CN112630696B - Capacitive screen coupling simulation testing device - Google Patents

Abstract

The invention relates to a capacitive screen coupling simulation test device, comprising: a conductive rod, a first capacitive screen, a second capacitive screen, a cylinder, a metal belt, a bracket, a pulse generator and a pulse detector; wherein the first capacitive screen, The second capacitive screen, the cylinder and the conductive rod are installed coaxially in turn, and are separated and fixed by insulating materials. The pulse generator and the pulse detector are respectively connected to lead out the conductive rod and the metal belt. By setting the conducting rod, the first capacitive screen, the second capacitive screen and the cylinder, the bushing conducting rod, the main capacitor, the end screen and the porcelain sleeve are simulated respectively; by setting the metal strip to simulate the coupling sensor, the metal strip and the conducting rod of different widths can be studied. The signal transfer relationship between them; setting the pulse generator and the pulse detector can simulate and analyze the transfer relationship of partial discharge and winding deformation fault signals. The invention has the advantages of simple structure, convenient installation, convenient measurement and the like, and can simulate the coupling sensor and the casing and the signal transmission relationship thereof.

Description

A capacitive screen coupling simulation test device

technical field

The invention relates to the field of electric power technology, in particular to a capacitive screen coupling simulation test device.

Background technique

Transformers and reactors are the key equipment of power grid substations. When a fault occurs inside the transformer or the pulse winding deformation test needs to be carried out on the transformer winding, the partial discharge signal or pulse signal is usually detected through the terminal screen, and the equipment status is sensed and power outage is detected. The requirements are getting higher and higher, and the online monitoring technology is more and more widely used. It is required that the equipment can be monitored safely and reliably under the condition of electricity. However, the transformation of the final screen not only requires power outage construction, resulting in power loss and increased cost, but also easily leads to problems such as moisture ingress, aging, poor contact, discharge, disconnection, and inconvenient testing, which brings risks to the safe operation of the equipment. It is a relatively new subject to obtain the information on the lead by the principle of the coupled sensor or the coupled transformer, especially the simulation study of the capacitive screen coupling.

SUMMARY OF THE INVENTION

In view of the above problems, the embodiment of the present invention provides a capacitive screen coupling simulation test device, which can simulate the coupling sensor and the casing and the signal transmission relationship thereof.

To achieve the above object, the present invention adopts the following technical solutions:

A capacitive screen coupling simulation test device, comprising a conductive rod, a first capacitive screen, a second capacitive screen, a cylinder, a metal belt, a support, a pulse generator and a pulse detector; the conductive rod is mounted on the support; The first capacitive screen and the second capacitive screen are composed of a paper tube and an aluminum foil, and the aluminum foil is wound on the paper tube; the first capacitive screen, the second capacitive screen and the cylinder are sequentially installed coaxially with the conductive rod to The insulating materials are separated and fixed; the first capacitive screen is suspended, the second capacitive screen is drawn out, the cylinder and the bracket are made of insulating materials, the pulse generator is connected to the conductive rod, and the pulse detector is connected to the The metal belt; the metal belt (5) is installed on the cylinder (4), and several metal belts (5) are arranged in sequence to form a wider metal belt, so as to replace metal belts (5) of different widths or set The metal strips (5) are in different positions.

The conductive rod adopts copper tube.

The conductive rod adopts an aluminum tube.

The beneficial effects of the present invention are:

1. The conductive rod, the first capacitive screen, the second capacitive screen and the cylinder are set to simulate the bushing conductive rod, the main capacitor, the last screen and the porcelain sleeve respectively, but the structure is simple, the installation is convenient and the measurement is convenient;

2. Set up a metal strip analog coupling sensor, which can study the signal transmission relationship between metal strips and conductive rods of different widths;

3. Set up pulse generator and pulse detector to simulate and analyze the transmission relationship of partial discharge and winding deformation fault signals.

The invention has the advantages of simple structure, convenient installation, convenient measurement and the like, and can simulate the relationship between the coupling sensor and the casing and its signal transmission, so as to provide a scientific basis for realizing non-contact measurement and improving detection sensitivity.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces 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 are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a capacitive screen coupling simulation test device in an embodiment of the present invention, wherein:

The markings shown in the figure are: 1: Conductive rod, 2: First capacitive screen, 3: Second capacitive screen, 4: Cylinder, 5: Metal strip, 6: Support, 7: Pulse generator, 8: Pulse detection instrument.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

1 shows a schematic structural diagram of a capacitive screen coupling simulation test device according to an embodiment of the present invention, including a conductive rod (1), a first capacitive screen (2), a second capacitive screen (3), a cylinder (4), and a metal strip (5), a bracket (6), a pulse generator (7) and a pulse detector (8); the conductive rod (1) is mounted on the bracket (6); the first capacitive screen (2) and The second capacitive screen (3) is composed of a paper tube and an aluminum foil, and the aluminum foil is wound on the paper tube; the first capacitive screen (2), the second capacitive screen (3), the cylinder (4) and the conductive rod ( 1) Coaxially installed in sequence, separated and fixed by insulating materials; the first capacitive screen (2) is suspended in the air, the second capacitive screen (3) is drawn out, and the cylinder (4) and the bracket (6) are insulated The pulse generator (7) is connected to the conductive rod (1), and the pulse detector (8) is connected to the metal strip (5).

