CN201766417U - Integrated device for protecting, detecting and combining units - Google Patents
Integrated device for protecting, detecting and combining units Download PDFInfo
- Publication number
- CN201766417U CN201766417U CN2010205264253U CN201020526425U CN201766417U CN 201766417 U CN201766417 U CN 201766417U CN 2010205264253 U CN2010205264253 U CN 2010205264253U CN 201020526425 U CN201020526425 U CN 201020526425U CN 201766417 U CN201766417 U CN 201766417U
- Authority
- CN
- China
- Prior art keywords
- plug
- dsp
- protection
- chip
- unit
- 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.)
- Expired - Lifetime
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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
Abstract
Integrated device for protecting, detecting and combining units is used for spacer layers of digital substation, comprising a liquid crystal, a DSP plug-in component, a CPU plug-in component and an intelligent I/O plug-in component, wherein the DSP plug-in component comprises a DSP chip, a field programmable gates array (FPGA) chip, a PCI Ethernet controller and an optical fibre transceiver; the CPU plug-in component, the DSP plug-in component and the intelligent I/O plug-in component are in data connection by a CAN bus; the receiving end of the CPU plug-in component is connected to a corresponding man-machine interface plug-in component; voltage and current sampling values can be output from an Ethernet interface, and transmitted into the DSP chip via a point-to-point optical fibre; the DSP chip processes the combined output and connects the output to the FPGA; A FPGA output result is connected to the PCI Ethernet controller and the optical fibre transceiver; the integrated device of the utility model can be used for protecting and monitoring digital relays based on an electronic mutual inductor and IEC61850 standards and arranged according to the spacer layer in a digital substation.
Description
Technical field
The utility model relates to the incorporate device of a kind of protection, observing and controlling and merge cells, is used for digital relay protection, the observing and controlling based on electronic mutual inductor and IEC61850 standard (comprise GOOSE mechanism) of digital transformer substation by arranged spaced.
Background technology
Microcomputer protective relay device exchanges aanalogvoltage, the magnitude of current and dc switch amount by the acquisition module collection in the conventional transformer station.Amplifier, frequency overlapped-resistable filter and an A/D converter all are equipped with in each road ac analog input, and analog quantity is converted to digital quantity.The protection of device, control action outlet rely on the hard contact of relay.
Because the electronic mutual inductor of digital transformer substation and the use of GOOSE, the protective relaying device in the conventional transformer station can not meet the demands.As of the comparison of the conventional station of Fig. 1 with digitizing station.
Summary of the invention
The purpose of this utility model is: for solving the requirement of digital transformer substation, based on digital relay protection, the measurement and control integration device of electronic mutual inductor and IEC61850 standard (comprising GOOSE mechanism).Support the IEC61850 standard fully, towards arranged spaced.Voltage, electric current (protection and measurement) are taken from electronic mutual inductor, and the digital signal of sampled value are exported by IEC 61850-9-2 agreement Ethernet interface.Switch intelligent terminal function, sampling merge cells function, with protection, observing and controlling functional unification, all realize by a table apparatus.Device can be transferred on the switch cubicle and be arranged.
