CN102866289B - Power cable sheath grounding current fault analysis method - Google Patents
Power cable sheath grounding current fault analysis method Download PDFInfo
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Abstract
The invention discloses a power cable sheath grounding current fault analysis method which comprises the steps of 1, setting parameter information in a monitoring platform; 2, loading number and name information of each monitoring terminal in the monitoring platform; 3, receiving a present current value and collection time collected by each monitoring terminal by the monitor platform through a network mode in real time; 4, when receiving the present current value every time, enabling the monitoring platform to respectively carry one-time jump analysis on a grounding current collected by each monitoring terminal; 5, each time receiving the present current value, enabling the monitoring platform to respectively carry out one-time zero drift analysis on the grounding current collected by each monitoring terminal; 6, regularly carrying out fluctuation analysis on a grounding current value collected by each monitoring terminal by the monitor platform; and 7, outputting an analysis result of each monitoring terminal from the monitoring platform.
Description
Technical field
The present invention relates to a kind of power cable sheath grounding current monitoring field, relate in particular to the failure analysis methods of sheath grounding current.
Background technology
Along with sustained economic growth, urban distribution network fast development, Modern Urban Living and production are increasing to the dependence of electric power, the failure-free operation that modern urban construction is carried electric power is had higher requirement, urban aerial circuit power transmission is replaced by underground high voltage cable, the quantity of underground high voltage cable just sharply rises, and therefore the operation monitoring of underground high voltage cable is become to particularly important.Traditional on-line monitoring mode generally adopts the mode of cable grounding current monitoring to carry out on-line monitoring to the operation conditions of underground electric power tunnel cable, this mode needs experienced operator on duty regularly ground current history curve to be analyzed to summary, on the one hand, operator on duty does not possess real-time to the analysis of ground current history curve, after often can only waiting cable fault to occur, the Changing Pattern of analyzing failure cause and fault generating process ground current; On the other hand, need experienced operator on duty to participate in ground current analysis, caused the waste of human resources.Therefore, cable fault analysis expert system is set up in electric system an urgent demand, and cable fault is carried out to classification model construction analysis, improves the early warning before cable fault occurs, and reduces the failure rate in cable operational process.
Summary of the invention
Object of the present invention is exactly in order to address the above problem, and a kind of power cable sheath grounding current analytical approach is provided.The method, by the on-line analysis to power cable sheath grounding current, is made assessment to the running status of cable body, and the cable running status that ground current analysis is drawn is notified in time to operator on duty.The method is on the basis of original ground current on-line monitoring, the sudden change of ground current and slow variation are carried out to analysis and filter, before there are unusual fluctuations or break down in power cable operation, can automatically make in time early warning, further improve the safe operation grade of power cable.
The present invention, in order to reach above object, provides a kind of failure analysis methods of power cable sheath grounding current, comprises the following steps:
Step 1 is setup parameter information in monitor supervision platform, comprises the effective number of minimum and the fluctuation threshold values of positive change rate threshold values, inverse change rate threshold values, drift analysis current threshold, drift analysis times threshold values, counter initial value, timing, current value;
Step 2 loads numbering, the name information of each monitor terminal in monitor supervision platform;
Current current value and acquisition time that step 3 monitor supervision platform is gathered by each monitor terminal by the real-time reception of the mode of network; This current value is for the on-line analysis of step (4), step (5), step (6);
Once current current value of the every reception of step 4, monitor supervision platform just carries out a saltus step analysis to the ground current of each monitor terminal collection respectively, and the current value of described saltus step analysis and utilization collection and positive change rate threshold values, inverse change rate threshold values compare analysis;
Once current current value of the every reception of step 5, monitor supervision platform just carries out a drift analysis to the ground current of each monitor terminal collection respectively, and current threshold is analyzed in the current value of described drift analysis and utilization collection and drift, drift analysis times threshold values is analyzed;
The timing of step 6 monitor supervision platform is carried out fluction analysis to the ground current value of each monitor terminal collection, and described fluction analysis is to utilize the current value after calculating to compare analysis with fluctuation threshold values;
Step 7 is exported the analysis result of each monitor terminal in monitor supervision platform.
Described step 4 ground current saltus step analytical procedure is as follows:
(1) judge whether it is current value for the first time, if so, analyze and finish, if not, forward (2) step to;
(2) judge last time, whether current value was zero; If so, analyze and finish, if not, forward (3) step to;
(3) judge saltus step type, if positive transition forwards step (4) to and carries out positive transition analysis; If oppositely saltus step, forwards step (5) to and carries out reverse saltus step analysis;
(4) rate of change of calculating current value, judges whether rate of change exceedes positive change rate threshold values, if so, sends positive transition fault warning, analyzes and finishes; If not, analyze and finish;
(5) rate of change of calculating current value, judges whether rate of change exceedes inverse change rate threshold values, if so, sends reverse jump failure alarm, analyzes and finishes; If not, analyze and finish;
The determination methods of the saltus step type described in step (3) is: the current current value of ground current, and being greater than the last current value gathering of ground current is positive transition; The current current value of ground current, being less than or equal to the last current value gathering of ground current is reverse saltus step;
The computing formula of the rate of change of the current value described in step (4) or step (5) is:
R=（|I1–I0|）/I0 （1）
In formula, R: the rate of change of current value; I0: the last current value gathering of ground current acquisition terminal; I1: the current value of this collection of ground current acquisition terminal;
The step that described step 5 ground current drift is analyzed is as follows:
(1) judge whether current value is less than drift and analyzes current threshold, and if so, counter adds 1, forwards step (2) to; If not, counter zero clearing, analyzes and finishes;
(2) judge whether counter is greater than drift analysis times threshold values, if so, sends the alarm of drift analysis of failure, analyze and finish; If not, analyze and finish;
The concrete step of described step 6 ground current fluction analysis is as follows:
(1) the fluction analysis timer of startup monitor supervision platform, judges whether timer arrives timing, if so, forwards step (2) to; If not, analyze and finish;
(2) judge whether current period current value number exceedes minimum effectively number, if so, forwards step (3) to, if not, analyzes and finishes;
(3) whether the upper periodic current value number of judgement exceedes minimum effectively number, if so, forwards step (4) to; If not, analyze and finish;
(4) current period carries out integral operation to current value and time, and result of calculation is f(a), f(a) be the integrated value of current period;
(5) a upper cycle is carried out integral operation to current value and time, and result of calculation is f(b), f(b) be the integrated value in a upper cycle;
(6) result of calculation value a; The technology formula of described a is as shown in Equation (2):
a=(|f(a)–f(b)|)/f(b) （2）
(7) whether judged result value a is greater than the fluctuation threshold values of setting, if so, starts fluction analysis fault warning, analyzes and finishes; If not, analyze and finish.
The described computing formula that current value and time are carried out to integral operation of step (4) or step (5) is as shown in (3):
f(I)=∫(I1–I0)/2*dt （3）
In formula: f (I) is integral operation result; I0: the last current value gathering of ground current acquisition terminal; I1: the current value of this collection of ground current acquisition terminal; , dt is this mistiming that gathers current value and gathered current value last time of ground current acquisition terminal.
Described step 7 analysis result output, refers to by after saltus step analysis, drift analysis, fluction analysis, if monitor ground current value ANOMALOUS VARIATIONS, can at once fault analysis result be sent to operator on duty.
A failure analysis methods for power cable sheath grounding current is to realize in the framework being made up of monitor supervision platform, monitoring host computer, monitor terminal.The data upload gathering is arrived monitoring host computer by monitor terminal, monitoring host computer is transferred to monitor supervision platform by the data of receiving by network communication mode, the server being provided with in monitor supervision platform carries out analyzing and processing to the monitor data gathering in real time, analysis result is presented on monitor supervision platform, so that for managerial personnel provide effective Monitoring Data, analyzing failure cause or early warning in early stage.
Described monitor terminal is a kind of hardware device that adopts high integration and ultralow Consumption, and this equipment is installed in electric power tunnel, various environmental datas in electric power tunnel are gathered, then by data upload to monitoring host computer;
Described monitoring host computer is the equipment that connects monitor supervision platform and monitor terminal, and the device data that its acquisition monitoring terminal collects, is sent to monitor supervision platform after data encapsulation.Monitoring host computer is transferred to monitor supervision platform by the data of receiving in the mode of TCP/IP Ethernet interface.
