CN101968523A - Direct-current system loop and insulating fault diagnosis method - Google Patents
Direct-current system loop and insulating fault diagnosis method Download PDFInfo
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- CN101968523A CN101968523A CN 201010297555 CN201010297555A CN101968523A CN 101968523 A CN101968523 A CN 101968523A CN 201010297555 CN201010297555 CN 201010297555 CN 201010297555 A CN201010297555 A CN 201010297555A CN 101968523 A CN101968523 A CN 101968523A
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Abstract
The invention discloses a direct-current system loop and an insulating fault diagnosis method. A main controller performs loop matching on current information of each loop according to the loop characteristics, determines loop information through loop indexes, and can calculate loop grounding impedance according to a loop grounding leakage current and a bus voltage. The method can sample current information of a direct-current system in real time and judge and predict the grounding trend of the direct-current system, and provides a scientific and effective detection means for avoiding protection maloperation due to current grounding. The direct-current system loop and the insulating fault diagnosis method are widely applied in power detection and relay protection systems.
Description
Technical field
The present invention relates to a kind of diagnostic method, particularly a kind of to straight-flow system loop and insulation fault diagnostic method thereof.
Background technology
Traditional direct current system online insulated detection method can be divided into two kinds of active and passive types.Actively need inject specific signal, survey this signal by sensor then and judge whether to exist ground loop to system.Passive type does not need to inject any signal to system, directly detects the leakage current in each loop and whether judges ground connection.Passive type detects with its security, has represented the developing direction of straight-flow system monitoring device, along with the continuous progress of modern microelectric technique, will become the main flow in market.Yet ubiquitous dc loop circuit in the straight-flow system brings great interference for the location of earth fault.Because dc loop circuit exists, the key point of carrying out loop insulation detection is to find out earlier the branch road that constitutes dc loop circuit from each direct current branch, i.e. the loop coupling.
Summary of the invention
In order to solve above-mentioned technical matters, the purpose of this invention is to provide a kind of efficient, real-time, comprehensive straight-flow system loop and insulation fault diagnostic method.
The technical scheme that the present invention is adopted for its technical matters of solution is:
Straight-flow system loop and insulation fault diagnostic method may further comprise the steps:
A. master controller system initialization;
B. data acquisition unit and master controller establish a communications link;
C. direct current transducer is gathered each loop current;
D. data acquisition unit is classified to the loop according to current characteristics;
E. master controller carries out the loop matching operation according to the loop feature to each loop;
F. master controller adds up loop index according to the loop matching result;
G. master controller filters out loop and loop information is shown.
Be further used as preferred embodiment, described step G master controller is according to loop or loop earth leakage stream and busbar voltage, calculate each loop or loop impedance ground, when impedance ground is lower than system insulation impedance requirement, open acoustic-optic alarm, and ground loop information is shown by the display screen that links to each other with master controller.
The invention has the beneficial effects as follows: the problem that the invention solves straight-flow system intermediate ring road coupling, avoided in the straight-flow system ubiquitous dc loop circuit to bring interference for the location of earth fault, the loop ground connection detection that exists for straight-flow system provides science detection method easily, can effectively guarantee the security of straight-flow system operation.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is the hardware structure diagram of the inventive method.
Embodiment
A kind of straight-flow system loop and insulation fault diagnostic method, its hardware configuration comprises master controller 1, data acquisition unit 2 and direct current transducer 3, described master controller links to each other with data acquisition unit 2 by bus 4, and described data acquisition unit 2 is connected with direct current transducer 3 by interface, may further comprise the steps:
A. master controller 1 system initialization comprises initialization data, loads configuration information, historical record and reference current value from eeprom, storage configuration information, historical record and reference current value;
B. data acquisition unit 2 establishes a communications link with master controller 1, and each data acquisition unit 2 subsystem all has the corresponding codes address, primary controller 1 power on and operational process in each subsystem is detected, judge whether subsystem inserts and set up correspondence;
C. 3 pairs of each loop currents of direct current transducer are gathered;
D. data acquisition unit 2 is classified to the loop according to current characteristics;
E. master controller 1 carries out the loop matching operation according to the loop feature to each loop, and the loop feature is that loop input current sum equals loop output current sum;
F. master controller 1 adds up loop index according to the loop matching result;
G. master controller 1 filters out loop and loop information is shown.
Be further used as preferred embodiment, described step G master controller 1 is according to loop or loop earth leakage stream and busbar voltage, calculate each loop or loop impedance ground, when impedance ground is lower than system insulation impedance requirement, open acoustic-optic alarm, and ground loop information is shown by the display screen 11 that links to each other with master controller 1.
More than be that preferable enforcement of the present invention is specified, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of spirit of the present invention, distortion that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (2)
1. straight-flow system loop and insulation fault diagnostic method is characterized in that: may further comprise the steps:
A. master controller (1) system initialization;
B. data acquisition unit (2) establishes a communications link with master controller (1);
C. direct current transducer (3) is gathered each loop current;
D. data acquisition unit (2) is classified to the loop according to current characteristics;
E. master controller (1) carries out the loop matching operation according to the loop feature to each loop;
F. master controller (1) adds up loop index according to the loop matching result;
G. master controller (1) filters out loop and loop information is shown.
2. straight-flow system loop according to claim 1 and insulation fault diagnostic method, it is characterized in that: described step G master controller (1) is according to loop or loop earth leakage stream and busbar voltage, calculate each loop or loop impedance ground, when impedance ground is lower than system insulation impedance requirement, open acoustic-optic alarm, and ground loop information is shown by the display screen (11) that links to each other with master controller (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010297555 CN101968523A (en) | 2010-09-30 | 2010-09-30 | Direct-current system loop and insulating fault diagnosis method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010297555 CN101968523A (en) | 2010-09-30 | 2010-09-30 | Direct-current system loop and insulating fault diagnosis method |
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| Publication Number | Publication Date |
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| CN101968523A true CN101968523A (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010297555 Pending CN101968523A (en) | 2010-09-30 | 2010-09-30 | Direct-current system loop and insulating fault diagnosis method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590676A (en) * | 2012-02-28 | 2012-07-18 | 北京人民电器厂有限公司 | Device and method for detecting fault of direct current looped network of direct current power supply system |
| CN112066516A (en) * | 2020-08-03 | 2020-12-11 | 珠海格力电器股份有限公司 | Air conditioner, fault self-diagnosis method, external unit positioning fault method and remote controller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033880A (en) * | 1987-12-07 | 1989-07-12 | 南加利福尼亚爱迪生公司 | Fault detect |
| CN2750617Y (en) * | 2004-11-15 | 2006-01-04 | 李成友 | Intelligent controller for whole network electrified periphery-blocking security protection electric network |
| CN201449432U (en) * | 2009-01-09 | 2010-05-05 | 王道龙 | On-line insulation detection device for DC system |
-
2010
- 2010-09-30 CN CN 201010297555 patent/CN101968523A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033880A (en) * | 1987-12-07 | 1989-07-12 | 南加利福尼亚爱迪生公司 | Fault detect |
| CN2750617Y (en) * | 2004-11-15 | 2006-01-04 | 李成友 | Intelligent controller for whole network electrified periphery-blocking security protection electric network |
| CN201449432U (en) * | 2009-01-09 | 2010-05-05 | 王道龙 | On-line insulation detection device for DC system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590676A (en) * | 2012-02-28 | 2012-07-18 | 北京人民电器厂有限公司 | Device and method for detecting fault of direct current looped network of direct current power supply system |
| CN102590676B (en) * | 2012-02-28 | 2014-08-13 | 北京人民电器厂有限公司 | Device and method for detecting fault of direct current looped network of direct current power supply system |
| CN112066516A (en) * | 2020-08-03 | 2020-12-11 | 珠海格力电器股份有限公司 | Air conditioner, fault self-diagnosis method, external unit positioning fault method and remote controller |
| CN112066516B (en) * | 2020-08-03 | 2021-08-20 | 珠海格力电器股份有限公司 | Air conditioner, fault self-diagnosis method, external unit positioning fault method and remote controller |
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Application publication date: 20110209 |