CN215339990U

CN215339990U - Meter pen head for checking direct current grounding

Info

Publication number: CN215339990U
Application number: CN202120578664.1U
Authority: CN
Inventors: 詹林生; 徐国辉; 康日兆; 许元科; 卫乐; 陈艳
Original assignee: Electrification Engineering Co Ltd of China Railway 17th Bureau Group Co Ltd
Current assignee: Electrification Engineering Co Ltd of China Railway 17th Bureau Group Co Ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-12-28
Anticipated expiration: 2031-03-22

Abstract

The utility model belongs to the technical field of electrical measurement, and particularly relates to a meter pen point for checking direct current grounding. The utility model provides an inspection direct current ground connection's table pen point, includes electrically conductive cover, permanent magnet, lead wire and protective housing, and permanent magnet places in electrically conductive cover, and the one end welding of electrically conductive cover has the lead wire, has the protective housing outside electrically conductive cover, and the lead wire is drawn forth from the protective housing, and the protective housing is exposed to the other end of electrically conductive cover. The pen point attracting device is simple in structure and convenient to use, when direct current grounding is checked, the pen point attracting device can be firmly attracted by the aid of the neodymium iron boron strong magnet, operation is simple, and particularly in a narrow space, operation can be very conveniently carried out by one person, and labor cost is saved. The pen point of the meter is plated with tin or zinc, so that the contact reliability can be ensured. The utility model adds the function of the pen point of the meter on the basis of the original multimeter and does not modify the multimeter.

Description

Meter pen head for checking direct current grounding

Technical Field

The utility model belongs to the technical field of electrical measurement, and particularly relates to a meter pen point for checking direct current grounding.

Background

At present, electrical equipment such as a high-voltage cabinet and an isolating switch in an electric power system needs to be controlled by direct current, and various types of protection devices in a transformer substation also need direct current power supplies which are provided by direct current screens. The direct-current power supply of the transformer substation generally has two voltage levels of direct current 110V and direct current 220V, and if the voltage is the voltage of direct current 110V, the voltage of the anode to ground and the voltage of the cathode to ground are both 55V under normal conditions; if the voltage is direct current 220V, the anode voltage to ground and the cathode voltage to ground are both 110V under normal conditions. A common fault in a dc system is dc ground, and when a dc ground fault occurs, it is necessary to check a positive electrode voltage to ground and a negative electrode voltage to ground, and determine a position of the dc ground according to the measured voltages. Generally measure with the universal meter, when using the universal meter, a pen-shape metre ground connection of universal meter, another pen-shape metre is measured at suspicious point respectively, need take one person the universal meter, take one person the pen-shape metre in addition and measure. In the operation process of reality, because direct current screen or other screen cabinet wiring part spaces are narrow and small, two people's operations are difficult for the cooperation, and work efficiency is low, and two people work simultaneously in addition, cause artificial waste.

Disclosure of Invention

The present invention is directed to solving the above-mentioned problems of the prior art and to providing a stylus head for checking dc ground. Because the grounding parts to be measured are all made of ferrous materials, the permanent magnet is arranged in the pen point of the meter, the pen point of the meter can be firmly attracted on the metal surface of the screen cabinet, and corresponding inspection work can be finished by only one person.

The utility model is realized by the following technical scheme: the utility model provides an inspection direct current ground connection's table pen point, includes electrically conductive cover, permanent magnet, lead wire and protective housing, and permanent magnet places in electrically conductive cover, and the one end welding of electrically conductive cover has the lead wire, has the protective housing outside electrically conductive cover, and the lead wire is drawn forth from the protective housing, and the protective housing is exposed to the other end of electrically conductive cover.

When the direct current grounding is checked, a negative polarity pen of the general multimeter is grounded, namely a black pen is grounded, and a positive polarity pen of the multimeter is used for measuring the voltage of a suspicious point, namely a red pen is used for measuring the voltage of the suspicious point. When the direct-current grounded meter pen point is used for checking, the meter pen point is grounded, namely, the exposed part of the conductive cover of the meter pen point is attracted on the metal surface of a nearby screen cabinet, the attracted metal surface is required to be a galvanized surface or a metal surface with good conductivity and cannot be attracted on a paint layer on the surface of the screen cabinet, the contact of the meter pen point is ensured to be reliable, a lead at one end of the meter pen point is connected into a negative electrode of a multimeter, and the other red meter pen is used originally and is used for carrying out voltage measurement at suspicious points respectively. Therefore, when the direct current grounding is checked, one person can check and measure, and after the work is finished, only the pen point of the gauge needs to be pulled down.

