CN104459496A - 220kV long cable voltage withstand test wireless control system and control method thereof - Google Patents
220kV long cable voltage withstand test wireless control system and control method thereof Download PDFInfo
- Publication number
- CN104459496A CN104459496A CN201410792312.0A CN201410792312A CN104459496A CN 104459496 A CN104459496 A CN 104459496A CN 201410792312 A CN201410792312 A CN 201410792312A CN 104459496 A CN104459496 A CN 104459496A
- Authority
- CN
- China
- Prior art keywords
- wireless
- control system
- circuit
- module
- long cable
- 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.)
- Pending
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention relates to a 220kV long cable voltage withstand test wireless control system and a control method of the wireless control system. The system comprises a control terminal and is characterized by further comprising a main control computer, the main control computer comprises an ARM, the ARM is connected with a wireless module used for communicating with the control terminal, a touch screen displayer, a CPLD and an A/D conversion circuit, the output end of the CPLD is connected with an SPWM driving module, the output end of the SPWM driving module is connected with an exciting transformer through a variable frequency voltage regulating output module, the exciting transformer is connected with an LC resonance circuit, the output end of the LC resonance circuit is connected with the first input end of the A/D conversion circuit, and the other output end of the variable frequency voltage regulating output module is connected with the second input end of the A/D conversion circuit. The wireless control system is simple in structure, and remote control of a worker can be achieved by a hardware device by means of an existing wireless communication protocol.
Description
Technical field
The present invention relates to the long cable voltage test wireless control system of a kind of 220kV and control method thereof.
Background technology
Current cable voltage test is general adopts variable-frequency series-resonance alternating-current voltage resistance test device, primarily of variable frequency control power supply, excitation change, reactor and capacitive divider composition.Tested by the output of manual operation variable frequency control power supply during test, operating personnel directly contact with controlling test equipment, produce puncture the personal safety that superpotential likely jeopardizes operating personnel when test specimen flashover discharges.Therefore, in order to ensure personal safety, study based on existing Radio Transmission Technology, development experiments wireless control system, Human-machine Control is accomplished, and insulation blocking is very important.
Summary of the invention
The object of this invention is to provide a kind of 220kV long cable voltage test wireless control system, this hardware unit can rely on existing home control network communication protocol, realizes the Long-distance Control of staff.
The present invention adopts following scheme to realize: a kind of 220kV long cable voltage test wireless control system, comprise a control terminal, it is characterized in that: also comprise a main control computer, described main control computer comprises ARM, and described ARM is connected with wireless module, touch screen displays, CPLD and A/D change-over circuit for communicating with described control terminal, the output terminal of described CPLD is connected with SPWM driver module, the output terminal of described SPWM driver module is once connected with an exciting transformer through frequency conversion voltage adjusting output module, described exciting transformer is connected with LC resonant circuit, and the output of described LC resonant circuit is connected with the first input end of described A/D change-over circuit, another output terminal of described frequency conversion voltage adjusting output module is connected with the second input end of described A/D change-over circuit, the input end of described frequency conversion voltage adjusting output module is connected to 220V or 380V alternating current, also comprise the high voltage reactor temperature current harvester that N number of and described control terminal communicates, described high voltage reactor temperature current harvester comprises an installation box body, described installation box body have an entrance hole and wire hole, a circuit board is provided with in described mounting box, described circuit board is provided with sample circuit, described sample circuit comprises the power circuit of powering for this sampling, MCU and the wireless transmitter module be connected with this MCU, the one A/D interface of described MCU is connected with a current transformer, the 2nd A/D interface of described MCU is connected with temperature sensor, described entrance hole is provided with the wire for being connected on described high voltage reactor terminals, and the other end of described wire is connected with the binding post being arranged at described wire hole, described current transformer is sheathed on described wire, and described temperature sensor is for gathering the temperature of described wire.
In an embodiment of the present invention, also comprise the upper cover for being wrapped up by described installation box body and lower cover, cover under described and offer described entrance hole and wire hole, described upper cover and lower cover include and comprise screen layer and casing plastic layer from the inside to the outside; Described screen layer is made up of aluminium alloy layer and magnetic layer; The two side of described lower cover offers grid shape air vent.
