CN108931696B - B-code clock abnormity detection method of intelligent substation and relay protection device - Google Patents
B-code clock abnormity detection method of intelligent substation and relay protection device Download PDFInfo
- Publication number
- CN108931696B CN108931696B CN201710380939.9A CN201710380939A CN108931696B CN 108931696 B CN108931696 B CN 108931696B CN 201710380939 A CN201710380939 A CN 201710380939A CN 108931696 B CN108931696 B CN 108931696B
- Authority
- CN
- China
- Prior art keywords
- time
- code clock
- clock signal
- detection
- code
- 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.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 89
- 230000002159 abnormal effect Effects 0.000 claims abstract description 38
- 238000012790 confirmation Methods 0.000 claims description 18
- 230000001360 synchronised effect Effects 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000009191 jumping Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention provides a B-code clock abnormity detection method and a relay protection device of an intelligent substation, wherein the relay protection device comprises a B-code clock abnormity detection module, a time difference comparison module and a time synchronization module, wherein the time difference comparison module is used for comparing time difference of a time range set before and after a time synchronization signal, if the time difference is smaller than a first set value, message jump detection is carried out, and after the detection is passed, the B-code clock signal is judged to be normal; if the time hopping is larger than the first set value, the time hopping is judged, whether the time synchronization signal pulse disappears is detected, if the time synchronization signal pulse disappears, the time for re-accessing the signal needs to be compared with the time of the relay protection device, if the time hopping is smaller than a set second set value, the message hopping detection is carried out, and after the detection is passed, the B code clock signal is judged to be normal. The invention detects whether the time jump of the B code clock signal is abnormal or not, thereby ensuring that the relay protection device carries out time synchronization with the GPS time service device under the condition that the B code clock is normal and improving the reliability of the time synchronization result.
Description
Technical Field
The invention belongs to the technical field of automation of power system substations, and particularly relates to a B-code clock abnormity detection method and a relay protection device for an intelligent substation.
Background
With the continuous growth of the scale of the power grid in China, the development of the power grid in China at present enters a new stage of cross-regional, extra-high voltage and alternating-current/direct-current hybrid operation, and the operation management of the power grid becomes more complex. In order to ensure the quality of power supply and the reliability and economy of a power system, a power grid dispatching center must accurately master the operation condition of the whole system in real time, analyze and make correct judgment and decision in time, and take emergency measures to deal with emergency accidents and abnormal conditions if necessary so as to ensure the safe, reliable and effective supply of power. In many fields of power systems, such as time sequence recording, relay protection, fault location, electric energy charging, real-time information acquisition and the like, a uniform and high-precision time reference is required, and the accuracy and uniformity of time are very important in a power grid. The accurate and uniform time reference can ensure the sampling synchronism of the intelligent substation, so that the normal and reliable operation of the intelligent substation is ensured. Especially, under the condition of continuous faults in a short time, the action behaviors, fault reasons, fault types and fault occurrence and development processes of all microcomputer protection can be conveniently analyzed and researched by the unified time reference of the total station, which has important significance for accident analysis and guarantee of safe operation of a power system.
At present, a time synchronization system in an automatic system of a transformer substation is in an open-loop state, lacks feedback information, cannot acquire the working state of a transformer substation clock, cannot effectively manage the transformer substation clock, and is easy to cause invalid event sequence records caused by time synchronization errors, even cause running accidents such as equipment crash and the like.
In a currently running or under-construction substation, relay protection B code synchronization plays an important role in intelligent substation clock management, the B code synchronization is widely applied by the three advantages of simple synchronization link, high precision, simplicity in implementation and the like, and a B code pulse signal is a continuous pulse signal once per second, so that the relay protection device is required to be capable of correctly capturing the B code pulse signal once in 1 second. A paper entitled "research on relay protection B code time synchronization in clock management system" at No. 18 of volume 51 of electric measurement and instrumentation in China journal discloses a set of schemes for comprehensively testing the time synchronization of the B code of a relay protection device, and the scheme utilizes the pulse of the B code to realize the code time synchronization of the relay protection device, detects check code bits, time quality and time information of a B code signal, judges whether the B code signal is abnormal, but does not detect whether the time jump of the B code signal is abnormal, so that the reliability of the time synchronization result of the relay protection device and a reference clock is low.
