CN102866350A - Detection method and detection device of automatic changeover switch electric appliance - Google Patents
Detection method and detection device of automatic changeover switch electric appliance Download PDFInfo
- Publication number
- CN102866350A CN102866350A CN2012103334819A CN201210333481A CN102866350A CN 102866350 A CN102866350 A CN 102866350A CN 2012103334819 A CN2012103334819 A CN 2012103334819A CN 201210333481 A CN201210333481 A CN 201210333481A CN 102866350 A CN102866350 A CN 102866350A
- Authority
- CN
- China
- Prior art keywords
- power supply
- commonly used
- sampling module
- standby power
- electric appliance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Landscapes
- Dc-Dc Converters (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention provides a detection method and a detection device of an automatic changeover switch electric appliance. The device comprises an internal power supply, a frequently-used power supply sampling module, a standby power supply sampling module and an isolation communication module, wherein the frequently-used power supply sampling module is connected with a frequently-used power supply; the standby power supply sampling module is connected with a standby power supply; the frequently-used power supply sampling module is connected with the standby power supply sampling module by isolating the isolation communication module; and the internal power supply comprises two groups of power supplies which are electrically isolated from each other through the isolation communication module. According to the invention, two singlechips are respectively used for sampling two paths of power supplies respectively, and information is transmitted between the two singlechips by a photoelectric coupler in an isolation manner. The traditional method by utilizing a single chip microprocessor to sample two circuits of power supplies is changed, and the electrical isolation in the sampling process can be avoided. The sampling detection time is shortened; and the sampling precision is guaranteed, and the environmental influence can be avoided. Finally the detection precision of the automatic changeover switch electric appliance and the power supply changeover speed can be improved.
Description
Technical field
The present invention relates to Low Voltage Electrical Apparatus, relate in particular to a kind of detection method and device of automatic transfer switching electric appliance.
Background technology
At the important place that does not allow to cut off the power supply, for guaranteeing the continuity of electric power safety and production, usually adopt the double loop power supply power supply, switch one tunnel normal power supply access user load by automatic transfer switching electric appliance.Automatic transfer switching electric appliance comprises controller and topworks, and controller comprises pick-up unit, can detect simultaneously the two-way power supply, judges according to the parameter that the user sets whether power supply is normal, then controls topworks and switches.The power supply of two-way access controller will be isolated mutually.
Pick-up unit of the prior art is general to adopt a single-chip microcomputer that the two-way power supply is sampled, therefore in sampling process, just must carry out electrical isolation to this two-way power supply, the method of electrical isolation sampling has photoelectric coupler isolation sampling and mutual inductor sample, and wherein the photoelectric coupler isolation sampling can be adopted nonlinear optical electric coupler and precision photoelectric coupler.
Because cost is low, volume is little, the most frequently used is to adopt non-linear photoelectric coupler isolation sampling.The temperature of nonlinear optical electric coupler is floated seriously, and therefore the precision of sampling can't guarantee, and is high if the setup parameter of controller requires, and then might cause the misoperation of automatic transfer switching electric appliance; And adopt precision photoelectric coupler and mutual inductor sample, can guarantee linear sampling precision, but cost is higher and volume is large, so can not be widely used.
Prior art all adopts this use a slice single-chip microcomputer at present, and the detection method of isolating when sampling because isolation is placed in the sampling process, has affected sampling precision, and prior art does not also have the low way of a kind of better solution sampling precision.
Summary of the invention
The invention provides a kind of detection method and device that can be used for automatic transfer switching electric appliance, to guarantee improving sampling precision in the basis realization that does not increase cost.Described technical scheme is as follows:
A kind of pick-up unit of automatic transfer switching electric appliance comprises power supply sampling module commonly used, standby power supply sampling module, isolation communication module, internal electric source:
Described power supply sampling module commonly used is connected with described power supply commonly used; Described standby power supply sampling module is connected with described standby power supply; Described power supply sampling module commonly used and described standby power supply sampling module are connected after by described isolation communication module isolation; Internal electric source comprises power supply one and power supply two, described power supply one and power supply two are by described isolation communication module electrical isolation, described power supply one is connected with described power supply sampling module commonly used, be described power supply sampling module power supply commonly used, power supply two is connected with described standby power supply sampling module, is described standby power supply sampling module power supply.
Further, described power supply sampling module commonly used and standby power supply sampling module all comprise peripheral sampling circuit and single-chip microcomputer separately.The peripheral sampling circuit input end of power supply sampling module commonly used is connected with described power supply commonly used, and output is connected with host scm, to described power supply sampling commonly used; The peripheral sampling circuit input end of described standby power supply sampling module is connected with described standby power supply, and output terminal is connected with auxiliary single-chip microcomputer, to described standby power supply sampling.
