CN104426131A - Leakage circuit breaker - Google Patents
Leakage circuit breaker Download PDFInfo
- Publication number
- CN104426131A CN104426131A CN201410171587.2A CN201410171587A CN104426131A CN 104426131 A CN104426131 A CN 104426131A CN 201410171587 A CN201410171587 A CN 201410171587A CN 104426131 A CN104426131 A CN 104426131A
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- Prior art keywords
- test
- circuit
- self
- test pulse
- leakage
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
- H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
-
- 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
- H01H71/04—Means for indicating condition of the switching device
-
- 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
- H01H71/04—Means for indicating condition of the switching device
- H01H2071/042—Means for indicating condition of the switching device with different indications for different conditions, e.g. contact position, overload, short circuit or earth leakage
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- Emergency Protection Circuit Devices (AREA)
- Breakers (AREA)
Abstract
The invention provides a leakage circuit breaker having the test function, whreien the AC circuit is free from being switched off and then the leakage detection can be done at the same time. The leakage circuit breaker comprises a leakge identifying part connected with the secondary winding (3a) of a zero-phase converte in an AC circuit and used for detecting the leakage current flowing in the AC circuit and outputting a leakage detection signal; a trip device (8) used for separating on/off contacts in the AC circuit based on the outputted leakage detection signal; a test circuit used for driving the test current to flow in the test winding (12) of the zero-phase converter; a self-checking test pulse generating circuit used for supplying a self-checking test pulse signal to the test circuit; and a test pulse identifying part. The leakage circuit breaker also has a self-inspection abnormal display device.
Description
Technical field
The residual current circuit breaker disconnected by this circuit when the present invention relates to generation electric leakage or ground short circuit in alternating current circuit, especially, relate to the residual current circuit breaker with test circuit, this test circuit makes pseudo-leakage current flow through circuit and carry out leakage tests.
Background technology
As the existing residual current circuit breaker with testing apparatus, consist of, such as, have: electric-leakage detection circuit, it utilizes the imbalance that by electric leakage etc. caused of zero phase current transformer to line current to detect, and exports the trip signal disconnected by circuit, leakage tests switch, it manufactures the puppet electric leakage state of circuit, trip signal is exported artificially to electric-leakage detection circuit, in addition, this residual current circuit breaker also has the remote testing switch be connected with this leakage tests switch in parallel via relay, to make long-rangely to carry out leakage tests, when carrying out leakage tests, by operating leakage tests switch or remote testing switch, manufacture the puppet electric leakage state of circuit, trip signal is exported to electric-leakage detection circuit, alternating current circuit is disconnected, thus be judged as that residual current circuit breaker is normal (such as, with reference to patent documentation 1).
Patent documentation 1: Japanese Unexamined Patent Publication 8-106844 publication (the 2nd page, Fig. 1)
Existingly have in the residual current circuit breaker of testing apparatus patent documentation 1 is this, due to when having carried out leakage tests operation, the alternating current circuit being connected with residual current circuit breaker can be disconnected, therefore, cause the power supply to the load be connected with alternating current circuit temporarily to stop.Preferably implement leakage tests termly, but for the user that can not stop power supply, there is the problem cannot carrying out residual current circuit breaker inspection.
Summary of the invention
The present invention proposes to solve the problem, and object is to obtain a kind of residual current circuit breaker, and it has just can confirm the whether normal test function of earth leakage detection functions without the need to alternating current circuit being disconnected.
Residual current circuit breaker involved in the present invention has: zero phase current transformer, and it is inserted in alternating current circuit; Detection of electrical leakage unit, it is connected with the secondary winding be wound on zero phase current transformer, when the leakage current flowed exceedes the rank of regulation, exports detection of electrical leakage signal in alternating current circuit; Trip unit, it makes the opening and closing contact separation be inserted in alternating current circuit according to the output of detection of electrical leakage signal; Test circuit, it makes measuring current flow through to be wound on the test winding on zero phase current transformer; Test pulse generating unit, it can not be supplied to test circuit by the test pulse signal of the self-inspection detected as detection of electrical leakage signal; And test pulse detecting unit, it detects test pulse signal, this residual current circuit breaker has display unit, when carrying out self-checking, when exporting the test pulse signal of self-inspection and do not have tested pulse detecting unit to detect, this display unit regards as exception, shows test results and does not make trip unit action.
