CN111443263B - Cable analysis device based on ring main unit and detection method thereof - Google Patents
Cable analysis device based on ring main unit and detection method thereof Download PDFInfo
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- CN111443263B CN111443263B CN202010331079.1A CN202010331079A CN111443263B CN 111443263 B CN111443263 B CN 111443263B CN 202010331079 A CN202010331079 A CN 202010331079A CN 111443263 B CN111443263 B CN 111443263B
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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Abstract
The invention provides a cable analysis device based on a ring main unit, which is characterized in that when cables of a plurality of interval units of the ring main unit are connected and work normally, the cable analysis device is characterized in that: the device comprises at least one temperature sensor, a current transformer, a storage, an arithmetic unit, an analysis module and a background management system, wherein the temperature sensor is arranged at the position of a ring main unit and a cable joint and is in wireless or wired transmission, the storage is in cloud setting or local setting, the arithmetic unit is used for calculating and analyzing data information reported by the temperature sensor, and the background management system is used for monitoring and reporting abnormal events. The invention has the advantages of analyzing the real-time and historical data of the temperature change information of the cable at each interval of the ring main unit, analyzing the insulation level of the cable joint and timely providing early warning for the potential safety hazard of the cable of the ring main unit.
Description
Technical Field
The invention relates to the technical field of power control, in particular to a cable analysis device based on a ring main unit and a detection method thereof.
Background
At present, a plurality of ring main units can monitor the temperature state of a cable on line, but generated temperature data of a cable joint cannot be effectively utilized, only the temperature data is simply judged, an alarm is generated after the temperature is higher than a certain temperature, and the health state of the power cable is not estimated according to the data, such as real-time and historical data of the temperature of the cable at each interval of the ring main units are analyzed; the overall condition of the cable is not pre-judged, the insulation level of a cable joint is analyzed, and early warning of cable faults of the ring main unit is achieved.
Disclosure of Invention
The invention aims to provide a device and a detection method for analyzing the health condition of a cable of a ring main unit and estimating the health condition of the cable of the ring main unit according to temperature data of the cable of the ring main unit, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a cable analysis device based on looped netowrk cabinet, at the cable junction of a plurality of interval units of looped netowrk cabinet, during normal operating condition, its characterized in that: the device comprises at least one temperature sensor, a current transformer, a storage, an arithmetic unit, an analysis module and a background management system, wherein the temperature sensor is arranged at the position of a ring main unit and a cable joint and is in wireless or wired transmission, the storage is in cloud setting or local setting, the arithmetic unit is used for calculating and analyzing data information reported by the temperature sensor, and the background management system is used for monitoring and reporting abnormal events.
The invention also discloses a detection method of the cable analysis device based on the ring main unit, which comprises the following steps:
s1, acquiring the environmental temperature T of the ring main unit through the temperature sensorXAnd the temperature T of the respective cable jointnAnd current InThe data information of the data is recorded once every certain time, such as 15min and 30min, and reported and stored,
s2: the arithmetic unit calculates the relative temperature of each interval of the ring main unit,
the environmental temperature of the ring main unit in a real-time state is taken as a reference value TXRelative temperature YnFor the temperature T at the cable jointnAnd the reference value TXThe absolute value of the difference between;
s3 current transformer obtains current I of each intervalnWhile recording the cross-sectional area A of the cable between the individual spacer elements at initializationnCalculating the heat generation amount of the cable and the change rate C of the heat generation amount of the cable from the model constructed in the arithmetic unitn；
S4 calculator calculating powerRate of change of day C for interval units with stream size greater than 0n
S5, the analysis module analyzes the change rate C of one of the interval unitsnAverage value C of rate of change of interval unit with other interval units not including rate of change of interval unitiCalculating the difference value and the maximum load K born by the ring main unitnComparing the obtained data with each other,
if Cn-Ci＞KnThen, the process proceeds to S6,
if Cn-Ci＜KnThen proceed to S7;
s6: judgment Cn-Ci>N*KnThe partial discharge amount P of the spacing unitnWhether or not it exceeds the limit value LnN belongs to the integer, and N belongs to the integer,
if the potential safety hazard exists, the cable of the interval unit is judged to have the potential safety hazard, and an abnormal event is reported to the background management system cabinet;
s7: recording the daily C of each interval unit in the ring main unitndThe value is calculated according to the least square method to calculate the previous week, previous month and previous March C of each ring network intervalnRate of change R ofn，Rn=∑(Cnd-Cn（d-1）) D, wherein d is the number of days;
when R isnA rate of change of>RpAnd judging that potential safety hazards exist in the cable of the ring main unit interval unit, and reporting an abnormal event to a background management system.
