CN103595019A - Method and device used for free tripping neutral pole of switch - Google Patents
Method and device used for free tripping neutral pole of switch Download PDFInfo
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- CN103595019A CN103595019A CN201210294772.1A CN201210294772A CN103595019A CN 103595019 A CN103595019 A CN 103595019A CN 201210294772 A CN201210294772 A CN 201210294772A CN 103595019 A CN103595019 A CN 103595019A
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Abstract
The invention provides a method and device used for free tripping a neutral pole of a switch, for the purpose of avoiding corrosion and welding problems of contacts. The method for free tripping the neutral pole of the switch comprises: detecting voltage at a wire outgoing end of a phase pole of the switch; and triggering an actuator based on the voltage at the wire outgoing end so as to control the tripping state of the neutral pole of the switch. According to the invention, the actuator is triggered through the voltage at the wire outgoing end based on the phase pole, and the neutral pole is driven to trip by the actuator, thus the tripping of the neutral pole is a complete mechanical process, the corrosion and welding problems of the contacts are avoided, the service life of the components is prolonged, and the cost is saved.
Description
Technical field
The present invention relates to a kind of method and apparatus of trip free of the neutral pole for switch, particularly a kind of switch being used in conjunction with assembling printed circuit board (PCB) (Printed Circuit Board Assembly, PCBA).
Background technology
At present, in switch at home, in residual current circuit breaker (RCBO) or miniature circuit breaker (MCB), neutral pole N does not have arc extinguishing ability (this position is accounted for by PCBA), generally the high breaking capacity that utilizes phase utmost point P, the contact of thickening neutral pole N, and neutral pole N uses are-tight contact material instead, for example AgWC, can shoulder over neutral pole contact in whole breaking course firmly.But so not only cost is very high, and can not solve the problem of contact violent corrosion in breaking course completely, easily occur the serious problems such as contact melting welding.Especially when large electric current flows through circuit, the galvano-cautery meeting of contact is more serious, so that contact melting welding and afterwards can not working on.
Summary of the invention
The embodiment of the present invention provides a kind of method and apparatus of trip free of the neutral pole for switch, can avoid the problem of contact corrosion and melting welding.
According to an aspect of the present invention, provide a kind of method of trip free of the neutral pole for switch, having comprised: the voltage of the leading-out terminal of the phase utmost point of sense switch; And the voltage based on this leading-out terminal triggers actuator, to control the trip status of the neutral pole of described switch.
According to another aspect of the present invention, provide a kind of equipment of trip free of the neutral pole for switch, having comprised: detector, for detection of the voltage of the leading-out terminal of the phase utmost point of switch; Controller, triggers actuator for the voltage based on this leading-out terminal; And actuator, for control the trip status of the neutral pole of described switch under the control of described controller.
Therefore, according to the embodiment of the present invention, because the voltage by the leading-out terminal based on the phase utmost point triggers actuator and is promoted the dropout of neutral pole by actuator, so the dropout of neutral pole is a mechanical process completely, thereby corrosion and the welding problems of contact have been avoided, extend the useful life of element, saved cost.
Accompanying drawing explanation
In the detailed description of carrying out below in conjunction with accompanying drawing, will more clearly understand the example embodiment of the present invention's design, in the accompanying drawings:
Fig. 1 is schematically illustrated according to an embodiment of the invention for the flow chart of the method for the trip free of the neutral pole of switch;
Fig. 2 is the block diagram illustrating according to an embodiment of the invention for the demonstrative structure of the equipment of the trip free of the neutral pole of switch;
Fig. 3 is the exemplary circuit diagram illustrating according to the first implementation of the equipment of the trip free of the neutral pole for switch of the embodiment of the present invention; And
Fig. 4 is the exemplary circuit diagram illustrating according to the second implementation of the equipment of the trip free of the neutral pole for switch of the embodiment of the present invention.