Further, described isolation communication module comprises photoelectrical coupler.
Further, described host scm is in order to detect power supply commonly used and to realize the control automatic transfer switching electric appliance, and auxiliary single-chip microcomputer is in order to detect standby power supply.
Further, described host scm and auxiliary single-chip microcomputer adopt NXP series.
A kind of detection method of automatic transfer switching electric appliance comprises:
The peripheral sample circuit of power supply sampling module commonly used is to power supply sampling commonly used, and the information of described power supply commonly used is passed to host scm; The peripheral sample circuit of standby power supply sampling module is sampled to standby power supply, and the information of described standby power supply is passed to auxiliary single-chip microcomputer; The power supply of described host scm and the power supply of described auxiliary single-chip microcomputer are by the photoelectrical coupler electrical isolation;
Described host scm is set the instruction of setting parameter, electrical isolation through photoelectrical coupler, the setting parameter information that described host scm is sent passes to auxiliary single-chip microcomputer, described auxiliary single-chip microcomputer is according to the information of the described standby power supply of command detection that receives, and judge the state of described standby power supply, the status information of described standby power supply passes to host scm through the electrical isolation of described photoelectrical coupler; Described host scm produces the signal of control automatic transfer switching electric appliance according to the status information of power supply commonly used and the status information of standby power supply.
Further, described power supply commonly used and described standby power supply are independently three phase worker power of two-way.
Further, the information of described power supply commonly used and described standby power supply comprises the information of voltage and phase place.
Further, described user's setting parameter information sent by certain cycle.
Further, be added with check code in the described communication data, to guarantee the correctness of data transmission.
The technical scheme that the embodiment of the invention provides is by using two single-chip microcomputers, each one road power supply of sampling, host scm detects power supply commonly used, and responsible electrical source exchange controls, adjusts and show that auxiliary single-chip microcomputer detects standby power supply, between two single-chip microcomputers by photoelectric coupler isolation communication, transmission of information.Changed and used a slice single-chip microcomputer to the method for two-way power supply sampling in the classic method, avoided in sampling process, carrying out electrical isolation.Make the sample detecting time shorten; Guarantee sampling precision, not affected by environment.Finally realized improving precision, the raising electrical source exchange speed that automatic transfer switching electric appliance detects.
Description of drawings
Fig. 1 is the pick-up unit system function module block diagram of the automatic transfer switching electric appliance that provides of the embodiment of the invention;
Fig. 2 is the pick-up unit circuit diagram of the automatic transfer switching electric appliance that provides of the embodiment of the invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.Be understandable that specific embodiment described herein only is used for explaining the present invention, but not limitation of the invention.
Embodiment
Fig. 1 is the system function module block diagram of the pick-up unit of automatic transfer switching electric appliance.Present embodiment provides a kind of pick-up unit of automatic transfer switching electric appliance, and as shown in Figure 1, the pick-up unit of this automatic transfer switching electric appliance comprises power supply sampling module 201 commonly used, standby power supply sampling module 202, internal electric source 203, isolation communication module 204.
Power supply sampling module 201 commonly used is connected with power supply commonly used; Standby power supply sampling module 202 is connected with standby power supply; Power supply sampling module 201 commonly used is connected after isolating communication module 204 isolation with standby power supply sampling module 202; Internal electric source 203 comprises D.C. regulated power supply one and power supply two, and voltage is 3.3V, is respectively single-chip microcomputer and powers separately.Power supply one and power supply two are by isolation communication module 204 electrical isolation, and power supply one is connected with power supply sampling module 201 commonly used, are power supply sampling module power supply commonly used, and power supply two is connected with standby power supply sampling module 202, is the power supply of standby power supply sampling module.
Power supply sampling module 201 commonly used and standby power supply sampling module 202 all comprise single-chip microcomputer and peripheral sampling circuit separately, wherein single-chip microcomputer is core component, the single-chip microcomputer of power supply sampling module 201 commonly used is as host scm, in order to detect power supply commonly used and to realize the control automatic transfer switching electric appliance, the single-chip microcomputer of standby power supply sampling module 202 is as auxiliary single-chip microcomputer, in order to detect standby power supply.The peripheral sampling circuit input end of power supply sampling module 201 commonly used is connected with power supply commonly used, and output is connected with host scm; The input end of the peripheral sampling circuit of standby power supply sampling module 202 is connected with standby power supply, and output terminal is connected with auxiliary single-chip microcomputer.
