CN102486507A - Direct current leakage measurement device - Google Patents
Direct current leakage measurement device Download PDFInfo
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- CN102486507A CN102486507A CN2010105808986A CN201010580898A CN102486507A CN 102486507 A CN102486507 A CN 102486507A CN 2010105808986 A CN2010105808986 A CN 2010105808986A CN 201010580898 A CN201010580898 A CN 201010580898A CN 102486507 A CN102486507 A CN 102486507A
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- direct current
- leakage sensor
- circuit breaker
- mutual inductor
- isolating switch
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Abstract
The invention discloses a direct current leakage measurement device, which consists of a small modular direct current circuit breaker and a direct current leakage sensor, wherein the small modular direct current circuit breaker is a positive and negative electrode direct current circuit breaker capable of breaking a positive electrode power supply and a negative electrode power supply, and is provided with an overload protection releasing instrument or a short circuit protection releasing instrument; the direct current leakage sensor consists of a shell, a mutual inductor and an electronic component board for detecting leakage current; two conductors pass through the mutual inductor; the polarities of direct current flowing through the two conductors are opposite; the output of the mutual inductor is connected with the input of the electronic component board; and the direct current leakage sensor is arranged at the wire inlet end or the wire outlet end of the small modular direct current circuit breaker, and is independent to the small modular circuit breaker or integrated with the small modular circuit breaker. During mounting or maintenance, the direct current leakage sensor and the small modular direct current circuit breaker can be mounted or maintained together; and the direct current leakage measurement device has the advantages of simplicity in mounting, convenience for maintenance and the like.
Description
Technical field
The present invention relates to the DC leakage current measurement mechanism, belong to direct current IT system insulating monitoring field and direct current earth leakage protection field.
Background technology
The insulated on-line monitoring of straight-flow system generally can be divided into two parts, and promptly ground connection is detected and earthing wire-selecting.Ground connection detection is through the calculating to straight-flow system positive and negative busbar resistance to earth, in time finds insulation decline fault, and earthing wire-selecting then is used for confirming the branch road that insulation descends takes place, and avoids blindly operating a switch outage, dwindles fault coverage.The realization of earthing wire-selecting; General through two kinds of methods realizations; One of which is the signal tracing method, and the low frequency signal source that adds is injected straight-flow system, and the branch road that this low frequency signal occurs is fault branch; And, confirm this branch road insulating resistance value in the loop through the amplitude that this signal is produced and the analysis of phase change; It two is the leakage current method, through the switching of electric bridge, makes the branch road both positive and negative polarity size of current that earth fault takes place unequal, and the both positive and negative polarity difference between currents is leakage current, calculates this branch road insulating resistance value through detecting leakage current value and both positive and negative polarity voltage-to-ground value.
Fig. 1 is typical D.C. isolation monitoring system arrangement plan, and wherein, KM+, KM-are respectively the positive and negative busbar of straight-flow system, and GND is a earth, and K1～Kn is the isolating switch of protection branch road, and CT1～CTn is the direct current electricity leakage sensor.After insulation decline fault took place, insulation monitoring and warning device carried out earthing wire-selecting through the leakage current value of gathering CT1～CTn.
Present existing direct current electricity leakage sensor like Fig. 2, generally adopts independently mounting means, and promptly electricity leakage sensor is installed on the leading-out terminal of isolating switch through screw or guide rail, and electricity leakage sensor current supply circuit and order circuit are all drawn from the D.C. isolation monitoring device.Because be stand alone type, loaded down with trivial details, shortcoming such as easy care not is installed so this direct current electricity leakage sensor generally exists.
Summary of the invention
The purpose of this invention is to provide a kind of electricity leakage sensor with new structure, it can overcome existing electricity leakage sensor install loaded down with trivial details, shortcoming such as easy care not.
Technical solution of the present invention is:
A kind of DC leakage current measurement mechanism is made up of modularization small-sized DC isolating switch and direct current electricity leakage sensor, wherein:
Described modularization small-sized DC isolating switch is positive and negative two utmost point dc circuit breakers of ability disjunction cathode power supply and negative power supply, and it has overload protection electrical apparatus release or short-circuit protection electrical apparatus release;
Described direct current electricity leakage sensor is made up of the electric sub-member plate of housing, mutual inductor, detection leakage current, passes two conductors in the mutual inductor, and the DC current polarity that flows through two conductors is opposite, and the output of mutual inductor connects the input of electric sub-member plate;
Described direct current electricity leakage sensor is established end of incoming cables or the leading-out terminal of arm in modularization small-sized DC isolating switch.
Described modularization small-sized DC isolating switch and direct current electricity leakage sensor can be splits, also process one.
Compared with prior art, adopt direct current electricity leakage sensor of the present invention, when installing or safeguarding, can electricity leakage sensor installed with modularization small-sized DC isolating switch or safeguards, have simple installation, advantage such as easy to maintenance.
Description of drawings
Fig. 1 is typical D.C. isolation monitoring system arrangement plan;
Fig. 2 is present existing direct current electricity leakage sensor;
Fig. 3 is a technical solution technical schematic diagram of the present invention;
Fig. 4 is direct current electricity leakage sensor and isolating switch assembling stereogram in the embodiment 1 of the present invention;
Fig. 5 is direct current electricity leakage sensor stereographic map in the embodiment 1 of the present invention;
Fig. 6 is direct current electricity leakage sensor exploded view in the embodiment 1 of the present invention;
Fig. 7 is direct current electricity leakage sensor and isolating switch assembling stereogram in the embodiment 2 of the present invention;
Fig. 8 is direct current electricity leakage sensor stereographic map in the embodiment 2 of the present invention;
Fig. 9 is direct current electricity leakage sensor exploded view in the embodiment 2 of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Fig. 3 is a technical solution schematic diagram of the present invention, and the direct supply both positive and negative polarity is inserted by modularization miniature circuit breaker 5, is connected to load through direct current electricity leakage sensor 6; Direct current electricity leakage sensor 6 is made up of the electric sub-member plate 3 of housing 4, mutual inductor 1 and detection leakage current; Pass two dc wires 22 (positive pole and negative pole) in the mutual inductor 1 simultaneously; Medelling miniature circuit breaker 5 structurally can be whole with DC leakage current sensor 6, also can be split.
Embodiment 1:
Like Fig. 4, Fig. 5, shown in Figure 6, electricity leakage sensor of the present invention comprises mutual inductor 1, main circuit connection combination 2, electric sub-member plate 3, shell 4.Wherein:
Main circuit connection combination 2 comprises lug plate 21, copper conductor 22, connection terminal combination 23 and stator 24, and lug plate 21, stator 24 are fixed together with shell 4, and as the critical piece that connects isolating switch 25 (Fig. 3).Wherein, Lug plate 21 is used for and being electrically connected of modularization small-sized DC isolating switch 25; Stator 24 is used for the mechanical connection with modularization small-sized DC isolating switch 25, and lug plate 21 inserts in the connection terminal of isolating switch with stator 24 simultaneously, and is fastening with the screw of breaker connection terminal.Article two, copper conductor 22 passes mutual inductor 1, and is connected with load after connection terminal combination 23 links to each other again, and these two leads are the lead of this road electric, and connection terminal makes up 23 and is mainly used in the wiring of direct current electricity leakage sensor.
The Secondary Winding of mutual inductor 1 links to each other with electric sub-member plate 3.
The electronic circuit board 31 of electric sub-member plate 3 is exported change calculations DC leakage current value through the secondary that detects mutual inductor 1, and is connected with external unit through connection terminal 32.
Shell 4 mainly comprises right casing 41, middle shell 42, left shell 44, rivet 43 and label 45, and right casing 41, middle shell 42, left shell 44 be through rivet 43 riveted joints, label 45 be pasted on rivet shell directly over.
Embodiment 2:
Like Fig. 7, Fig. 8, shown in Figure 9, electricity leakage sensor of the present invention comprises mutual inductor 1, main circuit connection combination 2, electric sub-member plate 3, shell 4.Wherein:
Main circuit connection combination 2 comprises lug plate 21, copper conductor 22, connection terminal combination 23 and stator 24; Lug plate 21, stator 24 are fixed together with shell 4; And as the critical piece that connects isolating switch 5, two copper conductors 22 pass mutual inductor 1, link to each other with connection terminal combination 23; The DC current polarity that flows through two copper conductors 22 is opposite, and connection terminal combination 23 is mainly used in the wiring of direct current electricity leakage sensor.
The Secondary Winding of mutual inductor 1 links to each other with electric sub-member plate 3.