Disclosure of Invention
The invention aims to provide a B code clock abnormity detection method and a relay protection device of an intelligent substation, and aims to solve the problem that the reliability of a time setting result is low when a time setting device is set by using B code pulses in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a B-code clock abnormity detection method of an intelligent substation carries out time jump detection on a B-code clock signal, and the detection steps are as follows:
comparing time difference of time ranges set before and after the time synchronization signal, if the time difference is smaller than a first set value, carrying out message jump confirmation detection, and judging that the B code clock signal is normal after the detection is passed, otherwise, judging that the B code clock signal is abnormal;
if the time difference is larger than a first set value, judging the time jump to detect whether the time synchronization signal pulse disappears, if the time synchronization signal pulse disappears and then accesses again, comparing the time of signal re-access with the time of the relay protection device, if the time difference after comparison is smaller than a second set value, performing message jump confirmation detection, and if the time difference after detection is passed, judging that the B code clock signal is normal, otherwise, judging that the B code clock signal is abnormal.
Further, if the time synchronization signal pulse does not disappear, manual intervention is carried out, and if the time signal is recovered to be normal after the manual intervention, the relay protection device is synchronized with the B code clock signal; otherwise, the relay protection device is asynchronous with the B code clock signal.
Furthermore, before the time jump detection is performed on the B-code clock signal, whether the check bit of the B-code clock signal is correct or not needs to be detected, and if the check bit is not detected correctly, it is determined that the B-code clock signal is in an abnormal state, and the time jump detection is not performed any more.
Further, before performing time jump detection on the B-code clock signal, the time quality of the B-code clock signal needs to be detected, and if the time quality is greater than a set maximum allowable quality value, it is determined that the B-code clock signal is in an abnormal state, and time jump detection is not performed any more.
Further, before detecting the time jump of the B-code clock signal, it is necessary to detect whether the month-day transition of the B-code clock signal is correct, and if there is a transition error, it is determined that the B-code clock signal is in an abnormal state, and the time jump detection is not performed any more.
The invention also provides a relay protection device, wherein the relay protection device is provided with a B code clock abnormity detection module, the B code clock abnormity detection module carries out time jump detection on the B code clock signal, compares time difference between a time range set before and after a time synchronization signal, if the time difference is smaller than a first set value, carries out message jump confirmation detection, judges that the B code clock signal is normal after the detection is passed, and otherwise judges that the B code clock signal is abnormal;
if the time difference is larger than a first set value, judging the time jump to detect whether the time synchronization signal pulse disappears, if the time synchronization signal pulse disappears and then accesses, comparing the time for re-accessing the signal with the time of the relay protection device, if the time difference after comparison is smaller than a second set value, performing message jump confirmation detection, and if the time difference after detection is passed, judging that the B code clock signal is normal, otherwise, judging that the B code clock signal is abnormal.
Further, if the time synchronization signal pulse does not disappear, manual intervention is carried out, and if the time signal is recovered to be normal after the manual intervention, the relay protection device is synchronized with the B code clock signal; otherwise, the relay protection device is asynchronous with the B code clock signal.
Furthermore, before the time jump detection is performed on the B-code clock signal, whether the check bit of the B-code clock signal is correct or not needs to be detected, and if the check bit is not detected correctly, it is determined that the B-code clock signal is in an abnormal state, and the time jump detection is not performed any more.
Further, before performing time jump detection on the B-code clock signal, the time quality of the B-code clock signal needs to be detected, and if the time quality is greater than a set maximum allowable quality value, it is determined that the B-code clock signal is in an abnormal state, and time jump detection is not performed any more.
And further, detecting the clock error of the relay protection device, calculating the clock error by recording the time scale of the request for leaving/responding to the station control layer comprehensive management unit and the time scale of the request for leaving/responding to the relay protection device, and judging whether the time scale of each relay protection device is correct.
The invention has the beneficial effects that:
the invention provides a method for detecting the abnormal state of a B code clock, which is characterized in that a B code clock abnormal detection module is additionally arranged in a relay protection device, time difference comparison is carried out on a time range set before and after a time synchronization signal, if the time difference is smaller than a first set value, message jumping confirmation detection is carried out, after the detection is passed, the B code clock signal is judged to be normal, otherwise, the B code clock signal is judged to be abnormal; if the time difference is larger than a first set value, judging the time jump, detecting whether the time synchronization signal pulse disappears, if the time synchronization signal pulse disappears, then re-accessing, comparing the time of signal re-accessing with the time of the relay protection device, if the time difference after comparison is smaller than a second set value, then carrying out message jump confirmation detection, and after the detection is passed, judging that the B code clock signal is normal, otherwise, judging that the B code clock signal is abnormal. According to the method, the GPS clock and the time-synchronized equipment (the relay protection device) form a closed-loop monitoring system, the transformer substation clock can be effectively managed, time sequence recording invalidity caused by time synchronization errors is reduced, faults such as equipment crash and the like are avoided, and the reliability of time synchronization results is improved compared with the case that time jumping is not detected when the relay protection device is synchronized with the GPS time service device under the condition that the B code clock is normal.