In an embodiment of the present invention, four perisporium tops of described lower cover offer the screw hole for fixing described upper cover.
In an embodiment of the present invention, be provided with a battery standing groove in described installation box body, described battery standing groove side successively tile vertically is provided with the antenna transmission plate of described wireless transmitter module and described circuit board.
In an embodiment of the present invention, described temperature sensor adopts SMD platinum resistance.
In an embodiment of the present invention, described MCU is also connected with communication and malfunction indicator lamp.
In an embodiment of the present invention, described MCU is also connected with key circuit.
Another object of the present invention is to provide the control method of a kind of above-mentioned 220kV long cable voltage test wireless control system, the method comprising the steps of S01: the series resonance software of resistance to pressure-controlled is set at described control terminal, this software comprises boosting configuration management element, measures test operation control module, Test Information display management unit, historical test data administrative unit and communications interface unit; Described boosting configuration management element is used for user and sets boosting configuration; Described Test Information display management unit transfers appointed information for user to show; Described historical test data administrative unit is used for the storage of historical test data and calls; Described communications interface unit is that the steering order of formation is sent to described main control computer by wireless communication protocol;
Step S02: user transfers historical test data and consults, arranges boosting configuration information according to historical test data simultaneously;
Step S03: starting characteristics test operation controls, then described communications interface unit sends wireless instructions according to boosting configuration information and controls to main control computer.
In invention one embodiment, also comprise the method to set up of high voltage reactor temperature current harvester:
Step S91: the terminals plug of described wire one end being accessed described high voltage reactor;
Step S92 a: lithium battery is installed in described battery case;
Step S93: upper cover and lower cover are covered described installation box body, and is screwed;
Step S94: the upper surface device fixed being fixed on described high voltage reactor.
Hardware configuration of the present invention is simple, possesses following advantage:
1, can realize adopting mobile terminal (panel computer) host computer to carry out the system of Based Intelligent Control, isolate the contact between testing crew and operating means, prevented the flyback voltage that test product produces when withstand voltage puncturing, the injury that the person is caused and security incident.
2, operating host platform controller with outreach radio host computer can Control experiment object, adopt the radio transmitter of Omron as wireless transmission net, signal carried out on a few road or tens road collection signals and distributes conveying.Reach man-machine interface close friend, can under the environment of highfield and high-intensity magnetic field reliably working.
3, host computer boost phase can within the time interval of setting storage voltage and the proportionate relationship between electric current and reactor temperature rise, and tabulate lattice and curve map etc.Increase outside setting value and carry out the defencive functions such as alarm.
4, can to the current acquisition of the temperature of exciting transformer, reactor and each monomer and wireless transmission.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention embodiment main control computer schematic block circuit diagram.
Fig. 2 is apparatus of the present invention embodiment system architecture schematic diagram.
Fig. 3 is series resonant device with variable frequency test principle wiring schematic diagram.
Fig. 4 is embodiment of the present invention structural representation.
Fig. 5 is embodiment of the present invention lower cover schematic diagram.
Fig. 6 is the A-A cross-sectional schematic of Fig. 5.
Fig. 7 is embodiment of the present invention upper cover schematic diagram.
Fig. 8 is circuit structure principle schematic of the present invention.
Fig. 9 is control terminal software block schematic illustration of the present invention.
Figure 10 is user's setting procedure schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As depicted in figs. 1 and 2, the present embodiment provides a kind of 220kV long cable voltage test wireless control system, comprise a control terminal, it also comprises a main control computer, described main control computer comprises ARM, and described ARM is connected with wireless module, touch screen displays, CPLD and A/D change-over circuit for communicating with described control terminal; The output terminal of described CPLD is connected with SPWM driver module, the output terminal of described SPWM driver module is once connected with an exciting transformer through frequency conversion voltage adjusting output module, described exciting transformer is connected with LC resonant circuit, and the output of described LC resonant circuit is connected with the first input end of described A/D change-over circuit; Another output terminal of described frequency conversion voltage adjusting output module is connected with the second input end of described A/D change-over circuit; The input end of described frequency conversion voltage adjusting output module is connected to 220V or 380V alternating current.The present invention, by control terminal, utilizes existing home control network communication protocol, realizes the controlled in wireless of user to the long cable voltage test of 220kV, prevents the flyback voltage that test product produces when withstand voltage puncturing, the injury cause the person and security incident.
Refer to Fig. 3, Fig. 3 is the principle of work wiring schematic diagram of series resonant device with variable frequency high-tension testing apparatus.Alternating current 220V/50Hz or 380V/50Hz power supply, the voltage of 20 ~ 300Hz frequency-adjustable is exported through frequency converter, send into exciting transformer, boost to 0 ~ 33000V, can be go here and there and the reactor combined through resonance reactor L() and tested cable Cx, form the main detune circuit of high pressure, capacitive divider is pure capacitive, is used for measuring trial voltage.
First send into a lower voltage U e through exciting transformer T to main resonant circuit by frequency converter, regulate the output frequency of frequency converter, when frequency satisfies condition
time, namely circuit reaches resonant condition.Now can under less field voltage Ue, make test specimen Cx produces several decuple Ue voltage U CX.
During resonance, the voltage on test specimen and the pass of electric current are
Output voltage UCX and the ratio of field voltage Ue are the integrated quality factor of test loop
As can be seen from above-mentioned principle of work:
1.1 quality factors are higher, and required power supply capacity is less.
1.2 resonance reactor L and tested cable Cx are in resonant condition, and this circuit forms a good filtering circuit, therefore output voltage UCX is good sinusoidal waveform.
During 1.3 tested cable breakdown, lose condition of resonance, the electric current in high-tension circuit and low-tension supply loop reduces on the contrary, and trouble spot can not expand by the electric arc of Gu Jueyuanjichuanchu, easy access.
Preferably, refer to Fig. 4 to Fig. 8, in the present embodiment, in order to realize the robotization controlled, the present embodiment also comprises high voltage reactor temperature current harvester, this high voltage reactor temperature current harvester comprises an installation box body 1, described installation box body have an entrance hole 2 and wire hole 3, a circuit board 4 is provided with in described mounting box, described circuit board is provided with sample circuit, described sample circuit comprises the power circuit of powering for this sampling, MCU and the wireless transmitter module be connected with this MCU, the one A/D interface of described MCU is connected with a current transformer 5, the 2nd A/D interface of described MCU is connected with temperature sensor 6, described entrance hole is provided with the wire 7 for being connected on described high voltage reactor terminals, and the other end of described wire is connected with the binding post being arranged at described wire hole, described current transformer is sheathed on described wire, and described temperature sensor is for gathering the temperature of described wire.By the Real-time Collection of N number of high voltage reactor temperature current harvester to high voltage reactor temperature and current data, feed back to control terminal, steering order through threshold value comparison, is sent to main control computer by control terminal again, and then realizes the controlled in wireless of the long cable voltage test of 220kV.
In an embodiment of the present invention, described installation box body comprises and comprises screen layer 8 and casing plastic layer 9 from the inside to the outside; Described screen layer is made up of aluminium alloy layer 10 and magnetic layer 11.
Refer to Fig. 4 to Fig. 8, in an alternative embodiment of the invention, this collection head structure also comprises for by the upper cover 12 of described installation box body parcel and lower cover 13, described lower cover 13 offers described entrance hole 2 and wire hole 3, and described upper cover and lower cover include and comprise screen layer 9 and casing plastic layer 8 from the inside to the outside; Described screen layer 9 is made up of aluminium alloy layer 10 and magnetic layer 11; The two side of described lower cover offers grid shape air vent 14.By adopting the encapsulation of magnetic conductive metal barrier, effectively can reduce the interference of high voltage reactor, ensure that the accuracy of image data.
In an embodiment of the present invention, four perisporium tops of described lower cover offer the screw hole 15 for fixing described upper cover.
Please continue see Fig. 1, in an embodiment of the present invention, be provided with a battery standing groove 16 in described installation box body, described battery standing groove side successively tile vertically is provided with the antenna transmission plate 17 of described wireless transmitter module and described circuit board.Lithium battery 18 is provided with in described battery standing groove.
In an embodiment of the present invention, described MCU is also connected with communication and malfunction indicator lamp.In an embodiment of the present invention, described MCU is also connected with key circuit.The button of this pilot lamp and key circuit can the exposed housing at this device outer (meaning not shown in the figures).
In addition, refer to Fig. 9 and Figure 10, the invention provides the control method of a kind of above-mentioned 220kV long cable voltage test wireless control system, the method comprising the steps of S01: the series resonance software of resistance to pressure-controlled is set at described control terminal, this software comprises boosting configuration management element, measures test operation control module, Test Information display management unit, historical test data administrative unit and communications interface unit; Described boosting configuration management element is used for user and sets boosting configuration; Described Test Information display management unit transfers appointed information for user to show; Described historical test data administrative unit is used for the storage of historical test data and calls; Described communications interface unit is that the steering order of formation is sent to described main control computer by wireless communication protocol;
Step S02: user transfers historical test data and consults, arranges boosting configuration information according to historical test data simultaneously;
Step S03: starting characteristics test operation controls, then described communications interface unit sends wireless instructions according to boosting configuration information and controls to main control computer.
In an embodiment of the present invention, the method to set up of high voltage reactor temperature current harvester is also comprised:
Step S91: the terminals plug of described wire one end being accessed described high voltage reactor;
Step S92 a: lithium battery is installed in described battery case;
Step S93: upper cover and lower cover are covered described installation box body, and is screwed;
Step S94: the upper surface device fixed being fixed on described high voltage reactor.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (9)
1. a 220kV long cable voltage test wireless control system, comprise a control terminal, it is characterized in that: also comprise a main control computer, described main control computer comprises ARM, and described ARM is connected with wireless module, touch screen displays, CPLD and A/D change-over circuit for communicating with described control terminal, the output terminal of described CPLD is connected with SPWM driver module, the output terminal of described SPWM driver module is once connected with an exciting transformer through frequency conversion voltage adjusting output module, described exciting transformer is connected with LC resonant circuit, and the output of described LC resonant circuit is connected with the first input end of described A/D change-over circuit, another output terminal of described frequency conversion voltage adjusting output module is connected with the second input end of described A/D change-over circuit, the input end of described frequency conversion voltage adjusting output module is connected to 220V or 380V alternating current, also comprise the high voltage reactor temperature current harvester that N number of and described control terminal communicates, described high voltage reactor temperature current harvester comprises an installation box body, described installation box body have an entrance hole and wire hole, a circuit board is provided with in described mounting box, described circuit board is provided with sample circuit, described sample circuit comprises the power circuit of powering for this sampling, MCU and the wireless transmitter module be connected with this MCU, the one A/D interface of described MCU is connected with a current transformer, the 2nd A/D interface of described MCU is connected with temperature sensor, described entrance hole is provided with the wire for being connected on described high voltage reactor terminals, and the other end of described wire is connected with the binding post being arranged at described wire hole, described current transformer is sheathed on described wire, and described temperature sensor is for gathering the temperature of described wire.
2. 220kV according to claim 1 long cable voltage test wireless control system, it is characterized in that: also comprise the upper cover for being wrapped up by described installation box body and lower cover, cover under described and offer described entrance hole and wire hole, described upper cover and lower cover include and comprise screen layer and casing plastic layer from the inside to the outside; Described screen layer is made up of aluminium alloy layer and magnetic layer; The two side of described lower cover offers grid shape air vent.
3. 220kV according to claim 2 long cable voltage test wireless control system, is characterized in that: four perisporium tops of described lower cover offer the screw hole for fixing described upper cover.
4. high voltage reactor temperature current harvester according to claim 1, it is characterized in that: be provided with a battery standing groove in described installation box body, described battery standing groove side successively tile vertically is provided with the antenna transmission plate of described wireless transmitter module and described circuit board.
5. 220kV according to claim 1 long cable voltage test wireless control system, is characterized in that: described temperature sensor adopts SMD platinum resistance.