Preferably, in step S3, the model of the rate of change of the temperature of the day is Cn=∑(Yn/Qn-Yn-1/Qn-1)；
Preferably, in step S2, the current data of each interval of the ring network cabinet is set as I1、I2、…、InThe cross-sectional area of each interval cable of the ring main unit is A1、A2、…、AnThe formula Q = ρ × I/a (W/m) for calculating the heat generation amount of the cable, and the heat generation amount Q of the cablen=In*In/AnAnd ρ is the electrical conductivity of copper.
Preferably, wherein An 、Kn、LnSpecification parameters when leaving factory.
Compared with the prior art, the invention has the beneficial effects that:
(1) the real-time and historical data of cable temperature change information of each interval of the ring main unit are analyzed, the insulation level of a cable joint is analyzed, and early warning is timely provided for potential safety hazards of cables of the ring main unit.
(2) The health state of the cable joint of the ring main unit is comprehensively judged according to the multi-azimuth criterion by filtering the influence of the environmental temperature and the load current on the cable temperature and combining the local discharge capacity of the cable.
(3) By comparing the temperature change conditions of the cable interfaces at intervals of the ring main unit, the interference of the actual environment is filtered, and the judgment is more accurate.
Drawings
FIG. 1 is a structural diagram of a monitoring device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
This embodiment provides a cable analysis device based on looped netowrk cabinet, at the cable junction of a plurality of interval units of looped netowrk cabinet, during normal operating condition, its characterized in that: the device comprises at least one temperature sensor, a current transformer, a storage, an arithmetic unit, an analysis module and a background management system, wherein the temperature sensor is arranged at the position of a ring main unit and a cable joint and is in wireless or wired transmission, the storage is in cloud setting or local setting, the arithmetic unit is used for calculating and analyzing data information reported by the temperature sensor, and the background management system is used for monitoring and reporting abnormal events.
The embodiment provides a detection method of a cable analysis device based on a ring main unit, which comprises the following steps:
s1, acquiring the environmental temperature T of the ring main unit through the temperature sensorXAnd the temperature T of the respective cable jointnAnd current InThe data information of the data is recorded once every certain time interval and reported for storage,
s2: the arithmetic unit calculates the relative temperature of each interval of the ring main unit,
the environmental temperature of the ring main unit in a real-time state is taken as a reference value TXCalculating the relative temperature YnFor the temperature T at the cable jointnAnd the reference value TXThe absolute value of the difference between;
s3 current transformer obtains current I of each intervalnWhile recording the cross-sectional area A of the cable between the individual spacer elements at initializationnCalculating the heat generation amount of the cable and the change rate C of the heat generation amount of the cable from the model constructed in the arithmetic unitn；
S4, the arithmetic unit calculates the current magnitude of the interval unit larger than 0n
S5, the analysis module analyzes the change rate C of one of the interval unitsnAverage value C of rate of change of interval unit with other interval units not including rate of change of interval unitiCalculating the difference value and the maximum load K born by the ring main unitnComparing the obtained data with each other,
if Cn-Ci＞KnThen, the process proceeds to S6,
if Cn-Ci＜KnThen proceed to S7;
s6: judgment Cn-Ci>N*KnThe partial discharge amount P of the spacing unitnWhether or not it exceeds the limit value LnAnd N belongs to an integer.
