阅读说明：本技术 一种瓦斯继电器冗余装置 (Gas relay redundancy device ) 是由 胡敏 宋人杰 姜仕伟 王燕 孟鑫 虞晓巍 陈红勋 丁珏 于 2020-08-07 设计创作，主要内容包括：本发明公开一种瓦斯继电器冗余装置,包括两端的导流段及中间的收缩段,导流段与法兰连接,导流段中心位置设有的轮毂体上面均匀布置有一定厚度的导流片,收缩段以轴线为对称轴,对称布置有两个抛物线线段,绕轴线形成回转面。本发明将导流和收缩流技术有机结合,在本装置导流段与收缩段之间形成压差,通过该压差的变化得到油的流速变化,当流速超过阈值时,则驱动继电器报警,因而起到了瓦斯继电器的冗余作用。(The invention discloses a gas relay redundancy device which comprises flow guide sections at two ends and a middle contraction section, wherein the flow guide sections are connected with flanges, flow guide plates with certain thickness are uniformly arranged on a hub body arranged at the center of the flow guide sections, the contraction section takes an axis as a symmetry axis, two parabola sections are symmetrically arranged, and a revolution surface is formed by the axis. The invention organically combines the flow guiding and contracting technologies, forms pressure difference between the flow guiding section and the contracting section of the device, obtains the flow velocity change of oil through the change of the pressure difference, and drives the relay to alarm when the flow velocity exceeds a threshold value, thereby playing the redundant role of the gas relay.)

1. The utility model provides a redundant device of buchholz relay, includes the water conservancy diversion section at both ends and middle shrink section, water conservancy diversion section and flange joint, its characterized in that, evenly arranged the water conservancy diversion piece of certain thickness above the wheel hub body that water conservancy diversion section central point put was equipped with, shrink section uses the axis as the symmetry axis, and symmetrical arrangement has two parabola line sections, forms the surface of revolution around the axis.

2. The residual device of the gas relay as claimed in claim 1, wherein the flow guiding section and the intermediate shrinking section are designed separately, and the flow passing part of the flow guiding section is composed of the outer cylindrical surface of the flow guiding section, the hub body and the flow guiding sheets arranged in axial symmetry, which uniformly guide the flowing oil into the shrinking section.

3. The residual device for the gas relay as claimed in claim 2, wherein the number of the guide vanes is set to 4 to 6, the hub body is designed to be a streamline, the inlet and outlet sides of the guide vanes are thinned, and pressure measuring points are arranged at the outlet section of the guide vanes.

4. The residual device for the buchholz relay of claim 1, wherein the thickness of the flow deflector inflow end is less than or equal to the thickness of the outflow end.

5. The residual device for the buchholz relay according to claim 4, wherein the flow deflector inflow end and outflow end are rounded-horn-shaped.

6. The residual device for the gas relay according to claim 1, wherein the flow guide sections at the two ends are an inlet flow guide section and an outlet flow guide section, the flow guide sections are symmetrically arranged relative to the contraction section, the distance between the inlet edge of the inlet flow guide section and the inlet flange surface is represented by L1, a pressure measuring point is arranged at the outlet position of the inlet flow guide section, the distance between the pressure measuring point and the inlet flange surface is represented by L2, and the length of the flow guide section is represented by L3, wherein

7. The residual device for the gas relay according to claim 6, wherein the distance L between the pressure measuring point of the flow guide section and the flange surface of the inlet is equal to that of the pressure measuring point of the flow guide section₂Length of (d) and diameter d of the inner cylindrical surface of the flow guider₀Are equal.

8. The residual current device for the gas relay in claim 7, wherein the overflowing part of the contraction section is formed by one revolution around the axis of a parabola which is quasi-linear to the axial direction, the distance from the focus of the parabola to the quasi-linear is p, and the length of the contraction section is L₅The vertex position of the parabola of the contraction section is provided with a pressure measuring point, and the distance between the pressure measuring point and the flange surface is L₄Is represented by L₄Has a length of about d₀2 times of the total weight of the composition; the value of P is largeThe minor sum of said constriction lengths being of length L₅From d₀The criterion is that the pressure difference between the outlet of the flow guide section and the contraction section can be sensitively distinguished, and the energy loss of the oil flow is minimized to ensure that the oil flow gas relay does not influence the work of the oil flow gas relay, wherein the P value is about d₀Half of, said L₅Is substantially equal to d₀。

Technical Field

The invention relates to the technical field of power transformers, in particular to a gas relay redundancy device.

Background

In recent years, with the acceleration of industrialization and urbanization in China, the demand for electric power is strongly increased, the high-speed development of electric power industry in China is promoted, the scale and the development speed of electric power construction are unprecedented, and an electric power system is developing towards the direction of large unit, large capacity, ultrahigh voltage, long distance and intellectualization. In an electric power system, a transformer is a core device and plays a crucial role in operation, and once other accidents such as tripping occur, load loss is caused.

The Buchholz in 1921 develops the gas relay for the first time. The transformer protection device has the characteristics of simple structure, quick action, high sensitivity and the like, is stable in operation, high in reliability and simple in installation, and is used as a main protection device in the transformer. However, in recent years, power accidents caused by misoperation of the gas relay frequently occur, and great influence is caused on safe operation and power supply reliability of a power system.

Because the gas relay protection principle and the mechanical structure have inherent defects and are unique in the gas relay in the power industry, the research on the gas relay is relatively lagged. Meanwhile, manufacturers at home and abroad, electric power scientific research institutions and the like analyze the misoperation reasons of the gas relay, and provide corresponding solutions, but gas protection misoperation faults of the electric power system still occur sometimes.

Based on this, in order to master the flow characteristic of the oil flow around the gas relay, monitor and control the flow field pressure in practical application, prevent the gas relay malfunction, specially designed a gas relay's redundancy device, provide the guarantee for the safe operation of power equipment such as transformer.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a redundancy device of a gas relay.

The invention can be solved by the following technical scheme:

the invention discloses a gas relay redundancy device which comprises flow guide sections at two ends and a middle contraction section, wherein the flow guide sections are connected with flanges, flow guide plates with certain thickness are uniformly arranged on a hub body arranged at the center of each flow guide section, the contraction sections are symmetrically provided with two parabola sections by taking an axis as a symmetry axis, and a revolution surface is formed by the axis.

Furthermore, the flow guide section and the middle contraction section are designed independently in structure, the overflowing part of the flow guide section consists of an outer cylindrical surface of the flow guide section, a hub body and guide vanes which are arranged in an axial symmetry mode, and flowing oil is uniformly introduced into the contraction section.

Furthermore, the number of the guide vanes is set to be 4-6, the hub body is designed into a linear body, the inlet and outlet sides of the guide vanes are thinned, and pressure measuring points are arranged at the outlet section of the guide vanes.

Further, the thickness of the flow guide plate at the flow inlet end is smaller than or equal to that of the flow outlet end.

Further, the flow inlet end and the flow outlet end of the guide vane are in a shape of a rounded horn.

Furthermore, the flow guide sections at the two ends are an inlet flow guide section and an outlet flow guide section, the flow guide sections are symmetrically arranged relative to the contraction section, the distance between the inlet edge of the inlet flow guide section and the inlet flange surface is represented by L1, a pressure measuring point is arranged at the outlet position of the inlet flow guide section, the distance between the pressure measuring point and the inlet flange surface is represented by L2, and the length of the flow guide section is represented by L3, wherein the flow guide sections at the two ends are an inlet flow guide section and an outlet

Further, the distance L between the pressure measuring point of the flow guide section and the inlet flange surface₂Length of (d) and diameter d of the inner cylindrical surface of the flow guider₀Are equal.

Furthermore, the flow passing part of the contraction section is formed by rotating a parabola which takes the axial direction as a quasi-line for one circle around the axial line, the distance from the focus of the parabola to the quasi-line is p, and the length of the contraction section is L₅The vertex position of the parabola of the contraction section is provided with a pressure measuring point, and the distance between the pressure measuring point and the flange surface is L₄Is represented by L₄Has a length of about d₀2 times of the total weight of the composition; the size of the P value and the length of the puncture segment are L₅From d₀The criterion is that the pressure difference between the outlet of the flow guide section and the contraction section can be sensitively distinguished, and the energy loss of the oil flow is minimized to ensure that the oil flow gas relay does not influence the work of the oil flow gas relay, wherein the P value is about d₀Half of, said L₅Is substantially equal to d₀。

Advantageous effects

The invention organically combines the flow guiding and flow contracting technologies, and through flow guiding, vortex eliminating, contraction and pressure reduction, on the premise of ensuring that the normal work of the gas relay is not influenced, the pressure difference is formed at the flow guiding section of the device, the change of the flow velocity of oil is obtained through the change of the pressure difference, and when the flow velocity exceeds a threshold value, the relay is driven to alarm, so that the redundancy effect of the gas relay is achieved.

Drawings

FIG. 1 gas relay redundancy device assembly

FIG. 1-1 is a sectional view taken along the line A-A in FIG. 1

FIG. 2 part diagram of the inlet guide section

FIG. 3 is a fragmentary view of the contraction section

FIG. 4 detail view of flow deflector flow inlet end rounding

FIG. 5 three-dimensional diagram of redundant device of gas relay

FIG. 6 is a graph of pressure differential versus flow rate according to an embodiment of the present invention

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification.

As shown in fig. 1, 1-1 and 5, the redundancy device for the gas relay comprises flow deflectors at two ends and a contraction section in the middle, wherein the flow deflectors are characterized in that straight blades with certain thickness are uniformly arranged on a hub. The narrowing is characterized in that two parabolic segments c are symmetrically arranged with the axis as the symmetry axis, forming a surface of revolution about the axis.

The flow guider and the middle contraction section are separately designed in structure, and the overflowing part of the flow guider is formed by the inner cylindrical surface (diameter d) of the flow guider₀) Hub body (diameter d)_b) And the guide vanes (the thickness t of the guide vanes) are arranged in an axial symmetry manner, and the aim is to uniformly introduce flowing oil into the contraction section.

The number of the guide vanes is set to be 4-6, the thickness is determined by the required flow cross section area and the supporting strength, and the hub is designed into a streamline body, and the inlet and the outlet of the guide vanes are trimmed. And a pressure measuring point a is arranged at the outlet section of the guide vane.

The inlet guide section (shown in figure 2) and the outlet guide section are symmetrically arranged relative to the contraction section (shown in figure 3), and the distance between the inlet edge of the guide vane and the inlet flange surface is L₁L for indicating the distance between pressure measuring point of flow guide section and inlet flange surface₂Is represented by L₂Length of (d) and diameter d of the inner cylindrical surface of the flow guider₀Consistent, the length of the flow guide section is L₃And (4) showing. Wherein

The thickness of the inflow end of the inducer guide vane of the invention is less than or equal to the thickness of the outflow end, and the inflow end and the outflow end can be subjected to spatial rounding treatment if necessary, and are rounded into corners, as shown in fig. 4.

The overflowing part of the contraction section is formed by rotating a parabola which takes the axial direction as a quasi-line for a circle around the axial line, the distance from the focus of the parabola to the quasi-line is p, and the length of the contraction section is L₅. A pressure measuring point b is arranged at the vertex position of the parabola of the contraction section, and the distance between the pressure measuring point b and the flange surface is L₄Is represented by L₄Is approximately 2 times d₀. The size of the P value and the length of the puncture segment are L₅From d₀The criterion is that the pressure difference between the outlet of the flow guide section and the contraction section can be sensitively distinguished, and the energy loss of the oil flow is minimized to ensure that the oil flow gas relay is not influenced, wherein the range of P is approximately d₀About half of (L)₅Is generally equal to d₀。

The guide section can be precisely cast and precisely machined or milled by using a bar stock, the flow passing surface is required to be smooth, the guide section is connected with the inlet flange in a welding mode, and in order to prevent deformation in the welding process, proper heat treatment is considered in the welding process.

The contraction section is manufactured by adopting a milling forming method, requires a smooth flow surface and is connected with the flow guide section in a mode of positioning through threads or a spigot and then welding.

After the machining and assembly of the gas relay redundancy device are completed, a calibration test of the relation between the flow speed and the pressure is carried out, a flow speed and pressure relation curve (as shown in fig. 6, a pressure difference and flow speed relation curve of an embodiment) is determined through the test, and is compared with a theoretical calculated value, and a correlation coefficient is set.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.