CN103954887A - Power line insulation monitoring method based on instant fault - Google Patents
Power line insulation monitoring method based on instant fault Download PDFInfo
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- CN103954887A CN103954887A CN201410125670.6A CN201410125670A CN103954887A CN 103954887 A CN103954887 A CN 103954887A CN 201410125670 A CN201410125670 A CN 201410125670A CN 103954887 A CN103954887 A CN 103954887A
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- insulation
- coefficient
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Abstract
The invention relates to a power line insulation monitoring method based on an instant fault. According to the method, on-line monitoring is carried out on a line through an on-site line selection device, and when the line breaks down, fault information such as the frequency, duration and intensity of the instant fault of the faulty line is recorded to work out the insulation coefficient. The insulation condition of the line can be accurately monitored under the condition of uninterruptible power supply. By means of the method, targeted power failure overhaul can be carried out on the line, so that the frequency of power failure caused by the fault is lowered, the duration of power failure is shortened, the power failure range is reduced, damage caused by regular preventable high-voltage tests on a cable is avoided, and unnecessary loss and resource waste are reduced.
Description
Technical field
The present invention relates to a kind of insulated monitoring method of the power circuit based on transient fault; be the insulation warning algorithm that a kind of line insulation coefficient that utilizes number of times, duration, intensity that transient fault occurs in unit interval T on circuit to determine is monitored the insulation of circuit, belong to distribution network failure protection field.
Background technology
One, for a long time, be the generation of Accident prevention, power circuit is adhered to regularly carrying out always to the system of preventive trial; Comparatively effectively power system insulation monitoring is that power circuit is carried out to on-line monitoring at present, makes electric system from preventative maintenance step transition to the foreseeability stage.
Two, along with the insulation degradation degree of medium voltage distribution network power equipment constantly declines, the number of times of instantaneity insulation fault ground connection is continuous ascendant trend on the whole, and finally insulation thoroughly destroys and causes permanent earth fault.The state of insulation that therefore can utilize the instantaneity insulation parameter reaction circuit such as instantaneity insulation fault ground connection frequency, frequency and duration of circuit in circuit a period of time, utilizes these parameters to make comprehensive assessment to the state of insulation of circuit.
Utilize that transient fault insulate to current power distribution network that when assessment mainly considers because have: the duration T of instantaneity earth fault
coki, instantaneity earth fault zero mode voltage effective value T
0ki, this earth fault is apart from the time interval T of the front earth fault of this circuit
dSki, instantaneity earth fault impact eliminate time T
cLki, there is the times N of instantaneity earth fault in 24 hours in this circuit
ki.Consider the instantaneity insulation fault parameter of the degree of above reflection insulation degradation, calculate the insulation degradation value D on the same day of certain circuit
k:
In formula: N
zkbe k article of circuit from having started to calculate the accumulative total number of stoppages since degradation value; A
ffor accumulative total factor of influence, can be taken as constant value 0.1; In formula, set constant the 10, the 360th, for the difference between balance parameters units magnitude, and gives different flexible strategy to the parameter of different significance levels; If there is again new transient fault less than 1 month in the interval, main consideration front and back that arranges of constant 30, think insulation degradation speed accelerate.
By the insulation degradation value D of circuit
kcompare with the insulation degradation threshold value of setting, the state of insulation that is greater than threshold value and is this circuit of alarm is seriously deteriorated.
Prior art will be integrated into an insulation degradation value to the influential each factor of line insulation, according to each factor, the size of line insulation influence degree not arranged to concrete weight coefficient to each influence factor; Prior art is just provided with one-level insulation degradation threshold value, and the damaged condition neither one of line insulation is judged accurately.
Summary of the invention
Because the deficiencies in the prior art, the object of the invention is to allow keeper have a understanding more accurately to line insulation situation, can be in the situation that not having a power failure the insulation status of Monitoring Line accurately, by real-time the insulation status of circuit showing, to take appropriate measures.
The present invention adopts following scheme to realize: a kind of insulated monitoring method of the power circuit based on transient fault, is characterized in that comprising the following steps:
Step S01: power circuit is carried out to on-line monitoring;
Step S02: if break down Xian road in the circuit of monitoring, start insulation early warning calculation procedure, and carry out next step; Otherwise return to step S01;
Step S03: carry out failure line selection record trouble information;
Step S04: the setting valve of setting line insulation coefficient;
Early warning system insulating coefficient is set to two-stage setting valve C
1, C
2, wherein C
1<C
2, as line insulation coefficient 0≤ξ≤C
1time, the insulation of circuit has slight damage; As line insulation coefficient C
1≤ ξ≤C
2time, the insulation of circuit is subject to damage to a certain extent; As line insulation coefficient ξ>=C
2time, line insulation is subject to badly damaged;
Step S05: the number of stoppages, duration, intensity failure message that read failure circuit occurs in unit interval T;
Step S06: the insulating coefficient of computational scheme;
According to early warning system, the testing result of circuit is calculated the insulation early warning coefficient ξ of whole piece circuit,
ξ=aα+bβ+cγ
In formula, α, β, γ are respectively the corresponding insulation early warning of number of times, duration and the intensity coefficient of circuit generation transient fault in regular hour T; A, b, c are respectively corresponding weight coefficient;
In regular hour T, the corresponding insulation early warning of number of times, duration and intensity factor alpha, β, the γ of circuit generation transient fault are respectively:
In formula, N is the insulation early warning transient fault number of times of expecting; N is the number of times of power circuit generation transient fault in unit interval T; t
ikfor the duration of the each transient fault of circuit in unit interval T; D is the threshold of determining permanent fault; u
ikfor the voltage strength of circuit generation transient fault in unit interval T, U is the voltage peak of metallicity fault; R, s, m are corresponding coefficient;
Step S07: by the threshold value contrast of insulating coefficient and early warning, judge whether to meet the condition of early warning of insulating;
Step S08: send insulation early warning signal, report early warning information and take appropriate measures according to the insulation damages situation of circuit.
In an embodiment of the present invention, described condition comprises: as line insulation coefficient 0≤ξ≤C
1time, the early warning of needn't insulating; As line insulation coefficient C
1≤ ξ≤C
2time, send insulation early warning signal and report early warning information, carry out interruption maintenance in the time that is less than a predetermined impact on producing; As line insulation coefficient ξ>=C
2time, the early warning system that need to insulate is sent early warning signal immediately, and interruption maintenance immediately;
In an embodiment of the present invention, described measure comprises: as line insulation coefficient 0≤ξ≤C
1time, needn't interruption maintenance; As line insulation coefficient C
1≤ ξ≤C
2time, carry out interruption maintenance in the time that is less than a predetermined impact on producing; As line insulation coefficient ξ>=C
2time, need interruption maintenance immediately.
The present invention is according to the number of times of circuit generation transient fault, duration, the size of strength information to line insulation influence degree, in the time calculating insulation early warning coefficient, it is added to corresponding weight coefficient, make the line insulation coefficient calculating more approach actual conditions, line insulation situation is set to two-stage threshold value, like this line insulation situation is had to a understanding more accurately.Can be in the situation that not having a power failure the insulation status of Monitoring Line accurately, can carry out interruption maintenance targetedly to circuit, so not only reduce fault outage number of times, shorten power off time, reduce power failure range, the damage to cable of regular preventative high-potting be can also avoid, unnecessary loss and the wasting of resources reduced.
Embodiment
The present invention utilizes on-the-spot line selection apparatus to select faulty line, the failure messages such as the number of times of record trouble circuit generation transient fault, duration, intensity, calculate the insulating coefficient of its corresponding insulating coefficient and whole piece circuit, the insulating coefficient of circuit is compared with early warning threshold value and determine whether to insulate early warning, implementation procedure is:
(1) power circuit is carried out to on-line monitoring; Insulation early warning system is mainly made up of the calculation procedure of line selection apparatus, industrial computer, insulation early warning program, insulating coefficient, data processing module, communication module etc., line selection apparatus must be dynamic to the record of line fault data,, remain in store circuit unit interval T(T=24 hour in the industrial computer of line selection apparatus) in all data of transient fault.In the computation process of the route selection of line selection apparatus, institute's Monitoring Line insulation early warning coefficient, needed voltage and current signal is all to obtain by on-the-spot voltage current transformer, wherein residual voltage, zero-sequence current obtained direct and indirect two kinds of modes: direct mode is to obtain by residual voltage, zero sequence current mutual inductor; Indirect mode is to obtain after synthesizing by three-phase voltage, electric current.When system is normally moved, generally do not have zero-sequence component, residual voltage, electric current that directly metering system obtains are exactly false voltage, electric current.And under indirect metering system, due to TA error, unit simulation processing of circuit and the error of calculation etc., even if in primary voltage electric current symmetry, not there is not zero-sequence component in the situation that, be added by three phase components the power frequency zero sequence value obtaining also non-vanishing, this component is called unbalanced component.For the accuracy that ensures that fault power frequency component is measured, indirectly, under metering system, need to reject by zero-sequence component Sudden Changing Rate method the impact of amount of unbalance.
(2), if break down Xian road in the circuit of monitoring, start insulation early warning calculation procedure, and carry out next step; Otherwise return to (1);
Research shows really to exist transient fault in power circuit, and can carry out according to the situation of the generation of transient fault the insulation status of Monitoring Line.Insulation warning algorithm of the present invention is as follows: the failure messages such as the number of times, duration, intensity of transient fault occur in record trouble circuit, calculate the corresponding insulating coefficient of number of times, duration, intensity of transient fault and the insulating coefficient of whole piece circuit occur respectively, finally determine whether by the insulating coefficient of whole piece circuit the early warning of insulating.
(3) carry out failure line selection record trouble information;
(4) setting valve of setting line insulation coefficient
Early warning system insulating coefficient is set to two-stage setting valve C
1, C
2(C
1<C
2), as line insulation coefficient 0≤ξ≤C
1time, the insulation of circuit has slight damage; As line insulation coefficient C
1≤ ξ≤C
2time, the insulation of circuit is subject to damage to a certain extent; As line insulation coefficient ξ>=C
2time, line insulation is subject to badly damaged.
(5) insulating coefficient of computational scheme;
In the time there is transient fault in circuit, by line selection apparatus route selection and carry out the storage of field failure data, fault data in unit interval T is passed to industrial computer through data transmission channel, carry out the calculating of line insulation coefficient by the calculation procedure of insulating coefficient in industrial computer, computation process is as follows:
According to early warning system, the testing result of circuit is calculated the insulation early warning coefficient ξ of whole piece circuit,
ξ=aα+bβ+cγ
In formula, α, β, γ are respectively the corresponding insulation early warning of number of times, duration and the intensity coefficient of circuit generation transient fault in regular hour T; A, b, c are respectively corresponding weight coefficient.
In regular hour T, the corresponding insulation early warning of number of times, duration and intensity factor alpha, β, the γ of circuit generation transient fault are respectively:
In formula, N is the insulation early warning transient fault number of times of expecting; N is the number of times of power circuit generation transient fault in unit interval T; t
ikfor the duration of the each transient fault of circuit in unit interval T; D is the threshold of determining permanent fault; u
ikfor the voltage strength of circuit generation transient fault in unit interval T, U is the voltage peak of metallicity fault; R, s, m are corresponding coefficient.
(6), by the threshold value contrast of the insulating coefficient of power circuit and early warning, judge whether to meet the condition of early warning of insulating;
As line insulation coefficient 0≤ξ≤C
1time, the early warning of needn't insulating; As line insulation coefficient C
1≤ ξ≤C
2time, send insulation early warning signal and report early warning information, the less time of Influence of production is being carried out to interruption maintenance; As line insulation coefficient ξ>=C
2time, the early warning system that need to insulate is sent early warning signal immediately, and interruption maintenance immediately.
(7) send insulation early warning signal, report early warning information and take appropriate measures according to the insulation damages situation of circuit.
When the insulating coefficient of circuit meets insulation when early-warning conditions, send acousto-optic early warning signal by insulation early warning system, necessary words automatic trip or by field operator's hand trip(ping), carries out interruption maintenance, prevents the expansion of fault, improves the power supply reliability of system.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (3)
1. an insulated monitoring method for the power circuit based on transient fault, is characterized in that comprising the following steps: step S01: power circuit is carried out to on-line monitoring;
Step S02: if break down Xian road in the circuit of monitoring, start insulation early warning calculation procedure, and carry out next step; Otherwise return to step S01;
Step S03: carry out failure line selection record trouble information;
Step S04: the setting valve of setting line insulation coefficient;
Early warning system insulating coefficient is set to two-stage setting valve C
1, C
2, wherein C
1<C
2, as line insulation coefficient 0≤ξ≤C
1time, the insulation of circuit has slight damage; As line insulation coefficient C
1≤ ξ≤C
2time, the insulation of circuit is subject to damage to a certain extent; As line insulation coefficient ξ>=C
2time, line insulation is subject to badly damaged;
Step S05: the number of stoppages, duration, intensity failure message that read failure circuit occurs in unit interval T;
Step S06: the insulating coefficient of computational scheme;
According to early warning system, the monitoring result of circuit is calculated the insulation early warning coefficient ξ of whole piece circuit,
ξ=aα+bβ+cγ
In formula, α, β, γ are respectively the corresponding insulation early warning of number of times, duration and the intensity coefficient of circuit generation transient fault in regular hour T; A, b, c are respectively corresponding weight coefficient;
In regular hour T, the corresponding insulation early warning of number of times, duration and intensity factor alpha, β, the γ of circuit generation transient fault are respectively:
In formula, N is the insulation early warning transient fault number of times of expecting; N is the number of times of power circuit generation transient fault in unit interval T; t
ikfor the duration of the each transient fault of circuit in unit interval T; D is the threshold of determining permanent fault; u
ikfor the voltage strength of circuit generation transient fault in unit interval T, U is the voltage peak of metallicity fault; R, s, m are corresponding coefficient;
Step S07: by the threshold value contrast of insulating coefficient and early warning, judge whether to meet the condition of early warning of insulating;
Step S08: send insulation early warning signal, report early warning information and take appropriate measures according to the insulation damages situation of circuit.
2. the insulated monitoring method of the power circuit based on transient fault according to claim 1, is characterized in that: described condition comprises: as line insulation coefficient 0≤ξ≤C
1time, the early warning of needn't insulating; As line insulation coefficient C
1≤ ξ≤C
2time, send insulation early warning signal and report early warning information, carry out interruption maintenance in the time that is less than a predetermined impact on producing; As line insulation coefficient ξ>=C
2time, the early warning system that need to insulate is sent early warning signal immediately, and interruption maintenance immediately.
3. the insulated monitoring method of the power circuit based on transient fault according to claim 1, is characterized in that: described measure comprises: as line insulation coefficient 0≤ξ≤C
1time, needn't interruption maintenance; As line insulation coefficient C
1≤ ξ≤C
2time, carry out interruption maintenance in the time that is less than a predetermined impact on producing; As line insulation coefficient ξ>=C
2time, need interruption maintenance immediately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410125670.6A CN103954887A (en) | 2014-03-31 | 2014-03-31 | Power line insulation monitoring method based on instant fault |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410125670.6A CN103954887A (en) | 2014-03-31 | 2014-03-31 | Power line insulation monitoring method based on instant fault |
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|---|---|
| CN103954887A true CN103954887A (en) | 2014-07-30 |
Family
ID=51332185
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|---|---|---|---|
| CN201410125670.6A Pending CN103954887A (en) | 2014-03-31 | 2014-03-31 | Power line insulation monitoring method based on instant fault |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107808202A (en) * | 2017-10-27 | 2018-03-16 | 国家电网公司 | Electrical equipment fault judges guidance method and terminal device |
| CN109596948A (en) * | 2018-12-10 | 2019-04-09 | 国网山东省电力公司电力科学研究院 | A kind of distribution line state of insulation evaluation method |
| CN112230100A (en) * | 2020-09-29 | 2021-01-15 | 山东大学 | Slow-development permanent fault early warning method and system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112230100A (en) * | 2020-09-29 | 2021-01-15 | 山东大学 | Slow-development permanent fault early warning method and system |
| CN112230100B (en) * | 2020-09-29 | 2022-01-11 | 山东大学 | Slow-development permanent fault early warning method and system |
| WO2022068074A1 (en) * | 2020-09-29 | 2022-04-07 | 山东大学 | Early warning method and system for slowly developing permanent fault |
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Application publication date: 20140730 |
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