7U
Authority: CN
Inventors: 杨志亮
Original assignee: Zhongke Shenzhen Energy Internet Of Things Co ltd
Current assignee: Zhongke Shenzhen Energy Internet Of Things Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-08-31
Anticipated expiration: 2030-10-22

Abstract

The utility model relates to the field of electric power detection, in particular to a non-contact voltage detection system based on electric field frequency; the non-contact voltage detection system comprises an induction unit, a logic unit and a processing unit, wherein the induction unit is used for inducing electric field frequency in a power system, the logic unit is used for converting the electric field frequency into a pulse signal, the processing unit is used for identifying the pulse signal so as to analyze the existence of alternating voltage, the input end of the logic unit is connected with the induction unit so as to obtain the electric field frequency, and the processing unit is connected with the output end of the logic unit so as to obtain the pulse signal; the utility model discloses an utilize induction field frequency to detect alternating voltage's among the electric power system existence, in time discover the trouble to reduce the potential safety hazard, effectively avoided huge economic loss, it need not to destroy the cable and dangerous low, has effectively protected personal safety, also need not to require cable and tablet apart from fixed, makes to use more nimble convenience, and it is difficult to receive the environmental humidity influence, has effectively improved system stability.

Description

Non-contact voltage detection system based on electric field frequency

Technical Field

The utility model relates to an electric power detection field, concretely relates to non-contact voltage detection system based on electric field frequency.

Background

The detection of the existence of the alternating voltage plays an important role in power utilization safety, intelligent operation and maintenance and the like, the traditional alternating voltage measurement method generally adopts a direct contact type detection or contact type voltage reduction electromagnetic isolation detection mode, but in a medium-high voltage or low-voltage alternating current application system, a certain part of scenes cannot directly adopt a wiring mode for voltage measurement, for example, a cable cannot be damaged in transmission, the internal space of an electric box is narrow, or the danger of direct measurement of a medium-high voltage cable is too high, the existing direct contact type detection mode cannot be adopted for voltage detection, however, if the voltage detection cannot be carried out, a fault point cannot be found in time, so that the personal safety is threatened, huge economic loss is caused, and meanwhile, data cannot be actively sent to a background operation and maintenance system to form large data analysis and management, therefore, in some special scenarios, it is necessary to determine whether the ac voltage exists through non-contact detection, and in the prior art, non-contact detection of the ac voltage is achieved through a method of using electric field strength induction, but this method requires that the distance between the cable and the induction plate is relatively fixed, and this method is easily affected by the ambient humidity.

Therefore, it is important to design a non-contact voltage detection system based on electric field frequency, which has no requirement on the distance between the cable and the sensing plate and is not easily influenced by the environment.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a non-contact voltage detection system based on electric field frequency, overcome the defect that exists in the current contact detection technique can't carry out the detection to special scene and the requirement cable that exists among the current non-contact detection technique and tablet distance relatively fixed and receive defects such as ambient humidity influence easily.

The utility model provides a technical scheme that its technical problem adopted is: the non-contact voltage detection system based on the electric field frequency is provided and is used for detecting the existence of alternating voltage in a power system, and the preferable scheme is as follows: the non-contact voltage detection system comprises an induction unit for inducing electric field frequency in a power system, a logic unit for converting the electric field frequency into a pulse signal and a processing unit for identifying the pulse signal to analyze the existence of alternating voltage, wherein the input end of the logic unit is connected with the induction unit to obtain the electric field frequency, and the processing unit is connected with the output end of the logic unit to obtain the pulse signal.

Wherein, the preferred scheme is as follows: the induction unit comprises a metal induction plate for inducing the frequency of an electric field, and the metal induction plate is connected with the input end of the logic unit.

Wherein, the preferred scheme is as follows: the metal induction plate is one of a copper sheet, an iron sheet, a steel sheet or an aluminum sheet.

Wherein, the preferred scheme is as follows: the metal induction plate is a copper-coated sheet on the PCBA board.

Wherein, the preferred scheme is as follows: the logic unit comprises a comparator, the positive pole input end of the comparator is connected with the induction unit to obtain the frequency of the electric field, and the output end of the comparator is connected with the processing unit.

Wherein, the preferred scheme is as follows: the comparator is a zero-crossing comparator.

Wherein, the preferred scheme is as follows: the non-contact voltage detection system further comprises a first filtering unit used for adjusting the sensitivity of the sensing unit and improving the anti-interference capability of the system, and the first filtering unit is arranged between the sensing unit and the input end of the logic unit.

