CN2386448Y

CN2386448Y - Multifunctional on-line monitor for lighting protector

Info

Publication number: CN2386448Y
Application number: CN 99229282
Authority: CN
Inventors: 岳建民; 岳志良
Original assignee: Individual
Current assignee: FUAN ELECTRICAL Co Ltd NANJING
Priority date: 1999-08-27
Filing date: 1999-08-27
Publication date: 2000-07-05
Anticipated expiration: 2009-08-27

Abstract

The utility model relates to a multifunctional on-line monitor of a lightning protector, which is characterized in that on the basis of the existing on-line monitor of a lightning protector, a leakage current detection device on the outer surface of a porcelain sleeve is added to specifically detect the dirt degree of the outer surface of the porcelain sleeve; when the lightning protector is monitored on line, the utility model can avoid leading to measurement error due to the leakage current of the outer surface of the porcelain sleeve. The utility model has the advantages of simple and reasonable structure, stable and reliable performance, etc., and is an upgrade product of the existing on-line monitor of a lightning protector.

Description

The multi-functional on-line monitoring device of lightning arrester

The utility model relates to a kind of monitoring device, and particularly a kind of monitoring is installed in the device of the lightning arrester performance on the high-voltage fence.

Lightning arrester in the high-voltage fence is that the protection power equipment exempts from the vitals that superpotential particularly is struck by lightning and is damaged, and the reliability service of himself will directly have influence on the safety of high-voltage fence.The lightning arrester that is used for high-voltage fence is at present mainly selected valve-type arrester for use; its structure mainly contains two kinds; a kind of is to be in series by the sparking distance and the patty silit valve block that are contained in the insulator; be connected between protected circuit and the earth; the effect of sparking distance is that valve block and electric system are isolated; the resistance value of valve block with flow through current related; the big more resistance of electric current is more little; when running into superpotential; sparking distance then punctures, and makes lightning current leak into the earth to reduce superpotential amplitude.After superpotential is gone over, must in half cycle, power frequency continued flow be blocked, recover normal condition then.If lightning arrester inside exists valve block to make moist or sparking distance can not arc extinguishing etc. during defective, lightning arrester will be damaged, and can set off an explosion when serious, causes the electrical network major accident; Use now more is a kind ofly to be called valve block that material such as zinc paste makes and to be assembled in metal oxide arrester in the insulator, the non-linear behaviour of this valve block is better, under working voltage, its leakage current is a milliampere level, so can directly use without sparking distance, in a single day this lightning arrester makes moist or is aging, just will cause the electrical network major accident.So, necessary running check lightning arrester, pinpoint the problems and in time to handle, generally take at present the method for the leakage current by measuring lightning arrester to check its performance, detect and discharge counter as No. 93111792.5 disclosed lightning arrester leakances of Chinese patent, also be lightning arrester on-line monitoring device, be serially connected between arrester ground connecting line and the earth, just can understand the leakage current number of times whether normal also record is struck by lightning of this lightning arrester immediately.But because lightning arrester is installed in outdoor, be subjected to wind and weather for a long time, the insulator appearance is polluted and reduced its insulating property, and the insulation resistance of this insulator appearance will be in parallel with the element in the insulator, cause the leakage current generating error of being surveyed, will lose the effect of its on-line monitoring when serious.

To be that design is a kind of can detect lightning arrester leakance and record thunderbolt number of times to the purpose of this utility model, can detect the multi-functional on-line monitoring device of lightning arrester of insulator outside surface pollution level again.

Technical measures of the present utility model be existing comprise that lightning arrester leakance detects and the basis of the lightning arrester on-line monitoring device of discharge counter on, increase an insulator outside surface leak current detection device and can detect insulator outside surface pollution level, this insulator outside surface leak current detection device comprises that a becket exchanges milliammeter with one, the becket banding is in the bottom of lightning arrester insulator outside surface, becket is connected with an end of the lead interchange milliammeter interior with being installed in the monitor housing, exchanges the other end body contact body of milliammeter.The also available dc milliammeter of described interchange milliammeter replaces, and its circuit generally includes a dc milliammeter PA ₁, a bridge rectifier U ₁, a capacitor C ₁With two adjustment resistance R ₁, R ₂, its annexation is bridge rectifier U ₁Input end be connected bridge rectifier U with banding at the basifacial becket of lightning arrester insulator appearance with lead ₁Another output terminal be connected bridge rectifier U with housing ₁The positive pole of output terminal connects capacitor C ₁, resistance R ₁With dc milliammeter PA ₁Positive pole, dc milliammeter PA ₁Negative pole and resistance R ₂Connect resistance R ₁And R ₂And capacitor C ₁The other end all with bridge rectifier U ₁The negative pole of output terminal connects.

Accompanying drawing 1 is a contour structures synoptic diagram of the present utility model;

Accompanying drawing 2 is circuit connecting relation figure of the present utility model.

