CN105161377A - Direct-current micro circuit breaker and link mechanism for substation direct-current power supply - Google Patents
Direct-current micro circuit breaker and link mechanism for substation direct-current power supply Download PDFInfo
- Publication number
- CN105161377A CN105161377A CN201510619393.9A CN201510619393A CN105161377A CN 105161377 A CN105161377 A CN 105161377A CN 201510619393 A CN201510619393 A CN 201510619393A CN 105161377 A CN105161377 A CN 105161377A
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- Prior art keywords
- circuit breaker
- micro circuit
- current
- iron core
- micro
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/1009—Interconnected mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
The invention provides a direct-current micro circuit breaker for a substation direct-current power supply. The direct-current micro circuit breaker comprises a shell, a lock catch and a bimetallic element, wherein an electromagnetic system comprising a solenoid, a skeleton, a movable iron core, a static iron core, a counterforce spring and an ejector rod is arranged in the shell; one end of the lock catch can be matched with the ejector rod; the bimetallic element is connected with the other end of the lock catch; when current higher than or equal to instantaneous protection current passes, the circuit breaker acts to drive the ejector rod to move towards one side of the lock catch, the lock catch moves from a first position to a second position, and dynamic and static contacts are disengaged; or when fault current passes, the circuit breaker does not act at the first time, the bimetallic element is deformed by heat to pull the lock catch from a first position to a second position, and dynamic and static contacts are disengaged. The instantaneous protection current is set to be 600-800A, so that superior and subordinate circuit breakers in a direct-current power supply system can be selectively protected when the fault current passes, and the direct-current micro circuit breaker can also be quickly broken when the instantaneous protection current passes.
Description
Technical field
The present invention relates to low-voltage electrical apparatus resist technology field, particularly relate to a kind of DC micro circuit breaker for transforming plant DC power supply and link gear.
Background technology
Circuit breaker can be used to distribute electric energy; infrequently start asynchronous motor; protection is carried out to power circuit and motor etc.; can automatic shutdown circuit when serious overload or short circuit and the fault such as under-voltage occur for they; its function is equivalent to Fuse switch and the combination of crossing underheat relay etc., and does not generally need to change parts after disjunction fault current.
At present, DC micro circuit breaker has been widely used in electric power networks, and it can be divided into according to instantaneous protection current system: one, for DC micro circuit breaker that instantaneous protection electric current is under 7-14 times of rated current; Two, for DC micro circuit breaker that instantaneous protection electric current is under 1200A-1680A.
But, above-mentioned two kinds of DC micro circuit breakers all have weak point, and its weak point is: in the first DC micro circuit breaker, when there is 600A-800A short circuit current in transforming plant DC power-supply system, the superior and the subordinate's circuit breaker trips simultaneously, does not have the selective protection function of the superior and the subordinate; In the second DC micro circuit breaker, when fault current is at 600A-800A, this circuit breaker akinesia, causes short trouble to cause accident, and volume is large, and cost is higher.
Therefore, need a kind of DC micro circuit breaker badly, can fault current by time realize selective protection between the superior and the subordinate's circuit breaker in DC power system, also can transient current by time realize himself and disconnect fast.
Summary of the invention
Embodiment of the present invention technical problem to be solved is; a kind of DC micro circuit breaker for transforming plant DC power supply and link gear are provided; its instantaneous protection current settings is in 600A-800A; can fault current by time realize selective protection between the superior and the subordinate's circuit breaker in DC power system, also can instantaneous protection electric current by time realize himself and disconnect fast.
In order to solve the problems of the technologies described above, embodiments provide a kind of DC micro circuit breaker for transforming plant DC power-supply system, described DC micro circuit breaker comprises housing, is provided with in described housing:
One electromagnetic system, described electromagnetic system comprises spiraltron, skeleton, dynamic iron core, static iron core, reaction spring and push rod;
One snap close, can match with the push rod of described electromagnetic system in one end of described snap close;
One bimetallic element, described bimetallic element is connected with the other end of described snap close;
Wherein, when described DC micro circuit breaker have be more than or equal to described instantaneous protection electric current pass through time, described DC micro breaker actuation, drive the push rod of described electromagnetic system towards the lateral movement of described snap close one, and compress described snap close and make it move to the second place from primary importance, realize being separated between the moving contact of described DC micro circuit breaker and fixed contact; Or
When described DC micro circuit breaker have be less than described instantaneous protection failure of the current electric current pass through time; described DC micro circuit breaker is failure to actuate within a certain period of time; and after flowing through described bimetallic element by described fault current; described bimetallic element heated bending is out of shape pulls described snap close to move to the described second place from described primary importance, realizes being separated between the moving contact of described DC micro circuit breaker and fixed contact.
Wherein, when described DC micro circuit breaker disconnect arbitrary electric current by time, by the back-moving spring be connected with described snap close, realize described snap close from described second place exercise recovery to described primary importance.
Wherein, described certain hour is 0.1 second.
Wherein, described spiraltron is formed by enamelled wire coiling.
Wherein, described skeleton is formed by plastic production, and it is hollow tubular, and outer wall is provided with described spiraltron, is embedded with described dynamic iron core and described static iron core; Wherein,
One end of described push rod is connected with described dynamic iron core through described static iron core, and the other end is positioned at the outside of described skeleton, can match with described snap close, and and reserve certain operating range between described snap close;
Described reaction spring is socketed on the outer wall of described push rod, and between described dynamic iron core and described static iron core;
When described spiraltron has electric current by time, drive described dynamic iron core to move towards described static iron core.
Wherein, described fault current is 24 times of described DC micro breaker rated current, and described instantaneous protection electric current is 28 times of described DC micro breaker rated current.
Wherein, the instantaneous protection current settings of described DC micro circuit breaker is between 600A-800A.
The embodiment of the present invention additionally provides a kind of direct current link gear for transforming plant DC power supply, and described link gear is provided with two aforesaid DC micro circuit breakers; Wherein,
Be connected with gangbar by handle and connecting rod between described two DC micro circuit breakers, and fixed by rivet.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, because DC micro circuit breaker can when fault current (24 times of rated current) be passed through, the electromagnetic force produced based on spiraltron in electromagnetic system and reaction spring compression stress are formed and balance, keep being failure to actuate in 0.1 second, subordinate's circuit breaker can be made first to disconnect fast, instantly when pole circuit breaker can not disconnect protection in 0.1 second, pull snap close to thread off (namely moving to the second place from primary importance) by the distortion of bimetallic element heated bending and disconnect fast, thus realize selective protection between the superior and the subordinate's circuit breaker in DC power system,
2, in embodiments of the present invention; because DC micro circuit breaker can when instantaneous protection electric current (28 times of rated current) be passed through; the electromagnetic force produced based on spiraltron in electromagnetic system is greater than reaction spring compression stress; iron core moves at electromagnetic force; and promote snap close dropout; realize being separated between the moving contact of DC micro circuit breaker and fixed contact, DC micro circuit breaker is disconnected fast, avoid spreading to upper level breaker actuation.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, the accompanying drawing obtaining other according to these accompanying drawings still belongs to category of the present invention.
Fig. 1 for the embodiment of the present invention one provide for view plane schematic diagram in the DC micro circuit breaker of transforming plant DC power-supply system;
Fig. 2 is the section plan of the electromagnetic system in Fig. 1;
The perspective view of the link gear for transforming plant DC power-supply system that Fig. 3 provides for the embodiment of the present invention two;
Fig. 4 is the perspective view of the one pole link gear in Fig. 3;
In figure, 1-housing, 2-electromagnetic system, 21-spiraltron, 22-skeleton, 23-moves iron core, 24-static iron core, 25-reaction spring, 26-push rod, 3-snap close, 4-bimetallic element, 5-handle and connecting rod, 6-gangbar.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
As depicted in figs. 1 and 2, in the embodiment of the present invention one, a kind of DC micro circuit breaker for transforming plant DC power-supply system provided, DC micro circuit breaker comprises housing 1, is provided with in housing 1:
One electromagnetic system 2, electromagnetic system 2 comprises spiraltron 21, skeleton 22, dynamic iron core 23, static iron core 24, reaction spring 25 and push rod 26; Wherein, spiraltron 21 is formed by enamelled wire coiling; Skeleton 22 is formed by plastic production, and it is hollow tubular, and outer wall is provided with spiraltron 21, is embedded with dynamic iron core 23 and static iron core 24; One end of push rod 26 is connected with dynamic iron core 23 through static iron core 24, and the other end is positioned at the outside of skeleton 22; Reaction spring 25 is socketed on the outer wall of push rod 26, and between dynamic iron core 23 and static iron core 24; When spiraltron 21 has electric current by time, drive dynamic iron core 23 to move towards static iron core 24;
One snap close 3, can match with the push rod 26 of electromagnetic system 2 in one end of snap close 3; Wherein, push rod 26 can match with snap close 3, and and reserve certain operating range between snap close 3;
One bimetallic element 4, bimetallic element 4 is connected with the other end of snap close 3;
Wherein, when DC micro circuit breaker have be more than or equal to instantaneous protection electric current pass through time, DC micro breaker actuation, drive the push rod 26 of electromagnetic system 2 towards snap close 3 one lateral movement, and compress snap close 3 and make it move to the second place from primary importance, realize being separated between the moving contact of DC micro circuit breaker and fixed contact; Or
When DC micro circuit breaker have be less than instantaneous protection failure of the current electric current pass through time; DC micro circuit breaker is failure to actuate within a certain period of time; and after flowing through bimetallic element 4 by fault current; bimetallic element 4 heated bending is out of shape pulls snap close 3 to move to the second place from primary importance, realizes being separated between the moving contact of DC micro circuit breaker and fixed contact.
It should be noted that snap close 3 moves to the second place from primary importance and is expressed as dropout, now DC micro circuit breaker disconnects; And snap close 3 from the second place move to primary importance be expressed as close button, now DC micro circuit breaker is that combined floodgate is prepared.
In the embodiment of the present invention one, when DC micro circuit breaker has fault current to pass through, the electromagnetic force produced based on spiraltron 21 in electromagnetic system 2 and reaction spring 25 compression stress are formed and balance, and DC micro circuit breaker can (as 0.1 second) be failure to actuate within a certain period of time.
Now, fault current will continue through next stage DC micro circuit breaker or other circuit breaker, and allow subordinate's DC micro circuit breaker or other breaker actuation first disconnect, self disconnects again; And when subordinate's DC micro circuit breaker or other circuit breaker not operating, then by bimetallic element 4 heated bending distortion pull snap close 3 to move to the second place from primary importance, realize self disconnect.Therefore, it is possible to realize selective protection between the superior and the subordinate's circuit breaker in DC power system.
In the embodiment of the present invention one; DC micro circuit breaker can when instantaneous protection electric current passes through; the electromagnetic force produced based on spiraltron 21 in electromagnetic system 2 is greater than reaction spring 25 compression stress; iron core moves at electromagnetic force; and promote snap close 3 and thread off; realize being separated between the moving contact of DC micro circuit breaker and fixed contact, DC micro circuit breaker is disconnected fast, avoid to upper level DC micro circuit breaker or the diffusion of other breaker actuation.
Further, when DC micro circuit breaker disconnect arbitrary electric current by time, by the back-moving spring be connected with snap close 3, realize snap close 3 from second place exercise recovery to primary importance, for DC micro breaker closing is prepared.
Further, fault current is 24 times of DC micro breaker rated current, and instantaneous protection electric current is 28 times of DC micro breaker rated current.
Further, the instantaneous protection current settings of DC micro circuit breaker is between 600A-800A.
The operation principle of the DC micro circuit breaker for transforming plant DC power supply of the embodiment of the present invention one is:
When the electric current that spiraltron 21 flows through is more than or equal to instantaneous protection electric current (i.e. 28 times of rated current), the electromagnetic force that spiraltron 21 produces drives dynamic iron core 23 to move towards static iron core 24, now because electromagnetic force is greater than the compression stress of reaction spring 25, dynamic iron core 23 is moved and drives push rod 26 towards snap close 3 one lateral movement, thus realize push rod 26 and promote snap close 3 and move to the second place (namely thread off) from primary importance, this DC micro breaker mechanism is opened, moving contact is driven to leave fixed contact, open circuit; And after the electric current in circuit disconnects, dynamic iron core 23 resets under the effect of reaction spring 25, for protection act prepares next time, reset (namely close and buckle) under the effect of snap close 3 back-moving spring thereon, for DC micro breaker closing is prepared;
When the electric current that spiraltron 21 flows through is greater than fault current (i.e. 24 times of rated current) and is less than instantaneous protection electric current, the electromagnetic force produced due to spiraltron 21 is less than reaction spring 25 by the reaction force compressed, dynamic iron core 23 move distance deficiency makes push rod 26 promote snap close 3, and breaker mechanism keeps motionless in 0.1s; The bimetallic element 4 of now connecting in circuit produces heat energy because fault current flows through, bimetallic element 4 flexural deformation is made to produce pulling force, pull snap close 3 to move to the second place (namely threading off) from primary importance, the dynamic/static contact realizing DC micro circuit breaker disconnects in 0.03s; And after the electric current in circuit disconnects, bimetallic element 4 dispels the heat and resets, be that protection act prepares next time, reset (namely close and buckle), for DC micro breaker closing is prepared under the effect of simultaneously snap close 3 back-moving spring thereon.
As Fig. 3 and as shown in Figure 4, corresponding to the DC micro circuit breaker for transforming plant DC power supply of the embodiment of the present invention one, the embodiment of the present invention two provides a kind of direct current link gear for transforming plant DC power supply, this link gear is provided with two aforesaid DC micro circuit breakers, be connected with gangbar 6 by handle and connecting rod 5 between these two DC micro circuit breakers, and fixed by rivet.Wherein, these two DC micro circuit breakers each there is separately the formation identical for the DC micro circuit breaker of transforming plant DC power supply described in the embodiment of the present invention one and annexation, detail and parameter refer to shown in Fig. 1 and Fig. 2, and this is no longer going to repeat them.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, because DC micro circuit breaker can when fault current (24 times of rated current) be passed through, the electromagnetic force produced based on spiraltron in electromagnetic system and reaction spring compression stress are formed and balance, keep being failure to actuate in 0.1 second, subordinate's circuit breaker can be made first to disconnect fast, instantly when pole circuit breaker can not disconnect protection in 0.1 second, pull snap close to thread off (namely moving to the second place from primary importance) by the distortion of bimetallic element heated bending and disconnect fast, thus realize selective protection between the superior and the subordinate's circuit breaker in DC power system,
2, in embodiments of the present invention; because DC micro circuit breaker can when instantaneous protection electric current (28 times of rated current) be passed through; the electromagnetic force produced based on spiraltron in electromagnetic system is greater than reaction spring compression stress; iron core moves at electromagnetic force; and promote snap close dropout; realize being separated between the moving contact of DC micro circuit breaker and fixed contact, DC micro circuit breaker is disconnected fast, avoid spreading to upper level breaker actuation.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (8)
1. for a DC micro circuit breaker for transforming plant DC power supply, it is characterized in that, described DC micro circuit breaker comprises housing (1), and described housing is provided with in (1):
One electromagnetic system (2), described electromagnetic system (2) comprises spiraltron (21), skeleton (22), dynamic iron core (23), static iron core (24), reaction spring (25) and push rod (26);
One snap close (3), can match with the push rod of described electromagnetic system (2) (26) in one end of described snap close (3);
One bimetallic element (4), described bimetallic element (4) is connected with the other end of described snap close (3);
Wherein, when described DC micro circuit breaker have be more than or equal to described instantaneous protection electric current pass through time, described DC micro breaker actuation, drive the push rod of described electromagnetic system (2) (26) towards the lateral movement of described snap close (3), and compress described snap close (3) and make it move to the second place from primary importance, realize being separated between the moving contact of described DC micro circuit breaker and fixed contact; Or
When described DC micro circuit breaker have be less than described instantaneous protection failure of the current electric current pass through time; described DC micro circuit breaker is failure to actuate within a certain period of time; and after flowing through described bimetallic element (4) by described fault current; described bimetallic element (4) heated bending is out of shape pulls described snap close (3) to move to the described second place from described primary importance, realizes being separated between the moving contact of described DC micro circuit breaker and fixed contact.
2. DC micro circuit breaker as claimed in claim 1, it is characterized in that, when described DC micro circuit breaker disconnect arbitrary electric current by time, by the back-moving spring be connected with described snap close (3), realize described snap close (3) from described second place exercise recovery to described primary importance.
3. DC micro circuit breaker as claimed in claim 2, it is characterized in that, described certain hour is 0.1 second.
4. DC micro circuit breaker as claimed in claim 3, it is characterized in that, described spiraltron (21) is formed by enamelled wire coiling.
5. DC micro circuit breaker as claimed in claim 4, it is characterized in that, described skeleton (22) is formed by plastic production, and it is hollow tubular, and outer wall is provided with described spiraltron (21), is embedded with described dynamic iron core (23) and described static iron core (24); Wherein,
One end of described push rod (26) is connected with described dynamic iron core (23) through described static iron core (24), and the other end is positioned at the outside of described skeleton (22), can match with described snap close (3), and and reserve certain operating range between described snap close (3);
Described reaction spring (25) is socketed on the outer wall of described push rod (26), and is positioned between described dynamic iron core (23) and described static iron core (24);
When described spiraltron (21) has electric current by time, drive described dynamic iron core (23) to move towards described static iron core (24).
6. DC micro circuit breaker as claimed in claim 5, it is characterized in that, described fault current is 24 times of described DC micro breaker rated current, and described instantaneous protection electric current is 28 times of described DC micro breaker rated current.
7. DC micro circuit breaker as claimed in claim 6, it is characterized in that, the instantaneous protection current settings of described DC micro circuit breaker is between 600A-800A.
8. for a direct current link gear for transforming plant DC power supply, it is characterized in that, described link gear is provided with two DC micro circuit breakers according to any one of claim 1 to 7; Wherein,
Be connected with gangbar (6) by handle and connecting rod (5) between described two DC micro circuit breakers, and fixed by rivet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510619393.9A CN105161377A (en) | 2015-09-25 | 2015-09-25 | Direct-current micro circuit breaker and link mechanism for substation direct-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510619393.9A CN105161377A (en) | 2015-09-25 | 2015-09-25 | Direct-current micro circuit breaker and link mechanism for substation direct-current power supply |
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| Publication Number | Publication Date |
|---|---|
| CN105161377A true CN105161377A (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510619393.9A Pending CN105161377A (en) | 2015-09-25 | 2015-09-25 | Direct-current micro circuit breaker and link mechanism for substation direct-current power supply |
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| CN (1) | CN105161377A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110010421A (en) * | 2019-04-22 | 2019-07-12 | 北京北元电器有限公司 | Selective small-sized DC breaker and tripping guard method |
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| DE3340250A1 (en) * | 1983-11-08 | 1985-05-15 | Heinrich Kopp Gmbh & Co Kg, 8756 Kahl | Earth-leakage current protection circuit breaker (section) having a reduced-voltage trip device |
| JP2009199899A (en) * | 2008-02-21 | 2009-09-03 | Panasonic Electric Works Denro Co Ltd | Circuit breaker |
| CN101937811A (en) * | 2010-09-21 | 2011-01-05 | 上海良信电器股份有限公司 | Automatic resetting mechanism of electromagnetic release |
| CN202230965U (en) * | 2011-03-10 | 2012-05-23 | 北京博顿电气有限公司 | Overvoltage protection type minisize breaker with width of 36 mm |
| CN202651039U (en) * | 2012-07-10 | 2013-01-02 | 浙江麦克力电气有限公司 | Miniature breaker |
| CN204155866U (en) * | 2014-09-03 | 2015-02-11 | 温州奥来电器有限公司 | A kind of plug-in type residual current circuit breaker |
| CN204464206U (en) * | 2015-04-08 | 2015-07-08 | 浙江天正电气股份有限公司 | Long-distance Control close/open machine and circuit breaker |
| CN204991635U (en) * | 2015-09-25 | 2016-01-20 | 深圳供电局有限公司 | A direct current miniature circuit breaker and link gear for DC power supply of transformer substation |
-
2015
- 2015-09-25 CN CN201510619393.9A patent/CN105161377A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3340250A1 (en) * | 1983-11-08 | 1985-05-15 | Heinrich Kopp Gmbh & Co Kg, 8756 Kahl | Earth-leakage current protection circuit breaker (section) having a reduced-voltage trip device |
| JP2009199899A (en) * | 2008-02-21 | 2009-09-03 | Panasonic Electric Works Denro Co Ltd | Circuit breaker |
| CN101937811A (en) * | 2010-09-21 | 2011-01-05 | 上海良信电器股份有限公司 | Automatic resetting mechanism of electromagnetic release |
| CN202230965U (en) * | 2011-03-10 | 2012-05-23 | 北京博顿电气有限公司 | Overvoltage protection type minisize breaker with width of 36 mm |
| CN202651039U (en) * | 2012-07-10 | 2013-01-02 | 浙江麦克力电气有限公司 | Miniature breaker |
| CN204155866U (en) * | 2014-09-03 | 2015-02-11 | 温州奥来电器有限公司 | A kind of plug-in type residual current circuit breaker |
| CN204464206U (en) * | 2015-04-08 | 2015-07-08 | 浙江天正电气股份有限公司 | Long-distance Control close/open machine and circuit breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110010421A (en) * | 2019-04-22 | 2019-07-12 | 北京北元电器有限公司 | Selective small-sized DC breaker and tripping guard method |
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Application publication date: 20151216 |