Wherein, the preferred scheme is as follows: the first filtering unit comprises a first resistor and a first capacitor connected with the first resistor in parallel, and the first resistor and the first capacitor are both connected with the input end of the logic unit in parallel.

Wherein, the preferred scheme is as follows: the non-contact voltage detection system further comprises a second filtering unit for improving the anti-interference capability of the system, and the second filtering unit is arranged between the output end of the logic unit and the processing unit.

Wherein, the preferred scheme is as follows: the second filtering unit comprises a second resistor and a second capacitor connected with the second resistor in series.

The beneficial effects of the utility model reside in that, compared with the prior art, the utility model discloses a design a non-contact voltage detection system based on electric field frequency, utilize response electric field frequency to detect alternating voltage's among the electric power system existence, and the trouble is found in time, thereby reduce the potential safety hazard, huge economic loss has effectively been avoided, compare in traditional contact detection mode, it need not to destroy the cable and dangerous low, the personal safety has effectively been protected, compare in current utilization electric field intensity induction mode, it need not to require cable and response board apart from fixed, make to use more nimble convenience, and it is difficult to receive the environmental humidity influence, system stability has effectively been improved.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural diagram of a non-contact voltage detection system based on electric field frequency in the present invention;

FIG. 2-1 is a schematic circuit diagram of the sensing unit and the logic unit of the present invention;

fig. 2-2 is a schematic circuit diagram of a processing unit in the present invention;

fig. 3 is a waveform diagram of an induced ac sine wave signal in accordance with the present invention;

fig. 4 is a waveform diagram of a pulse signal according to the present invention.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1-2, the present invention provides a preferred embodiment of a non-contact voltage detection system based on electric field frequency.

Referring to fig. 1, the non-contact voltage detection system for detecting the presence of an alternating voltage in a power system includes an induction unit 10 for inducing the frequency of the electric field in the power system, a logic unit 20 for converting the frequency of the electric field into a pulse signal, and a processing unit 30 for recognizing the pulse signal to analyze the presence of the alternating voltage, wherein an input end of the logic unit 20 is connected with the induction unit 10 to obtain the frequency of the electric field, and the processing unit 30 is connected with an output end of the logic unit 20 to obtain the pulse signal.

Specifically, in this embodiment, an input end of a logic unit in the non-contact voltage detection system is connected to an induction unit to obtain an electric field frequency and convert the electric field frequency into a pulse signal, and the processing unit is connected to an output end of the logic unit to obtain the pulse signal and identify the pulse signal, so as to analyze and determine whether an alternating voltage exists, where it needs to be noted that the analysis and determination is simple (0 or 1) determination; the utility model discloses an utilize induction electric field frequency to carry out alternating voltage's among the non-contact detection electric power system existence, it is for contact detection mode, need not destroy the cable just in time to discover the trouble, personal safety hidden danger has effectively been reduced, huge economic loss has effectively been avoided, furthermore, it is for the non-contact detection mode of current utilization electric field intensity response, the distance that need not require cable and tablet is fixed, also be difficult for receiving ambient humidity's influence, not only effectively improved the stability of system, it is more convenient still to make the application of this system simultaneously.

Furthermore, the non-contact voltage detection system based on the electric field frequency can also be directly applied to each cable monitoring device as a sub-module, and can also independently take the internet of things communication module to form the cable monitoring device.

Further, and referring to fig. 2-1 and 2-2, the sensing unit 10 includes a metal sensing plate for sensing the frequency of the electric field, which is connected to the input terminal of the logic unit 20.

In this embodiment, the metal induction plate can be a copper sheet, an iron sheet, a steel sheet or an aluminum sheet, etc., wherein the copper sheet has the best effect, the metal induction plate can be made into any area and any shape according to specific needs, and meanwhile, copper clad on the PCBA can be directly used according to design needs, the embodiment can be used as the induction unit only by using a small metal induction plate, and can be matched with the logic unit and the processing unit to judge whether the alternating voltage exists in the detected equipment, because the shape and the volume of the metal induction plate can be randomly set according to needs, the volume of the whole device is effectively reduced, further the occupied space required by the device is reduced, further, because the distance between the induction plate and the detected equipment is not required to be fixed when the metal induction plate is used for inducing the electric field frequency, the metal induction plate can be placed at any angle with the electrified cable, the application of the whole device is more flexible.

Further, and with reference to fig. 2-1 and 2-2, the logic unit 20 comprises a comparator having a positive input connected to the induction unit to acquire the electric field frequency and convert it into a pulse signal, and an output connected to the processing unit 30.

Specifically, the comparator is a zero-crossing comparator, one input end of the integrated operational amplifier is grounded, the other input end of the comparator is connected with a circuit for comparing the voltage of the input voltage, the output voltage jumps near the zero crossing point of the input voltage, and the zero-crossing comparator mainly functions to detect whether an input value is 0 or not.

Further, and referring to fig. 2-1 and 2-2, the non-contact voltage detection system further includes a first filtering unit 40 for adjusting the sensitivity of the sensing unit and improving the anti-interference capability of the system, and the first filtering unit is disposed between the sensing unit 10 and the input end of the logic unit 20.

Specifically, the first filter unit is a normal filter circuit, which is commonly used to filter the ripple in the rectified output voltage, and generally includes a reactance element, such as a capacitor C connected in parallel across a load resistor, or an inductor L connected in series with the load, and various complex filter circuits formed by capacitors and inductors, in this embodiment, the first filter unit 40 includes a first resistor R1 and a first capacitor C1 connected in parallel with the first resistor R1, and the first resistor R1 and the first capacitor C1 are both connected in parallel with the input end of the logic unit 20, and are mainly used to adjust the sensitivity of the induction unit and improve the anti-interference capability of the system.

The resistance value of the first resistor is 4.7K, and the capacitance value of the first capacitor is 0.1 uf.

Further, and referring to fig. 2-1 and 2-2, the contactless voltage detection system further comprises a second filtering unit 50 for improving the immunity of the system against interference, the second filtering unit 50 being arranged between the output of the logic unit 20 and the processing unit 30.

Specifically, the second filtering unit is also a normal filtering circuit, and the second filtering unit 50 includes a second resistor R2 and a second capacitor C2 connected in series with the second resistor R2, and is mainly used for filtering to improve the anti-interference capability of the system.

The second resistance value is 100R, and the second capacitance value is 0.1 uf.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is intended to cover all equivalent changes and modifications made within the scope of the present invention.

Claims

1. A non-contact voltage detection system based on electric field frequency for detecting the presence of an alternating voltage in an electrical power system, characterized by: the non-contact voltage detection system comprises an induction unit for inducing electric field frequency in a power system, a logic unit for converting the electric field frequency into a pulse signal and a processing unit for identifying the pulse signal to analyze the existence of alternating voltage, wherein the input end of the logic unit is connected with the induction unit to obtain the electric field frequency, and the processing unit is connected with the output end of the logic unit to obtain the pulse signal.

2. The contactless voltage detection system according to claim 1, characterized in that: the induction unit comprises a metal induction plate for inducing the frequency of an electric field, and the metal induction plate is connected with the input end of the logic unit.

3. The contactless voltage detection system according to claim 2, characterized in that: the metal induction plate is one of a copper sheet, an iron sheet, a steel sheet or an aluminum sheet.

4. The contactless voltage detection system according to claim 2, characterized in that: the metal induction plate is a copper-coated sheet on the PCBA board.

5. The contactless voltage detection system according to claim 1, characterized in that: the logic unit comprises a comparator, the positive pole input end of the comparator is connected with the induction unit to obtain the frequency of the electric field, and the output end of the comparator is connected with the processing unit.

6. The contactless voltage detection system according to claim 5, characterized in that: the comparator is a zero-crossing comparator.

7. The contactless voltage detection system according to claim 1, characterized in that: the non-contact voltage detection system further comprises a first filtering unit used for adjusting the sensitivity of the sensing unit and improving the anti-interference capability of the system, and the first filtering unit is arranged between the sensing unit and the input end of the logic unit.

8. The contactless voltage detection system according to claim 7, characterized in that: the first filtering unit comprises a first resistor and a first capacitor connected with the first resistor in parallel, and the first resistor and the first capacitor are both connected with the input end of the logic unit in parallel.

9. The contactless voltage detection system according to claim 1, characterized in that: the non-contact voltage detection system further comprises a second filtering unit for improving the anti-interference capability of the system, and the second filtering unit is arranged between the output end of the logic unit and the processing unit.

10. The contactless voltage detection system according to claim 9, characterized in that: the second filtering unit comprises a second resistor and a second capacitor connected with the second resistor in series.