Technical solutions of the utility model are: the incorporate device of protection, observing and controlling and merge cells, be applied to the digital transformer substation wall, comprise the DSP plug-in unit, CPU card and intelligent I/O plug-in unit, wherein the DSP plug-in unit comprise dsp chip,
Field programmable gate array chip FPGA, PCI ether net control device and fiber optical transceiver, CPU card comprise microprocessor CPU chip, PCI ether net control device and high accuracy PHY chip; Intelligence I/O plug-in unit comprises switching value input, output, DC power supply and breaker operator loop, and the DSP plug-in unit inserts the electric mutual inductor remote end module by backboard; Carrying out data by the CAN bus between CPU card, DSP plug-in unit, the intelligent I/O plug-in unit connects; The CPU card receiving terminal connects corresponding man-machine interface plug-in unit, and output is connected to the man-machine interface plug-in unit simultaneously; It is characterized in that the voltage and current of ac of the protection of process layer of digitalization transformer substation and measurement takes from the electronic mutual inductor of process layer of digitalization transformer substation, the digital signal of voltage and current amount sampled value merges the back and exports from Ethernet interface by IEC 61850-9-2 agreement; And point-to-point optical fiber imports dsp chip into, the output that dsp chip is handled after merging is connected to field programmable gate array chip FPGA, FPGA output result is connected to PCI ether net control device and fiber optical transceiver, exports to the process layer network with IEC 61850-9-2 agreement Ethernet interface; Host computer is connected to the high accuracy PHY chip and the PCI ethernet controller of CPU card by the station level network, and the PCI ethernet controller connects the message of resolving gives cpu chip, and cpu chip is connected to liquid crystal by 485 communication ports simultaneously.
The utility model is all realized by a table apparatus.Device can be transferred on the switch cubicle and be arranged.The utility model can be used for digital relay protection, the observing and controlling based on electronic mutual inductor and IEC61850 standard (comprise GOOSE mechanism) of digital transformer substation by arranged spaced.
Described PCI ethernet controller connects the message of resolving gives cpu chip, realizes fault recording system, protection analytical system, monitoring and automated system based on the IEC61850 standard.The microprocessor CPU chip of CPU card connects DSP plug-in unit and intelligent I/O plug-in unit by the CAN bus, realizes relaying protection and observing and controlling function; This chip is connected to liquid crystal by 485 communication ports simultaneously.IEC60044-8 standard agreement (FT3 form) is followed in optical-fibre communications, and FPGA carries out stipulations conversion and coding,
Switch intelligent terminal function, sampling merge cells function, with protection, observing and controlling functional unification, realize the function of merge cells.The microprocessor CPU chip of CPU card connects DSP plug-in unit and intelligent I/O plug-in unit by the CAN bus.
Device disposes protection components such as overcurrent protection, zero sequence overcurrent protection, reclosing, voltage protection, non electrical quantity protection, can realize the protection to primary equipments such as feeder line, capacitor, transformers.Device dispose 14 tunnel self-defined remote signalling open into, can provide the remote measurement of 5 groups of remote control branches/close and Iam, Ibm, Icm, IO, UA, UB, UC, UAB, UBC, UCA, U0, F, P, Q, COS ф etc. at the most.
Of ac is to be introduced by the electronic mutual inductor phase-splitting by the multimode fiber passage, and IEC60044-8 standard agreement (FT3 form) is followed in optical-fibre communications.Point-to-point optical fiber imports following analog quantity into: three-phase protective electric current (Ia, Ib, Ic), three-phase are measured electric current (Iam, Ibm, Icm), bus three-phase voltage (Ua, Ub, Uc).Device merges the back with sampled value and exports process layer SMV network to by IEC61850-9-2 agreement Ethernet interface, shares for other protections or smart machine.
Sampling rate: 4K～5KHz;
Optical fiber interface index: transmission wavelength 850nm (multimode); Transmission medium 62.5/125 or 50/125 μ m multimode fiber; The fiber-optic signal receiving sensitivity is-29dbm; Optical fiber connector ST type.
Device is by Ethernet interface, and by the GOOSE mechanism of IEC61850 standard, the receiving key amount also sends the breaker tripping and closing order, does not need cable to connect the transmission that gets final product switching value between implement device.Carry the operation circuit plug-in unit, realize switch intelligent terminal function.
Device disposes protection components such as overcurrent protection, zero sequence overcurrent protection, reclosing, voltage protection, non electrical quantity protection, can realize the protection to primary equipments such as feeder line, capacitor, transformers.
Device dispose 14 tunnel self-defined remote signalling open into, can provide the remote measurement of 5 groups of remote control branches/close and Iam, Ibm, Icm, I0, UA, UB, UC, UAB, UBC, UCA, U0, F, P, Q, COS ф etc. at the most.