The effect of invention
According to residual current circuit breaker of the present invention, the basis of common test circuit has test pulse generating unit and test pulse detecting unit, this test pulse generating unit can not be supplied to test circuit by the test pulse signal of the self-inspection detected as detection of electrical leakage signal, this residual current circuit breaker also has display unit, when not having tested pulse detecting unit to detect at the test pulse signal exporting self-inspection, this display unit regards as exception, show test results and do not make trip unit action, therefore, residual current circuit breaker of the present invention just can easily checkout winding without the need to alternating current circuit being disconnected, whether a part for the earth leakage detection functions such as secondary winding is normal.
Accompanying drawing explanation
Fig. 1 is the block diagram of the structure of the residual current circuit breaker representing embodiment of the present invention 1.
Fig. 2 is the sequential chart of the action of the circuit portions of the residual current circuit breaker representing Fig. 1.
Fig. 3 is the block diagram of the structure of the residual current circuit breaker representing embodiment of the present invention 2.
Fig. 4 is the sequential chart of the action of the circuit portions of the residual current circuit breaker representing Fig. 3.
The explanation of label
1 alternating current circuit, 2 opening and closing contacts, 3 zero phase current transformers, 3a secondary winding, 4A/D transformation component, 5 electric leakage judegment parts, 6 switch elements, 7 breaking coils, 8 tripping mechanisms, 9 testing buttons, 10 test pulse circuit for generatings, 11 resistance, 12 test windings, 13 switch elements, 14 self-checking signal generating sources, 15 self-checking pulse generating circuits, 16 switch elements, 17 test pulse judegment parts, 18NOT circuit, 19AND circuit, 20 switch elements, 21 resistance, 22 self-inspection abnormal show devices, 23AC/DC power circuit, 31, 32 diodes, 33, 34 switch elements, 35, 36 resistance, 37 test action display unit, 38 switch elements, 100, 101 residual current circuit breaker.
Embodiment
Execution mode 1.
Fig. 1 is the block diagram of the structure of the residual current circuit breaker represented in embodiments of the present invention 1.Fig. 2 is the sequential chart of the action representing Fig. 1.
First, explanation from overall structure.In FIG, residual current circuit breaker 100 has: opening and closing contact 2, and it makes alternating current circuit 1 break-make; Zero phase current transformer (ZCT) 3, it is inserted in the midway of alternating current circuit 1; A/D transformation component 4, it is connected with the secondary winding 3a of zero phase current transformer 3, and the output signal of zero phase current transformer 3 is transformed to digital value; Electric leakage judegment part 5, it is as detection of electrical leakage unit, carries out detection of electrical leakage based on the digital signal from this A/D transformation component 4; Breaking coil 7, it is energized via switch element 6 according to the output signal of this electric leakage judegment part 5; And tripping mechanism 8, it is when this breaking coil 7 is energized, and splits closed contact 2 and carries out separation driving.That is, residual current circuit breaker 100 has cut-out function and earth leakage detection functions.
In addition, trip unit is formed by above-mentioned breaking coil 7 and tripping mechanism 8.
In addition, residual current circuit breaker 100 has: testing button 9, and it is for carrying out leakage function test by user; Test pulse circuit for generating 10, it, when this testing button 9 is switched on, produces the drive singal for generating measuring current; And switch element 13, it is driven by this test pulse circuit for generating 10, makes the measuring current being adjusted to rated current value flow through test winding 12, form test circuit by these unit via resistance 11.
In addition, residual current circuit breaker 100 has: self-checking signal generating source 14, and it produces the signal for carrying out self-checking action; Self-checking pulse generating circuit 15, it is as test pulse generating unit, when this self-checking signal generating source 14 starts, produces the drive singal of the pulse duration that electric leakage judegment part 5 cannot detect; And switch element 16, it is driven by this self-checking pulse generating circuit 15, flows through test winding 12 for making self-checking pulse current via resistance 11.
That is, in the present embodiment, for generation of outside the test pulse circuit for generating 10 of pseudo-leakage current making trip unit action, the test pulse generating unit as self-checking is provided with self-checking pulse generating circuit 15.
In addition, have test pulse judegment part 17 as test pulse detecting unit, it detects self-checking pulse current based on the digital signal from A/D transformation component 4.
