CN107976612B - Polarity verification method based on single-phase earth fault line tripping information - Google Patents
Polarity verification method based on single-phase earth fault line tripping information Download PDFInfo
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- CN107976612B CN107976612B CN201810040098.1A CN201810040098A CN107976612B CN 107976612 B CN107976612 B CN 107976612B CN 201810040098 A CN201810040098 A CN 201810040098A CN 107976612 B CN107976612 B CN 107976612B
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention relates to a polarity checking method based on single-phase earth fault circuit tripping information, which carries out polarity checking judgment by calculating polarity coefficients between a tripping circuit and other circuits or power direction coefficients between the tripping circuit and zero-sequence voltage according to whether the single-phase earth fault is recovered after tripping. The invention can fully utilize the trip information and carry out polarity uniformity verification on the accessed line signals under the condition of no power failure, and is not influenced by a neutral point grounding mode.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a polarity verification method based on single-phase earth fault line tripping information.
Background
Single-phase earth faults in power distribution networks are one of the most frequent types of faults. After the single-phase earth fault, the system is allowed to continue to operate with the fault within 2 hours at most so as to improve the power supply reliability. However, the fault is easily expanded to a two-point or multi-point grounding short circuit after long-time operation, and the arc grounding can also cause the over-voltage of the whole system, further damages equipment and destroys the safe operation of the system, so that a fault line must be found and cut off in time. Normally, the single-phase earth fault line is searched by sequentially pulling the line under the command of a scheduling attendant. The pulling sequence is generally the line selection result reported by the low-current ground fault line selection device in the transformer substation. And if the fault does not disappear, switching on the trial pull line, and then trying to pull other lines according to the line sequence until the fault line is found.
The basic line selection method of the small current ground fault line selection device is to analyze and compare the relation between the zero sequence current of the monitored line and the zero sequence voltage of the bus to judge the fault line. In both the steady-state method and the transient-state method, the power direction is generally determined between the zero-sequence currents or between the zero-sequence currents and the zero-sequence voltages. Other methods such as an injection method or a neutral point switching resistor are all judged through the variation or the threshold value of the zero sequence current of the monitored line. No matter which method or principle is used, whether the polarities of the access signals are uniform or not is a key factor influencing the correct line selection of the low-current ground fault.
Disclosure of Invention
The invention provides a polarity check method based on single-phase earth fault line tripping information, which is used for carrying out polarity check by calculating a polarity coefficient between a tripping line and other lines or a power direction coefficient between the tripping line and zero-sequence voltage according to whether a fault is recovered after the single-phase earth fault line trips.
In order to achieve the above object, the present invention provides a polarity verification method based on single-phase ground fault line trip information, which performs polarity verification judgment by calculating a polarity coefficient between a trip line and other lines or a power direction coefficient between the trip line and zero-sequence voltage according to whether a fault is recovered after a single-phase ground fault trip, and comprises the following steps:
step one, supposing that m lines are shared by the monitored buses, and m is more than or equal to 2, when the ith line trips after a single-phase earth fault occurs, extracting zero-sequence current fault recording signals of all the m lines after a fault time point, judging whether the fault is recovered according to a zero-sequence voltage effective value, if the fault is recovered, executing a step two, and if the fault still exists, executing a step three;
calculating the polarity coefficient between the zero sequence current fault recording data of the trip circuit and the other m-1 lines and storing the polarity coefficient in a one-dimensional array F i In which F is i Representing a one-dimensional array formed by the tripping circuit after the ith trip and the polarity coefficient of each circuit;
step three, calculating the power directions of the trip circuit and the zero sequence voltage and storing the power directions in a one-dimensional array H i In which H i A one-dimensional array composed of power direction coefficients representing the ith line after n trips is set
If h is more than 0.8n, the polarity of the ith line is normal, if h is less than-0.8 n, the polarity of the ith line is wrong, and if other conditions exist, the polarity of the ith line is abnormal;
step four, all the polarity coefficients related to the kth line after the previous n trips are taken, if yes, all the polarity coefficients are obtained
The k line has correct polarity; if it is
The polarity of the k line is wrong; if it is
The polarity is abnormal.
The invention can be further embodied as follows:
one-dimensional array F in step two i =[f 1 ,f 2 ,…，f j ，…，f m ]In which F is i （j）=f j If the polarity of the trip line is opposite to that of the jth line, it is marked as f j If they are the same, f is represented as j = -1, if the jth line is a trip line, then it is denoted as f j =0。
The invention can be further embodied as follows:
and in the third step, a transient power direction calculation method is adopted for calculating the power directions of the trip circuit and the zero sequence voltage.
The beneficial effects of the invention are: the polarity verification method based on the single-phase earth fault line tripping information has the advantages that: according to whether the fault is recovered after the single-phase earth fault line trips, polarity verification is carried out through a polarity coefficient between the trip line and other lines or a power direction coefficient between the trip line and zero sequence voltage, polarity uniformity verification can be carried out on signals of the accessed line under the condition of no power outage by fully utilizing trip information, and the influence of a neutral point grounding mode is avoided.
Drawings
Fig. 1 is a logic flow diagram of a polarity verification method based on single-phase earth fault line trip information.
Detailed Description
In order to more clearly explain the advantages of the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description. In the following description, numerous specific examples are set forth to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as specifically described herein and is therefore not limited to the specific examples disclosed below.
In order to realize the purpose, the invention adopts the following technical scheme to realize the purpose:
as shown in fig. 1, a polarity check method based on single-phase ground fault line trip information, according to whether a fault is recovered after a single-phase ground fault is tripped, performs polarity check judgment by calculating a polarity coefficient between a trip line and another line or a power direction coefficient between the trip line and zero-sequence voltage, includes the following steps:
step one, supposing that m lines are shared by the monitored buses, and m is larger than or equal to 2, when the ith line trips after a single-phase earth fault occurs, extracting zero-sequence current fault recording signals of all the m lines after the fault occurs, judging whether the fault is recovered according to a zero-sequence voltage effective value, if the fault is recovered, executing step two, and if the fault still exists, executing step three.
Calculating the polarity coefficient between the zero sequence current fault recording data of the trip circuit and the other m-1 lines and storing the polarity coefficient in a one-dimensional array F i In which F is i One-dimensional array representing the polarity coefficient of the trip circuit and each circuit after the ith trip, and one-dimensional array F i =[f 1 ,f 2 ,…，f j ，…，f m ]In which F is i （j）=f j If the polarity of the trip line is opposite to that of the jth line, it is marked as f j =1, if identical, then mark as f j = -1, if j line is the trip line then f j =0。
Step three, calculating the power directions of the trip circuit and the zero sequence voltage and storing the power directions in a one-dimensional array H i In which H is i A one-dimensional array composed of power direction coefficients representing the ith line after n trips is set
If h is more than 0.8n, the polarity of the ith line is normal, if h is less than-0.8 n, the polarity of the ith line is wrong, and if other conditions exist, the polarity of the ith line is abnormal; and the power directions of the trip circuit and the zero sequence voltage are calculated by adopting a transient power direction calculation method.
Step four, all the polarity coefficients related to the kth line after the previous n trips are taken, if yes, all the polarity coefficients are obtained
The polarity of the kth line is correct; if it is
The k line has wrong polarity; if it is
The polarity is abnormal.
The above-described embodiments are merely preferred examples of the present invention and are not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent change, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A polarity check method based on single-phase earth fault circuit tripping information is characterized in that according to whether a fault is recovered after single-phase earth fault tripping or not, polarity check judgment is carried out by calculating a polarity coefficient between a tripping circuit and other circuits or a power direction coefficient between the tripping circuit and zero-sequence voltage, and the method comprises the following steps:
step one, supposing that m lines are shared by the monitored buses, and m is more than or equal to 2, when the kth line trips after a single-phase earth fault occurs, extracting zero-sequence current fault recording signals of all the m lines after the fault occurs, judging whether the fault is recovered according to a zero-sequence voltage effective value, if the fault is recovered, executing a step two, and if the fault still exists, executing a step three;
calculating the polarity coefficient between the zero sequence current fault recording data of the trip circuit and the other m-1 lines and storing the polarity coefficient in a one-dimensional array F n In (F) n One-dimensional array F composed of tripping circuit after nth trip and polarity coefficient of each circuit n =[f 1 ,f 2 ,…，f j ，…，f m ]In which F is n （j）=f j If the polarity of the trip line is opposite to that of the jth line, the circuit is marked as f j If they are the same, f is represented as j = -1, if the jth line is a trip line then it is recorded asf j =0；
Step three, calculating the power direction of the trip circuit and the zero sequence voltage and storing the power direction in a one-dimensional array H k In which H is k One-dimensional array composed of power direction coefficients representing the k line after n trips is set
If h is more than 0.8n, the polarity of the kth line is normal, if h is less than-0.8 n, the polarity of the kth line is wrong, and if other conditions exist, the polarity of the kth line is abnormal;
step four, taking all polarity coefficients related to the kth line after the previous n trips, if so, judging whether the current n trips are equal to the current n trips or not
The polarity of the kth line is correct; if it is
The polarity of the k line is wrong; if it is
The polarity is abnormal.
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| CN201810040098.1A CN107976612B (en) | 2018-01-16 | 2018-01-16 | Polarity verification method based on single-phase earth fault line tripping information |
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| CN111812452B (en) * | 2020-06-11 | 2023-02-21 | 国电南瑞科技股份有限公司 | CT polarity self-correction method and system for low-current grounding line selection device |
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| JP2006180402A (en) * | 2004-12-24 | 2006-07-06 | Nec Access Technica Ltd | Line polarity detection system and line polarity detection method |
| CN102508107A (en) * | 2011-12-02 | 2012-06-20 | 重庆大学 | Detection method of zero sequence current mutual inductor of small current system |
| CN103123389A (en) * | 2011-11-21 | 2013-05-29 | 甘肃省电力公司定西供电公司 | Method for verifying polarity of zero-sequence current transformer |
| CN104062543A (en) * | 2014-06-27 | 2014-09-24 | 中广核工程有限公司 | Zero sequence differential protection polarity verification method and zero sequence differential protection calibration method |
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| US10191102B2 (en) * | 2015-01-27 | 2019-01-29 | Utility Relay Company | Automatic current transformer polarity correction |
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|---|---|---|---|---|
| JP2006180402A (en) * | 2004-12-24 | 2006-07-06 | Nec Access Technica Ltd | Line polarity detection system and line polarity detection method |
| CN103123389A (en) * | 2011-11-21 | 2013-05-29 | 甘肃省电力公司定西供电公司 | Method for verifying polarity of zero-sequence current transformer |
| CN102508107A (en) * | 2011-12-02 | 2012-06-20 | 重庆大学 | Detection method of zero sequence current mutual inductor of small current system |
| CN104062543A (en) * | 2014-06-27 | 2014-09-24 | 中广核工程有限公司 | Zero sequence differential protection polarity verification method and zero sequence differential protection calibration method |
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| 小电流接地故障全信息量选线及自适应保护技术;张秋凤;《中国优秀硕士学位论文全文数据库》;20150815(第8期);第23-27页 * |
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