CN209525975U - A kind of overvoltage protection line pole type composite insulator device with multi-chamber gap - Google Patents

Abstract

The utility model discloses a kind of overvoltage protection line pole type composite insulator device with multi-chamber gap; including an insulator body; the insulator body both ends are respectively equipped with end metal fitting; end metal fitting positioned at insulator body bottom end is connected by the cross-arm of fastener and protected circuit, and the pin type steel cap of the insulator body and the top conductor line of protected circuit connect；Multiple built-in electrodes are equipped with inside the insulator body, a gas chamber is formed between two neighboring built-in electrode, the built-in electrode that two of them are located at end is connect with adjacent end metal fitting respectively, and internal cushion block is further respectively had between the built-in electrode and end metal fitting.Compared with prior art, the utility model is designed reasonably, installation is simple, and investment and operation expense are lower, the reclosing success rate after capable of effectively improving lightning fault, guarantees to operate normally.

Description

A kind of overvoltage protection line pole type composite insulator device with multi-chamber gap

Technical field

The utility model relates to over-voltage protection technique fields, and in particular to a kind of overvoltage protection with multi-chamber gap Line pole type composite insulator device, the protected working for medium voltage distribution network lightning surge.

Background technique

In thundercloud over the ground discharge process, the change dramatically of discharge channel surrounding space electromagnetic field can be maked somebody a mere figurehead nearby and be led Induced overvoltage is generated on line.Thundercloud possibly even directly hits distribution overhead line, generates high lightning surge.Work as thunder When electric overvoltage is more than certain numerical value, the flashover that will lead to distribution line even breaks, and causes the destruction of supply network, this will Directly affect the reliability of distribution system power supply.Therefore, it is necessary to the lightning surges of centering press-fitting network system, and protection to be taken to arrange It applies.Currently, the lightning surge of medium voltage distribution network system takes safeguard procedures, there are two main classes: blocking type safeguard procedures can be divided into The thunder and lightning for improving distribution line is resistant to insulation characterisitic, and direct lightning strike is intercepted using aerial earth wire, and the induction reduced on conducting wire is excessively electric Pressure, and installation leakage conductor carry out clamper by the overvoltage at protection insulator both ends；Diverting type safeguard procedures basic principle is Electric arc is dredged, does not allow electric arc calcination conducting wire.Including extending flashover path, being partially stripped insulated conductor, using portable protective gaps in parallel (being commonly called as arcing horn) etc..Above-mentioned safeguard procedures there are the problem of: aerial earth wire still has biggish thunderbolt accident probability, And Meteorological is huge；Installing Line type's MOA is a kind of very effective method, but its installation complexity, Operation expense is high；The core starting point for installing portable protective gaps in parallel is the reclosing success rate improved after lightning fault, skill Allow certain tripping rate with lightning strike in art, haves the defects that system of short duration power-off because of automatic reclosing.

Utility model content

To solve drawbacks described above, the purpose of the utility model is to provide a kind of overvoltage protection routes with multi-chamber gap Post composite insulators device, design rationally, are installed simply, and investment and operation expense are lower, can effectively improve lightning stroke event Reclosing success rate after barrier guarantees to operate normally.

In order to achieve the above objectives, the technical scheme adopted by the utility model is that: a kind of overvoltage with multi-chamber gap is protected Line pole type composite insulator device is protected, including an insulator body, the insulator body both ends are respectively equipped with end metal fitting, End metal fitting positioned at insulator body bottom end is connected by the cross-arm of fastener and protected circuit, the insulator body The connection of the top conductor line of pin type steel cap and protected circuit；It is equipped with multiple built-in electrodes inside the insulator body, adjacent two A gas chamber is formed between a built-in electrode, the built-in electrode that two of them are located at end connects with adjacent end metal fitting respectively It connects, internal cushion block is further respectively had between the built-in electrode and end metal fitting, wherein being located at the end on insulator body top The inside cushion block of fitting and built-in electrode stretches out the first discharge ball, the pin type at the top of insulator body to outside insulator body Protruding second discharge ball of steel cap, the gap between first discharge ball and the second discharge ball form main gap；In described It sets electrode to encapsulate inside insulator body by insulating layer, wherein built-in electrode is exposed with gas chamber junction, makes adjacent Multiple air microgaps being cascaded are formed between built-in electrode.

Further, the insulator body is connect with end metal fitting respectively by the internal supports insulative stick being equipped with, and is used In the enough tensile strengths of offer.

The encapsulation of the built-in electrode is realized by the way that insulating layer is arranged on the insulator body inner wall.

Series connection main gap and multiple air microgaps is respectively set in the utility model in multi-cavity post composite insulators, when When on distribution line with protected circuit insulator parallel running, the voltage of distribution system applies multi-cavity post composite insulators Onto series connection main gap and multiple air microgaps, because the equivalent capacitance amount of main gap is much smaller than built-in gap, system Voltage acts predominantly on main gap, when the lightning surge that system is subjected to is more than certain numerical value, gap breakdown, and power frequency continued flow Gap will be flowed through, electric arc will be set up between built-in electrode, and electric arc is established initial stage, and length is shorter, and in built-in microgap Between burn, resulting high temperature can be such that cavity bottom gas sharply expands, and air pressure increased dramatically；Since chamber is single-ended opens Mouth structure, hyperbar is horizontal blow effect under, cool electric arc and electric arc be elongated to other than built-in microgap, the impedance of arc road becomes Greatly, power frequency continued flow is cut off in half of frequency cycle by blow-out, ensure that safety.

