CN108982988B - Power failure early warning diagnosis method - Google Patents
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- CN108982988B CN108982988B CN201810516060.7A CN201810516060A CN108982988B CN 108982988 B CN108982988 B CN 108982988B CN 201810516060 A CN201810516060 A CN 201810516060A CN 108982988 B CN108982988 B CN 108982988B
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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
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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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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The invention discloses a power failure early warning diagnosis method, belonging to the technical field of power systems; the system comprises an annular loop which is arranged on the same plane with a power line, wherein an ammeter A, a parallel resistor array, a resistor array controller and an evaluation system are arranged on the loop in series; the resistance array controller changes the number of parallel resistors connected to a loop according to current data of the ammeter A, and the evaluation system changes the current change data into pressure data with a linear area by arranging a guide rail, a sliding block, an alternating current motor, a knocking hammer, a pressure sensor arranged in a differential mode and an evaluation processor; on the basis, the power fault diagnosis method which firstly carries out large-current fault diagnosis and then carries out small-current fault diagnosis can be realized; the power failure diagnosis system and the diagnosis method can monitor the current of the power line under the condition of not losing the transmission power, and can carry out effective early warning before the occurrence of transverse failure and longitudinal failure.
Description
Technical Field
The invention relates to a power failure diagnosis method, and belongs to the technical field of power systems.
Background
Faults of an electric power system can be generally classified into two major categories, a lateral fault and a longitudinal fault. The transverse faults refer to various types of short-circuit faults, and the longitudinal faults mainly refer to various types of disconnection faults.
Whether the fault is a transverse fault or a longitudinal fault, the fault can be easily detected after the fault occurs, but at the moment, remedial measures are taken, and losses caused by some faults cannot be compensated.
Research shows that the electric power system has warning signs before faults occur, the warning signs are reflected in current changes, how to utilize the current changes to early warn and diagnose the faults and play a role in prevention, and the method is a direction in which the electric power system needs to be researched intensively.
Disclosure of Invention
In order to solve the problems, the invention discloses a power failure early warning diagnosis method which utilizes the electromagnetic induction principle to monitor the current of a power line under the condition of not losing transmission electric energy, can effectively early warn before transverse failure and longitudinal failure and plays an active role in the safe operation of a power system.
The purpose of the invention is realized as follows:
a power failure early warning diagnosis method comprises the steps that an annular loop which is arranged on the same plane as a power line is arranged, and an ammeter A, a parallel resistor array, a resistor array controller and an evaluation system are arranged on the loop in series;
the current data of the ammeter A is transmitted to the resistor array controller;
the control signal of the resistor array controller is transmitted to the parallel resistor array and is used for changing the number of parallel resistors on the access loop;
the ammeter A is used for monitoring whether the current of the annular loop exceeds a threshold value or not, and the resistor array controller controls the parallel resistor array to reduce the number of parallel resistors connected to the loop under the condition that the current exceeds the threshold value;
the evaluation system comprises a guide rail, a sliding block sliding on the guide rail, an alternating current motor controlling the sliding block to slide on the guide rail, a knocking hammer arranged below the sliding block, a left pressure sensor and a right pressure sensor which are horizontally arranged on two sides of the knocking hammer at equal intervals, and an evaluation processor which is connected with the left pressure sensor and the right pressure sensor and can process and analyze data;
the left pressure sensor is arranged above the knocking hammer when the knocking hammer is located at the lowest point, the right pressure sensor is arranged below the knocking hammer when the knocking hammer is located at the lowest point, and the distance from the left pressure sensor to the lowest point of the knocking hammer is equal to the distance from the lowest point of the knocking hammer to the right pressure sensor in the vertical direction;
and the evaluation processor subtracts the pressure data of the left pressure sensor from the pressure data of the right pressure sensor, performs linear fitting on the linear section, and diagnoses the power failure according to the slope of the linear section.
The above constitutes a power failure diagnosis system.