In addition, have: NOT circuit 18, it makes the output signal of this test pulse judegment part 17 reverse; AND circuit 19, it exports and carries out AND to the output signal of this NOT circuit 18 and self-checking signal generating source 14 and the signal that obtains; Switch element 20, it is driven by the output signal of AND circuit 19; And self-inspection abnormal show device 22, it is as display unit, when switch element 20 is connected, is driven and show exception via resistance 21.
In addition, as power circuit, there is AC/DC power circuit 23, its flow through for supplying breaking coil 7 exciting current, flow through the test measuring current of the winding 12 and DC power supply for internal circuits such as test pulse circuit for generatings 10.
Below, with reference to the sequential chart of Fig. 2, each action in residual current circuit breaker 100 is described.
First, explanation from electric leakage action.
If leaked electricity in alternating current circuit 1, then export ZCT by zero phase current transformer 3 and output signal D, this signal D inputs to electric leakage judegment part 5 via A/D transformation component 4.If be determined as electric leakage in electric leakage judegment part 5, then export detection of electrical leakage output signal E, switch element 6 is driven, and supplies exciting current J to breaking coil 7, splits closed contact 2 carry out separation driving via tripping mechanism 8.
At this moment, in order to prevent the unnecessary action caused by the surge of moment or noise etc., in electric leakage judegment part 5, be only electric leakage by the input signal distinguishing of the width had to a certain degree.
Below, test action is described.
If closed by testing button 9, then power supply (A point voltage) is supplied to test pulse circuit for generating 10, measuring current C and is supplied to test winding 12 via switch element 13.At this moment, the pulse duration of the measuring current C caused by the drive singal generated in test pulse circuit for generating 10, become the duty ratio simulating electric leakage, therefore, draw the differentiation result identical with electric leakage action and export detection of electrical leakage in electric leakage judegment part 5 and output signal E, in the same manner as in time occurring to leak electricity, drive trip unit, residual current circuit breaker 100 trips.
Below, self-checking action is described.
If outputed signal by self-checking signal generating source 14, in self-checking pulse generating circuit 15, there is self-checking input B, then switch element 16 is driven, and measuring current C flows through test winding 12 as self-checking signal.Self-checking pulse now as previously mentioned, is the self-inspection test pulse signal of the little width-pulse less than the width detected by electric leakage judegment part 5, therefore, in electric leakage judegment part 5, is not determined as electric leakage, do not export detection of electrical leakage output signal E.
In addition, the output signal from self-checking signal generating source 14 also inputs to AND circuit 19.
On the other hand, in test pulse judegment part 17, this self-checking electric current is detected, export test pulse and detect output signal G.G owing to being inverted in NOT circuit 18 for output signal, therefore the output to switch element 20 cancelled by AND circuit 19.Thus, even if output self-checking signal B, the output from test pulse judegment part 17 also can not export to switch element 20.Self-checking action when this is normal.
Here, when carrying out self-checking action, in test winding 12, broken string etc. is there is if there occurs, when test pulse judegment part 17 does not detect self-checking electric current such exception, not output signal output G, and being exported by NOT circuit 18 and AND circuit 19 that self-inspection is abnormal outputs signal H, switch element 20 is driven, and flows through self-inspection abnormal show operating current K and makes self-inspection abnormal show device 22 (such as light-emitting diode etc.) action.
In addition, when aforesaid electric leakage action, test action, also can export test pulse from test pulse judegment part 17 and detect output signal G, if but owing to not having output from detection trial signal B, then by AND circuit 19, the output to switch element 20 can be cancelled, therefore, self-inspection abnormal show device 22 (such as light-emitting diode etc.) can not action.
In addition, self-inspection abnormal show device 22 is the abnormal unit of display, but is not limited to abnormal show, also can link with the output information of self-checking signal and when not exporting self-inspection exception and outputing signal H normal, normally show.That is, as long as play the effect of the display unit of display self-checking result.
In addition, from the signal B that self-checking signal generating source 14 exports, also can use not shown self-checking button or export based on the self-checking instruction from outside, but be preferably configured to have the automatic generation function that automatically produced by microcomputer etc. and regularly export.
In addition, in the present embodiment, each structural portion is illustrated as hardware, but A/D transformation component 4, electric leakage judegment part 5, test pulse judegment part 17, test pulse circuit for generating 10, self-checking pulse generating circuit 15, self-checking signal generating source 14, NOT circuit 18 and AND circuit 19 etc., also can be configured to the software of microcomputer.
As mentioned above, according to the residual current circuit breaker of execution mode 1, have: zero phase current transformer, it is inserted in alternating current circuit; Detection of electrical leakage unit, it is connected with the secondary winding be wound on zero phase current transformer, when the leakage current flowed exceedes rank (level) of regulation, exports detection of electrical leakage signal in alternating current circuit; Trip unit, it makes the opening and closing contact separation be inserted in alternating current circuit according to the output of detection of electrical leakage signal; Test circuit, it makes measuring current flow through to be wound on the test winding on zero phase current transformer; Test pulse generating unit, it can not be supplied to test circuit by the test pulse signal of the self-inspection detected as detection of electrical leakage signal; And test pulse detecting unit, it detects test pulse signal, residual current circuit breaker has display unit, when carrying out self-checking, when exporting the test pulse signal of self-inspection and do not have tested pulse detecting unit to detect, this display unit regards as exception, show test results and do not make trip unit action, therefore, without the need to alternating current circuit is disconnected, just can the part of the easily earth leakage detection functions such as checkout winding, secondary winding whether normal.
Execution mode 2.
Fig. 3 is the block diagram of the structure of the residual current circuit breaker represented in embodiment of the present invention 2.In addition, Fig. 4 is the sequential chart of the action representing the residual current circuit breaker shown in Fig. 3.
In execution mode 1 above, owing to having separated the drive circuit (switch element 6,20 etc.) of self-inspection and detection of electrical leakage (comprising test action), therefore, the exceptions such as the broken string of breaking coil 7 cannot be checked when self-inspection.
Therefore, in the present embodiment, make the drive circuit of self-inspection and detection of electrical leakage (comprising test action) common, even if also can the abnormal examinations such as the broken string of breaking coil 7 be carried out when self-inspection.
To the same label of portion markings be equal to Fig. 1 of execution mode 1, omit detailed description, to be mainly below described around difference.
In figure 3, the test pulse circuit for generating 10 of present embodiment is also with the function of the self-checking pulse generating circuit 15 of execution mode 1.That is, this part becomes the test pulse generating unit of self-inspection.
To the switch element 6 that breaking coil 7 drives, driven by electric leakage judegment part 5 via diode 31, in addition, also driven by test pulse judegment part 17 via diode 32.The positive pole of diode 32 is connected with the tie point of test pulse judegment part 17 and NOT circuit 18.Further, between the tie point and ground connection of test pulse judegment part 17 and NOT circuit 18, the switch element 33 driven by electric leakage judegment part 5 is connected with.
Between switch element 6 and breaking coil 7, be connected with the switch element 34 being driven (becoming conducting) from the output signal of NOT circuit 18.
In addition, this switch element 34 is connected in parallel with resistance 35.At the tie point place of switch element 34 and breaking coil 7, be connected with one end of test action display unit 37 via resistance 36, the other end of test action display unit 37, via switch element 38, is connected with the tie point of switch element 34 and switch element 6.
Below, with reference to the sequential chart of Fig. 4, the electric leakage action when electric leakage of residual current circuit breaker 101 is described and carry out the test action of self-inspection.
First, explanation from electric leakage action.
If leaked electricity in alternating current circuit 1, then by zero phase current transformer 3 output detection signal, if be determined as electric leakage by electric leakage judegment part 5, then switch element 6 is switched on.At this moment, also export test pulse from test pulse judegment part 17 simultaneously and detect output G, but due to the output E by electric leakage judegment part 5, switch element 33 is switched on, therefore, can not to NOT circuit 18 input test actuating signal H, and switch element 34 becomes conducting.Thus, supply exciting current J via switch element 34 to breaking coil 7 by the connection of switch element 6, split closed contact 2 via tripping mechanism 8 and carry out separation driving.
At this moment, due to switch element 34 conducting, therefore switch element 38 is not switched on, and electric current can not flow into test action display unit 37, thus is failure to actuate.
Below, the self-checking action for execution mode 2 is described.