Drawings
Fig. 1 is a system architecture diagram of a B-code clock anomaly detection method suitable for an intelligent substation;
fig. 2 is a flow chart of B-code clock message checking software.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
the embodiment of the B-code clock abnormity detection method of the intelligent substation comprises the following steps:
in order to adapt to the development of an intelligent substation, a set of clock synchronization system, namely a time synchronization management technical scheme, is provided, and the scheme forms closed-loop monitoring on a clock and time-synchronized equipment so that substation operators can effectively master the time operation system of the whole substation.
A B code clock abnormity detection system of an intelligent substation is disclosed, as shown in figure 1, a comprehensive management unit of a substation inner control layer, a monitoring management system, a spacer layer relay protection device, a process layer combination unit and a satellite time service device of an intelligent terminal output time synchronization signal are arranged in the system, the device receives a GPS satellite as an external time reference signal, the spacer layer relay protection device can correctly update time and set a synchronization mark when receiving the GPS time synchronization signal, the relay protection obtains continuous B code time synchronization signals, and after the information of the B code pulse signal is judged to be correct by a built-in B code clock abnormity detection module, the related time information of the B code pulse is extracted and the relay protection device is subjected to time synchronization so as to realize the function of synchronizing with the GPS clock.
Because the B code pulse signal is a continuous pulse signal once per second, the relay protection device is required to be capable of correctly capturing the B code pulse signal once every 1 second and carrying out related analysis processing in time, so that certain performance requirements are provided for the logic operation processing capacity of B code clock abnormality detection software in the relay protection device.
Judging the time continuity (jump detection) of the relay protection device, namely refreshing at local second intervals, comparing the annual, monthly, daily, hour, minute and second of local time with the received annual, monthly, daily, hour, minute and second, and if the local time is logically the same, judging that the time is continuous, otherwise, judging that the time is discontinuous; the relay protection device has the capability of detecting the discontinuous input time, can be kept time when the discontinuous input time appears, and sends out a continuous time abnormal alarm; the relay protection device can correctly process leap second time, so that an error time discontinuous state is avoided; the relay protection device should be able to correctly process the quality and check bits in the time message and react in the self-checking information.
The clock abnormity detection module of the relay protection device executes the logic operation of B code message abnormity detection, including time tick abnormity, time tick jump detection abnormity and time tick update.
Wherein, the condition of detecting the time tick anomaly comprises: : 1) when receiving and analyzing a B-code message, adding a B-code message counter, caching the message, and setting a time tick signal abnormal state when detecting that the message counter does not change for a long time; 2) when the time quality of the code B is greater than B, the time is not updated, a time quality standard exceeding counter is added, and a time setting signal abnormal state is set; 3) when the parity check of the B code is wrong, the time is not updated, a parity check bit error counter is added, and the abnormal state of the time tick signal is set; 4) when the time setting signal abnormal state occurs, the time setting service is abnormal.
The case of detecting the abnormal time transition detection includes: 1) b code jump detection is only carried out under the condition that parity check bits of a B code message are received and no abnormity occurs in the day and the month; 2) except that the device is powered on for the first time and does not detect the time hopping of the B code, the other devices detect the time hopping; 3) local time for detecting a jump: the local time for jump detection is taken as the local time of the device; 4) detecting the message time for jumping: the message time for jump detection is equal to the message receiving time +1 s; 5) the jump detection method comprises the following steps: after receiving the effective B code time synchronization message, if the local time for jump detection is different from the time of the jump detection message, time jump occurs; 6) and when time hopping occurs under the condition that the time synchronization service is normal, setting a time hopping state, and clearing the state when the time is updated. When the time jump state is from absent to present, increasing a time jump counter; 7) when the time jump occurs, the time is not updated except for recovery and manual intervention after the pulse disappears.
