CN203405549U - Breaker switch-on-off spring ultrasonic monitoring device - Google Patents
Breaker switch-on-off spring ultrasonic monitoring device Download PDFInfo
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- CN203405549U CN203405549U CN201320519498.3U CN201320519498U CN203405549U CN 203405549 U CN203405549 U CN 203405549U CN 201320519498 U CN201320519498 U CN 201320519498U CN 203405549 U CN203405549 U CN 203405549U
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- spring
- circuit breaker
- monitoring device
- piezoelectric vibration
- magnet
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
A breaker switch-on-off spring ultrasonic monitoring device designed by the utility model comprises a piezoelectric vibration sensor, a preamplifier, a high pass filter, a main signal amplifier, a rectifier filter, a comparison circuit, a computer, an alarm and a magnet, wherein the signal output end of the piezoelectric vibration sensor is connected with the high pass filter via the preamplifier, the high pass filter is connected with the rectifier filter via the main signal amplifier, and the rectifier filter is connected with an output circuit via the comparison circuit; the computer is connected with the output circuit and the alarm, the piezoelectric vibration sensor is absorbed on a breaker shell equipped with a spring via the magnet, and a coupling agent coating is arranged between the breaker shell and the magnet. The breaker switch-on-off spring ultrasonic monitoring device on-line monitors a sound wave generated when a breaker spring generates fatigue crack based on a sound emission technology, thereby achieving the purpose of spring fault early warning.
Description
Technical field
The utility model relates to electrical equipment malfunction on-line monitoring technique field, refers to particularly a kind of spring of circuit breaker ultrasonic monitoring device.
Technical background
Primary cut-out is very common in electric system, and it plays the effect of control and protection to electric system, is the very important primary equipment of electric system.Isolating switch is the switchgear of electric system, when electric system is under normal operating conditions, isolating switch remains static, than other system equipment, isolating switch not only has extreme high reliability also will have moving property of wink, when need of work or accident generation, move rapidly, power-supply device is switched on or off.Breaker operation mechanism is the core of isolating switch, and technician finds in long-term production practices, and the actuation time of breaker operation mechanism all can be because of fatigue aging, get rusty and the problem such as distortion changes, and then causes power grid accident.
Switching-in spring is the energy-storage travelling wave tube of breaker operation mechanism, is the vitals that determines sulfur hexafluoride breaker performance.Have investigation to show, switching-in spring fault has accounted for the significant proportion of circuit breaker failure.Under normal operation, breaker closing spring is always in stretching or compressing under the deformed state of energy storage, when carrying out circuit-breaker switching on-off operation, long-term spring under deformed state can produce fatigue effect unavoidably, can cause the tripping of divide-shut brake spring and nonaction like this, the accidents such as switching-in spring fracture even occur.In recent years, the many provinces of China have because of switching-in spring performance degradation, and power grid accident even occurs the circuit breaker failure causing.When the isolating switch working time, constantly increase, the performance of divide-shut brake spring can be deteriorated gradually, and isolating switch has sudden because of the fault that spring fatigue produces.Therefore, the research to spring fault monitoring system, not only even all significant to whole power grid security to breaker safe.At present, the device of also spring of circuit breaker not being monitored, makes isolating switch have serious potential safety hazard.
Utility model content
The purpose of this utility model will provide a kind of spring of circuit breaker ultrasonic monitoring device exactly, and this device has proposed to utilize acoustic emission, the sound wave that on-line monitoring breaker spring produces when there is fatigue break, thus reach the object of spring fault pre-alarming.
For realizing this object, the spring of circuit breaker ultrasonic monitoring device that the utility model is designed, it is characterized in that: it comprises piezoelectric vibration sensors, prime amplifier, Hi-pass filter, main signal amplifier, rectifier filer, comparator circuit, output circuit, computer, alarm and magnet, wherein, the signal output part of described piezoelectric vibration sensors connects Hi-pass filter by prime amplifier, described Hi-pass filter connects rectifier filer by main signal amplifier, described rectifier filer connects output circuit by comparator circuit, described output circuit connects computer, described computer connects alarm, described piezoelectric vibration sensors is being provided with on the case for circuit breaker of spring by magnet adsorption, between above-mentioned case for circuit breaker and magnet, be provided with couplant coating.
The utlity model has following advantage:
1) this monitoring device and high voltage electric equipment do not electrically contact, to make an inspection tour and testing staff without any harm, safe and reliable.
2) the utility model simple to operate, cheap, easily by operating personnel, grasped, easily promote.
3) at present breaker spring status monitoring is not also had to effective method and monitoring equipment, this utility model has just in time made up this blank on the one hand.
4) the utility model does not need that breaker operation mechanism is had to any change, is applicable to all types of isolating switchs, and the scope of application is very extensive.
5) device of the present utility model can charged Real-Time Monitoring breaker spring state, can realize hot line job.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein, 1-piezoelectric vibration sensors, 2-prime amplifier, 3-Hi-pass filter, 4-main signal amplifier, 5-rectifier filer, 6-comparator circuit, 7-output circuit, 8-magnet, 9-spring, 10-case for circuit breaker, 11-couplant coating, 12-alarm, 13-computer.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
When breaker spring while producing phenomenon of rupture, can be attended by sending of acoustic signals due to overtired.By detecting acoustic signals, reach the object of early warning fault.Isolating switch, when normal condition, does not have sound wave to send, and when fault, will send sound wave.Specifically, in the case surface of isolating switch, a piezoelectric vibration sensors is set, like this, the sound wave producing when spring breaks down is delivered to piezoelectric vibration sensors 1 by case for circuit breaker 10.Piezoelectric vibration sensors 1 is transformed into the acoustical signal receiving electric signal and is transported to checkout equipment again; signal detection apparatus amplifies electric signal again; after filtering, deliver to again in the computer 13 of micro computer monitoring chamber; produce and report to the police; thereby remind staff to carry out equipment inspection replacing, reach the object of protection safe operation of power system.
Specifically, spring of circuit breaker ultrasonic monitoring device as shown in Figure 1, it comprises piezoelectric vibration sensors 1, prime amplifier 2, Hi-pass filter 3, main signal amplifier 4, rectifier filer 5, comparator circuit 6, output circuit 7, computer 13, alarm 12 and magnet 8, wherein, the signal output part of described piezoelectric vibration sensors 1 connects Hi-pass filter 3 by prime amplifier 2, described Hi-pass filter 3 connects rectifier filer 5 by main signal amplifier 4, described rectifier filer 5 connects output circuit 7 by comparator circuit 6, described output circuit 7 connects computer 13, described computer 13 connects alarm 12, described piezoelectric vibration sensors 1 is adsorbed on the case for circuit breaker 10 that spring 9 is installed by magnet 8, between above-mentioned case for circuit breaker 10 and magnet 8, be provided with couplant coating 11.
In technique scheme, between piezoelectric vibration sensors 1 and case for circuit breaker 10, by magnet 8, be connected, magnet 8 can well be transmitted to ultrasonic signal in piezoelectric vibration sensors 1 by case for circuit breaker 10, substantially there is no the loss of signal, and the real-time of ultrasonic signal is good.Simultaneously, adopt the fixed form of magnet 8 absorption can not cause damage to case for circuit breaker 10, in addition, adopt the fixed form of magnet 8 absorption that the dismounting of piezoelectric vibration sensors 1 and installation are more prone to, technician is more prone to the monitoring of spring of circuit breaker, and 8 pairs of isolating switchs of magnet are without any interference.
In technique scheme, the sensing part of piezoelectric vibration sensors 1 adopts piezoelectric ceramic wafer.The surge frequency range of described piezoelectric ceramic wafer is at 20～60kHz.Above-mentioned piezoelectric ceramic wafer adopts the mode of disk thickness flexure vibration, like this piezoelectric vibration sensors have highly sensitive, without copper cash and magnet, without magnetic field, disseminate excessive, the advantage such as cost is low, little power consumption.
In technique scheme, described couplant coating 11 is lithium base grease layer.The thickness range of this lithium base grease layer is 0.9～1.1 millimeter.The ultrasound wave that the lithium base grease layer of above-mentioned design can produce divide-shut brake spring is well coupled in piezoelectric vibration sensors 1, this lithium base grease layer is used for getting rid of the probe of piezoelectric vibration sensors 1 and the air between case for circuit breaker 10, has improved the accuracy of piezoelectric vibration sensors 1 ultrasound examination.
A spring of circuit breaker ultrasonic monitoring method for above-mentioned spring of circuit breaker ultrasonic monitoring device, it comprises the steps:
Step 1: the vibration signal producing in real time on case for circuit breaker 10 is responded to by piezoelectric vibration sensors 1 by couplant coating 11 and magnet 8;
Step 2: described piezoelectric vibration sensors 1 converts the vibration signal sensing to electrical vibration signal, and be delivered to prime amplifier 2;
Step 3: prime amplifier 2 is enlarged into fiduciary level vibration signal by electrical vibration signal, and be delivered to Hi-pass filter 3;
Step 4: 3 pairs of fiduciary level vibration signals of described Hi-pass filter carry out filtering processing, remove the low-frequency disturbance in fiduciary level vibration signal, and are delivered to main signal amplifier 4;
Step 5: the fiduciary level vibration signal that 4 pairs, described main signal amplifier is removed after low-frequency disturbance amplifies processing again, and be delivered to rectifier filer 5;
Step 6: described rectifier filer 5 is converted to comparatively level and smooth DC vibrating signal by the vibration signal of interchange, and be delivered to comparator circuit 6;
Step 7: the vibration signal scope when presetting spring of circuit breaker normal operation in described comparator circuit 6 and fracture occurring, in the time of within the scope of the vibration signal of DC vibrating signal in being transported to comparator circuit 6 when this predefined spring of circuit breaker normal operation and generation fracture, DC vibrating signal enters output circuit 7 by comparator circuit 6, in the time of within the scope of the vibration signal of DC vibrating signal in being transported to comparator circuit 6 not in the normal operation of predefined spring of circuit breaker with while there is fracture, assert that DC vibrating signal is subject to extraneous vibration and disturbs, signal transmission is terminated,
Step 8: described output circuit 7 passes to computer 13 by the DC vibrating signal by comparator circuit 6;
Step 9: first DC vibrating signal is normalized and synchronous processing described computer 13 is interior, then has carried out normalization and the synchronous vibration signal of processing carries out envelope extraction to above-mentioned, envelope extraction process realizes by Hilbert transform.Then signal after above-mentioned envelope extraction is carried out to envelope signal reconstruct and continuous wavelet transformation, then the above-mentioned signal carrying out after envelope signal reconstruct and continuous wavelet transformation is carried out to envelope analysis by Fast Fourier Transform (FFT), then the signal envelope collection of illustrative plates above-mentioned envelope analysis being obtained and the ultrasonic collection of illustrative plates of predefined spring of circuit breaker fracture critical conditions compare, when comparative result does not exceed critical conditions, signal cancels, no longer to next step, transmit, when comparative result exceeds critical conditions, computer 13 sends alerting signal to alarm 12, finally by alarm 12, complete warning, when operator on duty finds failure warning, make in time corresponding decision-making, can effectively avoid the generation of power grid accident.
The content that instructions is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (5)
1. a spring of circuit breaker ultrasonic monitoring device, it is characterized in that: it comprises piezoelectric vibration sensors (1), prime amplifier (2), Hi-pass filter (3), main signal amplifier (4), rectifier filer (5), comparator circuit (6), output circuit (7), computer (13), alarm (12) and magnet (8), wherein, the signal output part of described piezoelectric vibration sensors (1) connects Hi-pass filter (3) by prime amplifier (2), described Hi-pass filter (3) connects rectifier filer (5) by main signal amplifier (4), described rectifier filer (5) connects output circuit (7) by comparator circuit (6), described output circuit (7) connects computer (13), described computer (13) connects alarm (12), described piezoelectric vibration sensors (1) is adsorbed on the case for circuit breaker (10) that spring (9) are installed by magnet (8), between above-mentioned case for circuit breaker (10) and magnet (8), be provided with couplant coating (11).
2. spring of circuit breaker ultrasonic monitoring device according to claim 1, is characterized in that: the sensing part of described piezoelectric vibration sensors (1) adopts piezoelectric ceramic wafer.
3. spring of circuit breaker ultrasonic monitoring device according to claim 2, is characterized in that: the surge frequency range of described piezoelectric ceramic wafer is at 20～60kHz.
4. spring of circuit breaker ultrasonic monitoring device according to claim 1, is characterized in that: described couplant coating (11) is lithium base grease layer.
5. spring of circuit breaker ultrasonic monitoring device according to claim 4, is characterized in that: the thickness range of described lithium base grease layer is 0.9～1.1 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320519498.3U CN203405549U (en) | 2013-08-23 | 2013-08-23 | Breaker switch-on-off spring ultrasonic monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320519498.3U CN203405549U (en) | 2013-08-23 | 2013-08-23 | Breaker switch-on-off spring ultrasonic monitoring device |
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| Publication Number | Publication Date |
|---|---|
| CN203405549U true CN203405549U (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320519498.3U Expired - Lifetime CN203405549U (en) | 2013-08-23 | 2013-08-23 | Breaker switch-on-off spring ultrasonic monitoring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412258A (en) * | 2013-08-23 | 2013-11-27 | 国家电网公司 | Breaker switch-on-off gate spring ultrasound monitoring device and method |
| CN104316600B (en) * | 2014-11-14 | 2017-06-30 | 国家电网公司 | The energy-stored spring faulted condition detection means and method of a kind of spring actuator mechanism circuit-breaker |
| CN108414075A (en) * | 2018-03-09 | 2018-08-17 | 国网陕西省电力公司电力科学研究院 | A kind of high-voltage circuitbreaker fastening bolt loosens detection device and detection method |
-
2013
- 2013-08-23 CN CN201320519498.3U patent/CN203405549U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412258A (en) * | 2013-08-23 | 2013-11-27 | 国家电网公司 | Breaker switch-on-off gate spring ultrasound monitoring device and method |
| CN103412258B (en) * | 2013-08-23 | 2015-06-17 | 国家电网公司 | Breaker switch-on-off gate spring ultrasound monitoring device and method |
| CN104316600B (en) * | 2014-11-14 | 2017-06-30 | 国家电网公司 | The energy-stored spring faulted condition detection means and method of a kind of spring actuator mechanism circuit-breaker |
| CN108414075A (en) * | 2018-03-09 | 2018-08-17 | 国网陕西省电力公司电力科学研究院 | A kind of high-voltage circuitbreaker fastening bolt loosens detection device and detection method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140122 |
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| CX01 | Expiry of patent term |