CN101713800A - Test method of digital substation relay protection device and special device thereof - Google Patents
Test method of digital substation relay protection device and special device thereof Download PDFInfo
- Publication number
- CN101713800A CN101713800A CN200910069835A CN200910069835A CN101713800A CN 101713800 A CN101713800 A CN 101713800A CN 200910069835 A CN200910069835 A CN 200910069835A CN 200910069835 A CN200910069835 A CN 200910069835A CN 101713800 A CN101713800 A CN 101713800A
- Authority
- CN
- China
- Prior art keywords
- protection device
- sampling
- relay protection
- media
- mixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010998 test method Methods 0.000 title abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 101
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000009432 framing Methods 0.000 claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims description 25
- 238000000926 separation method Methods 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 3
- 230000003442 weekly effect Effects 0.000 description 5
- 230000006855 networking Effects 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention relates to a test method of a digital substation relay protection device. The test method is characterized in that the method comprises the following steps: (1) a digital relay protection tester generates groups of sampling messages to transmit to a CPU module; (2) when the number of sampling messages meets the sending demand, the CPU module sends the group of sampling messages to a plurality of network modules; (3) after all network modules receive the sampling messages, framing is performed according to the priority, VLAN ID and multicast address which are preset in the sampling messages, then data are sent to a network exchange module; (4) the network exchange module receives data and outputs from an output terminal, the output data are converted by an electronic-to-optical conversion chip and transmitted to single-interval or multi-interval relay protection device through optical fiber; and (5) the step (1)-(4) are repeated, thus realizing that the sampling messages are accessed to the single-interval or multi-interval relay protection device so as to complete the test. The invention has simple structure, is convenient to use and is applicable to the test of the single-interval or multi-interval relay protection device.
Description
Technical field
The invention belongs to field of electrical equipment, especially a kind of method of testing of digital substation relay protection device and isolated plant thereof.
Background technology
Digital transformer substation adopts two kinds of sampled value Packet Transfer Modes usually.A kind of is sampled value point-to-point transmission pattern, and a kind of is sampled value networking transmission mode.In first kind of ad hoc mode, the sampled value message of monospace equipment is directly inserted by merge cells (MU, Merging Unit), for multi-compartment equipment, each interval sampling value message inserts data concentrator by merge cells, merges into behind the Frame access device again.Its advantage is concisely clear, simple synchronously for sampling message transmissions path, and it is convenient to realize, shortcoming is that sampled data can not be shared, and wiring is loaded down with trivial details, relates to proprietary protocol.In second kind of sampled value networking model, each interval sampling value message is by the direct access switch of MU, and monospace and multi-compartment equipment are accepted required sampling message on switch.Its advantage is to have realized that sampled data is shared, and wiring is simple, based on international standard protocol.Along with the progress of digital transformer substation network optimization design and simultaneous techniques, the sampled value networking model becomes main flow gradually, has obtained using widely.
Relay protection device is an of paramount importance equipment in the transformer station secondary system, and any change that relates to protection equipment all will just can be incorporated into the power networks through function test.The protective device that relates to multi-compartment for tranformer protection and bus differential protecting etc., two kinds of test methods are generally arranged, first kind be the traditional relay protection tester through electro-optic device, each phase electric weight is inserted merge cells, insert protective device by merge cells through switch again; Second kind is directly to generate the sampling message identical with the merge cells frame structure by the digital relay protection tester, inserts protective device through the wall switch.First kind of scheme needs a series of equipment cooperations just can finish; in case transformer station formally puts into operation; certain protective device maintenance just need also stop transport relevant merge cells and switch to get off to do experiment; this mode can influence the normal operation of transformer station, has influenced continuity, the continuation of power supply.In second kind of scheme, existing digital protecting tester can only be exported the accurate monospace sampling of road sign message, for the multi-compartment protection, needs the tester more than two to insert protective device through switch, has increased the cost expenditure, has caused unnecessary waste.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art; provide simple in structure, easy to use and both be fit to the test job of monospace relay protection device, can realize a kind of method of testing of digital substation relay protection device of the synchronism detection of multi-compartment relay protection device again.