The case of detecting the time update of the B code comprises the following steps: 1) the time tick message confirmation needs to be carried out twice before the time of updating the device by all the B codes, and the time of the device is allowed to be updated only when the time intervals of the time tick messages of two continuous frames are logically continuous; 2) the interval of the time synchronization messages is logically continuous, namely that: setting a leap second advance notice (LSP) of the last received message, wherein the negative leap second interval corresponding to the reset of the leap second advance notice (LSP) of the current received message is 2 seconds, the positive leap second interval is not 0 second, and the interval time of the rest messages is 1 second; 3) when parity check dislocation, time quality exceeding standard and sun and moon abnormity occur in the time tick messages, time is not updated; 4) under the condition of meeting the updating time condition, the time is updated only under the following three conditions that A) when the time tick message has no jump, B) the pulse disappears to the recovery process, and the time difference is smaller than a set threshold value C) manual intervention; 5) and when the device time is updated, clearing the pulse disappearance marks and the time jump state.
Clock error is a very important concept in GPS positioning systems, and is directly related to the accuracy of GPS positioning systems. The comprehensive management unit realizes the clock error measurement of the device based on the NTP time synchronization protocol, and the algorithm is as follows: (T2 +. DELTA.t) -T1 ═ T4- (T3 +. DELTA.t), ([ (T4-T3) + (T1-T2) ]/2, where T1 is a time scale for the measurement request to leave the integrated management unit, T2 is a time scale for the measurement request to reach the protection device, T3 is a time scale for the measurement request to leave the protection device, T4 is a time scale for the measurement request to reach the integrated management unit, and Δ T is a clock difference, and the clock difference Δ T is calculated by the recording device time scale for determining the accuracy of the system pair each. According to the method, a clock equipment comprehensive management unit and a time-synchronized equipment relay protection device form a closed-loop detection system, so that the time-synchronizing state can be detected, and a detection result can be uploaded to a substation monitoring management unit.
Referring to fig. 2, the specific process of the protection device for checking the B-code clock abnormal signal is as follows:
firstly, the device carries out modulation and decoding on an accessed B code signal by a time synchronization module according to a standard code element format, analyzes time information and corresponding flag bits contained in 100 code elements per second in real time, and records the analyzed original time messages. Check code bits, time quality bits and time information in the message are all important points of interest for checking.
The check code is the result of odd check from 'second bit' to 'time quality' bit per second code element, whether the actual check code is consistent with the theoretical calculation or not is checked, and whether the signal has error code elements or not can be totally judged.
The time quality bit represents whether the working state of the main clock of the current B code signal source is normal or not, the range of the accuracy difference between the time of the current signal and the standard time is wide, and the higher the time accuracy is, the more accurate the time is. The time quality is set to 0x0-0xB, 0xF 13 grades according to the standard format, and each grade represents different time accuracy. Under the normal working state of the clock, the time quality of the output B code signal is 0x0, and under the abnormal state, the time quality is set according to the self signal accuracy.
The time information includes the current hour, minute and second, year and day, and the special point is that the month and day information is converted according to the number of days, and the symbol does not directly represent months and days in the signal. For example: if the analyzed number of days is 61 days, the year is 2017, and the current time represents the time information of 3 months and 2 days in 2017. Meanwhile, the time information represented by the signal should be coherent, a jump condition cannot exist, the turning and carry moments also need to be carried out according to the standard requirement, and leap second processing also needs to be carried out according to the standard.
The main contents of the time check are as follows:
checking whether the check bit is correct;
whether the time quality meets the operation requirement or not;
whether the moon-sun conversion is correct or not;
fourthly, whether the time information has jump or not, whether the time information is continuous or not and whether the carry overturning is correct or not.
The checking is carried out in a serial mode, and the check bits, the time quality bits, the month-day conversion and the time jump state are checked in sequence. The module initializes a check error counter, a time quality error counter, a message error counter, and a time jump counter. After the check is started, the recorded original time message is detected, check bit correct check is firstly carried out, if check errors exist, a check error counter is added with 1, meanwhile, a time signal error state is set, and the module is not synchronous along with the time signal.
If the time quality exceeds the set maximum allowable quality value, adding 1 to a time quality error counter, and simultaneously setting a time signal error state, wherein the module is not synchronous with the time signal;
carrying out month-day conversion calculation check under the condition that the time quality meets the requirement of a set value, checking whether the month-day conversion is correct, if a conversion error exists, adding 1 to a message error counter, and simultaneously setting a time signal error state, wherein the module is not synchronous along with the time signal;
and after the moon-sun conversion check is correct, checking whether the time is the first time of updating after the module is powered on, namely whether the time synchronization signal is received for the first time after the module is powered on. If the time synchronization signal is in the first time, the 3s message jump confirmation check is carried out again, if the time synchronization signal in the 3s is correct and has no jump, the module is synchronized with the time signal, otherwise, the time signal error state is set, and the module is not synchronized with the time signal. If the time synchronization signal is received for the first time without module power-on, performing time jump check; the message jump check is to check the quality of the B-code clock, and according to the standard requirement of the B-code pulse, 1 s-one B-code pulse train is required, so that validity judgment is performed on two adjacent B codes, namely time difference comparison is performed on 2s before and after a time synchronization signal, and once the time difference between the two adjacent B-code signals is greater than 1s, the quality of the B-code signal is problematic, and a clock system needs to be overhauled. In order to prevent the false discrimination, the error of the internal recognition of the current device is 1s +/-500 us; and if the time difference is less than 1s, carrying out 3s message jump confirmation check, and if the check is passed, following the time signal synchronization by the module, and if the check is not passed, not following the synchronization.
And (3) continuing to check the disappearance of the pulse signal under the condition that the time signal jumps, if the time synchronization signal pulse is not interrupted and disappears, setting the time signal jump state, adding 1 to a time jump counter, and performing manual intervention on the time signal jump state to reset the module or inspect and repair the time synchronization signal, wherein the manual intervention is mainly a processing means after the time is abnormal, so that the time jump is prevented from causing unknown influence on the whole system. Once the time jump occurs, the clock system needs to be overhauled, and after the clock returns to normal, the clock system must be manually confirmed and then resynchronized to prevent the device from being mistakenly identified. Because the embedded operating system is used in the device, each task has success or failure during execution, and therefore, each path needs to be considered in the implementation logic of manual intervention operation, so that the failure condition needs to be considered for resetting, and program abnormity is prevented.
If the manual intervention fails or the manual intervention is not carried out, the time signal error state is set, the module is not synchronized along with the time signal, 3s message jumping confirmation is carried out if the manual intervention succeeds, the synchronization is carried out if the manual intervention succeeds, and the time signal synchronization is not carried out if the manual intervention succeeds. If the time synchronization signal pulse disappears and then is accessed, the signal time needs to be compared with the time of a clock of the relay protection device, if the time difference is smaller than a threshold value of 3600s, 3s message jump confirmation is carried out, the time signal synchronization is automatically followed if the time difference is successful, the time signal error state is set if the time signal error state is unsuccessful, and the module does not follow the synchronization; if the time difference is larger than the threshold value of 3600s, manual intervention check is carried out, intervention successfully enters 3s message jump confirmation check, if the intervention check is unsuccessful, a time signal error state is set, and the module is not synchronized along with the signal. The time difference is set to 3600s according to field operation experience and device fault tolerance after synthesis, and the purpose is to ensure that a clock has small deviation and does not falsely report as far as possible under the condition that the function of the device is not influenced.
The invention also provides a relay protection device, wherein the relay protection device is provided with a B code clock abnormity detection module, the B code clock abnormity detection module carries out time jump detection on the B code clock signal, compares time difference between a time range set before and after a time synchronization signal, if the time difference is less than a first set value, carries out message jump confirmation detection, judges that the B code clock signal is normal after the detection is passed, otherwise judges that the B code clock signal is abnormal; if the time difference is larger than a first set value, judging the time jump to detect whether the time synchronization signal pulse disappears, if the time synchronization signal pulse disappears and then accesses, comparing the time for re-accessing the signal with the time of the relay protection device, if the time difference after comparison is smaller than a second set value, performing message jump confirmation detection, and if the detection is passed, judging that the B code clock signal is normal, otherwise, judging that the B code clock signal is abnormal. The invention ensures that the relay protection device can improve the reliability of the time synchronization result compared with the method that the time jump of the B code clock signal is not detected when the B code clock signal is normally synchronized with the GPS time service device.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (10)
1. A B-code clock abnormity detection method of an intelligent substation is characterized in that time jump detection is carried out on a B-code clock signal, and the detection steps are as follows:
comparing the time difference of two adjacent B code signals in a time range set before and after the time synchronization signal, if the time difference of the two adjacent B code signals is smaller than a first set value, carrying out message jump confirmation detection, and judging that the B code clock signal is normal after the detection is passed, otherwise, judging that the B code clock signal is abnormal;
if the time difference between the two adjacent B code signals is greater than a first set value, judging the time jump to detect whether the time synchronization signal pulse disappears, if the time synchronization signal pulse disappears and then accesses again, comparing the time of signal re-access with the time of the relay protection device, if the time difference between the time of signal re-access and the time of the relay protection device after comparison is less than a second set value, carrying out message jump confirmation detection, and judging that the B code clock signal is normal after the detection is passed, otherwise, judging that the B code clock signal is abnormal.
2. The B-code clock abnormity detection method of the intelligent substation according to claim 1, wherein if the time synchronization signal pulse does not disappear, manual intervention is performed, and if the time signal returns to normal after the manual intervention, the relay protection device is synchronized with the B-code clock signal; otherwise, the relay protection device is asynchronous with the B code clock signal.
3. The B-code clock anomaly detection method of the intelligent substation according to claim 1, wherein before the time jump detection is performed on the B-code clock signal, whether the check bit of the B-code clock signal is correct or not is also detected, and if the check bit is not detected correctly, the B-code clock signal is judged to be in an abnormal state, and the time jump detection is not performed any more.
4. The B-code clock anomaly detection method of the intelligent substation according to claim 1, characterized in that before time jump detection is performed on the B-code clock signal, the time quality of the B-code clock signal needs to be detected, and if the time quality is greater than a set maximum allowable quality value, it is determined that the B-code clock signal is in an abnormal state, and time jump detection is not performed any more.
5. The B-code clock anomaly detection method of the intelligent substation according to claim 1, wherein before the time jump detection is performed on the B-code clock signal, whether the lunar-solar conversion of the B-code clock signal is correct or not is also detected, and if the conversion error exists, the B-code clock signal is judged to be in an abnormal state, and the time jump detection is not performed any more.
6. A relay protection device is characterized in that a B code clock abnormity detection module is arranged on the relay protection device, the B code clock abnormity detection module carries out time jump detection on a B code clock signal, time difference of two adjacent B code signals is compared in a time range set before and after a time synchronization signal, if the time difference of the two adjacent B code signals is smaller than a first set value, message jump confirmation detection is carried out, after the detection is passed, the B code clock signal is judged to be normal, otherwise, the B code clock signal is judged to be abnormal;
if the time difference between the two adjacent B code signals is greater than a first set value, judging the time jump to detect whether the time synchronization signal pulse disappears, if the time synchronization signal pulse disappears and then accesses, comparing the time of signal re-access with the time of the relay protection device, if the time difference between the time of signal re-access and the time of the relay protection device is less than a second set value after comparison, carrying out message jump confirmation detection, and judging that the B code clock signal is normal after the detection is passed, otherwise, judging that the B code clock signal is abnormal.
7. The relay protection device according to claim 6, wherein if the time synchronization signal pulse does not disappear, manual intervention is performed, and if the time signal returns to normal after the manual intervention, the relay protection device is synchronized with the B-code clock signal; otherwise, the relay protection device is asynchronous with the B code clock signal.
8. The relay protection device according to claim 6, wherein before performing the time jump detection on the B-code clock signal, it is further required to detect whether the check bit of the B-code clock signal is correct, and if the check bit is not detected correctly, it is determined that the B-code clock signal is in an abnormal state, and the time jump detection is not performed any more.
9. The relay protection device according to claim 6, wherein before detecting the time jump of the B-code clock signal, the time quality of the B-code clock signal needs to be detected, and if the time quality is greater than a set maximum allowable quality value, it is determined that the B-code clock signal is in an abnormal state, and the time jump detection is not performed any more.
