CN101609135A - PT charge on-line detection device and detection method - Google Patents
PT charge on-line detection device and detection method Download PDFInfo
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- CN101609135A CN101609135A CNA2009103036659A CN200910303665A CN101609135A CN 101609135 A CN101609135 A CN 101609135A CN A2009103036659 A CNA2009103036659 A CN A2009103036659A CN 200910303665 A CN200910303665 A CN 200910303665A CN 101609135 A CN101609135 A CN 101609135A
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Abstract
The present invention relates to the electric signal technical field of measurement and test, particularly a kind of PT charge on-line detection device and detection method, this pick-up unit comprises little current sampling circuit and voltage sample circuit, Single Chip Microcomputer (SCM) system and the hand-held mobile terminal that is used to gather PT secondary side current and voltage signal, little current sampling circuit, voltage sample circuit are connected with Single Chip Microcomputer (SCM) system respectively, and Single Chip Microcomputer (SCM) system is connected with hand-held mobile terminal by wireless communication mode.This detection method comprises following steps: gather the electric current and the voltage signal of voltage transformer secondary side, and carry out corresponding signal process, conversion; Electric current, voltage signal that little current sampling circuit and voltage sample circuit will be gathered and handle are transferred to Single Chip Microcomputer (SCM) system; Single Chip Microcomputer (SCM) system is by analysis and calculate secondary load and whole electric parameters, and is transferred to hand-held mobile terminal.This pick-up unit and method help quickly and accurately the PT secondary load being carried out on-line measurement.
Description
Technical field
The present invention relates to the electric signal technical field of measurement and test, particularly a kind of PT charge on-line detection device and detection method.
Background technology
Along with China Power moves towards market, the accuracy of electric energy metrical comes into one's own day by day, and the error of voltage transformer (VT) (PT) is to influence an accurately key factor of metering of electric energy.Theoretical analysis shows: the error of PT is directly proportional with its secondary load.Traditional transformer error method of testing generally is under nominal load PT to be detected, and can not truly be reflected in the actual error value under the actual load ruuning situation.In order to guarantee the accurate operation of PT, the load of PT is within the specified upper lower limit value scope of regulation.Because the PT secondary current is very little, for the actual load test has brought certain difficulty, in addition, must be in test to system blackout, and need just to finish by means of current source, voltage source, mutual-inductor tester etc. the secondary actual load test of PT, experimentation complexity, test duration are long.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of PT charge on-line detection device and detection method are provided, this pick-up unit and method help quickly and accurately the PT secondary load being carried out on-line measurement.
For realizing above-mentioned purpose, technical scheme of the present invention is: this PT charge on-line detection device, comprise little current sampling circuit, voltage sample circuit, Single Chip Microcomputer (SCM) system and hand-held mobile terminal, described little current sampling circuit comprises forcipated mutual-inductor, zero flux compensation circuit, signal amplification circuit and AD analog to digital conversion circuit, described forcipated mutual-inductor is connected with voltage transformer secondary side, to gather the secondary side current signal and to carry out corresponding signal process, described voltage sample circuit comprises pincerlike voltage folder, signal processing circuit and AD analog to digital conversion circuit, described pincerlike voltage folder is connected with voltage transformer secondary side, to gather the secondary side voltage signal and to carry out corresponding signal process; Described little current sampling circuit, voltage sample circuit are connected with Single Chip Microcomputer (SCM) system respectively, be transferred to Single Chip Microcomputer (SCM) system with electric current, the voltage signal that will gather and handle, and the control command of accepting to pass under the Single Chip Microcomputer (SCM) system, described Single Chip Microcomputer (SCM) system is connected with hand-held mobile terminal by wireless communication mode.
