CN207559538U - A kind of three-phase automatic reclosing device with wireless communication function - Google Patents
A kind of three-phase automatic reclosing device with wireless communication function Download PDFInfo
- Publication number
- CN207559538U CN207559538U CN201721880035.4U CN201721880035U CN207559538U CN 207559538 U CN207559538 U CN 207559538U CN 201721880035 U CN201721880035 U CN 201721880035U CN 207559538 U CN207559538 U CN 207559538U
- Authority
- CN
- China
- Prior art keywords
- module
- wireless communication
- connect
- automatic reclosing
- communication function
- 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.)
- Active
Links
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
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
-
- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The utility model discloses a kind of three-phase automatic reclosing devices with wireless communication function, including micro-control unit, the micro-control unit input terminal is connect with voltage detection module, current detection module, detection of electrical leakage module and switch power module, the micro-control unit output terminal is connect with relay driving module and wireless communication module, the relay driving module is connect with breaker module, the breaker module is connect with the input terminal of voltage detection module and current detection module, and the wireless communication module is also connect with FSU power ＆ environment supervision platforms.The utility model can be realized by FSU power ＆ environment supervisions platform and micro-control unit to remotely to the status monitoring and remote control of three phase mains auto recloser.
Description
Technical field
The utility model is related to mobile base station power protection fields, are to be related to a kind of band wireless communication function specifically
Three-phase automatic reclosing device.
Background technology
Mobile base station has very big available quantity, but traditional three-phase electricity for traditional three phase mains automatic safety device
Source automatic safety device does not have communication function or has the function of wire communication, in the comprehensive covering of base station signal of today and deeply
It spends under the overall situation of covering, the acquisition and monitoring for data are more and more important.How quickly and effectively to solve to three-phase
The remote real time monitoring of power supply automatic safety device and control, how to be easily installed under any base-station environment becomes current base station
The focal point of construction.
Utility model content
In order to solve the deficiencies in the prior art, the utility model provides a kind of three-phase with wireless communication function and weighs automatically
Closing device can be realized to remotely to the status monitoring and remote control of three phase mains auto recloser.
To achieve these goals, the technical solution of the utility model is as follows：
A kind of three-phase automatic reclosing device with wireless communication function, including micro-control unit, the micro-control unit
Input terminal is connect with voltage detection module, current detection module, detection of electrical leakage module and switch power module, the microcontroller list
First output terminal is connect with relay driving module and wireless communication module, and the relay driving module connects with breaker module
It connects, the breaker module is connect with the input terminal of voltage detection module, current detection module and detection of electrical leakage module, the nothing
Line communication module is also connect with FSU power ＆ environment supervision platforms.
Further, the relay driving module is also connect with switch power module.
Further, the switch power module is powered by a phases power cord in the three-phase electricity of the detected 380V in outside.
Further, 220V power supplys are converted into direct current 5V power supplys by the switch power module and direct current 24V power supplys are distinguished
It powers to relay driving module and micro-control unit.
Further, the wireless communication module includes wireless transmitter module and wireless receiving module, the wireless transmission
Module is RF433 transmitting modules, and the wireless receiving module is RF433 receiving modules.
Further, the breaker module includes two plastic housing magnetic protective breakers, and described two plastic housing magnetic protections are disconnected
Road device one is connect with mains supply, another connect with stand-by power supply.
Further, the breaker includes sequentially connected relay group and auxiliary contact.
Further, the auxiliary contact are contact button.
Further, real-time clock is equipped in the micro-control unit, the timing for being used to implement breaker module is opened automatically
It closes.
Further, the relay each two be one group, totally two groups, it is described per group relay respectively with an electronic behaviour
Make mechanism connection.
Detected a, b, c three phase mains is connected to the switch ends of electrically operated mechanism, there is electrically operated mechanism controls
It is detected a, b, c three phase mains break-make of circuit.
Further, the auto recloser further includes the LCD MODULE being connect with micro-control unit and instruction
Lamp.
Further, the switch power module is also connect with lightning-protection module.
Compared with prior art, the beneficial effects of the utility model are：
1) the utility model transmits the information of collected three phase mains automatic safety device by wireless communication module
Onto FSU power ＆ environment supervision platforms, solve the problems, such as the data monitoring of base station three phase mains protective device and difficult wiring or can not
The remote FSU data communications problem of wiring,
2) the utility model has long-range remote control function, can be long-range by FSU power ＆ environment supervisions platform and micro-control unit
Control the switching on and off operation of three phase mains automatic safety device.
