CN201828640U - Direct-detecting intelligent apparatus for diagnosing insulation and status of direct-current (DC) system - Google Patents
Direct-detecting intelligent apparatus for diagnosing insulation and status of direct-current (DC) system Download PDFInfo
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- CN201828640U CN201828640U CN2010205770344U CN201020577034U CN201828640U CN 201828640 U CN201828640 U CN 201828640U CN 2010205770344 U CN2010205770344 U CN 2010205770344U CN 201020577034 U CN201020577034 U CN 201020577034U CN 201828640 U CN201828640 U CN 201828640U
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Abstract
The utility model relates to a direct-detecting intelligent apparatus for diagnosing the insulation and the status of a direct-current (DC) system. The diagnosing apparatus comprises a main diagnostic machine and a handheld split core type current transformer, wherein the main diagnostic machine consists of a signal generator, a power amplifier, a signal injector, a signal receiver, a signal amplifier, an A/D conversion module, a single chip microcomputer system and an alarm; and the general insulation state of a major loop is detected through the alternating-current injection detection mode, and the insulation reduction of a certain branch can be detected through a DC mutual inductor. When simultaneously grounded, a plurality of branches can be simultaneously detected, and the diagnostic accuracy is high. Compared with the equilibrium bridge method and the AC injection method, the diagnosing apparatus which realizes the detection method by using the single chip microcomputer adopts the microcomputer technology, and is characterized by high integration level, high speed of judgment and detection sensitivity, convenient operation, strong capacity of resisting disturbance, accurate fault location, and the like.
Description
Technical field
The utility model relates to power system automatic field, particularly a kind of direct measuring type intelligent DC system insulation and condition diagnosing instrument.
Background technology
110V(or 220V are all adopted in relay protection in the transformer station, control) direct current supply; it is the operation that the DC power-supply system of transformer station is being controlled whole transformer station secondary system; therefore, whether safety directly has influence on the substation operation state to the DC power-supply system state of transformer station.
Transformer station direct current system is with the battery stores energy, and with the charging set makeup energy, Xiang Quanzhan protection, monitoring, communication system be transmission of electric energy endlessly, guarantees its safety, stable, reliability service.Straight-flow system is an insulation system, and just often, positive and negative electrode insulation against ground resistance equates, positive and negative electrode voltage-to-ground balance.When one point earth takes place, the positive and negative electrode voltage-to-ground changes, the earthing pole voltage-to-ground reduces, non-earthing pole voltage raises, in the moment that ground connection is taken place and recovered, may cause auxiliary reclay malfunction tripping operation because of its bigger distributed capacitance through the loop of remote, long cable starting auxiliary reclay tripping operation.
The method that is used to detect the straight-flow system insulation at present mainly contains: balanced bridge method, ac-current inject method.Though the equilibrium principle of dc balance bridge method is used widely, there is following shortcoming: can not detect the situation the when insulation of straight-flow system positive and negative electrode is equal to descend; Even report to the police, can not directly obtain system's insulation resistance size over the ground; Can't directly judge it is which bar branch road takes place by ground connection, have only and to judge it is which bar branch road takes place by ground connection by operating a switch that if there is the branch road insulation resistance more than two to descend, just judging more wastes time and energy; Sensitivity is very low, and detection system itself just has a resistance to earth about 60k.
The feature of ac-current inject method is to need to send on positive and negative busbar low-frequency ac signal.It divides single low-frequency acquisition and frequency conversion to survey (double frequency detection) again, and the insulation detection system that adopts this principle to realize has the following shortcoming that can't overcome: when many branch roads have ground connection simultaneously, can not detect many branch roads simultaneously.
The utility model content
The technical problems to be solved in the utility model has provided a kind of security and high direct measuring type intelligent DC system insulation and the condition diagnosing instrument of reliability, this diagnostic equipment has overcome the technical matters that can't overcome in the above-mentioned prior art, makes that the measurement diagnosis speed is fast, detection sensitivity is high, antijamming capability is strong, localization of fault is accurate.
For solving the problems of the technologies described above, described direct measuring type intelligent DC system insulation and condition diagnosing instrument comprise the diagnosis main frame of mainly being made up of signal generator, power amplifier, signal injector, signal receiver, signal amplifier, A/D modular converter, Single Chip Microcomputer (SCM) system and alarm; The signal generator output terminal of described diagnosis main frame is connected with the major loop of DC power system through power amplifier, signal injector, capacitor C successively, and the output terminal of the major loop of DC power system is connected through the signal receiver of capacitor C with the diagnosis main frame; The signal that signal receiver receives is input in the Single Chip Microcomputer (SCM) system through the processing of signal amplifier, A/D modular converter successively; Single Chip Microcomputer (SCM) system connects the relay switch of alarm; It is characterized in that: also be provided with a hand-held split core type current transformer of mainly being made up of current transformer, power amplifier, rectifier and A/D modular converter, described hand-held split core type current transformer is connected with the input end of Single Chip Microcomputer (SCM) system by RS232; Also be provided with a liquid crystal display on described diagnosis main frame, the output terminal of described Single Chip Microcomputer (SCM) system is connected with the input end of liquid crystal display.
Wherein, on the outside surface of described diagnosis main frame, be provided with display panels, determine key, return key, function key, insulation pilot lamp, voltage indicator lamp, the pilot lamp of crosstalking, exchange pilot lamp and power light.Described diagnosis main frame adopts 220V electric main and two kinds of power supply modes of rechargeable battery.
Compared with prior art, the utlity model has following advantage: the utility model is with a kind of new detection method, being major loop injects detection mode and detects total insulation status with exchanging, and branch road to detect the end with direct current instrument transformer be which insulation occurred and reduces.As many branch roads simultaneously during ground connection, many branch roads that can detect ground connection simultaneously, diagnostic accuracy height.Realize this detection method with single-chip microcomputer simultaneously, compare with ac-current inject method with the balanced bridge method of prior art, the utility model adopts micro-computer technology, has the degree of integration height, judgement speed is fast, the detection sensitivity height, be convenient to operation, characteristics such as antijamming capability is strong, localization of fault is accurate.
Description of drawings
Fig. 1 is the structural representation of the utility model direct measuring type intelligent DC system insulation and condition diagnosing instrument.
Fig. 2 is the block diagram of the utility model direct measuring type intelligent DC system insulation and condition diagnosing instrument.
Among the figure: 1, diagnosis main frame, 2, the hand-held split core type current transformer, 3, display panels, 4, the insulation pilot lamp, 5, voltage indicator lamp, 6, the pilot lamp of crosstalking, 7, exchange pilot lamp, 8, power light, 9, function key, 10, return key, 11, determine key.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
Direct measuring type intelligent DC system insulation as depicted in figs. 1 and 2 and condition diagnosing instrument comprise the diagnosis main frame of mainly being made up of signal generator, power amplifier, signal injector, signal receiver, signal amplifier, A/D modular converter, Single Chip Microcomputer (SCM) system and alarm 1; The signal generator output terminal of described diagnosis main frame 1 is connected with the major loop of DC power system through power amplifier, signal injector, capacitor C successively, and the output terminal of the major loop of DC power system is connected through the signal receiver of capacitor C with diagnosis main frame 1; The signal that signal receiver receives is input in the Single Chip Microcomputer (SCM) system through the processing of signal amplifier, A/D modular converter successively; Single Chip Microcomputer (SCM) system connects the relay switch of alarm; Also be provided with a hand-held split core type current transformer 2 of mainly being made up of current transformer, power amplifier, rectifier and A/D modular converter, described hand-held split core type current transformer 2 is connected with the input end of Single Chip Microcomputer (SCM) system by RS232; Also be provided with a liquid crystal display on described diagnosis main frame 1, the output terminal of described Single Chip Microcomputer (SCM) system is connected with the input end of liquid crystal display.
This device is by the signal projector of being made up of signal generator, power amplifier, signal injector positive pole and low frequency signal that amplitude is less of negative pole emission to the major loop of DC power system, its voltage effective value U " 1%E, E is a busbar voltage, frequency is 20.3Hz, and this signal does not exert an influence to power-supply system.In case insulation degradation, when promptly positive and negative busbar produced leakage current, signal receiver can detect electric leakage signal, and through inputing to Single Chip Microcomputer (SCM) system after amplification, the digital-to-analogue conversion processing, Single Chip Microcomputer (SCM) system is controlled the relay switch of alarm, and alarm begins to report to the police.
When alerting signal, we use that hand-held split core type current transformer 2 aligns, detection is insulated in negative busbar and branch thereof, direct current instrument transformer is handled the back with the signal of its extraction and is delivered to Single Chip Microcomputer (SCM) system by RS232, and Single Chip Microcomputer (SCM) system is delivered to display device with signal and shown.Use hand-held split core type current transformer 2 can find the trouble spot easily and effectively, thereby can get rid of the insulation degradation fault rapidly.
D.C. isolation is just often owing to the opposite resultant flux of electric current equal direction in positive and negative two leads equals zero, when taking place, plus or minus generation one point earth will have electric current to pass through earth point, make the unequal generation difference of the electric current that in direct current instrument transformer, flows to and flow out flow, make and produce magnetic flux in the CT, native system can be realized the high-acruracy survey (I survey 1mA) of DC electric current, resolution is 0.1mA, system adopts the mode of magnetic balance, can not disturb tested circuit, measuring accuracy not to be subjected to the position influence of test line lead.Realization is to the measurement of the small leakage current of DC power-supply system, for the searching of thin spot of insulating provides measuring method easily.
Wherein, on the outside surface of described diagnosis main frame 1, be provided with display panels 3, determine key 11, return key 10, function key 9, insulation pilot lamp 4, voltage indicator lamp 5, the pilot lamp 6 of crosstalking, exchange pilot lamp 7 and power light 8.Described diagnosis main frame 1 adopts 220V electric main and two kinds of power supply modes of rechargeable battery.
More than show and described ultimate principle of the present utility model and principal character and advantage thereof.The technology personage of the industry should understand; the utility model is not subjected to the restriction of above-mentioned implementing regulations; that describes in above-mentioned implementing regulations and the instructions just is used to illustrate principle of the present utility model; under the prerequisite that does not break away from the utility model principle and scope; the utility model also can have various changes and modifications, and these changes and improvements all belong in claimed the utility model scope.
The claimed scope of the utility model defines with appending claims and other equivalent.
Claims (3)
1. direct measuring type intelligent DC system insulation and condition diagnosing instrument comprise the diagnosis main frame of mainly being made up of signal generator, power amplifier, signal injector, signal receiver, signal amplifier, A/D modular converter, Single Chip Microcomputer (SCM) system and alarm (1); The signal generator output terminal of described diagnosis main frame (1) is connected with the major loop of DC power system through power amplifier, signal injector, capacitor C successively, and the output terminal of the major loop of DC power system is connected through the signal receiver of capacitor C with diagnosis main frame (1); The signal that signal receiver receives is input in the Single Chip Microcomputer (SCM) system through the processing of signal amplifier, A/D modular converter successively; Single Chip Microcomputer (SCM) system connects the relay switch of alarm; It is characterized in that: also be provided with a hand-held split core type current transformer (2) of mainly being made up of current transformer, power amplifier, rectifier and A/D modular converter, described hand-held split core type current transformer (2) is connected with the input end of Single Chip Microcomputer (SCM) system by RS232; Also be provided with a liquid crystal display on described diagnosis main frame (1), the output terminal of described Single Chip Microcomputer (SCM) system is connected with the input end of liquid crystal display.
2. direct measuring type intelligent DC system insulation according to claim 1 and condition diagnosing instrument is characterized in that: be provided with display panels (3) on the outside surface of described diagnosis main frame (1), determine key (11), return key (10), function key (9), insulation pilot lamp (4), voltage indicator lamp (5), the pilot lamp of crosstalking (6), exchange pilot lamp (7) and power light (8).
3. direct measuring type intelligent DC system insulation according to claim 1 and condition diagnosing instrument is characterized in that: described diagnosis main frame (1) adopts 220V electric main and two kinds of power supply modes of rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205770344U CN201828640U (en) | 2010-10-26 | 2010-10-26 | Direct-detecting intelligent apparatus for diagnosing insulation and status of direct-current (DC) system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205770344U CN201828640U (en) | 2010-10-26 | 2010-10-26 | Direct-detecting intelligent apparatus for diagnosing insulation and status of direct-current (DC) system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201828640U true CN201828640U (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205770344U Expired - Lifetime CN201828640U (en) | 2010-10-26 | 2010-10-26 | Direct-detecting intelligent apparatus for diagnosing insulation and status of direct-current (DC) system |
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| Country | Link |
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| CN (1) | CN201828640U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004213A (en) * | 2010-10-26 | 2011-04-06 | 上海天晶电力科技发展有限公司 | Direct-detection type intelligent direct-current system insulation and state diagnosis instrument |
| CN104094127A (en) * | 2012-02-29 | 2014-10-08 | 松下电器产业株式会社 | In-vehicle charger |
| CN114167229A (en) * | 2021-11-12 | 2022-03-11 | 广西电网有限责任公司柳州供电局 | Test power supply insulation fault monitoring and searching system and method |
-
2010
- 2010-10-26 CN CN2010205770344U patent/CN201828640U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004213A (en) * | 2010-10-26 | 2011-04-06 | 上海天晶电力科技发展有限公司 | Direct-detection type intelligent direct-current system insulation and state diagnosis instrument |
| CN102004213B (en) * | 2010-10-26 | 2013-03-13 | 上海天晶电力科技发展有限公司 | Direct-detection type intelligent direct-current system insulation and state diagnosis instrument |
| CN104094127A (en) * | 2012-02-29 | 2014-10-08 | 松下电器产业株式会社 | In-vehicle charger |
| US9579978B2 (en) | 2012-02-29 | 2017-02-28 | Panasonic Intellectual Property Management Co., Ltd. | In-vehicle charger |
| CN104094127B (en) * | 2012-02-29 | 2017-04-12 | 松下知识产权经营株式会社 | In-vehicle charger |
| CN114167229A (en) * | 2021-11-12 | 2022-03-11 | 广西电网有限责任公司柳州供电局 | Test power supply insulation fault monitoring and searching system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110511 Effective date of abandoning: 20130313 |
|
| RGAV | Abandon patent right to avoid regrant |