CN104766682A - High voltage damping resistor and high voltage transmission system using the resistor - Google Patents

Abstract

The invention relates to the field of high-voltage power transmission, in particular to a high-voltage damping resistor and a high-voltage power transmission system using the resistor. The high-voltage damping resistor includes a composite outer sleeve and a resistance component. One end of the composite outer sleeve is provided with a terminal flange for connecting overhead lines, and the other end is provided with a transformer connection flange. The resistance component is electrically connected between the terminal flange and the Between the connecting flanges of the transformer, it includes an insulating rod and at least one resistance piece arranged on the insulating rod, and the resistance piece is electrically connected with the connecting terminal flange and the connecting flange of the transformer respectively. When in use, the high-voltage damping resistor can be connected in series between the isolating switch and the capacitive voltage transformer, and the high-frequency oscillating wave generated during the operation of the isolating switch can be damped and consumed by it through resistance voltage division and energy consumption characteristics. To achieve the goal of protecting the capacitive voltage transformer, it can solve the problem that the capacitive voltage transformer in the existing high-voltage transmission system is easy to be broken down.

Description

High-voltage damping resistor and high-voltage power transmission system using the resistor

technical field

The invention relates to the field of high-voltage power transmission, in particular to a high-voltage damping resistor and a high-voltage power transmission system using the resistor.

Background technique

In high-voltage transmission systems, capacitor voltage transformers play the role of measuring line voltage. However, when the isolating switch is opened and closed, it is easy to cause breakdown of the capacitive voltage transformer, and the structure of the capacitive voltage transformer itself is complex and expensive. Once a breakdown occurs, it is difficult to repair and the maintenance cost is extremely high. Obviously, the damage of the capacitor voltage transformer will directly affect the normal operation of the high-voltage transmission system and increase the operating cost of the high-voltage transmission system.

Contents of the invention

The purpose of the present invention is to provide a high-voltage damping resistor to solve the problem that capacitive voltage transformers in existing high-voltage power transmission systems are easily broken down.

Meanwhile, the object of the present invention is also to provide a high-voltage power transmission system using the above-mentioned high-voltage damping resistor.

In order to solve the above problems, the high-voltage damping resistor of the present invention adopts the following technical scheme: the high-voltage damping resistor includes a composite outer sleeve and a resistance assembly arranged in the outer sleeve, and one end of the composite outer sleeve is provided with a Connected terminal flange, the other end is provided with a transformer connecting flange for connecting with a capacitive voltage transformer, and the resistance assembly is electrically connected between the terminal flange and the transformer connecting flange, which includes insulating rods to set At least one resistance piece is installed on the insulating rod, and the resistance piece is electrically connected with the connection terminal flange and the transformer connecting flange respectively.

At least one end of the insulating rod is provided with a conductive voltage block, the conductive voltage block is fixed on the insulating rod and squeezes the resistance piece, and one of the connection terminal flange and the transformer connection flange close to the conductive voltage block is provided with a conductive voltage block. Conductive mating structure for block electrical connection.

The conductive matching structure includes a conductive socket, and a conductive contact finger that cooperates with the conductive voltage block is arranged in the conductive socket.

A radial limiter for preventing the radial deflection of the conductive voltage block is provided in the conductive socket.

The conductive voltage block is threadedly assembled on the insulating rod and a conductive gasket is arranged between the adjacent resistor sheet, and an elastic component is installed on the top between the conductive gasket and the conductive voltage block.

The connecting terminal flange, the transformer connecting flange and the composite outer sleeve together form a closed air chamber, and an air valve is arranged on one of the connecting terminal flange and the transformer connecting flange.

The high-voltage power transmission system adopts the following technical solutions: the high-voltage power transmission system includes a disconnector and a capacitive voltage transformer. A high-voltage damping resistor is set between the disconnector and the capacitive voltage transformer, and the disconnector is connected to the wiring on the upper end of the resistor through an overhead line. The terminal flange, the transformer connecting flange at the lower end of the resistor cooperates with the upper cover of the transformer, the high-voltage damping resistor includes a composite outer sleeve and a resistance component arranged in the outer sleeve, and one end of the outer sleeve is provided with an overhead line Connected terminal flange, the other end is provided with a transformer connecting flange connected with a capacitor voltage transformer, and the resistance component is electrically connected between the terminal flange and the transformer connecting flange, which includes an insulating rod to be placed on the At least one resistance piece on the insulating rod, the resistance piece is electrically connected with the connection flange of the disconnector and the connection flange of the transformer respectively.

At least one end of the insulating rod is provided with a conductive voltage block, the conductive voltage block is fixed on the insulating rod and squeezes the resistance piece, and one of the connection terminal flange and the transformer connection flange close to the conductive voltage block is provided with a conductive voltage block. Conductive mating structure for block electrical connection.

The conductive voltage block is threadedly assembled on the insulating rod and a conductive gasket is arranged between the adjacent resistor sheet, and an elastic component is installed on the top between the conductive gasket and the conductive voltage block.

The connecting terminal flange, the transformer connecting flange and the composite outer sleeve together form a closed air chamber, and an air valve is arranged on one of the connecting terminal flange and the transformer connecting flange.

Since one end of the composite outer sleeve of the high-voltage damping resistor of the present invention is provided with a connecting terminal flange for connecting with an overhead line, and the other end is provided with a transformer connecting flange for connecting with a capacitive voltage transformer, and the resistance assembly The electrical connection is between the connection terminal flange and the transformer connection flange, and the resistor sheet is electrically connected to the connection terminal flange and the transformer connection flange respectively. Therefore, when in use, one end of the isolating switch is connected to the overhead line, and the overhead line is connected to High-voltage damping resistor, high-voltage damping resistor is connected with the transformer, the high-voltage damping resistor is connected in series between the isolation switch and the capacitive voltage transformer, and it operates the isolation switch through resistance voltage division and energy consumption characteristics. The damping of the high-frequency oscillation wave generated at the time is consumed to achieve the goal of protecting the capacitor voltage transformer, thereby solving the problem that the capacitor voltage transformer is easily broken down when the isolating switch is operated in the existing high-voltage power transmission system.

Furthermore, the setting of the conductive voltage block can provide convenience for the resistance component and the corresponding flange (terminal flange, transformer connection flange); conductive gaskets and elastic parts can be used to ensure that the conductive voltage block and the resistor sheet are always connected. Close fit, when there are more than two resistors, the conductive gasket and elastic parts can also ensure the tight fit between the resistors; the gas chamber can be used to fill inert gas to protect the resistors.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of a high voltage damping resistor.

Detailed ways

The embodiment of the high-voltage damping resistor, as shown in Figure 1, the high-voltage damping resistor includes a terminal flange 1, a transformer connecting flange 3, a composite outer sleeve 2, and a resistance assembly located in the composite outer sleeve 2 .

The connection terminal flange 1 is used to connect with the overhead line, the transformer connection flange 3 is used to connect with the corresponding capacitive voltage transformer, the connection terminal flange 1 and the transformer connection flange 3 are separately arranged in the composite outer sleeve 2 Both ends are sealed and fixedly matched with the composite outer sleeve 2, so that the terminal flange 1, the composite outer sleeve 2 and the transformer connecting flange 3 together form an air chamber, which can be used for filling Inert gases such as sulfur hexafluoride can protect the resistance components. Wherein, an air valve 11 is provided on the connecting terminal flange, and the air valve 11 is used for charging and discharging inert gas.

The resistor assembly includes an insulating rod 4, a resistor sheet 5, a conductive voltage block 8, a conductive gasket 6 and elastic components. In the present embodiment, the resistors 5 are made of ceramic resistors and there are multiple resistors. The insulating rod 4 is located at the center of each resistor 5 and the resistors are connected in series. Therefore, it actually forms a center Rod, the conductive voltage block 8 is in the shape of a cap, which is assembled at one end of the insulating rod 4 through an internal thread, and integrally forms a plug connector for plugging in with the conductive matching structure provided on the terminal flange 1. In the embodiment, the conductive matching structure includes a conductive socket provided on the terminal flange 1, and a conductive contact finger 10 is arranged in the conductive socket. When the conductive voltage block 8 is inserted into the conductive socket, it can To realize the electrical connection between the two, in addition, in order to prevent the radial deflection of the conductive voltage block 8 and the conductive socket after being plugged in, the conductive socket is also provided with a radial limiter 9. In this embodiment, What the radial limiting member specifically adopts is a limiting ring. The conductive gasket 6 is set on the insulating rod, one side of which is in direct contact with the adjacent resistance sheet, and the other side guides the voltage block 8. The elastic part is specifically a butterfly reed 7, and its top is mounted on the conductive voltage block 8. At the position between the conductive gasket 6, during the assembly process, all the resistance pieces 5 on the insulating rod 4 can be squeezed by rotating the conductive voltage block 8, so as to ensure reliable contact between adjacent resistance pieces. Contact, thereby ensuring its conductivity. The other end of the insulating rod 4 is screw-fitted on the connecting flange 3 of the transformer.

In other embodiments of the high-voltage damping resistor, the insulating rod can also be located on one side of the resistor sheet, and the clamping parts such as claws are provided at both ends to realize the compression of the resistor sheet; Yes, it can be set as required.

An embodiment of a high-voltage power transmission system includes an isolating switch and a capacitive voltage transformer, and a high-voltage damping resistor is arranged between the isolating switch and the capacitive voltage transformer. The structure of the high-voltage damping resistor is shown in Figure 1. The structures of the embodiments of the damping resistors are the same and will not be repeated here.

Claims (10)

1. high pressure damped resistor, it is characterized in that, the resistor assembly comprising composite sheath cylinder and be located in outer sleeve, one end of composite sheath cylinder is provided with the binding post flange for being connected with overhead wire, the other end is provided with the instrument transformer adpting flange for being connected with capacitance type potential transformer, resistor assembly is connected electrically between binding post flange and instrument transformer adpting flange, it comprises insulating bar to be located at least one resistor disc on insulating bar, and resistor disc is electrically connected with binding post flange and instrument transformer adpting flange respectively.

2. high pressure damped resistor according to claim 1, it is characterized in that, at least one end of described insulating bar is provided with conduction briquetting, conduction briquetting to be fixed on insulating bar and pinched resistor sheet, is provided with and conducts electricity the conduction fit structure that briquetting is electrically connected in binding post flange and instrument transformer adpting flange near one of conduction briquetting.

3. high pressure damped resistor according to claim 2, is characterized in that, described conduction fit structure comprises conduction sleeve, is provided with and conducts electricity the conductive contact finger that briquetting coordinates in conduction sleeve.

4. high pressure damped resistor according to claim 3, is characterized in that, is provided with the radial locating part for preventing conduction briquetting radial beat in described conduction sleeve.

5. the high pressure damped resistor according to any one of claim 2-4, is characterized in that, conduction briquetting Screw assembly on insulating bar and and be provided with conductive spacer between adjacent resistor disc, be top-loaded with elastomeric element between conductive spacer and conduction briquetting.

6. the high pressure damped resistor according to any one of claim 1-4, it is characterized in that, described binding post flange, instrument transformer adpting flange and composite sheath cylinder surround a closed air chamber together, and one in binding post adpting flange and instrument transformer adpting flange is provided with air valve.

7. high voltage power transmisson system, comprise isolating switch and capacitance type potential transformer, it is characterized in that, high pressure damped resistor is provided with between isolating switch and capacitance type potential transformer, isolating switch is connected to the binding post of resistor upper end by overhead wire, resistor lower end and instrument transformer are got up by Flange joint, the resistor assembly that high pressure damped resistor comprises composite sheath cylinder and is located in outer sleeve, one end of outer sleeve is provided with the binding post flange be connected with overhead wire, the other end is provided with the instrument transformer adpting flange be connected with capacitance type potential transformer, resistor assembly is connected electrically between binding post flange and instrument transformer adpting flange, it comprises insulating bar to be located at least one resistor disc on insulating bar, resistor disc is electrically connected with binding post flange and instrument transformer adpting flange respectively.

8. high voltage power transmisson system according to claim 7, it is characterized in that, at least one end of described insulating bar is provided with conduction briquetting, conduction briquetting to be fixed on insulating bar and pinched resistor sheet, is provided with and conducts electricity the conduction fit structure that briquetting is electrically connected in wiring flange and instrument transformer adpting flange near one of conduction briquetting.

9. high voltage power transmisson system according to claim 8, is characterized in that, conduction briquetting Screw assembly on insulating bar and and be provided with conductive spacer between adjacent resistor disc, be top-loaded with elastomeric element between conductive spacer and conduction briquetting.

10. the high voltage power transmisson system according to any one of claim 7-9, it is characterized in that, described binding post flange, instrument transformer adpting flange and composite sheath cylinder surround a closed air chamber together, and one in binding post flange and instrument transformer adpting flange is provided with air valve.