Described monitor supervision platform possesses the function that data receiver, data processing, alarm generation, real time monitoring, history are checked.Monitor supervision platform is supported the access of multiple common equipment, can control and data response monitored equipment fast, and have open framework, is convenient to the access of expanded function and third-party platform.This platform can carry out according to user's demand the increase and decrease of module, meets the demand of user's different levels.
Described positive transition, finger vagabond current currency, is greater than the last current value gathering of ground current; Oppositely saltus step, finger vagabond current currency, is less than or equal to the last current value gathering of ground current.
Described positive transition analysis, in the time of ground current generation positive transition, when rate of change exceedes the threshold value of setting, analysis module is thought the saltus step of forward ground current is occurred.
Described reverse saltus step analysis, in the time that reverse saltus step occurs ground current, rate of change is greater than zero, and while being less than the threshold value of setting, and analysis module is thought reverse ground current saltus step is occurred.
Described step 5 ground current drift is analyzed, and on the one hand, on cable sheath ground wire, may occur induction current; On the other hand, may there is Acquisition Error in cable sheath ground current acquisition terminal.Therefore,, when cable sheath ground current is actual while being 0A, the current value that cable sheath ground current acquisition terminal collects may be OA, may be also a value of being a bit larger tham OA.So, in the time that sheath grounding current is continuously for several times less than a certain ground current threshold value, can think that this cable sheath ground connection breaks down, i.e. drift analysis.
Described step 6 ground current fluction analysis, refers to that cable sheath ground current can carry out cyclical variation along with the cyclical variation of city peak of power consumption and low power consumption every day.Therefore, if taking current ground current acquisition time as the end time, integral operation is carried out in ground current and acquisition time interval in 24 hours, this integral operation result, the difference with the integral operation result of the previous day, should be less than a certain threshold value.If integral result difference is more than or equal to a certain threshold value, there is larger fluctuation in this cable sheath ground current, and ground current fluction analysis is abnormal.
Beneficial effect of the present invention:
Power cable sheath grounding current failure analysis methods, by the on-line analysis to electric power tunnel ground current, can be found hidden danger and fault in cable operational process within the very first time.This analytical approach concludes by the ground current Changing Pattern before cable fault is occurred and when fault occurs summarys, can open circuit to imperfect earth, partial short-circuit, part, the situation of the slow variation of thunderbolt, electric current, the lasting rising of load, load continuous decrease provides early warning in time; Can provide in time alarm to the situation of tripping operation, short circuit.The enforcement of this analytical approach, both improve the real-time that cable hidden danger and cable fault are disposed, avoided again the waste of manpower and materials, improved to a great extent the safe operation of cable, effectively prevent the further expansion of hidden danger and fault, reduced to greatest extent loss.Native system is real-time, compatible good, simple to operate, has realized the intelligent analysis processing of cable running status, for the safe operation of power cable provides guarantee.
Brief description of the drawings
Fig. 1 is power cable sheath grounding current failure analysis methods system architecture schematic diagram
Fig. 2 cable sheath ground current analytic process schematic diagram;
Fig. 3 is that schematic diagram is analyzed in the saltus step of cable sheath ground current;
Fig. 4 is that schematic diagram is analyzed in the drift of cable sheath ground current;
Fig. 5 is cable sheath ground current fluction analysis schematic diagram.
In figure, 1. setup parameter information, 2. loads monitor terminal information, 3. receives ground current currency, 4. ground current saltus step is analyzed, and 5. ground current drift is analyzed, 6. ground current fluction analysis, 7. ground current analysis result output, 8. monitor supervision platform, 9. monitoring host computer, 10. monitor terminal.
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As Fig. 1, power cable sheath grounding current failure analysis methods system architecture schematic diagram, it comprises monitor supervision platform 8, and the monitoring host computer 9 and the monitor terminal 10 that are connected successively with monitor supervision platform 8.
Monitoring host computer 9 is arranged in transformer station, as the medium between monitor supervision platform 8 and monitor terminal 10, realizes the conversion of the communication protocol of monitor supervision platform 8 network services and monitor terminal 10, realizes remote power feeding to monitor terminal 10, and communication such as patrols and examines at a series of functions.
Monitor terminal 10 can detect cable sheath ground current and fault current, and monitor terminal 10 adopts ultralow Consumption, has realized Real-Time Monitoring and the collection that under conventional power consumption, cannot realize.
Between monitor terminal 10 and monitoring host computer 9, adopt bus to be connected, by monitoring host computer 9 remote power feedings, communication adopts polling mode.
As Fig. 2, cable sheath ground current analytic process, first, ground current analysis module setup parameter information 1 and loading monitor terminal information 2; Then, analysis module receives the currency 3 of ground current in real time, and every reception primary current currency triggers ground current saltus step analysis 4 and ground current drift and analyzes 5.Analysis module timing is carried out fluction analysis to ground current; Finally, analysis module, by the fault output after analyzing, notifies operator on duty to dispose.
Ground current saltus step analyzes 4, can effectively judge the sudden change of ground current; Ground current drift analyzes 5 can make effective judgement to tripping operation, disconnection fault; Ground current fluction analysis 6 can continue to the slow variation of ground current, load the situation of rising or load continuous decrease, makes good analysis judgement.Ground current saltus step analysis 4 and ground current fluction analysis 6, can accomplish the timely early warning before cable fault; Ground current drift analyze 5 can realize after cable fault and alarm.Three kinds of analytical approachs organically combine, the safe operation that can greatly improve cable.
As Fig. 3, the saltus step of cable sheath ground current analyzes 4, and the ground current that receives the collection of cable sheath ground connection acquisition terminal triggers this analysis process.
Positive change rate threshold value and inverse change rate threshold value, manually set by operator on duty.
While carrying out positive transition analysis and reverse saltus step analysis, calculate the rate of change of curent change according to following formula.Wherein, R: ground current rate of change; I0: the last current value gathering of ground current acquisition terminal; I1: the current value of this collection of ground current acquisition terminal:
R=（+|I1–I0|）/I0 （1）
If receive for the first time the current value of acquisition terminal, owing to there is no the last current value gathering, therefore, cannot complete the comparison of current value, analyze and finish.
According to ground current rate of change computing formula, last current value I 0 is as divisor, if last current value is zero, this computing formula cannot complete, and therefore, analyzes and finishes.
The judgement of saltus step type, judges that this saltus step is positive transition or oppositely saltus step.If positive transition is calculated rate of change, and judge whether rate of change exceedes positive change rate threshold value, and rate of change exceedes positive change rate threshold value, sends positive transition fault warning, notifies operator on duty, analyze and finish; If oppositely saltus step is calculated rate of change, and judged whether rate of change exceedes inverse change rate threshold value, and rate of change exceedes inverse change rate threshold value, sends reverse jump failure alarm, notifies operator on duty, analyze and finish.
Ground current saltus step analyzes 4, can effectively judge the sudden change of ground current.Ground current sudden change, normally open circuit, be struck by lightning and cause by imperfect earth, partial short-circuit, part, analyze 4 by ground current saltus step, can effectively find the hidden danger in cable operational process, and adopt an effective measure in time, avoid the further diffusion of hidden danger and accident.
As Fig. 4, the drift of cable sheath ground current analyzes 5, and the ground current that receives the collection of cable sheath ground connection acquisition terminal triggers this analysis process.
5 current thresholds are analyzed in drift and 5 frequency threshold value are analyzed in drift, manually set by operator on duty.5 frequency threshold value are analyzed in drift, are mainly used to filter acquisition terminal and do not collect once in a while the situation of current value (while not collecting current value, reporting 0A), reduce the wrong report of analysis module.
Counter is used for that current value is less than to drift and analyzes the situation of 5 current thresholds and carry out accumulated counts.
Analyze 5 current thresholds if current value is more than or equal to drift, counter O reset, analyzes and finishes.
Current value is less than drift and analyzes 5 current thresholds, and counter adds one.Analyze 5 frequency threshold value if the value of this counter is less than or equal to drift, analyze and finish; Analyze 5 frequency threshold value if the value of this counter is greater than drift, think that drift occurs analyzes 5 fault warnings, analysis module sends drift and analyzes 5 fault warning information, notifies operator on duty.
Due to tripping operation or broken string that thunderbolt, short circuit cause, ground current drift analyzes 5 can make judgement timely and effectively, and in time fault warning is notified to operator on duty.Analyze 5 by ground current drift and can greatly shorten the time of finding cable operation troubles and solving cable operation troubles, reduced the loss that power-off brings.
As Fig. 5, cable sheath ground current fluction analysis 6, carries out clocked flip analysis by fluction analysis 6 timers.Adopt timing mode carry out fluction analysis 6 main because: on the one hand, fluction analysis 6 carries out integral operation to the current value of a day, and calculated amount is larger, if adopt received current value trigger mode of operation, higher to the performance requirement of computing machine; On the other hand, ground current fluction analysis 6, is mainly used to the slow variation of analysis waveform, and the abnormal saltus step of a ground current can not cause fluction analysis alarm, therefore, adopts timer timing analysis more reasonable.
The minimum effectively number of fluction analysis 6 threshold values and fluction analysis 6, manually sets by operator on duty.
Cable sheath ground current integral operation formula is as follows, and f (I) is integral operation result; I0: the last current value gathering of ground current acquisition terminal; I1: the current value of this collection of ground current acquisition terminal; Dt is this mistiming that gathers current value and gathered current value last time of ground current acquisition terminal:
f(I)=∫(I1–I0)/2*dt （3）
Timer arrives timing, starts fluction analysis, conventionally at interval of within 1 hour, carrying out one time fluction analysis.
Current period and upper one-period, if current value number is less than or equal to the minimum effectively number of fluction analysis 6, analyzes and finish.By above judgement, can reduce the current period and the upper cyclic curve different wave shape that cause very little due to current value larger, cause and analyze wrong report.
According to above-mentioned integral operation formula, calculated respectively integrated value f (a) and the integrated value f in a upper cycle (b) of current period, and according to following formula result of calculation value a:
a=(|f(a)–f(b)|)/f(b) （2）
If end value a is greater than fluction analysis 6 threshold values, send fluction analysis 6 fault warnings, notify operator on duty.
Fluction analysis 6 can continue to the slow variation of ground current, load the situation of rising or load continuous decrease, make good analysis judgement, and make in time early warning, operator on duty can be according to fluction analysis 6 results, take measures in time, avoid the further expansion of hidden danger.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make still in protection scope of the present invention.
Claims (8)
1. the failure analysis methods of power cable sheath grounding current, comprises the following steps, and it is characterized in that:
Step 1 is setup parameter information in monitor supervision platform, comprises the effective number of minimum and the fluctuation threshold values of positive change rate threshold values, inverse change rate threshold values, drift analysis current threshold, drift analysis times threshold values, counter initial value, timing, current value;
Step 2 loads numbering, the name information of each monitor terminal in monitor supervision platform;
Current current value and acquisition time that step 3 monitor supervision platform is gathered by each monitor terminal by the real-time reception of the mode of network; This current value is for the on-line analysis of step 4, step 5, step 6;
Once current current value of the every reception of step 4, monitor supervision platform just carries out a saltus step analysis to the ground current of each monitor terminal collection respectively, and the current value of described saltus step analysis and utilization collection and positive change rate threshold values, inverse change rate threshold values compare analysis;
Once current current value of the every reception of step 5, monitor supervision platform just carries out a drift analysis to the ground current of each monitor terminal collection respectively, and current threshold is analyzed in the current value of described drift analysis and utilization collection and drift, drift analysis times threshold values is analyzed;
The timing of step 6 monitor supervision platform is carried out fluction analysis to the ground current value of each monitor terminal collection, utilizes the ground current value after calculating to compare analysis with fluctuation threshold values;
Step 7 is exported the analysis result of each monitor terminal in monitor supervision platform.
2. the failure analysis methods of power cable sheath grounding current as claimed in claim 1, is characterized in that: described step 4 ground current saltus step analytical procedure is as follows:
(1) judge whether it is current value for the first time, if so, analyze and finish; If not, forward (2) step to;
(2) judge last time, whether current value was zero, if so, analyze and finish; If not, forward (3) step to;
(3) judge saltus step type, if positive transition forwards step (4) to and carries out positive transition analysis; If oppositely saltus step, forwards step (5) to and carries out reverse saltus step analysis;
(4) rate of change of calculating current value, judges whether rate of change exceedes positive change rate threshold values, if so, sends positive transition fault warning, analyzes and finishes; If not, analyze and finish;
(5) rate of change of calculating current value, judges whether rate of change exceedes inverse change rate threshold values, if so, sends reverse jump failure alarm, analyzes and finishes; If not, analyze and finish.
3. the failure analysis methods of power cable sheath grounding current as claimed in claim 1, is characterized in that: the step that described step 5 ground current drift is analyzed is as follows:
(1) judge whether current current value is less than drift and analyzes current threshold, and if so, counter adds 1, forwards step (2) to; If not, counter zero clearing, analyzes and finishes;
(2) judge whether counter is greater than drift analysis times threshold values, if so, sends the alarm of drift analysis of failure, analyze and finish; If not, analyze and finish.
4. the failure analysis methods of power cable sheath grounding current as claimed in claim 1, is characterized in that: the concrete step of described step 6 ground current fluction analysis is as follows:
(1) the fluction analysis timer of startup monitor supervision platform, judges whether timer arrives timing, if so, forwards step (2) to; If not, analyze and finish;
(2) judge that whether current period current value number exceedes minimum effectively number, if so, forwards step (3) to; If not, analyze and finish;
(3) whether the upper periodic current value number of judgement exceedes minimum effectively number, if so, forwards step (4) to; If not, analyze and finish;
(4) current period carries out integral operation to current value and time, and result of calculation is f (a), the integrated value that f (a) is current period;
(5) a upper cycle is carried out integral operation to current value and time, and result of calculation is f (b), and f (b) was the integrated value in a upper cycle;
(6) result of calculation value a; The calculating of described a is as shown in formula (1):
a＝(|f(a)–f(b)|)/f(b) (1)
(7) whether judged result value a is greater than the fluctuation threshold values of setting, if so, sends fluction analysis fault warning, analyzes and finishes; If not, analyze and finish.
5. the failure analysis methods of power cable sheath grounding current as claimed in claim 1, it is characterized in that: described step 7 analysis result output, refer to by after saltus step analysis, drift analysis, fluction analysis, if monitor ground current value ANOMALOUS VARIATIONS, can at once fault analysis result be sent to operator on duty.
6. the failure analysis methods of power cable sheath grounding current as claimed in claim 2, it is characterized in that: the determination methods of the saltus step type described in step (3) is: the current current value of ground current, being greater than the last current value gathering of ground current is positive transition; The current current value of ground current, being less than or equal to the last current value gathering of ground current is reverse saltus step.
7. the failure analysis methods of power cable sheath grounding current as claimed in claim 2, is characterized in that: the computing formula of the rate of change of the current value described in step (4) or step (5) is:
R＝(|I1–I0|)/I0 (2)
In formula, R: the rate of change of current value; I0: the last current value gathering of ground current acquisition terminal; I1: the current value of this collection of ground current acquisition terminal.
8. the failure analysis methods of power cable sheath grounding current as claimed in claim 4, is characterized in that: the described computing formula that current value and time are carried out to integral operation of step (4) or step (5) is as shown in formula (3):
f(I)＝∫(I1–I0)/2*dt (3)
In formula: f (I) is integral operation result; I0 is the last current value gathering of ground current acquisition terminal; I1 is the current value of this collection of ground current acquisition terminal; Dt is this mistiming that gathers current value and gathered current value last time of ground current acquisition terminal.
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| CN106645870B (en) * | 2016-11-30 | 2019-05-17 | 山东康威通信技术股份有限公司 | The earth current safe early warning specialist analytical method of cable in a kind of tunnel |
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