At first, peripheral sample circuit is sampled to power supply commonly used and standby power supply, power supply commonly used and standby power supply are three phase worker power, the power supply commonly used that gathers and the information of standby power supply comprise the information of voltage and phase place, three phase worker power has A, B, C three with live wire and a zero line, an alternating current is sampled at every turn, makes alternating current become direct current by half-wave rectification, make galvanic lower voltage through dividing potential drop, conversion converts analog quantity to digital quantity through A/D again.To after the alternating current sampling, successively other two alternating currents are sampled again at every turn.The power information that obtains is passed to respectively two single-chip microcomputers, and the information of power supply commonly used passes to host scm, and the information of standby power supply passes to auxiliary single-chip microcomputer.
The user sets the instruction of setting parameter, by the electrical isolation of host scm by photoelectrical coupler, passes to auxiliary single-chip microcomputer, and every 100mS sends once.Auxiliary single-chip microcomputer is according to the instruction of setting parameter, and the electrical isolation by photoelectrical coupler sends the status information of standby power supply to host scm, sends once every a power frequency period 20mS.In order to ensure the correctness of data transmission, add check code in the communication data.
Host scm judges according to the state of power supply commonly used and the state of standby power supply, produces control signal, and the control automatic transfer switching electric appliance arrives the switch gear switch in place.The state of power supply is divided into normal and undesired, undesired have open circuit, overvoltage and under-voltage several situation.For example opening circuit appears in power supply commonly used, and overvoltage or under-voltage state will the cut-in stand-by Power supplies, if two power supplys all go wrong, power supply will be cut off.
Fig. 2 is the circuit diagram of the pick-up unit of automatic transfer switching electric appliance.As shown in Figure 2:
Peripheral sampling circuit has 6 the tunnel, wherein has 3 the tunnel to be connected with power supply commonly used with host scm, and other 3 the tunnel are connected with standby power supply with auxiliary single-chip microcomputer, and this 6 line structure composition is all identical.Take standby power supply C mutually as example:
Voltage dependent resistor (VDR) RV4 one end connects standby power supply C phase RC, and the other end connects standby power supply neutral line RN, is used for to anti-lightning and surge the protection sample circuit; Commutation diode D15 is used for half-wave rectification; Resistance R 53 and R61 form bleeder circuit, and detected voltage is down to the voltage range that single-chip microcomputer U11 allows sampling, and the precision of divider resistance is 1%, can guarantee sampling precision; Resistance R 60 and capacitor C 28 form the RC firstorder filter, in order to filtering interference signals; D8 is in order to voltage stabilizing, and the voltage signal that protection is sampled does not damage single-chip microcomputer U11; The ground wire of host scm U4 links to each other with power supply neutral line NN commonly used, and the ground wire of auxiliary single-chip microcomputer U11 links to each other with standby power supply neutral line RN; Host scm and auxiliary single-chip microcomputer have adopted the NXP series monolithic.
Adopted photoelectrical coupler U12 and U7 to isolate communication between two single-chip microcomputers.Power supply one is the dc power supply of host scm, and power supply two is the dc power supply of auxiliary single-chip microcomputer, and supply voltage is 3.3V.
The setting parameter Information Conduction that photoelectrical coupler U12 sends host scm U4 is given auxiliary single-chip microcomputer U11, and auxiliary single-chip microcomputer U11 is according to the command detection standby power supply that receives, and the state of standby power supply is conducted to host scm U4 through photoelectrical coupler U7.The every 100mS of host scm U4 sends user data of adjusting to auxiliary single-chip microcomputer U11, and auxiliary single-chip microcomputer U11 sends the data of a byte, report standby power supply state every a power frequency period (20mS) to host scm U4.
The photoelectrical coupler temperature is floated impact is the conduction multiple of isolation both sides, and on the simulating signal impact greatly, digital signal is unaffected, so the communication of single-chip microcomputer U4 and U11 temperature influence not.The voltage that is sampled is converted to effective value by single-chip microcomputer and judges power supply status, and adopting the advantage of effective value is that antijamming capability is strong, and the communication data of single-chip microcomputer U4 and U11 is added with check code, guarantees the correctness of data transmission.
The embodiment of the invention is by using two single-chip microcomputers, each one road power supply of sampling, between two single-chip microcomputers by the photoelectrical coupler electrical isolation.Changed and used a slice single-chip microcomputer to the method for two-way power supply sampling in the classic method, avoided in sampling process, carrying out electrical isolation.Make the sample detecting time shorten; Guarantee sampling precision, not affected by environment.Finally realized improving precision, the raising electrical source exchange speed that automatic transfer switching electric appliance detects.