The conductive rod (1) adopts a copper tube; or the conductive rod (1) adopts an aluminum tube.

The conductive rod adopts copper tube or aluminum tube, and the copper tube or aluminum tube has excellent conductivity and bending resistance.

The beneficial effects of the present invention are:

1. The conductive rod, the first capacitive screen, the second capacitive screen and the cylinder are set to simulate the bushing conductive rod, the main capacitor, the last screen and the porcelain sleeve respectively, but the structure is simple, the installation is convenient and the measurement is convenient;

2. Set up a metal strip analog coupling sensor, which can study the signal transmission relationship between metal strips and conductive rods of different widths;

3. Set up pulse generator and pulse detector to simulate and analyze the transmission relationship of partial discharge and winding deformation fault signals.

The invention has the advantages of simple structure, convenient installation, convenient measurement and the like, and can simulate the relationship between the coupling sensor and the casing and its signal transmission, so as to provide a scientific basis for realizing non-contact measurement and improving detection sensitivity.

Embodiment 2

Please refer to FIG. 1. FIG. 1 shows a schematic structural diagram of a capacitive screen coupling simulation test device in an embodiment of the present invention, including a conductive rod 1, a first capacitive screen 2, a second capacitive screen 3, a cylinder 4, a metal strip 5, The bracket 6, the pulse generator 7 and the pulse detector 8; the conductive rod 1 is installed on the bracket 6, and the conductive rod 1 adopts a copper tube or an aluminum tube; the first capacitive screen 2 and the second capacitive screen 3 are composed of a paper tube and aluminum foil, The aluminum foil is wound on the paper tube; the first capacitive screen 2, the second capacitive screen 3 and the cylinder 4 are installed coaxially with the conductive rod 1 in turn, and are separated and fixed by an insulating material. Preferably, the insulating material is a ring-shaped plastic block, and is divided into Both ends of the column; the first capacitive screen 2 is suspended in the air, the second capacitive screen 3 is drawn out, the cylinder 4 and the support 6 are made of insulating materials, preferably, the insulating material of the cylinder 4 and the support 6 is epoxy resin, and the pulse generator 7 and The pulse detector 8 is connected to the conductive rod 1 and the metal strip 5 respectively. Preferably, the model of the pulse generator 7 is XD56J, and the model of the pulse detector 8 is XD5102EY.

When in use, the second capacitive screen 3 leads to the ground, selects the width of the metal strip 5 or arranges several pieces of metal strips 5 in order to form a wider metal strip, and connects, turn on the power of the pulse detector 8, and then turn on the pulse generator 7. power supply, select the amplitude and frequency of the pulse, observe the amplitude and frequency of the pulse detector 8, and record the data; replace the metal strip 5 with different widths or set the metal strip 5 at different positions, and repeat the above steps to obtain the metal strip 5. The effect of width and position on frequency and amplitude. In addition, by changing the diameters of the first capacitive screen 2, the second capacitive screen 3 and the cylinder 4, bushings with different voltage levels can be simulated. Therefore, according to the above measurement results, the appropriate width of the metal strip 5 and its installation position can be selected according to the bushings of different voltage levels.

By setting the conducting rod, the first capacitive screen, the second capacitive screen and the cylinder, the bushing conducting rod, the main capacitor, the end screen and the porcelain sleeve are simulated respectively; by setting the metal strip to simulate the coupling sensor, it is possible to study the metal strip and the conducting rod of different widths The signal transfer relationship between them; setting the pulse generator and the pulse detector can simulate and analyze the transfer relationship of partial discharge and winding deformation fault signals. The invention has the advantages of simple structure, convenient installation, convenient measurement and the like, and can simulate the coupling sensor and the casing and the signal transmission relationship thereof.

The embodiments of the present invention have been described in detail above, and specific examples should be used in this paper to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; at the same time, For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scope. To sum up, the contents of this specification should not be construed as limiting the present invention.

Claims (3)

1. A capacitive screen coupling simulation test device, characterized in that: comprising a conductive rod (1), a first capacitive screen (2), a second capacitive screen (3), a cylinder (4), a metal strip (5), A bracket (6), a pulse generator (7) and a pulse detector (8); the conductive rod (1) is mounted on the bracket (6); the first capacitive screen (2) and the second capacitive screen (3) It is composed of a paper tube and aluminum foil, and the aluminum foil is wound on the paper tube; the first capacitive screen (2), the second capacitive screen (3) and the cylinder (4) are in the same order as the conductive rod (1). The shaft is installed and fixed by insulating materials; the first capacitive screen (2) is suspended, the second capacitive screen (3) is drawn out, the cylinder (4) and the bracket (6) are made of insulating materials, and the The pulse generator (7) is connected to the conductive rod (1), and the pulse detector (8) is connected to the metal strip (5); the metal strip (5) is installed on the cylinder (4), Several metal strips (5) are arranged in sequence to form wider metal strips, so that metal strips (5) of different widths can be replaced or the metal strips (5) can be arranged at different positions. 2 . The capacitive screen coupling simulation test device according to claim 1 , wherein the conductive rod ( 1 ) adopts a copper tube. 3 . 3 . The capacitive screen coupling simulation test device according to claim 1 , wherein the conductive rod ( 1 ) adopts an aluminum tube. 4 .

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