Device is furnished with ethernet communication (100Mbps, CAT5E UTP cable or optical-fibre communications) but interface access station control layer network is supported with the IEC-61850 communication protocol, and the distant place that implement device is described is checked, the distant place of system's definite value checks, protects that the distant place of definite value and area code is checked, modify feature.The distant place of soft pressing plate state checks, throw move back, distant control function, unit protection open that a distant place of checking, installing running status (comprising state, operation alarm and the self-check of device information of protecting action element) into the distant place of state is checked, a distant place is to the device signal return.Send function on the failure wave-recording.Can be used with fault recording system, protection analytical system, monitoring and automated system.
The beneficial effects of the utility model:
1, improved protection, measure the precision of sampled value, the linearity and realized that the full station of data shares.Owing to directly obtain digital quantity from electronic mutual inductor, reduced the saturated influence of instrument transformer to protection, avoided the influence of electromagnetic interference to the analog quantity sampling.This can be confirmed from two aspects of hardware and software.Electronic mutual inductor is sent to device by optical fiber with 4K～5KHz.Device adopt the Lagrange's interpolation algorithm realize between each sampling channel synchronously, merge the full station of sending the SMV network to realize data on the back and share.
2, device is at the characteristics of electronic mutual inductor sampling, and perfect protection and the various algorithms of measuring take into full account under the situation of diverse network fault or communicating interrupt, reach higher accuracy and reliability.
3, have powerful GOOSE function, do not need contact and the cooperation of cable between can implement device, the convenient defencive functions such as simple and easy bus differential protection, overload connection are cut, automatic closing of realizing.
4, have powerful network function and communication capacity.Are furnished with 2 independently Ethernet interfaces from hardware.Support power industry communication standard DL/T667-1999 (IEC60870-5-103) and the communication standard IEC61850 of transformer station of new generation, can be used, realize full station observing and controlling with fault recording system, protection analytical system, monitoring and automated system.
5, have on full station synchronized sampling and the SOE and send ability.Install for this reason to the time interface can support multiple GPS to the time mode, comprise contact to the time, 485 pairs the time, support the IRGB sign indicating number to the time.
6, device adopts the ripe platform of PCS series protection.32 high performance CPU and DSP, inner high speed bus, intelligent I/O, hardware and software all adopts modularized design, and is configurable flexibly, have general, be easy to the characteristics expanding, be easy to safeguard
Description of drawings
Fig. 1 is the comparison diagram of conventional station of Fig. 1 and digitizing station
Fig. 2 is the system block diagram of the utility model protection, measurement and control integration device
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
Integrated apparatus of the present utility model: comprise power insert, CPU card, DSP plug-in unit, intelligent I/O plug-in unit and man-machine interface plug-in unit.The DSP plug-in unit inserts the electric mutual inductor remote end module by backboard; CPU card, the DSP plug-in unit carries out data by the CAN bus between the intelligent I/O plug-in unit and connects; CPU card receives the information of corresponding man-machine interface plug-in unit input, simultaneously final output result is connected to man-machine interface plug-in unit and backstage protection engineer station's (host computer).Of ac is inserted by described electronic mutual inductor phase-splitting by the multimode fiber passage, and insert dsp chip by point-to-point optical fiber, the output that dsp chip is handled after merging is connected to field programmable gate array chip FPGA, FPGA will export the result and be connected to PCI ether net control device and fiber optical transceiver, and export to the process layer network with IEC 61850-9-2 agreement Ethernet interface.
The B01:CPU plug-in unit provides maximum four road Ethernet interfaces (two-way fiber optic Ethernet, two-way twisted-pair Ethernet), serial print mouth.
