CN205751741U - A kind of Multifunction transformer degaussing gear - Google Patents
A kind of Multifunction transformer degaussing gear Download PDFInfo
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- CN205751741U CN205751741U CN201620414238.3U CN201620414238U CN205751741U CN 205751741 U CN205751741 U CN 205751741U CN 201620414238 U CN201620414238 U CN 201620414238U CN 205751741 U CN205751741 U CN 205751741U
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- 238000005070 sampling Methods 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 230000005389 magnetism Effects 0.000 claims description 13
- 238000004458 analytical method Methods 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims 1
- 230000005347 demagnetization Effects 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 8
- 238000004804 winding Methods 0.000 description 13
- 230000005611 electricity Effects 0.000 description 8
- 230000002459 sustained effect Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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Abstract
A kind of Multifunction transformer degaussing gear, including two DC output terminal, current detection circuit, voltage detecting circuit, fly-wheel diode and DC numerical control constant-current source, power supply relay and the throw over relay controlled by CPU, the negative pole of described DC numerical control constant-current source is connected with a DC output terminal through the pair of contact of throw over relay, and positive pole another pair of contact through power supply relay, current sampling resistor and throw over relay successively is connected with another DC output terminal；The negative electrode of described fly-wheel diode connects the negative pole of constant-current source, anode is connected between current sampling resistor and power supply relay, the output signal of described current sampling resistor connects the input port of CPU by current detection circuit, and the voltage between two DC output terminal connects the input port of CPU by voltage detecting circuit.This utility model is multiple functional, not only can improve test and the demagnetization efficiency of transformator, and can guarantee that the erasure effect of transformator, eliminates power grid accident hidden danger.
Description
Technical field
This utility model relate to a kind of have concurrently direct resistance metering, direct current Analysis ofremanence, exchange Analysis ofremanence function transformator
Degaussing gear, belongs to transformer technology field.
Background technology
Power transformer is the visual plant of composition electrical network, and the safe operation to electrical network has extremely important effect.?
It is required for during transformator commissioning test and repair based on condition of component routine test it is carried out D.C. resistance test, and D.C. resistance is surveyed
The operations such as examination can make to remain in transformer core remanent magnetism, and after causing transformator to put into operation, vibrations aggravation, affects transformer device structure
In the service life of part, shorten the overhaul life of transformator.Additionally, iron core remanent magnetism also can make iron core occur that half cycle is saturated, in excitation
Electric current produces a large amount of even-order harmonic, and zero-sequence current also can increase several times, this not only adds the reactive loss of transformator,
It is also possible to cause the protection device action of transformator, causes and close a floodgate unsuccessfully, time serious, even can cause neighbouring properly functioning change
Depressor trips, and threatens the operation safety of electrical network.For these reasons, the large-scale power transformer after test or before putting into operation is carried out
Demagnetization is the most necessary.
At present, it is all to use different instruments with demagnetization that transformator carries out direct resistance metering, operates comparatively laborious, work effect
Rate is low, and existing Deperming Facility function singleness, the remanent magnetism of transformator can not be detected after completing by demagnetization, staff
Erasure effect cannot be known, erroneous judgement once occurs, threaten to the safety of electrical network.Additionally, some transformator itself
Remanent magnetism is the least, if using Deperming Facility to carry out demagnetization, also can increase the remanent magnetism of transformator.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of Multifunction transformer degaussing gear,
To improve test and the demagnetization efficiency of power transformer, it is ensured that the erasure effect of transformator.
Problem described in the utility model is realized by techniques below scheme:
A kind of Multifunction transformer degaussing gear, composition includes two DC output terminal, current detection circuit, voltages
Testing circuit, fly-wheel diode and DC numerical control constant-current source, power supply relay and the throw over relay controlled by CPU, described
The negative pole of DC numerical control constant-current source is connected with a DC output terminal through the pair of contact of throw over relay, and positive pole is successively through electricity
The another pair of contact of source relay, current sampling resistor and throw over relay is connected with another DC output terminal；Described afterflow
The negative electrode of diode connects the negative pole of constant-current source, and anode is connected between current sampling resistor and power supply relay, described current sample
The output signal of resistance connects the input port of CPU by current detection circuit, and the voltage between two DC output terminal passes through
Voltage detecting circuit connects the input port of CPU.
Above-mentioned Multifunction transformer degaussing gear, also includes in composition exchanging Analysis ofremanence unit, and described exchange remanent magnetism divides
Analysis unit includes electric voltage regulator, isolation boosting transformator, alternating voltage testing current module and two AC output terminal, institute
Stating the input termination alternating voltage of electric voltage regulator, outfan is connected by isolation boosting transformator and two AC output terminal
Connect, the output port controlling termination CPU of electric voltage regulator；The input of described alternating voltage testing current module is connected to isolation
The outfan of booster transformer, the input port of output termination CPU.
Above-mentioned Multifunction transformer degaussing gear, described current detection circuit includes the first programming amplifying and AD conversion mould
The output signal of the input termination current sampling resistor of block, described first programming amplifying and AD conversion module, outfan is through first
Photoisolator connects the input port of CPU.
Above-mentioned Multifunction transformer degaussing gear, described voltage detecting circuit includes the second programming amplifying and AD conversion mould
Two inputs of block, the second photoisolator and voltage sample relay, described second programming amplifying and AD conversion module lead to
Overvoltage sampling relay connects two DC output terminal respectively, and outfan connects the input port of CPU through the second photoisolator.
Above-mentioned Multifunction transformer degaussing gear, described fly-wheel diode can be substituted by inverse electromotive force protection module.
Above-mentioned Multifunction transformer degaussing gear, described alternating voltage testing current module uses electric energy meter chip
CS5460。
This utility model is possible not only to carry out transformator demagnetization, but also has direct resistance metering and Analysis ofremanence function,
Realize a tractor serves several purposes, be possible not only to simplify operation, improve test and the demagnetization efficiency of power transformer, and can be prevented effectively from
Erroneous judgement, it is ensured that the erasure effect of transformator, eliminates power grid accident hidden danger.
Accompanying drawing explanation
Fig. 1 is electrical schematic diagram of the present utility model.
Figure is respectively numbered: CPU, microprocessor, U1, the first programming amplifying and AD conversion module, U2, the second programming amplifying
And AD conversion module, U3, alternating voltage testing current module, G1, the first photoisolator, G2, the second photoisolator, TY,
Electric voltage regulator, T, isolation boosting transformator, Is, constant-current source, D, fly-wheel diode, R, current sampling resistor, J1, power supply relay
Device, J2, voltage sample relay, J3, throw over relay, A1, A2, DC output terminal, B1, B2, AC output terminal.
Detailed description of the invention
The utility model is described in further detail below in conjunction with the accompanying drawings.
This utility model provides a kind of multiple functional transformator degaussing gear, and this device can test Transformer Winding
D.C. resistance, moreover it is possible to detection transformator whether have remanent magnetism, demagnetization can be determined the need for according to detection case, if remanent magnetism is very
Little or there is no remanent magnetism, just no longer carry out demagnetization.Demagnetization detects erasure effect after completing, it is to avoid misjudgment phenomenon occur.
Referring to Fig. 1, this utility model mainly includes CPU, the first programming amplifying and AD conversion module U1, the second programming amplifying
And it is AD conversion module U2, alternating voltage testing current module U3, the first photoisolator G1, the second photoisolator G2, electronic
Pressure regulator TY, isolation boosting transformator T, constant-current source Is, sustained diode, current sampling resistor R, power supply relay J1, voltage
Sampling relay J 2, throw over relay J3, DC output terminal A1 and A2 and AC output terminal B1 and B2.
The model of the first programming amplifying and AD conversion module U1 and the second programming amplifying and AD conversion module U2 is AD7705,
Can complete amplification and the A/D conversion of signal, A1 and A2 is for demagnetization, direct current Analysis ofremanence and direct resistance metering, B1 and B2 is used for handing over
Stream Analysis ofremanence.Alternating voltage testing current module U3 uses electric energy meter chip CS5460, for gathering the electricity of Transformer Winding
Stream and voltage signal.The effect of the first photoisolator G1 and the second photoisolator G2 is that the high voltage preventing transformer side damages
Bad CPU.
Operation principle of the present utility model is as follows:
1, when apparatus selection uses demagnetization function, power supply control microprocessor relay J 1 adhesive, (straight by A1, A2
Stream lead-out terminal) charging of high voltage side of transformer winding is carried out demagnetization, microprocessor passes through the first programming amplifying and AD conversion mould
Block U1, the first photoisolator G1 gather the voltage V1 on current sampling resistor R, are then calculated by formula I=V1/R and fill
Electricity electric current, after electric current rises to necessarily (set) value, power supply control microprocessor relay J 1 disconnects, Transformer Winding electric energy
Being discharged by throw over relay J3, current sampling resistor R, sustained diode (or inverse electromotive force protection module), period is simultaneously
Gather the electric current of current sampling resistor R.When electric current continuously less than 5mA, after 10 seconds the first stage terminate.
Then microprocessor controls throw over relay J3 and changes the outbound course of power supply, in like manner test current sampling resistor R
On electric current, after electric current rises to necessarily (set) value, microprocessor control deenergization relay J 1, Transformer Winding electricity
Can be discharged by throw over relay J3, current sampling resistor R, sustained diode (or inverse electromotive force protection module), period is same
Time gather current sampling resistor R electric current.When electric current is continuously less than 5mA, after 10 seconds, second stage terminates.
The most repeatedly, it is possible to eliminate the remanent magnetism of the transformer core connect on DC output terminal A1, A2.
2, when apparatus selection uses direct current Analysis ofremanence function: microprocessor controls to switch on power relay J 1, passes through
High voltage side of transformer winding is charged by A1, A2 (DC output terminal), and microprocessor passes through the first programming amplifying and AD conversion mould
Block U1, the first photoisolator G1 gather the voltage V1 on current sampling resistor R, are then calculated by formula I=V1/R and fill
Electricity electric current, hole instrument high-speed is gathered the value of charging current, and is got off by microprocessor records.After electric current rises to 100mA, micro-
Processor controls deenergization relay J 1, and outside Transformer Winding electric energy is by throw over relay J3, current sampling resistor
R, sustained diode (or inverse electromotive force protection module) are discharged, the electric current of period high speed acquisition current sampling resistor R simultaneously.
When electric current continuously less than 5mA, after 10 seconds the first stage terminate.The current waveform of electric discharge under microprocessor records.
Then microprocessor controls throw over relay J3 and changes the outbound course of power supply, in like manner high speed test current sample electricity
Hindering the electric current on R and record, after electric current rises to 100mA, microprocessor controls deenergization relay J 1, transformator
Winding electric energy is discharged by throw over relay J3, current sampling resistor R, sustained diode (or inverse electromotive force protection module),
Period gathers the electric current of current sampling resistor R simultaneously.When electric current is continuously less than 5mA, after 10 seconds, second stage terminates.
By the most forward and reverse charging interval, can be accurately judged to whether this transformator has remanent magnetism.And at CPU even
The display module connect shows.
3, when apparatus selection uses exchange Analysis ofremanence function: it is slow from zero-bit that microprocessor controls electric voltage regulator TY
Boosting, voltage is risen through isolation boosting transformator T and doubles, exported to tested transformator by alternating voltage testing current module U3
Winding (now AC output terminal B1 with B2 is connected with Transformer Winding), the voltage electricity of follow-on test output in boost process
Stream, and record, after being increased to setting voltage (different transformator setting voltages is different), microprocessor controls electric adjustable
Depressor TY blood pressure lowering, the voltage x current of follow-on test output in pressure reduction, and record.By comparing boosting after having tested
The current curve of blood pressure lowering, it can be determined that whether tested transformator has remanent magnetism.
4, when apparatus selection direct resistance metering function, microprocessor controls to connect voltage sample relay J 2, the most first controls
Throw over relay J3 processed, making A1 end is electric current positive pole, and A2 end is electric current negative pole, then the relay J 1 that switches on power, by A1, A2 couple
Transformer Winding is charged.Microprocessor is by the first programming amplifying and AD conversion module U1, the first photoisolator G1 collection electricity
Voltage V1 on stream sampling resistor R, then calculates charging current by I=V1/R, when charging current reaches DC numerical control perseverance
After the continuous current of stream source Is, microprocessor is simultaneously by the second programming amplifying and AD conversion module U2, the second photoisolator
G2 gathers A1, A2 both end voltage V2, is calculated resistance value Rr of tested winding by formula Rr=V2/I.Microprocessor is surveyed continuously
Examination electric current I and magnitude of voltage V2, calculates resistance value Rr of tested winding, and is shown on the display screen of device.Instrument operator
After judging that data stabilization that D.C. resistance is tested is qualified, stopping test by stop key, now microprocessor controls deenergization and continues
Electrical equipment J1, the electric energy of tested Transformer Winding is by throw over relay J3, current sampling resistor R, sustained diode (or reversely
Electromotive force protection module) to discharge, period gathers the electric current of current sampling resistor R simultaneously.When electric current continuously less than 5mA, 10 seconds
Rear test terminates.