Embodiment
The one exemplary embodiment of the present invention that helps complete understanding to be limited by claim and equivalent thereof of the following describes with reference to accompanying drawing is provided.It comprises that various details are to help understanding, but they should be thought to be only exemplary.Therefore, those of ordinary skills will be appreciated that, can make various changes and modification to the embodiments described herein, and can not deviate from scope and spirit of the present invention.Equally, for clarity and conciseness, omitted the description to known function and structure.
It should be understood that when claim an element another element " on " time, it can be located immediately on other elements or therebetween can there is insertion element.On the contrary, when claim an element " directly " another element " on " time, there is not any insertion element.As used herein, term "and/or" comprises one or more relevant any and whole combinations of listing item.
Should be appreciated that it can be directly connected or coupled to another element or can have intermediary element when an element is called as " connection " or " coupling " to another element.On the contrary, when an element is called as " directly connection " or " directly coupling " to another element, there is not intermediary element.Other words that are used for describing the relation between element should be explained in a similar manner (for example, " and between " with respect to " directly between ", " adjacent " with respect to " direct neighbor " etc.).
Although it should be understood that and can use term first, second, third, etc. to describe various elements, assembly, region, layer and/or part here, these elements, assembly, region, layer and/or part do not should be these terms and limit.These terms are only used to an element, assembly, region, layer and/or part and another element, assembly, region, layer and/or part to distinguish mutually.Thereby the first element discussed below, assembly, region, layer and/or part can be called the second element, assembly, region, layer and/or part, and can not deviate from instruction of the present invention.
The term here using is only used to describe the object of specific embodiment, and is not intended to limit the present invention.As used herein, singulative " ", " one " and " being somebody's turn to do " are intended to also comprise plural form, unless that context explicitly points out is really not so.Be to be further appreciated that, when using in this manual, term " comprises " and/or " comprising ... " or " comprising " and/or " comprising ... " specifies the existence of feature, region, integer, step, operation, element and/or the assembly of setting forth, but do not get rid of, does not exist or adds one or more other features, region, integer, step, operation, element and/or assembly and/or its group.
In addition, can use here such as the relative terms of " bottom " or " bottom " and " ”Huo“ top, top " and describe an element as shown in FIG. relation to another element.It should be understood that relative terms is intended to contain the different azimuth of the equipment the orientation of describing in figure.For example, if the equipment overturning in a figure, the element that is described as be in other elements " bottom " side will turn to " top " side of other elements.Therefore, exemplary term " bottom " can depend on the concrete orientation of accompanying drawing and contain " ”He“ top, bottom " orientation the two.Similarly, if the equipment overturning in a figure, be described as be in other elements " under " or the element of " beneath " will turn to other elements " on ".Therefore, exemplary term " under " or " beneath " can contain " on " and " under " orientation the two.
Unless otherwise defined, otherwise all terms of using here have with the present invention under the identical implication conventionally understood of the those of ordinary skill in field.Be to be further appreciated that, such as those terms that define, should be interpreted as thering is the implication consistent with correlation technique and contextual its implication of the present disclosure in general dictionary, and should not making an explanation to it with idealized or too formal meaning, unless so definition clearly here.
Describe below with reference to the accompanying drawings the embodiment of the present invention in detail.
Fig. 1 is schematically illustrated according to an embodiment of the invention for the flow chart of the method 100 of the trip free of the neutral pole of switch.
As shown in fig. 1, method 100 110 in, the voltage of the leading-out terminal of the phase utmost point of sense switch.In 120, the voltage based on this leading-out terminal triggers actuator, to control the trip status of the neutral pole of described switch.
Therefore, according to the embodiment of the present invention, because the voltage by the leading-out terminal based on the phase utmost point triggers actuator and is promoted the dropout of neutral pole by actuator, so the dropout of neutral pole is a mechanical process completely, thereby corrosion and the welding problems of contact have been avoided, extend the useful life of element, saved cost.In addition, the breaking capacity of the embodiment of the present invention centering utmost point does not require, thereby can use the neutral pole that does not have breaking capacity or have faint breaking capacity.
Fig. 2 is the block diagram illustrating according to an embodiment of the invention for the demonstrative structure of the equipment 200 of the trip free of the neutral pole of switch.
As shown in Figure 2, equipment 200 comprises detector 201, controller 202 and actuator 203.
Particularly, detector 201 is for detection of the voltage of the leading-out terminal of the phase utmost point of switch, controller 202 triggers actuator for the voltage based on this leading-out terminal, and actuator 203 for controlling the trip status of the neutral pole of described switch under the control of described controller.
Therefore, according to the embodiment of the present invention, because the voltage by the leading-out terminal based on the phase utmost point triggers actuator and is promoted the dropout of neutral pole by actuator, so the dropout of neutral pole is a mechanical process completely, thereby corrosion and the welding problems of contact have been avoided, extend the useful life of element, saved cost.In addition, the breaking capacity of the embodiment of the present invention centering utmost point does not require, thereby can use the neutral pole that does not have breaking capacity or have faint breaking capacity.
Here, when the voltage that leading-out terminal detected when detector 201 is equal to or higher than a predetermined voltage threshold, controller 202 does not trigger actuator 203, thereby the neutral pole of switch is not threaded off; And the voltage that leading-out terminal detected when detector 201 is during lower than this predetermined voltage threshold, and described controller 202 triggers actuators 203, thereby actuator 203 promotes the neutral pole of described switch, threads off.
It should be noted in the discussion above that those skilled in the art can as required or test and determine this predetermined voltage threshold, so that this predetermined voltage threshold is suitable for actual needs and can allows certain voltage fluctuation.
Fig. 3 is the exemplary circuit diagram illustrating according to the first implementation 300 of the equipment of the trip free of the neutral pole for switch of the embodiment of the present invention.
In Fig. 3, actuator is depicted as to magnetictrip, still, the embodiment of the present invention is not limited to this, and those skilled in the art can select other suitable devices according to design requirement and operational environment, as long as its action of can threading off.In addition, controller is depicted as to PCBA.
As shown in Figure 3, in the first implementation 300, switch 302 comprises a neutral pole N and a phase utmost point P, and switch 302 can be for example the circuit breaker such as residual current circuit breaker (RCBO) or miniature circuit breaker (MCB).Although in the first implementation 300, switch 302 being depicted as is 1P+N structure, the invention is not restricted to this, those skilled in the art can understand that this switch 302 can also be heterogeneous structure, such as 2P+N, 3P+N, 4P+N etc., as will be described.
Here, the first implementation 300 is depicted as upper end power taking by switch 302, the upper end that is neutral pole N and phase utmost point P is that Qie Qi lower end, end of incoming cables is leading-out terminal, but those skilled in the art can understand, except end of incoming cables and leading-out terminal on the contrary, similar for the connected mode of lower end power taking and upper end power taking, repeats no more here.
Particularly, in the first implementation 300, the zero line of PCBA 303 is by mechanical organ K(switching device for example) be connected to the leading-out terminal of the neutral pole N of switch 302.Here, mechanical organ K is that, when neutral pole N is not closed, PCBA 303 does not connect with the neutral pole N of switch in order to make the zero line of PCBA 303 be suspended in the neutral pole N of switch.This suspension design is in order to guarantee the safety of installation personnel, and also inessential.
The live wire of PCBA 303 is connected to the end of incoming cables of the phase utmost point of switch 302, the voltage of the leading-out terminal of the phase utmost point P of detector 304 sense switches 302, and detection signal is sent in PCBA 303.Magnetictrip 301 can be connected in series with the live wire of PCBA 303, and couples with the neutral pole N of switch 302.
