Grounding device capable of measuring grounding resistance of distribution transformer in live line

Abstract

The utility model relates to the technical field of resistance measurement, in particular to a grounding device capable of live-line measurement of grounding resistance of a distribution transformer. The grounding device comprises a main grounding electrode, an auxiliary grounding electrode, a connecting plate, a main grounding grid and an auxiliary grounding grid; the connecting plate is provided with four connecting holes which are sequentially connected with the main grounding electrode, a working grounding down lead of the distribution transformer, a protection grounding down lead of the distribution transformer and the auxiliary grounding electrode; one end of the main grounding electrode is connected with the connecting plate, and the other end is connected with the main grounding grid; one end of the auxiliary grounding electrode is connected with the connecting plate, and the other end is connected with the auxiliary grounding grid. The grounding device does not influence the grounding protection operation of the transformer when the grounding electrode protection on any side is removed, meets the condition of grounding resistance measurement, can achieve the measurement of the grounding resistance of the transformer in an electrified manner, can reduce the power failure caused by the measurement of the grounding resistance of the transformer, and improves the power supply reliability of a power grid.

Description

TECHNICAL FIELD

[0001] The utility model relates to the resistance measurement technical field, especially relates to a ground device of can live measurement distribution transformer grounding resistance. BACKGROUND

[0002] Distribution transformer is an important part of industrial production, civilian power, and its reliable operation cannot leave various protection measures. Grounding electrode as an important safety protection measure in transformer operation plays an important role in preventing excessive current, electric shock and fire, etc. Therefore, it is very important to periodically measure the grounding resistance of distribution transformer to ensure that the grounding resistance value is within the specified range.

[0003] In the distribution transformer station, the grounding system is divided into working grounding, protection grounding and lightning protection grounding. According to the provisions of the distribution line operation regulation, the grounding resistance value of distribution transformer should be measured periodically, and the grounding resistance should meet the corresponding resistance value requirement according to the different transformer capacity, so as to ensure that the grounding system can play a role.

[0004] At present, the grounding device for measuring the grounding resistance of distribution transformer is designed in one piece, and the above-ground grounding electrode is divided into two grounding electrodes and one grounding electrode. If it is necessary to measure the grounding resistance of the grounding body, it is necessary to first cut off the power supply of the distribution transformer, disconnect the connection between the transformer and the grounding device, and use the grounding resistance tester for wiring and measurement. Since the transformer needs to be cut off before measurement, it will cause the high and low voltage users supplied by the transformer to be cut off, which will affect the power supply reliability. Therefore, a new type of grounding device is needed to realize the live measurement of the grounding resistance of distribution transformer and ensure that the transformer does not lose the protection of the grounding system during measurement, so as to reduce the power cut caused by measuring the grounding resistance of the transformer and improve the power supply reliability of the power grid. Utility model content

[0005] The utility model aims at overcoming the defects of prior art, and provides a grounding device for live measurement of the grounding resistance of distribution transformer, which can realize live measurement of the grounding resistance of transformer.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following specific technical scheme:

[0007] The grounding device capable of measuring the grounding resistance of the distribution transformer under electrification provided by the utility model comprises a main grounding pole, an auxiliary grounding pole, a connecting plate, a main grounding net and an auxiliary grounding net.

[0008] Preferably, the main grounding pole and the auxiliary grounding pole are both made of iron, and the main grounding pole and the auxiliary grounding pole are both connected with the connecting plate through M12*30 bolts.

[0009] Preferably, the connecting plate is made of galvanized flat steel material, and has a size of L1800 and a circular connecting hole; the main grounding net and the auxiliary grounding net each have a length of 3 meters, and 2.5-meter galvanized flat steel is arranged every 0.6 meters.

[0010] The utility model can achieve the following technical effects:

[0011] The grounding device provided by the utility model can realize the measurement of the grounding resistance of the transformer under electrification, has low cost, is convenient to install, is reliable in connection, and can measure the grounding resistance of the main grounding pole when the bolt of the main connection end of the connecting plate is removed and insulating gloves are worn; the auxiliary grounding pole is measured in the same way; the grounding device does not affect the operation of the transformer grounding protection when any side grounding pole protection is removed, can meet the condition of the grounding resistance measurement, can be used skillfully through simple training, can reduce the power failure caused by the measurement of the transformer grounding resistance, and improves the power supply reliability of the power grid. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic view of the grounding device capable of measuring the grounding resistance of the distribution transformer under electrification provided by the utility model embodiment;

[0013] Figure 2 is an exploded structural view of the grounding device capable of measuring the grounding resistance of the distribution transformer under electrification provided by the utility model embodiment.

[0014] The reference signs in the drawings include:

[0015] The connecting plate 1, the main grounding pole 2, the auxiliary grounding pole 3, the main grounding net 4, the auxiliary grounding net 5, the main connection end 6, the auxiliary connection end 7, the working grounding down lead 8 and the protection grounding down lead 9. DETAILED DESCRIPTION

[0016] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. In the following description, the same modules are denoted by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0017] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not constitute a limitation on the present application.

