CN203838324U - A special test grounding device for secondary winding of high voltage transformer - Google Patents

Abstract

The utility model discloses a special test grounding device for a secondary winding of a high-voltage transformer, which is characterized in that a wiring clamp of a clamping device is specially designed for a secondary winding tap of the high-voltage transformer, and the wiring clamp is of a three-jaw structure and a cambered concave surface design, thereby being capable of stably snapping a wiring screw rod of the secondary winding tap and ensuring the sufficient electrical contact area. A wiring plug and a wiring jack in a patch board are connected by adopting a plugging mode, thereby being convenient and flexible. The number of the used patch boards can be changed freely according to the number of the secondary winding taps of the transformer, thereby enabling the device to be matched with various types and specifications of transformers. A purpose of secondary winding short-circuit grounding required by a test can be easily realized by using the device disclosed by the utility model. Meanwhile, the special test grounding device is safe and reliable, and greatly saves the wiring time. The device adopts a unique plugging type connection mode, is flexible and changeable, and can also assist to complete other electrical items except for realizing a grounding function of the secondary windings.

Description

A special test grounding device for secondary winding of high voltage transformer

technical field

The utility model relates to the technical field of electric high-voltage transformers, in particular to a special test grounding device for secondary windings of high-voltage transformers.

Background technique

At present, there are a large number of power high-voltage transformers operating in the power grid and high-voltage transformers built into power transformer bushings, and their models are also diverse. When carrying out some high-voltage electrical tests on these transformers, most of the experimental items require all or part of the secondary winding of the transformer to be short-circuited to ground.

Due to the unique design and structure of these power high-voltage transformers, the method commonly used by testers is to directly wind the bare copper wire on the tap screw rod (terminal post) of the secondary winding, and connect all the taps one by one before connecting them to the grounding point ( earth) to meet the test requirements of zero potential.

This process is cumbersome and inconvenient and labor-intensive, and the wiring takes a long time and is inefficient. Moreover, the process of winding and removing the wires may cause bifurcation and broken tendons of the bare copper wires. huge security risk.

Therefore, in view of the above situation, how to safely, efficiently and reliably realize the short-circuit grounding of the secondary winding of the power transformer during the high-voltage electrical test has become an important technical problem to be solved urgently by those skilled in the art.

Utility model content

In view of this, the utility model provides a special test grounding device for the secondary winding of the high-voltage transformer, which solves the problem of the short-circuit grounding of the secondary winding during the electrical test of the high-voltage transformer, and saves trouble, time and effort in the actual test work. Effectively improve work efficiency.

In order to achieve the above object, the utility model provides the following technical solutions:

A special test grounding device for the secondary winding of a high-voltage transformer,

Including clamping device and wiring device;

The clamping device includes a terminal clamp, a terminal plug and a connecting wire connected between them, and the terminal clamp has a claw structure for matching with the terminal of the secondary winding;

The wiring device includes an outer casing made of insulating material and a grounding wire. The outer casing is provided with a plurality of wiring jacks for matching with the wiring plug, and each wiring jack is electrically connected to the ground wire.

Preferably, the terminal clip is a three-claw type, and the inner surface of each claw has a circular arc-shaped concave surface.

Preferably, the connection plug is a pin type plug.

Preferably, a wiring board is provided on the outer casing of the wiring device, and a plurality of the wiring sockets are provided on the wiring board.

Preferably, the arrangement of the plurality of connection sockets on the terminal board is the same as the arrangement of the terminals on the secondary winding.

Preferably, the outer casing of the wiring device is in the shape of a dumbbell, and its two ends are respectively a disc-shaped main wiring board and a secondary wiring board, and the wiring jacks are distributed randomly on the main wiring board and the secondary wiring board .

Preferably, the outer peripheral surface of the middle part of the dumbbell-shaped outer shell is provided with a groove structure, which constitutes a wire winding groove capable of winding and accommodating the connecting wire.

It can be seen from the above technical scheme that the special test grounding device for the secondary winding of the high-voltage transformer provided by the utility model can easily realize the short-circuit grounding of the secondary winding required for the test, and at the same time, it is safe and reliable, greatly saving Wiring time. The device is flexible and changeable through a unique plug-in connection method. In addition to realizing the grounding function of the secondary winding, it can also assist in the completion of other electrical test items.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of the clamping device provided by the embodiment of the present invention;

Fig. 2 is a schematic structural diagram of the wiring socket on the wiring device provided by the embodiment of the present invention;

Fig. 3 is a schematic side view of the wiring device provided by the embodiment of the present invention.

Wherein, 11 is a wiring clip, 12 is a connecting wire, and 13 is a wiring plug; 21 is a wiring jack, 22 is a grounding wire, 23 is a main wiring board, 24 is an auxiliary wiring board, and 25 is a winding groove.

Detailed ways

The utility model discloses a special test grounding device for the secondary winding of a high-voltage transformer, which solves the problem of the short-circuit grounding of the secondary winding during the electrical test of the high-voltage transformer, saves trouble, time and effort in actual test work, and effectively improves work efficiency. .

For ease of understanding, the technical terms involved in this solution are explained as follows:

Power high-voltage transformer: In a high-voltage power system, a high-voltage transformer converts high voltage and high current into low voltage and small current in proportion to provide the signals required for measurement and relay protection, and to make measuring instruments and relays Protective devices are standardized. At the same time, the high-voltage transformer isolates the electrical equipment part of the power system at high potential from the measuring instrument and relay protection part at low potential, ensuring the safety of operating personnel and equipment.

Transformer secondary winding: Conductive circuit for flow measurement and relay protection signals in the transformer. In order to facilitate the measurement wiring during installation and test, the secondary winding generally adopts a tapped structure.

Secondary winding short-circuit grounding: When conducting high-voltage electrical tests, the general situation is to apply AC voltage on the high-voltage side of the equipment. At this time, all the corresponding secondary windings of the equipment must be connected to the ground to keep the secondary windings at zero during the test. potential.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Fig. 1 and Fig. 3, Fig. 1 is a schematic structural diagram of the clamping device provided by the embodiment of the utility model; Fig. 2 is a schematic structural diagram of the wiring jack on the wiring device provided by the embodiment of the utility model; Fig. 3 is a schematic diagram of the structure of the clamping device provided by the utility model embodiment; A schematic diagram of the side structure of the wiring device provided by the novel embodiment.

The core improvement point of the special test grounding device for the secondary winding of the high-voltage transformer provided by the embodiment of the utility model is that it includes a clamping device and a wiring device;

The clamping device includes a terminal clip 11, a terminal plug 13 and a connecting wire 12 connected between the two, wherein the connecting clip 11 has a claw structure for matching with the terminal post of the secondary winding, and the connecting wire 12 is an insulated leather-wrapped wires;

The wiring device includes an outer casing made of insulating material and a grounding wire 22 . The outer casing is provided with a plurality of wiring jacks 21 for matching with the wiring plug 13 , and each wiring jack 21 is electrically connected to the grounding wire 22 .

It can be seen from the above technical scheme that the special test grounding device for the secondary winding of the high-voltage transformer provided by the embodiment of the utility model can easily realize the short-circuit grounding of the secondary winding required for the test, and at the same time, it is safe and reliable, greatly Saves wiring time. The device is flexible and changeable through a unique plug-in connection method. In addition to realizing the grounding function of the secondary winding, it can also assist in the completion of other electrical test items.

In order to further optimize the above-mentioned technical solution, the metal conductive terminal clip 11 is a three-claw type, which adopts a spring crimping and fastening structure, and the inner surface of each claw has a circular arc-shaped concave surface, which can satisfy the tap connection with the secondary winding. The screw rod (that is, its cylindrical terminal) is in stable and full contact, and its structure can be shown in Figure 1.

In a specific embodiment of this solution, the connection plug 13 is a needle plug, which is convenient for insertion.

In view of the fact that the secondary winding is usually provided with multiple terminals and needs to be grounded, the outer shell of the wiring device is provided with a terminal board, and the terminal board is provided with a plurality of terminal jacks 21, which are respectively used to pass through multiple terminals. Connected with the clamping device.