If closed by testing button 9, then to test pulse circuit for generating 10 supply power, measuring current C flows to test winding 12 via switch element 13.Test pulse now, in the same manner as the self-checking pulse described in execution mode 1, becomes the signal less than the width being determined as electric leakage, can not be determined as electric leakage and do not export in electric leakage judegment part 5.On the other hand, in test pulse judegment part 17, detect that this test pulse is gone forward side by side line output.Detect output signal G according to the test pulse of test pulse judegment part 17, switch element 6 is connected.At this moment, H is exported owing to have input test action to NOT circuit 18, therefore, switch element 34 ends, switch element 38 is switched on, the exciting current of breaking coil 7, via resistance 36, test action display unit 37 and flowing as test action display driver electric current K, makes test action display unit 37 action.Action when this is normal.
During self-checking remarkable action, can't detect test pulse and detect output signal G, test action display unit 37 is failure to actuate.
In addition, also can when testing button 9 close, when not exporting G, the test action display driver electric current K flowing of test pulse detection output signal, it is abnormal that test action display unit 37 is judged to be that earth leakage detection functions occurs, carries out abnormal show.That is, as long as play the effect of the display unit of test result.
As mentioned above, can confirm that whether the circuit including breaking coil 7 is normal by this test action.
The value of resistance 36 is set as, suppresses electric current for being enough to make test action display unit 37 action and is not enough to make tripping mechanism 8 action.That is, when self-checking operates, residual current circuit breaker 101 does not trip, and is only test action display unit 37 action.
In addition, as long as the pulse duration of the test pulse generated in test pulse circuit for generating 10 is set to the duty ratio simulating electric leakage, just can in time there occurs electric leakage in the same manner as trip unit is driven, carry out the test action that residual current circuit breaker 101 is tripped.
In addition, as described in execution mode 1, about self-checking pulse, be configured to have the automatic generation function that automatically produced by microcomputer etc. and regularly carry out exporting.Thus, just can check out that earth leakage detection functions is in normal condition termly without the need to alternating current circuit being disconnected.
As mentioned above, according to the residual current circuit breaker of execution mode 2, there is the detection of electrical leakage unit same with execution mode 1, test circuit, test pulse generating unit, with test pulse detecting unit, on the basis of this structure, by a part for the drive circuit driven trip unit and common to a part for the drive circuit that display unit drives, therefore, in the same manner as execution mode 1, without the need to alternating current circuit is disconnected, just can easily checkout winding, whether a part for the earth leakage detection functions such as secondary winding is normal, in addition, can also confirm that when carrying out test action whether the drive circuit of trip unit is normal.
In addition, owing to having the automatic generation function automatically producing self-inspection test pulse signal, therefore, it is possible to whether the earth leakage detection functions reviewing and validate residual current circuit breaker is termly normal.
In addition, the present application can in its invention scope, by each execution mode independent assortment or suitably change each execution mode, omit.
Claims (3)
1. a residual current circuit breaker, is characterized in that, has:
Zero phase current transformer (3), it is inserted in alternating current circuit (1);
Detection of electrical leakage unit (5), it is connected with the secondary winding (3a) be wound on described zero phase current transformer (3), when the leakage current of flowing exceedes the rank of regulation in described alternating current circuit (1), export detection of electrical leakage signal;
Trip unit (7,8), it makes the opening and closing contact (2) be inserted in described alternating current circuit (1) be separated according to the output of described detection of electrical leakage signal;
Test circuit (9,10,13), it makes measuring current flow through to be wound on the test winding (12) on described zero phase current transformer (3);
Test pulse generating unit (15), it can not be supplied to described test circuit (9,10,13) by the test pulse signal of the self-inspection detected as described detection of electrical leakage signal; And
Test pulse detecting unit (17), it detects described test pulse signal,
This residual current circuit breaker has display unit (22,37), when carrying out self-checking, when exporting the test pulse signal of described self-inspection and do not detected by described test pulse detecting unit (17), this display unit (22,37) regards as exception, shows test results and does not make described trip unit (7,8) action.
2. residual current circuit breaker according to claim 1, is characterized in that,
By a part for the drive circuit driven described trip unit (7,8) and common to a part for the drive circuit that described display unit (22,37) drives.
3. residual current circuit breaker according to claim 1 and 2, is characterized in that,
There is the automatic generation function of the test pulse signal automatically producing described self-inspection.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013171861A JP6173118B2 (en) | 2013-08-22 | 2013-08-22 | Earth leakage breaker |
| JP2013-171861 | 2013-08-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104426131A true CN104426131A (en) | 2015-03-18 |
| CN104426131B CN104426131B (en) | 2018-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410171587.2A Active CN104426131B (en) | 2013-08-22 | 2014-04-25 | Rccb |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6173118B2 (en) |
| KR (1) | KR101553766B1 (en) |
| CN (1) | CN104426131B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759791B (en) * | 2016-04-22 | 2018-05-04 | 浙江科能达电气有限公司 | Intelligent controller of circuit breaker and real-time detection method based on intelligent controller |
| CN107689313A (en) * | 2016-08-05 | 2018-02-13 | 天津中电华利电器科技集团有限公司 | A kind of low-voltage circuit breaker |
| EP3386052B1 (en) | 2017-04-04 | 2021-06-23 | ABB Schweiz AG | Electronic protection device |
| FR3068138B1 (en) * | 2017-06-22 | 2019-07-19 | Schneider Electric Industries Sas | DEVICE AND METHOD FOR TESTING THE OPERATION OF A PROTECTIVE APPARATUS AND PROTECTIVE APPARATUS COMPRISING SUCH A DEVICE FOR TESTING |
| CN109061360B (en) * | 2018-06-21 | 2020-12-15 | 浙江巨磁智能技术有限公司 | Leakage protection safety self-checking system and self-checking method thereof |
| JP6730390B2 (en) * | 2018-09-12 | 2020-07-29 | 太平洋工業株式会社 | Safety circuit and charging cable |
| KR102046589B1 (en) | 2018-11-30 | 2019-12-02 | 한국전기연구원 | Residual-Current Device with Automatic Test |
| CN111614059B (en) * | 2020-07-09 | 2022-09-09 | 上海复旦微电子集团股份有限公司 | Ground fault protection system |
| JP2022059189A (en) * | 2020-10-01 | 2022-04-13 | 富士電機株式会社 | Power conversion device |
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| JP2009142021A (en) * | 2007-12-05 | 2009-06-25 | Mitsubishi Electric Corp | Leakage relay |
| CN101540249A (en) * | 2008-03-17 | 2009-09-23 | 三菱电机株式会社 | Creepage breaker |
| CN201682264U (en) * | 2010-05-19 | 2010-12-22 | 王士纲 | Leakage protector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5925145U (en) * | 1982-08-05 | 1984-02-16 | 寺崎電気産業株式会社 | circuit breaker test circuit |
| JP3485976B2 (en) * | 1994-10-05 | 2004-01-13 | 三菱電機株式会社 | Remote test equipment for earth leakage breaker |
| JP2001236872A (en) * | 2000-02-22 | 2001-08-31 | Hitachi Ltd | Detection device of breaker for wiring |
| JP2003323841A (en) * | 2002-04-26 | 2003-11-14 | Hitachi Industrial Equipment Systems Co Ltd | Ground leakage breaker |
| KR100703924B1 (en) | 2006-02-20 | 2007-08-10 | 제일전기공업 주식회사 | Earth leakage circuit breaker with selftest function |
| FR2910189B1 (en) * | 2006-12-18 | 2009-01-09 | Schneider Electric Ind Sas | DEVICE FOR DIFFERENTIAL PROTECTION. |
-
2013
- 2013-08-22 JP JP2013171861A patent/JP6173118B2/en active Active
-
2014
- 2014-02-20 KR KR1020140019662A patent/KR101553766B1/en active IP Right Grant
- 2014-04-25 CN CN201410171587.2A patent/CN104426131B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009142021A (en) * | 2007-12-05 | 2009-06-25 | Mitsubishi Electric Corp | Leakage relay |
| CN101540249A (en) * | 2008-03-17 | 2009-09-23 | 三菱电机株式会社 | Creepage breaker |
| CN201682264U (en) * | 2010-05-19 | 2010-12-22 | 王士纲 | Leakage protector |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101553766B1 (en) | 2015-09-16 |
| JP2015041497A (en) | 2015-03-02 |
| JP6173118B2 (en) | 2017-08-02 |
| CN104426131B (en) | 2018-03-02 |
| KR20150022628A (en) | 2015-03-04 |
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