CN2032726U - Tester for isolator of electrostatic induction type ac electric transmission lines - Google Patents
Tester for isolator of electrostatic induction type ac electric transmission lines Download PDFInfo
- Publication number
- CN2032726U CN2032726U CN 88200640 CN88200640U CN2032726U CN 2032726 U CN2032726 U CN 2032726U CN 88200640 CN88200640 CN 88200640 CN 88200640 U CN88200640 U CN 88200640U CN 2032726 U CN2032726 U CN 2032726U
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- insulator
- sensitive surface
- electrostatic induction
- electrode
- isolator
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Abstract
The utility model relates to a special-purpose apparatus which is used for electrically checking poor insulator in the operation of alternating current transmission line of electrical power system. According to the principle of electrostatic induction, the alternating current voltage on the measured insulator is guided to a couple of parallel-plate electrodes in the apparatus to form an alternating electric field. A current signal is induced on a measure inductive surface. By processing and analyzing the signal, whether the insulator is stand or fall can be judged. The apparatus has advantages that the judgment is accurate and the operation is convenient. A course of discharge does not exist in the measurement. The utility model is benefit for the safe operations of a circuitry and an insulator.
Description
The utility model relates to the instrument of the charged detection poor insulator of a kind of electric system AC electricity transmission circuit.
The sparking distance discharge is adopted in the detection of electric system poor insulator at present.Rely on voltage discharge on a bead ball crack that mixes up sparking voltage in advance on the insulator to judge the quality of insulator.Under the situation of voltage than low and daylight, difficulty judges whether discharge.In the measurement of short insulator chain, during detected insulator arc-over, the voltage on this sheet insulator will be added on other insulator.This just may cause the damage or the insulator short circuit of insulator, and accident causes power failure.
The utility model is the problem that exists in the quality with sparking distance discharge examination insulator in order to solve, and makes the detection accuracy of judgement of insulator, is not subjected to the influence of voltage and daylight, alleviates the working strength when measuring, and increases work efficiency.When measuring, electric discharge phenomena do not take place, thereby guaranteed the safe operation of insulator and transmission line of electricity.
Structure of the present utility model is the electrostatic induction formula.Its principle of work is seen accompanying drawing 1.Voltage on the tested insulator is directed on pair of parallel plate electrode (1), (2), forms electric field between two electrodes.Electrode is divided into potential electrode (1) and auxiliary electrode (2).Potential electrode (1) the middle part have one to measure sensitive surface (4).Sensitive surface (4) insulate with electrode (1) and in one plane, it links through a sample resistance (6) and shell (7).During measurement, the alternating voltage on the tested insulator produces electric field between two electrodes (1), (2), goes up one of induction and the linear induced current of electric field intensity in the sensitive surface (4) of potential electrode (1).When this electric current is flowed through sample resistance (6), on sample resistance, obtain a voltage signal.Voltage signal compares through comparer (9) with a predefined current potential after amplifier (8) amplifies, and judges that whether tested voltage is greater than this setting value.When its during greater than setting value, provide an auditory tone cues, represent that tested insulator is good, born operating voltage; When its then voiceless sound prompting during less than setting value, represent that tested insulator damages, does not bear operating voltage.
In order to protect internal circuit, sensitive surface can be divided into inside and outside two-layer as Fig. 2.Outer sensitive surface (5) is not got in touch with internal circuit, adopts insulation (11) between internal induction face (4) and the outer sensitive surface (5), and internal induction face (4) links to each other with shell (7) by sample resistance (6).Internal induction face (4) produces induced current signal, operate as normal from outer sensitive surface (5) induction during measurement.When accidental external fault took place, the internal circuit of instrument had been protected in the insulation between ectonexine (11).
Because measuring-signal of the present utility model is to be produced by the electric field induction between two plate electrodes (1), (2), the distance between two plate electrodes obtains enough big, can satisfy the maximum distribution voltage that present alternating current circuit insulator is born.So the electric discharge phenomena between can generating electrodes when measuring, thereby guaranteed the safe operation of circuit and insulator.
During measurement, this instrument is fixed on the insulating bar, wiring fork is fixed on the Metallic rod (12), (13) of instrument.The operator holds control lever wiring fork fork is carried out the insulator detection at the two ends of detected insulator.
Use description of drawings embodiment below:
Fig. 1, measuring principle figure
1--potential electrode 2--assists electroplax 3--insulation supporter 4--sensitive surface 6-sample resistance 7--metal shell 8--amplifier
9--comparer 10--alarm 12, the 13--Metallic rod
Fig. 2, double-deck sensitive surface schematic diagram
The outer sensitive surface of 4--internal induction face 5--
Insulant between the inside and outside sensitive surface of 11--
Among Fig. 1, electrode (1) is fixed on the metal shell (7), and Metallic rod (12) links with metal shell (7).Metallic rod (13) links with electrode (2).Voltage causes on the electrode through Metallic rod and shell.Sensitive surface (4) is fixed on electrode (1) middle part, and insulate with electrode (1).Internal circuit is contained in the shell (7), and an end of sample resistance (6) and sensitive surface (4) link, and the other end and metal shell (7) link.
Among Fig. 2, outer sensitive surface (5) is fixed on electrode (1) middle part, with electrode (1) on same plane, and insulation with it.Internal induction face (4) relies on insulant (11) insulation with outer sensitive surface (5).Internal induction face (4) and electrode (1) insulation.Sample resistance (6) one ends and internal induction face (4) link, and the other end and shell (7) link.
Claims (2)
1, electrostatic induction formula transmission line of alternation current insulator detects table, form electrostatic structure by pair of parallel plate electrode (1), (2), it is characterized by one and measure the centre that sensitive surface (4) is contained in plate electrode (1), and with its in same plane and insulation, sensitive surface (4) links to each other with shell (7) through a sample resistance (6).
2, electrostatic induction formula transmission line of alternation current insulator detection table according to claim 1, but it is characterized by sensitive surface individual layer or double-decker, and double-deck internal layer links to each other internal layer and outer layer insulation through resistance (6) with shell (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88200640 CN2032726U (en) | 1988-01-22 | 1988-01-22 | Tester for isolator of electrostatic induction type ac electric transmission lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88200640 CN2032726U (en) | 1988-01-22 | 1988-01-22 | Tester for isolator of electrostatic induction type ac electric transmission lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2032726U true CN2032726U (en) | 1989-02-15 |
Family
ID=4836025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88200640 Pending CN2032726U (en) | 1988-01-22 | 1988-01-22 | Tester for isolator of electrostatic induction type ac electric transmission lines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2032726U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986168A (en) * | 2010-10-19 | 2011-03-16 | 郑文秀 | Insulating property monitoring device and method of high-voltage switching apparatus |
-
1988
- 1988-01-22 CN CN 88200640 patent/CN2032726U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986168A (en) * | 2010-10-19 | 2011-03-16 | 郑文秀 | Insulating property monitoring device and method of high-voltage switching apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned | ||
| WD01 | Invention patent application deemed withdrawn after publication |