CN2624494Y - Power distribution automation feeder line monitor terminal - Google Patents
Power distribution automation feeder line monitor terminal Download PDFInfo
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- CN2624494Y CN2624494Y CN 02292937 CN02292937U CN2624494Y CN 2624494 Y CN2624494 Y CN 2624494Y CN 02292937 CN02292937 CN 02292937 CN 02292937 U CN02292937 U CN 02292937U CN 2624494 Y CN2624494 Y CN 2624494Y
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Abstract
A power distribution feeder automatic monitoring terminal is provided, which is characterized in that: The utility model consists of a power supply unit, a protection unit, a measurement control unit, a data communication unit with the fault information communication and an operating unit; the protection unit fulfills the fault sampling information analysis with a digital analysis circuit DSP, and comprises a Fourier FFT analysis, and a high frequency filter and integral calculation, and exchange the fault information with the adjacent terminal according to the analysis results; the measurement control unit determines and issues the operating commands to the operating unit with CPU and combined with the fault information of adjacent equipment; the operating unit starts the power distribution network breaker for removing the faults of power distribution network, fulfills the safety isolating of fault points and system restore according to the incoming direction and troubleshooting information. The rapid and minimum range of faults eliminating can be realized to meet with the rapid, high reliability, sensitive and selective requirements.
Description
Technical field:
The utility model relates to the power distribution automation feed terminal unit of power industry, particularly about a kind of channel formula protection type feed terminal unit of power distribution automation.
Background technology:
At present, the line feed terminals of three kinds of electrical power distribution automatization systems is arranged, distinguish by its principle, be respectively current mode, voltage-type and telemechanical type.Low reliability, low-security, non-selectivity, reaction speed be slow, can not to constitute ladder reserve and can not make up under complex network be the major defect of line feed terminals always, perplexing domestic power distribution automation practicability popularization.
The electrical power distribution automatization system monitor terminal of current mode, its failure removal cooperates tripping operation by size of current, the operation principle of its Fault Isolation is after main website receives the fault current that comes from the terminal detection, by judging that its afterbody flows through the switch of fault current and the switch of first order fault-free electric current, determine that fault occurs between this two-stage switch, send out the separating brake order to this two-stage switch then and realize Fault Isolation.Advantage is that the fault excision is fast, selectivity is good.There is substation breakers to do reserve.Shortcoming is that sensitivity is low, has the differential matching problem of electric current, when the short distance circuit breaker disposes, can't adjust.Poor reliability, transient fault will be regarded as permanent fault and be isolated, thereby can cause the problem of expansion accident.During system reconfiguration, differential position change causes malfunction.Must rely on remote control and revise definite value reconstruct.Must do many cover setting programs for different operational modes, select complex managementization for use during for reconstruct.Rely on communication.Because revise the needs of definite value, reconstruct must be finished by communication.
The voltage time type is joined the motorized line feed terminals, is meant the equipment based on voltage, time cooperating principle.Its operate as normal and to the judgement of accident, to handle all be to be basic criterion with voltage, send electricity piecemeal by the time-delay of the first section input, comes the failure judgement interval.Advantage is simple, stable, small investment, instant effect.Shortcoming is that sensitivity is low.When through overcurrent resistive short or distance, tripping.Non-selectivity.First circuit breaker trip, the tripping operation of threading off completely.Recovery time is long, and full the jumping must prolong recovery time, and when recovering, every grade of equipment time-delay, progression is many more slow more.The backup protection of a no distant place.
Telemechanical type power distribution automation line feed terminals.At present, domestic each power distribution automation manufacturer production belong to this kind of more, transforming plant protecting is finished excision work, is recovered by DTU receipt fault data then.Advantage is complete data collection arbitration functions, the automaticity height.Resume speed is fast, and remote control is carried out after the computer intelligence analysis.Shortcoming is a poor selectivity, and the excision fault does not have selection.The excision failure classes are finished by transformer station like voltage-type.Communication relies on.By central station failure data acquisition is finished judgement, finish the reconstruct of system, the communicating requirement height, all work are finished by communication, and throwing is inferior big, poor reliability, the backup protection of a no distant place, sensitivity is low.Fault is excised by transforming plant protecting, and therefore, the protection definite value can only can not be adjusted to segmentation by the position of electric substation to the configuration of adjusting completely, and definite value is bigger, and sensitivity is low, does not have reflection for glitch, just moves after must the pending fault development serious.
In addition, above-mentioned three kinds of line feed terminals have a fatal weakness, promptly all use transformer substation switch as excision equipment, when this equipment tripping occurs and does, excise total transformer by transformer station's master switch, cause regional large-area power-cuts.
Summary of the invention:
Technical problem to be solved in the utility model is to avoid existing weak point in the above-mentioned prior art; a kind of protection type power distribution automation feed terminal unit is provided; by local accident analysis and channel data exchange; quick, the minimum zone of realizing fault excise on the spot, to reach quick, reliable, sensitive and optionally requirement.
The technical scheme that the utility model technical solution problem is adopted is:
Design feature of the present utility model is made up of the data communication unit and the operating unit of power subsystem, protected location, measurement and control unit, the communication of tape jam action message; Described protected location comprises Fourier fft analysis, High frequency filter and integral and calculating, and finishes and adjacent end exchange trouble action message with its analysis result with the analysis that numerical analysis circuit DSP finishes the fault sample information; Described measurement and control unit judges and assigns operational order and give operating unit with the fault message of CPU in conjunction with the next neighbouring device of communication unit exchange; The safety isolation and the system restoration that start failure removal that the power distribution network circuit breaker carries out distribution network, finish distribution fault point according to the direction and the failure removal information of incoming call with operating unit.
Wherein, the numerical analysis circuit comprises data acquisition, master data analysis and I/O expanded circuit, and its data acquisition is sent into dsp system by 8 road A/D converters; Measurement and control unit logic analysis circuit is made up of I/O expanded circuit, cpu circuit and light surround electric isolating circuit; Operating unit is formed the actuating signal output system by relay and photoelectric isolating circuit.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
1, fault coverage is selected accurately.Many merits can not occur, repeat problems such as excision.Solved the defect of failure removal expanded range and repetition test from function, system restoration is very simple, owing to there is not unnecessary excision, does not need recovery operation generally speaking.When there was standby switch in system, only recovery was just finished in once-through operation.This device inside is provided with a cover major error and detects protection system, a cover reserve fault detect and a cover after accelerated protection.Differentiate fault on the spot and add accurately excision fault point of distant place action cooperation.
2, failure removal is swift in motion.The speed of the failure removal of system is brought up to the Millisecond of this device by level second of original common automation line feed terminals.In less than 10～20ms, finish the action message exchange of fault, in less than 30～40ms, finish the differentiation and action output of fault.
3, safe and reliable, complete malfunctioning guarantee arranged.Because system has adopted an active/standby mode and a distant place to prevent malfunctioning function, also can reach perfectly safe even a table apparatus and communication thereof damage fully, the automation line feed terminals that this point is other type is not available.
4, fault detect sensitivity.Its sensitivity has reached 2.0 grades, is not subjected to the influence of nature of trouble and type.Far above voltage, electric current and telemechanical type.
5, can apply to complex network.At the circuit that branch is arranged and having under the network condition of ring-type, the automation line feed terminals of other type can not be worked, and this device can accurately be judged by the direction or the action message of communications exchange fault current.
6, complete fault recovery system.For the distribution line that standby network interconnecting circuit is arranged, can write down intactly recovery system regular link user's operation according to the direction and the fault actions of sending a telegram here automatically.
The utility model can be widely used in the power distribution automation field.
Fig. 1 is the utility model structured flowchart.
Fig. 2 is the utility model architectural feature figure.
Fig. 3 is the utility model data analysis circuit schematic diagram.
Fig. 4 is the utility model measurement and control unit supervisory control system schematic diagram.
Fig. 5 is the utility model measurement and control unit DI input schematic diagram.
Fig. 6 is the utility model measurement and control unit AI input schematic diagram.
Fig. 7 is the utility model operating unit circuit theory diagrams.
Fig. 8 is the utility model latch-up protection logic diagram.
Fig. 9 is the utility model permission formula protection logic diagram.
Figure 10 divides control communication structure block diagram for the utility model.
Embodiment:
Referring to Fig. 1, Fig. 2, present embodiment is made up of data communication (control communication) unit and the operating unit of power subsystem, protected location, measurement and control unit, tape jam action message communication (protection information communication).
Protected location comprises Fourier fft analysis, High frequency filter and integral and calculating, and finishes and adjacent end exchange trouble action message with its analysis result with the analysis that numerical analysis circuit DSP finishes the fault sample information; Measurement and control unit judges and assigns operational order and give operating unit with the fault message of CPU in conjunction with the next neighbouring device of communication unit exchange; The safety isolation and the system restoration that start failure removal that the power distribution network circuit breaker carries out distribution network, finish distribution fault point according to the direction and the failure removal information of incoming call with operating unit.
Referring to Fig. 3, in the present embodiment, the numerical analysis circuit comprises: data acquisition, master data analysis and I/O expanded circuit, its data acquisition are sent into the TMS320C52 of dsp system by 8 road A/D converters.The master data analysis is born by DSP, the filtering of the line data of going forward side by side, fft analysis, numerical integration, protection running value relatively, and the data acquisition of system when normally moving.
Referring to Fig. 4, Fig. 5 and Fig. 6, measurement and control unit logic analysis circuit is formed the I/O expanded circuit by 8255 and is made up of cpu circuit and part light surround electric isolating circuit, the action logic of finishing fault cooperates and cooperation operate time, whether determination device moves, and sends the fault actions requirement of this device to adjacent automation line feed terminals of the same type by communicating circuit; Finish the reconstruct of excision task, coincidence task and the electrical network of fault and make task.When system normally moves, finish the collection of data volume and report work.
Referring to Fig. 7, operating unit is formed the actuating signal output system by OMRON relay and photoelectric isolating circuit, and the one, finish the primary cut-out operation according to the situation and the action record of instruction of logic analysis circuit and equipment; The 2nd, finish the primary cut-out operation according to the manual remote control order of higher level main website.
The serial communication circuit that communication unit is sent by CPU, the state communicating circuit of being isolated by INTEL 8255 and photoelectricity are formed, communication divides two classes from the data angle, one class is setting and the measurement communication of serial communication in system, and the state communicating circuit is finished the information exchange with adjacent automation line feed terminals.
In addition, in the present embodiment, adopt dual-cpu structure (TMS320C52+8051), come the control system operation except using general purpose microprocessor 8051, also increased a digital processing chip TMS320C52, finish the processing of analog input amount and calculate, finish every function efficiently thereby system can be walked abreast.
General purpose microprocessor is 8051, mainly finishes the software download of hardware initialization, DSP and all concurrent communication and digital I/O mouths and handles.8051 microprocessors are MCU of 8bit, and 8051 operating frequencies in the native system are 24MHz, have 8 external data buss, 64K programmable internal memory, 64K datarams.Its part comprises: serial communication port able to programme, 16 PCA of 5 passages, 128 byte ram in slice, 32 road programmable Is/O passage, 8 high-speed AD of 8 passages, interrupt control unit, 2 16 standard timing/counters.
DSP adopts 16 fixed point single-chip digital signal processor TMS320LC52 of high integration, 40MHz basic frequency, 40MIPS, the program area and the 64K data field that comprise 64K, a built-in DMA interface, a standard serial interface and 1 buffering serial line interface, DMA interface be used for and host CPU between transfer of data, serial port is used for reading sampled data from the serial a/d transducer.A small amount of logical circuit among the FPGA and a pair of octal system latch are finished its external interface.The program code execution of DSP is stored in the FLASH memory of main circuit, when system's power-up initializing, is written into by the DMA mouth of host CPU by DSP.
DSP makes a certain input signal enter A/D converter by switching multidiameter option switch, and the sampled data of acquisition is carried out electric weight as initial data and calculated and fault judgement; Electric weight calculates the effective value comprise voltage, electric current, residual voltage, zero-sequence current, active power, reactive power, apparent power, power factor (PF), phase angle, the sense of current etc.Fault judgement is mainly carried out phase fault, neutral point fault and low current grounding and is judged.
Memory in the system is made up of the static read/write memory SRAM of 512K byte and the flash memory FLASH RAM/EPROM of 512K byte electric erasable.SRAM is the work internal memory of host CPU, when the device power down, is powered to SRAM by the large capacitor of a farad, and the assurance interior data is not lost.Flash memory is the retainable memory of power down, preserves host CPU working procedure, dsp operation program and each system parameters.In the use, working service terminal downloads program is in FLASH as required.
Device at most can external 15 50/60Hz ac analogs and the input of 4 DC analogue quantities, PT, CT arbitrarily divide into groups in the ac analog, all interchange analog input amounts are all through transformer isolation, and the DC simulation input variable makes with light MOS switch (through flying electric capacity) and realizes isolating.
All analog input amounts are through the analog input transformer or fly the electric capacity conversion, and filtering then selects 16 high-speed a/d converters of input to be converted to digital quantity through multiplexer again, send DSP to handle with the form of serial data stream.
DSP needs the accurate sampling interval to the analysis of ac input signal, and host CPU is adjusted the output of timer by the variation of dynamic following work frequency, thereby by accurately controlling multiplexer (MUX and sampling hold circuit, guarantees the sampling of of ac.
The concrete working method of present embodiment comprises twocouese enclosed type direction overcurrent protection for adopting quick overcurrent protection, and twocouese allows the formula overcurrent protection.Their common feature is to adopt independent communication channel to finish the handshaking of protection.
As shown in Figure 8, two-way enclosed type direction overcurrent protection is the protection that utilizes fault current discriminating direction and fault current amplitude size principle to constitute, and the utilization master-protection philosophy constitutes complete protection for feed line fully.On distribution network, adopt optical fiber to constitute the handshaking loop between each electric adjacent FTU protection, every cover protection is only got in touch with adjacent protection.When fault took place, the failure judgement sense of current taked fault current positive direction signal acquiescence not send, and sends in the other direction and forbids operating the signal principle.Protection configuration moment quick-break, overcurrent, reclosing and after accelerated protection.
As shown in Figure 9, the supply power mode for single supply radiation and open loop operation adopts bilateral to allow overcurrent protection, is the quick overcurrent protection of two-way permission formula of utilizing fault current amplitude size principle to constitute.The overcurrent of low definite value starts sender, high value overcurrent starts tripgear.The same master of utilization-protection philosophy constitutes complete protection for feed line fully.On distribution network, adopt fiber-optic signal exchange loop between each electric adjacent FTU protection, every cover protection is only got in touch with adjacent protection.Adopt fault-free current signal acquiescence not send, have fault current to send the principle that allows actuating signal.Protection configuration moment quick-break, overcurrent, reclosing and after accelerated protection.
For fear of the passage contention occurring, guarantee the exchange of guard signal, present embodiment in communication unit, will protect and control system independent each other.Two kinds of concrete modes are arranged.First protection and control system have passage separately respectively; Its two for the protection and the control of control system passage divide work.
The control branch mode of operation structured flowchart of forced closing control communication system passage when Figure 10 shows protection work.Means of communication in the present embodiment is an optical fiber, owing to be non-dielectric, has the advantage of the anti-interference and high reliability of anti-surge, thunderbolt, induced voltage.Can realize the standby mutually of system by optical fiber self-healing ring mode in the system.
The communication of TTU is not associated with feed line automatization system, adopts the light MODEM of two RS-232C mouths, distributes a RS-232C passage separately.
Control merotype more complicated requires offside also to close simultaneously except that this side closure data channel.Otherwise offside is made mistakes and is retransmitted the contention passage.Adopt custom-designed dedicated optical MODEM, on the common light MODEM basis that has 3 RS-232C mouths, transform and form.Be provided with the level control mouth of a standard, input and output are the level signal of standard, and the transmission of M side and the transmission and the reception of reception and N side are arranged in the fiduciary level mouth.
When level was worked, other data services of MODEM suspended, and level signal has the highest priority limit.Simultaneously, in this light MODEM, being set to not to level signal, relaying transmits.
This light MODEM has three delivery outlets, and one of them passway is RS-232C, is used for data acquisition control, and another RS-232C is used for the TTU communication, and a designated lane mouth is used for level transmissions.
List uses optical fiber as communication system to fiber optic network control offshoot program; failure removal adopts two-way enclosed type directional current protection principle, and protection has realized quick-action completely, even losing under the situation of communication; also can correct operation, and perfect backup protection is arranged as guarantee.System reconfiguration device principle is adopted in fault recovery, makes system in the reconstruct that loses the system that finishes under the situation of communication, and can finish the Fault Isolation and the locking of system.Adopt the feed line automatization system of above-mentioned two technology, under the cooperation of reliable medium voltage breaker, can greatly improve the fail safe and the reliability of system.
Claims (6)
1, a kind of power distribution automation feed terminal unit is characterized in that being made up of the data communication unit and the operating unit of power subsystem, protected location, measurement and control unit, the communication of tape jam action message; Described protected location comprises Fourier fft analysis, High frequency filter and integral and calculating, and finishes and adjacent end exchange trouble action message with its analysis result with the analysis that numerical analysis circuit DSP finishes the fault sample information; Described measurement and control unit judges and assigns operational order and give operating unit with the fault message of CPU in conjunction with the next neighbouring device of communication unit exchange; The safety isolation and the system restoration that start failure removal that the power distribution network circuit breaker carries out distribution network, finish distribution fault point according to the direction and the failure removal information of incoming call with operating unit;
Wherein, the numerical analysis circuit comprises data acquisition, master data analysis and I/O expanded circuit, and its data acquisition is sent into dsp system by 8 road A/D converters; Measurement and control unit logic analysis circuit is made up of I/O expanded circuit, cpu circuit and light surround electric isolating circuit; Operating unit is formed the actuating signal output system by relay and photoelectric isolating circuit.
2, power distribution automation feed terminal unit according to claim 1; its feature adopts twocouese enclosed type direction overcurrent protection; on distribution network; adopt optical fiber to constitute the handshaking loop between each electric adjacent FTU protection; every cover protection is only got in touch with adjacent protection, when fault takes place, and the failure judgement sense of current; fault current positive direction signal acquiescence does not send, and sends in the other direction and forbids transporting signal.
3, power distribution automation feed terminal unit according to claim 1; it is characterized in that adopting twocouese to allow the formula overcurrent protection; on distribution network; adopt fiber-optic signal exchange loop between each electric adjacent FTU protection; every cover protection is only got in touch with adjacent protection; fault-free current signal acquiescence does not send, and has fault current to send and allows actuating signal.
According to the described power distribution automation feed terminal unit of claim 1, it is characterized in that in described communication unit that 4, protection system and control system are independent each other, have passage separately respectively, and the passage control divide work.
5, power distribution automation feed terminal unit according to claim 1 is characterized in that described function circuit forms the actuating signal output system by OMRON relay and photoelectric isolating circuit.
6, power distribution automation feed terminal unit according to claim 1, the state communicating circuit of it is characterized in that serial communication circuit that described communication unit sent by CPU, being isolated by INTEL 8255 and photoelectricity is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02292937 CN2624494Y (en) | 2002-12-20 | 2002-12-20 | Power distribution automation feeder line monitor terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02292937 CN2624494Y (en) | 2002-12-20 | 2002-12-20 | Power distribution automation feeder line monitor terminal |
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| CN2624494Y true CN2624494Y (en) | 2004-07-07 |
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| CN 02292937 Expired - Lifetime CN2624494Y (en) | 2002-12-20 | 2002-12-20 | Power distribution automation feeder line monitor terminal |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100504690C (en) * | 2006-08-08 | 2009-06-24 | 佑图物理应用科技发展(武汉)有限公司 | Light-adjusting and power distribution system used in full-function telestudio stage |
| CN102185300A (en) * | 2011-05-24 | 2011-09-14 | 安徽中兴继远信息技术有限公司 | On-spot feeder automation equipment and realizing method thereof |
| CN102306931A (en) * | 2011-09-15 | 2012-01-04 | 北京四方继保自动化股份有限公司 | Direct-current traction feed section region protection system and protection method |
| CN102510209A (en) * | 2011-10-28 | 2012-06-20 | 东南大学 | Digital power factor correction controller adopting time division multiplex analog-to-digital (A/D) converter |
| CN102709877A (en) * | 2011-03-22 | 2012-10-03 | 博西华电器（江苏）有限公司 | Household appliance |
| CN103532114A (en) * | 2013-10-25 | 2014-01-22 | 中国石油大学(华东) | Novel method for performing over-current protection on cascade radiation type distribution lines |
| CN104701979A (en) * | 2014-11-20 | 2015-06-10 | 许继集团有限公司 | Protective measurement and control integrated device and protective measurement and control method |
| CN107039954A (en) * | 2017-05-03 | 2017-08-11 | 张照滟 | A kind of electric power networks formula intelligent protection device |
| CN110416981A (en) * | 2019-07-31 | 2019-11-05 | 华北电力大学 | A kind of access power distribution network zone current guard method of electric car and system |
| CN110994564A (en) * | 2019-11-27 | 2020-04-10 | 积成电子股份有限公司 | Automatic selection and fixed value setting method for protection input switch of power distribution network |
| CN111562461A (en) * | 2020-03-30 | 2020-08-21 | 索亮 | Monitoring device, method and system of communication cable |
| CN111711276A (en) * | 2020-07-23 | 2020-09-25 | 珠海康晋电气股份有限公司 | Distribution automation intelligence feeder terminal |
| CN112649698A (en) * | 2020-12-09 | 2021-04-13 | 南京理工大学北方研究院 | Feeder automation test system |
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2002
- 2002-12-20 CN CN 02292937 patent/CN2624494Y/en not_active Expired - Lifetime
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100504690C (en) * | 2006-08-08 | 2009-06-24 | 佑图物理应用科技发展(武汉)有限公司 | Light-adjusting and power distribution system used in full-function telestudio stage |
| CN102709877A (en) * | 2011-03-22 | 2012-10-03 | 博西华电器（江苏）有限公司 | Household appliance |
| CN102185300A (en) * | 2011-05-24 | 2011-09-14 | 安徽中兴继远信息技术有限公司 | On-spot feeder automation equipment and realizing method thereof |
| CN102306931A (en) * | 2011-09-15 | 2012-01-04 | 北京四方继保自动化股份有限公司 | Direct-current traction feed section region protection system and protection method |
| CN102306931B (en) * | 2011-09-15 | 2013-12-25 | 北京四方继保自动化股份有限公司 | Direct-current traction feed section region protection system and protection method |
| CN102510209A (en) * | 2011-10-28 | 2012-06-20 | 东南大学 | Digital power factor correction controller adopting time division multiplex analog-to-digital (A/D) converter |
| CN102510209B (en) * | 2011-10-28 | 2013-10-30 | 东南大学 | Digital power factor correction controller adopting time division multiplex analog-to-digital (A/D) converter |
| CN103532114B (en) * | 2013-10-25 | 2016-01-20 | 中国石油大学(华东) | A kind of new method for carrying out overcurrent protection to cascade radiation type distribution line |
| CN103532114A (en) * | 2013-10-25 | 2014-01-22 | 中国石油大学(华东) | Novel method for performing over-current protection on cascade radiation type distribution lines |
| CN104701979A (en) * | 2014-11-20 | 2015-06-10 | 许继集团有限公司 | Protective measurement and control integrated device and protective measurement and control method |
| CN104701979B (en) * | 2014-11-20 | 2018-02-02 | 许继集团有限公司 | One kind protection observing and controlling integrating device and protection investigating method |
| CN107039954A (en) * | 2017-05-03 | 2017-08-11 | 张照滟 | A kind of electric power networks formula intelligent protection device |
| CN110416981A (en) * | 2019-07-31 | 2019-11-05 | 华北电力大学 | A kind of access power distribution network zone current guard method of electric car and system |
| CN110994564A (en) * | 2019-11-27 | 2020-04-10 | 积成电子股份有限公司 | Automatic selection and fixed value setting method for protection input switch of power distribution network |
| CN110994564B (en) * | 2019-11-27 | 2021-11-23 | 积成电子股份有限公司 | Automatic selection and fixed value setting method for protection input switch of power distribution network |
| CN111562461A (en) * | 2020-03-30 | 2020-08-21 | 索亮 | Monitoring device, method and system of communication cable |
| CN111562461B (en) * | 2020-03-30 | 2021-06-11 | 北京泰普科科技有限公司 | Monitoring device, method and system of communication cable |
| CN111711276A (en) * | 2020-07-23 | 2020-09-25 | 珠海康晋电气股份有限公司 | Distribution automation intelligence feeder terminal |
| CN112649698A (en) * | 2020-12-09 | 2021-04-13 | 南京理工大学北方研究院 | Feeder automation test system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121220 Granted publication date: 20040707 |