CN206892306U - A kind of hand-held UHF instrument for measuring partial discharge following test device - Google Patents
A kind of hand-held UHF instrument for measuring partial discharge following test device Download PDFInfo
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- CN206892306U CN206892306U CN201720756793.9U CN201720756793U CN206892306U CN 206892306 U CN206892306 U CN 206892306U CN 201720756793 U CN201720756793 U CN 201720756793U CN 206892306 U CN206892306 U CN 206892306U
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Abstract
The utility model overcomes the quantization defect of existing instrument for measuring partial discharge, there is provided a kind of new hand-held UHF instrument for measuring partial discharge following test device.The utility model includes microprocessor, variable voltage source and transmission circuit.The utility model is simple in construction, simple and efficient to handle, is applicable to a variety of environment, has good booster action to local discharge test to electrical equipment.
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.
In shelf depreciation test, the shelf depreciation collected is high-frequency signal.Shelf depreciation is tested typically with voltage
Or the form of electricity represents.Which kind of but no matter represented with unit, the front end acquisition module of instrument for measuring partial discharge is all
Voltage has been converted the signal into, the signal transacting of tester could be facilitated.But because instrument for measuring partial discharge is to shelf depreciation
Measurement quantization error be present, sensitivity declines, and influences the effect of shelf depreciation test.Therefore, it is necessary to local discharge test
The sensitivity of instrument is checked.
Utility model content
The utility model overcomes the quantization defect of above-mentioned existing instrument for measuring partial discharge, there is provided a kind of new holds
Formula UHF instrument for measuring partial discharge following test device, can do following test to instrument for measuring partial discharge.The utility model knot
Structure is simple, simple and efficient to handle, is applicable to a variety of environment.
In order to solve the above technical problems, the technical solution of the utility model is as follows：
A kind of hand-held UHF instrument for measuring partial discharge following test device, including microprocessor, voltage source and transmission electricity
Road, its annexation are as follows：
Microprocessor electrically connects with transmission circuit；
Voltage source electrically connects with transmission circuit；
Variable voltage source include operation amplifier electrical equipment, the first PMOS, the second PMOS, 3rd resistor, the 4th resistance and
5th resistance and load, its annexation are as follows：
3rd resistor has a first end and the second end, and the 4th resistance has a first end and the second end, the 5th resistance have first end and
Second end, it is loaded with first end and the second end；
The inverting input of operation amplifier electrical equipment electrically connects with the first end of the 5th resistance；
The first end of 5th resistance electrically connects with the second end of the 4th resistance；
The first end of 4th resistance electrically connects with the first end loaded；
The first end of 4th resistance electrically connects with the second end of 3rd resistor；
The first end of 4th resistance electrically connects with the source electrode of the second PMOS；
The first end of 3rd resistor electrically connects with the grid of the second PMOS；
The first end of 3rd resistor electrically connects with the source electrode of the first PMOS；
The grid of first PMOS electrically connects with the output end of operation amplifier electrical equipment；
The drain electrode of first PMOS electrically connects with the drain electrode of the second PMOS.
Utility model works process is as follows：
Microprocessor realizes that the square wave of certain frequency is exported to transmission circuit by delay procedure, and letter is examined so as to realize
Number synchronizing cycle is adjustable.The output voltage of variable voltage source forms local discharge signal after transmission circuit, local by inciting somebody to action
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.
In a kind of preferable scheme, microprocessor is single-chip microcomputer.
In a kind of preferable scheme, single-chip microcomputer is MSP430.MSP430 has the high and low power consumption of dominant frequency, the spy of low cost
Point.
In a kind of preferable scheme, voltage source is variable voltage source, and variable voltage source has first end and the second end.It is adjustable
Voltage source adjustable extent is 0~100V, so can be to check the sensitivity of instrument for measuring partial discharge by adjusting voltage.Together
When for the generation of local discharge signal, the electric current that variable voltage source must keep enough exports, just so can guarantee that transmission electricity
The quick charge on road, so as to increase the rising steepness of simulation local discharge signal.Therefore the electric current that variable voltage source provides is not small
In 1A.
In a kind of preferable scheme, transmission circuit includes first resistor, second resistance, the first relay, the second relay
Device and electric capacity, its annexation are as follows：
First resistor has first end and the second end, and second resistance has first end and the second end, and the first relay includes first
End, the second end and control terminal, the second relay have first end, the second end and control terminal, and electric capacity has first end and the second end；
The first end of variable voltage source electrically connects with the first end of first resistor；
Second end of first resistor electrically connects with the first end of the first relay；
Second end of the first relay electrically connects with the first end of electric capacity；
The control terminal of first relay electrically connects with MSP430；
First end of the first end of electric capacity also with the second relay electrically connects；
Second end of the second relay electrically connects with the first end of second resistance；
The control terminal of second relay electrically connects with MSP430；
Second end of second resistance electrically connects with the second end of electric capacity；
Second end of electric capacity also electrically connects with the second end of variable voltage source.
In a kind of preferable scheme, electric capacity is ceramic disc capacitor.Ceramic disc capacitor possesses ESR (etc. lower than electrochemical capacitor
Imitate series resistance).
In a kind of preferable scheme, the first relay adjusts the state of closure/disconnection by MSP430.
In a kind of preferable scheme, the second relay adjusts the state of closure/disconnection by MSP430.
The utility model principle is as follows：
Variable voltage source realizes the adjustable of output voltage values by the 5th resistance of adjustment and the ratio of the 6th resistance.Meanwhile
Because the 6th resistance is used as feedback resistance so that adjustable voltage source circuit has the function of negative-feedback, by noise jamming and dashes forward
It is deformed into negative-feedback, the output valve of steady voltage source.
Input impedance of the second resistance as instrument for measuring partial discharge, electric capacity are used for storing electricity, and variable voltage source provides
Voltage U, the first relay is as normal closing relay, and the second relay is as normal off open relay.Therefore electricity can be calculated
It is Q=U*C to hold stored electricity (C is the capacity of electric capacity).Electric capacity will be put by second resistance after the first relay closes
Electricity.Therefore electric capacity works as repid discharge, could approx be used as local discharge signal.And when electric capacity discharges, the first relay is normal
Close and will be switched off, stop charging.
The interval of discharge and recharge is determined by single-chip microcomputer by the relay of Control first and the second relay.Adjustable electric
The output voltage of potential source forms local discharge signal after the discharge and recharge of transmission circuit, by by local discharge signal and part
Discharge tester contrasts to the measured value of local discharge signal, so as to complete to the once sensitive of instrument for measuring partial discharge
Degree checks.
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 UHF 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.
Fig. 2 is variable voltage source circuit diagram.
Label declaration：1. first resistor, 2. first relays, 3. electric capacity, 4. second relays, 5. second resistances, 6. fortune
Calculate amplifier, 7. 3rd resistors, 8. the 4th resistance, 9. the 5th resistance, 10. first PMOSs, 11. second PMOSs, 12. negative
Carry.
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 UHF instrument for measuring partial discharge following test device, including MSP430, controllable electric
Potential source and transmission circuit, MSP430 electrically connect with transmission circuit, and controllable voltage source electrically connects with transmission circuit.
Transmission circuit includes first resistor 1, second resistance 5, the first relay 2, the second relay 4 and ceramic disc capacitor, its
Annexation is as follows：
First resistor 1 has a first end and the second end, and second resistance 5 has a first end and the second end, and the first relay 2 includes the
One end, the second end and control terminal, the second relay 4 have first end, the second end and control terminal, ceramic disc capacitor to have first end and second
End；
The first end of variable voltage source electrically connects with the first end of first resistor 1；
Second end of first resistor 1 electrically connects with the first end of the first relay 2；
Second end of the first relay 2 electrically connects with the first end of ceramic disc capacitor；
The control terminal of first relay 2 electrically connects with MSP430；
First end of the first end of ceramic disc capacitor also with the second relay 4 electrically connects；
Second end of the second relay 4 electrically connects with the first end of second resistance 5；
The control terminal of second relay 4 electrically connects with MSP430；
Second end of second resistance 5 electrically connects with the second end of ceramic disc capacitor；
Second end of ceramic disc capacitor also electrically connects with the second end of variable voltage source.
First relay 2 adjusts the state of cut-off/close by MSP430.
Second relay 4 adjusts the state of cut-off/close by MSP430.
Variable voltage source includes operation amplifier electrical equipment 6, the first PMOS 10, the second PMOS 11,3rd resistor the 7, the 4th
Resistance 8, the 5th resistance 9 and load 12, its annexation is as follows：
3rd resistor 7 has first end and the second end, and the 4th resistance 8 has first end and the second end, and the 5th resistance 9 has first end
With the second end, load 12 has first end and the second end；
The inverting input of operation amplifier electrical equipment 6 electrically connects with the first end of the 5th resistance 9；
The in-phase input end of operation amplifier electrical equipment 6 electrically connects with reference voltage Vref；
The first end of 5th resistance 9 electrically connects with the second end of the 4th resistance 8；
The first end of 4th resistance 8 electrically connects with the first end of load 12；
The first end of 4th resistance 8 electrically connects with the second end of 3rd resistor 7；
The first end of 4th resistance 8 electrically connects with the source electrode of the second PMOS 11；
The first end of 3rd resistor 7 electrically connects with the grid of the second PMOS 11；
The first end of 3rd resistor 7 electrically connects with the source electrode of the first PMOS 10；
The grid of first PMOS 10 electrically connects with the output end of operation amplifier electrical equipment 6；
The drain electrode of first PMOS 10 electrically connects with the drain electrode of the second PMOS 11；
Output Vo of the source electrode of second PMOS 11 as variable voltage source.
The present embodiment course of work is as follows：
Variable voltage source realizes the adjustable of output voltage values, i.e. Vo by the 5th resistance of adjustment and the ratio of the 6th resistance
=Vref* (R4+R5)/R4.Meanwhile the effect based on PMOS Yu the 6th resistance (feedback resistance) so that variable voltage source electricity
Road has the function of negative-feedback.When noise jamming and mutate now, stable shape is progressively reached by negative-feedback magnitude of voltage
State, circuit are in balance, and voltage output value keeps stable..
The discharge and recharge time of MSP430 controlling transmission circuits.Variable voltage source is local by the charge and discharge electric forming of transmission circuit
Discharge signal.Local discharge signal is transferred to instrument for measuring partial discharge, by the way that local discharge signal and shelf depreciation are tested
Instrument contrasts to the measured value of local discharge signal, so as to complete a following test to instrument for measuring partial discharge.
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 (7)
1. a kind of hand-held UHF instrument for measuring partial discharge following test device, it is characterised in that including microprocessor, adjustable
Voltage source, transmission circuit, its annexation are as follows：
Described microprocessor electrically connects with transmission circuit；
Described variable voltage source electrically connects with transmission circuit；
The variable voltage source include operation amplifier electrical equipment, the first PMOS, the second PMOS, 3rd resistor, the 4th resistance and
5th resistance and load, its annexation are as follows：
3rd resistor has first end and the second end, and the 4th resistance has first end and the second end, and the 5th resistance has first end and second
End, is loaded with first end and the second end；
The inverting input of described operation amplifier electrical equipment electrically connects with the first end of the 5th described resistance；
The first end of the 5th described resistance electrically connects with the second end of the 4th described resistance；
The first end of the 4th described resistance electrically connects with the first end of described load；
The described first end of the 4th resistance electrically connects with the second end of described 3rd resistor；
The first end of the 4th described resistance electrically connects with the source electrode of the second described PMOS；
The first end of described 3rd resistor electrically connects with the grid of the second described PMOS；
The first end of described 3rd resistor electrically connects with the source electrode of the first described PMOS；
The grid of the first described PMOS electrically connects with the output end of described operation amplifier electrical equipment；
The drain electrode of the first described PMOS electrically connects with the drain electrode of the second described PMOS.
2. hand-held UHF instrument for measuring partial discharge following test device according to claim 1, it is characterised in that institute
The microprocessor stated is single-chip microcomputer.
3. hand-held UHF instrument for measuring partial discharge following test device according to claim 2, it is characterised in that institute
The single-chip microcomputer stated is MSP430.
4. hand-held UHF instrument for measuring partial discharge following test device according to claim 3, it is characterised in that institute
The transmission circuit stated includes first resistor, second resistance, the first relay, the second relay and electric capacity, and its annexation is as follows：
Described first resistor has a first end and the second end, and described second resistance has a first end and the second end, and described first
Relay includes first end, the second end and control terminal, and the second described relay has first end, the second end and control terminal, described
Electric capacity have first end and the second end；
The first end of described variable voltage source electrically connects with the first end of described first resistor；
Second end of described first resistor electrically connects with the first end of the first described relay；
Second end of the first described relay electrically connects with the first end of described electric capacity；
The control terminal of the first described relay electrically connects with described MSP430；
First end of the first end of described electric capacity also with the second described relay electrically connects；
Second end of the second described relay electrically connects with the first end of described second resistance；
The control terminal of the second described relay electrically connects with described MSP430；
Second end of described second resistance electrically connects with the second end of described electric capacity；
Second end of described electric capacity also electrically connects with the second end of described variable voltage source.
5. hand-held UHF instrument for measuring partial discharge following test device according to claim 4, it is characterised in that institute
The electric capacity stated is ceramic disc capacitor.
6. hand-held UHF instrument for measuring partial discharge following test device according to claim 5, it is characterised in that institute
The first relay stated adjusts the state of closure/disconnection by MSP430.
7. hand-held UHF instrument for measuring partial discharge following test device according to claim 6, it is characterised in that institute
The second relay stated adjusts the state of cut-off/close by MSP430.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720756793.9U CN206892306U (en) | 2017-06-27 | 2017-06-27 | A kind of hand-held UHF instrument for measuring partial discharge following test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720756793.9U CN206892306U (en) | 2017-06-27 | 2017-06-27 | A kind of hand-held UHF instrument for measuring partial discharge following test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206892306U true CN206892306U (en) | 2018-01-16 |
Family
ID=61316947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720756793.9U Active CN206892306U (en) | 2017-06-27 | 2017-06-27 | A kind of hand-held UHF instrument for measuring partial discharge following test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206892306U (en) |
-
2017
- 2017-06-27 CN CN201720756793.9U patent/CN206892306U/en active Active
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