3) the utility model uses micro-control unit, and collected overvoltage, under-voltage are detected by micro-control unit
Signal, overcurrent, short-circuit detection signal and detection of electrical leakage signal are analyzed and are handled, automatic by the way that relay is controlled to realize
Tripping and automatic closing.When failure occurs, load is protected in automatic trip；During troubleshooting, automatic closing facilitates dimension
Shield.The utility model efficiently solves the data collection problems that current most of base stations face, and can effectively save construction
Time and maintenance cost.
4) the utility model can rapidly cut off the power in 0.05 second in the case of electric leakage or short circuit, accident is avoided to send out
It is raw, it ensure that property and personal safety, 10 times faster than general air switch or fuse or more.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not form the improper restriction to the application for explaining the application.
Fig. 1 is the electrical block diagram of the utility model.
Wherein：1st, voltage detection module, 2, current detection module, 3, detection of electrical leakage module, 4, micro-control unit, 5, liquid crystal
Display unit, 6, switch power module, 7, relay driving module, 8, wireless communication module, 9, lightning-protection module, 10, relay
Group, 11, electrically operated mechanism, 12, auxiliary contact, 13, FSU power ＆ environment supervision modules.
Specific embodiment
The utility model is described further with specific embodiment below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.It is unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
In the utility model, term as " on ", " under ", "left", "right", "front", "rear", " vertical ", " level ",
The orientation or position relationship of the instructions such as " side ", " bottom " are based on orientation shown in the drawings or position relationship, only to facilitate chatting
State each component of the utility model or component structure relationship and determining relative, not refer in particular in the utility model either component or
Element, it is impossible to be construed as a limitation of the present invention.
In the utility model, term such as " affixed ", " connected ", " connection " should be interpreted broadly, and expression can be fixed
It connects or is integrally connected or is detachably connected；It can be directly connected, the indirect phase of intermediary can also be passed through
Even.Related scientific research or technical staff for this field can determine above-mentioned term in the utility model as the case may be
Concrete meaning, it is impossible to be construed as a limitation of the present invention.
As background technology is introduced, it is remote unattended to exist in the prior art most of mobile base station places, leads
The problem of base station is caused, which to be spaced apart after tripping, to be needed to send someone to on-site manual to restore, considerably increase maintenance cost, in order to solve as above
The technical issues of, present applicant proposes a kind of three-phase automatic reclosing devices with wireless communication function, can realize to long-range
To the status monitoring and remote control of three phase mains auto recloser.
As shown in Figure 1, a kind of three-phase automatic reclosing device with wireless communication function, including micro-control unit (4), institute
State micro-control unit (4) input terminal and voltage detection module (1), current detection module (2), detection of electrical leakage module (3) and switch
Power module (6) connects, and micro-control unit (4) output terminal connects with relay driving module (7) and wireless communication module (8)
It connects, the relay driving module (7) connect with breaker module, the breaker module and voltage detection module (1), electric current
Detection module (2) is connected with the input terminal of detection of electrical leakage module (3), and the wireless communication module (8) is also put down with FSU power ＆ environment supervisions
Platform (13) connects.
The micro-control unit (4), relay group (10) and auxiliary contact (12) form closed loop.
The voltage detection module (1) is detected circuit overvoltage and under-voltage, and current detection module (2) is to circuit
Overcurrent and short circuit are detected, and detection of electrical leakage module (3) is detected circuit leaky, and above-mentioned detection signal is sent
It is analyzed and is handled to micro- unit (4) processed.
The relay driving module (7) also connect with switch power module (6).
The switch power module (6) is powered by a phases power cord in the three-phase electricity of external 380V.The Switching Power Supply mould
220V power supplys are converted into direct current 5V power supplys and direct current 24V power supplys respectively to relay driving module (7) and microcontroller list by block (6)
First (4) power supply.