This method of testing may further comprise the steps:
(1) the digital protective relay tester generates how group sampling messages are sent in the CPU module;
(2) when the satisfied transmission of the quantity of sampling message requires, the CPU module is sent to a plurality of mixed-media network modules mixed-medias with this batch sampling message;
(3) after each mixed-media network modules mixed-media all received the sampling message, according to the priority, VLAN ID and the multicast destination address framing that set in advance in the sampling message, the data behind the framing sent to network exchange module;
(4) network exchange module is exported by output port after receiving data, and the data of output are sent to monospace or multi-compartment relay protection device through optical fiber after the conversion of electric light conversion chip;
(5) repeating step (1)～(4) had both been realized the access of monospace or multi-compartment relay protection device sampling message, and then had been finished test.
And, when storing, stores the sampling message in the described step (1) according to the order of affiliated separation dot, and n the affiliated separation dot of sampling message is:
Wherein, N is a space-number.
And the quantity of the sampling message in the described step (2) is 1～N.
And the quantity of mixed-media network modules mixed-media is more than or equal to N in the described step (2).
Another object of the present invention provides a kind of isolated plant of using above-mentioned method of testing.
This isolated plant comprises the digital protective relay tester; the output terminal of digital protective relay tester connects the input end of a CPU module; the output terminal of CPU module connects the input end of at least one mixed-media network modules mixed-media; the output terminal of each mixed-media network modules mixed-media connects the input end of a network exchange module; the output terminal of network exchange module connects the input end of an electrooptic conversion module, and the output terminal of electrooptic conversion module connects monospace or multi-compartment relay protection device.
And the quantity of described mixed-media network modules mixed-media is more than or equal to space-number.
And the quantity of the input end of described network exchange module equals the quantity of mixed-media network modules mixed-media.
Advantage of the present invention and good effect are:
1. the CPU module in this method is responsible for the sampling message of buffer memory digital protective relay tester output and is write in order in the buffer memory in the mixed-media network modules mixed-media; the value of the quantity of the sampling message that the CPU module receives can be from 1 to space-number to be tested; whole process is finished automatically; realized that a plurality of sampling messages are sent to the purpose of relay protection device in the different interval by subsequent module, solved the problem that a simple digital protective relay tester can only generate a sampling message.
2. the quantity of the mixed-media network modules mixed-media in this method is more than or equal to space-number to be tested, a plurality of sampling messages by the CPU module forwards are received and are sent in the network exchange module by mixed-media network modules mixed-media arranged side by side, because the writing speed of CPU is very fast, the synchronous stand-by period between a plurality of mixed-media network modules mixed-medias will be far smaller than the sampling period, has guaranteed accuracy and real-time that the sampling message transmits.
3. the network exchange module in this method has the input port with the mixed-media network modules mixed-media equal number, each input port is responsible for receiving the sampling message that coupled mixed-media network modules mixed-media transmits, its inbound pacing is fast, network exchange module has only an output port, and all sampling messages are exported by output port in order.What this network exchange module was used is 100,000,000 exchange chips, because it does not have complicated switching task, each message forward delay interval of sampling will be far smaller than the sampling period, has satisfied the message of the sampling on the same group delay requirement of relay protection device.
4. each chip in this method only is responsible for the directive sending of sampling message, all can cooperate well with various sampling message frame forms, no matter be international standard protocol or proprietary protocol, it is applied widely, it is convenient to be suitable for, saved investment.
5. the present invention is by combining digital protective relay tester, CPU module, mixed-media network modules mixed-media and network exchange module; based on sampled value networking transmission mode; realized the synchronism detection of monospace relay protection device and multi-compartment relay protection device; having avoided conventional test methodologies must shut down the defective of test, is that a kind of can to satisfy that tranformer protection " high, medium and low " or " high, medium and low, low " require, also can satisfy bus differential protecting largest interval number be the proving installation of the relay protection device of even number requirement.
Description of drawings
Fig. 1 is a work synoptic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
A kind of method of testing of digital substation relay protection device may further comprise the steps:
1. the digital protective relay tester generates that many group sampling messages are sent in the CPU module (chip is Motorola MPC 8313) and writes buffer memory according to the order of affiliated separation dot.The affiliated separation dot of each sampling message is defined as follows:
N the affiliated separation dot of sampling message is:
Wherein, N is a space-number.