If the potential safety hazard exists, the cable of the interval unit is judged to have the potential safety hazard, and an abnormal event is reported to the background management system cabinet;
s7: recording the daily C of each interval unit in the ring main unitndThe value is calculated according to the least square method to calculate the previous week, previous month and previous March C of each ring network intervalnRate of change R ofn，Rn=∑(Cnd-Cn（d-1）) D, wherein d is the number of days;
when R isnA rate of change of>RpAnd judging that potential safety hazards exist in the cable of the ring main unit interval unit, and reporting an abnormal event to a background management system.
In step S3, the model of the rate of change of the day' S temperature is Cn=∑(Yn/Qn-Yn-1/Qn-1)；
In step S3, the current data of each partition unit of the ring network cabinet is set to I1、I2、…、InThe cross-sectional area of each interval cable of the ring main unit is A1、A2、…、AnThe formula Q = ρ × I/a (W/m) for calculating the heat generation amount of the cable, and the heat generation amount Q of the cablen=In*In/AnAnd ρ is the electrical conductivity of copper.
Wherein A isn 、Kn、LnThe specification parameters are set when the device leaves the factory.
Example 2
As shown in fig. 1, the embodiment provides a detection method for a cable analysis device based on a ring main unit, and a specific operation process of an operator and a comparison module is as follows:
s1 collecting temperature T of cable joints of interval units 1-6 in ring main unit1、T2、T3、T4、T5、T6And calculating and storing the data every 15 minutes according to the ring main unit temperature Tx.
S2, collecting load current information I at intervals of 1-61、I2、I3、I4、I5、I6The data was calculated and stored every 15 minutes. Let I6=0；
S3, calculating the cable heating value Q of the interval units 1-51、Q2、Q3、Q4、Q5The interval unit 6 does not participate in the calculation because the current is 0.
S4, calculating the temperature change rate C of the interval units 1-5 in the day1、C2、C3、C4、C5；
S5, setting the limit value of the relative temperature change rate as KnWhen (C)1-C2）+（C1-C3）+（C1-C4）+（C1-C5）>5*KnWhen the current partial discharge amount P1 is read, and when P1 exceeds the limit value L1, the cable at the interval 1 has potential safety hazard and needs to be overhauled in time.
And S6, calculating the Cn change rates R1, R2, R3, R4 and R5 of the spacing units 1-5 for three months, wherein if R1 is greater than Rp, potential safety hazards exist at intervals, and timely maintenance is needed.
Further, an embodiment of the present invention also provides a computer storage medium, on which a computer program is stored, where the computer program is executed by a processor, and the computer program performs the steps of the method in the above embodiment.
The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
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 (3)
1. A detection method of a cable analysis device based on a ring main unit is characterized in that when cables of a plurality of interval units of the ring main unit are connected and in a normal working state, the device comprises at least one temperature sensor, a current transformer, a storage, an arithmetic unit, an analysis module and a background management system, the temperature sensor is arranged at the position of a cable joint of the ring main unit and is in wireless or wired transmission, the storage is in cloud setting or local setting, the arithmetic unit is used for calculating and analyzing data information reported by the temperature sensor, and the background management system is used for monitoring and reporting abnormal events, and the detection method comprises the following steps:
s1, acquiring the environmental temperature T of the ring main unit through the temperature sensorXAnd the temperature T of the respective cable jointnAnd current InThe data information of the data is recorded once every certain time interval and reported for storage,
s2: the arithmetic unit calculates the relative temperature of each interval of the ring main unit,
the environmental temperature of the ring main unit in a real-time state is taken as a reference value TXCalculating the relative temperature YnFor the temperature T at the cable jointnAnd the reference value TXThe absolute value of the difference between;
s3 current transformer obtains current I of each intervalnWhile recording the cross-sectional area A of the cable between the individual spacer elements at initializationnCalculating the heat generation amount of the cable and the change rate C of the heat generation amount of the cable from the model constructed in the arithmetic unitn；
S4, the arithmetic unit calculates the current magnitude of the interval unit larger than 0n；
S5, the analysis module analyzes the change rate C of one of the interval unitsnAverage value C of rate of change of interval unit with other interval units not including rate of change of interval unitiCalculating the difference value and the maximum load K born by the ring main unitnComparing the obtained data with each other,
if Cn-Ci＞KnThen, the process proceeds to S6,
if Cn-Ci＜KnThen proceed to S7;
s6: judgment Cn-Ci>N*KnThe partial discharge amount P of the spacing unitnWhether or not it exceeds the limit value LnN belongs to the integer, and N belongs to the integer,
if the potential safety hazard exists, the cable of the interval unit is judged to have the potential safety hazard, and an abnormal event is reported to the background management system cabinet;
s7: recording the daily C of each interval unit in the ring main unitntThe value is calculated according to the least square method to calculate the previous week, previous month or previous March C of each ring network intervalnRate of change R ofn，Rn=∑(Cnt-Cn(t-1)) D, wherein t is 1,2,3, …, d; d is the number of days;
when rate of change RnIs composed of>RpAnd judging that potential safety hazards exist in the cable of the ring main unit interval unit, and reporting an abnormal event to a background management system.
