CN110095682A - A kind of CT wire break detection method suitable for formula power electronic equipment can be presented - Google Patents
A kind of CT wire break detection method suitable for formula power electronic equipment can be presented Download PDFInfo
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- CN110095682A CN110095682A CN201910447223.5A CN201910447223A CN110095682A CN 110095682 A CN110095682 A CN 110095682A CN 201910447223 A CN201910447223 A CN 201910447223A CN 110095682 A CN110095682 A CN 110095682A
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- mutual inductor
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- output current
- converter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Protection Of Static Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The CT wire break detection method that the invention discloses a kind of suitable for that can present formula power electronic equipment, the formula power electronic equipment that can present is made of power network current sampling mutual inductor CT2, output current of converter sampling mutual inductor CT1, current transformer and the controller for being mounted on grid side, current transformer side and grid side are respectively connected with reactor, HF filtering capacitor is also equipped on power grid, two reactors and HF filtering capacitor form three rank high-frequency filter circuits；After the CT wire break detection method is the following steps are included: device powers on, current transformer open loop is allowed to issue the short pulse that duty ratio is 100%；Then whether detection output current of converter sampling mutual inductor CT1 has electric current: if output current of converter samples mutual inductor CT1 and can detect electric current, output current of converter sampling mutual inductor CT1 can be determined that it is complete after open loop exports short pulse；If it is not, determining the failure of output current of converter sampling mutual inductor CT1 damage and broken string.
Description
Technical field
The CT wire break detection method that the present invention relates to a kind of suitable for that can present formula power electronic equipment.
Background technique
With the development of power electronics technology and the processing capacity of microprocessor increases step enhancing, and computer is controlled in real time
Technology processed, various advanced algorithms are constantly used in electronic power convertor device.
Formula electronic power convertor device can be presented due to being applied in electric system detection platform, be capable of providing a variety of
Active and reactive, harmonic wave complex conditions need so there are voltage, current sensor in two end of head and the tail for grid-connected stabilization
Sampled voltage, current signal are wanted in the voltage fluctuation that actually follow grid entry point, form closed loop feedback control.
Net side CT sampling be it is indispensable, the position and no-load voltage ratio that the usual CT should connect all are manually to be configured
And confirmation, also will do it overload etc. sometimes has destructive testing, since it is as important composition in testing inspection class platform
Part, reliability, trackability, the requirement of controllability are high, and the reliability sampled in production process, transportational process should have
There is higher intelligent testing technology.
Since platform is a complicated integrated system, the complete health status concerning platform entirety of core component, through examining
There are no relatively good solutions on the market at present for rope.
Summary of the invention
In view of the deficiencies of the prior art, the CT that the present invention provides a kind of suitable for that can present formula power electronic equipment, which breaks, to be examined
Survey method carries out the circuit of closed-loop control suitable for any power electronics using CT.
To achieve the above object, the invention provides the following technical scheme: it is a kind of suitable for formula power electronic equipment can be presented
CT wire break detection method, the formula power electronic equipment that can present is by being mounted on the power network current sampling mutual inductor CT2 of grid side, becoming
Device output current sampling mutual inductor CT1, current transformer and controller is flowed to constitute, current transformer side and grid side are respectively connected with reactor,
HF filtering capacitor is also equipped on power grid, two reactors and HF filtering capacitor form three rank high-frequency filter circuits；
After the CT wire break detection method is the following steps are included: device powers on, allow current transformer open loop to issue duty ratio to be
100% short pulse；Then whether detection output current of converter sampling mutual inductor CT1 has electric current:
If output current of converter, which samples mutual inductor CT1, can detect electric current after open loop exports short pulse, become
Stream device output current sampling mutual inductor CT1 can be determined that it is complete；If it is not, determining that output current of converter sampling is mutual
The failure of sensor CT1 damage and broken string.
Further, it before issuing short pulse, first detects power network current and samples mutual inductor CT2, if being sampled in power network current
Mutual inductor CT2 detects electric current, then can directly detect whether output current of converter sampling mutual inductor CT1 has electric current, sentences
Whether disconnected output current of converter sampling mutual inductor CT1 is normal；If can't detect electric current in power network current sampling mutual inductor CT2,
Power network current sampling mutual inductor CT2 is failure first, then current transformer open loop is allowed to issue the short pulse that duty ratio is 100%.
Beneficial effects of the present invention: a kind of direct CT wire break detection method is provided, automatic detection is easy to implement, in device
After powering on, controller passes through can carry out CT burn out detection automatically, and selftest can be carried out before each electrifying startup of device,
To reach oneself irregular physical examination, greatly improve the reliability of device.
Detailed description of the invention
Fig. 1 is the system structure diagram that can present formula power electronic equipment of the invention.
Specific embodiment
As shown in Figure 1, a kind of CT wire break detection method suitable for that can present formula power electronic equipment, described to present formula electric power
Electronic device samples mutual inductor CT2 by the power network current for being mounted on grid side, output current of converter sampling mutual inductor CT1, becomes
It flowing device and controller is constituted, current transformer side and grid side are respectively connected with reactor, it is also equipped with HF filtering capacitor on power grid,
Two reactors and HF filtering capacitor form three rank high-frequency filter circuits；
After the CT wire break detection method is the following steps are included: device powers on, if in power network current sampling mutual inductor CT2 inspection
Electric current is measured, then can directly detect whether output current of converter sampling mutual inductor CT1 has electric current, judges that current transformer exports
Whether current sampling mutual inductor CT1 is normal；
If can't detect electric current in power network current sampling mutual inductor CT2, judge that power network current sampling mutual inductor CT2 is failure
's；
Then, the short pulse that duty ratio is 100% is issued by current transformer open loop by controller, this short pulse is corresponding to generate one
Fixed current value (due to L1, L2 and C1 be it is set, the value of power grid U1 is standard, so the open hour of short pulse are
Controllable, current value I is accurately I=u*2 π fc)；Then whether detection output current of converter sampling mutual inductor CT1 has electricity
Stream；If output current of converter, which samples mutual inductor CT1, can detect that electric current, current transformer are defeated after open loop exports short pulse
It is complete that current sampling mutual inductor CT1, which can be determined that, out, if it is not, determining the failure of its damage and broken string.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (2)
1. a kind of CT wire break detection method suitable for that can present formula power electronic equipment, the formula power electronic equipment that can present is by pacifying
Mounted in the power network current sampling mutual inductor CT2 of grid side, output current of converter sampling mutual inductor CT1, current transformer and controller
It constitutes, current transformer side and grid side are respectively connected with reactor, and HF filtering capacitor, two reactors and height are also equipped on power grid
Frequency filter condenser forms three rank high-frequency filter circuits；
It is characterized in that, allowing current transformer open loop to issue duty after the CT wire break detection method is the following steps are included: device powers on
Than the short pulse for 100%；Then whether detection output current of converter sampling mutual inductor CT1 has electric current:
If output current of converter, which samples mutual inductor CT1, can detect electric current, current transformer after open loop exports short pulse
Output current sampling mutual inductor CT1 can be determined that it is complete；If it is not, determining that output current of converter samples mutual inductor
The failure of CT1 damage and broken string.
2. a kind of CT wire break detection method suitable for that can present formula power electronic equipment, feature exist according to claim 1
In before issuing short pulse, first detection power network current samples mutual inductor CT2, if detecting in power network current sampling mutual inductor CT2
Electric current judges output current of converter then can directly detect whether output current of converter sampling mutual inductor CT1 has electric current
Whether normal sample mutual inductor CT1；If can't detect electric current in power network current sampling mutual inductor CT2, power network current first is sampled
Mutual inductor CT2 is failure, then current transformer open loop is allowed to issue the short pulse that duty ratio is 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910447223.5A CN110095682A (en) | 2019-05-27 | 2019-05-27 | A kind of CT wire break detection method suitable for formula power electronic equipment can be presented |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910447223.5A CN110095682A (en) | 2019-05-27 | 2019-05-27 | A kind of CT wire break detection method suitable for formula power electronic equipment can be presented |
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| CN110095682A true CN110095682A (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910447223.5A Pending CN110095682A (en) | 2019-05-27 | 2019-05-27 | A kind of CT wire break detection method suitable for formula power electronic equipment can be presented |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201910385U (en) * | 2010-11-25 | 2011-07-27 | 常熟开关制造有限公司(原常熟开关厂） | Intelligent controller for breaker with residual current protection |
| CN104901284A (en) * | 2015-04-16 | 2015-09-09 | 广东电网有限责任公司揭阳供电局 | Detection method and false tripping preventive method of three-phase PT broken line of distance protector |
| US20160223606A1 (en) * | 2014-02-28 | 2016-08-04 | International Business Machines Corporation | Method for the characterization and monitoring of integrated circuits |
| CN106936157A (en) * | 2015-12-30 | 2017-07-07 | 西门子电气传动有限公司 | The control method and control device of grid-connected converter system |
| CN107037309A (en) * | 2017-05-17 | 2017-08-11 | 江苏爱可信电气有限公司 | Residual current transformer broken string method for detecting short circuit |
| CN108535680A (en) * | 2018-03-30 | 2018-09-14 | 上海电机学院 | Residual current transformer fault self-diagnosis system and method |
-
2019
- 2019-05-27 CN CN201910447223.5A patent/CN110095682A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201910385U (en) * | 2010-11-25 | 2011-07-27 | 常熟开关制造有限公司(原常熟开关厂） | Intelligent controller for breaker with residual current protection |
| US20160223606A1 (en) * | 2014-02-28 | 2016-08-04 | International Business Machines Corporation | Method for the characterization and monitoring of integrated circuits |
| CN104901284A (en) * | 2015-04-16 | 2015-09-09 | 广东电网有限责任公司揭阳供电局 | Detection method and false tripping preventive method of three-phase PT broken line of distance protector |
| CN106936157A (en) * | 2015-12-30 | 2017-07-07 | 西门子电气传动有限公司 | The control method and control device of grid-connected converter system |
| CN107037309A (en) * | 2017-05-17 | 2017-08-11 | 江苏爱可信电气有限公司 | Residual current transformer broken string method for detecting short circuit |
| CN108535680A (en) * | 2018-03-30 | 2018-09-14 | 上海电机学院 | Residual current transformer fault self-diagnosis system and method |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190806 |
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| RJ01 | Rejection of invention patent application after publication |