After pressing intact N the sampling message of separation dot sequential storage in the buffer memory of CPU module, the CPU module continues to receive sample message and according to the sequential storage of separation dot of N of next group.
2. when the quantity of sampling message in the CPU module buffer memory equaled space-number N, this N sampling message removed in the message queue of the N that has been sent out sampling message from CPU module buffer memory according in the sampling period buffer memory that is sent to mixed-media network modules mixed-media in batch.
Sampling period is: 20ms/ is the sampling number of ripple weekly.
3. mixed-media network modules mixed-media is made up of M Intel LXT 971 chips, is coordination between each chip.Consider to relate to maximum at interval required space-number N of defencive function experiment, M 〉=N should be arranged.In case be written into the sampling message in the buffer memory of chip, each chip promptly according to the priority that sets, VLAN ID and multicast destination address framing, sends to network exchange module with the data behind the framing simultaneously, and each chip empties buffer memory after sending and finishing immediately.Because host CPU module writing speed is very fast, the synchronous stand-by period of each chip will be far smaller than the sampling period.
4. network exchange module is exported by output port after receiving data, and the data of output are sent to monospace or multi-compartment relay protection device through optical fiber after the conversion of electric light conversion chip.
5. by sampling period repeating step (1)～(4), both realized the access of monospace or multi-compartment relay protection device sampling message, and then finished test.
Used specialized equipment in the said method; this equipment is (dotted portion) as shown in fig. 1; comprise the digital protective relay tester; the output terminal of this digital protective relay tester connects the input end of a CPU module; the output terminal of CPU module connects the input end of at least one mixed-media network modules mixed-media; the output terminal of each mixed-media network modules mixed-media connects the input end of a network exchange module; the output terminal of network exchange module connects the input end of an electrooptic conversion module, and the output terminal of electrooptic conversion module connects the sampled value input port of monospace or multi-compartment relay protection device.
The quantity of mixed-media network modules mixed-media is more than or equal to space-number.The quantity of the input end of network exchange module equals the quantity of mixed-media network modules mixed-media.The chip that the CPU module is used is Motorola MPC 8313.The chip that mixed-media network modules mixed-media uses is Intel LXT 971.The chip that network exchange module is used is Marvell 88E 6095.The chip that electrooptic conversion module uses is Avago HFBR 5961.
Application Example 1
Testing location: certain digital transformer substation
Need the sampling interval number of access: 2
The multi-compartment relay protection device is: the iPACS-5941D tranformer protection
Device therefor: digital protective relay tester PWF-2, CPU module Motorola MPC 8313, mixed-media network modules mixed-media Intel LXT 971, network exchange module Marvell 88E 6095, electric light conversion chip Avago HFBR 5961.
The multicast address of high-pressure side interval sampling message is 01-0C-CD-01-00-22, and VLAN ID is 3, and priority is 6;
The multicast address of medium voltage side interval sampling message is 01-0C-CD-01-00-11, and VLAN ID is 3, and priority is 6;
The step of test process comprises:
1. electrooptic conversion module is connected optical fiber, the other end of this optical fiber connects tranformer protection sampling interface.
2. digital protective relay tester energising; the digital protective relay tester generates periodically, and 2 interval sampling messages are sent in the CPU module buffer memory; CPU is according to sampling period (ripple 100 points weekly; be the cycle to be: the 20ms/100 point=0.2ms) control sends; phase is read in 2 sampling messages weekly; interval, respectively corresponding high-pressure side and low-pressure side interval, the separation dot under each sampling message is as follows:
N sampling message corresponding intervals number is:
3.CPU will read 2 sampling messages write in interval number corresponding network chip, write after finishing and will remove in its message queue from CPU module buffer memory.
4. mixed-media network modules mixed-media is made up of 4 Intel LXT 971 chips, is coordination between each chip.Because this tests required sampling interval number is 2, therefore have only the 1st and No. 2 network chip to enable.In the buffer memory of chip, be written into the sampling message, each chip is promptly according to the priority that sets, VLAN ID and multicast destination address framing, simultaneously the sampling message behind the framing is sent to network exchange module under the unified instruction of CPU, each chip empties buffer memory after sending and finishing immediately.Because host CPU module writing speed is very fast, the synchronous stand-by period of each chip will be far smaller than the sampling period.
5. network exchange module receives 2 sampling messages that network chip sends; be temporary in the buffer memory in proper order by arrival; by unique output port exchange output, the data of output are sent to iPACS-5941D tranformer protection equipment through optical fiber after the conversion of electric light conversion chip.
6. by sampling period repeating step (1)～(5), both realized that 2 required interval sampling messages of tranformer protection test inserted.
Through multiple authentication, the high-pressure side and the medium voltage side sampling message that are produced by the digital protective relay tester all are sent to tranformer protection equipment normally, and the protected device of this sampling message is confirmed as the efficiently sampling data and realized test event.Hence one can see that, and the present invention's message output inserter of sampling can independently be realized the access of multi-compartment sampled data.
Application Example 2
Testing location: certain digital transformer substation
Need the sampling interval number of access: 3
The multi-compartment relay protection device is: the CSC150E bus differential protecting
Device therefor: digital protective relay tester PWF-2, CPU module Motorola MPC 8313, mixed-media network modules mixed-media Intel LXT 971, network exchange module Marvell 88E 6095, electric light conversion chip Avago HFBR 5961
The multicast address of Line 1 road interval sampling message is 01-0C-CD-01-00-01, and VLAN ID is 2, and priority is 6;
The multicast address of No. 2 line segregation sampling messages is 01-0C-CD-01-00-02, and VLAN ID is 4, and priority is 6;
The multicast address of No. 3 line segregation sampling messages is 01-0C-CD-01-00-03, and VLAN ID is 9, and priority is 6;
The step of test process comprises:
1. electrooptic conversion module is connected optical fiber, the other end connection bus differential protection sampling interface of this optical fiber.
2. digital protective relay tester energising; the digital protective relay tester generates periodically, and 3 interval sampling messages are sent in the CPU module buffer memory; CPU is according to sampling period (ripple 96 points weekly; be the cycle to be: the 20ms/96 point=0.208ms) control sends; phase is read in 3 sampling messages weekly; respectively corresponding 3 line segregations, the separation dot under each sampling message is as follows:
N sampling message corresponding intervals number is:
3.CPU will read 3 sampling messages write in interval number corresponding network chip, write after finishing and will remove in its message queue from CPU module buffer memory.
4. mixed-media network modules mixed-media is made up of 4 Intel LXT 971 chips, is coordination between each chip.Because to test required sampling interval number be 3 for this, therefore have only the 1st, No. 2 and No. 3 network chip enabled.In the buffer memory of chip, be written into the sampling message, each chip is promptly according to the priority that sets, VLAN ID and multicast destination address framing, simultaneously the sampling message behind the framing is sent to network exchange module under the unified instruction of CPU, each chip empties buffer memory after sending and finishing immediately.Because host CPU module writing speed is very fast, the synchronous stand-by period of each chip will be far smaller than the sampling period.
5. network exchange module receives 3 sampling messages that network chip sends; be temporary in the buffer memory in proper order by arrival; by unique output port exchange output, the data of output are sent to CSC150E bus differential protecting equipment through optical fiber after the conversion of electric light conversion chip.
6. by sampling period repeating step (1)～(5), both realized that 3 required interval sampling messages of bus differential protecting test inserted.
Through multiple authentication, 3 line segregation sampling messages that produced by the digital protective relay tester all are sent to bus differential protecting equipment normally, and the protected device of this sampling message is confirmed as the efficiently sampling data and realized test event.Hence one can see that, and the present invention's message output inserter of sampling can independently be realized the access of multi-compartment sampled data.
