CN2476021Y - Ultrasonic detector for testing vacuum degree of vacuum circuit breaker - Google Patents
Ultrasonic detector for testing vacuum degree of vacuum circuit breaker Download PDFInfo
- Publication number
- CN2476021Y CN2476021Y CN 00266162 CN00266162U CN2476021Y CN 2476021 Y CN2476021 Y CN 2476021Y CN 00266162 CN00266162 CN 00266162 CN 00266162 U CN00266162 U CN 00266162U CN 2476021 Y CN2476021 Y CN 2476021Y
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- vacuum
- vacuum circuit
- circuit breaker
- piezoelectric sensor
- circuit breakers
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Abstract
The utility model discloses a vacuum degree ultrasonic testing device for vacuum circuit breakers, in particular relates to an automatic ultrasonic testing. In order to test the vacuum degree of a vacuum circuit breaker by using the sound wave emission technology, the size of the vacuum degree is acquired indirectly through testing the intensity of the sound waves thereof. The testing device comprises a piezoelectric sensor and a detecting instrument which are connected via electricity. The piezoelectric sensor keeps in tight contact with the shell of the vacuum circuit breaker. Not changing the structure of vacuum circuit breakers and having no electric contact with the vacuum circuit breakers, the utility model has advantages of safety, reliability, practicality and good generality, therefore has a broad application prospect.
Description
The utility model relates to a kind of detection of vacuum tightness of vacuum circuit breaker, relates in particular to a kind of ultrasound wave and detects automatically.
Vacuum circuit breaker is because its unique arc extinction performance has obtained application widely in electric system.But vacuum circuit breaker is after its vacuum tightness reduces, if can not in time find, then when on-load is operated a switch, because can not arc extinguishing and can blast.Such explosion accident happens occasionally, and usually causes large-area power-cuts, and the safe operation of serious threat electric system.Therefore, working out a kind of high-caliber on-the-spot Vacuity of Vacuum Circuit Breakers pick-up unit that uses that is suitable for, is pressing for of vacuum circuit breaker fault diagnosis and maintenance, also is pressing for of automated diagnostic.
At present, it generally is to adopt " magnetron method " that the vacuum tightness of vacuum circuit breaker before dispatching from the factory detects, can detect vacuum tightness comparatively exactly, but this method and be not suitable for the requirement of on-the-spot operation maintenance.In recent years, " voltage add on method ", " the discharge current detection method " of domestic and international research, " detection method is disturbed in discharge ", " intermediate potential change-detection method " and " direct Detection Method ", though have his own strong points, but all can not satisfy the on-the-spot requirement that detects vacuum circuit breaker, i.e. the reliability of Cao Zuo security, simplification and detection, real-time, versatility etc.
Goal of the invention of the present utility model is to overcome the problem and shortage that prior art exists, developed a kind of Vacuity of Vacuum Circuit Breakers supersonic detection device, promptly utilize acoustic emission, realize detection in real time automatically, satisfy the needs of on-the-spot operation maintenance Vacuity of Vacuum Circuit Breakers.
Goal of the invention of the present utility model is achieved in that the sound wave phenomenon that is produced when promptly utilizing vacuum circuit breaker that discharge takes place, and measures the size of its vacuum tightness indirectly by detecting intensity of acoustic wave.Specifically, be shell maintenance close contact, thereby the sound wave of vacuum circuit breaker discharge generation is propagated by shell and received by piezoelectric sensor a piezoelectric sensor and vacuum circuit breaker; Piezoelectric sensor converts acoustic signals electric signal to and delivers to detecting instrument, after detecting instrument carries out processing and amplifying to electric signal, output contact signal to pulpit microcomputer is reported to the police, thereby the maintainer is taken appropriate measures in view of the above, avoids the generation of accident.
The utlity model has following advantage and good effect:
1. detection methods such as " voltage add on method " needs the plus high-pressure power supply, and this device does not then need the plus high-pressure power supply.
2. can accurately judge each phase fault, the processing accident is rapid.
3. this piezoelectric sensor does not have electrical communication with vacuum circuit breaker, and security is good.
4. vacuum tightness that can charged real-time detection vacuum circuit breaker, operation need not have a power failure.
5. in the testing process, operating personnel do not need can not cause the detection accident near vacuum circuit breaker.
6. cost is cheap than other detection method, promotes easily.
7. can go the rounds to detect to all vacuum circuit breakers of transformer station, be convenient to realize detecting robotization.
Describe in detail below in conjunction with drawings and Examples.
Fig. 1 is the utility model principle of work block diagram.
1-vacuum circuit breaker sectional schematic diagram wherein, 2-piezoelectric sensor, 3-detecting instrument; 1.1-electrode, protection screen in the middle of the 1.2-electrode bar, 1.3-, 1.4-insulating cylinder, 1.5-shell, 1.6-system voltage, 1.7-load.
Fig. 2 is the detecting instrument schematic block circuit diagram.
Wherein: 3.1-prime amplifier, 3.2 Hi-pass filters, 3.3-main amplifier, 3.4-current rectifying and wave filtering circuit, 3.5-comparator circuit, 3.6-output circuit.
Fig. 3 is detecting instrument 3 circuit theory diagrams.
1. vacuum circuit breaker 1 sectional schematic diagram as shown in Figure 1.According to theoretical research as can be known, the vacuum tightness of vacuum circuit breaker 1 just often has enough dielectric strengths between electrode 1.1 and the middle protection screen 1.3, therefore electric discharge phenomena can not take place.When its vacuum tightness is reduced to a certain degree, then electric discharge phenomena can take place; Along with the appearance of electric discharge phenomena, also can follow the generation of physical phenomenons such as light, heat and sound.This device detects the detection that realizes its vacuum tightness by the sound wave that is produced when electric discharge phenomena take place.Its principle of work is as follows: when the vacuum tightness of vacuum isolating switch 1 reduces, discharge between electrode 1.1 and the middle protection screen 1.3, and send sound wave.Though sound wave can not be propagated in a vacuum, can propagate by solid medium such as electrode bar 1.2, middle protection screen 1.3, insulating cylinder 1.4 and shell 1.5 etc.Based on this consideration, the utility model is with coupling agent or fastening clips, with the shell 1.5 maintenance close contact of piezoelectric sensor 2 with vacuum circuit breaker 1, piezoelectric sensor 2 is electrically connected mutually with detecting instrument 3, and realizes the purpose of this utility model.
2. as shown in Figure 2, this detecting instrument 3 is made up of prime amplifier 3.1, Hi-pass filter 3.2, main amplifier 3.3, current rectifying and wave filtering circuit 3.4, comparator circuit 3.5, output circuit 3.6 and is electrically connected successively.Its principle of work is as follows: when the vacuum tightness of vacuum circuit breaker 1 reduced, system voltage 1.6 was by protection screens 1.3 discharges in the middle of 1.1 pairs at the electrode, and the emission sound wave is propagated and be piezoelectric sensor 2 receptions through shell 1.5; Piezoelectric sensor 2 is converted to electric signal with acoustic signals.Amplify through prime amplifier 3.1, because this signal is very faint, be about the mV level, therefore the signal to noise ratio (S/N ratio) to prime amplifier 3.1 requires very high.The output signal of prime amplifier 3.1 is eliminated ground unrest or inhibition through Hi-pass filter 3.2 filtering, and the cutoff frequency of Hi-pass filter 3.2 is adjusted according to on-site actual situations.The signal of Hi-pass filter 3.2 send main amplifier 3.3 to amplify, obtain the accumulated level signal through current rectifying and wave filtering circuit 3.4 again, when this signal reaches the datum of comparator circuit 3.5, comparator circuit 3.5 outputs level signals, report to the police by output circuit 3.6 output contact signals to pulpit microcomputer, the prompting operator on duty takes corresponding measure to handle again.
3. embodiment of the present utility model as shown in Figure 3, the model of its piezoelectric sensor 2 is PZT-5, the model of each components and parts of detecting instrument and value Fig. 3 all provide.
Claims (2)
1, a kind of Vacuity of Vacuum Circuit Breakers supersonic detection device is characterized in that: be made up of and electrical connection mutually piezoelectric sensor (2) and detecting instrument (3), its piezoelectric sensor (2) keeps close contact with the shell (1.5) of vacuum disconnector (1).
2, Vacuity of Vacuum Circuit Breakers supersonic detection device according to claim 1 is characterized in that: detecting instrument (3) is made up of prime amplifier (3.1), Hi-pass filter (3.2), main amplifier (3.3), current rectifying and wave filtering circuit (3.4), comparator circuit (3.5), output circuit (3.6) and is electrically connected successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00266162 CN2476021Y (en) | 2000-12-29 | 2000-12-29 | Ultrasonic detector for testing vacuum degree of vacuum circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00266162 CN2476021Y (en) | 2000-12-29 | 2000-12-29 | Ultrasonic detector for testing vacuum degree of vacuum circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2476021Y true CN2476021Y (en) | 2002-02-06 |
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ID=33620307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00266162 Expired - Fee Related CN2476021Y (en) | 2000-12-29 | 2000-12-29 | Ultrasonic detector for testing vacuum degree of vacuum circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2476021Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181231A (en) * | 2014-07-07 | 2014-12-03 | 西安交通大学 | Device and method for measuring yield behavior of thin film material |
-
2000
- 2000-12-29 CN CN 00266162 patent/CN2476021Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181231A (en) * | 2014-07-07 | 2014-12-03 | 西安交通大学 | Device and method for measuring yield behavior of thin film material |
| CN104181231B (en) * | 2014-07-07 | 2017-01-11 | 西安交通大学 | Device and method for measuring yield behavior of thin film material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |