CN216285655U

CN216285655U - High-voltage interphase short circuit detection equipment

Info

Publication number: CN216285655U
Application number: CN202122781730.8U
Authority: CN
Inventors: 葛仕康
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-04-12
Anticipated expiration: 2031-11-15

Abstract

The utility model discloses short circuit detection equipment, and relates to the technical field of high-voltage interphase short circuit detection equipment. The utility model comprises a coil, an amplifier, a narrow-band filter circuit, a digital-to-analog converter and a CPU which are electrically connected in sequence; the amplifier is used for amplifying voltage signals generated at two ends of the coil; the narrow-band filter circuit is used for filtering signals out of a specified frequency range; the digital-to-analog converter is used for converting an analog signal into a digital signal and sending the digital signal to the CPU; and the CPU is used for receiving the digital signal and calculating the voltage values at the two ends of the coil. The utility model can carry out detection on the ground by carrying the handheld device, thereby obviously saving a large amount of manpower and time and ensuring the reliability of power supply.

Description

High-voltage interphase short circuit detection equipment

Technical Field

The utility model relates to the technical field of short circuit detection equipment, in particular to high-voltage interphase short circuit detection equipment.

Background

The 10kv power distribution network interphase short circuit is caused by a plurality of reasons, and some phenomena are obvious, such as that a large wind causes light substances of conductors and semiconductors to scrape a line to cause short circuit, and if the light substances are caused by the short circuit, the short circuit can be checked and eliminated by manual line patrol and the like.

However, with the development of economy, the types and the quantities of equipment hung on the distribution lines are more and more, such as transformers, metering boxes and the like. The number of interphase short-circuit accidents caused by equipment is larger and larger, and the causes of the accidents are often invisible and difficult to find. For the problem, the existing solution is to segment the line, then supply power, and remove the fault section by section according to the existence of the fault until the fault is found finally, except for visual line patrol. The method for searching for the fault consumes a great deal of manpower and time.

SUMMERY OF THE UTILITY MODEL

The utility model provides a high-tension electric interphase short circuit detection device, which comprises a coil, an amplifier, a narrow-band filter circuit, a digital-to-analog converter and a CPU which are electrically connected in sequence; the amplifier is used for amplifying voltage signals generated at two ends of the coil; the narrow-band filter circuit is used for filtering signals out of a specified frequency range; the digital-to-analog converter is used for converting an analog signal into a digital signal and sending the digital signal to the CPU; and the CPU is used for receiving the digital signal and calculating the voltage values at the two ends of the coil.

The utility model is further provided with: the number of turns of the coil is 3000 and 6000 turns.

The utility model is further provided with: the diameter of the enameled wire of the coil is 0.14-0.30 mm.

The utility model is further provided with: the display is electrically connected with the CPU, the CPU sends a display signal based on the voltage value to the display, and the display responds to the display signal to display the number of the voltage value.

The beneficial technical effects of the utility model are as follows:

the utility model can carry out detection on the ground by carrying the handheld device, thereby obviously saving a large amount of manpower and time and ensuring the reliability of power supply.

Drawings

FIG. 1 is a schematic structural view of a high voltage interphase short detecting apparatus in the present invention;

FIG. 2 is a schematic view of the internal structure of the high voltage interphase short detecting apparatus of the present invention;

fig. 3 is a schematic diagram of the connection of the components of the high-voltage interphase short-circuit detecting apparatus of the present invention.

Reference numerals: 1. a housing; 2. a coil; 3. a display; 4. a circuit board; 5. an amplifier; 6. a digital-to-analog converter; 7. a CPU; 8. a narrow band filter circuit.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

Referring to fig. 1-3, the present invention provides a high voltage electric interphase short circuit detecting apparatus, including a housing 1, a coil 2, a display 3, a circuit board 4 are arranged in the housing 1, and an amplifier 5, a digital-to-analog converter 6, a CPU7 and a narrow-band filter circuit 8 are welded on the circuit board 4.

The coil 2, the amplifier 5, the narrow band filter circuit 8, the digital-to-analog converter 6, the CPU7, and the display 3 are electrically connected in this order.

First, the theoretical basis of the work is explained: when currents of the same magnitude and opposite directions are applied to the parallel wires, the electromagnetic field intensity at any point in a plane at the same distance from the two wires is 0, but the electromagnetic field intensity at any other point is not 0. This provides a theoretical basis for finding the fault point of the interphase short circuit.

However, the plane in which the electromagnetic field intensity is 0 is theoretically true, and in the field, the point in which the electromagnetic field intensity is not 0 is the most. So that a specific alternating current is input between the two short-circuited phase circuits, the corresponding magnetic field strength can be detected at one point, which provides a direction for the realization of the patent.

The specific working process is as follows: the coil 2 is capable of generating a voltage across its enameled wire in a varying magnetic field. The amplifier 5 is used to amplify the voltage signal generated across the coil 2. The narrow band filter circuit 8 is used to filter out signals outside a specified frequency range. The digital-to-analog converter 6 is used to convert the analog signal to a digital signal and send it to the CPU 7. The CPU7 is used to receive the digital signal and calculate the voltage value across the coil 2. The CPU7 sends a display signal based on the voltage value to the display 3, and the display 3 displays the number of the voltage value in response to the display signal.

Although it is possible to detect the magnetic field intensity, the short-circuited two-phase circuit has opposite current directions and small difference, and the erection height of the electric tower is usually about 10 meters, so that the magnetic field intensity detected by a person standing on the ground is weak.

Therefore, the concrete means for solving the problems are as follows: the number of turns of the coil 2 is 3000 and 6000 turns; the diameter of the enameled wire of the coil 2 is 0.14-0.30 mm. Thus, the magnetic field can be detected, and meanwhile, the total mass is not too large, so that the magnetic field can be conveniently carried. Further, texas instruments AD623 are used as the amplifier 5; the CPU7 is implemented as the ideological semiconductor STM32F407, and is an integrated product with the digital-to-analog converter 6 inside.

A more elegant design of this is the use of a narrow band filter circuit 8. Because the influence of the low-frequency environment magnetic field and the influence of the magnetic field of other normal wires are considered, the narrow-band filter circuit 8 is used for filtering the signal of 60 +/-5 Hz so as to improve the accuracy of detection.

In specific use, a 60Hz alternating current is input between the two circuits for detection, and then a person detects the cable directly below the cable. When the display 3 shows a voltage of 9-11 microvolts it is indicated that 60Hz alternating current is present in the cable above the test person, and when the display 3 shows 0 microvolts it is indicated that 60Hz alternating current is not present in the cable above the test person. There must be a point where there is 60Hz alternating current on one side and no 60Hz alternating current on the other side, which is then the short-circuit fault point. Further, the position where the fault point exists can be found based on the indication of the display 3.

The length of the 10kv distribution line is from several kilometers to dozens of kilometers, and it is difficult to find the point by methods such as manual line patrol and the like. The utility model can carry out detection on the ground by carrying the handheld device, thereby obviously saving a large amount of manpower and time and ensuring the reliability of power supply.

While the utility model has been described with reference to a preferred embodiment, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model, and particularly, features shown in the various embodiments may be combined in any suitable manner without departing from the scope of the utility model. It is intended that the utility model not be limited to the particular embodiments disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the utility model, and the technical scheme after the changes or substitutions can fall into the protection scope of the utility model.

Claims

1. The utility model provides a high-tension electricity looks short circuit detection equipment which characterized in that: the device comprises a coil (2), an amplifier (5), a narrow-band filter circuit (8), a digital-to-analog converter (6) and a CPU (7) which are electrically connected in sequence;

the amplifier (5) is used for amplifying voltage signals generated at two ends of the coil (2);

the narrow-band filter circuit (8) is used for filtering out signals outside a specified frequency range;

the digital-to-analog converter (6) is used for converting an analog signal into a digital signal and sending the digital signal to the CPU (7);

and the CPU (7) is used for receiving the digital signal and calculating the voltage value at two ends of the coil (2).

2. The high-voltage electrical phase-to-phase short detection apparatus according to claim 1, characterized in that: the number of turns of the coil (2) is 3000-6000 turns.

3. The high-voltage electrical phase-to-phase short detection apparatus according to claim 1, characterized in that: the diameter of the enameled wire of the coil (2) is 0.14-0.30 mm.

4. The high-voltage electrical phase-to-phase short detection apparatus according to claim 1, characterized in that: the display device further comprises a display (3) electrically connected with the CPU (7), the CPU (7) sends a display signal based on the voltage value to the display (3), and the display (3) responds to the display signal to display the number of the voltage value.