It below only is the explanation of doing for the preferred embodiments of the present invention and know-why thereof; and be not the restriction that technology contents of the present invention is carried out; anyly be familiar with those skilled in the art in technical scope disclosed in this invention; the variation of being expected easily or replacement all should be encompassed in protection scope of the present invention.
Claims (10)
1. the pick-up unit of an automatic transfer switching electric appliance comprises power supply sampling module commonly used, standby power supply sampling module, isolation communication module, internal electric source, it is characterized in that:
Described power supply sampling module commonly used is connected with described power supply commonly used; Described standby power supply sampling module is connected with described standby power supply; Described power supply sampling module commonly used and described standby power supply sampling module are connected after by described isolation communication module isolation; Internal electric source comprises power supply one and power supply two, described power supply one and power supply two are by described isolation communication module electrical isolation, described power supply one is connected with described power supply sampling module commonly used, be described power supply sampling module power supply commonly used, power supply two is connected with described standby power supply sampling module, is described standby power supply sampling module power supply.
2. the pick-up unit of automatic transfer switching electric appliance according to claim 1 is characterized in that, described power supply sampling module commonly used and standby power supply sampling module all comprise peripheral sampling circuit and single-chip microcomputer separately.The peripheral sampling circuit input end of power supply sampling module commonly used is connected with described power supply commonly used, and output is connected with host scm, to described power supply sampling commonly used; The peripheral sampling circuit input end of described standby power supply sampling module is connected with described standby power supply, and output terminal is connected with auxiliary single-chip microcomputer, to described standby power supply sampling.
3. the pick-up unit of automatic transfer switching electric appliance according to claim 1 is characterized in that, described isolation communication module comprises photoelectrical coupler.
4. the pick-up unit of automatic transfer switching electric appliance according to claim 1 is characterized in that, described host scm is in order to detect power supply commonly used and to realize the control automatic transfer switching electric appliance, and auxiliary single-chip microcomputer is in order to detect standby power supply.
5. the pick-up unit of automatic transfer switching electric appliance according to claim 1 is characterized in that, described host scm and auxiliary single-chip microcomputer adopt NXP series.
6. the detection method of an automatic transfer switching electric appliance is characterized in that:
The peripheral sample circuit of power supply sampling module commonly used is to power supply sampling commonly used, and the information of described power supply commonly used is passed to host scm; The peripheral sample circuit of standby power supply sampling module is sampled to standby power supply, and the information of described standby power supply is passed to auxiliary single-chip microcomputer; The power supply of described host scm and the power supply of described auxiliary single-chip microcomputer are by the photoelectrical coupler electrical isolation;
Described host scm is set the instruction of setting parameter, electrical isolation through photoelectrical coupler, the setting parameter information that described host scm is sent passes to auxiliary single-chip microcomputer, described auxiliary single-chip microcomputer is according to the information of the described standby power supply of command detection that receives, and judge the state of described standby power supply, the status information of described standby power supply passes to host scm through the electrical isolation of described photoelectrical coupler; Described host scm produces the signal of control automatic transfer switching electric appliance according to the status information of power supply commonly used and the status information of standby power supply.
7. the detection method of automatic transfer switching electric appliance according to claim 6 is characterized in that, described power supply commonly used and described standby power supply are independently three phase worker power of two-way.
8. the detection method of automatic transfer switching electric appliance according to claim 6 is characterized in that, the information of described power supply commonly used and described standby power supply comprises the information of voltage and phase place.
9. the detection method of automatic transfer switching electric appliance according to claim 6 is characterized in that, described user's setting parameter information sent by certain cycle.
