CN208297652U - A kind of testing device for current leakage - Google Patents
A kind of testing device for current leakage Download PDFInfo
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- CN208297652U CN208297652U CN201821045646.1U CN201821045646U CN208297652U CN 208297652 U CN208297652 U CN 208297652U CN 201821045646 U CN201821045646 U CN 201821045646U CN 208297652 U CN208297652 U CN 208297652U
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Abstract
The utility model discloses a kind of testing device for current leakage, it is mounted on the earth current end of the iron core of transformer, including bleeder circuit, scaling circuit, low-pass filter circuit, analog-to-digital conversion module and micro-chip processor, the earth current end of the iron core of the input terminal and transformer of bleeder circuit is electrically connected；Bleeder circuit provides input voltage drop for scaling circuit；The output end of scaling circuit is electrically connected with the input terminal of low-pass filter circuit；The output end of low-pass filter circuit is electrically connected with the input terminal of analog-to-digital conversion module；The output end of analog-to-digital conversion module is electrically connected with the input terminal of micro-chip processor.The utility model effectively realizes the detection and protection to main transformer by carrying out sampling analysis to the earth current of main transformer using bleeder circuit and scaling circuit；And since operational amplifier, analog-to-digital conversion module, micro-chip processor are all using unified power supply, relevant transforming circuit is eliminated, the structure of device is simpler, and volume is smaller.
Description
Technical field
The utility model relates to transformer detection fields, more particularly, to a kind of testing device for current leakage.
Background technique
Main transformer is one of most important power equipment, is directly related to the normal conversion and transmission of electric energy, main transformer
Depressor is mainly made of iron core and winding etc..And main transformer common one of failure when iron core failure.Multipoint earthing of iron core makes iron core
Closed circuit is formed between earth mat and generates circulation, causes iron core partly or wholly to overheat, iron core locally or globally overheats meeting
Accelerate insulating materials aging and insulation oil decomposition, declines so as to cause iron core integral insulation performance and mechanical performance, influence transformation
The safe and stable operation of device.The more serious ground connection band iron fusing that may make main transformer burns out iron core, causes iron core current potential outstanding
It is floating, it generates electric discharge phenomena and damages transformer.The most direct phenomenon of multipoint earthing of iron core is exactly that iron core grounding current becomes larger.
Utility model content
The utility model overcomes the defect of existing main transformer detection, provides a kind of new leakage current testing dress
It sets.The utility model by carrying out sampling analysis using the earth current of bleeder circuit and scaling circuit to main transformer,
Effectively realize the detection and protection to main transformer.
In order to solve the above technical problems, the technical solution of the utility model is as follows:
A kind of testing device for current leakage is mounted on the earth current end of the iron core of transformer, including bleeder circuit, ratio
Computing circuit, low-pass filter circuit, analog-to-digital conversion module and micro-chip processor, wherein
The earth current end of the iron core of the input terminal and transformer of the bleeder circuit is electrically connected；
The bleeder circuit provides input voltage drop for scaling circuit；
The output end of the scaling circuit is electrically connected with the input terminal of low-pass filter circuit；
The output end of the low-pass filter circuit is electrically connected with the input terminal of analog-to-digital conversion module；
The output end of the analog-to-digital conversion module is electrically connected with the input terminal of micro-chip processor.
Utility model works process is as follows:
It is divided by earth current of the bleeder circuit to the iron core of transformer, is then carried out by scaling circuit
Further partial pressure, is filtered using low-pass filter circuit.Last obtained filtering signal is transmitted to micro-chip processor.
Micro-chip processor carries out linear transformation according to filtering signal, obtains the numerical value of the earth current of the iron core about transformer, and right
The iron core of transformer is judged.
In a preferred solution, the bleeder circuit includes first resistor and second resistance, the ratio fortune
Calculating circuit includes operational amplifier, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, wherein
The one of input terminal of the one end of the first resistor as bleeder circuit, one end of first resistor and 3rd resistor
End electrical connection；
The other end of the first resistor is electrically connected with one end of second resistance；
The other end of the second resistance is grounded；
The other end of the 3rd resistor is electrically connected with the non-inverting input terminal of operational amplifier；
The other end of the first resistor is electrically connected with one end of the 4th resistance；
The other end of 4th resistance is electrically connected with the inverting input terminal of operational amplifier；
The other end of the 3rd resistor is electrically connected with one end of the 5th resistance；
The other end of 5th resistance is grounded；
The other end of 4th resistance is electrically connected with one end of the 6th resistance；
The other end of 6th resistance is electrically connected with the output end of operational amplifier, and the output end of operational amplifier is made
For the output end of scaling circuit.
In a preferred solution, the resistance value of the 3rd resistor is equal to the resistance value of the 5th resistance.
In this preferred embodiment, the resistance value of 3rd resistor is equal to the resistance value of the 5th resistance, so that output voltage is directly etc.
It is dropped in the both end voltage of first resistor.
In a preferred solution, the operational amplifier is ADA4096.
In this preferred embodiment, ADA4096 is rail-to-rail amplifier, has input over-voltage protecting function, for being higher or lower than
Range within 32 V of voltage of power rail, will not occur reverse phase or latch.When collection terminal generation is breaking suddenly or other are asked
When topic causes collection voltages excessive, overvoltage protection can be carried out to test device.
In a preferred solution, the low-pass filter circuit includes the first tunable capacitor, the second tunable capacitor, the
Three tunable capacitors, inductance, wherein
Input terminal of the one end of the inductance as low-pass filter circuit, the other end of inductance is as low-pass filter circuit
Output end；
One end of the inductance is electrically connected with one end of the first tunable capacitor；
The other end of first tunable capacitor is grounded；
One end of the inductance is electrically connected with one end of the second tunable capacitor；
The other end of the inductance is electrically connected with the other end of the second tunable capacitor；
The other end of the inductance is electrically connected with one end of third tunable capacitor；
The other end of the third tunable capacitor is grounded.
In a preferred solution, the testing device for current leakage further includes that the first zener diode and second are steady
Press diode, wherein
The anode of first zener diode is electrically connected with the output end of low-pass filter circuit；
The cathode of first zener diode connects power supply；
The cathode of second zener diode is electrically connected with the output end of low-pass filter circuit；
The plus earth of second zener diode.
In this preferred embodiment, the first zener diode and the second zener diode provide the effect of pressure stabilizing.
In a preferred solution, the testing device for current leakage further includes data storage, the data
The input terminal of memory is electrically connected with the output end of micro-chip processor.
In this preferred embodiment, data storage is used to store the numerical value of the earth current of the iron core of transformer.
In a preferred solution, the analog-to-digital conversion module is AD7920.
In a preferred solution, operational amplifier, analog-to-digital conversion module, micro-chip processor all use identical electricity
Source.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
The utility model is by sampling the earth current of main transformer using bleeder circuit and scaling circuit
Analysis, effectively realizes the detection and protection to main transformer；And due to operational amplifier, analog-to-digital conversion module, micro process
Chip all using unified power supply, eliminates relevant transforming circuit, the structure of device is simpler, and volume is smaller.
Detailed description of the invention
Fig. 1 is the module map of embodiment.
Fig. 2 is the low-pass filter circuit figure of embodiment.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached 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 testing device for current leakage, is mounted on the earth current end of the iron core of transformer, including divide
Volt circuit, scaling circuit, low-pass filter circuit, AD7920, the first zener diode, the second zener diode,
MSP430F149 and TF card, wherein
The earth current end of the iron core of the input terminal and transformer of bleeder circuit is electrically connected；
Bleeder circuit provides input voltage drop for scaling circuit；
The output end of scaling circuit is electrically connected with the input terminal of low-pass filter circuit；
The output end of low-pass filter circuit is electrically connected with the input terminal of AD7920；
The anode of first zener diode is electrically connected with the output end of low-pass filter circuit；
The cathode of first zener diode connects 5V power supply；
The cathode of second zener diode is electrically connected with the output end of low-pass filter circuit；
The plus earth of second zener diode；
The output end of AD7920 is electrically connected with the input terminal of MSP430F149,
The output end of MSP430F149 is electrically connected with the input terminal of TF card.
Wherein, bleeder circuit includes first resistor and second resistance, scaling circuit include ADA4096,3rd resistor,
4th resistance, the 5th resistance and the 6th resistance, wherein
Input terminal of the one end of first resistor as bleeder circuit, one end of first resistor and one end of 3rd resistor are electrically connected
It connects；
The other end of first resistor is electrically connected with one end of second resistance；
The other end of second resistance is grounded；
The other end of 3rd resistor is electrically connected with the non-inverting input terminal of ADA4096；
The other end of first resistor is electrically connected with one end of the 4th resistance；
The other end of 4th resistance is electrically connected with the inverting input terminal of ADA4096；
The other end of 3rd resistor is electrically connected with one end of the 5th resistance；
The other end of 5th resistance is grounded；
The other end of 4th resistance is electrically connected with one end of the 6th resistance；
The other end of 6th resistance is electrically connected with the output end of ADA4096, and the output end of ADA4096 is as scale operation electricity
The output end on road；
The resistance value of 3rd resistor is equal to the resistance value of the 5th resistance.
Wherein, as shown in Fig. 2, low-pass filter circuit includes the first tunable capacitor, the second tunable capacitor, third adjustable electric
Hold, inductance, wherein
Input terminal of the one end of inductance as low-pass filter circuit, output of the other end of inductance as low-pass filter circuit
End；
One end of inductance is electrically connected with one end of the first tunable capacitor；
The other end of first tunable capacitor is grounded；
One end of inductance is electrically connected with one end of the second tunable capacitor；
The other end of inductance is electrically connected with the other end of the second tunable capacitor；
The other end of inductance is electrically connected with one end of third tunable capacitor；
The other end of third tunable capacitor is grounded.
The present embodiment course of work:
It is divided by earth current of the bleeder circuit to the iron core of transformer, is then carried out by scaling circuit
Further partial pressure, is filtered using low-pass filter circuit.Last obtained filtering signal is by two pole of a pair of of pressure stabilizing
MSP430F149 is transmitted to after pipe.MSP430F149 carries out linear transformation according to filtering signal, obtains the iron core about transformer
Earth current numerical value, and the iron core of transformer is judged.
The same or similar label correspond to the same or similar components；
The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
Exhaustion.Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in
Within the protection scope of the utility model claims.
Claims (8)
1. a kind of testing device for current leakage is mounted on the earth current end of the iron core of transformer, which is characterized in that including partial pressure
Circuit, scaling circuit, low-pass filter circuit, analog-to-digital conversion module and micro-chip processor, wherein
The earth current end of the iron core of the input terminal and transformer of the bleeder circuit is electrically connected；
The bleeder circuit provides input voltage drop for scaling circuit；
The output end of the scaling circuit is electrically connected with the input terminal of low-pass filter circuit；
The output end of the low-pass filter circuit is electrically connected with the input terminal of analog-to-digital conversion module；
The output end of the analog-to-digital conversion module is electrically connected with the input terminal of micro-chip processor.
2. testing device for current leakage according to claim 1, which is characterized in that the bleeder circuit includes the first electricity
Resistance and second resistance, the scaling circuit include operational amplifier, 3rd resistor, the 4th resistance, the 5th resistance and the
Six resistance, wherein
Input terminal of the one end of the first resistor as bleeder circuit, one end of first resistor and one end electricity of 3rd resistor
Connection；
The other end of the first resistor is electrically connected with one end of second resistance；
The other end of the second resistance is grounded；
The other end of the 3rd resistor is electrically connected with the non-inverting input terminal of operational amplifier；
The other end of the first resistor is electrically connected with one end of the 4th resistance；
The other end of 4th resistance is electrically connected with the inverting input terminal of operational amplifier；
The other end of the 3rd resistor is electrically connected with one end of the 5th resistance；
The other end of 5th resistance is grounded；
The other end of 4th resistance is electrically connected with one end of the 6th resistance；
The other end of 6th resistance is electrically connected with the output end of operational amplifier, the output end of operational amplifier be used as than
The output end of example computing circuit.
3. testing device for current leakage according to claim 2, which is characterized in that the resistance value etc. of the 3rd resistor
In the resistance value of the 5th resistance.
4. testing device for current leakage according to claim 3, which is characterized in that the operational amplifier is
ADA4096。
5. according to claim 1 to testing device for current leakage described in any claim in 4, which is characterized in that described
Low-pass filter circuit includes the first tunable capacitor, the second tunable capacitor, third tunable capacitor, inductance, wherein
Input terminal of the one end of the inductance as low-pass filter circuit, the other end of inductance is as the defeated of low-pass filter circuit
Outlet；
One end of the inductance is electrically connected with one end of the first tunable capacitor；
The other end of first tunable capacitor is grounded；
One end of the inductance is electrically connected with one end of the second tunable capacitor；
The other end of the inductance is electrically connected with the other end of the second tunable capacitor；
The other end of the inductance is electrically connected with one end of third tunable capacitor；
The other end of the third tunable capacitor is grounded.
6. testing device for current leakage according to claim 5, which is characterized in that the testing device for current leakage is also
Including the first zener diode and the second zener diode, wherein
The anode of first zener diode is electrically connected with the output end of low-pass filter circuit；
The cathode of first zener diode connects power supply；
The cathode of second zener diode is electrically connected with the output end of low-pass filter circuit；
The plus earth of second zener diode.
7. according to claim 1, testing device for current leakage described in 2,3,4 or 6, which is characterized in that the leakage current
Test device further includes data storage, and the input terminal of the data storage is electrically connected with the output end of micro-chip processor.
8. testing device for current leakage according to claim 7, which is characterized in that the analog-to-digital conversion module is
AD7920。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821045646.1U CN208297652U (en) | 2018-07-03 | 2018-07-03 | A kind of testing device for current leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821045646.1U CN208297652U (en) | 2018-07-03 | 2018-07-03 | A kind of testing device for current leakage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208297652U true CN208297652U (en) | 2018-12-28 |
Family
ID=64700153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821045646.1U Active CN208297652U (en) | 2018-07-03 | 2018-07-03 | A kind of testing device for current leakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208297652U (en) |
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2018
- 2018-07-03 CN CN201821045646.1U patent/CN208297652U/en active Active
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