The utility model is used at the same time as pillar insulator, and the insulating bar inside multi-cavity post composite insulators provides Enough bending strengths, can play the role of support to the conducting wire on top.

Compared with prior art, the utility model is easier to pacify using the gap that fixed main gap is adjusted than other needs Dress, the long short precision of main gap is easier to control, while the utility model is suitable for low cost, is suitble to high-volume large-scale production； Have the characteristics that manufacture craft is simple, at low cost, lightning protection performance is strong, operation and maintenance are stablized, and is suitable for being widely popularized；It throws Maintenance cost is extremely low after entering operation, substantially belongs to non-maintaining.

Detailed description of the invention

Below according to accompanying drawings and embodiments, the structure and features of the utility model is further described.

Fig. 1 is the structural scheme of mechanism of the utility model.

Fig. 2 is that Fig. 1 removes the left view after cross-arm and conducting wire.

In attached Fig. 1 and 2, the top conductor line of 1. protected circuits, 2. insulator bodies, 3. cross-arms, 4. insulator bodies Pin type steel cap, 5. first discharge balls, 6. second discharge balls, 7. end metal fittings, 8. fasteners.

Specific embodiment

It is an embodiment of the utility model referring to attached drawing 1 and Fig. 2, discloses a kind of overvoltage with multi-chamber gap Protection circuit post composite insulators device, including an insulator body, the insulator body both ends are respectively equipped with end gold Tool, the end metal fitting positioned at insulator body bottom end are connected by the cross-arm of fastener and protected circuit, the insulator sheet The pin type steel cap of body and the top conductor line of protected circuit connect；Multiple built-in electrodes, phase are equipped with inside the insulator body A gas chamber is formed between adjacent two built-in electrodes, the built-in electrode that two of them are located at end is golden with adjacent end respectively Tool connection, further respectively has internal cushion block between the built-in electrode and end metal fitting, wherein being located at insulator body top The inside cushion block of end metal fitting and built-in electrode stretches out the first discharge ball to outside insulator body, at the top of insulator body Protruding second discharge ball of pin type steel cap, the gap between first discharge ball and the second discharge ball form main gap, the It is filled between one discharge ball and the fixed electrode of the second discharger using insulating materials；The encapsulation of the built-in electrode is by institute It states and insulating layer is set on insulator body inner wall to realize, wherein built-in electrode is exposed with gas chamber junction, makes adjacent Multiple air microgaps being cascaded are formed between built-in electrode.

The insulator body is connect with end metal fitting respectively by the internal supports insulative stick being equipped with, for providing enough Tensile strength.

The utility model manufacturing method is simple, and the installation cost made is low, small in size conducive to transport.With tradition Series gap metal oxide arrester compare, device using multi-chamber arc extinguishing technology without using metal oxide it is non- Linear resistance piece keeps device performance more stable, and there is no the danger exploded because absorption energy is excessively high；The device has cost The features such as low, easy for installation, operation expense is low, is particularly suitable for large-scale promotion application in power distribution network lightning protection.

Described above is only the preferred embodiment of the utility model, and above-mentioned specific embodiment is not to the utility model Limitation, retouching, modification or the equivalent replacement that all those skilled in the art are made as described above belong to this reality With novel protection scope.

Claims (3)

1. a kind of overvoltage protection line pole type composite insulator device with multi-chamber gap, including an insulator body, Be characterized in that: the insulator body both ends are respectively equipped with end metal fitting, and the end metal fitting positioned at insulator body bottom end passes through The connection of the cross-arm of fastener and protected circuit, the pin type steel cap of the insulator body and the top conductor line of protected circuit connect It connects；It is equipped with multiple built-in electrodes inside the insulator body, forms a gas chamber between two neighboring built-in electrode, wherein Two built-in electrodes for being located at end are connect with adjacent end metal fitting respectively, are also divided between the built-in electrode and end metal fitting Not She You internal cushion block, wherein being located at the end metal fitting on insulator body top and the inside cushion block of built-in electrode to insulator sheet External to stretch out the first discharge ball, protruding second discharge ball of pin type steel cap at the top of insulator body, described first puts Gap between electric ball and the second discharge ball forms main gap；The built-in electrode is sealed inside insulator body by insulating layer Dress, wherein built-in electrode is exposed with gas chamber junction, makes to form multiple skies being cascaded between adjacent built-in electrode Gas microgap.

2. the overvoltage protection line pole type composite insulator device according to claim 1 with multi-chamber gap, special Sign is: the insulator body is connect with end metal fitting respectively by the internal supports insulative stick being equipped with.

3. the overvoltage protection line pole type composite insulator device according to claim 1 with multi-chamber gap, special Sign is: the encapsulation of the built-in electrode is realized by the way that insulating layer is arranged on the insulator body inner wall.