CN113465902A - Method for diagnosing operation state of secondary circuit of high-voltage current transformer - Google Patents
Method for diagnosing operation state of secondary circuit of high-voltage current transformer Download PDFInfo
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- CN113465902A CN113465902A CN202110869303.7A CN202110869303A CN113465902A CN 113465902 A CN113465902 A CN 113465902A CN 202110869303 A CN202110869303 A CN 202110869303A CN 113465902 A CN113465902 A CN 113465902A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a method for diagnosing the operation state of a secondary circuit of a high-voltage current transformer, which comprises the following steps of firstly, fixing a contact type online vibration monitoring device on a lifting seat of the current transformer, and measuring the vibration characteristic; then, the current transformer vibration characteristic monitor judges the operation condition of the secondary circuit based on the current transformer vibration characteristic. The invention discloses detailed steps of a method for judging the operation condition of a secondary circuit based on the vibration characteristic of a current transformer, which is simple and easy to implement and can ensure that whether the secondary circuit is abnormal or not can be judged more accurately by adopting the method when the current transformer operates.
Description
Technical Field
The invention belongs to the field of operation monitoring of current transformers.
Background
The current transformer is widely used in power systems, and has the function of converting large current of a primary system into small current of a secondary system according to a certain proportion for measuring, metering, relay protection and automation devices. It is known that the secondary side of the current transformer must not be opened, and once the current transformer is opened, the secondary side will have a serious influence. In actual work, the current transformer has the possibility of secondary open circuit, for example, a transition terminal of a secondary circuit is loosened after being oxidized, for example, a contact of a secondary wiring terminal is not tightly pressed, and the open circuit is caused by heating and blowing or oxidation overheating.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide a method for diagnosing the operation state of the secondary circuit of the high-voltage current transformer, which can comprehensively monitor the operation state of the current transformer in real time and accurately judge whether the secondary circuit of the current transformer is open or not so as to be convenient for timely processing, avoid potential safety hazards and power supply accidents caused by the faults of the current transformer and ensure the safe and stable operation of an electric power system.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for diagnosing the operation state of a secondary circuit of a high-voltage current transformer comprises the following steps:
step 1, measuring the vibration characteristic of a current transformer;
step 3, measuring to obtain the vibration amplitude A400 at the position of 400Hz in the vibration frequency spectrum of the current transformer, and if the vibration amplitude A400 at the position of 400Hz is less than 0.005g, judging that the vibration of the current transformer is caused by external vibration; if the vibration amplitude A400 at 400Hz is not less than 0.005g but less than 0.01g, carrying out the next judgment; if the vibration amplitude A400 at the 400Hz position is not less than 0.01g, judging that the current transformer is open-circuited;
Preferably, the vibration characteristics of the current transformer are measured using a contact type online vibration monitoring sensor.
Preferably, the contact type online vibration monitoring sensor is mounted on a lifting seat of the current transformer.
According to the technical scheme, the operation state of the current transformer is monitored in real time according to the characteristic of abnormal vibration when the secondary circuit of the current transformer is opened, so that the open circuit in the secondary circuit can be found and processed in time conveniently, potential safety hazards and power supply accidents caused by faults of the current transformer are avoided, and the safe and stable operation of a power system is ensured. Compared with the prior art, its obvious advantage is:
1) the invention solves the problem that the operation condition of the secondary circuit of the current transformer is difficult to monitor in real time;
2) the invention discloses detailed steps of a method for judging the operation condition of a secondary circuit based on the vibration characteristic of a current transformer, which is simple and easy to implement and can ensure that whether the secondary circuit is abnormal or not can be judged more accurately by adopting the method when the current transformer operates.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a flow chart of a method for determining a secondary circuit operating condition based on a current transformer vibration characteristic;
FIG. 2 is a harmonic variation graph of a method of determining a secondary circuit operating condition based on a current transformer vibration characteristic;
fig. 3 is a block diagram of a device for diagnosing the operating state of the secondary circuit of the high-voltage current transformer.
Detailed Description
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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
Under the normal operation condition, the vibration amplitude of the current transformer is very low and is not higher than 0.003g, and the current transformer is a stable sine wave with the frequency of 50 Hz. The current transformer has abnormal vibration under the condition that the secondary circuit is seriously in poor contact or is in an open circuit, so that whether the secondary circuit is in poor contact or is in an open circuit or not can be analyzed by extracting the vibration characteristic quantity of the current transformer.
Based on the above situation, the invention provides a device and a method for diagnosing the operation state of the secondary circuit of the high-voltage current transformer, aiming at the characteristic of abnormal vibration when the secondary circuit of the current transformer is opened, the operation state of the current transformer is monitored in real time, the open circuit existing in the secondary circuit is conveniently and timely found and processed, the potential safety hazard and the power supply accident caused by the fault of the current transformer are avoided, and the safe and stable operation of an electric power system is ensured.
As shown in fig. 3, the device for diagnosing the operating state of the secondary circuit of the high-voltage current transformer comprises a contact type online vibration monitoring sensor 3 installed on the current transformer and a vibration characteristic monitor of the current transformer, wherein the vibration characteristic of the current transformer is measured by using the contact type online vibration monitoring sensor, and the vibration characteristic monitor of the current transformer is provided with a voltage signal interface 5 connected with the contact type online vibration monitoring sensor.