2. The method for detecting the cable analysis device based on the ring main unit as claimed in claim 1, wherein: in step S3, the current data of each partition unit of the ring network cabinet is set to I1、I2、…、InThe cross-sectional area of each interval cable of the ring main unit is A1、A2、…、AnCalculating the formula Q = rho I/A of the heat productivity of the cable, and calculating the heat productivity Q of the cablen=ρ*In*In/AnAnd ρ is the electrical conductivity of copper.
3. The method for detecting the cable analysis device based on the ring main unit as claimed in claim 2, wherein: wherein A isn 、Kn、LnThe specification parameters are set when the device leaves the factory.
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| CN114200272B (en) * | 2022-02-17 | 2022-04-26 | 山东汇能电气有限公司 | Switch cabinet health state operation feedback system based on partial discharge detection |
| CN116930819B (en) * | 2023-09-18 | 2023-12-08 | 云南电网有限责任公司 | Current terminal strip temperature on-line monitoring method and system based on thermal imaging |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005283148A (en) * | 2004-03-26 | 2005-10-13 | Tokyo Electric Power Co Inc:The | Conductor temperature estimation method of power cable |
| CN101046501A (en) * | 2005-06-10 | 2007-10-03 | 清华大学 | Cable running safety monitoring method |
| CN203310520U (en) * | 2013-04-28 | 2013-11-27 | 山东康威通信技术股份有限公司 | Electric power high and low voltage cable branch box and switch cabinet non-contact infrared temperature measurement system |
| CN103676888A (en) * | 2013-12-17 | 2014-03-26 | 北京合锐赛尔电力科技有限公司 | System and method for monitoring ring main unit cable joint temperature |
| CN105223463A (en) * | 2015-10-08 | 2016-01-06 | 国网北京市电力公司 | The monitoring system of ring main unit and method |
| CN106597961A (en) * | 2017-02-22 | 2017-04-26 | 国家电网公司 | Ring network cabinet environment monitoring system and method thereof |
| CN106771833A (en) * | 2017-02-25 | 2017-05-31 | 广东万家乐燃气具有限公司 | The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit |
-
2020
- 2020-04-24 CN CN202010331079.1A patent/CN111443263B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005283148A (en) * | 2004-03-26 | 2005-10-13 | Tokyo Electric Power Co Inc:The | Conductor temperature estimation method of power cable |
| CN101046501A (en) * | 2005-06-10 | 2007-10-03 | 清华大学 | Cable running safety monitoring method |
| CN203310520U (en) * | 2013-04-28 | 2013-11-27 | 山东康威通信技术股份有限公司 | Electric power high and low voltage cable branch box and switch cabinet non-contact infrared temperature measurement system |
| CN103676888A (en) * | 2013-12-17 | 2014-03-26 | 北京合锐赛尔电力科技有限公司 | System and method for monitoring ring main unit cable joint temperature |
| CN105223463A (en) * | 2015-10-08 | 2016-01-06 | 国网北京市电力公司 | The monitoring system of ring main unit and method |
| CN106597961A (en) * | 2017-02-22 | 2017-04-26 | 国家电网公司 | Ring network cabinet environment monitoring system and method thereof |
| CN106771833A (en) * | 2017-02-25 | 2017-05-31 | 广东万家乐燃气具有限公司 | The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit |
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