In the meter pen point for detecting direct current grounding, the conductive cover is made of thin copper material, and the thickness of the conductive cover is 0.1-0.3 mm.

According to the meter pen head for detecting direct current grounding, the permanent magnet is a cylindrical permanent magnet, and the cylindrical permanent magnet is made of neodymium iron boron strong magnet; the conductive cover comprises a horizontal middle wafer, a pair of symmetrical rod bodies is arranged on the middle wafer, the rod bodies are perpendicular to the middle wafer, the upper ends of the rod bodies on two sides are folded and horizontally bent, the end parts of the upper ends are vertically bent, and a lead is welded on the vertically bent part. The strong magnet of neodymium iron boron can make the pen point of the table firmly attract on the surface of the metal, no matter adsorb on the metal surface perpendicularly, or adsorb on the metal surface horizontally, can guarantee that the pen point of the table attracts together firmly.

Foretell pen point of table of inspection direct current ground connection, the lead wire adopts soft PVC silica gel line, and the inner conductor adopts stranded tinned wire.

According to the meter pen head for detecting direct current grounding, the protective shell is formed by one-time injection molding, and the external color is black. In order to distinguish the test pencil of the multimeter conveniently, the protective shell of the test pencil head for detecting direct current grounding is black.

In the stylus head for inspecting direct current grounding, the vertically bent portion of the conductive cover is soldered by a solder and is soldered to the lead inner conductor.

According to the meter pen point for checking direct current grounding, the conductive cover wafer is plated with tin or zinc, so that poor contact with the metal surface of the screen cabinet caused by patina is avoided.

The pen point attracting device is simple in structure and convenient to use, when direct current grounding is checked, the pen point attracting device can be firmly attracted by the aid of the neodymium iron boron strong magnet, operation is simple, and particularly in a narrow space, operation can be very conveniently carried out by one person, and labor cost is saved. The pen point of the meter is plated with tin or zinc, so that the contact reliability can be ensured. The utility model adds the function of the pen point of the meter on the basis of the original multimeter and does not modify the multimeter.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly introduced, wherein the drawings are used for providing further explanation of the present invention and form a part of the present application, and the exemplary embodiments and the explanation of the present invention are used for explaining the present invention and do not form a limitation to the present invention.

Fig. 1 is a schematic structural diagram of a meter stylus conducting cap for checking dc grounding according to the present invention.

Fig. 2 is a schematic structural diagram of a planar shape of a conductive cap of a stylus pen head for checking direct current grounding according to the present invention.

Fig. 3 is a schematic structural diagram of a permanent magnet of a stylus head for checking dc grounding according to the present invention.

Fig. 4 is a schematic structural view of a dc grounded meter head permanent magnet embedded in a conductive cover according to the present invention.

Fig. 5 is a schematic structural diagram of a protective case for checking dc ground according to the present invention.

Fig. 6 is a schematic diagram of an overall structure of a meter pen head for checking dc ground according to the present invention.

In the figure: 1-conductive cover, 2-permanent magnet, 3-lead wire, 4-protective shell.

Detailed Description

In order that those skilled in the art will better understand the present invention, a more complete and complete description of the present invention is provided below in conjunction with the accompanying drawings and embodiments.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a meter stylus head conductive cover 1 for checking dc ground according to the present invention, and fig. 2 is a schematic structural diagram of a meter stylus head conductive cover 1 for checking dc ground according to the present invention. Processing according to the shape of the figure 2, folding the rod bodies at two sides into the shape of the figure 1, and when the conductive cover 1 is processed, firstly plating tin or zinc on a wafer at the head part of the conductive cover 1, thus ensuring reliable contact of the pen point of the meter. The conductive cover is made of thin copper material, and the thickness of the conductive cover is 0.1-0.3 mm.

