CN206059058U - A kind of DC fields filter resistor and its resistor disc - Google Patents

Abstract

The utility model discloses a direct current field filter resistor and its resistor sheet, wherein the resistor sheet includes a resistor body, and the resistor body is provided with a plurality of louver holes arranged at intervals along the left and right directions, and the length of the louver holes extends along the up and down direction. The resistor strips on the resistor body except for the louver holes have a square wave shape. The resistive sheet with the structure of the utility model has improved heat dissipation performance and mechanical strength.

Description

A DC field filter resistor and its resistor sheet

technical field

The utility model relates to a direct current field filter resistor and a resistance sheet thereof.

Background technique

Since the 20th century, with the construction of UHV DC transmission projects, the number of converter stations has also increased linearly. The converter devices in the converter stations will generate harmonics during operation, and high-order harmonics will cause the voltage and current waveforms of the power grid to generate Distortion increases line loss, wastes grid capacity, and interferes with communication lines along the line, so DC transmission system filters are increasingly being applied to UHV DC transmission systems. As an important part of the DC transmission system filter, filter resistors can cooperate with electrical components such as filter reactors and filter capacitors to play the role of DC field filtering, greatly reducing the harm of harmonics to DC transmission systems.

Resistors are heating elements, and short-term operation of DC field filter resistors will generate a lot of heat, and the temperature will rise sharply. Due to the simple cutting process of ordinary chip resistors, the connection between resistor chips adopts ordinary welding methods. When the resistor is in operation, it will often be bent, deformed, bonded, or broken due to insufficient strength of the resistor chips, and what is even more likely to appear between chips. Short circuit, improper handling of the resistor sheet welding method will cause insufficient flow area of the resistor sheet, excessive local resistance, and affect the overall resistance value. In addition, when working for a short time, the resistor will bear high voltage, which is easy to cause floating potential. When the floating potential is large, partial discharge will occur, which will affect the safe operation of the equipment. In addition, the existing installation method of the DC field filter resistor cannot meet the requirements of the overall heat dissipation and the requirements of the use environment for the strength and shock resistance of the resistor.

For the above-mentioned problem of floating potential, the Chinese patent (the authorized announcement number is CN203706760U, and the authorized announcement date is 2014.07.09) discloses a filter resistor with a three-section structure, including a mounting bracket, a resistance unit, a mounting plate, and a resistance unit. The middle section is connected with the mounting plate with metal, which reduces the potential of the resistor to the shell and has no potential suspension.

Regarding the installation method of the resistor, the Chinese patent (authorized announcement number CN 203276992 U, authorized announcement date 2013.11.06) discloses a high-voltage filter resistor, which includes an upper box, a lower box, a resistance module, and an upper box. The body and the lower box body are correspondingly provided with through-wall bushings, and the upper and lower boxes are connected by connecting copper pipes pierced through the wall-through bushings. The bottom of the resistance element is provided with a first insulator, the upper and lower boxes are provided with a second insulator, and the bottom of the lower box is provided with a third insulator. The insulator is set in a way to eliminate local high temperature points, increase the heat dissipation of the equipment, and improve the safety performance of the equipment.

Contents of the invention

The purpose of the utility model is to provide a resistance sheet with good heat dissipation effect and high strength. At the same time, the utility model also provides a DC field filter resistor using the resistor sheet.

In order to achieve the above object, the technical scheme of resistor sheet in the utility model is as follows:

The resistor sheet includes a resistor body. The resistor body is provided with a plurality of louver holes arranged at intervals along the left and right directions. The length of the louver holes extends along the up and down direction. The resistance strips on the resistor body except for the louver holes are square waves.

The resistor sheet also includes reinforcing wrappings arranged on the upper and lower ends of the resistor body, and the length of the reinforcing wrapping extends along the left and right directions.

The reinforced edge is made of mica sheet and nickel-chromium alloy material.

The left and right ends of the resistor body are respectively provided with a left fold and a right fold. The left fold and the right fold are all folded in the front and rear direction relative to the resistor body and the fold directions of the left fold and the right fold are opposite. The left fold Bolt mounting holes are arranged on the side and the right folded edge.

The technical scheme of the DC field filter resistor in the utility model is as follows:

The DC field filter resistor includes a resistance unit, the resistance unit includes a plurality of resistance sheets, the resistance sheet includes a resistance body, and a plurality of louver holes arranged at intervals along the left and right directions are arranged on the resistance body, the length of the louver holes extends along the up and down direction, and the resistance The resistance bands on the body except for the louver holes have a square wave shape.

The resistor sheet also includes reinforcing wrappings arranged on the upper and lower ends of the resistor body, and the length of the reinforcing wrapping extends along the left and right directions.

The reinforced edge is made of mica sheet and nickel-chromium alloy material.

The left and right ends of the resistor body are respectively provided with a left fold and a right fold. The left fold and the right fold are all folded in the front and rear direction relative to the resistor body and the fold directions of the left fold and the right fold are opposite. The left fold Bolt installation holes are provided on the side and the right folded edge, and the adjacent resistance sheets of one resistance unit are connected by bolts.

The resistance unit includes a mounting base plate, each resistance piece of one of the resistance units is threaded together through a screw, and the end of the screw rod is connected to the installation base plate, and at least one resistance plate in the resistance unit is provided with a connection tap , the connection tap is connected to the installation base plate through a conductive connector.

Beneficial effects of the present utility model: the resistance sheet of the present utility model extends along the left and right directions to form a square wave waveform, and the resistance bands except the louver holes are in the shape of a square wave. , Improve the heat dissipation performance and mechanical strength of the resistor sheet.

Description of drawings

Fig. 1 is the front view of the utility model DC field filter resistor;

Fig. 2 is a side view of Fig. 1;

Fig. 3 is a schematic structural diagram of the resistance unit in Fig. 1;

Fig. 4 is a schematic structural view (top view) of the resistor sheet in Fig. 3;

Fig. 5 is a schematic structural view (front view) of the resistor sheet in Fig. 3 .

In the figure: 1, lower box body 2, resistance unit 3, upper box body 4, wall bushing 5, connecting copper pipe 11, square wave waveform 12, wave peak 13, wave trough 14, resistance band 15, louver hole 16, reinforcement Encapsulation 20, resistance sheet 21, screw rod 22, insulating ceramic part 23, installation base plate 24, bolt 25, right hem 26, bolt mounting hole 27, connection tap 28, left hem.

detailed description

The embodiment of the DC field filter resistor of the present utility model: as shown in Figure 1-5, it includes an upper box 3 and a lower box 1 with two layers of boxes, the lower box 1 is supported by an insulator A, and the upper and lower boxes are The lower sides of the resistance units 2 are all supported by bottom supporting insulators C. The resistance unit and the corresponding box are supported and fixed by the lateral fixed insulator D, and the resistance units in the same layer of the box are supported by the lateral mutual fastening insulator E. The upper box body 3 and the lower box body 1 are supported by an insulator B. There are six insulators A and B, which are distributed in the four corners and the middle of the corresponding box. Insulator A plays the main supporting role, and its type is better than that of insulator B. The upper and lower boxes are provided with wall-piercing sleeves 4, which are used as connection terminals, and the upper and lower boxes are connected by connecting copper pipes 5. The upper box and the lower box are fixedly stacked and installed with six positions, which reduces the floor area and improves the overall strength and shock resistance of the resistor. cooling performance.

The resistance unit includes a plurality of resistance sheets 20, and the resistance sheet 20 includes a resistance body. The resistance body is provided with a plurality of louver holes 15 arranged at intervals along the left and right directions, and the louver holes are formed by stamping. The length of the louver hole 15 extends along the up-down direction, and the resistance strips 14 on the resistor body except the louver hole are in a square wave shape. The resistance sheet is cut along the square wave waveform 11, and each resistance band 14 from the peak 12 to the valley 13 on the path is provided with louver holes. The space is greatly improved. The resistor sheet also includes reinforcing wrapping 16 arranged on the upper and lower ends of the resistor body, and the length of the reinforcing wrapping 16 extends along the left and right directions. The reinforced edges are respectively located at the horizontal positions of the crest 12 and the trough 13 of the resistor sheet. The reinforced edge 16 is made of mica sheets and nickel-chromium alloy materials. By setting the reinforced edge, the edge part of the previously weaker resistance sheet can be reinforced, avoiding the touch short circuit between the resistance strips in the vertical direction. Chip-to-chip short circuits do not occur.

In order to solve the problem of the fixed connection between the resistance pieces by welding, the left and right ends of the resistance body are respectively provided with a left fold 28 and a right fold 25, and the left fold 28 and the right fold 25 are folded in the front and rear direction relative to the resistance body And the turning direction of the left hem 28 and the right hem 25 is opposite, the left hem 28 is vertically folded backward, and the right hem 25 is vertically folded forward. Both the left flange 28 and the right flange 25 are provided with bolt mounting holes 26 . Adjacent resistor sheets of one resistor unit are connected by bolts 24, and when connected, adjacent resistor sheets are folded and overlapped and fastened by bolts. The bolt connection method of the resistor sheet not only improves the mechanical properties of the resistor sheet, but also increases the flow area of the resistor sheet, and at the same time avoids the influence of the overall resistance value of the resistor due to excessive local resistance.

The resistance unit includes a mounting base plate 23, and the resistance pieces of a resistance unit are threaded together through a screw rod 21, and the ends of the screw rods are connected to the mounting base plate. The resistance unit also includes an insulating ceramic part 22 . A connecting tap 27 is provided on a resistive sheet in the middle of the resistive unit, and the connecting tap 27 is connected to the installation base plate 23 through a conductive connector, which can be connected through a connecting sheet, or can be electrically connected through a wire. After the conductive connector is provided, the floating potential is eliminated, the impact resistance of the resistor is improved, and the BIL impact strength is reduced.

The embodiment of the resistance sheet of the present utility model: as shown in Fig. 4, 5, its structure is identical with the structure of the resistance sheet in the above-mentioned resistor embodiment, and specific embodiment is no longer described in detail.

Claims (9)

1. The resistor sheet is characterized in that it includes a resistor body, the resistor body is provided with a plurality of louver holes arranged at intervals along the left and right directions, the length of the louver holes extends along the up and down direction, and the resistance bands on the resistor body except the louver holes are in the form of Square wave shape. 2. The resistor sheet according to claim 1, characterized in that: the resistor sheet further includes reinforcing wrappings arranged on the upper and lower ends of the resistor body, the length of the reinforcing wrapping extending along the left and right directions. 3. The resistance chip according to claim 2, characterized in that: the reinforcing edge is made of mica sheet and nickel-chromium alloy material. 4. The resistor sheet according to any one of claims 1 to 3, characterized in that: the left and right ends of the resistor body are respectively provided with left and right folds, and the left and right folds are all relative to the resistor The main body is folded along the front and back directions and the folding directions of the left and right folds are opposite, and bolt mounting holes are provided on the left and right folds. 5. The DC field filter resistor is characterized in that it includes a resistance unit, the resistance unit includes a plurality of resistor sheets, the resistor sheet includes a resistor body, the resistor body is provided with a plurality of louver holes arranged at intervals along the left and right directions, and the length of the louver holes is Extending in the up and down direction, the resistance strips on the resistance body except for the louver holes are in the shape of a square wave. 6. The DC field filter resistor according to claim 5, characterized in that: the resistor sheet also includes reinforced wrappings arranged on the upper and lower ends of the resistor body, and the length of the reinforced wrappings is along the left and right directions extend. 7 . The DC field filter resistor according to claim 6 , characterized in that: the reinforcing wrapping is made of mica sheet and nickel-chromium alloy material. 8 . 8. The DC field filter resistor according to any one of claims 5 to 7, characterized in that: the left and right ends of the resistor body are respectively provided with left and right folds, and the left and right folds are both Relative to the resistance body, it is folded along the front and rear direction and the folding directions of the left and right folds are opposite, and the left and right folds are provided with bolt mounting holes, and the adjacent resistance sheets of one of the resistance units pass through bolts. connect. 9. The DC field filter resistor according to claim 8, characterized in that: the resistance unit includes a mounting base plate, and each resistance sheet of one resistance unit is threaded together by a screw, and the end of the screw is connected to the On the installation base plate, at least one resistance sheet in the resistance unit is provided with a connection tap, and the connection tap is connected to the installation base plate through a conductive connector.