CN109116285B - A capacitive voltage transformer live detection device based on multiple signal acquisition - Google Patents
A capacitive voltage transformer live detection device based on multiple signal acquisition Download PDFInfo
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- CN109116285B CN109116285B CN201810961507.1A CN201810961507A CN109116285B CN 109116285 B CN109116285 B CN 109116285B CN 201810961507 A CN201810961507 A CN 201810961507A CN 109116285 B CN109116285 B CN 109116285B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a capacitance type voltage transformer live detection device based on multiple signal collection, which comprises a signal collection unit, a signal conditioning unit, an A/D conversion unit, a central control processing unit, a storage unit, a display unit and a key input unit, wherein the live detection device collects relevant parameters of the capacitance type voltage transformer during live working, and judges whether the capacitance type voltage transformer works normally or not after analysis and calculation, if the capacitance type voltage transformer fails, an alarm signal can be sent out in time so that relevant staff can take necessary measures. The invention provides a capacitance type voltage transformer electrified detection device based on various signal acquisition, which can effectively and accurately detect the short-circuit fault and the dielectric loss state of an internal coil of the voltage transformer.
Description
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to a capacitance type voltage transformer live detection device based on multiple signal acquisition.
Background
With the continuous development of power technology, the requirements on the safety and reliability of a power system are higher and higher, and a capacitive voltage transformer is one of important equipment for protecting the power system and collecting measurement information. Along with the wider and wider application of the capacitive voltage transformer in the power system, the state detection of the capacitive voltage transformer is also paid attention to, and the detection method of the capacitive voltage transformer at present mainly comprises power failure maintenance, equipment inspection, live detection and on-line monitoring. The existing live detection method is mainly used for fault detection such as partial discharge, temperature rise and the like, and cannot effectively and accurately detect short-circuit faults and dielectric loss states of internal coils of the voltage transformer.
Disclosure of Invention
The invention provides a capacitance type voltage transformer electrified detection device based on various signal acquisition, which can effectively and accurately detect the short-circuit fault and the dielectric loss state of an internal coil of the voltage transformer.
The invention particularly relates to a capacitance type voltage transformer electrification detection device based on multiple signal collection, which comprises a signal collection unit, a signal conditioning unit, an A/D conversion unit, a central control processing unit, a storage unit, a display unit and a key input unit, wherein the signal collection unit, the signal conditioning unit, the A/D conversion unit and the central control processing unit are sequentially connected, the central control processing unit is also respectively connected with the storage unit, the display unit and the key input unit, the electrification detection device collects relevant parameters of the capacitance type voltage transformer when in electrification work, and judges whether the capacitance type voltage transformer works normally or not after analysis and calculation, if faults exist, an alarm signal can be timely sent out so that relevant staff can take necessary measures.
And the key input unit is combined with the storage unit and the display unit to complete the factory state parameter input of the capacitive voltage transformer.
The signal acquisition unit mainly acquires primary side input voltage, secondary side output voltage, current flowing through the capacitive voltage divider and current flowing through the medium-voltage electromagnetic unit of the capacitive voltage transformer, the primary side input voltage is acquired by adopting the step-down transformer, the secondary side output voltage is directly acquired from the secondary side of the capacitive voltage transformer, and the current flowing through the capacitive voltage divider and the current flowing through the medium-voltage electromagnetic unit are acquired by adopting the current transformer.
The signal conditioning unit comprises a signal amplifying module and a signal filtering module, wherein the signal amplifying module adopts an AD706 operational amplifier and can adjust the amplification factor according to the requirement, the filtering module adopts a two-stage low-pass filter, and high-frequency harmonic waves are effectively restrained through twice filtering, so that the output signal is ensured to meet the working range of the A/D conversion unit.
The central control processing unit analyzes and calculates the collected signals, and further judges whether the capacitive voltage transformer has faults or not:
If the ratio of the secondary side output voltage to the primary side input voltage is increased, the high-voltage capacitance unit of the capacitive voltage transformer breaks down or the primary coil part of the intermediate transformer is in short circuit fault;
if the ratio of the secondary side output voltage to the primary side input voltage is smaller, breakdown occurs to the medium-voltage capacitor unit of the capacitor voltage transformer or the secondary coil part of the intermediate transformer has short circuit fault;
And if the phase angle difference between the secondary side output voltage and the primary side input voltage is smaller or the ratio of the current flowing through the capacitive voltage divider to the current flowing through the medium-voltage electromagnetic unit is smaller, dielectric loss occurs in the capacitive voltage transformer.
Drawings
Fig. 1 is a schematic structural diagram of a capacitive voltage transformer live detection device based on multiple signal acquisition.
Detailed Description
The following describes in detail a specific embodiment of a capacitive voltage transformer live detection device based on multiple signal acquisition with reference to the accompanying drawings.
As shown in FIG. 1, the live detection device comprises a signal acquisition unit, a signal conditioning unit, an A/D conversion unit, a central control processing unit, a storage unit, a display unit and a key input unit, wherein the signal acquisition unit, the signal conditioning unit, the A/D conversion unit and the central control processing unit are sequentially connected, the central control processing unit is also respectively connected with the storage unit, the display unit and the key input unit, the live detection device acquires relevant parameters when the capacitive voltage transformer works in a live mode, and after analysis and calculation, whether the capacitive voltage transformer works normally or not is judged, and if faults exist, an alarm signal can be timely sent out so that relevant staff can take necessary measures.
And the key input unit is combined with the storage unit and the display unit to complete the factory state parameter input of the capacitive voltage transformer.
The signal acquisition unit mainly acquires primary side input voltage, secondary side output voltage, current flowing through the capacitive voltage divider and current flowing through the medium-voltage electromagnetic unit of the capacitive voltage transformer, the primary side input voltage is acquired by adopting the step-down transformer, the secondary side output voltage is directly acquired from the secondary side of the capacitive voltage transformer, and the current flowing through the capacitive voltage divider and the current flowing through the medium-voltage electromagnetic unit are acquired by adopting the current transformer.
The signal conditioning unit comprises a signal amplifying module and a signal filtering module, wherein the signal amplifying module adopts an AD706 operational amplifier and can adjust the amplification factor according to the requirement, the filtering module adopts a two-stage low-pass filter, and high-frequency harmonic waves are effectively restrained through twice filtering, so that the output signal is ensured to meet the working range of the A/D conversion unit.
The central control processing unit analyzes and calculates the collected signals, and further judges whether the capacitive voltage transformer has faults or not:
If the ratio of the secondary side output voltage to the primary side input voltage is increased, the high-voltage capacitance unit of the capacitive voltage transformer breaks down or the primary coil part of the intermediate transformer is in short circuit fault;
if the ratio of the secondary side output voltage to the primary side input voltage is smaller, breakdown occurs to the medium-voltage capacitor unit of the capacitor voltage transformer or the secondary coil part of the intermediate transformer has short circuit fault;
And if the phase angle difference between the secondary side output voltage and the primary side input voltage is smaller or the ratio of the current flowing through the capacitive voltage divider to the current flowing through the medium-voltage electromagnetic unit is smaller, dielectric loss occurs in the capacitive voltage transformer.
Finally, it should be noted that the above-mentioned embodiments are merely illustrative of the technical solution of the invention and not limiting thereof. It will be understood by those skilled in the art that modifications and equivalents may be made to the particular embodiments of the invention, which are within the scope of the claims appended hereto.
Claims (3)
1. The charged detection device is characterized by comprising a signal acquisition unit, a signal conditioning unit, an A/D conversion unit, a central control processing unit, a storage unit, a display unit and a key input unit, wherein the signal acquisition unit, the signal conditioning unit, the A/D conversion unit and the central control processing unit are sequentially connected, and the central control processing unit is also respectively connected with the storage unit, the display unit and the key input unit;
The signal acquisition unit acquires primary side input voltage, secondary side output voltage, current flowing through the capacitive voltage divider and current flowing through the medium-voltage electromagnetic unit of the capacitive voltage transformer, the primary side input voltage is acquired by adopting a step-down transformer, the secondary side output voltage is directly acquired from the secondary side of the capacitive voltage transformer, and the current flowing through the capacitive voltage divider and the current flowing through the medium-voltage electromagnetic unit are acquired by adopting a current transformer;
the central control processing unit analyzes and calculates the collected signals, and further judges whether the capacitive voltage transformer has faults or not:
If the ratio of the secondary side output voltage to the primary side input voltage is increased, the high-voltage capacitance unit of the capacitive voltage transformer breaks down or the primary coil part of the intermediate transformer is in short circuit fault;
if the ratio of the secondary side output voltage to the primary side input voltage is smaller, breakdown occurs to the medium-voltage capacitor unit of the capacitor voltage transformer or the secondary coil part of the intermediate transformer has short circuit fault;
And if the phase angle difference between the secondary side output voltage and the primary side input voltage is smaller or the ratio of the current flowing through the capacitive voltage divider to the current flowing through the medium-voltage electromagnetic unit is smaller, dielectric loss occurs in the capacitive voltage transformer.
2. The capacitive voltage transformer live detection device based on multiple signal acquisition according to claim 1, wherein the key input unit is combined with the storage unit and the display unit to complete factory state parameter input of the capacitive voltage transformer.
3. The charged detection device of the capacitive voltage transformer based on the multiple signal acquisition is characterized in that the signal conditioning unit comprises a signal amplifying module and a signal filtering module, the signal amplifying module adopts an AD706 operational amplifier and can adjust the amplification factor according to requirements, the filtering module adopts a two-stage low-pass filter, high-frequency harmonic waves are effectively restrained through twice filtering, and the output signal is ensured to meet the working range of the A/D conversion unit.
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| CN201810961507.1A CN109116285B (en) | 2018-08-22 | 2018-08-22 | A capacitive voltage transformer live detection device based on multiple signal acquisition |
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| CN201810961507.1A CN109116285B (en) | 2018-08-22 | 2018-08-22 | A capacitive voltage transformer live detection device based on multiple signal acquisition |
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| CN109116285B true CN109116285B (en) | 2025-01-17 |
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| CN110361686B (en) * | 2019-08-28 | 2021-05-18 | 华北电力大学（保定） | Multi-parameter-based fault detection method for capacitive voltage transformer |
| CN114113944B (en) * | 2021-11-25 | 2023-10-20 | 广东电网有限责任公司 | CVT capacitor unit breakdown defect test method and device |
| CN118226366B (en) * | 2024-05-22 | 2024-08-06 | 深圳友讯达科技股份有限公司 | Online monitoring method, device and equipment of voltage transformer and storage medium |
Citations (2)
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| CN201402318Y (en) * | 2009-04-30 | 2010-02-10 | 厦门红相电力设备股份有限公司 | Capacitive voltage transformer field calibration device |
| CN209148863U (en) * | 2018-08-22 | 2019-07-23 | 国网江苏省电力有限公司盐城供电分公司 | A capacitive voltage transformer live detection device based on multiple signal acquisition |
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| CN102122810B (en) * | 2011-03-11 | 2013-11-06 | 上海诺雅克电气有限公司 | Current diagnosing device and method for monitoring state of current transformer |
| CN103558446A (en) * | 2013-11-22 | 2014-02-05 | 国家电网公司 | Overvoltage on-line monitoring system |
| CN104142487B (en) * | 2014-08-18 | 2017-05-10 | 国家电网公司 | Electrified detecting device for tank type capacitor voltage transformer |
| CN106771645B (en) * | 2016-12-12 | 2019-06-25 | 国网四川省电力公司电力科学研究院 | Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system |
| CN106990380B (en) * | 2017-05-31 | 2020-01-31 | 国网河南省电力公司平顶山供电公司 | On-site Capacitive Voltage Transformer Fault Detection Method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201402318Y (en) * | 2009-04-30 | 2010-02-10 | 厦门红相电力设备股份有限公司 | Capacitive voltage transformer field calibration device |
| CN209148863U (en) * | 2018-08-22 | 2019-07-23 | 国网江苏省电力有限公司盐城供电分公司 | A capacitive voltage transformer live detection device based on multiple signal acquisition |
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