This PT load online test method is carried out the online detection of PT load by the cooperating of little current sampling circuit, voltage sample circuit, Single Chip Microcomputer (SCM) system and hand-held mobile terminal, and this method comprises following steps:
(1) gathers the current signal of voltage transformer secondary side by the forcipated mutual-inductor of little current sampling circuit, and carry out corresponding signal process, conversion; Pincerlike voltage folder by voltage sample circuit is gathered the voltage signal of voltage transformer secondary side, and carries out corresponding signal process, conversion;
(2) little current sampling circuit and voltage sample circuit electric current, the voltage signal that will gather and handle is transferred to Single Chip Microcomputer (SCM) system;
(3) Single Chip Microcomputer (SCM) system is according to the electric current that receives, voltage, electric current, phase place and the frequency that the voltage signal analysis obtains voltage transformer secondary side, and active power, reactive power, applied power and power factor (PF) by calculating secondary side.
(4) Single Chip Microcomputer (SCM) system is transferred to hand-held mobile terminal with PT secondary load and whole electric parameter, and shows on hand-held mobile terminal.
Distinguishing feature of the present invention is to finish the on-line measurement of PT secondary load, and test speed is fast, accuracy is high, for on-the-spot test has brought very big convenience.Simultaneously, adopt bluetooth communication mode and PDA to carry out data interaction, safety easy to use and test data can be preserved.The present invention is except can testing the PT secondary load, can also test whole electric parameters (voltage, electric current, phase place, frequency, meritorious, idle, applied power, power factor (PF) etc.), therefore can replace pincerlike phase meter of high precision and single-phase electric parameter measurement instrument to use again.
The present invention is described in further detail below in conjunction with drawings and the specific embodiments.
Description of drawings
Fig. 1 is the theory diagram of the embodiment of the invention.
Fig. 2 is the hardware principle block diagram of little current sampling circuit of the embodiment of the invention.
Fig. 3 is the hardware principle block diagram of the voltage sample circuit of the embodiment of the invention.
Fig. 4 is that the Single Chip Microcomputer (SCM) system of the embodiment of the invention is carried out the software control flow chart that PT voltage, PT current channel phase alignment and electric parameter are gathered computing.
Embodiment
PT charge on-line detection device of the present invention comprises little current sampling circuit, voltage sample circuit, Single Chip Microcomputer (SCM) system and hand-held mobile terminal as shown in Figure 1.Shown in Fig. 2,3, described little current sampling circuit comprises forcipated mutual-inductor, zero flux compensation circuit, signal amplification circuit and AD analog to digital conversion circuit, described forcipated mutual-inductor is connected with voltage transformer secondary side, to gather the secondary side current signal and to carry out corresponding signal process, described voltage sample circuit comprises pincerlike voltage folder, signal processing circuit and AD analog to digital conversion circuit, described pincerlike voltage folder is connected with voltage transformer secondary side, to gather the secondary side voltage signal and to carry out corresponding signal process.Described little current sampling circuit, voltage sample circuit are connected with Single Chip Microcomputer (SCM) system respectively, be transferred to Single Chip Microcomputer (SCM) system with electric current, the voltage signal that will gather and handle, and the control command of accepting to pass under the Single Chip Microcomputer (SCM) system, wherein the switching of current range is all finished under Single-chip Controlling automatically.Described Single Chip Microcomputer (SCM) system is mutual by be connected with the hand-held mobile terminal line data of going forward side by side of bluetooth communication mode.
The PT load online test method of this pick-up unit correspondence is carried out the online detection of PT load by the cooperating of little current sampling circuit, voltage sample circuit, Single Chip Microcomputer (SCM) system and hand-held mobile terminal, and this method comprises following steps:
(1) gathers the current signal of voltage transformer secondary side by the forcipated mutual-inductor of little current sampling circuit, and carry out corresponding signal process, conversion; Pincerlike voltage folder by voltage sample circuit is gathered the voltage signal of voltage transformer secondary side, and carries out corresponding signal process, conversion;
(2) little current sampling circuit and voltage sample circuit electric current, the voltage signal that will gather and handle is transferred to Single Chip Microcomputer (SCM) system;
(3) Single Chip Microcomputer (SCM) system is according to the electric current that receives, voltage, electric current, phase place and the frequency that the voltage signal analysis obtains voltage transformer secondary side, and active power, reactive power, applied power and power factor (PF) by calculating secondary side.
(4) Single Chip Microcomputer (SCM) system is transferred to hand-held mobile terminal with PT secondary load and whole electric parameter, and shows on hand-held mobile terminal.
In order accurately to detect PT load active power, adopt scm software control PT voltage, PT current channel phase alignment, electric parameter to gather computing, the software control procedure block diagram is shown in 4.
More than be preferred embodiment of the present invention, all changes of doing according to technical solution of the present invention when the function that is produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (3)
1. PT charge on-line detection device, it is characterized in that: comprise little current sampling circuit, voltage sample circuit, Single Chip Microcomputer (SCM) system and hand-held mobile terminal, described little current sampling circuit comprises forcipated mutual-inductor, zero flux compensation circuit, signal amplification circuit and AD analog to digital conversion circuit, described forcipated mutual-inductor is connected with voltage transformer secondary side, to gather the secondary side current signal and to carry out corresponding signal process, described voltage sample circuit comprises pincerlike voltage transformer (VT), signal processing circuit and AD analog to digital conversion circuit, described pincerlike voltage folder is connected with voltage transformer secondary side, to gather the secondary side voltage signal and to carry out corresponding signal process; Described little current sampling circuit, voltage sample circuit are connected with Single Chip Microcomputer (SCM) system respectively, are transferred to Single Chip Microcomputer (SCM) system with electric current, the voltage signal that will gather and handle, and described Single Chip Microcomputer (SCM) system is connected with hand-held mobile terminal by wireless communication mode.
2. PT charge on-line detection device according to claim 1 is characterized in that: described Single Chip Microcomputer (SCM) system is mutual by be connected with the hand-held mobile terminal line data of going forward side by side of bluetooth communication mode.
3. PT load online test method is characterized in that: carry out the online detection of PT load by the cooperating of little current sampling circuit, voltage sample circuit, Single Chip Microcomputer (SCM) system and hand-held mobile terminal, comprise following steps:
(1) gathers the current signal of voltage transformer secondary side by the forcipated mutual-inductor of little current sampling circuit, and carry out corresponding signal process, conversion; Pincerlike voltage folder by voltage sample circuit is gathered the voltage signal of voltage transformer secondary side, and carries out corresponding signal process, conversion;
(2) little current sampling circuit and voltage sample circuit electric current, the voltage signal that will gather and handle is transferred to Single Chip Microcomputer (SCM) system;
(3) Single Chip Microcomputer (SCM) system is according to the electric current that receives, voltage, electric current, phase place and the frequency that the voltage signal analysis obtains voltage transformer secondary side, and active power, reactive power, applied power and power factor (PF) by calculating secondary side.
(4) Single Chip Microcomputer (SCM) system is transferred to hand-held mobile terminal with PT secondary load and whole electric parameter, and shows on hand-held mobile terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009103036659A CN101609135A (en) | 2009-06-25 | 2009-06-25 | PT charge on-line detection device and detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009103036659A CN101609135A (en) | 2009-06-25 | 2009-06-25 | PT charge on-line detection device and detection method |
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| CN101609135A true CN101609135A (en) | 2009-12-23 |
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| CNA2009103036659A Pending CN101609135A (en) | 2009-06-25 | 2009-06-25 | PT charge on-line detection device and detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941215A (en) * | 2014-05-15 | 2014-07-23 | 李峰 | Filed detector for voltage transformer |
| CN110531150A (en) * | 2019-09-10 | 2019-12-03 | 浙江蓝迪电力科技有限公司 | A kind of Road test system and method |
-
2009
- 2009-06-25 CN CNA2009103036659A patent/CN101609135A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941215A (en) * | 2014-05-15 | 2014-07-23 | 李峰 | Filed detector for voltage transformer |
| CN103941215B (en) * | 2014-05-15 | 2016-04-13 | 国家电网公司 | A kind of voltage transformer (VT) site inspection instrument |
| CN110531150A (en) * | 2019-09-10 | 2019-12-03 | 浙江蓝迪电力科技有限公司 | A kind of Road test system and method |
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Application publication date: 20091223 |