The contact type online vibration monitoring sensor is arranged on a lifting seat of the current transformer. The current transformer vibration characteristic monitor comprises a single chip microcomputer 1, an analog/digital conversion module 2, a voltage signal interface 5, a display module 4, a power supply module 6 and a key module 7; vibration signals are collected through the contact type online vibration monitoring sensor, transmitted to a voltage signal interface to be amplified, converted by the analog/digital conversion module and then input into the single chip microcomputer to be processed, and finally a judgment result is output and displayed on the display module. The input of the power supply module is a 12V rechargeable battery, and the output of the power supply module is 5V and 24V. The conversion from 12V to 5V is realized by an LM2576 chip, and the conversion from 12V to 24V is realized by an MC34063 chip.
According to the invention, the vibration characteristics of the current transformer are measured by using the contact type online vibration monitoring sensor, and the current transformer vibration characteristic monitor judges the operation condition of the secondary circuit based on the vibration characteristics of the current transformer, so that the problem that the operation condition of the secondary circuit of the current transformer is difficult to monitor in real time is solved.
Referring to fig. 1 and 2, a method for diagnosing an operating state of a secondary circuit of a high-voltage current transformer includes the following steps:
firstly, fixing a contact type online vibration monitoring device on a current transformer lifting seat, and measuring vibration characteristics;
and then judging the vibration amplitude A0 of the lifting seat of the current transformer according to the measurement result, and if the vibration amplitude A0 is greater than 0.02g, carrying out the next measurement.
When the vibration amplitude A0 is greater than 0.02g, the vibration amplitude A400 at 400Hz in the vibration spectrum of the current transformer needs to be further judged: when the vibration amplitude A400 at 400Hz in the vibration frequency spectrum is smaller than 0.005g, judging that the vibration of the current transformer is caused by external vibration; if the vibration amplitude A400 at 400Hz is not less than 0.005g but less than 0.01g, carrying out the next judgment; and if the vibration amplitude A400 at the 400Hz position is not less than 0.01g, judging that the current transformer is open-circuited and needing to be checked immediately.
If the vibration amplitude a400 at 400Hz is not less than 0.005g but less than 0.01g, the duration of the abnormal state of the current transformer needs to be determined. And continuously measuring the vibration amplitude A400 at 400Hz in the vibration frequency spectrum of the lifting seat of the current transformer, and judging whether the vibration amplitude is still not less than 0.005g but less than 0.01g after 30 s. If the vibration exists continuously, judging that the current transformer is open-circuited and needing to be checked; and if the vibration disappears, judging that the vibration of the current transformer is caused by external violent vibration.
The method is simple and easy to implement, and whether the secondary circuit is abnormal or not can be accurately judged by the method when the current transformer operates.
The method can comprehensively diagnose the operation state of the secondary circuit of the high-voltage current transformer by detecting and analyzing the vibration characteristic of the current transformer in the operation state, help to find and process open circuits existing in the secondary circuit in time, avoid potential safety hazards and power supply accidents caused by faults of the current transformer, and ensure that the power system operates safely and stably. The method has higher popularization and practicability in the field of current transformer state monitoring.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (3)
1. A method for diagnosing the operation state of a secondary circuit of a high-voltage current transformer is characterized by comprising the following steps:
step 1, measuring the vibration characteristic of a current transformer;
step 2, measuring to obtain the vibration amplitude A0 of the current transformer, and if the vibration amplitude A0 is larger than 0.02g, carrying out the next measurement;
step 3, measuring to obtain the vibration amplitude A400 at the position of 400Hz in the vibration frequency spectrum of the current transformer, and if the vibration amplitude A400 at the position of 400Hz is less than 0.005g, judging that the vibration of the current transformer is caused by external vibration; if the vibration amplitude A400 at 400Hz is not less than 0.005g but less than 0.01g, carrying out the next judgment; if the vibration amplitude A400 at the 400Hz position is not less than 0.01g, judging that the current transformer is open-circuited;
step 4, continuously measuring the vibration amplitude A400 at the position of 400Hz in the vibration frequency spectrum of the current transformer, judging whether the vibration amplitude is still not less than 0.005g but less than 0.01g after 30s, and if the vibration exists continuously, judging that the current transformer is open-circuited; and if the vibration disappears, judging that the vibration of the current transformer is caused by external violent vibration.
2. The method for diagnosing the operating state of the secondary circuit of the high-voltage current transformer as recited in claim 1, wherein: and measuring the vibration characteristics of the current transformer by using a contact type online vibration monitoring sensor.
3. The method for diagnosing the operating state of the secondary circuit of the high-voltage current transformer as recited in claim 2, wherein: the contact type online vibration monitoring sensor is arranged on a lifting seat of the current transformer.
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| CN202110869303.7A CN113465902B (en) | 2021-07-30 | 2021-07-30 | Method for diagnosing operation state of secondary circuit of high-voltage current transformer |
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| CN202110869303.7A CN113465902B (en) | 2021-07-30 | 2021-07-30 | Method for diagnosing operation state of secondary circuit of high-voltage current transformer |
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| CN113465902B CN113465902B (en) | 2023-06-23 |
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