Referring to accompanying drawing 1,1 among the figure is the lightning arrester insulator, the 2nd, and becket, the 3rd, the base of lightning arrester, the 4th, insulator tracking current connecting line, the 5th, conducting rod, the 6th, housing, the 7th, operation counter, the 8th, the filthy table of insulator outside surface electric leakage milliammeter or title, the 9th, lightning arrester leakance milliammeter.Referring to Fig. 2, insulator outside surface leak current detection device wherein comprises a becket and by a dc milliammeter PA ₁, a bridge rectifier U ₁, a capacitor C ₁With two adjustment resistance R ₁, R ₂The interchange milliammeter of forming, its annexation is bridge rectifier U ₁Input end be connected bridge rectifier U with banding at the basifacial becket of lightning arrester insulator appearance with lead ₁Another output terminal be connected bridge rectifier U with housing ₁The positive pole of output terminal connects capacitor C ₁, resistance R ₁With dc milliammeter PA ₁Positive pole, dc milliammeter PA ₁Negative pole and resistance R ₂Connect resistance R ₁And R ₂And capacitor C ₁The other end all with bridge rectifier U ₁The negative pole of output terminal connects.Other parts among Fig. 2 are that lightning arrester leakance detects and discharge counter, comprise valve block formula flow passage component B, bridge rectifier U ₂, operation counter PC, dc milliammeter PA ₂, stabilivolt W, capacitor C ₂, three resistance R ₃-R ₅, its annexation is: valve block formula flow passage component B is connected between conducting rod and the housing bridge rectifier U ₂Input end and resistance R ₃Be connected in parallel on the two ends of valve block formula flow passage component B after the series connection, bridge rectifier U ₂The positive pole of output terminal connect capacitor C ₂With operation counter PC, the other end of operation counter PC and dc milliammeter PA ₂Positive pole and stabilivolt W and resistance R ₅Connect dc milliammeter PA ₂Negative pole and resistance R ₄Connect the stabilivolt W other end, capacitor C ₂The other end, resistance R ₄And R ₅The other end all with bridge rectifier U ₂The negative pole of output terminal connects.During installation, diversion rod 5 is connected with lightning arrester base, housing 6 ground wires, the bridge rectifier U in the insulator outside surface leak current detection device ₁Input end be connected at the basifacial becket 2 of lightning arrester insulator 1 appearance with banding with lead.During operate as normal, the resistance of valve block B is very big, the leakage current of lightning arrester after rectification by milliammeter PA ₂Measure and show that the filthy situation of the insulator outside surface of lightning arrester is by milliammeter PA ₁Measure its leakage current, the scale of this milliammeter can be with representing that the little west of filthy degree value conductivity represents, the scale when little west surpasses certain limit, and then expression is sent out, the insulated porcelain sleeve contamination outside the transformer station reached certain gradation for surface pollution zone.Because the internal resistance of this circuit is very little, be equivalent to lightning arrester insulator outside surface short circuit ground connection, so the pollution level that its leakage current reacted has not just influenced the detection of lightning arrester leakance yet.When thunderbolt took place, valve block B was low resistance state, and with the lightning current inflow the earth of lightning arrester, the pulse voltage that this big electric current produces when flowing through valve block B is through U ₂Rectification makes operation counter PC beat numeral and counts record thunderbolt number of times.

The multi-functional on-line monitoring device of arrester of the present utility model can record the number of times that arrester is struck by lightning, again Can detect respectively the pollution level of lightning arrester leakance and insulator, can avoid when arrester is carried out on-line monitoring The measure error that existing monitor causes because of the electric leakage of insulator appearance again can be with the filthy journey on arrestor porcelain bushing surface Degree directly shows to have the advantages such as simple and reasonable, stable and reliable for performance with ammeter, is existing arrester The upgraded product of on-line monitoring device.

Claims

1. multi-functional on-line monitoring device of lightning arrester, comprise the lightning arrester on-line monitoring device of forming by leakage meter and excess current counter and flow passage component and housing, it is characterized in that also comprising insulator outside surface leak current detection device, described insulator outside surface leak current detection device comprises that a becket exchanges milliammeter with one, the becket banding is in the bottom of lightning arrester insulator outside surface, becket is connected with an end of the lead interchange milliammeter interior with being installed in the monitor housing, exchanges the other end body contact body of milliammeter.

2. the multi-functional on-line monitoring device of lightning arrester as claimed in claim 1 is characterized in that exchanging milliammeter and comprises a dc milliammeter PA ₁, a bridge rectifier U ₁, a capacitor C ₁With two adjustment resistance R ₁, R ₂, its annexation is bridge rectifier U ₁Input end be connected bridge rectifier U with banding at the basifacial becket of lightning arrester insulator appearance with lead ₁Another output terminal be connected bridge rectifier U with housing ₁The positive pole of output terminal connects capacitor C ₁, resistance R ₁With dc milliammeter PA ₁Positive pole, dc milliammeter PA ₁Negative pole and resistance R ₂Connect resistance R ₁And R ₂And capacitor C ₁The other end all with bridge rectifier U ₁The negative pole of output terminal connects.