CN105932547B - A kind of ground electrode circuit condenser type is released can inter space device - Google Patents

Abstract

The invention discloses a kind of ground electrode circuit condenser type to release energy inter space device, and the energy inter space device of releasing includes：Impacting electric capacity device, wire lateral electrode, shaft tower lateral electrode, metal link rod, current feed, supporting insulator, wherein, supporting insulator is arranged on shaft tower, impacting electric capacity device is fixed in supporting insulator, metal link rod one end is connected with the high-pressure side of impacting electric capacity device, the other end of metal link rod is connected with shaft tower lateral electrode, current feed one end is connected with the low-pressure end of impacting electric capacity device, the other end of current feed is connected with shaft tower tower body, wire lateral electrode is fixed on the lower section of shaft tower insulator chain conductor wire end by gold utensil, realize and cannot be easily caused failure while can effectively releasing energy, and without the technique effect of periodic maintenance.

Description

A capacitive energy release gap device for ground electrode lines

technical field

The invention relates to the field of electric equipment research, in particular to a capacitive energy release gap device for ground electrode lines.

Background technique

The patents "parallel gap dedicated to 110kV porcelain insulators (201420733499.2)", "a lightning protection device for tension series-parallel gaps (201520762095.0)", and "adjustable parallel gaps (201520834624.3)" all propose traditional Parallel gap; the parallel gap is composed of two discharge electrodes, and the discharge electrodes are respectively installed on the high-voltage end and low-voltage end of the insulator string; after the line is struck by lightning and the gap flashover is caused and the arc is established, the arc is automatically moved by making the arc move The AC current is extinguished near the zero crossing point; when this type of traditional parallel gap is applied to the DC grounding electrode line, since the arc current after the gap flashover is a DC current and has no zero crossing point, it is difficult for the arc to extinguish itself, thus forming a continuous fault.

The patent "Air Jet Parallel Gap Device (201210389771.5) proposes an active arc extinguishing parallel gap with an air jet device; this device adds an arc extinguishing powder storage room, an insulating gas generation room and an arc spray channel on the basis of the traditional parallel gap and other designs; after the flashover is caused by the lightning strike line in the parallel gap, the air injection device actively sprays high-speed arc extinguishing powder to quickly extinguish the arc in the transient state; the device needs to add and replace the arc extinguishing powder regularly, which has a great impact on later operation and maintenance. high demands.

In the unipolar operation mode or asymmetrical operation mode of the HVDC power transmission system, the grounding electrode line will pass through a DC current of up to several thousand amperes; The DC current of the pole line passes through the flashover channel, enters the ground through the pole tower, and forms a continuous DC arc at both ends of the insulator string; different from the AC arc, because the DC arc current has no zero-crossing point, it cannot be extinguished independently, and it is easy to cause continuous fault; and the continuous DC arc will burn the parallel gap electrode and the fittings at both ends of the insulator string connected in parallel with the parallel electrode, and then the fault of the grounding electrode line wire will be dropped; in recent years, many such faults have occurred in our country, resulting in Huge economic loss; therefore, the parallel gap and layout of the traditional structure are not suitable for high-voltage DC grounding electrode lines, and the active arc-extinguishing parallel gap with air injection device requires regular maintenance.

To sum up, in the process of realizing the technical solution of the invention in the embodiment of the present application, the inventor of the present application found that the above-mentioned technology has at least the following technical problems:

In the prior art, the parallel gap and layout of the existing traditional structure are not suitable for high-voltage DC grounding electrode lines, and the active arc-extinguishing parallel gap with air injection device requires regular maintenance.

Contents of the invention

The invention provides a capacitive energy-releasing gap device for grounding electrode lines, which solves the problem that the parallel gap and arrangement of the existing traditional structure are not suitable for high-voltage DC grounding electrode lines, and the active arc-extinguishing parallel gap with an air injection device The technical problem that requires regular maintenance has achieved the technical effect of being able to effectively release energy and not easily cause failures, and without regular maintenance.

In order to solve the above technical problems, the present application provides a capacitive energy release gap device for ground electrode lines on the one hand, and the energy release gap device includes:

Shock capacitor, wire side electrode, tower side electrode, metal connecting rod, current lead, support insulator, wherein, the support insulator is installed on the tower, the shock capacitor is fixed on the support insulator, and one end of the metal connecting rod is connected to the high voltage end of the shock capacitor , the other end of the metal connecting rod is connected to the electrode on the tower side, one end of the current lead is connected to the low-voltage end of the impact capacitor, the other end of the current lead is connected to the tower body, and the electrode on the wire side is fixed below the wire end of the tower insulator string through hardware.

Among them, the working principle of the capacitive energy release gap device of the ground electrode line in this application is, please refer to Figure 1, which is a circuit schematic diagram of the capacitive energy release gap device, wherein, 1a-insulator string equivalent gap; 2a-insulator Series equivalent capacitance; 3a-parallel gap; 4a-parallel gap equivalent capacitance; 5a-impact capacitor; 6a-equivalent impedance of the tower above the cross arm; Bottom equivalent impedance; 9a-ground impedance; 10a-ground electrode line wire; 11a-ground electrode line ground wire.

Among them, the gap between the electrode on the wire side and the electrode on the tower side forms a parallel gap, one end of the equivalent gap of the insulator string is connected to the equivalent impedance of the tower body above the cross arm, and then connected to the ground wire of the grounding electrode line, and the other end of the equivalent gap of the insulator string is connected to the One end of the parallel gap is connected, the other end of the parallel gap is connected to one end of the impact capacitor, the other end of the impact capacitor is connected to the equivalent impedance at the bottom of the tower, the equivalent impedance at the bottom of the tower is connected to the grounding impedance and then grounded, and the insulator strings are connected in parallel at both ends of the equivalent gap. Equivalent capacitance, the two ends of the parallel gap are connected in parallel with the equivalent capacitance of the parallel gap, one end of the equivalent impedance of the cross arm and part of the tower body is connected to the equivalent impedance of the tower above the cross arm, and the other end of the equivalent impedance of the cross arm and part of the tower body It is connected with the equivalent impedance at the bottom of the tower, and the ground electrode line conductor is connected between the equivalent gap of the insulator string and the parallel gap.

Among them, the working principle of the capacitive energy release gap device circuit is: after the ground electrode line is subjected to a large-scale lightning strike, the parallel gap of the energy release gap device flashovers before the insulator string; the impact capacitor of the energy release gap device passes through the flashover channel It forms an oscillating circuit with the grounding electrode line, tower impedance, and grounding impedance, so that the current in the flashover channel crosses zero many times to promote arc extinguishing of the flashover arc; even if the flashover arc cannot be extinguished during the oscillation period, the shock capacitor can also The DC sustaining current that interrupts the arc, thereby extinguishing the arc.

Wherein, the electrode on the wire side is specifically a circular electrode, which provides a movement path for the root of the arc, and prevents the root of the arc from ablating the same position for a long time, causing damage to the electrode.

Among them, the parallel gap size is 75% to 85% of the dry-arc distance of the insulator string, which ensures that the capacitive energy release gap device can flashover before the insulator string, and the insulation level of the ground electrode line after the capacitive energy release gap device is installed The reduction is limited.

Wherein, the tower-side electrode is specifically an arc-shaped electrode. The parallel gap electrode adopts an outward arc structure, and the arc moves outward, which is beneficial to the arc extinguishing.

Among them, the impact capacitor is a high-voltage capacitor that can be charged and discharged in a short time. After the parallel gap flashover, it forms an oscillating circuit with the ground electrode line, tower impedance, and ground impedance, so that the current in the flashover channel crosses zero many times to promote flashover. The arc is extinguished; and the DC maintaining current of the arc can be blocked, thereby extinguishing the arc.

On the other hand, the present application also provides an installation method of a capacitive energy release gap device for a ground electrode line, the installation method comprising:

Step 1: Install the supporting insulators for fixing the electrodes on the side of the tower;

Step 2: Fix the wire side electrode under the wire end of the tower insulator string through the fittings;

Step 3: Install the electrodes on the tower side and adjust the parallel gap size;

Step 4: Install the supporting insulator of the impact capacitor on the tower, and fix the impact capacitor on the supporting insulator;

Step 5: Use a metal connecting rod to connect the high-voltage end of the shock capacitor to the electrode on the tower side, and use a current lead to connect the low-voltage end of the shock capacitor to the tower body.

Wherein, the step 1 also includes designing the layout position of the electrodes on the side of the tower according to the structure of the tower head, the length of the insulator string, and the expected size of the parallel gap.

Wherein, the wire-side electrode is specifically a circular electrode.

Among them, the parallel gap size is 75% to 85% of the insulator series dry arc distance.

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

Due to the design of the capacitive energy release gap device for the grounding electrode line, it includes: impact capacitors, electrodes on the wire side, electrodes on the tower side, metal connecting rods, current leads, and supporting insulators, wherein the supporting insulators are installed on the towers, and the impact capacitors are fixed. On the supporting insulator, one end of the metal connecting rod is connected to the high-voltage end of the impact capacitor, the other end of the metal connecting rod is connected to the electrode on the side of the tower, one end of the current lead is connected to the low-voltage end of the impact capacitor, and the other end of the current lead is connected to the tower body , the technical scheme that the wire side electrode is fixed below the wire end of the tower insulator string through fittings, that is, after the grounding electrode line is subjected to a large-scale lightning strike, the parallel gap of the energy release gap device flashovers before the insulator string flashover; the impact of the energy release gap device The capacitor forms an oscillating circuit through the flashover channel, the grounding electrode line, the tower impedance, and the grounding impedance, so that the current in the flashover channel crosses zero many times, which promotes the arc extinguishing of the flashover arc; even if the flashover arc fails to extinguish during the oscillation, the shock capacitor will It can block the DC maintenance current of the arc after the oscillation process, thereby extinguishing the arc. Therefore, it effectively solves the problem that the parallel gap and arrangement of the existing traditional structure are not suitable for high-voltage DC grounding electrode lines, and the active type with air injection device The arc extinguishing parallel gap requires regular maintenance, which achieves the technical effect of effectively releasing energy while not easily causing failures and requiring no regular maintenance.

Furthermore, during the flashover period of the parallel gap, the shock capacitor, the lightning channel impedance, and the grounding electrode line impedance form an oscillating loop, which makes the current passing through the gap oscillate and cross zero multiple times, which is beneficial to the extinguishment of the flashover arc.

Further, after the arc is established, the parallel gap electrodes adopt an outward arc structure, and the arc moves outward, which is beneficial for arc extinguishing.

Furthermore, after the arc is established, the energy to maintain the arc combustion is mainly provided by the DC current flowing through the ground electrode line. Due to the DC blocking effect of the impact capacitor, the current passing through the parallel gap can be quickly reduced, thereby extinguishing the arc.

Description of drawings

The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of the application, and do not constitute a limitation to the embodiments of the present invention;

Fig. 1 is a schematic diagram of the electrical structure principle of energy release after using the present invention;

Figure 2 is a schematic diagram of the simulation results of flashover current using traditional parallel gaps;

Fig. 3 is a schematic diagram of the simulation results of the flashover current using the energy release gap device of the present invention;

Fig. 4 is a schematic diagram of the simulation results of the arc DC holding current using the traditional parallel gap;

Fig. 5 is a schematic diagram of the simulation results of arc DC maintenance current blocking using the energy release gap device of the present invention;

Figure 6 is a schematic diagram of the installation of the capacitive energy release gap device;

Fig. 7 is a schematic flow chart of the installation method of the ground electrode line capacitive energy release gap device;

Among them, 1a-the equivalent gap of the insulator string; 2a-the equivalent capacitance of the insulator string; 3a-the parallel gap; 4a-the equivalent capacitance of the parallel gap; 5a-the impact capacitor; 8a-equivalent impedance at the bottom of the tower; 9a-grounding impedance; 10a-grounding electrode line wire; 11a-grounding electrode line ground wire; 1-impact capacitor; 2-circular electrode on the wire side ; 3-arc electrode on the side of the tower; 4-metal connecting rod; 5-current lead; 6-support insulator;

detailed description

The invention provides a capacitive energy release gap device for grounding electrode lines, which solves the problem that the existing energy release gap devices have a parallel gap of traditional structure and the arrangement method is not suitable for high-voltage DC grounding electrode lines, and the active energy release gap device with air injection device The technical problem of regular maintenance is required for the parallel gap of type arc extinguishing, and the technical effect of effectively releasing energy is not easy to cause failure, and no regular maintenance is required.

In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

Embodiment one:

Please refer to Figure 1-Figure 7, this application provides a capacitive energy release gap device, which is mainly composed of a shock capacitor and a parallel gap in series (the equivalent circuit after installation is shown in Figure 1), including: a shock capacitor , Round electrodes on the wire side, arc electrodes on the tower side, metal connecting rods, and current leads. Its beneficial effect is:

During parallel gap flashover, the impact capacitor, lightning channel impedance, and grounding electrode line impedance form an oscillating loop, which makes the current passing through the gap oscillate and cross zero multiple times (the effect comparison is shown in Figure 2-Figure 3), which is beneficial to flashover arc extinguished;

After the arc is established, the parallel gap electrode adopts an outward arc structure, and the arc moves outward, which is beneficial to the arc extinguishing;

After the arc is established, the energy to maintain the arc combustion is mainly provided by the DC current flowing through the ground electrode line. Due to the DC blocking effect of the impact capacitor, the current passing through the parallel gap can be rapidly reduced (the effect comparison is shown in Figure 4-Figure 5) , thereby extinguishing the arc.

Installation method of energy release gap device:

The present invention proposes an installation method of a capacitive energy release gap device (as shown in Figures 6-7). The round electrode on the wire side is fixed directly below the wire end of the insulator string through the fitting; the arc-shaped electrode on the tower side and the impact capacitor are fixed on the tower through the supporting insulator; the bottom of the arc-shaped electrode on the tower side is connected to the high-voltage end of the impact capacitor through a metal connecting rod; The low-voltage side of the surge capacitor is connected to the tower body through the current lead. Its beneficial effect is:

The parallel gap and the insulator are arranged in "series" arrangement, the arc burning in the parallel gap will not damage the surface of the insulator, and it will not burn the connecting hardware between the insulator string and the tower to cause a series failure;

The parallel gap can be adjusted to a suitable size by adjusting the arc electrode on the side of the tower;

Using supporting insulators to fix the arc-shaped electrodes on the tower side and connecting them with metal connecting rods can ensure the insulation distance between the arc-shaped electrodes on the tower side, the high-voltage end of the impact capacitor and the tower.

First, according to the structure of the tower head, the length of the insulator string, and the estimated size of the parallel gap, design the arrangement position of the arc-shaped electrodes on the tower side, install the supporting insulators that fix the arc-shaped electrodes on the tower side; fix the round electrodes on the wire side to the insulator string wires through fittings directly below the terminal; install arc electrodes on the side of the tower, and fine-tune to ensure that the parallel gap size is 75%~85% of the dry-arc distance of the insulator string;

Install the supporting insulator of the impact capacitor on the tower, and fix the impact capacitor on the supporting insulator;

Use a metal connecting rod to connect the high voltage end of the shock capacitor and the arc electrode on the tower side;

Use current leads to connect the low-voltage end of the surge capacitor to the tower body.

The above-mentioned technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

Due to the design of the capacitive energy release gap device for the grounding electrode line, it includes: impact capacitors, electrodes on the wire side, electrodes on the tower side, metal connecting rods, current leads, and supporting insulators, wherein the supporting insulators are installed on the towers, and the impact capacitors are fixed. On the supporting insulator, one end of the metal connecting rod is connected to the high-voltage end of the impact capacitor, the other end of the metal connecting rod is connected to the electrode on the side of the tower, one end of the current lead is connected to the low-voltage end of the impact capacitor, and the other end of the current lead is connected to the tower body , the technical scheme that the wire side electrode is fixed below the wire end of the tower insulator string through fittings, that is, after the grounding electrode line is subjected to a large-scale lightning strike, the parallel gap of the energy release gap device flashovers before the insulator string flashover; the impact of the energy release gap device The capacitor forms an oscillating circuit through the flashover channel, the grounding electrode line, the tower impedance, and the grounding impedance, so that the current in the flashover channel crosses zero many times, which promotes the arc extinguishing of the flashover arc; even if the flashover arc fails to extinguish during the oscillation, the shock capacitor will It can block the DC maintenance current of the arc after the oscillation process, thereby extinguishing the arc. Therefore, it effectively solves the problem that the parallel gap and arrangement of the traditional structure of the existing energy release gap device are not suitable for high-voltage DC grounding electrode lines. The active arc extinguishing parallel gap of the air injection device requires regular maintenance technical problems, and achieves the technical effect of being able to effectively release energy while not easily causing failures, and without regular maintenance.

Furthermore, during the flashover period of the parallel gap, the shock capacitor, the lightning channel impedance, and the grounding electrode line impedance form an oscillating loop, which makes the current passing through the gap oscillate and cross zero multiple times, which is beneficial to the extinguishment of the flashover arc.

Further, after the arc is established, the parallel gap electrodes adopt an outward arc structure, and the arc moves outward, which is beneficial for arc extinguishing.

Furthermore, after the arc is established, the energy to maintain the arc combustion is mainly provided by the DC current flowing through the ground electrode line. Due to the DC blocking effect of the impact capacitor, the current passing through the parallel gap can be quickly reduced, thereby extinguishing the arc.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (1)

1. a kind of ground electrode circuit condenser type releases energy inter space device, applied in hvdc transmission line, it is characterised in that described to release Energy inter space device includes：

Impacting electric capacity device, wire lateral electrode, shaft tower lateral electrode, metal link rod, current feed, supporting insulator, wherein, support is exhausted Edge is arranged on shaft tower, and impacting electric capacity device is fixed in supporting insulator, metal link rod one end and the high pressure of impacting electric capacity device End connection, the other end of metal link rod are connected with shaft tower lateral electrode, and current feed one end is connected with the low-pressure end of impacting electric capacity device, The other end of current feed is connected with shaft tower tower body, and wire lateral electrode is fixed on ground electrode circuit shaft tower insulator chain by gold utensil The lower section of conductor wire end；It is described release can inter space device discharge loop it is in series by impacting electric capacity device and parallel connection gaps, it is described simultaneously Join gap of the gap between wire lateral electrode and shaft tower lateral electrode；The wire lateral electrode is specially circular electrode；Between parallel connection Gap size is the 75% to 85% of insulator chain dry arcing distance；The shaft tower lateral electrode is specially arc-shaped electrode.