Fig. 3 is a schematic structural diagram of a dc-grounded gauge pen head permanent magnet according to the present invention, in which the permanent magnet is a cylindrical permanent magnet 2, the cylindrical permanent magnet 2 is made of a neodymium-iron-boron strong magnet, and the cylindrical permanent magnet 2 is axially magnetized, and the neodymium-iron-boron strong magnet is selected to enable the gauge pen head to be firmly attracted to the metal surface, so that the pen head can be firmly attracted no matter vertically attracted to the metal surface or horizontally attracted to the metal surface. The diameter of the cylindrical permanent magnet 2 is identical to the diameter of the circular piece in the conductive cover 1.

Fig. 4 is a schematic structural diagram of a structure of the utility model for checking that a DC grounded gauge pen head permanent magnet is installed in a conductive cover, a vertical part of the tail of a processed conductive cover 1 is welded by welding tin, and a lead 3 is also welded together. Lead wire 3 adopts soft PVC silica gel line, and the inner conductor adopts stranded tinned wire. The tail part of the conductive cover 1 is welded with a plurality of wires in the lead 3, and then the cylindrical permanent magnet 2 is placed in the conductive cover 1.

Fig. 5 is a schematic structural diagram of a protective case for checking direct current grounding, a protective case 4 is formed by one-time injection molding, a tinned wafer is exposed, a permanent magnet 2 is arranged in a conductive cover 1 according to fig. 4 and then is formed by one-time injection molding with the protective case 4, a lead 3 is led out of the protective case 4 after the formation, and the wafer of the conductive cover 1 is exposed out of the protective case.

Fig. 6 is a schematic diagram of the overall structure of a stylus head for checking dc-ground according to the present invention, wherein the conductive cover 1, the permanent magnet 2, and the internal lead 3 inside the protective casing 4 are shown by dotted lines.

Economic value

The permanent magnet is arranged in the pen point of the meter, the pen point can be firmly attracted on the metal surface of the screen cabinet, corresponding checking work can be completed only by one person, two persons do not need to work simultaneously, and the operation is simple and quick. The technology of the utility model can improve the working efficiency, save time and labor cost.

Technical application

On the basis of the existing multimeter, the multimeter head provided by the utility model is added, so that the defects of the existing multimeter can be overcome, when the direct current grounding is detected by using the multimeter, the detection work can be rapidly finished by one person, and the measurement function of the multimeter is added. At present, the direct current grounding condition sometimes appears in an operating transformer substation, particularly in an operating old transformer substation, so that potential safety hazards can be timely eliminated by rapidly checking direct current grounding.

Claims

1. A kind of inspection direct current earthed gauge outfit, characterized by that: including electrically conductive cover (1), permanent magnet (2), lead wire (3) and protective housing (4), permanent magnet (2) are placed in electrically conductive cover (1), and the one end welding of electrically conductive cover (1) has lead wire (3), has protective housing (4) outside electrically conductive cover, and lead wire (3) are drawn forth from protective housing (4), and the other end of electrically conductive cover exposes protective housing (4).

2. A stylus head for checking dc-ground according to claim 1, wherein: the conductive cover is made of thin copper material, and the thickness of the conductive cover is 0.1-0.3 mm.

3. A stylus head for checking dc-ground according to claim 2, wherein: the permanent magnet (2) is a cylindrical permanent magnet which is made of neodymium iron boron strong magnet; the conductive cover (1) comprises a horizontal middle wafer, a pair of rod bodies with symmetrical positions are arranged on the middle wafer, the rod bodies are perpendicular to the middle wafer, the upper ends of the rod bodies on two sides are folded and horizontally bent, the end parts of the upper ends are vertically bent, and a lead (3) is welded on the vertically bent part.

4. A stylus head for checking dc-earthed meters according to claim 1, 2 or 3, characterized in that: the lead (3) adopts soft PVC silica gel line, and the inner conductor adopts stranded tinned copper wire.

5. A stylus head for checking dc-earthed meters according to claim 1, 2 or 3, characterized in that: the protective shell (4) adopts a one-time injection molding method, and the external color is black.

6. A stylus head for checking dc-ground according to claim 3, wherein: the vertically bent part of the conductive cover (1) is welded with the lead inner conductor by welding tin.

7. A stylus head for checking dc-ground according to claim 6, wherein: the conductive cover (1) wafer is plated with tin or zinc.