10. The relay protection device according to claim 6, further comprising detecting a clock difference of the relay protection device, calculating the clock difference by recording a time scale for requesting to leave/respond to the station control layer integrated management unit and a time scale for requesting to leave/respond to the relay protection device, and determining whether each relay protection device pair is correct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380939.9A CN108931696B (en) | 2017-05-25 | 2017-05-25 | B-code clock abnormity detection method of intelligent substation and relay protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380939.9A CN108931696B (en) | 2017-05-25 | 2017-05-25 | B-code clock abnormity detection method of intelligent substation and relay protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108931696A CN108931696A (en) | 2018-12-04 |
| CN108931696B true CN108931696B (en) | 2021-06-29 |
Family
ID=64450872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710380939.9A Active CN108931696B (en) | 2017-05-25 | 2017-05-25 | B-code clock abnormity detection method of intelligent substation and relay protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108931696B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114205066B (en) * | 2021-11-23 | 2023-10-24 | 青岛鼎信通讯股份有限公司 | Time synchronization detection method based on acquisition terminal B code time synchronization |
| CN114866626B (en) * | 2022-04-28 | 2023-09-29 | 国电南瑞科技股份有限公司 | Intelligent substation Ethernet message processing system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194970B1 (en) * | 1999-08-19 | 2001-02-27 | Nortel Networks Corporation | Oscillator stability monitoring and compensation system |
| CN101227205A (en) * | 2008-01-29 | 2008-07-23 | 中兴通讯股份有限公司 | Clock detection method for wireless communication system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3629373B2 (en) * | 1998-11-10 | 2005-03-16 | セイコーインスツル株式会社 | Clock with time difference correction mechanism |
| CN101841322A (en) * | 2009-03-20 | 2010-09-22 | 华为技术有限公司 | Method for detecting clock signal and device thereof |
| CN102075278B (en) * | 2010-12-22 | 2013-09-04 | 桂林电子科技大学 | Multi-path adaptive extensive-rate code rate justification device and method |
| CN102694616B (en) * | 2012-06-11 | 2014-11-26 | 福建星网锐捷网络有限公司 | Clock detection circuit, clock circuit and clock exception detection method |
-
2017
- 2017-05-25 CN CN201710380939.9A patent/CN108931696B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194970B1 (en) * | 1999-08-19 | 2001-02-27 | Nortel Networks Corporation | Oscillator stability monitoring and compensation system |
| CN101227205A (en) * | 2008-01-29 | 2008-07-23 | 中兴通讯股份有限公司 | Clock detection method for wireless communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108931696A (en) | 2018-12-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103368259B (en) | A kind of electric substation's measure and control device remote signalling measurement test system that utilizes is to the method for testing of time accuracy | |
| CN108333477B (en) | Photovoltaic access power distribution network fault positioning method and device based on synchronous timestamp | |
| CN111830342B (en) | Multi-system fusion intelligent substation relay protection dynamic fixed inspection method | |
| CN104579624A (en) | Clock synchronization method of network sampling intelligent substation | |
| CN106787169B (en) | Method for diagnosing telemetering fault of transformer substation by using multiple data source comparison technology | |
| CN105699789A (en) | Identification method of fault indicator installation phase sequence | |
| CN103823361A (en) | Multi-source dynamic self-adaptation clock synchronization method and device | |
| CN108931696B (en) | B-code clock abnormity detection method of intelligent substation and relay protection device | |
| CN106254022A (en) | Time supervision based on clock synchronization apparatus and time delay query software system platform | |
| CN111984059B (en) | PPS (polyphenylene sulfide) jump detection method and system for timing by time service module | |
| CN110988515A (en) | Voltage channel sampling abnormity detection method of transformer substation relay protection device | |
| CN103616653B (en) | System and method are tested with clock accuracy during a kind of electric energy quality monitoring terminal pair | |
| CN113489140B (en) | Time setting fault positioning method for transformer substation | |
| CN202340147U (en) | Remote signaling quantity testing system of measuring and control device of power substation | |
| CN111398675A (en) | Electric energy meter reading method, device and system | |
| CN105573110A (en) | Leap second detection system and method of GNSS time synchronization system | |
| CN115914014A (en) | Acceptance detection system, method, equipment and medium for substation unmanned aerial vehicle decoy equipment | |
| CN111680037B (en) | Dynamic data time scale acquisition method and device | |
| CN114114134A (en) | Time synchronization method of intelligent electric energy meter | |
| CN102946145B (en) | The determination methods of transformer station's time synchronous exception and system | |
| KR20150043788A (en) | Fault information output apparatus of transmission line | |
| CN114205066B (en) | Time synchronization detection method based on acquisition terminal B code time synchronization | |
| CN202221524U (en) | Fault detection and positioning device for time management unit of electric power measurement and control protective device | |
| CN113489599B (en) | Time synchronization verification system and time synchronization defect elimination method for transformer substation | |
| CN103368258A (en) | Method for testing telecommand deflection by telecommand quantity testing system of measuring and control device of substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |