CN207866906U - A kind of multichannel precision dielectric loss measuring instrument - Google Patents
A kind of multichannel precision dielectric loss measuring instrument Download PDFInfo
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- CN207866906U CN207866906U CN201820314084.XU CN201820314084U CN207866906U CN 207866906 U CN207866906 U CN 207866906U CN 201820314084 U CN201820314084 U CN 201820314084U CN 207866906 U CN207866906 U CN 207866906U
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- dielectric loss
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Abstract
The utility model discloses a kind of multichannel precision dielectric loss measuring instrument, including frequency converter, step-up transformers, reverse wiring current detection circuit, standard capacitance, measuring circuit and the display board being connected with measuring circuit, reverse wiring current detection circuit are connected by the way that communication module is isolated with measuring circuit；The output end of frequency converter is connected with the input terminal of step-up transformer, the output end of step-up transformer is connected with reverse wiring current detection circuit, high-voltage shielding line, standard capacitance respectively after high voltage isolator, the output end of reverse wiring current detection circuit is connected with Hi-pot test core wire, and the other end of standard capacitance is connected with measuring circuit.The utility model can realize automatic measurement, each interchannel is avoided to interfere with each other, improve measurement accuracy, primary connection can complete the measurement of each casing dielectric loss of transformer and capacitance, it completes multichannel to measure simultaneously, effectively reduces the experiment used time, improve working efficiency, labor intensity is reduced, the time shortens 2/3 or more.
Description
Technical field
The utility model belongs to test device field, and power equipment medium damage is measured using alien frequencies method more particularly, to a kind of
The anti-interference accurate dielectric loss measuring instrument of consumption and capacitance, measurement object includes the power equipments such as transformer, CVT, casing, especially
It is the occasion for needing the multiple casing dielectric losses of primary connection measuring transformer and multiple independent test products to need while measuring,
It is specifically related to a kind of multichannel precision dielectric loss measuring instrument.
Background technology
At present in routine test, the instrument for detecting bushing shell for transformer dielectric loss and capacitance is mostly that single channel measures,
It needs to shield transformer other casings in outside when measurement, need to repeatedly be taken out stitches and patching operations, process is cumbersome, takes
Shi Duo, heavy workload, efficiency is low, and test period is long.Domestic discrete units carried out the research in 4 channels, since it can not be solved
Interchannel interferes with each other problem, can only be inputted by Time-sharing control channel to carry out lane testing one by one, essence remains as list
Lane testing can not fundamentally improve efficiency.
Utility model content
For overcome the deficiencies in the prior art, a kind of multipurpose of the utility model offer is high-precision, can be carried out at the same time
The measurement in multiple channels, primary connection just can realize that the multichannel precision of each casing dielectric loss of transformer and electric capacity measuring is situated between
Matter loss measurent instrument.
Technical solution adopted by the utility model to solve its technical problems is：A kind of multichannel precision dielectric loss measurement
Instrument, including frequency converter, step-up transformer, reverse wiring current detection circuit, standard capacitance and are connected at measuring circuit with measuring circuit
Display board, the reverse wiring current detection circuit by be isolated communication module be connected with measuring circuit；The frequency converter it is defeated
Outlet is connected with the input terminal of step-up transformer, and the output end of step-up transformer is electric with reverse wiring respectively after high voltage isolator
Current detection circuit, high-voltage shielding line, standard capacitance are connected, output end and the Hi-pot test core wire phase of reverse wiring current detection circuit
Even, the other end of standard capacitance is connected with measuring circuit.
Further, the measuring circuit includes multiple input channel, and input channel includes first filter, trap successively
Device, amplification and rectification circuit, second filter, AD sampling units, CPU element.
Further, the measuring circuit just connects input channel including four.
Further, the frequency of the trapper is 50 Hz.
Further, the AD sampling units are AD7606 sampling A/D chips.
Further, the frequency of the variable-frequency variable-voltage voltage source of the frequency converter output is 45-65Hz.
Further, the output voltage of the step-up transformer is 0.5kV-12.0kV.
Further, the display board is equipped with the liquid crystal display for showing measurement process and measurement result, is additionally provided with defeated
Enter device.
Further, the display board is equipped with USB connectors.
Further, the display board is equipped with printer connector.
The utility model has the beneficial effects that：Automatic measurement may be implemented, successfully solve each interchannel and interfere with each other difficulty
Topic improves measurement accuracy, and primary connection can complete the measurement of each casing dielectric loss of transformer and capacitance, completes mostly logical
Road measures simultaneously, effectively reduces the experiment used time, improves working efficiency, reduces labor intensity, and the time shortens 2/3 or more.
Description of the drawings
Fig. 1 is the principles of the present invention block diagram.
Fig. 2 is the utility model measuring circuit functional block diagram.
Wherein：1, frequency converter；2, step-up transformer；3, reverse wiring current circuit；4, display board；5, measuring circuit；6、
Standard capacitance.
Specific implementation mode
In order to make those skilled in the art be better understood from the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, clear, complete description is carried out to the technical scheme in the embodiment of the utility model, it is clear that described
Embodiment is only a part of the embodiment of the utility model, instead of all the embodiments.Based on the reality in the utility model
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts is all answered
When the range for belonging to the utility model protection.
As shown in Figs. 1-2, a kind of multichannel precision dielectric loss measuring instrument, including frequency converter 1, step-up transformer 2, reversal connection
Line current detection circuit 3, standard capacitance 6, measuring circuit 5 and display board 4, the output end of frequency converter 1 are defeated with step-up transformer 2
Enter end to be connected, the high-voltage output end of step-up transformer 2 is divided into three tunnels by a high voltage isolator, examines with reversal connection line current respectively
Slowdown monitoring circuit 3, high-voltage shielding line, standard capacitance 6 one end be connected, reverse wiring current detection circuit 3 by be isolated communication module with
Measuring circuit 5 is connected, and the output end of reverse wiring current detection circuit 3 is connected electric as the test of test product with Hi-pot test core wire
Source, and the other end of standard capacitance 6 is connected with measuring circuit 5, measuring circuit 5 is connected with display board 4.
AC220V alternating currents (or generator) are after the input terminal of frequency converter 1, output frequency and the adjustable voltage of voltage
Source, then boosted transformer 2 export 0.5kV-12.0kV frequency conversion high-voltage power supply, High voltage output all the way with high-voltage shielding line phase
Even, as the high-tension shielding of test product, stray capacitance is shielded, it is ensured that obtain reliable measurement data, reduce it to measurement not
Profit influences；Another way is connected after reverse wiring current detection circuit 3 with Hi-pot test core wire, as the test power supply of test product,
Three tunnels are connected with standard capacitance 6.The output of reverse wiring current detection circuit 3 passes the output current of test product through communication module is isolated
Measuring circuit is given, the high-voltage output end of step-up transformer 2 is accessed in 6 one end of standard capacitance, and it is to measure that measuring circuit is accessed in one end
Circuit provides standard signal.
Measuring circuit 5 includes multiple input channel, and in this present embodiment, the measurement input that just connects of measuring circuit 5 contains
Up to four input channels, each input channel include first filter, trapper, amplification and rectification circuit, second filter,
AD sampling units, CPU element, each unit are linked in sequence.Measuring signal is sent to trapper after inputting first filter, falls into
Wave device filters out the interference signal of specific frequency, and the introducing of trapper alleviates the burden of CPU significantly, reduces Fourier transform
Data volume, for realize multichannel simultaneously measure provide necessary basis.The output of trapper is through amplification and rectification circuit, the second filter
Enter AD sampling units after wave device, in this present embodiment, AD sampling units are AD7606 sampling A/D chips, and CPU element reads AD and adopts
Interference is filtered using Fourier transform after the data of sample unit, isolates fundamental signal, normalized current and test product electric current are carried out
Vector calculus passes through the collected Measurement channel of 5 institute of measuring circuit and standard channel（Interior Cn inputs）Voltage magnitude is compared
Capacitance is relatively calculated, the phasometer by collecting two channel signals calculates capacitance and dielectric loss value.
During the test, start high pressure set point after measuring and variable-frequency power sources is sent to by display board 4, variable-frequency power sources will export
It is gradually adjusted to setting value, measuring circuit 5 is sent to variable-frequency power sources by height is surveyed, and forms negative-feedback and carries out closed loop adjusting, realizes
Accurate High voltage output；Automatic switching range is inputted according to the channel of setting and reads corresponding measurement data, is then had to all
It imitates data and carries out FFT transform, isolate signal fundamental wave, vector calculus is carried out to normalized current and test product electric current, that is, pass through
The collected data of 5 institute of measuring circuit and standard channel（Interior Cn inputs）Voltage magnitude be compared and calculate capacitance, lead to
Cross the phase difference calculating capacitance and dielectric loss value in acquired channel.After measurement, display board 4 sends out step-down instruction variable-frequency power sources
Slowly it is depressured to zero.
Display board 4 shows that current measurement process is connected with as a result, being additionally provided with printer connector with USB by liquid crystal display
Mouthful, so as to print and store measurement data by printer and USB flash disk；It is additionally provided with input unit on display board 4, using button
Carry out functional performance input.
Above-mentioned specific implementation mode is used for illustrating the utility model, rather than limits the utility model,
In the spirit and scope of the claims of the utility model, to any modifications and changes that the utility model is made, all fall
Enter the scope of protection of the utility model.
Claims (10)
1. a kind of multichannel precision dielectric loss measuring instrument, it is characterised in that：Including frequency converter（1）, step-up transformer（2）, instead
Wiring current detection circuit（3）, standard capacitance（6）, measuring circuit（5）And and measuring circuit（5）Connected display board（4）, institute
State reverse wiring current detection circuit（3）By the way that communication module and measuring circuit is isolated（5）It is connected；The frequency converter（1）Output
End and step-up transformer（2）Input terminal be connected, step-up transformer（2）Output end after high voltage isolator respectively with reversal connection
Line current detection circuit（3）, high-voltage shielding line, standard capacitance（6）It is connected, reverse wiring current detection circuit（3）Output end with
The connected test power supply as test product of Hi-pot test core wire, standard capacitance（6）The other end and measuring circuit（5）It is connected.
2. multichannel precision dielectric loss measuring instrument according to claim 1, it is characterised in that：The measuring circuit includes
Multiple input channel, input channel include first filter, trapper, amplification and rectification circuit, second filter, AD samplings successively
Unit, CPU element.
3. multichannel precision dielectric loss measuring instrument according to claim 1 or 2, it is characterised in that：The measuring circuit
Input channel is just connect including four.
4. multichannel precision dielectric loss measuring instrument according to claim 2, it is characterised in that：The frequency of the trapper
For 50 Hz.
5. multichannel precision dielectric loss measuring instrument according to claim 2, it is characterised in that：The AD sampling units are
AD7606 sampling A/D chips.
6. multichannel precision dielectric loss measuring instrument according to claim 1, it is characterised in that：The frequency converter（1）It is defeated
The frequency of the variable-frequency variable-voltage voltage source gone out is 45-65Hz.
7. multichannel precision dielectric loss measuring instrument according to claim 1, it is characterised in that：The step-up transformer
（2）Output voltage be 0.5kV-12.0kV.
8. multichannel precision dielectric loss measuring instrument according to claim 1, it is characterised in that：The display board is equipped with
Liquid crystal display for showing measurement process and measurement result, is additionally provided with input unit.
9. the multichannel precision dielectric loss measuring instrument according to claim 1 or 8, it is characterised in that：On the display board
Equipped with USB connectors.
10. the multichannel precision dielectric loss measuring instrument according to claim 1 or 8, it is characterised in that：On the display board
Equipped with printer connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820314084.XU CN207866906U (en) | 2018-03-07 | 2018-03-07 | A kind of multichannel precision dielectric loss measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820314084.XU CN207866906U (en) | 2018-03-07 | 2018-03-07 | A kind of multichannel precision dielectric loss measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207866906U true CN207866906U (en) | 2018-09-14 |
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ID=63455857
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820314084.XU Active CN207866906U (en) | 2018-03-07 | 2018-03-07 | A kind of multichannel precision dielectric loss measuring instrument |
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| Country | Link |
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| CN (1) | CN207866906U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111736018A (en) * | 2020-06-29 | 2020-10-02 | 广东电网有限责任公司 | Multi-channel dielectric loss measuring device and method |
| CN111983329A (en) * | 2020-08-25 | 2020-11-24 | 广东电网有限责任公司广州供电局 | Device and method for testing dielectric loss of transformer to ground |
-
2018
- 2018-03-07 CN CN201820314084.XU patent/CN207866906U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111736018A (en) * | 2020-06-29 | 2020-10-02 | 广东电网有限责任公司 | Multi-channel dielectric loss measuring device and method |
| CN111736018B (en) * | 2020-06-29 | 2022-05-13 | 广东电网有限责任公司 | Multi-channel dielectric loss measuring device and method |
| CN111983329A (en) * | 2020-08-25 | 2020-11-24 | 广东电网有限责任公司广州供电局 | Device and method for testing dielectric loss of transformer to ground |
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