The electric power fault early warning diagnosis method realized on the electric power fault diagnosis system comprises the following steps:
step a, diagnosing large-current fault
The ammeter A transmits current data to the resistor array controller, the resistor array controller judges whether the current of the annular loop exceeds a threshold value, and if so, the method comprises the following steps:
if the current exceeds the threshold value, judging that the power system has a large-current fault; the resistor array controller controls the parallel resistor array, reduces the number of parallel resistors on the access loop, and repeats the step;
if the current does not exceed the threshold value, judging that the power system has no large-current fault, and entering the step b;
step b, low current fault diagnosis
The evaluation processor subtracts the pressure data of the left pressure sensor from the pressure data of the right pressure sensor and fits a straight line to the linear segment if:
if the absolute value of the slope exceeds the maximum value of the threshold or is smaller than the minimum value of the threshold, the judgment result shows that the power system has a low-current fault, and the step is repeated;
and if the absolute value of the slope is not more than the maximum value of the threshold or less than the minimum value of the threshold, judging that the power system has no low-current fault, and ending.
According to the power failure diagnosis method, the current threshold, the maximum absolute value threshold and the minimum absolute value threshold are obtained through a statistical method or selected according to experience.
Has the advantages that:
firstly, because each unit for diagnosing the power failure is arranged on the annular loop which is arranged on the same plane with the power line, the current of the power line can be monitored without using the electric energy of the power line and losing the transmission electric energy;
secondly, the resistor array controller can change the number of parallel resistors on an access loop according to the current data of the ammeter A, so that not only can the transverse fault be monitored, but also the whole power fault diagnosis system can be prevented from being damaged due to the transverse fault;
and thirdly, the knocking hammer and the two pressure sensors are arranged, the two sensors are arranged in a differential mode, the change of current is changed into pressure change, meanwhile, a linear region of pressure data appears through signal conversion and the differential setting, and the power failure can be judged through the slope of the linear region, so that the data processing is simplified, and the judgment precision is improved.
Drawings
FIG. 1 is a schematic electrical connection diagram of the power failure diagnostic system and method of the present invention.
Fig. 2 is a schematic configuration diagram of the evaluation system.
Fig. 3 is a flow chart of a power failure diagnostic method of the present invention.
In the figure: the system comprises a 1 parallel resistor array, a 2 resistor array controller, a 3 evaluation system, a 31 guide rail, a 32 sliding block, a 33 alternating current motor, a 34 knocking hammer, a 35 left pressure sensor, a 36 right pressure sensor and a 37 evaluation processor.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Detailed description of the preferred embodiment
The present embodiment is a power failure diagnosis system embodiment.
Fig. 1 shows a schematic diagram of electrical connections of the power failure diagnosis system of the present embodiment. The power failure diagnosis system comprises an annular loop which is arranged on the same plane with a power line, wherein an ammeter A, a parallel resistor array 1, a resistor array controller 2 and an evaluation system 3 are arranged on the loop in series;
the current data of the ammeter A is transmitted to the resistor array controller 2;
the control signal of the resistor array controller 2 is transmitted to the parallel resistor array 1 for changing the number of parallel resistors on the access loop;
the ammeter A is used for monitoring whether the current of the annular loop exceeds a threshold value or not, and under the condition that the current exceeds the threshold value, the resistor array controller 2 controls the parallel resistor array 1 to reduce the number of parallel resistors connected to the loop;
the schematic structure of the evaluation system 3 is shown in fig. 2. The evaluation system 3 comprises a guide rail 31, a slide block 32 sliding on the guide rail 31, an alternating current motor 33 controlling the slide block 32 to slide on the guide rail, a knocking hammer 34 arranged below the slide block 32, a left pressure sensor 35 and a right pressure sensor 36 horizontally arranged at equal intervals on two sides of the knocking hammer 34, and an evaluation processor 37 connected with the left pressure sensor 35 and the right pressure sensor 36 and capable of processing and analyzing data;
the left pressure sensor 35 is arranged above the knocking hammer 34 when the knocking hammer is located at the lowest point, the right pressure sensor 36 is arranged below the knocking hammer 34 when the knocking hammer is located at the lowest point, and in the vertical direction, the distance from the left pressure sensor 35 to the lowest point of the knocking hammer 34 is equal to the distance from the lowest point of the knocking hammer 34 to the right pressure sensor 36;
the evaluation processor 37 subtracts the pressure data of the left pressure sensor 35 from the pressure data of the right pressure sensor 36, and performs a straight line fitting on the linear segment, and diagnoses the power failure based on the slope of the linear segment.
Detailed description of the invention
The present embodiment is an embodiment of a power failure diagnosis system implemented on the power failure diagnosis system described in the first embodiment.
The flowchart of the power failure diagnosis method of the present embodiment is shown in fig. 3. The power failure diagnosis method comprises the following steps:
step a, diagnosing large-current fault
The ammeter A transmits current data to the resistor array controller 2, the resistor array controller 2 judges whether the loop current exceeds a threshold value, and if so:
if the current exceeds the threshold value, judging that the power system has a large-current fault; the resistor array controller 2 controls the parallel resistor array 1, reduces the number of parallel resistors on the access loop, and repeats the step;
if the current does not exceed the threshold value, judging that the power system has no large-current fault, and entering the step b;
step b, low current fault diagnosis
The evaluation processor 37 subtracts the pressure data of the left pressure sensor 35 from the pressure data of the right pressure sensor 36 and fits a straight line to the linear segment if:
if the absolute value of the slope exceeds the maximum value of the threshold or is smaller than the minimum value of the threshold, the judgment result shows that the power system has a low-current fault, and the step is repeated;
and if the absolute value of the slope is not more than the maximum threshold value and not less than the minimum threshold value, judging that the power system has no low-current fault, and ending.
By applying the power failure diagnosis system and the diagnosis method, the early warning diagnosis and discovery of the failure are effectively realized, the safety precaution measures are convenient to take in advance, and the safety and the stability of the power system are effectively ensured.
According to the electric power fault early warning diagnosis method, the current threshold, the maximum absolute value threshold and the minimum absolute value threshold need to be obtained through a statistical method or selected according to experience by combining the load condition. Since the value selection work is routine for those skilled in the art and can be obtained through limited experiments, the description is not repeated in this embodiment.
Claims (2)
1. A power failure early warning diagnosis method is characterized in that,
firstly, an annular loop which is arranged on the same plane as a power line is arranged, and an ammeter A, a parallel resistor array (1), a resistor array controller (2) and an evaluation system (3) are arranged on the loop in series;
the current data of the ammeter A is transmitted to a resistor array controller (2);
the control signal of the resistor array controller (2) is transmitted to the parallel resistor array (1) and is used for changing the number of parallel resistors on the access loop;
the ammeter A is used for monitoring whether the current of the annular loop exceeds a threshold value or not, and under the condition that the current exceeds the threshold value, the resistor array controller (2) controls the parallel resistor array (1) to reduce the number of parallel resistors connected to the loop;
the evaluation system (3) comprises a guide rail (31), a sliding block (32) sliding on the guide rail (31), an alternating current motor (33) controlling the sliding block (32) to slide on the guide rail, a knocking hammer (34) arranged below the sliding block (32), a left pressure sensor (35) and a right pressure sensor (36) which are horizontally arranged on two sides of the knocking hammer (34) at equal intervals, and an evaluation processor (37) which is connected with the left pressure sensor (35) and the right pressure sensor (36) and can process and analyze data;
the left pressure sensor (35) is arranged above the knocking hammer (34) when the knocking hammer is located at the lowest point, the right pressure sensor (36) is arranged below the knocking hammer (34) when the knocking hammer is located at the lowest point, and in the vertical direction, the distance from the left pressure sensor (35) to the lowest point of the knocking hammer (34) is equal to the distance from the lowest point of the knocking hammer (34) to the right pressure sensor (36);
the evaluation processor (37) subtracts the pressure data of the left pressure sensor (35) from the pressure data of the right pressure sensor (36), performs straight line fitting on the linear segment, and diagnoses the power failure according to the slope of the linear segment;
then the diagnosis is carried out according to the following steps:
step a, diagnosing large-current fault
The ammeter A transmits current data to the resistor array controller (2), the resistor array controller (2) judges whether the loop current exceeds a threshold value, and if so:
if the current exceeds the threshold value, judging that the power system has a large-current fault; the resistor array controller (2) controls the parallel resistor array (1), reduces the number of parallel resistors on the access loop and repeats the step;
if the current does not exceed the threshold value, judging that the power system has no large-current fault, and entering the step b;
step b, low current fault diagnosis
An evaluation processor (37) subtracts the pressure data of the left pressure sensor (35) from the pressure data of the right pressure sensor (36) and applies a straight line fit to the linear segment if:
if the absolute value of the slope exceeds the maximum value of the threshold or is smaller than the minimum value of the threshold, the judgment result shows that the power system has a low-current fault, and the step is repeated;
and if the absolute value of the slope is not more than the maximum threshold value and not less than the minimum threshold value, judging that the power system has no low-current fault, and ending.
2. The electric power fault early warning diagnosis method according to claim 1, wherein the threshold value of the current, the threshold maximum value of the absolute value of the slope, and the threshold minimum value of the absolute value of the slope are obtained through a statistical method or selected according to experience.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810516060.7A CN108982988B (en) | 2016-05-25 | 2016-05-25 | Power failure early warning diagnosis method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810516060.7A CN108982988B (en) | 2016-05-25 | 2016-05-25 | Power failure early warning diagnosis method |
| CN201610351503.2A CN105954620B (en) | 2016-05-25 | 2016-05-25 | A kind of power fault detection system |
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| CN201610351503.2A Division CN105954620B (en) | 2016-05-25 | 2016-05-25 | A kind of power fault detection system |
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| CN108982988A CN108982988A (en) | 2018-12-11 |
| CN108982988B true CN108982988B (en) | 2020-10-30 |
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| CN201810276279.4A Active CN108445325B (en) | 2016-05-25 | 2016-05-25 | Power failure diagnosis system |
| CN201810516060.7A Active CN108982988B (en) | 2016-05-25 | 2016-05-25 | Power failure early warning diagnosis method |
| CN201810276509.7A Active CN108318765B (en) | 2016-05-25 | 2016-05-25 | Power failure diagnosis method |
| CN201610351503.2A Active CN105954620B (en) | 2016-05-25 | 2016-05-25 | A kind of power fault detection system |
| CN201810276766.0A Active CN108469565B (en) | 2016-05-25 | 2016-05-25 | Power failure diagnosis method and application thereof in power failure diagnosis |
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| CN201610351503.2A Active CN105954620B (en) | 2016-05-25 | 2016-05-25 | A kind of power fault detection system |
| CN201810276766.0A Active CN108469565B (en) | 2016-05-25 | 2016-05-25 | Power failure diagnosis method and application thereof in power failure diagnosis |
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| CN108445325B (en) * | 2016-05-25 | 2020-09-04 | 西安兆腾测控技术有限公司 | Power failure diagnosis system |
| JP6230677B1 (en) * | 2016-10-20 | 2017-11-15 | 三菱電機株式会社 | Control device and control method for rotating electrical machine |
| CN108828375B (en) * | 2018-08-17 | 2020-08-14 | 国网江苏省电力有限公司电力科学研究院 | Air conditioner electric monitoring system and method based on double-loop intelligent electric energy meter |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108318765B (en) | 2020-11-27 |
| CN108445325B (en) | 2020-09-04 |
| CN108469565B (en) | 2020-10-27 |
| CN108318765A (en) | 2018-07-24 |
| CN108445325A (en) | 2018-08-24 |
| CN108982988A (en) | 2018-12-11 |
| CN105954620A (en) | 2016-09-21 |
| CN105954620B (en) | 2018-09-07 |
| CN108469565A (en) | 2018-08-31 |
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Effective date of registration: 20200925 Address after: 518000 floor 14, building 13, qinchengda paradise, zone 22, lingzhiyuan community, Xin'an street, Bao'an District, Shenzhen City, Guangdong Province Applicant after: Shenzhen lattice Electric Power Design Institute Co.,Ltd. Address before: 255086 Shandong city of Zibo province high tech Zone Willow Road No. 280 North luzhongchenbao apartment room 1803 Applicant before: Li Aixia |
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Address after: 518000 14 / F, building 13, qinchengda paradise, District 22, lingzhiyuan community, Xin'an street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen grid Smart Energy Co.,Ltd. Address before: 518000 14 / F, building 13, qinchengda paradise, District 22, lingzhiyuan community, Xin'an street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen lattice Electric Power Design Institute Co.,Ltd. |