[0018] The grounding device for measuring the grounding resistance of a distribution transformer while live is provided by the embodiment of the present application, which has a structure as shown in Figure 1 and an exploded structural view as shown in Figure 2 and comprises a connecting plate 1, a main grounding pole 2, an auxiliary grounding pole 3, a main grounding net 4 and an auxiliary grounding net 5.

[0019] The connecting plate 1 is provided with four connecting holes, two connecting holes at the ends of the connecting plate are a main connecting end 6 and an auxiliary connecting end 7 respectively, and the main connecting end 6 and the auxiliary connecting end 7 are connected to the main grounding pole 2 and the auxiliary grounding pole 3 respectively through bolts; the connecting hole of the connecting plate 1 near the main connecting end 6 is connected to the working grounding down lead 8 of the distribution transformer, and the connecting hole of the connecting plate 1 near the auxiliary connecting end 7 is connected to the protective grounding down lead 9 of the distribution transformer.

[0020] One end of the main grounding pole 2 is connected to the main connecting end 6 of the connecting plate 1, and the other end is connected to the main grounding net 4; one end of the auxiliary grounding pole 3 is connected to the auxiliary connecting end 7 of the connecting plate 1, and the other end is connected to the auxiliary grounding net 5.

[0021] The main grounding pole 2 and the auxiliary grounding pole 3 are both made of iron, and the main grounding pole 2 and the auxiliary grounding pole 3 are both connected to the connecting plate 1 through M12*30 bolts. The connecting plate 1 is made of galvanized flat steel material, and the size is L1800, and the four connecting holes are circular connecting holes. The length of the main grounding net 4 and the auxiliary grounding net 5 is 3 meters, and 2.5-meter galvanized flat steel is arranged every 0.6 meters, and there are 6 pieces in total.

[0022] The steps of measuring the grounding resistance of the distribution transformer using the above grounding device are as follows:

[0023] First, the connecting plate 1 is removed, the joint bolt at the main connecting end 6 connected to the main grounding pole 2 is removed, the grounding down lead of the distribution transformer is disconnected from the main grounding pole 2, at this time, the auxiliary grounding net 5 connected to the auxiliary grounding pole 3 of the distribution transformer meets the grounding protection operation, and the main grounding pole 2 can be measured for the grounding resistance;

[0024] Then the bolt connection of the main grounding electrode 2 on the connecting plate 1 is restored, the connecting plate 1 is removed, the auxiliary connecting end 7 of the auxiliary grounding electrode 3 is connected, the contact bolt is removed, the distribution transformer is protected by the main grounding net 4 connected by the main grounding electrode 2, and at this time, the grounding resistance of the auxiliary grounding electrode 3 can be measured.

[0025] The above measurement step retains the main grounding net or the auxiliary grounding net, meets the grounding requirement, measures the removed grounding net, realizes that the removal of any side grounding electrode protection does not affect the operation of the transformer grounding protection, simultaneously meets the grounding resistance measurement condition, and realizes the purpose of measuring the grounding resistance in the case of the transformer under the condition of the above grounding device. Meanwhile, the above grounding device has low cost, is convenient to install, is reliable in connection, insulating gloves are worn during measurement, the bolt of the main connecting end of the connecting plate is removed, the grounding resistance of the main grounding electrode can be measured, and the measurement principle of the auxiliary grounding electrode is consistent with that of the main grounding electrode. The grounding device has low cost of about 850 yuan per set, the use method can be mastered through simple training, power outage caused by measurement of the transformer grounding resistance is avoided, and power grid power supply reliability is improved.

[0026] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0027] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. The person skilled in the art can make changes, modifications, replacements and modifications to the above embodiments within the scope of the present application.

[0028] The specific embodiments of the present application do not constitute a limitation on the protection scope of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A grounding device for electrically measuring the grounding resistance of a distribution transformer, characterized in that, The main grounding electrode, the auxiliary grounding electrode, the connecting plate, the main grounding net and the auxiliary grounding net are included. The connecting plate is provided with four connecting holes, two connecting holes at both ends of the connecting plate are respectively the main connecting end and the auxiliary connecting end, and the main grounding electrode and the auxiliary grounding electrode are connected through bolts respectively; the connecting hole near the main connecting end in the middle of the connecting plate is connected with the working grounding down lead of the distribution transformer, and the connecting hole near the auxiliary connecting end in the middle of the connecting plate is connected with the protection grounding down lead of the distribution transformer; One end of the main grounding electrode is connected with the main connecting end of the connecting plate, and the other end is connected with the main grounding net; one end of the auxiliary grounding electrode is connected with the auxiliary connecting end of the connecting plate, and the other end is connected with the auxiliary grounding net.

2. The grounding device of a chargeable measuring grounding resistance of a distribution transformer according to claim 1, characterized in that, The main grounding electrode and the auxiliary grounding electrode are both made of iron, and the main grounding electrode and the auxiliary grounding electrode are both connected with the connecting plate through M12*30 bolts.

3. The grounding device of a chargeable measuring grounding resistance of a distribution transformer according to claim 1, characterized in that, The connecting plate is made of galvanized flat steel material, the size is L1800, and the connecting hole is a circular connecting hole; the length of the main grounding net and the auxiliary grounding net is 3 meters, and 2.5 meters of galvanized flat steel is arranged every 0.6 meters.

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