CN107884662B - Electrical line short circuit prediction method - Google Patents
Electrical line short circuit prediction method Download PDFInfo
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- CN107884662B CN107884662B CN201710977371.9A CN201710977371A CN107884662B CN 107884662 B CN107884662 B CN 107884662B CN 201710977371 A CN201710977371 A CN 201710977371A CN 107884662 B CN107884662 B CN 107884662B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention discloses an electric circuit short circuit prediction method, which comprises the following steps: A. monitoring the current value S on the L line of the electric circuit in real time through a current sensor and a controller, wherein the monitoring frequency is 3000 times per second; B. calculating a derivative V and a second derivative a of the current change value per microsecond through a controller; C. comparing the current value S with a preset maximum current value I through a controller, and if S is larger than or equal to I, V is larger than or equal to 30A/mus, and a is larger than or equal to 5A/mus, judging that the electric circuit is in short circuit; D. and if the short circuit of the electric circuit is judged, the relay is disconnected through the controller, and the power-off protection is carried out. According to the electric circuit short circuit prediction method, the current condition on the L line of the electric circuit is monitored in real time, the occurrence of the short circuit condition can be predicted in time, power-off protection is carried out, the occurrence of electric disasters can be effectively avoided, and the property and life safety of people is guaranteed.
Description
Technical Field
The invention relates to a power utilization safety monitoring method, in particular to an electric circuit short circuit prediction method.
Background
Short circuit is one of the main causes of electrical fire, often causing great property loss and personal injury to people. However, the existing electrical control devices, such as air switches and thermal relay protection switches, passively take measures when a short circuit occurs, and although the existing electrical control devices can play a role in protection to a certain extent, the existing electrical control devices cannot fundamentally prevent the occurrence of the short circuit, and the occurrence of electrical safety accidents is still continuous, so that the occurrence of the short circuit can be proved, and therefore, the existing electrical control devices are particularly necessary to timely and effectively predict and prevent and control the short circuit.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an electric circuit short circuit prediction method, which can predict the occurrence of short circuit in time by monitoring the current condition of an electric circuit so as to avoid loss.
In order to solve the technical problems, the invention adopts the following technical scheme:
an electrical line short circuit prediction method comprising the steps of: A. monitoring the current value S on the L line of the electric circuit in real time through a current sensor and a controller, wherein the monitoring frequency is 3000 times per second; B. calculating a derivative V and a second derivative a of the current change value per microsecond through a controller; C. comparing the current value S with a preset maximum current value I through a controller, and if S is larger than or equal to I, V is larger than or equal to 30A/mus, and a is larger than or equal to 5A/mus, judging that the electric circuit is in short circuit; D. and if the short circuit of the electric circuit is judged, the relay is disconnected through the controller, and the power-off protection is carried out. The electric circuit short circuit prediction method monitors the current value on the L line of the electric circuit in real time through the current sensor and the controller, and calculates the derivative and the second derivative of the current value change value, so that the occurrence of the short circuit condition can be predicted in time and power-off protection can be carried out.
Preferably, the current sensor in step a is a hall current sensor.
Preferably, the preset maximum current value I in step C is set according to the condition of the electric equipment on the electric line.
Preferably, if it is determined in step D that the electrical line is short-circuited, the controller starts the alarm to alarm, so as to facilitate timely maintenance.
Preferably, if it is determined that the electrical line is short-circuited in step D, the monitoring information is uploaded to the background server through the communication unit on the controller, so as to facilitate remote monitoring and data storage.
Preferably, the controller is provided with an electric operation recovery switch, and when the electric state is recovered to be normal through manual maintenance, the electric operation can be recovered through the switch.
Compared with the prior art, the electric circuit short circuit prediction method has the beneficial effects that: through the current condition on the real-time supervision electric line L line, can in time predict the emergence of short circuit condition and carry out the power-off protection, can effectively avoid the emergence of electric disaster, guarantee people's property and life safety.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a method for predicting short circuit of an electrical circuit according to the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1, the method for predicting short circuit of electrical line of the present invention comprises the following steps: A. monitoring the current value S on the L line of the electric circuit in real time through a current sensor and a controller, wherein the monitoring frequency is 3000 times per second; B. calculating a derivative V and a second derivative a of the current change value per microsecond through a controller; C. comparing the current value S with a preset maximum current value I through a controller, and if S is larger than or equal to I, V is larger than or equal to 30A/mus, and a is larger than or equal to 5A/mus, judging that the electric circuit is in short circuit; D. and if the short circuit of the electric circuit is judged, the relay is disconnected through the controller, and the power-off protection is carried out. Wherein, the L line is a live line. The controller comprises a single chip microcomputer with the model of STC15W408 AS.
As shown in fig. 1, in the method for predicting short circuit of electrical line according to the present invention, the current sensor in step a is a hall current sensor. And C, presetting a maximum current value I according to the condition of the electric equipment on the electric line. And D, if the electrical line is judged to be short-circuited in the step D, starting an alarm through the controller to alarm. And D, if the short circuit of the electric line is judged to occur in the step D, simultaneously uploading the monitoring information to the background server through a communication unit on the controller. And an electric operation recovery switch is arranged on the controller.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. An electrical line short circuit prediction method, comprising the steps of:
A. monitoring the current value S on the L line of the electric circuit in real time through a current sensor and a controller, wherein the monitoring frequency is 3000 times per second;
B. calculating a derivative V and a second derivative a of the current change value per microsecond through a controller;
C. comparing the current value S with a preset maximum current value I through a controller, and if S is larger than or equal to I, V is larger than or equal to 30A/mus, and a is larger than or equal to 5A/mus, judging that the electric circuit is in short circuit;
D. if the short circuit of the electric line is judged, the relay is disconnected through the controller for power-off protection, and if the short circuit of the electric line is judged, monitoring information is uploaded to the background server through the communication unit on the controller.
2. An electrical line short-circuit prediction method according to claim 1, characterized in that: and the current sensor in the step A is a Hall current sensor.
3. An electrical line short-circuit prediction method according to claim 1, characterized in that: and C, presetting a maximum current value I according to the condition of the electric equipment on the electric line.
4. An electrical line short-circuit prediction method according to claim 1, characterized in that: and D, if the electrical line is judged to be short-circuited in the step D, starting an alarm through the controller to alarm.
5. An electrical line short-circuit prediction method according to claim 1, characterized in that: and an electric operation recovery switch is arranged on the controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710977371.9A CN107884662B (en) | 2017-10-16 | 2017-10-16 | Electrical line short circuit prediction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710977371.9A CN107884662B (en) | 2017-10-16 | 2017-10-16 | Electrical line short circuit prediction method |
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| CN107884662A CN107884662A (en) | 2018-04-06 |
| CN107884662B true CN107884662B (en) | 2020-10-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109142862A (en) * | 2018-09-06 | 2019-01-04 | 中国人民解放军海军工程大学 | A kind of intelligent electrically engineering survey system and its measurement method |
| CN111969725B (en) * | 2020-07-28 | 2022-03-29 | 福建集薪物联网科技有限公司 | Air switch with electricity safety advanced early warning function |
Citations (1)
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| JP2016176924A (en) * | 2015-03-18 | 2016-10-06 | 積水化学工業株式会社 | Secondary battery deterioration detection system and method for detecting secondary battery deterioration |
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| JP3441596B2 (en) * | 1995-04-28 | 2003-09-02 | 三菱電機株式会社 | Insulation deterioration diagnosis device |
| DE19729599C1 (en) * | 1997-07-10 | 1999-02-04 | Siemens Ag | Method and arrangement for the detection of short circuits in low-voltage networks |
| CN101329381A (en) * | 2008-07-28 | 2008-12-24 | 庞元俊 | Method for detecting short circuit fault with current change rate |
| JP5414890B2 (en) * | 2010-04-14 | 2014-02-12 | 三菱電機株式会社 | Insulation deterioration diagnosis device |
| CN102854428B (en) * | 2011-06-28 | 2016-01-06 | 西门子公司 | A kind of method for detecting short circuit and device |
| AT511807B1 (en) * | 2011-08-01 | 2013-03-15 | Univ Wien Tech | METHOD AND DEVICE FOR ONLINE RECOGNITION OF STATE-OF-CHARGE INSULATION IN AN ELECTRICAL MACHINE |
| CN103278711B (en) * | 2013-04-28 | 2016-01-06 | 福州大学 | The early detection of a kind of short trouble and series arc faults and discrimination method |
| CN105572544B (en) * | 2016-02-01 | 2019-03-08 | 河南理工大学 | Coal Mine Power Network short trouble quick judgment method based on current changing rate |
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| JP2016176924A (en) * | 2015-03-18 | 2016-10-06 | 積水化学工業株式会社 | Secondary battery deterioration detection system and method for detecting secondary battery deterioration |
Non-Patent Citations (1)
| Title |
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| 电力设备绝缘劣化诊断法;王云熙;《河北电力技术》;19900630(第3期);全文 * |
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