CN205317894U - A two impedance return circuit interference rejection unit for appearance is put in office - Google Patents
A two impedance return circuit interference rejection unit for appearance is put in office Download PDFInfo
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- CN205317894U CN205317894U CN201520686380.9U CN201520686380U CN205317894U CN 205317894 U CN205317894 U CN 205317894U CN 201520686380 U CN201520686380 U CN 201520686380U CN 205317894 U CN205317894 U CN 205317894U
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Abstract
The utility model relates to a two impedance return circuit interference rejection unit for appearance is put in office, including power module, noise suicide circuit, noise suicide circuit includes a test loop and the 2nd test loop, and a test loop includes first measurement impedance and the equipment of awaiting measuring, and the 2nd test loop includes a coupling capacitance and second measurement impedance, still include measure and control module and man -machine interaction module. First measurement impedance and second measurement impedance resistance value equal, power module be connected with a test loop and the 2nd test loop respectively, measure and control module and man -machine interaction module electricity be connected. Voltage signal between first tie point among a test loop and the 2nd test loop and second tie point exports the measure and control module to calculation office high -volume.
Description
Technical field
This utility model relates to local discharge of electrical equipment detection technique field; It is specifically related to a kind of double; two impedance path interference rejection units for PD meter.
Background technology
It is known that electrical equipment is in operation, its insulating element is subject to the impact of the various factors such as electricity, heat, machinery, poor environment, and insulating properties can gradually degrade, so that defect occurs in apparatus insulated aspect, causes equipment fault. And the early discovery fault that Insulation monitoring and diagnostic techniques can go wrong at insulation of electrical installation parts; Particularly shelf depreciation measuring technology is as a kind of nondestructive measuring technology, is extensively used by people. Precisely and easily partial discharge test system is extremely important to the safe operation ensureing high voltage electric appliance quality and power system; Partial discharge test system product of the prior art is numerous and diverse various, Cleaning Principle also has multiple, for the presently the most common partial discharge test system based on pulse current method measurement, its agent structure is all similar to the structure shown in accompanying drawing 1, further combined with accompanying drawing 1, partial discharge test system of the prior art mainly includes without office's discharge source 01, booster transformer 02, protection impedance 03, coupling electric capacity 04, measures impedance 05, PD meter 06 and embedded data process and control centre 07; Described discharge source without office 01, booster transformer 02, protection impedance 03, coupling electric capacity 04, measurement impedance 05 and PD meter 06 are sequentially connected electrically; Described embedded data processes and electrically connects with without office's discharge source 01, booster transformer 02 and PD meter 06 respectively with control centre 07.
Further combined with accompanying drawing 2, partial discharge test system of the prior art is when the insulating properties of detecting electric equipment, although having been filtered and the interference signal of detected signal different frequency range by the effect of wave filter in measure loop, but yet suffer from and the disturbance current I of detected signal similar frequency bandsF2. The electrical equipment accepting detection is equivalent to Cx, the described Zm, actually measured office discharge stream I=V/Zm=I that measure in impedance and accompanying drawing 2 in measure loopF2+ Ix, and our required simply Ix, the I in measured current IF2It is interference signal, practice have shown that, above-mentioned interference signal IF2Existence the impact of test result is relatively larger, the signal to noise ratio causing signal is low, and the measuring accuracy of whole test system is not high.
In sum, it is badly in need of at present wanting the one can jamproof partial discharge test system.
Utility model content
The technical problems to be solved in the utility model is to provide one can anti-interference local discharge test system.
For solving above-mentioned technical problem, the utility model proposes a kind of double; two impedance path interference rejection units for PD meter:
Power module, for providing power supply for test device;
Codan, for the interference signal in suppression circuit, including the first test loop and the second test loop;
First test loop, is used for loading Devices to test, produces discharge current;
Second test loop, for providing a circulation path for discharge current;
Described codan is for the interference signal in suppression circuit;
Including the first measurement impedance in described first test loop, the second test loop includes the second measurement impedance, and both impedances are equal;
Measure and control module, for survey bureau's electric discharge pressure; And
Human-computer interaction module, is used for showing measurement result and providing interactive function.
Preferably, described first test loop also includes: Devices to test and for connecting the terminal of Devices to test;
Wherein, Devices to test is connected in the first test loop by terminal, and described first measures impedance connects with Devices to test;
Described second test loop also includes: coupling electric capacity, and described second measures impedance and couple capacitances in series.
Preferably, in described first test loop, Devices to test connects one end of terminal and electrically connects with the first measurement impedance, forms the first junction point; In described second test loop, one end of described coupling electric capacity is measured impedance with second and is electrically connected, and forms the second junction point; First junction point and the second junction point are respectively connecting to measure and control module.
Preferably, described measurement electrically connects with human-computer interaction module with controlling module; By measuring the voltage between the first junction point and the second junction point, calculating office is high-volume.
Preferably, calibration pulse generator is connected respectively to the two ends of the first measurement impedance, and is connected to sampling and control circuit.
Preferably, the described digital frequency range putting high voltage power supply without office is 0～400Hz. .
Preferably, described power module is integral type structure, include in power module digital without office put high voltage power supply, protection impedance and calibration pulse generator; Described digital put high voltage power supply without office and externally export electric energy after protection impedance; Described calibration pulse generator is connected respectively to the first measurement impedance and measures and control module. The power module adopted due to test system of the prior art includes the booster transformer that volume and weight is all quite huge so that whole system volume and weight is all very huge, and the movement of equipment is complicated with attended operation. This utility model adopts digital to be put high voltage power supply without office and instead of all very huge booster transformer of volume and weight, makes the volume and weight of whole test system significantly be declined, and movement and the attended operation of test system become simpler.
Preferably, described measurement is integral type structure with control module, measures and controls to include sampling and control circuit, the first wave filter and the second wave filter in module; Described first wave filter is connected to described first junction point; Described second adapter is connected to described second junction point. This structure optimizes the structure of whole test system further so that each parts are grouped together into module as much as possible, makes the I&M of test system more convenient.
Preferably, calibration pulse generator is connected respectively to the two ends of the first measurement impedance, and is connected to sampling and control circuit.
As preferably, described human-computer interaction module is PC. the human-computer interaction module adopted due to test system of the prior art remains embedded data process system, it is low to there is product integrated level in this system, function is simple, the weak point that the setting that user is in use correlated with is complicated with debugging operations, through making repeated attempts and comparing discovery, this utility model directly adopts the PC with windowing operation system as human-computer interaction module, because PC has powerful processor, Windowing man-machine interaction is also more directly perceived, PC is also equipped with the data subsequent treatment function of intensity simultaneously, if being made directly data analysis, make chart, PowerPoint etc., in sum, this preference substantially increases the integrated level of product, product function is also abundanter, the setting that user is in use correlated with is simpler with debugging operations to be understood.
As preferably, what described PC adopted is Windows operating system. Windows operating system has very powerful user base, and user gets final product left-hand seat substantially without carrying out extra training, so the test system versatility of employing Windows operating system is more excellent.
As it is preferred that, the described digital frequency range putting high voltage power supply without office is 0～400HZ. The frequency that power supply of the prior art can cover is rather narrow, device under test poor for applicability, therefore the creationary employing digital power of this utility model be 0～400HZ by the frequency optimization of power supply, and this frequency range substantially can be suitable for various Devices to test.
According to another aspect of the present utility model, it is provided that a kind of method utilizing said apparatus to carry out shelf depreciation test, it is characterised in that described method includes: Partial discharge signal is with the internal interference i of frequency bandfFlowing separately through the first test loop and the second test loop, in described first test loop, Devices to test equivalent capacity is Cx, coupling electric capacity in described second test loop is Ck; Office discharge stream ixThrough Devices to test equivalent capacity Cx, coupling electric capacity CkAnd first measure impedance Zm1Impedance Z is measured with secondm2, measure impedance and second first respectively and measure generation pressure drop v in impedancex1And vx2, wherein: measure impedance ZmThen it is designated as the first measurement impedance and second and measures impedance sum; Filtered amplification signal processing, A/D sampling uploads to PC or other data handling system processes, PC calculate striking out high-volume according to the computing formula preset.
More excellent: office's concrete computing formula high-volume is as follows: office is V high-volumexSize and ixIt is directly proportional:
vx=vx2-vx1
Further
vx=zm[2ix+(if2-if1)],
Disturbance current is (if2-if1), wherein, if1Represent the disturbance current component flowing through Devices to test, if2Representing the disturbance current component flowing through coupling electric capacity, disturbance current receives effective suppression.
More excellent: Devices to test connects first on loop, terminal place and measures the in opposite direction of disturbance current that the disturbance current that impedance flows through flows through with the second measurement impedance coupled on loop, electric capacity place, disturbance current is cancelled out each other a part.
Additionally, this utility model discloses a kind of office puts test system, including described pair of impedance path interference rejection unit.
After adopting technique scheme, this utility model has the advantages that this utility model is creationary and single impedance single loop of the prior art is measured system, it is improved to double, two impedance double loop and measures system, in test process, Devices to test connects measures the in opposite direction of disturbance current that impedance produces and the disturbance current of measurement impedance generation couple on loop, electric capacity place on loop, terminal place, disturbance current has been cancelled out each other a part, effectively suppressed, the design in double, two impedance measurement loops simultaneously, making the office that this utility model system is tested put voltage signal is in prior art 2 times of the voltage signal of single impedance path, namely useful signal is exaggerated, interference signal is suppressed, the signal to noise ratio of naturally whole measurement system is greatly improved, certainty of measurement is also higher.
Accompanying drawing explanation
Fig. 1 is the structure square frame simplified schematic diagram of partial discharge test system in prior art;
Fig. 2 is the basic test circuit diagram of partial discharge test system in prior art;
Fig. 3 is the structure block diagram of the double; two impedance path interference rejection unit of this utility model;
Fig. 4 is the basic test circuit diagram of the double; two impedance path interference rejection unit of this utility model.
As shown in Figure 1, 2: in prior art: 01, without office's discharge source, 02, booster transformer, 03, protection impedance, 04, coupling electric capacity, 05, measure impedance, 06, PD meter, 07, embedded data processes and control centre.
As shown in Figure 3,4, in this utility model: 1, power module, 2, first measures impedance; 3, second measure impedance, 4, coupling electric capacity, 5, Devices to test connect terminal; 6, measure and control module, 7, PC, 8, digital put high voltage power supply without office; 9, protection impedance; 10, calibration pulse generator, 11, sampling and control circuit, the 12, first wave filter; 13, the second wave filter, 14, Devices to test.
Detailed description of the invention
It is described in further detail below in conjunction with 1 to 4 pair of this utility model of accompanying drawing.
In conjunction with accompanying drawing 3 and accompanying drawing 4, a kind of double; two impedance path interference rejection units for PD meter, including power module 1 for providing power supply for test device, also include measuring impedance, coupling electric capacity 4, Devices to test connection terminal 5, measuring and control module 6 and human-computer interaction module; Described impedance of measuring includes the first measurement impedance 2 and the second measurement impedance 3 that resistance value is equal; Codan, for the interference signal in suppression circuit, including the first test loop and the second test loop, in first test loop, Devices to test connects one end of terminal 5 and electrically connects with controlling module 6 with the first measurement impedance 2 and measurement respectively, forms the first junction point, and the other end is connected to power module 1, first test loop is used for loading Devices to test, produces discharge current; Described power module 1 is connected terminal 5 electrically connects with coupling electric capacity 4 and Devices to test respectively; In second test loop, one end of described coupling electric capacity 4 is measured impedance 3 and measurement respectively and is electrically connected with controlling module 6 with second, forms the second junction point, and the other end is connected to power module 1, and the second test loop is for providing a circulation path for discharge current; First measurement impedance 2 and the second measurement impedance 3 all electrically connect with power module 1, and both impedances are equal; Described measurement electrically connects with human-computer interaction module with controlling module 6; By measuring the voltage between the first junction point and the second junction point, further calculating office is high-volume.
After adopting said structure, this utility model has the advantages that this utility model is creationary and single impedance single loop of the prior art is measured system, it is improved to double, two impedance double loop and measures system, in test process, Devices to test connects measures the in opposite direction of disturbance current that impedance produces and the disturbance current of measurement impedance generation couple on loop, electric capacity 4 place on loop, terminal 5 place, disturbance current has been cancelled out each other a part, effectively suppressed, the design in double, two impedance measurement loops simultaneously, making the office that this utility model system is tested put voltage signal is in prior art 2 times of the voltage signal of single impedance path, namely useful signal is exaggerated, interference signal is suppressed, the signal to noise ratio of naturally whole measurement system is greatly improved, certainty of measurement is also higher.
Further combined with accompanying drawing 4, the beneficial effects of the utility model are carried out quantitative analysis, it can be seen that Partial discharge signal is with the internal interference i of frequency bandfFlow separately through test product Cx[i.e. Devices to test equivalent capacity, test product and Devices to test] and coupling electric capacity CkArticle two, loop;And office discharge stream ixThrough test product, coupling electric capacity and measurement impedance Zm, measure impedance and second first respectively and measure generation pressure drop v in impedancex1And vx2; The signal processing such as filtered amplification, A/D sampling uploads to PC or other data handling system processes, PC calculate striking out high-volume according to the computing formula preset.
Concrete computing formula is as follows: office's size high-volume and ixBeing directly proportional, traditional method, for singly to measure impedance, does not namely have first in circuit diagram to measure impedance, is according to vx2=Zm.(ix+if2) calculate obtain office high-volume; And this utility model is double; two impedance path vx=vx2-vx1, further vx=zm[2ix+(if2-if1)], both contrasts are it is found that when same office's discharge stream, and it is traditional 2 times that voltage signal is put in the office of this utility model; Further analyzing, disturbance current receives effective suppression, and traditional disturbance current is if2, and this utility model is (if2-if1), it is evident that signal to noise ratio is greatly improved.
In sum, this utility model provides the partial discharge test system that a kind of measuring accuracy is higher, including aforesaid pair of impedance path interference rejection unit.
As preferably, described human-computer interaction module is PC 7. due to it is found by the applicant that the human-computer interaction module that test system of the prior art adopts remains embedded data process system, it is low to there is product integrated level in this system, function is simple, the weak point that the setting that user is in use correlated with is complicated with debugging operations, applicant is through making repeated attempts and comparing discovery, directly adopt the PC with windowing operation system as human-computer interaction module, because PC has powerful processor, Windowing man-machine interaction is also more directly perceived, PC is also equipped with the data subsequent treatment function of intensity simultaneously, if being made directly data analysis, make chart, PowerPoint etc., in sum, this preference substantially increases the integrated level of product, product function is also abundanter, the setting that user is in use correlated with is simpler with debugging operations to be understood.
As preferably, described power module 1 is integral type structure, include in power module 1 digital without office put high voltage power supply 8, protection impedance 9 and calibration pulse generator 10; Described digital put high voltage power supply 8 without office and externally export electric energy after protection impedance 9; Described calibration pulse generator 10 is measured impedance 2 and measurement respectively and is electrically connected with controlling module 6 with first. Owing to applicant further found that the power module that test system of the prior art adopts includes the booster transformer that volume and weight is all quite huge so that whole system volume and weight is all very huge, the movement of equipment is complicated with attended operation. Further innovation through applicant, adopt and digital put high voltage power supply 8 without office and instead of all very huge booster transformer of volume and weight, the volume and weight making whole test system is significantly declined, and the movement of test system becomes simpler with attended operation.
As preferably, described measurement is integral type structure with control module 6, measures and controls to include in module 6 sampling and control circuit the 11, first wave filter 12 and the second wave filter 13; The first described wave filter 12 and the second wave filter 13 all electrically connect with control circuit 11 with sampling, and the first described wave filter 12 electrically connects with the first electric signal input end measuring impedance 2 simultaneously; The second described wave filter 13 electrically connects with the second electric signal input end measuring impedance 3 simultaneously.This structure optimizes the structure of whole test system further so that each parts are grouped together into module as much as possible, makes the I&M of test system more convenient.
As preferably, what described PC 7 adopted is Windows operating system. Windows operating system has very powerful user base, and user gets final product left-hand seat substantially without carrying out extra training, so the test system versatility of employing Windows operating system is more excellent.
As it is preferred that, the described digital frequency range putting high voltage power supply 8 without office is 0～400HZ. The frequency that power supply of the prior art can cover is rather narrow, device under test poor for applicability, therefore the creationary employing digital power of applicant be 0～400HZ by the frequency optimization of power supply, and this frequency range substantially can be suitable for various Devices to test.
Above this utility model and embodiment thereof being described, this description does not have restricted, and shown in accompanying drawing is also one of embodiment of the present utility model, and actual structure is not limited thereto. If generally speaking those of ordinary skill in the art is enlightened by it, when creating objective without departing from this utility model, design the frame mode similar to this technical scheme and embodiment without creationary, protection domain of the present utility model all should be belonged to.
Claims (9)
1. the double; two impedance path interference rejection units for PD meter, it is characterised in that this device includes:
Power module, for providing power supply for test device;
Codan, for the interference signal in suppression circuit, including the first test loop and the second test loop;
First test loop, is used for loading Devices to test, produces discharge current;
Second test loop, for providing a circulation path for discharge current;
Described codan is for the interference signal in suppression circuit;
Including the first measurement impedance in described first test loop, the second test loop includes the second measurement impedance, and both impedances are equal;
Measure and control module, for survey bureau's electric discharge pressure; And
Human-computer interaction module, is used for showing measurement result and providing interactive function.
2. according to claim 1 pair of impedance path interference rejection unit, it is characterised in that:
Described first test loop also includes: Devices to test and for connecting the terminal of Devices to test;
Wherein, Devices to test is connected in the first test loop by terminal, and described first measures impedance connects with Devices to test;
Described second test loop also includes: coupling electric capacity, and described second measures impedance and couple capacitances in series.
3. according to claim 2 pair of impedance path interference rejection unit, it is characterised in that: in described first test loop, Devices to test connects one end of terminal and electrically connects with the first measurement impedance, forms the first junction point; In described second test loop, one end of described coupling electric capacity is measured impedance with second and is electrically connected, and forms the second junction point; First junction point and the second junction point are respectively connecting to measure and control module.
4. according to claim 3 pair of impedance path interference rejection unit, it is characterised in that:
Described measurement electrically connects with human-computer interaction module with controlling module; By measuring the voltage between the first junction point and the second junction point, calculating office is high-volume.
5. according to claim 3 pair of impedance path interference rejection unit, it is characterised in that:
Described power module is integral type structure;
Include in described power module digital without office put high voltage power supply, protection impedance and calibration pulse generator; Described digital put high voltage power supply without office and externally export electric energy after protection impedance; Described calibration pulse generator is connected respectively to the first measurement impedance and measures and control module.
6. according to claim 5 pair of impedance path interference rejection unit, it is characterised in that: described measurement is integral type structure with control module, measures and controls to include sampling and control circuit, the first wave filter and the second wave filter in module; Described first wave filter is connected to described first junction point; Described second adapter is connected to described second junction point.
7. according to claim 6 pair of impedance path interference rejection unit, it is characterised in that: calibration pulse generator is connected respectively to the two ends of the first measurement impedance, and is connected to sampling and control circuit.
8. according to claim 6 pair of impedance path interference rejection unit, it is characterised in that: the described digital frequency range putting high voltage power supply without office is 0～400Hz.
9. according to claim 3 pair of impedance path interference rejection unit, it is characterised in that: Partial discharge signal is with the internal interference i of frequency bandfFlowing separately through the first test loop and the second test loop, described Devices to test equivalent capacity is Cx, coupling electric capacity is Ck; Office discharge stream ixThrough Devices to test equivalent capacity Cx, coupling electric capacity CkAnd first measure impedance Zm1Impedance Z is measured with secondm2, measure impedance and second first respectively and measure generation pressure drop v in impedancex1And vx2, wherein: measure impedance ZmThen it is designated as the first measurement impedance and second and measures impedance sum;
Filtered amplification, A/D sampling uploads to PC or other data handling system processes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520686380.9U CN205317894U (en) | 2015-09-07 | 2015-09-07 | A two impedance return circuit interference rejection unit for appearance is put in office |
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| CN201520686380.9U CN205317894U (en) | 2015-09-07 | 2015-09-07 | A two impedance return circuit interference rejection unit for appearance is put in office |
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| CN205317894U true CN205317894U (en) | 2016-06-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093085A (en) * | 2015-09-07 | 2015-11-25 | 湖南银河天涛科技有限公司 | Dual-impedance loop interference suppression device for partial discharge measuring instrument |
-
2015
- 2015-09-07 CN CN201520686380.9U patent/CN205317894U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093085A (en) * | 2015-09-07 | 2015-11-25 | 湖南银河天涛科技有限公司 | Dual-impedance loop interference suppression device for partial discharge measuring instrument |
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Address after: Room 101-301, building D3, Jinrong Wangcheng science and Technology Industrial Park, 858 Purui West Road, Wangcheng economic and Technological Development Zone, Changsha City, Hunan Province, 410200 Patentee after: Hunan Tiantao Technology Co.,Ltd. Address before: 410199 43 / F, Xiangshang Shiji Xincheng, 17 Kaiyuan Road, Jingkai District, Changsha City, Hunan Province Patentee before: HUNAN YINHE TIANTAO TECHNOLOGY Co.,Ltd. |
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