CN113032946A - Evaluation method and system of power distribution network single-phase fault processing technology based on safety protection - Google Patents
Evaluation method and system of power distribution network single-phase fault processing technology based on safety protection Download PDFInfo
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Abstract
The invention provides a method and a system for evaluating a power distribution network single-phase fault processing technology based on safety protection, wherein the method comprises the following steps: constructing a risk probability model corresponding to each measure for single-phase fault treatment of the power distribution network; constructing a power distribution network scale grade risk hazard value model; constructing a power distribution network single-phase fault processing risk evaluation model; and obtaining a corresponding risk probability total value and a risk hazard value based on the actual processing technical condition of the single-phase fault of the power distribution network, and comparing the product value of the risk probability total value and the risk hazard value with an evaluation reference critical value in a power distribution network single-phase fault processing risk evaluation model to obtain corresponding evaluation content. The method provides a power distribution network single-phase earth fault processing evaluation model, works out evaluation indexes and design grading threshold values, provides quantitative indexes and instructions for personal safety risks of various power distribution networks in power supply enterprises, improves the capability of the power distribution networks in pre-controlling the personal safety risks, and reduces casualties and property loss.
Description
Technical Field
The invention belongs to the field of power distribution network fault processing, and particularly relates to an evaluation method and system of a power distribution network single-phase fault processing technology based on safety protection.
Background
The accidents of personal electric shock injury caused by single-phase faults of the power distribution network occur all over the country, and the personal safety hidden danger is large. The distribution network has a complex structure and a variable environment, is directly deep into a user terminal, is easy to cause single-phase faults and brings malignant electric shock accidents, and personal electric shock injury accidents caused by the single-phase faults of the distribution network occur all over the country (see literature 1: Xupropan whole boundless, Litianyou, Xue Yong Ends. distribution network electric shock protection and neutral point grounding mode [ J ]. power supply and utilization, 2017,34(05): 21-26). Meanwhile, the electric shock accident has the characteristics of large burst and high human casualty rate. The human body is a conductor and consists of 12 basic elements such as carbon, hydrogen, oxygen, nitrogen and the like and some trace elements. Water in human tissue accounts for about 60% of body weight. In addition to water, salts, protein molecules, and the like exist in the body in an ionic state. When current passes through a human body, electric energy is converted into heat energy and acts on the human body, so that the human body is injured, the injury often occurs between moments, and the defense capability is rapidly reduced once the human body is injured, so that the prevention is particularly important (see document 2: jade; human body current effect [ J ]. health and professional education, 2011,29(04): 158-. The number of people died due to electric shock in China is thousands of people every year, and the number of serious injury accidents of people caused by the problem of electric power safety is extremely large. In addition, if the fault cannot be processed quickly in time, the earth fault is easy to generate arc overvoltage, so that the equipment is burnt, and even a fire burning continuous operation accident is caused (see document 3: Xiaobai, Shuhongchun, peak. Single-phase earth fault line selection method of a low-current earth system for review [ J ]. Relay, 2001(04): 16-20). The power supply reliability is reduced by the earth fault tripping and power failure, and the earth fault tripping and power failure directly relate to the industrial production and the people living standard. The existing power distribution network fault processing method adopts various fault judgment bases, but has few research on constraint indexes from the perspective of personal safety.
At present, various index criteria for fault treatment exist in a power distribution network, but a safety protection-based power distribution network single-phase earth fault treatment technology constraint index and evaluation method are lacked, production cannot be guided clearly, and personal casualties and property loss are reduced. For the distribution network ground fault, the traditional power system operation mode mainly considers the power supply reliability, and the system is allowed to operate for 2 hours at most with the ground fault. The latest national grid "distribution network technical guideline" proposes that the fault should be removed after the earth fault is 10s, already considers the influence of the earth fault on the personal and system safety, but does not propose further measures for increasing the personal safety. The existing fault processing technology can not rapidly process all fault types, particularly high-resistance grounding and single-phase disconnection which are difficult to detect, and fault processing indexes aiming at personal safety are not provided. Meanwhile, research work related to a power distribution network fault rapid processing technology evaluation method is not developed in China, theoretical support for selecting related processing technologies in practical application is lacked, and operation and maintenance of a power distribution network cannot be guided more effectively.
Disclosure of Invention
The invention provides an evaluation method and an evaluation system of a single-phase fault processing technology of a power distribution network based on safety protection, so that the problems that the power distribution network lacks a power distribution network single-phase earth fault processing technology constraint index and an evaluation method based on safety protection, electric shock accidents are easily caused, and personal equipment safety is endangered are solved; the evaluation system established by the method is utilized to accurately evaluate the fault treatment, effectively guide the single fault treatment of the power distribution network, improve the personal safety protection level and reduce the personal and equipment potential safety hazards caused by the single-phase fault of the power distribution network.
A method for evaluating a power distribution network single-phase fault processing technology based on safety protection comprises the following steps:
constructing a risk probability model corresponding to each measure for single-phase fault treatment of the power distribution network;
based on expert experience, dividing specific content intervals of the single-phase fault processing indexes of the power distribution network, and setting corresponding risk probability values to obtain a risk probability model;
the single-phase fault processing indexes of the power distribution network comprise device action time, fault processing time, fault point residual voltage, highest running phase voltage of equipment, power supply reliability and direct economic loss and compensation device cost in power failure;
constructing a power distribution network scale grade risk hazard value model;
based on expert experience, dividing power supply areas according to load density of the power supply areas or administrative areas to which the power supply areas belong to obtain power distribution network scale grades corresponding to the power supply areas, setting power failure hazard severity scores and obtaining a power distribution network scale grade risk hazard value model;
constructing a power distribution network single-phase fault processing risk evaluation model;
obtaining an evaluation reference critical value of each grade according to the product of a risk probability reference value given by expert experience and the outage hazard severity degree score of each power distribution network scale grade in the power distribution network scale grade risk value model, and obtaining corresponding evaluation content by combining the expert experience to obtain a power distribution network single-phase fault processing risk evaluation model;
based on the actual processing technical condition of the single-phase fault of the power distribution network, calling the risk probability model and the risk hazard value model respectively to obtain a corresponding risk probability total value and a corresponding risk hazard value, and comparing the product value of the risk probability total value and the risk hazard value with an evaluation reference value in the single-phase fault processing risk evaluation model of the power distribution network to obtain corresponding evaluation content.
Further, the risk probability model is specifically as follows:
the total risk probability value refers to a product value of risk probabilities corresponding to the fault processing indexes.
Further, the model of the risk value of the scale grade of the power distribution network is specifically as follows:
| scale rating of distribution network | Basis of division | Severity of outage hazard | Score value |
| A | The central area or a is more than or equal to 30 | Damage of extra large degree | 100 |
| B | A is more than or equal to 15 and less than 30 in urban areas | Damage of great extent | 50 |
| C | Town or 1 is more than or equal to a and less than 6 | General degree of damage | 30 |
| D | In rural areas or a is more than or equal to 0.1 and less than 1 | Less harmful | 15 |
| E | Farming and pasturing area | Slight harm to | 10 |
Wherein a is the load density (MW/km) of the power supply region2) And the area of the power supply area is not less than 5km2。
When calculating the load density, the 110(66) kV special line load and the invalid power supply areas of mountains, gobi, deserts, water areas, forests and the like are deducted.
Further, the risk probability reference value is 60.
Further, the power distribution network single-phase fault processing risk evaluation model specifically comprises the following steps:
1) total risk value > 6000: considering giving up, stopping power supply and modifying the I-level risk and the difference;
2)3000 < total risk value not more than 6000: level II risks are worse, and correction and modification measures need to be taken;
3) the total risk value is more than 1800 and less than or equal to 3000: class iii risk, generally, modifications can be considered to achieve better personal safety index and economic benefit;
4) the total risk value is more than 900 and less than or equal to 1800: and the IV-level risk is better, the fault treatment basically can meet the personal safety standard, the equipment safety standard and better economic effect are obtained.
5) The total risk value is less than or equal to 900: the risk of V grade is excellent, the fault processing accords with the personal safety standard, the equipment safety standard and obtains good economic effect.
An evaluation system of a single-phase fault processing technology of a power distribution network based on safety protection comprises the following steps:
a risk probability model corresponding to each measure of single-phase fault processing of the power distribution network;
based on expert experience, dividing specific content intervals of the single-phase fault processing indexes of the power distribution network, and setting corresponding risk probability values to obtain a risk probability model;
a power distribution network scale grade risk hazard value model;
based on expert experience, dividing power supply areas according to load density of the power supply areas or administrative areas to which the power supply areas belong to obtain power distribution network scale grades corresponding to the power supply areas, setting power failure hazard severity scores and obtaining a power distribution network scale grade risk hazard value model;
a power distribution network single-phase fault processing risk evaluation model;
obtaining an evaluation reference critical value of each grade according to the product of a risk probability reference value given by expert experience and the outage hazard severity degree score of each power distribution network scale grade in the power distribution network scale grade risk value model, and obtaining corresponding evaluation content by combining the expert experience to obtain a power distribution network single-phase fault processing risk evaluation model;
and the real-time evaluation model is used for respectively calling the risk probability model and the risk hazard value model based on the actual processing technical condition of the single-phase fault of the power distribution network to obtain a corresponding risk probability total value and a corresponding risk hazard value, and comparing the product value of the risk probability total value and the risk hazard value with an evaluation reference critical value in the power distribution network single-phase fault processing risk evaluation model to obtain corresponding evaluation content.
Further, the power distribution network single-phase fault processing risk evaluation model comprises:
1) total risk value > 6000: considering giving up, stopping power supply and modifying the I-level risk and the difference;
2)3000 < total risk value not more than 6000: level II risks are worse, and correction and modification measures need to be taken;
3) the total risk value is more than 1800 and less than or equal to 3000: class iii risk, generally, modifications can be considered to achieve better personal safety index and economic benefit;
4) the total risk value is more than 900 and less than or equal to 1800: and the IV-level risk is better, the fault treatment basically can meet the personal safety standard, the equipment safety standard and better economic effect are obtained.
5) The total risk value is less than or equal to 900: the risk of V grade is excellent, the fault processing accords with the personal safety standard, the equipment safety standard and obtains good economic effect.
Advantageous effects
Compared with the prior art, the invention has the following advantages:
(1) according to the method, personal risks and equipment risks in the power distribution network are identified, a power distribution network single-phase earth fault processing evaluation model and an application method system are provided, evaluation indexes and design grading threshold values are worked out, quantitative indexes and instructions are given for personal safety risks of various power distribution networks in power supply enterprises, the relation between power distribution network single-phase earth fault processing and personal safety is determined to a great extent, powerful references can be provided for newly-built primary and secondary equipment and structural design and operation mode adjustment of the power distribution network during operation, operation risk evaluation results of existing power grid companies are effectively supplemented, the capability of the power distribution network in controlling personal safety risks is improved, and casualties and property losses are reduced.
(2) The method creatively provides a power distribution network single-phase earth fault processing evaluation model, index and method system, realizes real-time quantitative evaluation of various personal safety risks and equipment risks in the power distribution network, belongs to the first example at home and abroad, and can provide advanced guidance for scientific safety management of the power distribution network.
(3) The method can promote the release of more power distribution network single-phase earth fault processing technologies considering safety protection, can better guide production, and has certain engineering significance and social significance.
(4) The method fully considers economic factors such as equipment safety, input-output ratio and the like, is suitable for most power distribution networks, has strong universality and can be widely popularized at home and abroad.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a simulated wiring diagram of a 10KV power distribution network system in a certain town;
FIG. 3 is a diagram of a small-resistance grounding simulation wiring used in a certain town 10KV power distribution network system;
fig. 4 is a grounding simulation wiring diagram of a complete set of devices for rapidly processing single-phase faults of a power distribution network in a certain town 10KV power distribution network system.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, an evaluation method for a single-phase fault processing technology of a power distribution network based on safety protection includes:
constructing a risk probability model corresponding to each measure for single-phase fault treatment of the power distribution network;
based on expert experience, dividing specific content intervals of the single-phase fault processing indexes of the power distribution network, and setting corresponding risk probability values to obtain a risk probability model;
the single-phase fault processing indexes of the power distribution network comprise device action time, fault processing time, fault point residual voltage, highest running phase voltage of equipment, power supply reliability and direct economic loss and compensation device cost in power failure;
TABLE 1 Risk probability model
Constructing a power distribution network scale grade risk hazard value model;
based on expert experience, dividing power supply areas according to load density of the power supply areas or administrative areas to which the power supply areas belong to obtain power distribution network scale grades corresponding to the power supply areas, setting power failure hazard severity scores and obtaining a power distribution network scale grade risk hazard value model;
TABLE 2 model of the risk hazard value of the scale grade of the distribution network
| Scale rating of distribution network | Basis of division | Severity of outage hazard | Score value |
| A | The central area or a is more than or equal to 30 | Damage of extra large degree | 100 |
| B | A is more than or equal to 15 and less than 30 in urban areas | Damage of great extent | 50 |
| C | Town or 1 is more than or equal to a and less than 6 | General degree of damage | 30 |
| D | In rural areas or a is more than or equal to 0.1 and less than 1 | Less harmful | 15 |
| E | Farming and pasturing area | Slight harm to | 10 |
Constructing a power distribution network single-phase fault processing risk evaluation model;
obtaining an evaluation reference critical value of each grade according to the product of a risk probability reference value 60 given by expert experience and the outage hazard severity degree score of each power distribution network scale grade in the power distribution network scale grade risk value model, and obtaining corresponding evaluation content by combining the expert experience to obtain a power distribution network single-phase fault processing risk evaluation model;
based on the actual processing technical condition of the single-phase fault of the power distribution network, calling the risk probability model and the risk hazard value model respectively to obtain a corresponding risk probability total value and a corresponding risk hazard value, and comparing the product value of the risk probability total value and the risk hazard value with an evaluation reference value in the single-phase fault processing risk evaluation model of the power distribution network to obtain corresponding evaluation content.
In order to verify the effectiveness of the safety protection-based power distribution network single-phase earth fault processing and evaluation index system and the evaluation method, a certain town 10KV power distribution network is selected as shown in figure 1, and when a single-phase earth fault is simulated, the parameters of a real power distribution network are simulated by replacing line distribution parameters with centralized parameters such as a capacitor bank and the like.
Setting a certain grounding point according to the figure 2 can simulate a single-phase grounding fault, preparing various types of soil for a fault grounding point to perform a simulation human body error contact wire experiment under different environments, considering the operability of a human body or animal experiment, performing human body simulation according to setting a resistance similar to the resistance change of a human body, and including soil blocks with different humidity in a fault point setting area so as to simulate the correctness of a grounding fault processing technology constraint index under different environments.
(1) When the power distribution network is grounded by using a 10 omega small resistor, a schematic diagram is shown in fig. 3, when a single-phase ground fault occurs, a fault line is cut off immediately, the mode is low in cost and simple in modification, the power distribution network mainly comprises a Z-shaped grounding transformer, a neutral point resistor cabinet, a grounding capacitance current fault recorder and the like, the cost for installing a set of neutral point grounding system is about 35 ten thousand yuan, and the actual measurement condition is shown in table 3.
Table 310 kV power distribution network (capacitance current 65A) unbalanced system by 1k omega test (body resistance 2k omega)
According to the experiment, the risk probability model is contrasted, the device action is 20ms, and the risk probability Pe1 is taken as 1.5; the fault processing time is 80ms, and the risk probability P is takene2Is 3; the residual voltage of a fault point is 5770V, and the risk probability P is takene3Is 5; the highest running phase voltage (multiple of Uxg) of the equipment is 2.03, and the risk probability P is takene4Is 1.5; the power supply reliability is 90%, and the risk probability P is takene5 is 5; the cost of the power failure direct economic loss and compensation device is below ten million RMB, and the risk probability P is takene5Is 1.
Accumulating the risk probability values to obtain a total risk probability value
Pe＝Pe1*Pe2*Pe3*Pe4*Pe5*Pe6＝168.75
The power distribution network is a town, the scale grade of the power distribution network is C, and the risk hazard value P isaAnd taking 30.
Total risk probability value PeAnd risk hazard value PaMultiplying to obtain a total risk value Pf
Pf＝Pe*Pa＝5062.5
Compared with a power distribution network single-phase fault processing risk evaluation model, 3000 < PfAnd the evaluation result is' level II risk, worse, and correction and reconstruction measures are required. "
(2) Complete device for rapidly processing single-phase fault of power distribution network
In the power distribution network fault treatment experiment, a JKDL-550/XH550-201702 power distribution network single-phase fault rapid treatment complete device developed by a certain equipment manufacturer is selected, the equipment is about one million yuan, a schematic diagram is shown in FIG. 4, and the actual measurement condition is shown in Table 4.
Meter 410 kV distribution network (capacitance current 65A) unbalanced system by 1k omega test (body resistance 2k omega)
According to the experiment, the risk probability model is compared, the device action is 20ms, and the risk probability P is takene1Is 1.5; the fault processing time is 100ms, and the risk probability P is takene2Is 3; the residual voltage of a fault point is 3V, and the risk probability P is takene3Is 1; highest running phase voltage (U) of the devicexgMultiple of) is 1.71, the risk probability P is takene4Is 1.2; the power supply reliability is more than 99 percent, and the risk probability P is takene5Is 1; the cost of the power failure direct economic loss and compensation device is ten million RMB-twenty million RMB, and the risk probability P is takene5Is 1.5.
Accumulating the risk probability values to obtain a total risk probability value
Pe＝Pe1*Pe2*Pe3*Pe4*Pe5*Pe6＝8.1
The power distribution network is a town, the scale grade of the power distribution network is C, and the risk hazard value P isaAnd taking 30.
Total risk probability value PeAnd risk hazard value PaMultiplying to obtain a total risk value Pf
Pf＝Pe*Pa＝243
Comparing with the power distribution network single-phase fault processing risk evaluation model, the total risk value PfLess than or equal to 900, excellent evaluation result, fault treatment meeting the personal safety standard, equipment safety standard and good economic effect. "
In conclusion, the scheme can evaluate the single-phase earth fault processing of the power distribution network in real time, workers only need to compare the scheme to perform scoring evaluation on all factors, calculate the risk probability of six indexes and the scale of the power distribution network comprehensively, compare the evaluation model to obtain an evaluation result, evaluate the indexes comprehensively and accurately, evaluate the process simply and easily, clearly see weak links of the single-phase fault processing of the power distribution network and perform corresponding improvement, and expect that the single-phase fault processing can better meet personal safety standards, guarantee equipment safety and obtain good economic effects.
An evaluation system of a single-phase fault processing technology of a power distribution network based on safety protection comprises the following steps:
a risk probability model corresponding to each measure of single-phase fault processing of the power distribution network;
based on expert experience, dividing specific content intervals of the single-phase fault processing indexes of the power distribution network, and setting corresponding risk probability values to obtain a risk probability model;
a power distribution network scale grade risk hazard value model;
based on expert experience, dividing power supply areas according to load density of the power supply areas or administrative areas to which the power supply areas belong to obtain power distribution network scale grades corresponding to the power supply areas, setting power failure hazard severity scores and obtaining a power distribution network scale grade risk hazard value model;
a power distribution network single-phase fault processing risk evaluation model;
obtaining an evaluation reference critical value of each grade according to the product of a risk probability reference value given by expert experience and the outage hazard severity degree score of each power distribution network scale grade in the power distribution network scale grade risk value model, and obtaining corresponding evaluation content by combining the expert experience to obtain a power distribution network single-phase fault processing risk evaluation model;
and the real-time evaluation model is used for respectively calling the risk probability model and the risk hazard value model based on the actual processing technical condition of the single-phase fault of the power distribution network to obtain a corresponding risk probability total value and a corresponding risk hazard value, and comparing the product value of the risk probability total value and the risk hazard value with an evaluation reference value in the power distribution network single-phase fault processing risk evaluation model to obtain corresponding evaluation content.
Further, the power distribution network single-phase fault processing risk evaluation model comprises:
1) total risk value > 6000: considering giving up, stopping power supply and modifying the I-level risk and the difference;
2)3000 < total risk value not more than 6000: level II risks are worse, and correction and modification measures need to be taken;
3) the total risk value is more than 1800 and less than or equal to 3000: class iii risk, generally, modifications can be considered to achieve better personal safety index and economic benefit;
4) the total risk value is more than 900 and less than or equal to 1800: and the IV-level risk is better, the fault treatment basically can meet the personal safety standard, the equipment safety standard and better economic effect are obtained.
5) The total risk value is less than or equal to 900: the risk of V grade is excellent, the fault processing accords with the personal safety standard, the equipment safety standard and obtains good economic effect.
It should be understood that the functional unit modules in the embodiments of the present invention may be integrated into one processing unit, or each unit module may exist alone physically, or two or more unit modules are integrated into one unit module, and may be implemented in the form of hardware or software.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (7)
1. A method for evaluating a power distribution network single-phase fault processing technology based on safety protection is characterized by comprising the following steps:
constructing a risk probability model corresponding to each measure for single-phase fault treatment of the power distribution network;
based on expert experience, dividing specific content intervals of the single-phase fault processing indexes of the power distribution network, and setting corresponding risk probability values to obtain a risk probability model;
constructing a power distribution network scale grade risk hazard value model;
based on expert experience, dividing power supply areas according to load density of the power supply areas or administrative areas to which the power supply areas belong to obtain power distribution network scale grades corresponding to the power supply areas, setting power failure hazard severity scores and obtaining a power distribution network scale grade risk hazard value model;
constructing a power distribution network single-phase fault processing risk evaluation model;
obtaining an evaluation reference critical value of each grade according to the product of a risk probability reference value given by expert experience and the outage hazard severity degree score of each power distribution network scale grade in the power distribution network scale grade risk value model, and obtaining corresponding evaluation content by combining the expert experience to obtain a power distribution network single-phase fault processing risk evaluation model;
based on the actual processing technical condition of the single-phase fault of the power distribution network, calling the risk probability model and the risk hazard value model respectively to obtain a corresponding risk probability total value and a corresponding risk hazard value, and comparing the product value of the risk probability total value and the risk hazard value with an evaluation reference value in the single-phase fault processing risk evaluation model of the power distribution network to obtain corresponding evaluation content.
2. The method according to claim 1, wherein the risk probability model is specifically as follows:
the total risk probability value refers to a product value of risk probabilities corresponding to the fault processing indexes.
3. The method according to claim 1, wherein the power distribution network scale risk hazard value model is specifically as follows:
Wherein a is the load density (MW/km) of the power supply region2) And the area of the power supply area is not less than 5km2。
4. The method of claim 1, wherein the risk probability baseline value is 60.
5. The method according to claim 2, wherein the power distribution network single-phase fault handling risk evaluation model is specifically as follows:
1) total risk value > 6000: considering giving up, stopping power supply and modifying the I-level risk and the difference;
2)3000 < total risk value not more than 6000: level II risks are worse, and correction and modification measures need to be taken;
3) the total risk value is more than 1800 and less than or equal to 3000: class iii risk, generally, modifications can be considered to achieve better personal safety index and economic benefit;
4) the total risk value is more than 900 and less than or equal to 1800: and the IV-level risk is better, the fault treatment basically can meet the personal safety standard, the equipment safety standard and better economic effect are obtained.
5) The total risk value is less than or equal to 900: the risk of V grade is excellent, the fault processing accords with the personal safety standard, the equipment safety standard and obtains good economic effect.
6. The utility model provides an evaluation system of distribution network single-phase fault processing technique based on safety protection which characterized in that includes:
a risk probability model corresponding to each measure of single-phase fault processing of the power distribution network;
based on expert experience, dividing specific content intervals of the single-phase fault processing indexes of the power distribution network, and setting corresponding risk probability values to obtain a risk probability model;
a power distribution network scale grade risk hazard value model;
based on expert experience, dividing power supply areas according to load density of the power supply areas or administrative areas to which the power supply areas belong to obtain power distribution network scale grades corresponding to the power supply areas, setting power failure hazard severity scores and obtaining a power distribution network scale grade risk hazard value model;
a power distribution network single-phase fault processing risk evaluation model;
obtaining an evaluation reference critical value of each grade according to the product of a risk probability reference value given by expert experience and the outage hazard severity degree score of each power distribution network scale grade in the power distribution network scale grade risk value model, and obtaining corresponding evaluation content by combining the expert experience to obtain a power distribution network single-phase fault processing risk evaluation model;
and the real-time evaluation model is used for respectively calling the risk probability model and the risk hazard value model based on the actual processing technical condition of the single-phase fault of the power distribution network to obtain a corresponding risk probability total value and a corresponding risk hazard value, and comparing the product value of the risk probability total value and the risk hazard value with an evaluation reference value in the power distribution network single-phase fault processing risk evaluation model to obtain corresponding evaluation content.
7. The system of claim 6, wherein the power distribution network single-phase fault handling risk assessment model comprises:
1) total risk value > 6000: considering giving up, stopping power supply and modifying the I-level risk and the difference;
2)3000 < total risk value not more than 6000: level II risks are worse, and correction and modification measures need to be taken;
3) the total risk value is more than 1800 and less than or equal to 3000: class iii risk, generally, modifications can be considered to achieve better personal safety index and economic benefit;
4) the total risk value is more than 900 and less than or equal to 1800: and the IV-level risk is better, the fault treatment basically can meet the personal safety standard, the equipment safety standard and better economic effect are obtained.
5) The total risk value is less than or equal to 900: the risk of V grade is excellent, the fault processing accords with the personal safety standard, the equipment safety standard and obtains good economic effect.
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