6. 220kV according to claim 1 long cable voltage test wireless control system, is characterized in that: described MCU is also connected with communication and malfunction indicator lamp.
7. 220kV according to claim 1 long cable voltage test wireless control system, is characterized in that: described MCU is also connected with key circuit.
8. a control method for 220kV as claimed in claim 3 long cable voltage test wireless control system, is characterized in that comprising:
Step S01: the series resonance software of resistance to pressure-controlled is set at described control terminal, this software comprises boosting configuration management element, measures test operation control module, Test Information display management unit, historical test data administrative unit and communications interface unit; Described boosting configuration management element is used for user and sets boosting configuration; Described Test Information display management unit transfers appointed information for user to show; Described historical test data administrative unit is used for the storage of historical test data and calls; Described communications interface unit is that the steering order of formation is sent to described main control computer by wireless communication protocol;
Step S02: user transfers historical test data and consults, arranges boosting configuration information according to historical test data simultaneously;
Step S03: starting characteristics test operation controls, then described communications interface unit sends wireless instructions according to boosting configuration information and controls to main control computer.
9. control method according to claim 8, is characterized in that: the method to set up also comprising high voltage reactor temperature current harvester:
Step S91: the terminals plug of described wire one end being accessed described high voltage reactor;
Step S92 a: lithium battery is installed in described battery case;
Step S93: upper cover and lower cover are covered described installation box body, and is screwed;
Step S94: the upper surface device fixed being fixed on described high voltage reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410792312.0A CN104459496A (en) | 2014-12-19 | 2014-12-19 | 220kV long cable voltage withstand test wireless control system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410792312.0A CN104459496A (en) | 2014-12-19 | 2014-12-19 | 220kV long cable voltage withstand test wireless control system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104459496A true CN104459496A (en) | 2015-03-25 |
Family
ID=52905858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410792312.0A Pending CN104459496A (en) | 2014-12-19 | 2014-12-19 | 220kV long cable voltage withstand test wireless control system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104459496A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849613A (en) * | 2015-05-08 | 2015-08-19 | 北京电力经济技术研究院 | Test and detection integrated mobile platform for cable in voltage levels of 500kV or above |
| CN109581165A (en) * | 2018-12-28 | 2019-04-05 | 黄江涛 | Novel cable ac voltage withstanding pilot system |
| CN110501596A (en) * | 2019-08-30 | 2019-11-26 | 国网山西省电力公司电力科学研究院 | A kind of wireless control system and method for instruction carriage |
| CN110824345A (en) * | 2019-11-14 | 2020-02-21 | 国网辽宁省电力有限公司电力科学研究院 | Portable 10kV isolating switch alternating current withstand voltage test device based on wireless control technology |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001153914A (en) * | 1999-11-29 | 2001-06-08 | Hitachi Cable Ltd | Reporting method for current loading condition to remote end of power cable |
| CN102243288A (en) * | 2011-04-27 | 2011-11-16 | 丁鑫龙 | Frequency modulated series resonance withstand voltage detection device based on equal pulse width pulse-width modulation (PWM) control |
| CN103713240A (en) * | 2012-10-08 | 2014-04-09 | 四川金信石信息技术有限公司 | High-precision wireless cable partial discharge detector |
| CN103809094A (en) * | 2014-02-24 | 2014-05-21 | 苏州科技学院 | Field withstand voltage test protection device for ultra-long cable |
| CN204374363U (en) * | 2014-12-19 | 2015-06-03 | 国家电网公司 | 220kV long cable voltage test control device of wireless |
-
2014
- 2014-12-19 CN CN201410792312.0A patent/CN104459496A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001153914A (en) * | 1999-11-29 | 2001-06-08 | Hitachi Cable Ltd | Reporting method for current loading condition to remote end of power cable |
| CN102243288A (en) * | 2011-04-27 | 2011-11-16 | 丁鑫龙 | Frequency modulated series resonance withstand voltage detection device based on equal pulse width pulse-width modulation (PWM) control |
| CN103713240A (en) * | 2012-10-08 | 2014-04-09 | 四川金信石信息技术有限公司 | High-precision wireless cable partial discharge detector |
| CN103809094A (en) * | 2014-02-24 | 2014-05-21 | 苏州科技学院 | Field withstand voltage test protection device for ultra-long cable |
| CN204374363U (en) * | 2014-12-19 | 2015-06-03 | 国家电网公司 | 220kV long cable voltage test control device of wireless |
Non-Patent Citations (2)
| Title |
|---|
| 关琳琳: "10kV干式铁心电抗器无线测温系统的设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 李锐，陈光: "无线变频谐振耐压试验技术的研发及应用", 《冶金自动化》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849613A (en) * | 2015-05-08 | 2015-08-19 | 北京电力经济技术研究院 | Test and detection integrated mobile platform for cable in voltage levels of 500kV or above |
| CN109581165A (en) * | 2018-12-28 | 2019-04-05 | 黄江涛 | Novel cable ac voltage withstanding pilot system |
| CN110501596A (en) * | 2019-08-30 | 2019-11-26 | 国网山西省电力公司电力科学研究院 | A kind of wireless control system and method for instruction carriage |
| CN110824345A (en) * | 2019-11-14 | 2020-02-21 | 国网辽宁省电力有限公司电力科学研究院 | Portable 10kV isolating switch alternating current withstand voltage test device based on wireless control technology |
| CN110824345B (en) * | 2019-11-14 | 2024-06-28 | 国网辽宁省电力有限公司电力科学研究院 | Portable 10kV isolating switch alternating-current withstand voltage test device based on wireless control technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104459496A (en) | 220kV long cable voltage withstand test wireless control system and control method thereof | |
| CN203025309U (en) | Direct current partial discharge test analysis device for analog converter transformer | |
| CN207380224U (en) | A kind of multichannel power frequency magnetic field intensity synchronized measurement system | |
| CN101592701A (en) | Direct-current voltage withstanding test method for multilevel zinc oxide lightning arresters | |
| CN203881834U (en) | AC-DC current wireless monitoring equipment | |
| CN103869165A (en) | Live line measuring method of high-voltage transmission line suspended ceramic insulator insulating resistor | |
| CN102590717B (en) | Withstand voltage testing method for geographic information system (GIS) | |
| CN103809094A (en) | Field withstand voltage test protection device for ultra-long cable | |
| CN107561341A (en) | Arrester resistance current on-line monitoring method based on wireless synchronization Sampling techniques | |
| CN110824346B (en) | Power distribution network circuit breaker series resonance voltage withstand device for electric automobile power supply | |
| CN204374363U (en) | 220kV long cable voltage test control device of wireless | |
| CN207623504U (en) | A kind of integral type instrument for Site Detection voltage transformer | |
| CN201449423U (en) | Test device for DC withstand voltage test of multi-stage zinc oxide arresters | |
| CN201364814Y (en) | Passive high-voltage wireless current transformer | |
| CN115547746A (en) | SF (sulfur hexafluoride) 6 Anti-interference device and method for density relay | |
| CN110907707A (en) | Device and method for testing influence of ground wire claw gap discharge on unmanned aerial vehicle | |
| CN214674323U (en) | Special intelligent electronic box for dormitory of colleges and universities | |
| CN205898851U (en) | Appearance is sent in direct current examination to 35kV overhead line | |
| CN212622935U (en) | Power distribution network circuit breaker series resonance voltage withstand device for power supply of electric automobile | |
| CN104330596A (en) | Mobile direct-current contamination test power supply system | |
| CN208737640U (en) | A kind of intelligent fire pre-alarm device based on Lora | |
| CN212622936U (en) | Portable 10kV isolating switch alternating current withstand voltage test device based on wireless control technology | |
| CN204142784U (en) | Movable DC contamination experiment power supply system | |
| CN203813434U (en) | A mixed type electric power filtering cabinet | |
| CN105259445B (en) | A kind of 35kV and following voltage class Zinc-Oxide Arrester Automatic Test Equipment and its operation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
|
| RJ01 | Rejection of invention patent application after publication |