CN108683176B - Method for judging power failure of 10 kV line branch line - Google Patents
Method for judging power failure of 10 kV line branch line Download PDFInfo
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- CN108683176B CN108683176B CN201810360870.8A CN201810360870A CN108683176B CN 108683176 B CN108683176 B CN 108683176B CN 201810360870 A CN201810360870 A CN 201810360870A CN 108683176 B CN108683176 B CN 108683176B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
In order to solve the technical problems of time and labor consumption and low efficiency in the prior art in a mode of manually judging whether a power-cut public distribution transformer on a 10 kV line belongs to the same branch line, the invention provides a method for judging the power cut of the 10 kV line branch line by adopting a management system. The method comprises the following steps: s1: acquiring the number M of public distribution transformers with power failure on a 10 kilovolt line and the number N of all public distribution transformers on the line in a set period; s2: when M is more than or equal to 2, successively comparing other power failure common distribution transformers with the common distribution transformer with the earliest power failure time, and recording all power failure common distribution transformers with power failure and power restoration time differences within 5 minutes into an M1 group; repeating the judgment in the power failure common distribution transformation range except M1, and recording the corresponding eligible common distribution transformation into an Mn subgroup; s3: when the number of the common distribution transformers M1 and Mn of the M1 group and the Mn group is judged to be less than 50% of N, the branch line where M1 or Mn is located is judged to be powered off. Compared with the prior art, the invention improves the efficiency and saves the resources.
Description
Technical Field
The invention relates to the technical field of power grid analysis, in particular to a method for judging power failure of 10 kV line branch lines.
Background
With the continuous development of the company power grid monitoring informatization and automation technology, the existing dispatching automation and distribution network automation system realizes the function of monitoring the power grid operation in the important urban area, however, for suburbs, villages and towns and wide rural areas which cannot be covered by the distribution network automation, more power failure faults on a 10 kV line still need to be reported and repaired by a user, emergency repair personnel can be dispatched to carry out the treatment, and the common treatment mode is only the common distribution transformer aiming at the fault of the bottommost layer, namely, the public distribution transformer, is overhauled, and the public distribution transformer is distributed in different places, so that whether the power failure fault of the public distribution transformer is caused by the fault of the branch line where the public distribution transformer is positioned or not is difficult to find out by a field inspection mode, and the failure correlation and the most fundamental failure reason existing between single failure distribution transformers are difficult to find out due to the lack of effective monitoring analysis on the failure influence range and law. Therefore, even if the correlation between the fault distribution transformers is found by manually performing on-site investigation directly or manually performing data analysis, huge manpower and time are consumed due to wide distribution of the distribution transformers and huge grid data, and the efficiency is low. Therefore, it is urgently needed that a management system adopts an automatic method to analyze the relationship between the power failure fault distribution transformers, and finds whether the power failure fault distribution transformers belong to the same branch line on a 10 kv line, so as to provide a basis for fundamentally solving the fault problem.
Disclosure of Invention
In order to solve the technical problems of time and labor consumption and low efficiency in the prior art in a mode of manually judging whether a power-cut public distribution transformer on a 10 kV line belongs to the same branch line, the invention provides a method for judging the power cut of the 10 kV line branch line by adopting a management system.
In order to solve the technical problem, the invention provides a method for judging power failure of a 10 kilovolt line branch line, which comprises the following steps:
s1: in a set period, the management system automatically acquires the public distribution transformer quantity M of all power failures on a 10 kV line, and stores the M in a database;
s2: the management system calls a production management system to automatically acquire all public distribution transformer quantity N on the 10 kV line, and stores N into a database;
s3: the management system determines whether or not the number M of the blackouts is equal to or greater than 2, and continues to step S4 when determining that the number M of the blackouts is equal to or greater than 2;
s4: the management system acquires the power failure time and the power restoration time of all the power failure common distribution transformers and sorts the power failure common distribution transformers according to the power failure time;
s5: by taking the public distribution transformer with the earliest power failure time as a reference, sequentially judging whether the power failure time difference between the power failure time of the rest power failure public distribution transformers and the power failure time difference of the public distribution transformer with the earliest power failure time is within 5 minutes, and whether the power restoration time difference between the power restoration time of the rest power failure public distribution transformers and the power restoration time difference of the public distribution transformer with the earliest power failure time is within 5 minutes, and recording all the power failure public distribution transformers with the time difference within 5 minutes into an M1 group;
repeating the judgment in the power failure common distribution transformation range outside the M1 group until all common distribution transformations are judged to be finished, and recording the corresponding common distribution transformations meeting the conditions into an Mn group;
s6: the management system obtains the public distribution transformation numbers M1 and Mn of the M1 group and the Mn group
S7: when M1 or Mn is judged to be less than 50% of all the public distribution transformation quantity N, the branch line where M or Mn is located is judged to be powered off.
When the method of the invention judges that the 10 KV branch line has power failure, the occurrence of the power failure event of the public distribution transformer subordinate to the branch line is basically caused by the fault of the branch outlet switch equipment at the upper stage of the public distribution transformer, therefore, if the public distribution transformer is only overhauled and the upper stage is not overhauled, the public distribution transformer with the power failure event will frequently have power failure in a short time. Therefore, by adopting the management system and the management method, whether the power failure fault of the public distribution transformer is caused by the branch outlet switch equipment at the upper stage or not can be quickly found.
Preferably, in step S1, before obtaining the number M of the public distribution transformers with power failure on the 10 kv line, it is determined whether each public distribution transformer on the 10 kv line has power failure in a set period, and the following steps are taken:
s01: the management system calls the power utilization information acquisition system to acquire the power failure time and the power restoration time recorded by the public distribution transformer acquisition terminal;
s02: the management system calls an electricity utilization information acquisition system to obtain the voltage loss starting time and the voltage loss ending time of the gateway meter at the outlet side of the public distribution transformer;
s03: the management system judges whether the power failure time recorded by the acquisition terminal is matched with the voltage loss starting time of the gateway meter or not and whether the power restoration time recorded by the acquisition terminal is matched with the voltage loss ending time of the gateway meter or not, and judges that the public distribution transformer has power failure when the power failure time recorded by the acquisition terminal is matched with the voltage loss starting time of the gateway meter or when the power restoration time recorded by the acquisition terminal is matched with the voltage loss ending time of the gateway meter.
The collecting terminal installed at the outlet side of the public distribution transformer has the phenomena of inaccuracy and incompleteness in recording of power failure and power restoration events probably due to the influences of factors such as battery aging, external interference and equipment quality, and the completeness rate can reach 70% through field testing; the voltage data acquisition of the gateway meter installed on the outlet side of the public distribution transformer also has data loss of acquisition failure and abnormal transmission communication, and the accuracy rate can reach 98% through field test. The collection terminal and the gateway meter are used as two independent devices, and abnormal and unreliable data recorded by the collection terminal and the gateway meter can be filtered by judging whether the power failure recovery time recorded by the collection terminal is matched with the voltage loss starting time and the voltage loss ending time recorded by the gateway meter.
The management system judges whether the difference between the power failure time recorded by the acquisition terminal and the voltage loss starting time of the gateway meter is within 5 minutes or not, and when the difference between the power failure time recorded by the acquisition terminal and the voltage loss starting time of the gateway meter is judged to be within 5 minutes, the power failure time recorded by the acquisition terminal is judged to be matched with the voltage loss starting time of the gateway meter;
preferably, in the statistical period obtained by calling the electricity information acquisition system by the management system, when the management system determines that the power failure frequency of the 10 kv line branch line is greater than 2 times, it determines that the 10 kv line branch line has frequent power failure. When the branch line is judged to have frequent power failure, the outlet equipment of the branch line needs to be subjected to key maintenance, and the direction is indicated for maintenance.
Preferably, the statistical period duration is less than or equal to one month.
In the existing power grid information system, a power grid GIS system topology model displays the topological relation of equipment on a power grid line, and whether public distribution transformers belong to the same branch line or not is determined by calling data; the production management system is an equipment operation and maintenance lean management system, and acquires the quantity information of the public distribution transformers on the line by calling the data of the system; the power utilization information acquisition system records the outage and restoration time of the public distribution transformer through an acquisition terminal arranged on the outlet side of the public distribution transformer, and records the output voltage value of the public distribution transformer through a gateway meter arranged on the outlet side of the public distribution transformer.
When the public distribution transformer has power failure, the collection terminal installed on the outlet side records the power failure event and the occurrence time when the three-phase input voltage is lower than 60% of the rated voltage and lasts for one minute, and records the power restoration event when the input voltage of the collection terminal recovers and is higher than 80% of the rated voltage. Meanwhile, when the public distribution transformer has power failure, the collection of the three-phase voltage is null value every 15 minutes, namely the voltage loss time by a gateway meter arranged on the outlet side of the public distribution transformer. Data recorded by an acquisition terminal at the outlet side of the public distribution transformer and a gateway meter are automatically uploaded to a power utilization information acquisition system; in the step of judging the power failure of the 10 kV line branch line, the management system calls the power utilization information acquisition system, the production management system and the power grid GIS topological model as required to obtain related information, and the judgment is carried out according to a judgment method.
The beneficial effects of the invention include:
compared with the mode of manually judging whether the power failure equipment on the 10 kV line belongs to the same branch line in the prior art, the method and the system have the advantages that the management system automatically calls the power consumption information acquisition system and the production management system to acquire related information, and automatically judges whether the power failure equipment on the 10 kV line belongs to the same branch line, so that the efficiency is improved, and the resources are saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates the steps of the method of determining a power outage in a 10 kV branch line of the present invention;
FIG. 2 is a method for determining a power failure in a utility transformer according to the present invention.
Detailed Description
The method provided by the invention is described in detail with specific embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 2, the method for determining the power failure of the 10 kv branch line provided by the invention comprises the following steps:
s1: in a set period of 24h, the management system automatically acquires the public distribution transformer quantity M of power failure on a 10 kV line;
s2: the management system automatically acquires all the public distribution transformer quantity N on the 10 kilovolt line;
s3: when it is determined that the number of common distribution transformers M of the power outage is equal to or greater than 2, continuing to step S4;
s4: acquiring the power failure time and the power restoration time of all power failure common distribution transformers, and sequencing the power failure common distribution transformers according to the power failure time;
s5: by taking the public distribution transformer with the earliest power failure time as a reference, sequentially judging whether the power failure time difference between the power failure time of the rest power failure public distribution transformers and the power failure time difference of the public distribution transformer with the earliest power failure time is within 5 minutes, and whether the power restoration time difference between the power restoration time of the rest power failure public distribution transformers and the power restoration time difference of the public distribution transformer with the earliest power failure time is within 5 minutes, and recording all the power failure public distribution transformers with the time difference within 5 minutes into an M1 group;
repeating the judgment in the power failure common distribution transformation range outside the M1 group until all common distribution transformations are judged to be finished, and recording the corresponding common distribution transformations meeting the conditions into an Mn group;
s6: obtaining the number M1 and Mn of common distribution variables of the M1 group and the Mn group;
s7: and respectively judging whether M1 and Mn are less than 50% of all the public distribution transformer quantity N, and judging that the branch line where M1 or Mn is positioned has power failure when M1 or Mn is less than 50% of all the public distribution transformer quantity N.
Preferably, in step S1, before obtaining the number M of the public distribution transformers with power failure on the 10 kv line, the following steps are taken to determine whether each public distribution transformer on the 10 kv line has power failure:
s01: acquiring power failure time and power restoration time recorded by a public distribution transformer acquisition terminal;
s02: acquiring voltage loss starting time and voltage loss ending time of the gateway meter at the outlet side of the public distribution transformer;
s03: and judging whether the power failure time recorded by the public distribution transformer acquisition terminal is matched with the voltage loss starting time of the gateway meter or not and whether the power restoration time recorded by the acquisition terminal is matched with the voltage loss ending time of the gateway meter or not, and judging that the public distribution transformer has power failure when judging that the power failure time recorded by the acquisition terminal is matched with the voltage loss starting time of the gateway meter and when the power restoration time recorded by the acquisition terminal is matched with the voltage loss ending time of the gateway meter. Preferably, in the statistical period obtained by the management system calling the electricity consumption information acquisition system, when the management system determines that the power failure frequency of the 10 kv line branch line is greater than 2 times, it determines that the 10 kv line branch line has frequent power failure.
Preferably, the statistical period duration is less than or equal to one month.
In summary, compared with the manner of manually determining whether the power failure common distribution transformer on the 10 kv line belongs to the same branch line in the prior art, the scheme provided by the embodiment of the invention automatically calls the power utilization information acquisition system and the production management system through the management system to acquire the related information, and automatically determines whether the power failure common distribution transformer on the 10 kv line belongs to the same branch line, so that the efficiency is improved, and the resources are saved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. A method for judging power failure of a 10 kV line branch line is characterized by comprising the following steps:
s1: acquiring the number M of public distribution transformers with power failure on a 10 kV line in a set period;
s2: acquiring the quantity N of all public distribution transformers on the 10 kV line;
s3: judging whether the number M of the power-failure public distribution transformers is more than or equal to 2, and continuing to the step S4 when the number M of the power-failure public distribution transformers is more than or equal to 2;
s4: acquiring the power failure time and the power restoration time of all power failure public distribution transformers, sequencing the power failure public distribution transformers according to the power failure time, and judging as follows:
by taking the public distribution transformer with the earliest power failure time as a reference, successively judging whether the power failure time difference between the power failure time of other power failure public distribution transformers and the power failure time difference of the public distribution transformer with the earliest power failure time is within 5 minutes, judging whether the power restoration time difference between the power restoration time of other power failure public distribution transformers and the power restoration time difference of the public distribution transformer with the earliest power failure time is within 5 minutes, and recording all power failure public distribution transformers with the time difference within 5 minutes into an M1 subgroup;
repeating the judgment within the range of the power-failure public distribution transformer outside the M1 group until all the public distribution transformers are judged to be finished, and recording the public distribution transformers meeting the conditions into the Mn group;
s5: acquiring the number Mn of public distribution transformers of each group of the Mn group; and respectively judging whether Mn is less than 50% of the number N of all public distribution transformers, and judging that the branch line where Mn is located has power failure when Mn is less than 50% of the number N of all public distribution transformers.
2. The method of claim 1, wherein in step S1, before obtaining the number M of utility transformers out of service on the 10 kv line, determining whether each utility transformer on the 10 kv line is out of service is performed by the following steps:
s01: acquiring power failure time and power restoration time recorded by a public distribution transformer acquisition terminal;
s02: acquiring voltage loss starting time and voltage loss ending time of the meter of the gateway meter on the outlet side of the public distribution transformer;
s03: and judging whether the power failure time recorded by the acquisition terminal is matched with the voltage loss starting time of the gateway meter or not and whether the power restoration time recorded by the acquisition terminal is matched with the voltage loss ending time of the gateway meter or not, and judging that the public distribution transformer has power failure when judging that the power failure time recorded by the acquisition terminal is matched with the voltage loss starting time of the gateway meter and when the power restoration time recorded by the acquisition terminal is matched with the voltage loss ending time of the gateway meter.
3. The method of claim 1, wherein the 10 kv line branch line is determined to be frequently powered off when the number of times of power failure of the 10 kv line branch line is determined to be greater than 2 times in the statistical period.
4. The method of claim 3, wherein the statistical period is less than or equal to one month.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1751562A1 (en) * | 2004-06-04 | 2007-02-14 | FMC Tech Limited | A method of monitoring line faults in a medium voltage network |
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| CN104143823A (en) * | 2012-10-22 | 2014-11-12 | 国网山东省电力公司青岛供电公司 | Blackout event information collecting method and system |
| CN104410067A (en) * | 2014-11-28 | 2015-03-11 | 国家电网公司 | Zone area power failure analyzing method based on common transformer and analysis of big data acquired by users |
| CN104810921A (en) * | 2015-03-30 | 2015-07-29 | 深圳市康拓普信息技术有限公司 | Feeder line disconnection power outage range identifying system and method based on distribution transformer terminal information |
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