CN113866580A - Method and system for evaluating insulation damage probability of low-voltage direct-current system equipment - Google Patents
Method and system for evaluating insulation damage probability of low-voltage direct-current system equipment Download PDFInfo
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- CN113866580A CN113866580A CN202111403658.3A CN202111403658A CN113866580A CN 113866580 A CN113866580 A CN 113866580A CN 202111403658 A CN202111403658 A CN 202111403658A CN 113866580 A CN113866580 A CN 113866580A
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- 238000011158 quantitative evaluation Methods 0.000 abstract description 15
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- 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
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Abstract
The invention discloses a method and a system for evaluating the insulation damage probability of low-voltage direct current system equipment, which utilize insulation monitors to monitor the insulation damage of the equipment of a low-voltage direct current power supply system, record the alarm time length of each insulation monitor, calculate the equipment insulation damage probability of the low-voltage direct current power supply system according to the ratio of the alarm time length to the total monitoring time length, therefore, the equipment insulation damage probability of the low-voltage direct-current power supply system is calculated according to the actual monitoring data, the equipment insulation damage probability is not dependent on the empirical parameters of the equipment insulation damage probability, the accuracy is higher, the reliability of the safety risk quantitative evaluation result of the low-voltage direct-current system is improved, the problem that when the safety risk quantitative evaluation is carried out on the low-voltage direct-current power supply system equipment in the prior art is solved, only the experience parameters of the equipment insulation damage probability can be used, the accuracy is low, and the reliability of the safety risk quantitative evaluation result is low.
Description
Technical Field
The invention relates to the technical field of low-voltage direct-current power supply systems, in particular to a method and a system for evaluating insulation damage probability of low-voltage direct-current system equipment.
Background
With the development of power electronic technology and the continuous access of new energy, Low Voltage Direct Current (LVDC) power supply systems are increasingly widely used in the field of civil power supply due to the characteristics of safety, reliability, economy and the like. When the accident occurrence probability of the low-voltage direct-current power supply system is quantified, one of the parameters which need to be considered most is the insulation damage probability of the equipment, however, at present, when the safety risk quantification evaluation is performed on the low-voltage direct-current power supply system equipment, only the empirical parameters of the insulation damage probability of the equipment can be used, the accuracy is low, and the reliability of the safety risk quantification evaluation result is low. Therefore, it is necessary to improve the accuracy of the insulation damage probability of the low-voltage dc power supply system device so as to improve the reliability of the safety risk quantitative evaluation result of the low-voltage dc power supply system.
Disclosure of Invention
The invention provides a method and a system for evaluating the insulation damage probability of low-voltage direct-current system equipment, which are used for solving the technical problem that the reliability of a safety risk quantitative evaluation result is low because only empirical parameters of the insulation damage probability of the equipment can be used when safety risk quantitative evaluation is carried out on low-voltage direct-current power supply system equipment in the prior art, and the accuracy is low.
In view of the above, a first aspect of the present invention provides a method for evaluating insulation damage probability of a low-voltage dc system device, including:
selecting n devices for outgoing lines of the same power bus in a low-voltage direct-current power supply system, and arranging m insulation monitors between the power bus and the n devices, wherein the m insulation monitors are respectively used for carrying out insulation monitoring on the n devices;
acquiring the alarm time length of each insulation monitor which generates insulation damage alarm within preset monitoring time;
Optionally, the preset monitoring time T is 8760 h.
Optionally, the alarm duration of the insulation monitor is a superposition of single alarm durations, and the single alarm duration is a difference between start and stop times of the alarm signal.
The second aspect of the present invention provides an insulation damage probability evaluation system for low-voltage dc system equipment, including:
the system comprises a platform building unit, a low-voltage direct-current power supply system and a monitoring unit, wherein the platform building unit is used for selecting n devices with the same power bus outgoing line in the low-voltage direct-current power supply system, and m insulation monitors are arranged between the power bus and the n devices, wherein the m insulation monitors are respectively used for carrying out insulation monitoring on the n devices;
the alarm duration acquiring unit is used for acquiring the alarm duration of each insulation monitor which generates the insulation damage alarm within the preset monitoring time;
the damage probability calculation module is used for calculating the equipment insulation damage probability of the low-voltage direct-current power supply system according to a preset equipment insulation damage probability calculation formula, wherein the preset equipment insulation damage probability calculation formula is as follows:
t is a preset monitoring time TiAlarm duration, p, for occurrence of insulation breakage alarm of ith insulation monitor1The probability of damage to the insulation of the equipment of the low-voltage DC power supply system.
Optionally, the preset monitoring time T is 8760 h.
Optionally, the alarm duration of the insulation monitor is a superposition of single alarm durations, and the single alarm duration is a difference between start and stop times of the alarm signal.
According to the technical scheme, the method for evaluating the insulation damage probability of the low-voltage direct-current system equipment has the following advantages:
the invention provides a method for evaluating the insulation damage probability of low-voltage direct current system equipment, which utilizes insulation monitors to monitor the insulation damage of the equipment of a low-voltage direct current power supply system, records the alarm time length of each insulation monitor, calculates the equipment insulation damage probability of the low-voltage direct current power supply system according to the proportion of the alarm time length to the total monitoring time length, therefore, the equipment insulation damage probability of the low-voltage direct-current power supply system is calculated according to the actual monitoring data, the equipment insulation damage probability is not dependent on the empirical parameters of the equipment insulation damage probability, the accuracy is higher, the reliability of the safety risk quantitative evaluation result of the low-voltage direct-current system is improved, the problem that when the safety risk quantitative evaluation is carried out on the low-voltage direct-current power supply system equipment in the prior art is solved, only the experience parameters of the equipment insulation damage probability can be used, the accuracy is low, and the reliability of the safety risk quantitative evaluation result is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for evaluating insulation damage probability of low-voltage dc system equipment according to the present invention;
FIG. 2 is a schematic structural diagram of m insulation monitors arranged between a power bus and n devices according to the present invention;
fig. 3 is a schematic structural diagram of an insulation damage probability evaluation system for a low voltage dc system device according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
For easy understanding, referring to fig. 1, an embodiment of a method for estimating an insulation breakdown probability of a low-voltage dc system device according to the present invention includes:
As shown in fig. 2, in the embodiment of the present invention, n devices for outputting the same power bus are selected in the low-voltage dc power supply system, m insulation monitors are arranged between the power bus and the n devices, and the correspondence between the n devices and the m insulation monitors may be one-to-one or one-to-many, and may be specifically set according to an actual application scenario.
102, acquiring the alarm time length of each insulation monitor generating insulation damage alarm in the preset monitoring time.
The method comprises the following steps of recording the alarm time of each insulation monitor in preset monitoring time T, wherein the alarm time of each insulation monitor is the superposition of the alarm time of a single alarm, and the alarm time of the single alarm of each insulation monitor is the difference of the starting time and the stopping time of an alarm signal (namely the time from the insulation damage of equipment to the insulation damage repair is long, after the insulation damage of the equipment occurs, the insulation monitor can immediately give an alarm, and then the alarm can be stopped after the insulation damage is repaired, of course, in order to avoid the long-time non-repair of the insulation damage, the limit value of the alarm time can be set to be 2 h).
103, calculating the equipment insulation damage probability of the low-voltage direct current power supply system according to a preset equipment insulation damage probability calculation formula, wherein the preset equipment insulation damage probability calculation formula is as follows:
t is preset monitoringTime, tiAlarm duration, p, for occurrence of insulation breakage alarm of ith insulation monitor1The probability of damage to the insulation of the equipment of the low-voltage DC power supply system.
The preset monitoring time T is optimally selected from one year (8760h), the equipment insulation damage is not easy to be found and the alarm is not easy to be given when the time is too short, and the damage probability is difficult to be counted in time when the time is too long. If the preset monitoring time T is 8760h, the following steps are carried out:
the invention provides a method for evaluating the insulation damage probability of low-voltage direct current system equipment, which utilizes insulation monitors to monitor the insulation damage of the equipment of a low-voltage direct current power supply system, records the alarm time length of each insulation monitor, calculates the equipment insulation damage probability of the low-voltage direct current power supply system according to the proportion of the alarm time length to the total monitoring time length, therefore, the equipment insulation damage probability of the low-voltage direct-current power supply system is calculated according to the actual monitoring data, the equipment insulation damage probability is not dependent on the empirical parameters of the equipment insulation damage probability, the accuracy is higher, the reliability of the safety risk quantitative evaluation result of the low-voltage direct-current system is improved, the problem that when the safety risk quantitative evaluation is carried out on the low-voltage direct-current power supply system equipment in the prior art is solved, only the experience parameters of the equipment insulation damage probability can be used, the accuracy is low, and the reliability of the safety risk quantitative evaluation result is low.
For easy understanding, please refer to fig. 3, an embodiment of the system for estimating the insulation breakdown probability of the low voltage dc system device according to the present invention further includes:
the platform building unit 301 is used for selecting n pieces of equipment with the same power bus outgoing line in the low-voltage direct-current power supply system, and m insulation monitors are arranged between the power bus and the n pieces of equipment, wherein the m insulation monitors are respectively used for carrying out insulation monitoring on the n pieces of equipment;
an alarm duration obtaining unit 302, configured to obtain an alarm duration of each insulation monitor that generates an insulation damage alarm within a preset monitoring time;
a damage probability calculation module 303, configured to calculate an equipment insulation damage probability of the low-voltage dc power supply system according to a preset equipment insulation damage probability calculation formula, where the preset equipment insulation damage probability calculation formula is:
t is a preset monitoring time TiAlarm duration, p, for occurrence of insulation breakage alarm of ith insulation monitor1The probability of damage to the insulation of the equipment of the low-voltage DC power supply system.
The preset monitoring time T is 8760 h.
The alarm duration of the insulation monitor is the superposition of the single alarm duration, and the single alarm duration is the difference between the start time and the stop time of the alarm signal.
The invention provides an insulation damage probability evaluation system of low-voltage direct current system equipment, which utilizes insulation monitors to monitor the insulation damage of the equipment of a low-voltage direct current power supply system, records the alarm time length of each insulation monitor, calculates the equipment insulation damage probability of the low-voltage direct current power supply system according to the proportion of the alarm time length to the total monitoring time length, therefore, the equipment insulation damage probability of the low-voltage direct-current power supply system is calculated according to the actual monitoring data, the equipment insulation damage probability is not dependent on the empirical parameters of the equipment insulation damage probability, the accuracy is higher, the reliability of the safety risk quantitative evaluation result of the low-voltage direct-current system is improved, the problem that when the safety risk quantitative evaluation is carried out on the low-voltage direct-current power supply system equipment in the prior art is solved, only the experience parameters of the equipment insulation damage probability can be used, the accuracy is low, and the reliability of the safety risk quantitative evaluation result is low.
The insulation damage probability evaluation system for low-voltage dc system devices provided in the embodiments of the present invention is configured to execute the insulation damage probability evaluation method for low-voltage dc system devices in the foregoing embodiments, and the principle of the insulation damage probability evaluation system is consistent with the working principle of the insulation damage probability evaluation method for low-voltage dc system devices in the foregoing embodiments, and details thereof are not repeated here.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for evaluating the insulation damage probability of low-voltage direct-current system equipment is characterized by comprising the following steps:
selecting n devices for outgoing lines of the same power bus in a low-voltage direct-current power supply system, and arranging m insulation monitors between the power bus and the n devices, wherein the m insulation monitors are respectively used for carrying out insulation monitoring on the n devices;
acquiring the alarm time length of each insulation monitor which generates insulation damage alarm within preset monitoring time;
calculating the equipment insulation damage probability of the low-voltage direct-current power supply system according to a preset equipment insulation damage probability calculation formula, wherein the preset equipment insulation damage probability calculation formula is as follows:
t is a preset monitoring time TiAlarm duration, p, for occurrence of insulation breakage alarm of ith insulation monitor1The probability of damage to the insulation of the equipment of the low-voltage DC power supply system.
2. The method for estimating the insulation breakage probability of the low-voltage direct-current system equipment according to claim 1, wherein the preset monitoring time T is 8760 h.
3. The method according to claim 1, wherein the alarm duration of the insulation monitor is a superposition of single alarm durations, and the single alarm duration is a difference between start and stop times of the alarm signal.
4. The utility model provides a low pressure direct current system equipment insulation breakage probability evaluation system which characterized in that includes:
the system comprises a platform building unit, a low-voltage direct-current power supply system and a monitoring unit, wherein the platform building unit is used for selecting n devices with the same power bus outgoing line in the low-voltage direct-current power supply system, and m insulation monitors are arranged between the power bus and the n devices, wherein the m insulation monitors are respectively used for carrying out insulation monitoring on the n devices;
the alarm duration acquiring unit is used for acquiring the alarm duration of each insulation monitor which generates the insulation damage alarm within the preset monitoring time;
the damage probability calculation module is used for calculating the equipment insulation damage probability of the low-voltage direct-current power supply system according to a preset equipment insulation damage probability calculation formula, wherein the preset equipment insulation damage probability calculation formula is as follows:
t is a preset monitoring time TiAlarm duration, p, for occurrence of insulation breakage alarm of ith insulation monitor1The probability of damage to the insulation of the equipment of the low-voltage DC power supply system.
5. The system for estimating the insulation breakage probability of low-voltage direct-current system equipment according to claim 4, wherein the preset monitoring time T is 8760 h.
6. The system according to claim 4, wherein the alarm duration of the insulation monitor is a superposition of single alarm durations, and the single alarm duration is a difference between start and stop times of the alarm signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111403658.3A CN113866580A (en) | 2021-11-22 | 2021-11-22 | Method and system for evaluating insulation damage probability of low-voltage direct-current system equipment |
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| CN202111403658.3A CN113866580A (en) | 2021-11-22 | 2021-11-22 | Method and system for evaluating insulation damage probability of low-voltage direct-current system equipment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038262A (en) * | 2007-04-03 | 2007-09-19 | 西安交通大学 | Device and method for online monitoring power supply system external Insulation filthy status |
| CN105676077A (en) * | 2014-11-18 | 2016-06-15 | 北京兴迪仪器有限责任公司 | High-voltage cable partial discharge on-line monitoring alarm method, device and system |
| US20170315205A1 (en) * | 2016-04-27 | 2017-11-02 | Bender Gmbh & Co. Kg | Methods and devices for testing the function of an insulation monitoring device |
| CN111209535A (en) * | 2019-12-25 | 2020-05-29 | 国家电网公司西北分部 | Power equipment successive fault risk identification method and system |
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2021
- 2021-11-22 CN CN202111403658.3A patent/CN113866580A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038262A (en) * | 2007-04-03 | 2007-09-19 | 西安交通大学 | Device and method for online monitoring power supply system external Insulation filthy status |
| CN105676077A (en) * | 2014-11-18 | 2016-06-15 | 北京兴迪仪器有限责任公司 | High-voltage cable partial discharge on-line monitoring alarm method, device and system |
| US20170315205A1 (en) * | 2016-04-27 | 2017-11-02 | Bender Gmbh & Co. Kg | Methods and devices for testing the function of an insulation monitoring device |
| CN111209535A (en) * | 2019-12-25 | 2020-05-29 | 国家电网公司西北分部 | Power equipment successive fault risk identification method and system |
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