CN101504435A - Detection apparatus and method for relay protection digital channel - Google Patents
Detection apparatus and method for relay protection digital channel Download PDFInfo
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- CN101504435A CN101504435A CNA2009100784198A CN200910078419A CN101504435A CN 101504435 A CN101504435 A CN 101504435A CN A2009100784198 A CNA2009100784198 A CN A2009100784198A CN 200910078419 A CN200910078419 A CN 200910078419A CN 101504435 A CN101504435 A CN 101504435A
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Abstract
The invention discloses a detection device for relay protection digital channels, which comprises an input interface module, an alarm and error code detection module and an output interface module, and also comprises at least one of a data cache and time delay insertion module and an alarm and error code insertion module, wherein the input interface module is used for receiving digital signals to be detected sent by a relay protection device; the alarm and error code detection module is used for performing alarming and error code detection on the digital signals to be detected; the data cache and time delay insertion module is used for performing caching and time delay insertion on the digital signals to be sent; the alarm and error code insertion module is used for performing alarming and error code insertion on the digital signals to be sent; and the output interface module is used for outputting the digital signals to be sent which are processed by the data cache and time delay insertion module and/or the alarm and error code insertion module to the relay protection device. The invention discloses a detection method for the relay protection digital channels at the same time. The detection device and detection method have complete detection functions and high accuracy.
Description
Technical field
The present invention relates to a kind of pick-up unit and method of relay protection digital channel.
Background technology
For guaranteeing the safe operation of electric power facility, power telecom network is guaranteeing to have done a lot of useful work aspect its security, the reliability.But at present online protective relaying device still owing to phenomenons such as switching unusually appears in various reasons, malfunctions, brings hidden danger for the safe operation of power network.
Protective relaying device occurs unusual, and partly cause is clear and definite, but still has partly cause to determine.For agnogenic situation, can't suit the remedy to the case and deal with problems.Find that in the reality operation when malfunction appearred in protective relaying device, communication network was not interrupted, and error code may just occur.Protective relaying device generally locking can occur when the bit error rate reaches certain rank; at this moment device is can malfunction; but whether this rank is provided with rationally; whether there is a dark space; perhaps there are some special error code conditions; make protective relaying device not reach the condition of locking, but may malfunction occur owing to packet makes a mistake.Therefore be necessary this problem is done enough experiments to study.
The defectiveness of T shape algorithm of the vertical difference that present protective relaying device generally adopts own as restricted to two-way delay inequality, when two-way delay inequality is asymmetric, then the device cisco unity malfunction may occur.But in reality, often there is asymmetry in bidirectional line, as SDH (Synchronous Digital Hierarchy) (SDH, SynchronousDigital Hierarchy) Self-healing Rings etc.But not means of testing easily of great asymmetry can bear on earth to separately protective relaying device in protective relaying device producer.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of pick-up unit and method of relay protection digital channel, can simulate the various testing conditions in the relay protection digital channel, to finish the Performance Detection to protective relaying device.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of pick-up unit of relay protection digital channel, comprise input interface module, alarm and error code detection module, output interface module, described pick-up unit also comprises at least one in metadata cache and time delay insert module, alarm and the error code insert module, wherein, described input interface module is used to receive the digital signal to be detected that protective relaying device sends; Described alarm and error code detection module are used for described digital signal to be detected is alarmed detection with error code; Described metadata cache and time delay insert module are used for carrying out buffer memory and inserting time delay to sent digital signal; Described alarm and error code insert module are used for alarming insertion with error code to sent digital signal; Described output interface module is used for the digital signal to be sent after described metadata cache and time delay insert module and/or described alarm and the processing of error code insert module is exported to by its destination address the protective relaying device of this destination address correspondence.
Preferably, described alarm and error code detection module comprise alarm detection submodule and Error detection submodule, wherein, described alarm detection submodule is used to detect dropout (LOS) alarm of digital signal, (AIS) alarm " 1 " entirely, LOF (LOF) is alarmed, the alarm of cyclic redundancy check (CRC) (CRC-4) Loss Of Multiframe; Described Error detection submodule is used to detect the coding error code and the CRC-4 piece error code of digital signal.
Preferably, described metadata cache and time delay insert module comprise time delay insertion submodule, and described time delay is inserted submodule and is used for digital signal is increased or the minimizing time delay, and described time delay comprises 0 to 50 millisecond instantaneous time delay and 50 milliseconds to 1 second time delay in short-term.
Preferably, described alarm and error code insert module comprise that error code inserts submodule and submodule is inserted in alarm, and described error code inserts submodule and is used for inserting time span that start time, error code insert magnitude and insert error code at every turn by predefined error code and carries out error code and insert; Described alarm is inserted submodule according to the start time of each insertion, each kind and each time span of inserting alarm of inserting alarm, alarms insertion.
Preferably, described alarm is when to insert the time span that submodule inserts alarm at every turn be 0 to 50 millisecond instantaneous, 50 milliseconds to 1 second long in short-term or more than 1 second; Described error code inserts time span that submodule inserts error code at every turn when being 0 to 50 millisecond instantaneous, 50 milliseconds to 1 second long in short-term or more than 1 second; Described error code inserts magnitude and comprises 10
-2, 10
-3, 10
-4, 10
-5, 10
-6And 10
-7
Preferably, described digital signal is to meet the Bureau of Standards of the international telecommunication union telecommunication G.703 64kbit/s of standard or the digital signal of 2048kbit/s, or for meeting G.703 and the G.704 framing digital signal of the 2048kbit/s of standard of the Bureau of Standards of international telecommunication union telecommunication.
A kind of detection method of relay protection digital channel comprises:
In detecting data, insert at least a in time delay, alarm data and the error code data, and described detection data are sent to protective relaying device; Wherein, inserting time delay promptly inserts timetable by the time delay of setting and inserts instantaneous in mailing to the detection data of described protective relaying device or time delay in short-term; Insert alarm, loss of signal alarm, complete " 1 " data, LOF alarm, the alarm of cyclic redundancy check (CRC) Loss Of Multiframe soon inserted timetable by the alarm of setting and is inserted in the described detection data, insert error code, be about to error code and insert the error code that timetable is inserted in the described detection data or magnitude is set in insertion in described detection data by the error code of setting; And
Detection data after the described protective relaying device processing that receives are alarmed and Error detection the output testing result.
Preferably, the described time delay duration that inserts timetable is spaced apart 0 to 50 millisecond instantaneous or 50 milliseconds to 1 second in short-term; When described alarm and error code insert the timetable duration and are spaced apart 0 to 50 millisecond instantaneous, 50 milliseconds to 1 second long in short-term or more than 1 second; Described error code magnitude comprises 10
-2, 10
-3, 10
-4, 10
-5, 10
-6And 10
-7
Preferably, described detection data are to meet the Bureau of Standards of the international telecommunication union telecommunication G.703 64kbit/s or the 2048kbit/s digital signal of standard, or for meeting G.703 and the G.704 framing digital signal of the 2048kbit/s of standard of the Bureau of Standards of international telecommunication union telecommunication.
The present invention can simulate SDH network, PDH (PDH; Plesiochronous DigitalHierarchy) network, telecommunication circuit multiplexing equipment or pulse code modulation (PCM) (PCM; Pulse CodeModulation) the various degree of impairments of multiplexer relay protection digital channel; and then accurately detect the influence of the various damages of relay protection digital channel to protective relaying device; promptly when various damage appearred in relay protection digital channel, whether protective relaying device had produced various mistaken verdicts or misoperation.The present invention can be provided with the generation sequence of relay protection digital channel injury event such as alarm, error code, time-delay etc. flexibly, and the present invention has guaranteed that the measuring ability of pick-up unit of relay protection digital channel is complete, accuracy is high, speed piece, cost are low.
Description of drawings
Fig. 1 is the application structure synoptic diagram of pick-up unit of the relay protection digital channel of the embodiment of the invention;
Fig. 2 is the composition structural representation of pick-up unit of the relay protection digital channel of the embodiment of the invention;
Fig. 3 is the process flow diagram of detection method of the relay protection digital channel of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated.
Fig. 1 is the application structure synoptic diagram of pick-up unit of the relay protection digital channel of the embodiment of the invention; as shown in Figure 1; the pick-up unit of the relay protection digital channel of the embodiment of the invention is applied in the circuit between the protective relaying device; receive the two-way that protective relaying device sends simultaneously and meet the ITU-T G.703 64kbit/s or the 2048kbit/s digital signal of standard; or meet G.703 and the G.704 framing digital signal of the 2048kbit/s of standard of ITU-T; the pick-up unit of the embodiment of the invention is monitored received two ways of digital signals; simultaneously according to predefined different event programmed sequence; the data that every road is received regularly increase or reduce time delay respectively; the data that receive are regularly inserted the error code of various magnitudes; various alarms etc.; simulate the transmission impairment and the propagation delay time situation of relay protection digital channel with this; at last two ways of digital signals is sent to protective relaying device; finally detect the influence of relay protection digital channel damage to protective relaying device; promptly when various damage appearred in relay protection digital channel, whether protective relaying device had produced various mistaken verdicts or malfunction.Because protective relaying device is a dual-mode, therefore, the pick-up unit of the relay protection digital channel of the embodiment of the invention is supported the double nip transmitting-receiving.Receive the digital signal that the digital transmission interface of protective relaying device 1 sends by the digital received interface; and this digital signal detected; if digital signal is without any alarm; then according to predefined different event programmed sequence; this digital timing signal is increased or reduces time delay quantitatively; and the error code and the various alarm of on this digital signal, regularly inserting various magnitudes; the last digital received interface that sends to protective relaying device 2 again; equally; receive the digital signal that the digital transmission interface of protective relaying device 2 sends by the digital received interface; and this digital signal detected; if digital signal is without any alarm; then according to predefined different event programmed sequence; this digital timing signal is increased or reduces time delay; the error code and the various alarm of regularly inserting various magnitudes on this digital signal are sending to the digital received interface of protective relaying device 1 at last.The digital circuit interface of the present invention and protective relaying device is to meet G.703 standard of ITU-T, based on 2048kbit/s digital circuit interface or based on the interface of 64kbit/s digital circuit.Below describe structure of the present invention and principle of work in detail.
Fig. 2 is the composition structural representation of pick-up unit of the relay protection digital channel of the embodiment of the invention; as shown in Figure 2; the pick-up unit of the relay protection digital channel of the embodiment of the invention comprises input interface module 20; alarm and error code detection module 21; output interface module 24; and metadata cache and time delay insert module 22; in alarm and the error code insert module 23 at least one; wherein; input interface module 20 is used to receive the digital signal to be detected that protective relaying device sends; G.703 the 64kbit/s digital signal or the two-way of standard meet the G.703 2048kbit/s digital signal of standard of ITU-T to the ITU-T that meets that reception two-way protective relaying device sends; this two ways of digital signals is through amplifying; balanced; signal decoding and Clock Extraction; obtain two-way and receive data; and the two-way receive clock that extracts receives data with this two-way then and receive clock is sent to alarm and error code detection module 21.Alarm and error code detection module 21 are used for described digital signal to be detected is alarmed detection with error code, described alarm and error code detection module comprise alarm detection submodule and Error detection submodule, wherein, described alarm detection submodule is used to detect dropout (LOS) alarm of digital signal, (AIS) alarm " 1 " entirely, LOF (LOF) alarm, the alarm of cyclic redundancy check (CRC) (CRC-4) Loss Of Multiframe, the alarm detection submodule receives two-way reception data and the receive clock that input interface module 20 is sent here, preestablishing digital signal is to meet the G.703 2048kbit/s digital signal of standard of ITU-T, then detect dropout and complete " 1 " alarm of receiving data, particularly, meet G.703 and the G.704 2048kbit/s digital signal of standard of ITU-T if preestablish digital signal and be, then detect the LOS alarm, ais alarm and LOF alarm, G.703 and G.704 meet ITU-T the 2048kbit/s digital signal and the band cyclic redundancy check (CRC) (CRC-4) of standard if preestablish digital signal and be, then detect the LOS alarm, ais alarm, the LOF alarm, the alarm of CRC-4 Loss Of Multiframe, if preestablish digital signal is to meet the G.703 64kbit/s digital signal of standard of ITU-T, only detects the LOS alarm.If the reception data of confirming to decode are without any alarm, the reception data that then will receive mail to the Error detection submodule, if find to receive data alarm are arranged, and then use complete " 1 " data to substitute the reception data that alarm is arranged, and mail to the Error detection submodule.Described Error detection submodule is used to detect the coding error code and the CRC-4 piece error code of digital signal, if preestablish digital signal is to meet the G.703 2048kbit/s digital signal of standard of ITU-T, then detect coding (Code) error code, meet G.703 and the G.704 2048kbit/s framing digital signal of standard of ITU-T if preestablish digital signal and be, and band CRC-4, then detect Code error code and CRC-4 piece error code, if preestablish digital signal is to meet the G.703 64kbit/s digital signal of standard of ITU-T, then detects coding (Code) error code.Metadata cache and time delay insert module 22 are used for carrying out buffer memory and inserting time delay to sent digital signal, metadata cache and time delay insert module 22 include time delay and insert submodule, time delay is inserted submodule and is received data-signal and work clock, and data increase or minimizing time delay to receiving, promptly the data that receive are carried out instantaneous (0 to 50 millisecond) or the time delay increase or the minimizing of (50 milliseconds to 1 second) in short-term, will increase or reduce the out-of-date data-signal of delaying then and mail to alarm and error code insert module 23.Alarm and error code insert module 23 are used for alarming insertion with error code to sent digital signal, alarm and error code insert module 23 comprise error code insertion submodule and alarm insertion submodule, and error code inserts submodule and is used for inserting start time, error code insertion magnitude (10 by predefined error code
-2, 10
-3, 10
-4, 10
-5, 10
-6, 10
-7) and the time span of at every turn inserting error code carry out error code and insert; Alarm is inserted submodule according to the start time of each insertion, each kind and each time span of inserting alarm of inserting alarm, alarm insertion, promptly according to data-signal and work clock, on the data that receive, increase alarm, promptly use a kind of in LOS alarm, ais alarm, LOF alarm, the alarm of CRC-4 Loss Of Multiframe to alarm to replace the data that receive, this module can be carried out (greater than 1 second), the alarm insertion of (50 milliseconds to 1 second) or instantaneous (less than 50 milliseconds) in short-term for a long time.Output interface module 24 is used for the digital signal to be sent after described metadata cache and time delay insert module and/or described alarm and the processing of error code insert module is exported to by its destination address the protective relaying device of this destination address correspondence.
The pick-up unit of relay protection digital channel of the present invention carries out the setting of time delay to received data-signal; perhaps insert error code and alarm; time delay, number of bit errors by intentional manufacturing reach alarm etc. according to this; judge the processing power of protective relaying device, detect protective relaying device according to this and whether reach designing requirement etc. these time delays, error code or alarm.The set-up mode of time delay of the present invention, error code and alarm is flexible, has guaranteed that the measuring ability of pick-up unit of relay protection digital channel is complete, accuracy is high, speed piece, cost be low.
Fig. 3 is the process flow diagram of detection method of the relay protection digital channel of the embodiment of the invention, and as shown in Figure 3, the detection method of the relay protection digital channel of the embodiment of the invention may further comprise the steps:
Step 301: in detecting data, insert at least a in time delay, alarm data and the error code data, and described detection data are sent to protective relaying device.
Wherein, inserting time delay promptly inserts timetable by the time delay of setting and inserts instantaneous in mailing to the detection data of described protective relaying device or time delay in short-term.Time delay is inserted timetable and is preestablished, promptly set according to the requirement of desiring data detection signal, the duration that time delay is inserted timetable is spaced apart 0 to 50 millisecond instantaneous or 50 milliseconds to 1 second in short-term, the 50 milliseconds of time delays of inserting 20 milliseconds in detecting data in for example every interval, 5 minutes duration etc.According to predefined programmed sequence, to detecting data increase or minimizing time delay at regular time and quantity.Inserting alarm data is about to loss of signal alarm, complete " 1 " alarm, LOF alarm, the alarm of cyclic redundancy check (CRC) Loss Of Multiframe and is inserted in the described detection data by the alarm insertion timetable of setting.Promptly in detecting data, increase alarm, promptly use a kind of alarm in LOS alarm, ais alarm, LOF alarm, the alarm of CRC-4 Loss Of Multiframe to insert, this can carry out (greater than 1 second), the alarm of (50 milliseconds to 1 second) or instantaneous (less than 50 milliseconds) in short-term for a long time and insert, just (promptly set and when begin to insert alarm according to the value of setting in advance, each alarm of inserting what kind is inserted alarm how long at every turn) alarm insertion.Insert error code and be about to the error code that error code is inserted in the described detection data by the error code insertion timetable of setting or inserts the setting magnitude in described detection data, promptly insert various bit-error sequence at regular time and quantity to detecting data, perhaps, insert start time, error code insertion magnitude (10 according to predefined error code
-2, 10
-3, 10
-4, 10
-5, 10
-6, 10
-7), insert the time span of error code at every turn, carry out error code and insert.Time delay, alarm and error code insert the order that detects data and do not limit, if but time delay is inserted in the back generation, can not be inserted into alarm data and error code data; Alarm data and error code data can not be inserted mutually.
Detecting data is to meet the Bureau of Standards of the international telecommunication union telecommunication G.703 64kbit/s or the 2048kbit/s digital signal of standard, or for meeting G.703 and the G.704 framing digital signal of the 2048kbit/s of standard of the Bureau of Standards of international telecommunication union telecommunication.
Step 302: the detection data to the described protective relaying device that receives are alarmed and Error detection, and the output testing result.
Detection data after step 301 processing are sent to protective relaying device to be detected.Protective relaying device is handled by self setting program the detection data that receive, returns after disposing again; After receiving return data signal, pass through amplification, equilibrium, signal decoding and Clock Extraction, and the back data of decoding are alarmed and Error detection.For the alarm detection submodule, if digital signal is to meet the G.703 2048kbit/s digital signal of standard of ITU-T, then detection signal is lost (LOS) and complete " 1 " (AIS) alarms, if digital signal is to meet G.703 and the G.704 2048kbit/s digital signal of standard of ITU-T, then detect the LOS alarm, ais alarm and LOF (LOF) alarm, if digital signal is to meet G.703 and the G.704 2048kbit/s digital signal of standard of ITU-T, and band cyclic redundancy check (CRC) (CRC-4), then detect the LOS alarm, ais alarm, the LOF alarm, the alarm of CRC-4 Loss Of Multiframe, if digital signal is to meet the G.703 64kbit/s digital signal of standard of ITU-T, detect the LOS alarm.If digital signal is to meet the G.703 2048kbit/s digital signal of standard of ITU-T, then detect coding (Code) error code, if digital signal is to meet G.703 and the G.704 2048kbit/s framing digital signal of standard of ITU-T, and band CRC-4, then detect Code error code and CRC-4 piece error code, if digital signal is to meet the G.703 64kbit/s digital signal of standard of ITU-T, then detect coding (Code) error code.According to testing result, judge whether time delay, alarm and the error code processing of protective relaying device to be detected adheres to specification.
The detection method of relay protection digital channel of the present invention is carried out the setting of time delay to received data-signal; perhaps insert error code and alarm; delay data, error code and alarm etc. by intentional manufacturing; judge the processing power of protective relaying device, detect protective relaying device according to this and whether reach designing requirement etc. these error codes or alarm.The set-up mode of time delay of the present invention, error code and alarm is flexible, has guaranteed that the measuring ability of pick-up unit of relay protection digital channel is complete, accuracy is high, speed piece, cost be low.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (9)
1, a kind of pick-up unit of relay protection digital channel, comprise input interface module, alarm and error code detection module, output interface module, it is characterized in that, described pick-up unit also comprises at least one in metadata cache and time delay insert module, alarm and the error code insert module, wherein, described input interface module is used to receive the digital signal to be detected that protective relaying device sends; Described alarm and error code detection module are used for described digital signal to be detected is alarmed detection with error code; Described metadata cache and time delay insert module are used for carrying out buffer memory and inserting time delay to sent digital signal; Described alarm and error code insert module are used for alarming insertion with error code to sent digital signal; Described output interface module is used for the digital signal to be sent after described metadata cache and time delay insert module and/or described alarm and the processing of error code insert module is exported to by its destination address the protective relaying device of this destination address correspondence.
2, device according to claim 1, it is characterized in that, described alarm and error code detection module comprise alarm detection submodule and Error detection submodule, wherein, described alarm detection submodule is used to detect the loss of signal alarm of digital signal, complete " 1 " alarm, LOF alarm, the alarm of cyclic redundancy check (CRC) Loss Of Multiframe; Described Error detection submodule is used to detect the coding error code and the CRC-4 piece error code of digital signal.
3, device according to claim 1, it is characterized in that, described metadata cache and time delay insert module comprise time delay insertion submodule, described time delay is inserted submodule and is used for digital signal is increased or the minimizing time delay, and described time delay comprises 0 to 50 millisecond instantaneous time delay and 50 milliseconds to 1 second time delay in short-term.
4, device according to claim 1, it is characterized in that, described alarm and error code insert module comprise that error code inserts submodule and submodule is inserted in alarm, and described error code inserts submodule and is used for inserting time span that start time, error code insert magnitude and insert error code at every turn by predefined error code and carries out error code and insert; Described alarm is inserted submodule according to the start time of each insertion, each kind and each time span of inserting alarm of inserting alarm, alarms insertion.
5, device according to claim 4 is characterized in that, time span that submodule inserts alarm is at every turn inserted in described alarm when being 0 to 50 millisecond instantaneous, 50 milliseconds to 1 second long in short-term or more than 1 second; Described error code inserts time span that submodule inserts error code at every turn when being 0 to 50 millisecond instantaneous, 50 milliseconds to 1 second long in short-term or more than 1 second; Described error code inserts magnitude and comprises 10
-2, 10
-3, 10
-4, 10
-5, 10
-6And 10
-7
6, according to each described pick-up unit in the claim 1 to 5, it is characterized in that, described digital signal is to meet the Bureau of Standards of the international telecommunication union telecommunication G.703 64kbit/s of standard or the digital signal of 2048kbit/s, or for meeting G.703 and the G.704 framing digital signal of the 2048kbit/s of standard of the Bureau of Standards of international telecommunication union telecommunication.
7, a kind of detection method of relay protection digital channel is characterized in that, comprising:
In detecting data, insert at least a in time delay, alarm data and the error code data, and described detection data are sent to protective relaying device; Wherein, inserting time delay promptly inserts timetable by the time delay of setting and inserts instantaneous in mailing to the detection data of described protective relaying device or time delay in short-term; Insert alarm data and be about to loss of signal alarm, complete " 1 " alarm, LOF alarm, the alarm of cyclic redundancy check (CRC) Loss Of Multiframe and insert timetable by the alarm of setting and be inserted in the described detection data, insert the error code data and be about to error code and insert the error code that timetable is inserted in the described detection data or inserts the setting magnitude in described detection data by the error code of setting; And
The detection data that the described protective relaying device that receives is exported are alarmed and Error detection the output testing result.
8, method according to claim 7 is characterized in that, the duration that described time delay is inserted timetable is spaced apart 0 to 50 millisecond instantaneous or 50 milliseconds to 1 second in short-term; When described alarm and error code insert the timetable duration and are spaced apart 0 to 50 millisecond instantaneous, 50 milliseconds to 1 second long in short-term or more than 1 second; Described error code magnitude comprises 10
-2, 10
-3, 10
-4, 10
-5, 10
-6And 10
-7
9, according to claim 7 or 8 described methods, it is characterized in that, described detection data are to meet the Bureau of Standards of the international telecommunication union telecommunication G.703 64kbit/s or the 2048kbit/s digital signal of standard, or for meeting G.703 and the G.704 digital signal of the 2048kbit/s of standard of the Bureau of Standards of international telecommunication union telecommunication.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100784198A CN101504435A (en) | 2009-02-20 | 2009-02-20 | Detection apparatus and method for relay protection digital channel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100784198A CN101504435A (en) | 2009-02-20 | 2009-02-20 | Detection apparatus and method for relay protection digital channel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930069A (en) * | 2011-12-28 | 2013-02-13 | 许继集团有限公司 | Transmission channel simulation method and system for relay protection |
| CN103558466A (en) * | 2013-10-29 | 2014-02-05 | 国家电网公司 | Method for on-line whole group logic calibration of 10kV protecting device |
| CN104280632A (en) * | 2014-09-28 | 2015-01-14 | 国家电网公司 | Automatic detecting and early warning method for relay protection device and fault recorder |
| CN104579821A (en) * | 2014-12-04 | 2015-04-29 | 中国人民解放军91655部队 | Method and device for detecting frame structure form of data frame of E1 link |
-
2009
- 2009-02-20 CN CNA2009100784198A patent/CN101504435A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930069A (en) * | 2011-12-28 | 2013-02-13 | 许继集团有限公司 | Transmission channel simulation method and system for relay protection |
| CN102930069B (en) * | 2011-12-28 | 2016-04-13 | 许继电气股份有限公司 | A kind of transmission channel emulation mode for relay protection and system |
| CN103558466A (en) * | 2013-10-29 | 2014-02-05 | 国家电网公司 | Method for on-line whole group logic calibration of 10kV protecting device |
| CN104280632A (en) * | 2014-09-28 | 2015-01-14 | 国家电网公司 | Automatic detecting and early warning method for relay protection device and fault recorder |
| CN104280632B (en) * | 2014-09-28 | 2017-01-11 | 国家电网公司 | Automatic detecting and early warning method for relay protection device and fault recorder |
| CN104579821A (en) * | 2014-12-04 | 2015-04-29 | 中国人民解放军91655部队 | Method and device for detecting frame structure form of data frame of E1 link |
| CN104579821B (en) * | 2014-12-04 | 2018-07-31 | 中国人民解放军91655部队 | The method and apparatus for detecting the frame structure form of the data frame of E1 links |
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