CN206945940U - A kind of hand-held TEV instrument for measuring partial discharge following test device - Google Patents
A kind of hand-held TEV instrument for measuring partial discharge following test device Download PDFInfo
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- CN206945940U CN206945940U CN201720889920.2U CN201720889920U CN206945940U CN 206945940 U CN206945940 U CN 206945940U CN 201720889920 U CN201720889920 U CN 201720889920U CN 206945940 U CN206945940 U CN 206945940U
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Abstract
The utility model discloses a kind of hand-held TEV instrument for measuring partial discharge following test device.The utility model includes microprocessor, the multivibrator comprising 555 timers, voltage amplifier circuit and charge-discharge circuit, wherein, multivibrator electrically connects with microprocessor；The output end of multivibrator electrically connects with the input of voltage amplifier circuit；The output end of voltage amplifier circuit electrically connects with the input of charge-discharge circuit；Charge-discharge circuit electrically connects with microprocessor.The utility model is simple in construction, simple and efficient to handle, is applicable to a variety of environment, and the TEV shelf depreciations test to switch cubicle has good booster action.
Description
Technical field
Electrical equipment testing equipment field is the utility model is related to, is detected more particularly, to a kind of electrical equipment equipment
Apparatus for correcting.
Background technology
The new high voltage electric equipment for designing and manufacturing, the weak ring in insulation can be found in time by measurement of partial discharge
Section, prevent design and the mistake in manufacturing process and the improper use of material.Shelf depreciation test is to differentiate product insulation or set
A kind of important method of standby operational reliability.It can find the equipment deficiency that pressure test can not be found.Shelf depreciation is tested
One of big event of current power equipment preventive trial.
TEV（Ground electric wave detection method）It is usually used in the shelf depreciation test of switch cubicle.When shelf depreciation occurs for switch cubicle, put
Electricity can be gathered in the adjacent metallic ground part of point of discharge, then form electromagnetism wave direction surrounding and propagate.TEV essence is detection
Electromagnetic wave caused by shelf depreciation, and then assess local discharging level.
But by working site is easily influenceed by electromagnetic interferences such as radio, lightings, test result accuracy is poor.
Therefore electric wave instrument for measuring partial discharge is usually only used as the instrument of generaI investigation in routine duties, is difficult to partial discharge quantity
Size is made to judge.Therefore, it is necessary to before using ground electric wave instrument for measuring partial discharge, the inspection of line sensitivity is entered to it, to result
It is modified.
Utility model content
The utility model overcomes the measurement defect of above-mentioned existing instrument for measuring partial discharge, there is provided a kind of new holds
Formula TEV instrument for measuring partial discharge following test device, following test can be done to TEV instrument for measuring partial discharge.This practicality is new
Type is simple in construction, simple and efficient to handle.
In order to solve the above technical problems, the technical solution of the utility model is as follows：
A kind of hand-held TEV instrument for measuring partial discharge following test device, including microprocessor, include 555 timers
Multivibrator, voltage amplifier circuit and charge-discharge circuit, wherein,
Described multivibrator electrically connects with described microprocessor；
The output end of described multivibrator electrically connects with the input of described voltage amplifier circuit；
The output end of described voltage amplifier circuit electrically connects with the input of described charge-discharge circuit；
Described charge-discharge circuit electrically connects with described microprocessor.
Utility model works process is as follows：
Multivibrator is formed by 555 timers and produces rectangular signal, and rectangular signal is risen by voltage amplifier circuit
Pressure, obtains boost signal.Boost signal is by charge-discharge circuit, the local discharge signal simulated.By by the part of simulation
Discharge signal contrasts with instrument for measuring partial discharge to the measured value of local discharge signal, so as to complete that shelf depreciation is surveyed
Try a following test of instrument.The local discharge signal of simulation feeds back to microprocessor, and microprocessor carries out sampling analysis.Square
Shape signal is also fed back into microprocessor, and microprocessor carries out frequency collection.Microprocessor combination sampling analysis and frequency collection
As a result, staff is fed back to.Staff is by the way that the local discharge signal of simulation is put with instrument for measuring partial discharge to local
The measured value of electric signal is contrasted, so as to complete a following test to instrument for measuring partial discharge.
In a kind of preferable scheme, described voltage amplifier circuit is scaling circuit or common-base amplification circuit.
In a kind of preferable scheme, described charge-discharge circuit include charging resistor, discharge resistance, relay, diode,
First electric capacity, the second electric capacity, first switch and second switch, wherein,
Input of the one end of described charging resistor as described charge-discharge circuit, the other end of described charging resistor
Electrically connected with the anode of described diode；
The negative electrode of described diode electrically connects with one end of described first switch；
The negative electrode of described diode electrically connects with one end of described second switch；
The negative electrode of described diode electrically connects with one end of described relay；
The other end of described first switch electrically connects with one end of the first described electric capacity；
The other end of described second switch electrically connects with one end of the second described electric capacity；
The other end of described relay electrically connects with one end of described discharge resistance；
The other end of the first described electric capacity electrically connects with the other end of the second described electric capacity；
The other end of the first described electric capacity electrically connects with the other end of described discharge resistance.
In charge-discharge circuit, by closure/disconnection of relay, promote electric capacity to carry out the operation of charged/discharged, form simulation
Local discharge signal.Diode is used to be protected from reverse charging.
In a kind of preferable scheme, described charge-discharge circuit also includes earth terminal, and described earth terminal is put with described
The other end electrical connection of resistance.
In a kind of preferable scheme, one end of described discharge resistance electrically connects with microprocessor.The office of discharge resistance
Portion's discharge signal feeds back to microprocessor.
In a kind of preferable scheme, the control terminal of described relay electrically connects with microprocessor.Relay passes through micro-
Processor adjusts the state of closure/disconnection.
In a kind of preferable scheme, the capacitance of the second described electric capacity is the N of the capacitance of the first described electric capacity
Times, N is the positive integer not less than 10.By selecting different electric capacity, it is easy in actual applications compare by different discharge and recharges
Influence of the TEV simulation local discharge signals that time is formed to TEV instrument for measuring partial discharge.
In a kind of preferable scheme, the resistance value of described charging resistor is more than the resistance value of described discharge resistance.
The resistance value of discharge resistance in charge-discharge circuit is less than the resistance value of charging resistor, causes charging rate to be slower than the velocity of discharge, can
During being approximately considered electric discharge charging action without.
In a kind of preferable scheme, described microprocessor is MSP430.MSP430 has the high and low power consumption of dominant frequency, low
The characteristics of cost.
In a kind of preferable scheme, described hand-held TEV instrument for measuring partial discharge following test device also includes
LCD display, described LCD display electrically connect with microprocessor.LCD display is used to show simulation local discharge signal
Frequency and waveform.
Compared with prior art, the beneficial effect of technical solutions of the utility model is：The utility model provides a kind of new
Hand-held TEV instrument for measuring partial discharge following test device, the sensitivity of instrument for measuring partial discharge can be checked.This
Utility model is simple in construction, simple and efficient to handle, is applicable to a variety of environment.Have very to local discharge test to electrical equipment
Good booster action.
Brief description of the drawings
Fig. 1 is the utility model structural circuit figure
Label declaration：1. charging resistor, 2. diodes, 3. first switches, 4. first electric capacity, 5. second switches, 6. second
Electric capacity, 7. discharge resistances, 8. earth terminals.
Embodiment
Accompanying drawing being given for example only property explanation, it is impossible to be interpreted as the limitation to this patent；
In order to more preferably illustrate the present embodiment, some parts of accompanying drawing have omission, zoomed in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be appreciated that some known features and its explanation, which may be omitted, in accompanying drawing
's.
The technical solution of the utility model is described further with reference to the accompanying drawings and examples.
As shown in figure 1, a kind of hand-held TEV instrument for measuring partial discharge following test device, the device include MSP430,
Multivibrator, scaling circuit, charge-discharge circuit and LCD display comprising 555 timers, wherein,
Multivibrator electrically connects with MSP430；
The output end of multivibrator electrically connects with the input of scaling circuit；
The output end of voltage amplifier circuit electrically connects with the input of charge-discharge circuit；
Charge-discharge circuit electrically connects with MSP430；
MSP430 electrically connects with LCD display.
Charge-discharge circuit includes charging resistor 1, discharge resistance 7, relay, diode 2, the first electric capacity 4, the second electric capacity 6, the
One switch 3, second switch 5 and earth terminal 8, wherein,
Input of the one end of charging resistor 1 as charge-discharge circuit, the other end of charging resistor 1 and the anode of diode 2
Electrical connection；
The negative electrode of diode 2 electrically connects with one end of first switch 3；
The negative electrode of diode 2 electrically connects with one end of second switch 5；
The negative electrode of diode 2 electrically connects with one end of relay；
The other end of first switch 3 electrically connects with one end of the first electric capacity 4；
The other end of second switch 5 electrically connects with one end of the second electric capacity 6；
The other end of relay electrically connects with one end of discharge resistance 7；
One end of discharge resistance 7 electrically connects with MSP430；
The other end of first electric capacity 4 electrically connects with the other end of the second electric capacity 6；
The other end of first electric capacity 4 electrically connects with the other end of discharge resistance 7；
Earth terminal 8 electrically connects with the other end of discharge resistance 7；
The capacitance of second electric capacity 6 is 10 times of integers of the capacitance of the first described electric capacity 4；
The resistance value of charging resistor 1 is more than the resistance value of discharge resistance 7.
The present embodiment course of work：
The multivibrator being made up of 555 timers produces rectangular signal, and voltage magnitude is 0 ~ 5V.Rectangular signal passes through ratio
Example computing circuit is boosted, and obtains the recurrent pulse that voltage magnitude is 0 ~ 12V.Periodic pulse signal by charge-discharge circuit,
In charge-discharge circuit, MSP430 realizes that the square wave of certain frequency is exported to relay by delay procedure so that relay is in
Closure/disconnection controllable state.When relay disconnects, signal source is filled by charging resistor to the first electric capacity 4 or the second electric capacity 6
Electricity.When relay closes, because the resistance value of the discharge resistance 7 in charge-discharge circuit is less than the resistance value of charging resistor 1, cause to fill
Electric speed is slower than the velocity of discharge, and charging action is without the first electric capacity 4 or the second electric capacity 6 only enter when can be approximately considered electric discharge
Row is to the discharge operation of discharge resistance 7, the local discharge signal of circulation formation simulation.In discharge process, charging circuit will be by
Diode 2 is protected from reverse charge.By by the local discharge signal of simulation and instrument for measuring partial discharge to local discharge signal
Measured value contrasted, so as to complete a following test to instrument for measuring partial discharge.The shelf depreciation letter of simulation
MSP430 number is fed back to, MSP430 carries out sampling analysis.Rectangular signal is also fed back into MSP430, and MSP430 carries out frequency collection.
MSP430 combinations sampling analysis and the result of frequency collection, feed back to staff by LCD display.Staff pass through by
The local discharge signal of simulation contrasts with instrument for measuring partial discharge to the measured value of local discharge signal, so as to complete pair
Following test of instrument for measuring partial discharge.Meanwhile by selecting the electric capacity of different capacitances, it is easy in actual applications
Compare influence of the TEV simulation local discharge signals formed by the different discharge and recharge time to TEV instrument for measuring partial discharge.
Same or analogous label corresponds to same or analogous part；
Term the being given for example only property explanation of position relationship described in accompanying drawing, it is impossible to be interpreted as the limitation to this patent；
Obviously, above-described embodiment of the present utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, in described above
On the basis of can also make other changes in different forms.There is no need and unable to give all embodiments
It is exhaustive.All made within spirit of the present utility model and principle all any modification, equivalent and improvement etc., should be included in
Within the protection domain of the utility model claims.
Claims (10)
1. a kind of hand-held TEV instrument for measuring partial discharge following test device, institute is it is characterised in that it includes microprocessor, bag
Multivibrator, voltage amplifier circuit and charge-discharge circuit containing 555 timers, wherein,
Described multivibrator electrically connects with described microprocessor；
The output end of described multivibrator electrically connects with the input of described voltage amplifier circuit；
The output end of described voltage amplifier circuit electrically connects with the input of described charge-discharge circuit；
Described charge-discharge circuit electrically connects with described microprocessor.
2. hand-held TEV instrument for measuring partial discharge following test device according to claim 1, it is characterised in that institute
The voltage amplifier circuit stated is scaling circuit or common-base amplification circuit.
3. hand-held TEV instrument for measuring partial discharge following test device according to claim 1 or 2, it is characterised in that
Described charge-discharge circuit includes charging resistor, discharge resistance, relay, diode, the first electric capacity, the second electric capacity, first switch
And second switch, wherein,
Input of the one end of described charging resistor as described charge-discharge circuit, the other end of described charging resistor and institute
The anode electrical connection for the diode stated；
The negative electrode of described diode electrically connects with one end of described first switch；
The negative electrode of described diode electrically connects with one end of described second switch；
The negative electrode of described diode electrically connects with one end of described relay；
The other end of described first switch electrically connects with one end of the first described electric capacity；
The other end of described second switch electrically connects with one end of the second described electric capacity；
The other end of described relay electrically connects with one end of described discharge resistance；
The other end of the first described electric capacity electrically connects with the other end of the second described electric capacity；
The other end of the first described electric capacity electrically connects with the other end of described discharge resistance.
4. hand-held TEV instrument for measuring partial discharge following test device according to claim 3, it is characterised in that institute
The charge-discharge circuit stated also includes earth terminal, and described earth terminal electrically connects with the other end of described discharge resistance.
5. hand-held TEV instrument for measuring partial discharge following test device according to claim 4, it is characterised in that institute
The one end for the discharge resistance stated electrically connects with microprocessor.
6. hand-held TEV instrument for measuring partial discharge following test device according to claim 5, it is characterised in that institute
The control terminal for the relay stated electrically connects with microprocessor.
7. hand-held TEV instrument for measuring partial discharge following test device according to claim 6, it is characterised in that institute
The capacitance for the second electric capacity stated is N times of the capacitance of the first described electric capacity, and N is the positive integer not less than 10.
8. hand-held TEV instrument for measuring partial discharge following test device according to claim 7, it is characterised in that institute
The resistance value for the charging resistor stated is more than the resistance value of discharge resistance.
9. the hand-held TEV instrument for measuring partial discharge following test device according to claim 1,2,4,5,6,7 or 8,
Characterized in that, described microprocessor is MSP430.
10. the hand-held TEV instrument for measuring partial discharge following test device according to claim 1,2,4,5,6,7 or 8,
Characterized in that, described hand-held TEV instrument for measuring partial discharge following test device also includes LCD display, it is described
LCD display electrically connects with microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720889920.2U CN206945940U (en) | 2017-07-21 | 2017-07-21 | A kind of hand-held TEV instrument for measuring partial discharge following test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720889920.2U CN206945940U (en) | 2017-07-21 | 2017-07-21 | A kind of hand-held TEV instrument for measuring partial discharge following test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206945940U true CN206945940U (en) | 2018-01-30 |
Family
ID=61371275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720889920.2U Active CN206945940U (en) | 2017-07-21 | 2017-07-21 | A kind of hand-held TEV instrument for measuring partial discharge following test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206945940U (en) |
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2017
- 2017-07-21 CN CN201720889920.2U patent/CN206945940U/en active Active
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