10. the detection method of automatic transfer switching electric appliance according to claim 6 is characterized in that, is added with check code in the described communication data, to guarantee the correctness of data transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210333481.9A CN102866350B (en) | 2012-09-10 | 2012-09-10 | The detection method of automatic transfer switching electric appliance and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210333481.9A CN102866350B (en) | 2012-09-10 | 2012-09-10 | The detection method of automatic transfer switching electric appliance and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102866350A true CN102866350A (en) | 2013-01-09 |
| CN102866350B CN102866350B (en) | 2015-12-09 |
Family
ID=47445338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210333481.9A Active CN102866350B (en) | 2012-09-10 | 2012-09-10 | The detection method of automatic transfer switching electric appliance and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102866350B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678759A (en) * | 2013-11-26 | 2015-06-03 | 西安恒飞电子科技有限公司 | Master-slave controller circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202005017997U1 (en) * | 2005-11-15 | 2006-03-30 | Ean Elektroschaltanlagen Gmbh | Voltage switching arrangement for information technology network in safety-critical applications, especially in hospitals, has control software used to coil switching currents |
| CN200950553Y (en) * | 2006-06-04 | 2007-09-19 | 赵希平 | Circuit apparatus for intelligent dual-power supply automatic converting switch |
| CN201263097Y (en) * | 2008-08-19 | 2009-06-24 | 深圳市宝安任达电器实业有限公司 | Intelligent automatic changeover switch electric appliance |
| CN201360174Y (en) * | 2009-01-20 | 2009-12-09 | 南京全乐科技有限公司 | Quick duplicate supply switching unit |
| CN201417302Y (en) * | 2009-06-09 | 2010-03-03 | 陕西海博瑞德微电子有限公司 | Intelligent power supply monitoring module |
| CN102608404A (en) * | 2012-03-13 | 2012-07-25 | 上海诺雅克电气有限公司 | Voltage sampling circuit and controller applicable to dual-power automatic transfer switch |
-
2012
- 2012-09-10 CN CN201210333481.9A patent/CN102866350B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202005017997U1 (en) * | 2005-11-15 | 2006-03-30 | Ean Elektroschaltanlagen Gmbh | Voltage switching arrangement for information technology network in safety-critical applications, especially in hospitals, has control software used to coil switching currents |
| CN200950553Y (en) * | 2006-06-04 | 2007-09-19 | 赵希平 | Circuit apparatus for intelligent dual-power supply automatic converting switch |
| CN201263097Y (en) * | 2008-08-19 | 2009-06-24 | 深圳市宝安任达电器实业有限公司 | Intelligent automatic changeover switch electric appliance |
| CN201360174Y (en) * | 2009-01-20 | 2009-12-09 | 南京全乐科技有限公司 | Quick duplicate supply switching unit |
| CN201417302Y (en) * | 2009-06-09 | 2010-03-03 | 陕西海博瑞德微电子有限公司 | Intelligent power supply monitoring module |
| CN102608404A (en) * | 2012-03-13 | 2012-07-25 | 上海诺雅克电气有限公司 | Voltage sampling circuit and controller applicable to dual-power automatic transfer switch |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678759A (en) * | 2013-11-26 | 2015-06-03 | 西安恒飞电子科技有限公司 | Master-slave controller circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102866350B (en) | 2015-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103516052A (en) | Power distribution equipment on-line monitoring early-warning terminal | |
| US9679726B2 (en) | Anti-interference switch signal transmission circuit | |
| CN103457358B (en) | Controller switching equipment operating mode on-line monitoring early warning system | |
| CN207504768U (en) | Solid-state power controller | |
| CN113241740A (en) | Solid-state circuit breaker with arc fault protection | |
| CN103513154A (en) | Power distribution network electric leakage signal on-line detection device | |
| CN109194245A (en) | A kind of servo-driver and its detection method with input phase failure detection function | |
| CN103701141A (en) | Novel multifunctional coding switch | |
| CN104267222A (en) | IGCT-based direct current network voltage sudden change testing device and application method thereof | |
| CN107645167B (en) | Reactive compensation control method for power distribution network | |
| CN203839956U (en) | Novel multifunctional encoder | |
| CN102866350A (en) | Detection method and detection device of automatic changeover switch electric appliance | |
| CN204118852U (en) | Power transfer device | |
| CN105577162A (en) | Digital quantity output unit and digital quantity output board card | |
| CN205610225U (en) | Transformer excess load automatic switching control equipment | |
| CN203561715U (en) | Power distribution network electric leakage signal on-line detection device | |
| CN204517786U (en) | Digital output unit and digital output card | |
| CN203504294U (en) | Online monitoring early-warning system of operating conditions of power distribution equipment | |
| CN203261125U (en) | Self-powered digital relay | |
| CN203839954U (en) | Novel multifunctional code switch with temperature control function | |
| CN203871921U (en) | Intelligent medium voltage switchgear | |
| CN206698020U (en) | A kind of tele-control system of breaker | |
| CN103499790A (en) | Online detection device for switching-on/off state of power distribution network | |
| CN204882757U (en) | Distribution network automation electric power instrument | |
| CN106410658B (en) | A kind of electronic type of distribution terminal is anti-jump and switching on and off monitoring arrangement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |