CN204129150U - A kind of on-line measuring device of power equipment - Google Patents
A kind of on-line measuring device of power equipment Download PDFInfo
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- CN204129150U CN204129150U CN201420681556.7U CN201420681556U CN204129150U CN 204129150 U CN204129150 U CN 204129150U CN 201420681556 U CN201420681556 U CN 201420681556U CN 204129150 U CN204129150 U CN 204129150U
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- 230000000474 nursing effect Effects 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 7
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- 238000005070 sampling Methods 0.000 claims description 32
- 230000005284 excitation Effects 0.000 claims description 8
- 230000010363 phase shift Effects 0.000 claims description 8
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Abstract
The utility model discloses a kind of on-line measuring device of power equipment, wherein device comprises: computing machine and at least one test cell; Computing machine creates and has at least one virtual instrument; Virtual instrument comprises data acquisition unit; Each test cell comprises sensor, signal condition unit and tested power equipment; Wherein, sensor is connected with tested power equipment, for obtaining the sampled signal of tested power equipment and sampled signal being sent to signal condition unit; Signal condition unit is used for nursing one's health sampled signal, carries out filtering process and be converted into sampled data that computing machine can identify and send it to computing machine by data acquisition unit it; Computing machine is used for carrying out analyzing and processing acquisition test result and call the virtual instrument corresponding with tested power equipment showing test result to sampled data.The utility model facilitates the joint test of entry, reduces hardware cost, improves work efficiency.
Description
Technical field
The utility model relates to field of power detection, particularly a kind of on-line measuring device of power equipment.
Background technology
In propelling intelligent grid process of construction, first the self-healing ability of electrical network is be based upon on the self diagnosis basis of each high voltage electric equipment, and detection technique is the technical foundation realizing self diagnosis.The test apparatus used in current on-the-spot customary or diagnostic test is substantially all based on MCU(Micro Control Unit, micro-control unit) structure, often kind of test apparatus has Special circuit board for completing specific Functional Design, for certain pilot project, this test apparatus Design Mode has high reliability, high performance-price ratio feature.If but various pilot project is combined, the drawback of this test apparatus just comes out.One is that different tests instrumental function structure is different, and testing crew will be familiar with the using method of often kind of test apparatus and the external packing structure of test apparatus; Two is various test apparatus self-organizing systems, and the interface that different tests appliance requires is different and communications protocol and upper machine communication, the test apparatus even had just does not have network savvy at all.Not there is common segment, be unfavorable for building of pilot system platform.
Summary of the invention
The purpose of this utility model is the on-line measuring device and the method that provide a kind of power equipment, to facilitate the joint test of entry, reduces hardware cost, increases work efficiency.
Based on above-mentioned purpose, the utility model embodiment provides a kind of on-line measuring device of power equipment, and device comprises:
Computing machine and at least one test cell; Computing machine creates and has at least one virtual instrument; Virtual instrument comprises data acquisition unit;
Each test cell comprises sensor, signal condition unit and tested power equipment;
Wherein, sensor is connected with tested power equipment, for obtaining the sampled signal of tested power equipment and sampled signal being sent to signal condition unit;
Signal condition unit is used for nursing one's health sampled signal, carries out filtering process and be converted into sampled data that computing machine can identify and send it to computing machine by described data acquisition unit it;
Computing machine is used for carrying out analyzing and processing acquisition test result and call the virtual instrument corresponding with tested power equipment showing test result to sampled data.
Preferably, on computing machine, establishment has multiple virtual instrument.
Preferably, device also comprises: driving source, for providing excitation to tested power equipment;
Or;
Computing machine is also for providing excitation to tested power equipment.