Claims (6)
1. the method for testing of a digital substation relay protection device, it is characterized in that: this method may further comprise the steps:
(1) the digital protective relay tester generates how group sampling messages are sent in the CPU module;
(2) when the satisfied transmission of the quantity of sampling message requires, the CPU module is sent to a plurality of mixed-media network modules mixed-medias with this batch sampling message;
(3) after each mixed-media network modules mixed-media all received the sampling message, according to the priority, VLAN ID and the multicast destination address framing that set in advance in the sampling message, the data behind the framing sent to network exchange module;
(4) network exchange module is exported by output port after receiving data, and the data of output are sent to monospace or multi-compartment relay protection device through optical fiber after the conversion of electric light conversion chip;
(5) repeating step (1)～(4) had both been realized the access of monospace or multi-compartment relay protection device sampling message, and then had been finished test.
And, when storing, stores the sampling message in the described step (1) according to the order of affiliated separation dot, and n the affiliated separation dot of sampling message is:
Wherein, N is a space-number.
2. the method for testing of a kind of digital substation relay protection device according to claim 1, it is characterized in that: the quantity of the sampling message in the described step (2) is 1～N.
3. the method for testing of a kind of digital substation relay protection device according to claim 1 is characterized in that: the quantity of mixed-media network modules mixed-media is more than or equal to N in the described step (2).
4. the isolated plant of the method for testing of a kind of digital substation relay protection device as claimed in claim 1; comprise the digital protective relay tester; it is characterized in that: the output terminal of this digital protective relay tester connects the input end of a CPU module; the output terminal of CPU module connects the input end of at least one mixed-media network modules mixed-media; the output terminal of each mixed-media network modules mixed-media connects the input end of a network exchange module; the output terminal of network exchange module connects the input end of an electrooptic conversion module, and the output terminal of electrooptic conversion module connects monospace or multi-compartment relay protection device.
5. the proving installation of a kind of relay protection device according to claim 1, it is characterized in that: the quantity of described mixed-media network modules mixed-media is more than or equal to space-number.
6. the proving installation of a kind of relay protection device according to claim 1, it is characterized in that: the quantity of the input end of described network exchange module equals the quantity of mixed-media network modules mixed-media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100698351A CN101713800B (en) | 2009-07-22 | 2009-07-22 | Test method of digital substation relay protection device and special device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100698351A CN101713800B (en) | 2009-07-22 | 2009-07-22 | Test method of digital substation relay protection device and special device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101713800A true CN101713800A (en) | 2010-05-26 |
| CN101713800B CN101713800B (en) | 2012-01-04 |
Family
ID=42417610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100698351A Active CN101713800B (en) | 2009-07-22 | 2009-07-22 | Test method of digital substation relay protection device and special device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101713800B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291277A (en) * | 2011-08-09 | 2011-12-21 | 上海思源弘瑞自动化有限公司 | Automatic test system and method for intelligent substation spacing apparatus |
| CN102636708A (en) * | 2012-03-27 | 2012-08-15 | 许继集团有限公司 | Intelligent substation process layer network simulating system and device simulator |
| CN102692576A (en) * | 2012-06-15 | 2012-09-26 | 黑龙江省电力有限公司检修公司 | Relay protection periodical inspection method |
| CN103267918A (en) * | 2013-06-09 | 2013-08-28 | 国家电网公司 | In-place installed remote debugging system and in-place installed remote debugging method for relay protective device |
| CN103983878A (en) * | 2014-06-05 | 2014-08-13 | 贵州电力试验研究院 | Relay protection synchronization performance testing system and method based on random discrete time domain |
| CN104142471A (en) * | 2013-09-05 | 2014-11-12 | 国家电网公司 | Measuring device for action delay of dry contact of electronic equipment |
| CN111800313A (en) * | 2020-07-03 | 2020-10-20 | 国网四川省电力公司电力科学研究院 | Method for testing message output performance of digital relay protection tester |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201127028Y (en) * | 2007-12-19 | 2008-10-01 | 华东电网有限公司 | Time synchronization system transferring time through synchronous digital hierarchy optical communications network |
| CN101430355B (en) * | 2008-11-05 | 2012-04-25 | 江西省电力科学研究院 | Progressive search type digitized relay protection electromagnetic transient simulation test method |
-
2009
- 2009-07-22 CN CN2009100698351A patent/CN101713800B/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291277A (en) * | 2011-08-09 | 2011-12-21 | 上海思源弘瑞自动化有限公司 | Automatic test system and method for intelligent substation spacing apparatus |
| CN102291277B (en) * | 2011-08-09 | 2013-06-19 | 上海思源弘瑞自动化有限公司 | Automatic test system and method for intelligent substation spacing apparatus |
| CN102636708A (en) * | 2012-03-27 | 2012-08-15 | 许继集团有限公司 | Intelligent substation process layer network simulating system and device simulator |
| CN102692576A (en) * | 2012-06-15 | 2012-09-26 | 黑龙江省电力有限公司检修公司 | Relay protection periodical inspection method |
| CN103267918A (en) * | 2013-06-09 | 2013-08-28 | 国家电网公司 | In-place installed remote debugging system and in-place installed remote debugging method for relay protective device |
| CN103267918B (en) * | 2013-06-09 | 2016-04-13 | 国家电网公司 | A kind of remote debugging system of site mount type protective relaying device and method |
| CN104142471A (en) * | 2013-09-05 | 2014-11-12 | 国家电网公司 | Measuring device for action delay of dry contact of electronic equipment |
| CN103983878A (en) * | 2014-06-05 | 2014-08-13 | 贵州电力试验研究院 | Relay protection synchronization performance testing system and method based on random discrete time domain |
| CN103983878B (en) * | 2014-06-05 | 2016-09-14 | 贵州电力试验研究院 | Relay protection net synchronization capability based on Random Discrete time domain test system and method |
| CN111800313A (en) * | 2020-07-03 | 2020-10-20 | 国网四川省电力公司电力科学研究院 | Method for testing message output performance of digital relay protection tester |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101713800B (en) | 2012-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101713800B (en) | Test method of digital substation relay protection device and special device thereof | |
| CN201518052U (en) | Portable all-digital relay protection transient closed-loop tester | |
| CN102857397B (en) | The how main asynchronous duplex differential bus of one and the means of communication | |
| CN103840993A (en) | Dual-redundancy CAN bus data transmission method | |
| CN105573239A (en) | High speed backboard bus communication control device and method | |
| CN101296131B (en) | Method, device and system for testing switchboard connectivity | |
| CN104618208A (en) | Elastic data interaction comprehensive bus system | |
| CN103490966A (en) | Dual-redundancy CAN bus data receiving and processing method | |
| WO2020109867A3 (en) | Multi-mode communication device, method and system | |
| CN111212131A (en) | Device for realizing multi-core modular expansion internet of things proxy based on carrier communication | |
| CN103001820A (en) | Online measuring alarming method based on intelligent substation switch latency | |
| KR101870492B1 (en) | Programmable Logic Controller System | |
| CN201464574U (en) | Test device of relay protection equipment | |
| CN103106177B (en) | Interconnect architecture and method thereof on the sheet of multi-core network processor | |
| CN103685262A (en) | Heterogeneous network communication adapter | |
| CN104281417A (en) | Distributed printing system and method for transformer substation device | |
| CN206332674U (en) | A kind of Ethernet switch wiring board | |
| CN201322872Y (en) | Intelligent communication management device for automatic power system | |
| CN201867791U (en) | Vehicle-mounted ATP safety computer used for track traffic | |
| CN207304023U (en) | A kind of photovoltaic DC-to-AC converter based on high speed Ethernet industrial bus | |
| CN206946259U (en) | Measure and control device based on the switching of double gps satellite positioning system signal source interfaces | |
| CN206353725U (en) | A kind of expansible intelligent substation three-layer network message accounting analytical equipment | |
| CN105391487B (en) | Satellite link time delay simulator based on FPGA | |
| CN220323772U (en) | Industrial control system | |
| CN202888961U (en) | Communication terminal for power distribution network overhead line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121127 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121127 Address after: 300010 Tianjin city Hebei District Wujing Road No. 39 Patentee after: Tianjin Electric Power Corp. Patentee after: State Grid Corporation of China Address before: 300010 Tianjin city Hebei District Wujing Road No. 39 Patentee before: Tianjin Electric Power Corp. |