The electronic circuit board 31 of electric sub-member plate 3, electronic circuit board 32 are exported change calculations DC leakage current value through the secondary that detects mutual inductor 1, and are connected with external unit through connection terminal 33.
Shell 4 mainly comprises right casing 41, middle shell 42, left shell 44, rivet 43 and label 45, and right casing 41, middle shell 42, left shell 44 be through rivet 43 riveted joints, label 45 be pasted on rivet shell directly over.
Different is with embodiment 1, and present embodiment has leakage current or insulation resistance Presentation Function on the spot, can reflect the leakage current value or the insulating resistance value of this branch road now.
Claims (3)
1. a DC leakage current measurement mechanism is made up of modularization small-sized DC isolating switch and direct current electricity leakage sensor, it is characterized in that:
Described modularization small-sized DC isolating switch is positive and negative two utmost point dc circuit breakers of ability disjunction cathode power supply and negative power supply, and it has overload protection electrical apparatus release or short-circuit protection electrical apparatus release;
Described direct current electricity leakage sensor is made up of the electric sub-member plate of housing, mutual inductor, detection leakage current, passes two conductors in the mutual inductor, and the DC current polarity that flows through two conductors is opposite, and the output of mutual inductor connects the input of electric sub-member plate;
Described direct current electricity leakage sensor is arranged at the end of incoming cables or the leading-out terminal of modularization small-sized DC isolating switch.
2. DC leakage current measurement mechanism as claimed in claim 1 is characterized in that:
Described modularization small-sized DC isolating switch and direct current electricity leakage sensor are splits.
3. DC leakage current measurement mechanism as claimed in claim 1 is characterized in that
Described modularization small-sized DC isolating switch and direct current electricity leakage sensor are processed one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105808986A CN102486507A (en) | 2010-12-03 | 2010-12-03 | Direct current leakage measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105808986A CN102486507A (en) | 2010-12-03 | 2010-12-03 | Direct current leakage measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102486507A true CN102486507A (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105808986A Pending CN102486507A (en) | 2010-12-03 | 2010-12-03 | Direct current leakage measurement device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2894400B2 (en) * | 1992-06-09 | 1999-05-24 | 三菱電機株式会社 | Earth leakage breaker |
| CN2513222Y (en) * | 2001-12-25 | 2002-09-25 | 陈酌升 | Combined leakage protection controller |
| CN2549477Y (en) * | 2002-05-10 | 2003-05-07 | 甘肃省电力公司 | DC system ground fault tester |
| CN101281837A (en) * | 2007-04-05 | 2008-10-08 | 浙江正泰电器股份有限公司 | Modularization aftercurrent actuating protector |
| CN201408722Y (en) * | 2009-05-07 | 2010-02-17 | 李文俊 | Ultra-small dual-line circuit breaker with width of 18 mm |
| CN101738568A (en) * | 2008-11-21 | 2010-06-16 | 山东惠工仪器有限公司 | Distributed DC ground fault detector |
| CN201886106U (en) * | 2010-12-03 | 2011-06-29 | 北京人民电器厂有限公司 | Direct current leakage current measuring device |
-
2010
- 2010-12-03 CN CN2010105808986A patent/CN102486507A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2894400B2 (en) * | 1992-06-09 | 1999-05-24 | 三菱電機株式会社 | Earth leakage breaker |
| CN2513222Y (en) * | 2001-12-25 | 2002-09-25 | 陈酌升 | Combined leakage protection controller |
| CN2549477Y (en) * | 2002-05-10 | 2003-05-07 | 甘肃省电力公司 | DC system ground fault tester |
| CN101281837A (en) * | 2007-04-05 | 2008-10-08 | 浙江正泰电器股份有限公司 | Modularization aftercurrent actuating protector |
| CN101738568A (en) * | 2008-11-21 | 2010-06-16 | 山东惠工仪器有限公司 | Distributed DC ground fault detector |
| CN201408722Y (en) * | 2009-05-07 | 2010-02-17 | 李文俊 | Ultra-small dual-line circuit breaker with width of 18 mm |
| CN201886106U (en) * | 2010-12-03 | 2011-06-29 | 北京人民电器厂有限公司 | Direct current leakage current measuring device |
Non-Patent Citations (1)
| Title |
|---|
| 武一等: "基于单片机的漏电保护智能化技术", 《低压电器》 * |
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Application publication date: 20120606 |