In order to further optimize the above-mentioned technical scheme, the arrangement of a plurality of wiring jacks 21 on the wiring board is the same as the arrangement of the binding posts on the secondary winding, so that the connections can be compared one by one, which is convenient for the management of point connections and avoids The scene line is chaotic.

Preferably, the outer casing of the wiring device is in the shape of a dumbbell, and its two ends are respectively a disc-shaped main wiring board 23 and a secondary wiring board 24, and the wiring sockets 21 are scattered and distributed on the main wiring board 23 and the secondary wiring board 24. Usually wiring jack 21 is more as main wiring board 23, is 16 jack designs in this scheme, can basically meet the quantity requirement of current high voltage transformer secondary winding tap; Wiring jack 21 is less auxiliary wiring board 24, and Equipped with a dedicated wire for grounding. The main and auxiliary wiring boards are electrically connected through the built-in conductive part of the middle structure of the wiring device, and have sufficient current conduction capacity, and the outside is wrapped with insulating materials to ensure sufficient insulation strength. With this design, on the one hand, the two can meet the requirements of secondary windings of different specifications, and on the other hand, the grounding test of two sets of secondary windings can be carried out at the same time.

As shown in Figure 3, the outer peripheral surface of the middle part of the dumbbell-shaped outer shell is provided with a groove structure, and the wire winding groove 25 formed can wind and accommodate the connecting wire 12 of the clamping device after the test is finished. This structure design is beautiful and practical.

To sum up, the special test grounding device for the secondary winding of the high voltage transformer provided by the embodiment of the utility model, the connecting clip of the clamping device is specially designed for the tap of the secondary winding of the high voltage transformer, the "three-claw" structure, and the curved The concave surface design can firmly bite the terminal screw rod of the secondary winding tap, and can ensure sufficient electrical contact area. The wiring plug and the wiring jack on the wiring board are connected in a "plug-in" manner, which is convenient and flexible. The number of wiring used can be changed at will according to the number of transformer secondary winding taps, so that it can be matched with various types of transformers. Using this device can easily achieve the purpose of short circuit grounding of the secondary winding required for the test, and at the same time is safe and reliable, greatly saving wiring time. The device is flexible and changeable through a unique plug-in connection method. In addition to realizing the grounding function of the secondary winding, it can also assist in the completion of other electrical test items.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. a high-voltage mutual inductor Secondary Winding Special test earthing device, is characterized in that,

Comprise clamping device and termination;

Described clamping device comprises connection clamp, connection plug and is connected to connection wire between the two, and described connection clamp has the pawl formula structure coordinating for the binding post of same Secondary Winding;

Described termination comprises the shell body and the earth lead that adopt insulating material, offers multiple patch jacks for coordinating with described connection plug, and be all electrically connected on described earth lead in described each patch jack on described shell body.

2. high-voltage mutual inductor Secondary Winding Special test earthing device according to claim 1, is characterized in that, described connection clamp is three-pawl type, and the inside surface of each claw all has arc-shaped concave.

3. high-voltage mutual inductor Secondary Winding Special test earthing device according to claim 2, is characterized in that, described connection plug is Pin contact.

4. high-voltage mutual inductor Secondary Winding Special test earthing device according to claim 3, is characterized in that, on the shell body of described termination, is provided with patching panel, is provided with multiple described patch jacks on described patching panel.

5. high-voltage mutual inductor Secondary Winding Special test earthing device according to claim 4, is characterized in that, the arrangement mode of multiple described patch jacks on described patching panel is identical with the arrangement mode of the described binding post in described Secondary Winding.

6. high-voltage mutual inductor Secondary Winding Special test earthing device according to claim 5, it is characterized in that, the shell body of described termination is dumbbell shape, its two ends are respectively main electrical scheme dish and the secondary patching panel of cake shape, equal described patch jack of distribution straggly on described main electrical scheme dish and secondary patching panel.

7. high-voltage mutual inductor Secondary Winding Special test earthing device according to claim 6, is characterized in that, the center section outer peripheral face of the shell body of dumbbell shape offers groove structure, and formation can be wound around and receive the kinking groove of described connection wire.