CN205376222U - Two -stage series gap thunderbolt flashover protector of 10kV tape insulation - Google Patents

Abstract

The utility model discloses a two -stage series gap thunderbolt flashover protector of 10kV tape insulation, it includes the drainage stick, insulator and zinc oxide arrester, the high -pressure side in zinc oxide arrester (2) is fixed to the low -pressure end of insulator (1), stiff end (3.1) of the side fixed connection drainage stick (3) of the high -pressure side of insulator (1), discharge end (3.2) of drainage stick (3) are corresponding with the low -pressure end of insulator (1), form first order discharge gap, be provided with the second level discharge gap who prevents the lightning overvoltage and cut power frequency continuous current on zinc oxide arrester (2). The utility model discloses a sub - bearing structure of tape insulation has fixed main discharge gap distance, and messenger's main gap does not receive various natural condition's influence, can guarantee that thunderbolt flashover protector can effectively move, can adapt to various 10kV line Tower's installation through this kind of structure.

Description

A 10kV two-stage series gap lightning flashover protector with insulator

technical field

The utility model relates to lightning protection equipment, in particular to a 10kV line lightning protection protector, in particular to a 10kV two-stage series gap lightning flashover protector with insulators.

Background technique

The insulation level of the 10kV distribution line is relatively prone to lightning flashover, and then a power frequency arc is formed to burn the wire. Overhead distribution lines use insulated wires, which solve the corridor and safety problems that bare wires cannot. Secondary insulated conductor lightning strike disconnection accidents, and even 35kV bare conductors have also experienced lightning strike disconnection accidents. Burn the wire in a short time, even if it is a bare wire, if the current passing through it is large, it can burn the wire.

Composite insulating cross arms, piercing arc-proof fittings, lightning protection pillar insulators and zinc oxide arresters are currently used, but according to feedback from field practice, there are various problems, and it is difficult to form effective measures. For example, the production and installation costs of composite insulating cross-arms are high, and the on-site installation is complicated; piercing arc-proof fittings will affect the reliability of power supply and power quality, and the tripping rate of lightning strikes is relatively high. After puncturing the insulation layer, water may enter the core of the insulated wire , lead to electrochemical corrosion and disconnection at the sag of the wire; the mechanical strength of the insulator of the lightning protection post insulator is low, much lower than that of the pin insulator, and the stress concentration is high; the protection range of the zinc oxide arrester is small, and the installation of the entire line may cause Water ingress into the core of the insulated wire leads to electrochemical corrosion and disconnection at the sag. Long-term exposure to power frequency voltage may cause aging of the zinc oxide valve plate, which must be operated and maintained. Moreover, the zinc oxide arresters currently used are mainly single air gaps, which cannot be adapted to the installation of tension towers and wire jumper tower structures. Moreover, due to the use of pure air gaps, there is a phenomenon of wind swing of high-voltage wires, which seriously affects the air gap. There is a certain risk in the safe operation of the line, and because there is only one discharge gap, the arc discharge is unstable, making it difficult for the lightning protection device to form effective line protection, and it is difficult for the lightning protection device to form effective line lightning protection.

Utility model content

The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing lightning protection measures, and provide a 10kV two-stage series gap lightning flashover protector with insulators, which can effectively prevent the wind swing of the line from affecting the air gap phenomenon, and control The path of the discharge arc reduces the lightning tripping rate of the line and improves the reliability of power supply.

In order to achieve the above purpose, a 10kV two-stage series gap lightning flashover protector with an insulator provided by the utility model includes an insulator, a drain rod and a zinc oxide arrester, and is characterized in that: the low-voltage end of the insulator is fixed on the oxide The high-voltage end of the zinc arrester, the side of the high-voltage end of the insulator is fixedly connected to the fixed end of the drain rod, and the discharge end of the drain rod corresponds to the low-voltage end of the insulator to form a first-stage discharge gap; the oxidation There is a second-level discharge gap on the zinc arrester.

Further, the first-level discharge gap is the main discharge gap, and the second-level discharge gap is an auxiliary discharge gap that can prevent lightning overvoltage and cut off power frequency freewheeling.

Further, the high-voltage end of the insulator is provided with a first connecting screw, a first fixing nut and a fixing hole, the low-voltage end of the insulator is cylindrical, and the upper part of the cylindrical low-voltage end is provided with a fixing screw hole, and the oxidation The high-voltage end of the zinc arrester is provided with a second connecting screw, and the second connecting screw is fixedly connected with the fixing screw hole; the lower part of the cylindrical low-voltage end is provided with a fixing nut escutcheon, and the high-voltage end of the zinc oxide arrester A second fixing nut is provided, and the second fixing nut is fixedly connected with the fixing nut escutcheon.

Preferably, the first-stage gap is an air gap of 38-42 mm.

Preferably, the first-stage gap is an air gap of 40 mm.

Further, a zinc oxide valve plate is provided in the middle of the zinc oxide arrester, two discharge balls are connected to the zinc oxide valve plate, and a second-stage discharge gap of 6-10 mm is formed between the discharge balls.

Preferably, a second-level discharge gap of 7 mm is formed between the discharge balls.

Further, the low-voltage end of the zinc oxide arrester is provided with a third connecting screw.

Further, the zinc oxide arrester is used to prevent lightning according to the two standards of DL/T815-2002 "Composite Metal Oxide Arrester for AC Transmission Lines" and GB11032-2000 "Gapless Metal Oxide Arrester for AC" Zinc oxide surge arrester with external series gap for overvoltage and cut off power frequency freewheeling.

In the utility model, the series gap of the zinc oxide arrester and the air gap between the insulator and the drainage rod prevent the lightning flashover protector from being affected by power frequency voltage and operating overvoltage at ordinary times, thereby prolonging the lightning strike flashover protector service life. Through the design of the insulator, the main discharge gap is stabilized, and the main discharge gap is prevented from being affected by various natural conditions, so that the zinc oxide flashover protector is suitable for the installation of various 10kV line towers, and the arc flashover path is effectively controlled. The auxiliary discharge gap is a series gap, under the action of lightning overvoltage, it ensures the stability of the discharge in the series gap, makes the lightning flashover protector operate effectively, limits the amplitude of lightning overvoltage and cuts off the continuous current of power frequency, and prevents the occurrence of insulator flashover ACCIDENT. Moreover, since the zinc oxide arrester has an external series gap, it can effectively absorb a part of the lightning current. In addition to ensuring the effective operation of the lightning flashover protector, the arc extinguishing ability of the lightning flashover protector is stronger.

Therefore, when the 10kV overhead distribution line is struck by lightning, the lightning flashover protector can break through the discharge gap provided by the insulator and the discharge gap in the zinc oxide arrester, so that the lightning flashover protector operates, and the lightning overvoltage is limited to the insulator Under the flashover voltage, the power frequency freewheeling current is cut off by the lightning flashover protector, which can prevent line faults caused by lightning flashover.

The beneficial effects of the utility model are:

1. The two-stage series pure air gap structure is adopted to ensure that the lightning flashover protector can operate effectively, and the arc extinguishing ability is stronger than that of the gapless zinc oxide arrester;

2. Adopt two-stage series gap structure, so that no current flows through the zinc oxide valve plate in the absence of lightning current, and it does not bear the system voltage, thereby prolonging the service life of the lightning flashover protector, reducing daily operation and maintenance, and saving Substantial human and financial resources;

3. The stable main discharge gap is adopted to prevent the main gap from being affected by various natural conditions, so that the zinc oxide flashover protector is suitable for the installation of various 10kV line towers, and effectively controls the arc flashover path;

4. It is suitable for 10kV overhead distribution lines, including insulated lines and bare wire lines, to prevent insulated wires from being struck by lightning and disconnected.

Description of drawings

Fig. 1 is a structural schematic diagram of a lightning flashover protector of the present invention.

Fig. 2 is a schematic structural diagram of the insulator in Fig. 1 .

FIG. 3 is a schematic structural diagram of the zinc oxide arrester in FIG. 1 .

Fig. 4 is a schematic structural diagram of the drainage rod in Fig. 1 .

Among them: 1—insulator;

1.1—first connecting screw; 1.2—first fixing nut; 1.3—fixing hole; 1.4—fixing screw hole; 1.5—fixing nut escutcheon.

2—zinc oxide arrester;

2.1—the second connecting screw; 2.2—the second fixing nut, 2.3—compression nut, 2.4—composite jacket, 2.5—zinc oxide valve piece, 2.6—the third connecting screw, 2.7—discharge ball.

3—drainage stick;

3.1—fixed end; 3.2—discharge end.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are explanations of the utility model and the utility model is not limited to the following embodiments.

The utility model provides a 10kV two-stage series gap lightning flashover protector with an insulator, comprising an insulator (1), a zinc oxide lightning arrester (2) and a drain rod (3), and the low-voltage end of the insulator (1) is fixed At the high-voltage end of the zinc oxide arrester (2), the side of the high-voltage end of the insulator (1) is fixedly connected to the fixed end (3.1) of the drain rod (3), and the discharge end of the drain rod (3) ( 3.2) Corresponding to the low-voltage end of the insulator (1), a first-stage discharge gap of 40 mm is formed; the zinc oxide arrester (2) is provided with an auxiliary discharge gap that can prevent lightning overvoltage and cut off power frequency freewheeling The second level discharge gap.

The high-voltage end of the insulator (1) is provided with a first connecting screw (1.1), a first fixing nut (1.2) and a fixing hole (1.3), the low-voltage end of the insulator (1) is cylindrical, and the cylindrical The upper part of the low-voltage end is provided with a fixed screw hole (1.4), and the high-voltage end of the zinc oxide arrester (2) is provided with a second connecting screw (2.1), and the second connecting screw (2.1) is connected to the fixed screw hole ( 1.4) fixed connection; the bottom of the cylindrical low-pressure end is provided with a fixed nut escutcheon (1.5), and the high-voltage end of the zinc oxide arrester (2) is provided with a second fixed nut (2.2), and the second fixed nut ( 2.2) It is fixedly connected with the fixing nut escutcheon (1.5), and the low voltage end of the zinc oxide arrester (2) is provided with a third connecting screw (2.6).

The middle part of the zinc oxide arrester (2) is provided with a zinc oxide valve plate (2.5), and two discharge balls (2.7) are connected to the zinc oxide valve plate (2.5), and a discharge ball (2.7) is formed between them. 7mm second level discharge gap.

The zinc oxide arrester (2) is used to prevent lightning according to the two standards of DL/T815-2002 "Composite Metal Oxide Arrester for AC Transmission Lines" and GB11032-2000 "Gapless Metal Oxide Arrester for AC" Zinc oxide surge arrester with external series gap for overvoltage and cut off power frequency freewheeling.

The working principle of the utility model is:

The low-voltage end of the insulator (1) is fixed on the high-voltage end of the zinc oxide arrester (2), the side of the high-voltage end of the insulator (1) is fixed with the drain rod (3), and the zinc oxide arrester ( 2) The third connecting screw (2.6) provided at the low-voltage end is fixed on the steel foot of the line insulator through the installation of fittings, and the zinc oxide arrester (2) is connected in parallel to the insulator (1) side. When the power grid is in normal operation, since the main discharge gap is formed between the insulator (1) and the diversion rod (3), and the zinc oxide arrester (2) itself is designed with an auxiliary discharge gap, it forms two gaps with the air gap at the high voltage end of the zinc oxide arrester. The gap in series can isolate the power frequency voltage, so that the zinc oxide arrester (2) hardly bears the voltage. Two series gaps are designed at the same time, so that the zinc oxide arrester (2) does not operate under the operating overvoltage, prolonging the service life of the zinc oxide arrester (2); under the action of lightning overvoltage, the two air gaps are simultaneously broken down and oxidized The zinc arrester (2) presents a low impedance, which discharges the lightning current into the ground; after the lightning strikes, the power frequency voltage is loaded on the zinc oxide arrester (2), and the resistance of the zinc oxide arrester (2) increases instantly, and the passing current is the arc The current is suppressed at a lower value, the arc voltage drop of the air gap increases, the insulation of the air gap recovers quickly, the arc is naturally extinguished in a very short time, and the power frequency freewheeling is completely blocked.

Claims (8)

1. A 10kV two-stage series gap lightning strike protector with an insulator, comprising an insulator (1), a zinc oxide arrester (2) and a drain rod (3), is characterized in that: the low-voltage end of the insulator (1) is fixed on The high-voltage end of the zinc oxide arrester (2), the side of the high-voltage end of the insulator (1) is fixedly connected to the fixed end (3.1) of the drain rod (3), and the discharge end (3.2) of the drain rod (3) is connected to the insulator ( The low-voltage end of 1) corresponds to the first-stage discharge gap; the zinc oxide arrester (2) is provided with a second-stage discharge gap. 2. The 10kV two-stage series gap lightning flashover protector with insulators according to claim 1, characterized in that: the high voltage end of the insulator (1) is provided with a first connecting screw (1.1), a first fixing nut (1.2 ) and fixing holes (1.3), the low-voltage end of the insulator (1) is cylindrical, the upper part of the cylindrical low-voltage end is provided with a fixing screw hole (1.4), and the high-voltage end of the zinc oxide arrester (2) is provided with The second connecting screw (2.1), the second connecting screw (2.1) is fixedly connected to the fixing screw hole (1.4); the lower part of the cylindrical low pressure end is provided with a fixing nut escutcheon (1.5), and the zinc oxide The high voltage end of the lightning arrester (2) is provided with a second fixing nut (2.2), and the second fixing nut (2.2) is fixedly connected with the fixing nut escutcheon (1.5). 3. The 10kV two-stage series gap lightning flashover protector with insulators according to claim 1, characterized in that: the first stage gap is an air gap of 38-42 mm. 4. The 10kV two-stage series gap lightning flashover protector with insulators according to claim 1 or 3, characterized in that: the first stage gap is an air gap of 40 mm. 5. The 10kV two-stage series gap lightning flashover protector with insulators according to claim 1 or 2, characterized in that: the middle part of the zinc oxide arrester (2) is provided with a zinc oxide valve plate (2.5), the Two discharge balls (2.7) are connected to the zinc oxide valve piece (2.5), and a second-stage discharge gap of 6-10 mm is formed between the discharge balls (2.7). 6. The 10kV two-stage series gap lightning flashover protector with insulators according to claim 4, characterized in that a second-stage discharge gap of 7 mm is formed between the discharge balls (2.7). 7. The 10kV two-stage series gap lightning flashover protector with insulators according to claim 1 or 2, characterized in that: the low-voltage end of the zinc oxide arrester (2) is provided with a third connecting screw (2.6). 8. A 10kV two-stage series gap lightning flashover protector with insulators according to claim 1, characterized in that: the zinc oxide arrester (2) adopts a composite Zinc oxide arrester with out-of-band series gaps for preventing lightning overvoltage and cutting off power frequency freewheeling according to the two standards of "Jacket Metal Oxide Surge Arrester" and GB11032-2000 "AC Gapless Metal Oxide Surge Arrester".