The wireless communication module (8) includes wireless transmitter module and wireless receiving module, and the wireless transmitter module is
RF433 transmitting modules, the wireless receiving module are RF433 receiving modules.FSU power ＆ environment supervisions platform (13) passes through wireless telecommunications
Module (8) is connect with micro-control unit (4) carries out on-line parameter setting, and micro-control unit (4) is FSU power ＆ environment supervisions platform (13)
Electrical source of power environmental monitoring data is provided, including the related electrics failure ginseng such as overvoltage, under-voltage, overcurrent/short circuit and electric leakage
Number.
The breaker module includes two plastic housing magnetic protective breakers, described two plastic housing magnetic protective breakers one with
Mains supply connects, another connect (not shown in figure 1) with stand-by power supply.
The breaker is connected in three-phase line, including sequentially connected relay group (10) and auxiliary contact (12).
The relay group (10) connect with relay driving module (7), the auxiliary contact (12) and voltage detection module (1), electricity
Stream detection module (2) is connected with the input terminal of detection of electrical leakage module (3).
The auxiliary contact (12) are contact button, it provides voltage, electric current, leakage data for micro-control unit (4)
With normally closed, the normally opened signal of breaker, for determining the opening and closing state of breaker.
Relay (10) each two be one group, totally two groups, it is described per group relay (10) respectively with an electronic behaviour
Make mechanism (11) connection, the motor-operating mechanism (11) pushes breaker actuation.
Detected a, b, c three phase mains is connected to the switch ends of electrically operated mechanism (11), there is electrically operated mechanism
(11) a, b, c the three phase mains break-make for being detected circuit are controlled.
In Fig. 1, a, b, c, n represent a phases electricity, b phases electricity, c phases electricity and the n zero curves of detection three phase mains.
Relay is actually a kind of automatic switch that control larger current is gone with smaller electric current, is played in circuit certainly
The effects that dynamic adjusting, safeguard protection and conversion circuit.When input quantity (such as voltage, electric current) reaches specified value, can make by
The output circuit of control is turned on or off, and has many advantages, such as that action is fast, the operation is stable, service life are long and small, had
The defencive function of the essential electricals failures such as voltage, under-voltage, overcurrent/short circuit and electric leakage, in the case where there is abnormal electrical power supply,
It can rapidly cut off the power in 0.05 second, can occur to avoid accident, ensure that property and personal safety, be opened than general air
Pass or fast 10 times of fuse or more.
Real-time clock is equipped in the micro-control unit (4), is used to implement the time switch of breaker module.
The auto recloser further includes the LCD MODULE (5) and indicator light being connect with micro-control unit (4).
The switch power module (6) also connect with lightning-protection module (9).
The utility model by micro-control unit (4) control main switch be closed before, can to supply voltage, equipment leakage or
Load short circuits failure is detected, and has " being detected before closing a floodgate " function.It and in the process of running, can be to supply voltage and mistake
The failures such as load, short circuit, electric leakage carry out tracing detection, send out to instruct when breaking down and cut off the power in time, are more pacified using electricity
It is complete reliable；Simultaneously by the one group of status indicator lamp set up, fault condition is shown, provided conveniently for line maintenance.
The utility model is suitable for exchanging 50Hz, rated operational voltage 400V, and the circuit of rated current to 0-250A can be used
It is used as the protective devices such as circuit and power-supply device overload, short circuit, electric leakage, overvoltage, under-voltage and it has automatic reclosing
Function ensure that the continuity of power supply.
The utility model is for the specific protection content of circuit：
(1) short-circuit protection：Short circuit occurs for circuit, if continuing 0.5 second, circuit can be caused to burn.If the energy in 0.1 second
It cuts off the power rapidly, can occur to avoid accident.Automatic reclosing leakage protection switch is more than 5 times of rated current in electric current
When, it can be disconnected in 0.03 second, 10 times faster than general air switch or fuse or more, ensure that the safety of equipment.
(2) earth leakage protective：When 15~30 milliamperes of electric leakage or person electric shock occurs for circuit, automatic reclosing earth leakage protective is opened
Pass disconnected in 0.03 second, ensure that personal safety.
(3) overcurrent protection：If line load is overweight, electric wire seriously generates heat, it is likely that causes fire.When electric current is more than volume
During 1.15 times of constant current, duration and size that automatic reclosing leakage protection switch will monitor this electric current；If continued
Between more than 3 seconds or period be more than 5 times of rated current, automatic reclosing leakage protection switch i.e. disconnect implement protection.
(4) overvoltage protection：Voltage is too high, easily burns out equipment, when supply voltage is higher than 280V, automatic reclosing electric leakage
Protection switch disconnects, and after voltage drops back to normally, automatic reclosing leakage protection switch automatic closing is powered.
(5) under-voltage protection：Voltage is too high no doubt dangerous, and brownout also easily causes equipment Fraquent start, is directed at equipment
Damage, when supply voltage is less than 100V, automatic reclosing leakage protection switch disconnects, voltage recovery normally rear automatic reclosing leakage
Electric protective circuit breaker automatic closing is powered.
(6) it is disconnected automatically when powering off：It is automatic to disconnect input and outlet line when circuit powers off, it avoids and sends a telegram here again
When, it is abnormal due to powering, make what electric appliance burnt to happen.When sending a telegram here again, if power supply is normal, automatic closing leads to
Electricity.
(7) it is detected before closing a floodgate：Automatic reclosing leakage protection switch is detected circuit before combined floodgate, if power supply electricity
When reduce off-flavor normal (excessively high, too low), circuit have electric leakage or short-circuit conditions, block is closed a floodgate and alarmed；User such as repairs not in time,
Failure is without excluding, then can not close a floodgate energization, and the generation of accident is prevented before accident generation.
(8) Intelligent electric leakage identifies：Leakage current test module has leakage current intelligent identification technology, can recognize that various interference letters
Number and electric leakage signal, virtual leak electric tripping can be avoided.
(9) automatic reclosing：Circuit occurs moment electric leakage or moment impact (such as thunder and lightning, socket arcing) and may have danger
When dangerous, automatic reclosing leakage protection switch disconnects immediately；After impact, if circuit is still safe, automatic reclosing
Earth leakage circuit-breaker can close a floodgate energization again automatically.Continuous reclosing 3 times (time interval is respectively 30 seconds, 0.5 hour, it is 1 small
When) after, automatic reclosing leakage protection switch will be switched off and alarm." automatic reclosing " is automatic reclosing leakage protection switch
The function of adding, reduces manual closing operation, ensures the continuity of electricity consumption, improves operation ratio, makes user more convenient.
(10) timing and remote control：Inside has clock, it can be achieved that time switch, has wireless transport module, can
It is communicated with long distance wireless and FSU, realizes that teledata is monitored and controlled, reduce maintenance cost.
(11) fault alarm：While above-mentioned protection disconnects, the indicator light of different colours is bright, is used to indicate corresponding failure
Type.
The foregoing is merely the preferred embodiments of the application, are not limited to the application, for the skill of this field
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but not to this practicality newly
The limitation of type protection domain, those skilled in the art should understand that, on the basis of the technical solution of the utility model, ability
Field technique personnel do not need to make the creative labor the various modifications or changes that can be made still in the protection model of the utility model
Within enclosing.
Claims (10)
1. a kind of three-phase automatic reclosing device with wireless communication function, it is characterised in that：It is described micro- including micro-control unit
Control unit input terminal is connect with voltage detection module, current detection module, detection of electrical leakage module and switch power module, described
Micro-control unit output terminal is connect with relay driving module and wireless communication module, the relay driving module and breaker
Module connects, and the breaker module is connect with the input terminal of voltage detection module, current detection module and detection of electrical leakage module,
The wireless communication module is also connect with FSU power ＆ environment supervision platforms.
2. a kind of three-phase automatic reclosing device with wireless communication function as described in claim 1, which is characterized in that described
Relay driving module also connects with switch power module.
3. a kind of three-phase automatic reclosing device with wireless communication function as described in claim 1, which is characterized in that described
Switch power module is powered by a phases power cord in the three-phase electricity of external 380V, and the switch power module turns 220V power supplys
Direct current 5V power supplys and direct current 24V power supplys is changed into power to relay driving module and micro-control unit respectively.
4. a kind of three-phase automatic reclosing device with wireless communication function as described in claim 1, which is characterized in that described
Real-time clock is equipped in micro-control unit, is used to implement the time switch of breaker module.
5. a kind of three-phase automatic reclosing device with wireless communication function as described in claim 1, which is characterized in that described
Wireless communication module include wireless transmitter module and wireless receiving module, the wireless transmitter module be RF433 transmitting modules, institute
Wireless receiving module is stated as RF433 receiving modules.
6. a kind of three-phase automatic reclosing device with wireless communication function as described in claim 1, which is characterized in that described
Breaker module includes two plastic housing magnetic protective breakers, and described two plastic housing magnetic protective breakers one connect with mains supply
It connects, another connect with stand-by power supply.
7. a kind of three-phase automatic reclosing device with wireless communication function as described in claim 1, which is characterized in that described
Breaker includes sequentially connected relay group and auxiliary contact, and the auxiliary contact are contact button.
8. a kind of three-phase automatic reclosing device with wireless communication function as claimed in claim 7, which is characterized in that described
Relay each two is one group, totally two groups, described to be connect respectively with a motor-operating mechanism per group relay.
9. a kind of three-phase automatic reclosing device with wireless communication function as described in claim 1, which is characterized in that described
Auto recloser further includes the LCD MODULE and indicator light being connect with micro-control unit.
A kind of 10. three-phase automatic reclosing device with wireless communication function as described in claim 1, which is characterized in that institute
Switch power module is stated also to connect with lightning-protection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721880035.4U CN207559538U (en) | 2017-12-28 | 2017-12-28 | A kind of three-phase automatic reclosing device with wireless communication function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721880035.4U CN207559538U (en) | 2017-12-28 | 2017-12-28 | A kind of three-phase automatic reclosing device with wireless communication function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207559538U true CN207559538U (en) | 2018-06-29 |
Family
ID=62660697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721880035.4U Active CN207559538U (en) | 2017-12-28 | 2017-12-28 | A kind of three-phase automatic reclosing device with wireless communication function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207559538U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031723A (en) * | 2019-04-24 | 2019-07-19 | 袁超 | The intelligent switch and its detection method of line fault are detected before a kind of combined floodgate |
-
2017
- 2017-12-28 CN CN201721880035.4U patent/CN207559538U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031723A (en) * | 2019-04-24 | 2019-07-19 | 袁超 | The intelligent switch and its detection method of line fault are detected before a kind of combined floodgate |
| CN110031723B (en) * | 2019-04-24 | 2022-04-01 | 袁超 | Intelligent switch for detecting line fault before closing and detection method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201656420U (en) | Three-phase auto reclosing electricity leakage protection switch | |
| CN208478943U (en) | A kind of remote control intelligent household distribution box | |
| CN202663087U (en) | Smart protector for motor | |
| CN102005720B (en) | Neutral line breakage detection protection method and device | |
| CN204481568U (en) | A kind of power plant is standby throws protective device | |
| CN202586259U (en) | Minisize intelligent electric leakage comprehensive protection switch | |
| CN207559538U (en) | A kind of three-phase automatic reclosing device with wireless communication function | |
| CN203242926U (en) | Low-voltage power distribution cabinet with residual current protection function | |
| CN202917961U (en) | Self-recovery type over-voltage and under-voltage protection circuit breaker | |
| CN204947341U (en) | Distribution becomes platform intelligent distribution box | |
| CN210328309U (en) | Data center computer room network cabinet | |
| CN201616596U (en) | Single-phase intelligent type alternating-current distribution box | |
| CN206806982U (en) | A kind of three-phase four-wire power phase shortage and phase sequence warning device | |
| CN111200272A (en) | Intelligent plastic shell type circuit breaker and control method thereof | |
| CN205881836U (en) | Electronic type time relay switching -on device that delays | |
| CN101340070A (en) | Overhead power line capable of automatically protecting and preventing icing and automatically melting ice | |
| CN201038735Y (en) | Locking and interlocking device for coal mine main draught fan and down-hole power supply | |
| CN102196626B (en) | Intelligent control device of street lamp transformer | |
| CN204314645U (en) | A kind of low-voltage distribution system by screen break-make automaton | |
| CN203911498U (en) | Distributed photovoltaic grid-connected protective equipment | |
| CN112290548A (en) | Automatic switching-on and switching-off device of distribution transformer for agricultural distribution network alternating current ice melting | |
| CN111725895A (en) | Transformer intelligent terminal | |
| CN105119150A (en) | Fuse type isolation switch cabinet | |
| CN202153632U (en) | Automatic reclosing power supply protector of communication system | |
| CN201797299U (en) | Reverse-power relay |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |