CN110136902A - A high-voltage non-inductive resistor and its manufacturing method - Google Patents

Abstract

A high-voltage non-inductive resistor and its manufacturing method solve the problems of traditional high-power high-voltage non-inductive resistors such as complex structure, high cost, large volume, and poor short-time impact current resistance, including multiple series-parallel combinations of S Shaped resistance sheet, the resistance sheet is bent from a hollow nickel-chromium alloy tube made of Ni20Cr80, the upper and lower ends of the resistance sheet are wrapped with stainless steel connectors and the joints are argon arc welded, and the resistance sheet is set on both sides The stainless steel frame, the stainless steel connector is connected with the corresponding stainless steel frame, so that the resistance sheets are connected in series and parallel to form at least two upper and lower adjacent resistor modules, and the copper bars arranged on the stainless steel frame are passed between the resistor modules or aluminum row to realize electrical connection, and insulating support is provided between the upper and lower adjacent resistor modules and the bottom surface of the bottom resistor module. The structure is simple, the volume is small, the cost is low, and the anti-electric power performance is excellent, which can better meet the needs of users for high-power high-voltage non-inductive resistors.

Description

A high-voltage non-inductive resistor and its manufacturing method

technical field

The invention relates to a novel high-voltage non-inductive resistor and a manufacturing method thereof.

Background technique

High-voltage non-inductive resistors are the most commonly used power devices in the field of power transmission and distribution. Filter resistors for UHV DC transmission projects, filter resistors for SVC, charging resistors for SVG, starting resistors for flexible DC transmission projects, neutral point grounding resistors, etc., providing a wide range of markets for high-voltage non-inductive resistors space.

With the upgrading of the transmission and distribution network, the power of high-voltage non-inductive resistors continues to increase. Traditional high-power non-inductive resistors are divided into cast iron resistors, grid resistors, strip resistors, mesh resistors, etc. The resistance value of cast iron resistors is extremely difficult to control during the production process, the resistivity is low, and the weight is heavy; grid resistors form resistance elements through the processing of resistance alloy plates, there is a large waste of raw materials during processing, and the cost is high , The processing of resistance elements is complicated; strip type and mesh resistors have problems such as weak resistance to short-term current impact, low temperature resistance, and large product volume.

Contents of the invention

The purpose of the present invention is to solve the technical problems of traditional high-power high-voltage non-inductive resistors such as complex structure, high cost, large volume, and poor short-time impact current resistance, and to provide a new high-voltage non-inductive resistor and its manufacturing method , simple in structure, small in size, low in cost, and excellent in anti-electric power performance, and can better meet the needs of users for high-power high-voltage non-inductive resistors.

The present invention is achieved like this:

A high-voltage non-inductive resistor, including a plurality of S-shaped resistors combined in series and parallel. The upper and lower ends of the side are wrapped with stainless steel connectors and the joints are welded by argon arc welding. Stainless steel frames are arranged on both sides of the resistance sheet. The upper and lower adjacent resistor modules are electrically connected through copper or aluminum bars set on the stainless steel frame, and insulating supports are set between the upper and lower adjacent resistor modules and the bottom surface of the bottom resistor module .

Further preferably, the spacing between the resistor sheets is ≥ 20mm, and the S-shaped corrugation pitch of the resistor sheet is ≥ 30mm, so as to meet the requirements of air insulation, natural air cooling and internal insulation of the resistor sheet.

Further preferably, a connecting plate frame is fixedly arranged on the stainless steel frame, and the connecting plate frame is connected to the stainless steel connecting piece.

Further preferably, mounting holes corresponding to each other are provided on the connecting plate frame and the stainless steel connecting piece, and are connected by bolts and nuts.

Further preferably, the insulating support is arranged on an adjacent stainless steel frame.

A method for manufacturing a high-voltage non-inductive resistor, the steps of which are as follows:

1. The hollow nickel-chromium alloy tube made of Ni20Cr80 is used, and the "S" shape resistor is bent according to the micro-induction requirements;

2. The resistance piece after bending and forming is solid solution treated at 980°C~1150°C. After heat preservation for 10min-20min, it is water-cooled to dissolve the carbides in the nickel-chromium alloy and obtain single-phase austenite, and then heat at 900°C. -950℃, after 2.5h-3.5h aging treatment;

3. After heat treatment, the upper and lower ends of both sides of the resistance sheet are argon arc welded with the stainless steel connectors wrapped on both sides, and the stainless steel connectors are connected with the stainless steel frames set on both sides of the resistance sheet. The value makes the resistors combined in series and parallel to form at least two upper and lower adjacent resistor modules, and the two adjacent resistor modules are electrically connected through copper or aluminum bars. Between the upper and lower adjacent resistor modules And an insulating support is provided on the bottom surface of the bottom resistor module, and the insulating support is connected with the adjacent stainless steel frame.

Further preferably, the spacing between the resistor sheets is ≥ 20mm, and the S-shaped corrugation pitch of the resistor sheet is ≥ 30mm, so as to meet the requirements of air insulation between the resistor sheets, natural air cooling and internal insulation of the resistor sheets.

Further preferably, a connecting plate frame is fixedly arranged on the stainless steel frame, and the connecting plate frame is connected to the stainless steel connecting piece.

More preferably, the resistivity of the hollow nickel-chromium alloy tube is 1.10×10 ^-6 Ω·m to 1.14×10 ^-6 Ω·m, so as to improve the mechanical strength of the hollow structural tube body.

The beneficial effects of the present invention are:

1. The resistor adopts modular design. According to the design requirements, the resistors are combined in series and parallel to make resistor modules with different power and different resistance values.

2. The resistance sheet in the resistor is bent in an "S" shape, and the adjacent resistance wires have opposite current directions and the magnetic fields cancel each other out, and the residual inductance can be as small as uH in any resistance value segment of the resistor.

3. The resistor uses high-quality hollow nickel-chromium alloy tube as the resistance wire, which not only has high mechanical strength, excellent corrosion resistance and oxidation resistance, but also enhances the current skin effect. The resistance sheet after bending and forming adopts the heat treatment process of solid solution treatment, heat preservation and water cooling to basically dissolve the carbides in the nickel-chromium alloy and obtain single-phase austenite, and then perform aging treatment to make the alloy carbides in the grain boundary Both have precipitation, the coefficient of linear expansion decreases, the grain boundary structure of the superalloy is improved, the weak link of the grain boundary at high temperature is eliminated, the mechanical strength and thermal deformation resistance of the resistance wire after forming are enhanced, and the resistance to short-term large The current impact capability ensures that the resistor will not deform when it operates at a high temperature of 500°C, so that the new structure of the resistor sheet can be used as long as both ends are fixed and no support is needed in the middle.

4. The upper and lower ends of the resistance sheet are made of stainless steel connectors. The stainless steel connectors are wrapped on both ends of the resistance alloy tube and welded by argon arc, which improves the mechanical strength of the terminal, reduces the contact resistance, and increases the short-term impact resistance of the resistor. ability.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation that the hollow nickel-chromium alloy tube of the present invention is bent and made into resistance sheet;

Fig. 3 is a schematic diagram of the connection structure between the stainless steel connector and the resistance sheet of the present invention;

Fig. 4 is the enlarged schematic view of the connecting part of the stainless steel connector of the present invention and the resistor sheet;

Fig. 5 is an enlarged view of part A of Fig. 1 .

In the figure: 1. Resistor sheet, 101. Hollow nickel-chromium alloy tube, 2. Stainless steel connector, 3. Stainless steel frame, 4. Insulation support, 5. Copper or aluminum row, 6. Mounting hole, 7. Connecting plate frame , 8. Bolts.

Detailed ways

The present invention is described in detail below in conjunction with accompanying drawing and embodiment:

Example 1

As shown in the figure, the high-voltage non-inductive resistor includes a plurality of "S"-shaped resistors 1, and the resistors 1 are made of a hollow nickel-chromium alloy tube made of Ni20Cr80 and a resistivity of 1.10×10 ^-6 Ω·m 101 bent, the outer diameter of the hollow nickel-chromium alloy tube 101 is 3.0mm, and the inner diameter is 1.5mm. The upper and lower ends of the two sides of the resistor sheet 1 are wrapped with stainless steel connectors 2 and the joints are welded by argon arc welding. 1 Stainless steel frames 3 are arranged on both sides, and the connecting plate frame 7 is fixedly installed on the stainless steel frame 3. The stainless steel connecting piece 2 and the connecting plate frame 7 are provided with corresponding installation holes 6 at the corresponding positions. The stainless steel connecting piece 2 and the corresponding connecting plate frame 7. By connecting the bolts 8 and nuts installed in the installation holes 6, the resistance sheets 1 are combined in series and in parallel to form at least two upper and lower adjacent resistor modules according to different power and different resistance values. This embodiment is two Up and down adjacent resistor modules, the electrical connection between the two adjacent resistor modules is realized through the copper or aluminum row 5 arranged on the stainless steel frame 3, between the two upper and lower adjacent resistor modules and the bottom layer The bottom surface of the resistor module is provided with an insulating support 4 made of high temperature resistant insulating material, and the insulating support 4 is connected to the adjacent stainless steel frame 3 by screws.

The spacing between the resistor sheets 1 is ≥ 20 mm, and the S-shaped corrugation pitch of the resistor sheet 1 is ≥ 30 mm, so as to meet air insulation and natural air cooling and heat dissipation, and meet the requirements for internal insulation strength of the resistor sheet.

The manufacturing method of the above-mentioned high-voltage non-inductive resistor is shown in the figure, and the steps are as follows:

1. Bend the hollow nickel-chromium alloy tube 101 into an "S"-shaped resistor 1 according to the micro-induction requirements;

2. The resistance piece 1 after bending and forming is solid solution treated at 980°C as a whole, and after 20 minutes of heat preservation, it is water-cooled to dissolve the carbides in the nickel-chromium alloy to obtain single-phase austenite, and then at 900°C for 3 hours respectively Aging treatment; through solution treatment and aging treatment, the expansion coefficient of the material is reduced, thereby reducing the deformation of the resistor sheet.

3. After heat treatment, the upper and lower ends of both sides of the resistance sheet 1 are argon-arc welded with the stainless steel connectors 2 wrapped on both sides, and a stainless steel frame 3 is set on both sides of the resistance sheet 1, and the stainless steel frame 3 is welded and connected The plate frame 7, the stainless steel connector 2 and the connecting plate frame 7 are provided with mounting holes 6 corresponding to each other, and the corresponding stainless steel connector 2 and the stainless steel frame 3 are connected by bolts 8 and nuts installed in the mounting hole 6. According to different Power and different resistance values make the resistance sheet 1 form at least two upper and lower adjacent resistor modules through series and parallel combination. In this embodiment, two upper and lower adjacent resistor modules are formed, and the adjacent two resistor modules are passed through The copper bar or aluminum bar 5 realizes the electrical connection, and the insulating support 4 made of high-temperature-resistant insulating material is set between the upper and lower adjacent resistor modules and the bottom surface of the bottom resistor module, and the insulating support 4 is connected to the corresponding stainless steel frame by screws. 5 connections.

The spacing between the resistor sheets is 20mm, the resistor sheet width H=120mm, the resistor sheet length L=360mm, the corrugation pitch*number of times=30mm*12, so as to meet the requirements of air insulation, natural air cooling and internal insulation strength of the resistor.

Example 2

In this high-voltage non-inductive resistor, the "S"-shaped resistor sheet 1 is bent from a hollow nickel-chromium alloy tube 101 made of Ni20Cr80 with a resistivity of 1.14× ^10-6 Ω·m, and the others are as described in Example 1. The structure is the same.

The manufacturing method of the above-mentioned high-voltage non-inductive resistor is shown in the figure, and the steps are as follows:

1. Bend the hollow nickel-chromium alloy tube 101 to make an "S"-shaped resistor 1 according to the micro-induction requirements;

2. The resistance sheet 1 after bending and forming is solid-solution treated at 1150°C as a whole, and after 10 minutes of heat preservation, it is water-cooled to dissolve the carbides in the nickel-chromium alloy and obtain single-phase austenite, and then at 950°C for 3 hours. aging treatment;

3. After heat treatment, the upper and lower ends of both sides of the resistance sheet 1 are argon-arc welded with the stainless steel connectors 2 wrapped on both sides, and a stainless steel frame 3 is set on both sides of the resistance sheet 1, and the stainless steel frame 3 is welded and connected The plate frame 7, the stainless steel connector 2 and the connecting plate frame 7 are provided with mounting holes 6 corresponding to each other, and the corresponding stainless steel connector 2 and the stainless steel frame 3 are connected by bolts 8 and nuts installed in the mounting hole 6. According to different Power and different resistance values make the resistance sheet 1 form at least two upper and lower adjacent resistor modules through series and parallel combination. This embodiment is two upper and lower adjacent resistor modules, and the two adjacent resistor modules pass through Copper row or aluminum row 5 realizes electric connection, and the insulating support 4 that material is high-temperature-resistant insulating material is set between the upper and lower adjacent resistor modules and the bottom surface of the bottom resistor module, and the insulating support 4 is connected with the adjacent stainless steel through screws. Frame 3 connections.

The spacing between the resistor sheets is 25mm, the resistor sheet width H=120mm, the resistor sheet length L=420mm, the corrugation pitch*number of times=35mm*12, so as to meet the requirements of air insulation, natural air cooling and internal insulation strength of the resistor sheet.

Example 3

In this high-voltage non-inductive resistor, the "S"-shaped resistor sheet 1 is bent from a hollow nickel-chromium alloy tube 101 made of Ni20Cr80 with a resistivity of 1.12× ^10-6 Ω·m, and the others are as described in Example 1. The structure is the same.

The manufacturing method of the above-mentioned high-voltage non-inductive resistor is shown in the figure, and the steps are as follows:

1. Bend the hollow nickel-chromium alloy tube 101 into an "S"-shaped resistor 1 according to the micro-induction requirements;

2. The resistance sheet 1 after bending and forming is solid-solution treated at 1060°C as a whole, and after 15 minutes of heat preservation, it is water-cooled to dissolve the carbides in the nickel-chromium alloy and obtain single-phase austenite, and then at 920°C for 3 hours. aging treatment;

3. After heat treatment, the upper and lower ends of both sides of the resistance sheet 1 are argon-arc welded with the stainless steel connectors 2 wrapped on both sides, and a stainless steel frame 3 is set on both sides of the resistance sheet 1, and the stainless steel frame 3 is welded and connected The plate frame 7, the stainless steel connector 2 and the connecting plate frame 7 are provided with mounting holes 6 corresponding to each other, and the corresponding stainless steel connector 2 and the stainless steel frame 3 are connected by bolts 8 and nuts installed in the mounting hole 6. According to different Power and different resistance values make the resistance sheet 1 form at least two upper and lower adjacent resistor modules through series and parallel combination. In this embodiment, two upper and lower adjacent resistor modules are formed, and the adjacent two resistor modules are passed through The copper bar or aluminum bar 5 realizes electrical connection, and an insulating support 4 made of a high-temperature-resistant insulating material is provided between the upper and lower adjacent resistor modules and the bottom surface of the bottom resistor module, and the insulating support 4 passes through the corresponding stainless steel frame 3 screw connection.

The spacing between the resistors is 30mm, the width of the resistors is H=120mm, the length of the resistors is L=480mm, the corrugation pitch*number of times=40mm*12, so as to meet the requirements of air insulation, natural air cooling and heat dissipation, and the internal insulation strength of the resistors .

The hardness values, resistivity and coefficient of linear expansion of the resistance sheets corresponding to the above three embodiments are shown in Table 1, Table 2 and Table 3 respectively:

Table 1 Hardness value of resistor sheet (HV0.2)

original state Solution treatment Aging treatment Example 1 205 203 229 Example 2 205 206 235 Example 3 205 204 230

Table 2 Resistivity of resistor sheet (μΩ*m)

Table 3 Heating wire linear expansion coefficient under different aging temperatures

original sample Solution treatment Aging treatment Example 1 (400°C) 14.79 12.20 10.86 Example 2 (500°C) 15.94 13.12 11.51 Example 3 (600°C) 16.65 13.98 12.41

When the above-mentioned resistor modules are four, two of them are adjacent up and down, and the other two are arranged in parallel, and the left and right adjacent resistor modules meet the insulation requirements between the two parallel resistor modules by ensuring the insulation distance.

The above are only specific embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A high-voltage non-inductive resistor, comprising a plurality of S-shaped resistor sheets combined in series and parallel, characterized in that: the resistor sheet is bent from a hollow nickel-chromium alloy tube made of Ni20Cr80, and the resistor sheet has two The upper and lower ends of the side are wrapped with stainless steel connectors and the joints are welded by argon arc welding. Stainless steel frames are arranged on both sides of the resistance sheet. The upper and lower adjacent resistor modules are electrically connected through copper or aluminum bars set on the stainless steel frame, and insulating supports are set between the upper and lower adjacent resistor modules and the bottom surface of the bottom resistor module . 2. The high-voltage non-inductive resistor according to claim 1, characterized in that: the spacing between the resistor sheets is ≥ 20mm, and the S-shaped corrugation pitch of the resistor sheet is ≥ 30mm. 3. The high-voltage non-inductive resistor according to claim 1, characterized in that: a connecting plate frame is fixedly arranged on the stainless steel frame, and the connecting plate frame is connected to the stainless steel connecting piece. 4. The high-voltage non-inductive resistor according to claim 3, characterized in that: the connecting plate frame and the stainless steel connector are provided with mounting holes corresponding to each other, and are connected by bolts and nuts. 5. The high-voltage non-inductive resistor according to claim 1, characterized in that: the insulating support is arranged on the adjacent stainless steel frame. 6. A manufacturing method of a high-voltage non-inductive resistor, characterized in that: the steps are as follows: 1), using a hollow nickel-chromium alloy tube made of Ni20Cr80, bending an "S"-shaped resistor according to the requirements of micro-inductance; a manufacturing method of a high-voltage non-inductive resistor, the steps are as follows: 2) The resistance piece after bending and forming is solid solution treated at 980 ℃ ~ 1150 ℃. After 10min-20min of heat preservation, it is water-cooled to basically dissolve the carbides in the nickel-chromium alloy and obtain single-phase austenite. 900°C-950°C, after 2.5h-3.5h aging treatment; 3) After heat treatment, the upper and lower ends of both sides of the resistance sheet are argon-arc welded with the stainless steel connectors wrapped on both sides, and the stainless steel connectors are connected with the stainless steel frames set on both sides of the resistance sheet. The resistance value makes the resistance sheets combined in series and parallel to form at least two upper and lower adjacent resistor modules, and the two adjacent resistor modules are electrically connected through copper or aluminum bars. Insulation support is provided between the space and the bottom surface of the bottom resistor module. 7. The method for manufacturing a high-voltage non-inductive resistor according to claim 6, characterized in that: the spacing between the resistor sheets is ≥ 20mm, and the S-shaped corrugation pitch of the resistor sheet is ≥ 30mm. 8. The high-voltage non-inductive resistor according to claim 6, characterized in that: a connecting plate frame is fixedly arranged on the stainless steel frame, and the connecting plate frame is connected to the stainless steel connecting piece. 9. The high-voltage non-inductive resistor according to claim 6, characterized in that: the resistivity of the hollow nickel-chromium alloy tube is 1.10×10 ^-6 Ω·m˜1.14×10 ^-6 Ω·m. 10. The high-voltage non-inductive resistor according to claim 6, characterized in that: the insulating support is arranged on the adjacent stainless steel frame.