B02, the DSP plug-in unit is in order to realize transmission-receiving function, FT3 Data Receiving, the 9-2 data sending function of GOOSE.The uppermost two pairs of optical fiber of plug-in unit are in order to realize transmission-receiving function and the 9-2 data sending function of GOOSE.Protective current, measurement electric current and the line voltage distribution (FT3 form) of three middle optical fiber in order to introduce the ABC three-phase respectively.Optical fiber bottom in order to introduce the IRIG-B sign indicating number to the time signal.
B06, intelligent I/O plug-in unit is the outlet plug-in unit.
B07, intelligent I/O plug-in unit is for opening into plug-in unit, and terminal 701～721 is opened into input for remote signalling, and terminal 722 is public negative terminal.
As shown in the figure, device is introduced line voltage distribution, the protective current of each phase respectively and is measured electric current (this tittle also is sent by the IEC61850-9-2 stipulations) by 3 optical fiber by the FT3 form of IEC60044-8 stipulations by B02 plug-in unit (NR4126).
CPU handles the digital signal that obtains, and constitutes various protection relays.
Ia, Ib, Ic do overcurrent protection and use.Iam, Ibm, Icm do to measure and use.
Ua, Ub, Uc are busbar voltage, and as protection with measure sharedly, it calculates P, Q, COS ф, kWh, the kVarh that forms this circuit with Iam, Ibm, Icm in this device.
Install self-produced 3U0, be used for residual voltage warning differentiation and residual voltage and measure.
The field programmable gate array chip of DSP plug-in unit adopts EP2C5F25618N, and fiber optical transceiver adopts HFBR2412 and AFBR5803, and dsp chip adopts ADSP_BF537.
The CPU card of CPU card adopts the SPC5200 processor, and the PCI ethernet controller adopts 88E6060.
Claims (2)
1. the incorporate device of protection, observing and controlling and merge cells, be applied to the digital transformer substation wall, comprise liquid crystal, DSP plug-in unit, CPU card and intelligent I/O plug-in unit, wherein the DSP plug-in unit comprises dsp chip, field programmable gate array chip FPGA, PCI ether net control device and fiber optical transceiver, and CPU card comprises microprocessor CPU chip, PCI ether net control device and high accuracy PHY chip; Intelligence I/O plug-in unit comprises switching value input, output, DC power supply and breaker operator loop, and the DSP plug-in unit inserts the electric mutual inductor remote end module by backboard; Carrying out data by the CAN bus between CPU card, DSP plug-in unit, the intelligent I/O plug-in unit connects; The CPU card receiving terminal connects corresponding man-machine interface plug-in unit, and output is connected to the man-machine interface plug-in unit simultaneously; It is characterized in that the voltage and current of ac of the protection of process layer of digitalization transformer substation and measurement takes from the electronic mutual inductor of process layer of digitalization transformer substation, the digital signal of voltage and current amount sampled value merges the back and exports from Ethernet interface by IEC 61850-9-2 agreement; And point-to-point optical fiber imports dsp chip into, the output that dsp chip is handled after merging is connected to field programmable gate array chip FPGA, FPGA output result is connected to PCI ether net control device and fiber optical transceiver, exports to the process layer network with IEC 61850-9-2 agreement Ethernet interface; Host computer is connected to the high accuracy PHY chip and the PCI ethernet controller of CPU card by the station level network, and the PCI ethernet controller connects the message of resolving gives cpu chip, and cpu chip is connected to liquid crystal by 485 communication ports simultaneously.
2. protection as claimed in claim 1, observing and controlling and the incorporate device of merge cells; it is characterized in that: other is provided with overcurrent protection, zero sequence overcurrent protection, reclosing, voltage protection and non electrical quantity protection protection component, realizes the protection to feeder line, capacitor and transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205264253U CN201766417U (en) | 2010-09-13 | 2010-09-13 | Integrated device for protecting, detecting and combining units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205264253U CN201766417U (en) | 2010-09-13 | 2010-09-13 | Integrated device for protecting, detecting and combining units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201766417U true CN201766417U (en) | 2011-03-16 |
Family
ID=43719025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205264253U Expired - Lifetime CN201766417U (en) | 2010-09-13 | 2010-09-13 | Integrated device for protecting, detecting and combining units |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201766417U (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157982A (en) * | 2011-03-31 | 2011-08-17 | 国电南瑞科技股份有限公司 | Intelligent terminal for power transformer |
| CN102832709A (en) * | 2012-08-07 | 2012-12-19 | 邯郸供电公司 | Comprehensive protection management machine of intelligent substation spacer layer |
| CN103023149A (en) * | 2012-12-12 | 2013-04-03 | 天津市电力公司 | Intelligent power distribution terminal and intelligent power distribution system based on IEC61850 |
| WO2013123767A1 (en) * | 2012-02-24 | 2013-08-29 | 安徽省电力公司芜湖供电公司 | Transformer substation dual-protocol monitoring system and method thereof |
| CN103607053A (en) * | 2013-12-01 | 2014-02-26 | 国网河南省电力公司安阳供电公司 | Intelligent switching room system of three-layer structure |
| CN104333134A (en) * | 2014-10-30 | 2015-02-04 | 国家电网公司 | Substation cluster measurement and control system ICD model automatic recognition device and recognition method |
| CN104485740A (en) * | 2014-12-10 | 2015-04-01 | 国家电网公司 | Visible intelligent station defect elimination method based on secondary circuit |
| CN105977923A (en) * | 2016-05-09 | 2016-09-28 | 国网山东省电力公司 | Relay protection device and system, realizing plug-and-play, of transformer station |
| CN106685090A (en) * | 2014-09-04 | 2017-05-17 | 国电南瑞科技股份有限公司 | Plug-in online detection method for micro-grid regional protection and control integrated device |
| CN107134850A (en) * | 2017-04-26 | 2017-09-05 | 中国人民解放军海军工程大学 | A kind of Ship Electrical Power System failure wave-recording main frame |
| CN108508325A (en) * | 2017-02-26 | 2018-09-07 | 武汉市欧睿科技有限公司 | Hardware structure of the optical fiber current mutual inductor in distribution network automated |
| CN108767806A (en) * | 2018-05-28 | 2018-11-06 | 国网辽宁省电力有限公司电力科学研究院 | The integrated hardware platform and processing method of integrated relay protection, observing and controlling and recording function |
| CN114371641A (en) * | 2021-12-02 | 2022-04-19 | 浙江省送变电工程有限公司 | Portable quick switch debugging device |
| CN114371641B (en) * | 2021-12-02 | 2024-04-26 | 浙江省送变电工程有限公司 | Portable quick switch debugging device |
-
2010
- 2010-09-13 CN CN2010205264253U patent/CN201766417U/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157982A (en) * | 2011-03-31 | 2011-08-17 | 国电南瑞科技股份有限公司 | Intelligent terminal for power transformer |
| WO2013123767A1 (en) * | 2012-02-24 | 2013-08-29 | 安徽省电力公司芜湖供电公司 | Transformer substation dual-protocol monitoring system and method thereof |
| CN102832709A (en) * | 2012-08-07 | 2012-12-19 | 邯郸供电公司 | Comprehensive protection management machine of intelligent substation spacer layer |
| CN103023149A (en) * | 2012-12-12 | 2013-04-03 | 天津市电力公司 | Intelligent power distribution terminal and intelligent power distribution system based on IEC61850 |
| WO2014090018A1 (en) * | 2012-12-12 | 2014-06-19 | 天津市电力公司 | Iec61850 standard-based intelligent power distribution terminal |
| CN103607053A (en) * | 2013-12-01 | 2014-02-26 | 国网河南省电力公司安阳供电公司 | Intelligent switching room system of three-layer structure |
| CN106685090B (en) * | 2014-09-04 | 2019-06-25 | 国电南瑞科技股份有限公司 | A kind of plug-in unit online test method of micro-capacitance sensor locality protection control integrated apparatus |
| CN106685090A (en) * | 2014-09-04 | 2017-05-17 | 国电南瑞科技股份有限公司 | Plug-in online detection method for micro-grid regional protection and control integrated device |
| CN104333134A (en) * | 2014-10-30 | 2015-02-04 | 国家电网公司 | Substation cluster measurement and control system ICD model automatic recognition device and recognition method |
| CN104485740A (en) * | 2014-12-10 | 2015-04-01 | 国家电网公司 | Visible intelligent station defect elimination method based on secondary circuit |
| CN105977923A (en) * | 2016-05-09 | 2016-09-28 | 国网山东省电力公司 | Relay protection device and system, realizing plug-and-play, of transformer station |
| CN108508325A (en) * | 2017-02-26 | 2018-09-07 | 武汉市欧睿科技有限公司 | Hardware structure of the optical fiber current mutual inductor in distribution network automated |
| CN107134850A (en) * | 2017-04-26 | 2017-09-05 | 中国人民解放军海军工程大学 | A kind of Ship Electrical Power System failure wave-recording main frame |
| CN107134850B (en) * | 2017-04-26 | 2024-02-13 | 中国人民解放军海军工程大学 | Ship electric power system fault wave recording host |
| CN108767806A (en) * | 2018-05-28 | 2018-11-06 | 国网辽宁省电力有限公司电力科学研究院 | The integrated hardware platform and processing method of integrated relay protection, observing and controlling and recording function |
| CN114371641A (en) * | 2021-12-02 | 2022-04-19 | 浙江省送变电工程有限公司 | Portable quick switch debugging device |
| CN114371641B (en) * | 2021-12-02 | 2024-04-26 | 浙江省送变电工程有限公司 | Portable quick switch debugging device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201766417U (en) | Integrated device for protecting, detecting and combining units | |
| CN205105000U (en) | Digital relay protection observes and controls and intelligent terminal integrated device | |
| CN101841446B (en) | Pilot channel transmission device, optical fiber differential protective device and method | |
| CN102937685B (en) | The integrated testing platform of a kind of transformer station based on Real-time Simulation Technology | |
| CN202737576U (en) | Intelligent measure-control apparatus used for low voltage power distribution network | |
| CN101895152B (en) | Intelligent interface device of digital transformer substation switch | |
| CN105006892B (en) | A kind of power distribution network intelligent FTU based on embedded-type ARM and multi-communication protocol | |
| CN2938120Y (en) | Integral power measuring control device | |
| CN203133246U (en) | On-line switch monitoring device | |
| CN103545926A (en) | Distributed power supply grid connection interface device | |
| CN104333138A (en) | High-voltage protection, measurement and control multifunctional integrated device | |
| CN104701979A (en) | Protective measurement and control integrated device and protective measurement and control method | |
| CN108599095B (en) | Safety device integrating bus-tie spare power automatic switching and main transformer spare power automatic switching functions | |
| CN103001319B (en) | Integrated intelligent component | |
| CN101950954A (en) | Low-voltage microcomputer protection device | |
| CN201750231U (en) | Digital transformer station multifunctional protection device | |
| CN105932776A (en) | Substation secondary system based on master units and subunits | |
| CN102263820A (en) | Intelligent transformer substation network communication structure based on protection independence and information sharing | |
| CN103259334A (en) | Three-state integrated measuring and controlling device for transformer substation | |
| CN201750230U (en) | Intelligentized substation multi-function intelligent terminal | |
| CN201682274U (en) | Intelligent explosion-proof switch integrated protector | |
| CN102946092A (en) | Line transformer protection device with tripping and closing current measuring function | |
| CN203151221U (en) | Low-voltage combination intelligent unit device | |
| CN210273598U (en) | GIS switch combination electric body terminal, integrative integrated terminal of change on spot | |
| CN203537070U (en) | Distributed power supply grid connection interface device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110316 |