Claims (6)
1. a Multifunction transformer degaussing gear, is characterized in that, it include two DC output terminal, current detection circuit,
Voltage detecting circuit, fly-wheel diode (D) and the DC numerical control constant-current source (Is) controlled by CPU, power supply relay (J1) and
Throw over relay (J3), the negative pole of described DC numerical control constant-current source (Is) is straight with one through the pair of contact of throw over relay (J3)
Stream lead-out terminal connects, and positive pole is successively through another of power supply relay (J1), current sampling resistor (R) and throw over relay (J3)
Contact is connected with another DC output terminal；The negative electrode of described fly-wheel diode (D) connects the negative pole of constant-current source (Is), and anode connects
Between current sampling resistor (R) and power supply relay (J1), the output signal of described current sampling resistor (R) is examined by electric current
Slowdown monitoring circuit connects the input port of CPU, and the voltage between two DC output terminal connects the input of CPU by voltage detecting circuit
Mouthful.
Multifunction transformer degaussing gear the most according to claim 1, is characterized in that, also includes that exchanging remanent magnetism divides in composition
Analysis unit, described exchange Analysis ofremanence unit includes electric voltage regulator (TY), isolation boosting transformator (T), alternating voltage electric current
Test module (U3) and two AC output terminal, the input termination alternating voltage of described electric voltage regulator (TY), outfan leads to
Cross isolation boosting transformator (T) to be connected with two AC output terminal, the outfan controlling termination CPU of electric voltage regulator (TY)
Mouthful；The input of described alternating voltage testing current module (U3) is connected to the outfan of isolation boosting transformator (T), output termination
The input port of CPU.
Multifunction transformer degaussing gear the most according to claim 2, is characterized in that, described current detection circuit includes
One programming amplifying and AD conversion module (U1), the input termination current sample of described first programming amplifying and AD conversion module (U1)
The output signal of resistance (R), outfan connects the input port of CPU through the first photoisolator (G1).
Multifunction transformer degaussing gear the most according to claim 3, is characterized in that, described voltage detecting circuit includes
Two programming amplifying and AD conversion module (U2), the second photoisolator (G2) and voltage sample relay (J2), described second journey
Control is amplified and two inputs of AD conversion module (U2) connect two DC output ends respectively by voltage sample relay (J2)
Son, outfan connects the input port of CPU through the second photoisolator (G2).
Multifunction transformer degaussing gear the most according to claim 4, is characterized in that, described fly-wheel diode (D) is permissible
Substituted by inverse electromotive force protection module.
Multifunction transformer degaussing gear the most according to claim 5, is characterized in that, described alternating voltage testing current mould
Block (U3) uses electric energy meter chip CS5460.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620414238.3U CN205751741U (en) | 2016-05-09 | 2016-05-09 | A kind of Multifunction transformer degaussing gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620414238.3U CN205751741U (en) | 2016-05-09 | 2016-05-09 | A kind of Multifunction transformer degaussing gear |
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| Publication Number | Publication Date |
|---|---|
| CN205751741U true CN205751741U (en) | 2016-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620414238.3U Expired - Fee Related CN205751741U (en) | 2016-05-09 | 2016-05-09 | A kind of Multifunction transformer degaussing gear |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061872A (en) * | 2017-11-09 | 2018-05-22 | 国家电网公司 | The test method of remanent magnetism, device, storage medium and processor in current transformer |
| CN110828101A (en) * | 2018-08-14 | 2020-02-21 | 广州供电局有限公司 | Power transformer demagnetization and remanence measurement device |
-
2016
- 2016-05-09 CN CN201620414238.3U patent/CN205751741U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061872A (en) * | 2017-11-09 | 2018-05-22 | 国家电网公司 | The test method of remanent magnetism, device, storage medium and processor in current transformer |
| CN110828101A (en) * | 2018-08-14 | 2020-02-21 | 广州供电局有限公司 | Power transformer demagnetization and remanence measurement device |
| CN110828101B (en) * | 2018-08-14 | 2022-02-11 | 广东电网有限责任公司广州供电局 | Power transformer demagnetization and remanence measurement device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20190509 |
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| CF01 | Termination of patent right due to non-payment of annual fee |