Preferably, tested power equipment is lightning arrester resistance type current tester;
Sensor comprises current transformer and voltage transformer (VT);
Current transformer is for obtaining the current sampling signal of lightning arrester resistance type current tester;
Voltage transformer (VT) is for obtaining the voltage sampling signal of lightning arrester resistance type current tester;
Signal condition unit, specifically for nursing one's health current sampling signal and voltage sampling signal, is converted to the sampled data that computing machine can identify, and carries out signal zero crossing conditioning to voltage sampling signal.
Preferably, signal condition unit, specifically for voltage sampling signal is carried out waveform comparison with reference signal successively by continuous phase shift, judges waveform similarity coefficient and when waveform similarity coefficient is not more than predetermined threshold value, calculates phase shift angular difference; Wherein, reference signal defines with one of them voltage sampling signal.
Preferably, current transformer is punching height magnetic conduction current transformer or the high-precision current transformer of low magnetism leakage.
Preferably, signal condition unit is digital signal circuit.
Preferably, data acquisition unit is build-in function plug-in card, general purpose interface bus interface card, serial port or the vxi bus tool interface system based on PC.
The beneficial effects of the utility model are:
The utility model, by creating virtual instrument on computers, achieves and simulates the test of various test apparatus to power equipment on computers.Same computing machine can create multiple virtual instrument, to simulate multiple test apparatus, facilitate the joint test of entry, reduce hardware cost.And with regard to a certain virtual instrument, realize the change of working mechanism by amendment G language, and realize without the need to Amending design schematic diagram continuous as conventional test instrument and circuit board, improve work efficiency.
Accompanying drawing explanation
Fig. 1 is the on-line measuring device structural drawing of the wire communication power equipment of embodiment one;
Fig. 2 is the on-line measuring device structural drawing of the radio communication power equipment of embodiment one;
Fig. 3 is the on-line measuring device structural drawing of the lightning arrester resistance type current tester of embodiment one;
Fig. 4 is that signal condition unit carries out the process flow diagram of signal zero crossing conditioning to voltage sampling signal;
Fig. 5 is the online test method process flow diagram of the power equipment of embodiment two.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment one provides a kind of on-line measuring device of power equipment, and see Fig. 1, this device comprises:
At least one test cell and computing machine.Computing machine in the utility model can be PC or industrial computer or relevant virtual terminal etc.
Multiple test cell can be comprised in the utility model.
Wherein each test cell comprises sensor 11, signal condition unit 12 and tested power equipment 13.
Computing machine creates to have at least one virtual instrument 14(figure and only illustrates one).Virtual instrument 14 is made up of data acquisition unit 141, drive software and Virtual Instrument.Wherein, data acquisition unit 141 is hardware interface, can be specifically the various equipment such as build-in function plug-in card, general purpose interface bus interface card, serial port, vxi bus tool interface system based on PC, drive software is the driver directly controlling various hardware interface, virtual instrument carries out communication by bottom layer driving software and real system, and shows the various controls corresponding with true instrument panel operation element on the computer screen with the form of Virtual Instrument.The panel of user's mouse-based operation virtual instrument is as biconditional operation true instrument is equally true and convenience.
In the utility model, multiple virtual instrument can share a hardware interface.Certainly for special test, also special hardware interface can be set.
Virtual instrument is corresponding with test cell.As when tested power equipment is electric energy quality harmonic analyser, the panel of corresponding virtual instrument is just provided with the interface relevant to power quality analyzer, control etc., same, when tested power equipment is lightning arrester resistance type current tester, the panel of corresponding virtual instrument is just provided with the interface, control etc. relevant to lightning arrester resistance type current tester.
In actual applications, often need various pilot project to combine to test.For this reason, the virtual instrument of multiple correspondence can be created on computers, to test multiple tested power equipment.
When initialization, computing machine needs to send initialization directive to data acquisition unit 141 usually, selects the passage etc. that will open.
In testing, sensor 11 is connected with tested power equipment 13, for obtaining the sampled signal of tested power equipment 13 and sampled signal being sent to signal condition unit 12.
Signal condition unit 12, for nursing one's health sampled signal, carries out filtering process to it and is converted into sampled data that computing machine can identify and it is sent to computing machine by data acquisition unit 141.What this signal condition unit 12 was concrete can be digital signal circuit.
It is the signal type that computing machine can receive and identify that the conditioning that it should be explicitly made clear at this point herein had both comprised the type conversion of sampled signal, also comprises the smoothing process of sampled signal to obtain more effective signal etc.
Computing machine is used for carrying out analyzing and processing acquisition test result and call the virtual instrument corresponding with tested power equipment 13 14 pairs of test results showing to sampled data
Wherein, the processor 15 of computing machine shows specifically for carrying out analyzing and processing acquisition test result to sampled data and calling the virtual instrument corresponding with tested power equipment 13 14 pairs of test results.
In concrete test, the power equipment having some tested needs additional direct current or the cooperation of ac-excited source to measure, as equipment such as direct-current resistance tester for transformer, mutual inductor no-load voltage ratio tester, Insulation Resistance Testers.For this reason, in embodiment of the present utility model, described pick-up unit also comprises: driving source 16, for providing excitation to tested power equipment.When tested power equipment required voltage is smaller, also excitation can be provided with computing machine directly to tested power equipment.
Further, different tested power equipment or agree to that the driving source that tested power equipment needed in the different time is different, controls driving source by computing machine for this reason.
The utility model is on-line measuring device, and test cell 1 can be communicated with computing machine by the wired mode shown in the wireless or Fig. 2 shown in Fig. 1.
In Fig. 1, voltage sampling signal is sent to computing machine by RF transmitter unit 171, RF receiving element 172 by signal condition unit 12.
Fig. 2 comprises sensor 21, signal condition unit 22 and tested power equipment 23, computing machine and driving source 26.Its Computer there is processor 25 and create to have in multiple virtual instrument 24(figure only illustrate one), virtual instrument 24 has data acquisition unit 241.
The difference of itself and Fig. 1 is, voltage sampling signal is sent to computing machine by wired mode by signal condition unit.
The utility model compared to existing technology, realizes the detection to multiple power equipment by a computing machine, reduces hardware cost, achieve the joint test of entry.
Below, for tested power equipment lightning arrester resistance type current tester, the utility model is described in detail.
As shown in Figure 3, the on-line measuring device of lightning arrester resistance type current tester comprises tested lightning arrester resistance type current tester 31, sensor, signal condition unit 33, virtual terminal 34, the processor 36 of virtual terminal 34 and the virtual instrument 35 that is created on virtual terminal 34.Wherein virtual instrument 35 also comprises data acquisition unit 351.
Wherein sensor comprises current transformer 321 and voltage transformer (VT) 322.
Current transformer 321 is for obtaining the current sampling signal of lightning arrester resistance type current tester 31.Whether allow according to lightning arrester resistance type current tester 31 difference changing primary connection mode, the utility model can adopt and install the mode of punching height magnetic conduction current transformer in the discharge counter lower end of lightning arrester resistance type current tester 31 additional or the mode that adopts the high-precision current transformer of low magnetism leakage to be attempted by discharge counter two ends obtains current sampling signal.
Voltage transformer (VT) 322 is for obtaining the voltage sampling signal of lightning arrester resistance type current tester 31.
Signal condition unit 33, specifically for nursing one's health current sampling signal and voltage sampling signal, is converted to the sampled data that virtual terminal 34 can identify.When sampled voltage signal, the error of level angle signal will in controlled range, to ensure the correctness measured.
Zero-cross comparator method determination voltage waveform differential seat angle is adopted in the utility model, namely two corresponding zero crossings in the time cycle of two waveforms are taken out, calculate the mistiming between these two zero points, compare with the whole time cycle, then extrapolate the phase angle difference of two waveforms.The feature of this method is direct, and do not have too much operand, speed is fast.But shortcoming be to zero crossing acquisition enough accurate, not so can cause very big error, but in the course of work of high-tension line, instrument may be in the strong interference of electromagnetic field, causes difficulty to accurately obtaining of zero crossing.
In order to avoid the problem the utility model being difficult to catch zero crossing can take following alternative, reference signal is defined as by a voltage sampling signal, its waveform is decided to be reference waveform, another voltage sampling signal is compared with it, by the continuous phase shift to comparison signal, come to carry out waveform comparison with reference signal, when waveform similarity coefficient meets the requirements, calculate phase shift angular difference to decompose the resistive current component obtaining lightning arrester.
Sampled data after conditioning is sent to virtual terminal 34 by data acquisition unit 351 by signal condition unit 33, and carries out analyzing and processing acquisition test result by processor 36, calls corresponding volume virtual instrument 35 afterwards and shows.
The utility model, based on the setting of virtual instrument, can utilize shared computer platform, tests multiple power equipment, eliminates the cost of special test equipment.And, for same virtual instrument, G language can be revised to realize the change of instrument working mechanism, instead of resemble continuous Amending design schematic diagram and circuit board General Instrument design and realize, improve work efficiency.
Corresponding said method, the utility model embodiment two additionally provides a kind of online test method of power equipment, is applied in as in above-mentioned on-line measuring device.As shown in Figure 5, the method comprises:
S11, sensor obtain the sampled signal of tested power equipment and sampled signal are sent to signal condition unit.
S12, signal condition unit are nursed one's health sampled signal, carry out filtering process be converted into sampled data that computing machine can identify and it is sent to computing machine by data acquisition unit it.What this signal condition unit was concrete can be digital signal circuit.
The utility model can be line and detects, and signal condition unit can be communicated with computing machine by the wired mode shown in the wireless mode shown in Fig. 1 or Fig. 2.
S13, computing machine carry out analyzing and processing acquisition test result and call the virtual instrument corresponding with tested power equipment showing test result to sampled data.Computing machine in the utility model can be PC or industrial computer or relevant virtual terminal etc.
In concrete test, the power equipment having some tested needs additional direct current or the cooperation of ac-excited source to measure, as equipment such as direct-current resistance tester for transformer, mutual inductor no-load voltage ratio tester, Insulation Resistance Testers.For this reason, in embodiment of the present utility model, described pick-up unit also comprises: driving source, provides excitation to tested power equipment.When tested power equipment required voltage is smaller, also excitation can be provided with computing machine directly to tested power equipment.
For tested power equipment for lightning arrester resistance type current tester, its sensor comprises current transformer and voltage transformer (VT).Its flow process is as follows:
The sampled signal that sensor obtains tested power equipment comprises.
Current transformer obtains the current sampling signal of lightning arrester resistance type current tester, and voltage transformer (VT) obtains the voltage sampling signal of lightning arrester resistance type current tester.
Signal condition unit is nursed one's health current sampling signal and voltage sampling signal, is converted to the sampled data that computing machine can identify, and carries out signal zero crossing conditioning to voltage sampling signal.
Wherein carry out signal zero crossing conditioning to voltage sampling signal to comprise:
Voltage sampling signal is carried out waveform comparison with reference signal successively by continuous phase shift, judges waveform similarity coefficient; Reference signal defines with voltage sampling signal described in one of them;
If when waveform similarity coefficient is not more than predetermined threshold value, calculate phase shift angular difference.
The utility model can on-line real-time measuremen equipment state, can generate various data and curves or control power equipment by generating relevant control instruction to the analysis of data by platforms such as industrial computers; Whether as being only used to carry out routine test, then can have access to the historical data stored in database, scene completes comparing work, continue to run the decision-making foundation providing efficient quick to equipment.
It should be noted that, apparatus and method embodiment of the present utility model is corresponding, and relevant portion can reference mutually.
Above specific embodiment, the purpose of this utility model, technical scheme and beneficial effect are further described, it should be noted, these are only a specific embodiment of the present utility model, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (6)
1. an on-line measuring device for power equipment, is characterized in that, described device comprises:
Computing machine and at least one test cell; Described computing machine creates and has at least one virtual instrument; Described virtual instrument comprises data acquisition unit;
Each described test cell comprises sensor, signal condition unit and tested power equipment;
Wherein, described sensor is connected with described tested power equipment, for obtaining the sampled signal of described tested power equipment and described sampled signal being sent to described signal condition unit;
Described signal condition unit is used for nursing one's health described sampled signal, carries out filtering process and be converted into sampled data that described computing machine can identify and send it to described computing machine by described data acquisition unit described sampled signal;
Described computing machine is used for carrying out analyzing and processing acquisition test result and call the virtual instrument corresponding with tested power equipment showing described test result to described sampled data;
Wherein, described tested power equipment is lightning arrester resistance type current tester, and described sensor comprises current transformer and voltage transformer (VT);
Described current transformer is for obtaining the current sampling signal of described lightning arrester resistance type current tester, and described voltage transformer (VT) is for obtaining the voltage sampling signal of described lightning arrester resistance type current tester;
Described current transformer is the punching height magnetic conduction current transformer of the discharge counter lower end being arranged on lightning arrester resistance type current tester or described current transformer is the high-precision current transformer of low magnetism leakage being attempted by described discharge counter two ends;
Described signal condition unit, specifically for nursing one's health described current sampling signal and described voltage sampling signal, is converted to the sampled data that described computing machine can identify, and carries out signal zero crossing conditioning to described voltage sampling signal.
2. on-line measuring device as claimed in claim 1, is characterized in that, described computing machine creates multiple virtual instrument.
3. on-line measuring device as claimed in claim 1, it is characterized in that, described device also comprises: driving source, for providing excitation to described tested power equipment;
Or;
Described computing machine is also for providing excitation to described tested power equipment.
4. on-line measuring device as claimed in claim 1, it is characterized in that, described signal condition unit is specifically for carrying out waveform comparison with reference signal by described voltage sampling signal successively by continuous phase shift, judge waveform similarity coefficient and when described waveform similarity coefficient is not more than predetermined threshold value, calculate phase shift angular difference; Wherein, described reference signal defines with voltage sampling signal described in one of them.
5. on-line measuring device as claimed in claim 1, it is characterized in that, described signal condition unit is digital signal circuit.
6. on-line measuring device as claimed in claim 1, it is characterized in that, described data acquisition unit is build-in function plug-in card, general purpose interface bus interface card, serial port or vxi bus tool interface system based on PC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420681556.7U CN204129150U (en) | 2013-11-14 | 2014-11-12 | A kind of on-line measuring device of power equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320718662 | 2013-11-14 | ||
| CN201320718662.3 | 2013-11-14 | ||
| CN201420681556.7U CN204129150U (en) | 2013-11-14 | 2014-11-12 | A kind of on-line measuring device of power equipment |
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| CN204129150U true CN204129150U (en) | 2015-01-28 |
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| CN201420681556.7U Expired - Fee Related CN204129150U (en) | 2013-11-14 | 2014-11-12 | A kind of on-line measuring device of power equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389266A (en) * | 2019-07-12 | 2019-10-29 | 湖南沛科交通工程技术股份有限公司 | A kind of LoRa is wireless electromechanical equipment test macro and its test method |
| CN110579667A (en) * | 2019-10-22 | 2019-12-17 | 李玉玲 | Power system analysis method |
-
2014
- 2014-11-12 CN CN201420681556.7U patent/CN204129150U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389266A (en) * | 2019-07-12 | 2019-10-29 | 湖南沛科交通工程技术股份有限公司 | A kind of LoRa is wireless electromechanical equipment test macro and its test method |
| CN110579667A (en) * | 2019-10-22 | 2019-12-17 | 李玉玲 | Power system analysis method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20191112 |