When the phase utmost point P of switch 302 closure, the voltage of its leading-out terminal is equal to or higher than a predetermined voltage threshold, for example the voltage of this leading-out terminal can be 220V, detector 304 detects this high voltage, thereby PCBA 303 does not trigger magnetictrip 301 and magnetictrip 301 is not taked action, so the neutral pole N of switch 302 does not thread off.
As the phase utmost point P of switch 302 because when disjunction, magnetic are de-, Re Tuo or other reasons are threaded off, the voltage of its leading-out terminal is lower than determining voltage threshold, for example the voltage of this leading-out terminal can be 0V, detector 304 detects this low-voltage, thereby PCBA 303 triggers the action of magnetictrip 301, with the neutral pole N dropout of pull switch 302.This process may cause from the dropout of phase utmost point P to a shorter time of delay the dropout of neutral pole N, for example, being between 0.5s to 2s, and can controlling this time of delay by circuit design.
Now, in circuit, due to the phase utmost point, P does not have electric current, thereby there is no electric current in circuit yet, so the dropout of neutral pole N is a mechanical process completely.Therefore, avoid corrosion and the welding problems of contact, extended the useful life of element.In addition, this process does not need neutral pole N to have breaking capacity, thereby can in circuit, use the neutral pole that does not have breaking capacity or have faint breaking capacity, has expanded the scope of application of circuit.
Although detector 304 is depicted as to the parts separated with PCBA 303 in Fig. 3, but those skilled in the art can understand, also can utilize the existing device of PCBA 303 inside to carry out the voltage of leading-out terminal of the phase utmost point P of sense switch 302, as long as the voltage that this device can this leading-out terminal of sensing notified PCBA 303.
Fig. 4 is the exemplary circuit diagram illustrating according to the second implementation 400 of the equipment of the trip free of the neutral pole for switch of the embodiment of the present invention, and wherein, switch 402 is 3P+N structure, and is upper end power taking.
When switch 402 is heterogeneous structure, can select in the plurality of phase utmost point P to bring in and to detect its voltage with the outlet of neutral pole N next-door neighbour's the phase utmost point.
In addition, in the second implementation 400, except the voltage of the leading-out terminal of a phase utmost point P, detector 404 also detects external signal, and the combination of the voltage based on this external signal and leading-out terminal triggers the action of magnetictrip 401 as the PCBA 403 of controller.The voltage that it should be noted that leading-out terminal and external signal are different signals, and this external signal can not be input to phase utmost point P.
For example, this external signal can be threaded off for being used to indicate neutral pole N user's instruction or the instruction of internal system.Based on this instruction, even if the voltage of the leading-out terminal of phase utmost point P is equal to or higher than predetermined voltage threshold, PCBA403 also triggers magnetictrip 401, makes the dropout of the neutral pole N of magnetictrip 401 pull switchs.
According to the embodiment of the present invention, the dropout part of neutral pole N can be one side dropout part, for example one side gear selenodont groove or unidirectional shared release lever so that do not drive neutral pole N to thread off together when phase utmost point P threads off, but can drive phase utmost point P to thread off together when neutral pole N threads off.It should be noted that, the one side dropout part of neutral pole N is not limited to one side gear selenodont groove and unidirectional shared release lever, those skilled in the art can use other mechanism as required, as long as it can be realized when phase utmost point P threads off and does not drive neutral pole N to thread off together and can drive phase utmost point P to thread off together when neutral pole N threads off.
In addition, external signal can be one or more in overvoltage signal, under-voltage signal and shunt opening signal, or can be other any signals that can be characterized as being voltage, comprises temperature, humidity etc.
Here, can adopt with door (AND) and be used as detector 404.But, the invention is not restricted to this, those skilled in the art can understand, can also adopt according to the characteristic of each external signal and design requirement other logical circuit, element or even combinational circuit.
Therefore, according to embodiments of the invention, can also carry out in conjunction with other external signals the on/off of control switch, and by the dropout part of neutral pole N, be driven the dropout of phase utmost point P, this has expanded the range of application of product greatly, and has improved the fail safe of product.
For example, when the voltage of the leading-out terminal of phase utmost point P is equal to or higher than predetermined voltage threshold, if detector 404 detects overvoltage signal, according to the result of logic and operation, controller still will trigger magnetictrip 401 with the neutral pole N dropout of pull switch 402, and the dropout part of neutral pole N drives phase utmost point P to thread off together.Like this, can make product avoid overvoltage, the impact such as under-voltage.
It should be noted in the discussion above that for clarity and conciseness, only show the part relevant to the embodiment of the present invention in Fig. 2 to Fig. 4, but it will be appreciated by those skilled in the art that, the equipment shown in Fig. 2 to Fig. 4 or device can comprise the unit that other are necessary.
Those of ordinary skills can recognize, the unit of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
In the several embodiment that provide in the application, should be understood that disclosed system and device can be realized by another way.For example, device embodiment described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, during actual realization, can have other dividing mode, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.
The described unit as separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, both can be positioned at a place, or also can be distributed in a plurality of network element.Can select according to the actual needs some or all of unit wherein to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can be also that the independent physics of unit exists, and also can be integrated in a unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, and also can adopt the form of SFU software functional unit to realize.
If the form of SFU software functional unit of usining described integrated unit realizes and during as production marketing independently or use, can be stored in a computer read/write memory medium.Understanding based on such, the all or part of of the part that technical scheme of the present invention contributes to prior art in essence in other words or this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CDs.
Also it is pointed out that in device of the present invention, obviously, each parts can decompose and/or reconfigure.These decomposition and/or reconfigure and should be considered as equivalents of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by the described protection range with claim.
Claims (19)
1. for a method for the trip free of the neutral pole of switch, it is characterized in that, described method comprises:
The voltage of the leading-out terminal of the phase utmost point of sense switch; And
Voltage based on this leading-out terminal triggers actuator, to control the trip status of the neutral pole of described switch.
2. method according to claim 1, is characterized in that, the described voltage based on this leading-out terminal triggers actuator, to control the process of trip status of the neutral pole of described switch, further comprises:
When the voltage of this leading-out terminal is equal to or higher than predetermined voltage threshold, does not trigger the neutral pole of actuator and described switch and do not thread off; And
When the voltage of this leading-out terminal is during lower than described predetermined voltage threshold, trigger actuator and thread off to control the neutral pole of described switch.
3. method according to claim 1, is characterized in that, described brake is magnetictrip.
4. method according to claim 1, is characterized in that, described method further comprises:
Detect external signal, and
The described voltage based on this leading-out terminal triggers actuator, to control the process of trip status of the neutral pole of described switch, further comprises:
Voltage and external signal based on this leading-out terminal trigger actuator, to control the trip status of the neutral pole of described switch.
5. method according to claim 4, is characterized in that, the process of described voltage based on this leading-out terminal and external signal further comprises carries out logic and operation by the voltage of this leading-out terminal and external signal.
6. method according to claim 5, is characterized in that, described external signal is one or more in overvoltage signal, under-voltage signal and shunt opening signal.
7. method according to claim 6, it is characterized in that, when the voltage of this leading-out terminal being detected and be equal to or higher than predetermined voltage threshold, if trigger brake according to the result of logic and operation, with the neutral pole of control switch, thread off, the dropout part of neutral pole drives the phase utmost point to thread off together.
8. method according to claim 7, is characterized in that, de-mouthful of part of described neutral pole is one side dropout part.
9. method according to claim 1, is characterized in that, when described switch has a plurality of phase utmost point, detects the voltage of the leading-out terminal of the phase utmost point that the neutral pole with described switch is close to.
10. for an equipment for the trip free of the neutral pole of switch, it is characterized in that, described equipment comprises:
Detector, for detection of the voltage of the leading-out terminal of the phase utmost point of switch;
Controller, triggers actuator for the voltage based on this leading-out terminal; And
Actuator, for controlling the trip status of the neutral pole of described switch under the control of described controller.
11. equipment according to claim 10, is characterized in that:
When the voltage that this leading-out terminal detected when described detector is equal to or higher than predetermined voltage threshold, described controller does not trigger actuator, and the neutral pole of described switch is not threaded off; And
The voltage that this leading-out terminal detected when described detector is during lower than described predetermined voltage threshold, and described controller triggers actuator, and the neutral pole that described actuator promotes described switch is threaded off.
12. equipment according to claim 10, is characterized in that, described brake is magnetictrip, and described controller is assembling printing board PCB A.
13. equipment according to claim 12, is characterized in that, the live wire of described PCBA is connected to the end of incoming cables of the phase utmost point of described switch, and the live wire of described magnetictrip and described PCBA is connected in series.
14. equipment according to claim 10, is characterized in that:
Described detector further detects external signal, and
Voltage and the external signal of described controller based on this leading-out terminal triggers actuator, to control the trip status of the neutral pole of described switch.
15. equipment according to claim 14, is characterized in that, described detector is and door.
16. equipment according to claim 15, is characterized in that, described external signal is one or more in overvoltage signal, under-voltage signal and shunt opening signal.
17. equipment according to claim 16, it is characterized in that, when the voltage that this leading-out terminal detected when described detector is equal to or higher than predetermined voltage threshold, if described controller triggers brake according to the operation result with door and threads off with the neutral pole of control switch, the dropout part of neutral pole drives the phase utmost point to thread off together.
18. equipment according to claim 17, is characterized in that, the dropout part of described neutral pole is one side dropout part.
19. equipment according to claim 10, is characterized in that, when described switch has a plurality of phase utmost point, described detector detects the voltage of the leading-out terminal of the phase utmost point that the neutral pole with described switch is close to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210294772.1A CN103595019B (en) | 2012-08-17 | 2012-08-17 | For the method and apparatus of the automatically jumping of the neutral pole of switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210294772.1A CN103595019B (en) | 2012-08-17 | 2012-08-17 | For the method and apparatus of the automatically jumping of the neutral pole of switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103595019A true CN103595019A (en) | 2014-02-19 |
| CN103595019B CN103595019B (en) | 2017-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210294772.1A Active CN103595019B (en) | 2012-08-17 | 2012-08-17 | For the method and apparatus of the automatically jumping of the neutral pole of switch |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2230060Y (en) * | 1995-06-22 | 1996-06-26 | 吴震宇 | Protective arrangement for neutral wire for disconnection |
| CN1477747A (en) * | 2002-07-18 | 2004-02-25 | 施耐德电器工业公司 | Apparatus for monitoring neutral wire and earth wire, and electric switch device containing the same |
| US20100102826A1 (en) * | 2006-11-24 | 2010-04-29 | Karl Nathan Edwards | Power supply monitoring system |
| CN202759215U (en) * | 2012-08-17 | 2013-02-27 | 施耐德电器工业公司 | Equipment used for free tripping neutral pole of switch |
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2012
- 2012-08-17 CN CN201210294772.1A patent/CN103595019B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2230060Y (en) * | 1995-06-22 | 1996-06-26 | 吴震宇 | Protective arrangement for neutral wire for disconnection |
| CN1477747A (en) * | 2002-07-18 | 2004-02-25 | 施耐德电器工业公司 | Apparatus for monitoring neutral wire and earth wire, and electric switch device containing the same |
| US20100102826A1 (en) * | 2006-11-24 | 2010-04-29 | Karl Nathan Edwards | Power supply monitoring system |
| CN202759215U (en) * | 2012-08-17 | 2013-02-27 | 施耐德电器工业公司 | Equipment used for free tripping neutral pole of switch |
Non-Patent Citations (1)
| Title |
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| 王勇等: "实现三相四线制供电系统中性线断线保护智能装置的研究", 《低压电器》 * |
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| CN103595019B (en) | 2017-07-07 |
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