CN106291085A - Short-circuit current of near zone of transformer monitoring method - Google Patents
Short-circuit current of near zone of transformer monitoring method Download PDFInfo
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- CN106291085A CN106291085A CN201610900110.2A CN201610900110A CN106291085A CN 106291085 A CN106291085 A CN 106291085A CN 201610900110 A CN201610900110 A CN 201610900110A CN 106291085 A CN106291085 A CN 106291085A
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
- G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc
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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
- G01R31/62—Testing of transformers
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of short-circuit current of near zone of transformer monitoring method, on the threephase current transformer of Circuit Fault on Secondary Transformer concatenation three-phase noninductive resistance by gather analogue signal through signal through isolated amplifier, low pass filter, absolute value converting unit and range self-adapting unit deliver to A/D sampling unit, A/D sampling unit continuous acquisition analogue signal, first processor carries out computing to the current sampling data read, screening obtains current effective value and the fault instantaneous value of jump-value of current of waveform, the fault data that fault occurs the moment is cached in dual-ported memory, second processor receives the fault data of dual-ported memory and draws oscillogram through network interface with host computer communication, jumbo memorizer is added up and be stored into the fault data received by the second processor simultaneously.Short Circuit Fault on Secondary Transformer dash current is acquired, records and analyzes by the present invention, can provide accurate foundation for transformator operational application and maintenance.
Description
The application is Application No.: 201210068241.0, and invention and created name is that " short-circuit current of near zone of transformer is real-time
Monitoring method ", filing date: the divisional application of the application for a patent for invention on March 15th, 2012.
Technical field
The present invention relates to a kind of real-time monitoring method for short-circuit current of near zone of transformer, belong to short-circuit current of near zone of transformer prison
Survey technology field.
Background technology
Power transformer is as the nucleus equipment of electrical network, most important to the safe and reliable operation of electrical network.Only to transformation
The fault of device is accurately analyzed and judges, just can take in time and effective treatment measures, it is ensured that electrical network properly functioning and
Normal power supply to user.110kV transformator is after low-pressure side suffers terminal short-circuit, near region short circuit, and Transformer Winding can be born
Sizable electric current, affects its health status；Short circuit current all can form build-up effect to Transformer Winding every time, is formed latent
Volt property corrupted, therefore the short circuit of transformator near region is a necessary detection project.And at present for the inspection of transformator near region short circuit
Survey is to use measuring transformer insulation resistance, and the most comprehensive Chromatographic Analysis of Transformer oil is with the overheating fault within judgement and electric discharge
Property fault, and determine the order of severity of fault and general position, it is possible to find fault severity level after the short circuit of transformator near region,
Thus corresponding anti-accident measures is proposed.But above-mentioned detection of complex, owing to cannot provide Short Circuit Fault on Secondary Transformer surge
The size of amount and number of shocks, therefore accurately can not provide foundation for transformator operational application and maintenance.
Summary of the invention
It is an object of the invention to provide one Short Circuit Fault on Secondary Transformer dash current to be acquired, record and be divided
Analysis, can provide the short-circuit current of near zone of transformer monitoring method of accurate foundation for transformator operational application and maintenance.
The present invention is that the technical scheme reaching above-mentioned purpose is: a kind of short-circuit current of near zone of transformer monitoring method, and it is special
Levying and be: be serially connected with three-phase noninductive resistance on the threephase current transformer of Circuit Fault on Secondary Transformer respectively, three-phase noninductive resistance will be adopted
The analogue signal of collection carries out isolation through signal isolated amplifier and amplifies, the high frequency division in low pass filter filters analogue signal
Amount and the conversion of absolute value converting unit, by the range self-adapting unit that controlled by first processor according to input analogue signal
Wave-shape amplitude carry out automatic range switching, deliver in A/D sampling unit after the analogue signal of collection is amplified, A/D sample singly
Unit transports to first processor after continuous acquisition analogue signal is converted into digital signal, the first processor current sample to reading
Data carry out computing, screen and obtain the current effective value of waveform and the fault instantaneous value of jump-value of current, by current effective value
And the characteristic quantity that the fault instantaneous value of jump-value of current triggers as data record, when meeting an any of the above described characteristic quantity it is
In the moment that fault occurs, fault occurring that the fault data in moment be cached in dual-ported memory, the second processor receives both-end
The fault data of mouthful memorizer by network interface and host computer communication, host computer reception fault data also draws waveform to change
Depressor near region short circuit current is monitored in real time, and the fault data received is added up and is stored into greatly by the second processor simultaneously
The memorizer of capacity.
The present invention is first for measuring by the three-phase noninductive resistance being connected on each phase current mutual inductor of Circuit Fault on Secondary Transformer
Part, therefore can monitor in real time the electric current flowing through Transformer Winding, and noninductive resistance not have shadow to secondary loop of mutual inductor
Ring, by isolated amplifier, the analogue signal on noninductive resistance is carried out isolation and amplify, then filter signal through low pass filter
In high fdrequency component, by absolute value converting unit, exchange is converted to direct current, can be according to input by range adaptive unit
The amplitude automatic switching range of signal, amplifies collection signal and delivers to A/D sampling unit and sample, and first processor is to fixed
Time the data that obtain carry out the screening of computing, obtain virtual value and the fault instantaneous value of waveform, and by current effective value and electric current
Two characteristic quantities that the fault instantaneous value of Sudden Changing Rate triggers as data record, when any one characteristic quantity can determine that fault occurs
Moment, fault occurs that the fault data in moment be cached in dual-ported memory, can to occur current break logout
The fault datas such as waveform, virtual value and time of origin, screen and record useful current data, can reach response rapidly,
And the short circuit current after becoming surely can be caught, there is preferable stable state and transient performance, the present invention is gathering transformator two
Secondary side is normal and the real time data of current waveform under failure condition, and fault data is cached in dual-ported memory, and second processes
Device receives the fault data of dual-ported memory and connects host computer through network interface, receives fault data by host computer and draws ripple
Short-circuit current of near zone of transformer is monitored by shape in real time so that the monitoring more intuitive and convenient to short circuit current, passes through simultaneously
Second processor statistics fault data, to run duration generation event current maxima, the size of rush of current amount and impact time
Number and the fault data such as attack time are added up, for Condition Maintenance Method of Transformer decision system provide strong data foundation and
Support.The present invention carries out computing and screening by first processor to sampled data, is entered fault data by the second processor
Row statistics and communication, monitor system run all right, and functional reliability is good, and integrated level is high, can meet onsite application demand.
Accompanying drawing explanation
Fig. 1 is that short-circuit current of near zone of transformer real-time monitoring device of the present invention connects structured flowchart on the transformer.
Fig. 2 is the structured flowchart of short-circuit current of near zone of transformer real-time monitoring device of the present invention.
Detailed description of the invention
Such as Fig. 1, shown in 2, the short-circuit current of near zone of transformer monitoring method of the present invention, the three-phase current of Circuit Fault on Secondary Transformer
Being serially connected with three-phase noninductive resistance on transformer respectively, the analogue signal of collection is entered by three-phase noninductive resistance through signal isolated amplifier
Row isolation is amplified, the high fdrequency component in low pass filter filters analogue signal and the conversion of absolute value converting unit, will exchange
Electricity is converted to unidirectional current, by the range self-adapting unit that controlled by first processor according to the wave-shape amplitude of input analogue signal
Carry out automatic range switching, analogue signal is amplified to one suitably in the range of, deliver to after the analogue signal of collection is amplified
In A/D sampling unit, A/D sampling unit transports to first processor after continuous acquisition analogue signal is converted into digital signal, the
One processor carries out computing to the current sampling data read, and can use instrument the most frequently used when signal is analyzed and is processed
One of fast Fourier transformation operation, screen and obtain the current effective value of waveform and the fault instantaneous value of jump-value of current,
The characteristic quantity fault instantaneous value of current effective value and jump-value of current triggered as data record, meets any one feature
Amount determines the moment that fault occurs, and fault occurs that the fault data in moment be cached in dual-ported memory, and current effective value is
1ms-20ms time interval and load current are at the current value of 0.1A～5A, and the fault instantaneous value of jump-value of current is lasting
The time load current between 100ms to the 1s current value more than 5A～50A, to the current break logout ripple occurred
Shape, virtual value and time of origin fault data, the second processor receives the fault data of dual-ported memory and passes through network
Interface and host computer communication, host computer receives fault data and draws waveform and supervise short-circuit current of near zone of transformer in real time
Surveying, jumbo memorizer, the second processor pair are added up and be stored into the fault data received by the second processor simultaneously
Run duration generation event current maxima, the size of rush of current amount and number of shocks and attack time fault data are carried out
Statistics, can carry out data interaction by jumbo memorizer and Managing system of above position machine, Short Circuit Fault on Secondary Transformer be impacted
The maximum of electric current, the size of rush of current amount and number of shocks are supplied to running state of transformer assessment and use, for transformator
Decision-making of Condition-based Maintenance system provides strong data foundation and support.
Such as Fig. 1, shown in 2, short-circuit current of near zone of transformer real-time monitoring device of the present invention, including three-phase noninductive resistance, letter
Number collecting unit, CPU and communication unit and host computer, this noninductive resistance use four pin configurations without electrification
Resistance, not only volume is little, and resistance is optional, and signal processing circuit is simple, and certainty of measurement is high, and secondary loop of mutual inductor is not had shadow
Ring, it is adaptable to secondary circuit transformation feature.Signal isolated amplifier that the signal gathering unit of the present invention includes being sequentially connected with, low
Bandpass filter, absolute value converting unit and range self-adapting unit and A/D collecting unit, be serially connected in Circuit Fault on Secondary Transformer respectively
Threephase current transformer on three-phase noninductive resistance connect the input of signal isolated amplifier, will be taken by three-phase noninductive resistance
The electric current of sample current transformer loop, the isolated amplifier of the present invention can use ISO series isolated amplifier, on noninductive resistance
Analogue signal carry out isolation amplify, the low pass filter of the present invention can use RC low pass filter, through low pass filter filter
Except the high fdrequency component in signal, absolute value converting unit can use absolute value transducer that exchange is converted to direct current, and by the
Carry out self adaptation range switching under the control of the complex programmable logic device (CPLD) in one processor, signal is amplified to one
Deliver to the sampling of A/D sampling unit, A/D sampling unit optional DTE3216 collection plate in the range of He Shi, there are 16 100KHz and adopt
The A/D converter of sample rate, samples to normal load current waveform and fault current waveform two-forty.
Such as Fig. 1, shown in 2, the CPU of the present invention includes at first to signals collecting computing and screening
Managing device, dual-ported memory and be used for data statistics and the second processor of communication, dual-ported memory passes through data/address bus
Being connected with first processor and the second processor respectively, dual-ported memory can use IDT70V9289, and first processor uses
Dsp processor, it is the C2000 platform that American TI company releases that dsp processor can be selected for TMS320F2812, TMS320F2812
On fixed point 32 bit DSP chip, its run clock may be up to 150MHz, process performance is up to 150MIPS, for 128: 32
The fft algorithm (Q30) of position real number, the execution time only needs 6763 instruction cycles, arithmetic speed superior performance, and the second processor is adopted
With arm processor, arm processor can use the LPC2220 microprocessor of Phillips, and LPC2220 microcontroller is one
Hold real-time simulation and embed 32/16 the ARM7TDMI-S CPU followed the tracks of, 144 foot encapsulation, extremely low power consumption, multiple 32 bit timings
Device, 8 tunnel 10 ADC, PWM output and up to 9 external interrupt pins, in having small-sized, quick, low energy consumption, integrated form RISC
The features such as core.The input of the output termination first processor of A/D collecting unit of the present invention, the first processor electric current to reading
Sampled data carries out fast Fourier transform i.e. FFT computing, the characteristic quantity triggered as data record using jump-value of current and with
By two characteristic quantities, the characteristic quantity that current effective value triggers as data record, determines that the moment that fault occurs carries out short circuit
Differentiating, screening obtains current effective value and the fault instantaneous value of jump-value of current of waveform, the fault data caching that will filter out
It is then sent through the second processor to dual-ported memory.The communication unit of the present invention includes network interface and PORT COM, at second
Reason device is connected with network interface and PORT COM, and network interface and host computer connecting communication, final waveform is passed by network interface
To host computer and draw waveform, being directly monitored short circuit current, this network interface can use Ethernet interface, the second processor
Being connected with mass storage by PORT COM, the Ethernet interface of the present invention uses DM9000AE chip, and this chip volume is little,
Having AUTO-Midx (supporting direct interconnection automatic turning) TCP/IP and accelerate function, its access time is 20nsl/o, can alleviate
The burden of the second processor, is effectively improved the usefulness of whole device.PORT COM of the present invention is connected with mass storage, and second
Jumbo memorizer is added up and be stored into the fault data received by processor, and run duration is occurred by the second processor
Event current maxima, number of times fault data are added up, and are realized the exchange of local data by jumbo memorizer, or with
Managing system of above position machine carries out data interaction.
Claims (1)
1. a short-circuit current of near zone of transformer monitoring method, it is characterised in that:
Being serially connected with three-phase noninductive resistance on the threephase current transformer of Circuit Fault on Secondary Transformer respectively, three-phase noninductive resistance is by collection
Analogue signal carries out isolation through signal isolated amplifier and amplifies, high fdrequency component in low pass filter filters analogue signal and
The conversion of absolute value converting unit, by the range self-adapting unit that controlled by first processor according to the ripple of input analogue signal
Shape amplitude carries out automatic range switching, delivers in A/D sampling unit, A/D sampling unit pair after the analogue signal of collection being amplified
Continuous acquisition analogue signal transports to first processor after being converted into digital signal, the first processor current sampling data to reading
Carry out computing, screen and obtain the current effective value of waveform and the fault instantaneous value of jump-value of current, by current effective value and electricity
The characteristic quantity that triggers as data record of fault instantaneous value of stream Sudden Changing Rate, by two characteristic quantities determine that fault occurs time
Quarter carries out short circuit discrimination, and fault occurs that the fault data in moment be cached in dual-ported memory, and the second processor receives both-end
The fault data of mouthful memorizer by network interface and host computer communication, host computer reception fault data also draws waveform to change
Depressor near region short circuit current is monitored in real time, and the fault data received is added up and is stored into greatly by the second processor simultaneously
The memorizer of capacity；
Wherein, isolated amplifier uses ISO series isolated amplifier, the analogue signal on noninductive resistance carries out isolation and amplifies,
Low pass filter uses RC low pass filter, the high fdrequency component in low pass filter filters signal, absolute value converting unit
Can use absolute value transducer that exchange is converted to direct current, and by the complex programmable logic device (CPLD) in first processor
Control under carry out self adaptation range switching, signal is amplified to one suitably in the range of deliver to the sampling of A/D sampling unit, A/
D sampling unit selects DTE3216 collection plate, has the A/D converter of 16 100KHz sample rates, to normal load current waveform and
Fault current waveform two-forty is sampled；
First processor carries out fast Fourier transform i.e. FFT computing to the current sampling data read；
Described current effective value is 1ms-20ms time interval and the load current current value at 0.1A～5A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610900110.2A CN106291085B (en) | 2012-03-15 | 2012-03-15 | Short-circuit current of near zone of transformer monitoring method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210068241.0A CN102565524B (en) | 2012-03-15 | Real-time monitoring method for short-circuit current of near zone of transformer | |
| CN201610900110.2A CN106291085B (en) | 2012-03-15 | 2012-03-15 | Short-circuit current of near zone of transformer monitoring method |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210068241.0A Division CN102565524B (en) | 2012-03-15 | 2012-03-15 | Real-time monitoring method for short-circuit current of near zone of transformer |
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| Publication Number | Publication Date |
|---|---|
| CN106291085A true CN106291085A (en) | 2017-01-04 |
| CN106291085B CN106291085B (en) | 2019-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610899965.8A Active CN106443155B (en) | 2012-03-15 | 2012-03-15 | Power transformer near region short circuit monitoring method |
| CN201610900108.5A Active CN106501588B (en) | 2012-03-15 | 2012-03-15 | A kind of short-circuit current of near zone of transformer monitoring method |
| CN201610899333.1A Active CN106291084B (en) | 2012-03-15 | 2012-03-15 | A kind of power transformer near region short circuit monitoring method |
| CN201610900109.XA Active CN106526300B (en) | 2012-03-15 | 2012-03-15 | Short-circuit current of near zone of transformer real-time monitoring device |
| CN201610900110.2A Active CN106291085B (en) | 2012-03-15 | 2012-03-15 | Short-circuit current of near zone of transformer monitoring method |
Family Applications Before (4)
| Application Number | Title | Priority Date | Filing Date |
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| CN201610899965.8A Active CN106443155B (en) | 2012-03-15 | 2012-03-15 | Power transformer near region short circuit monitoring method |
| CN201610900108.5A Active CN106501588B (en) | 2012-03-15 | 2012-03-15 | A kind of short-circuit current of near zone of transformer monitoring method |
| CN201610899333.1A Active CN106291084B (en) | 2012-03-15 | 2012-03-15 | A kind of power transformer near region short circuit monitoring method |
| CN201610900109.XA Active CN106526300B (en) | 2012-03-15 | 2012-03-15 | Short-circuit current of near zone of transformer real-time monitoring device |
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| CN111489099A (en) * | 2020-04-23 | 2020-08-04 | 国网江西省电力有限公司电力科学研究院 | On-site operation risk assessment method for short-circuit resistance of transformer |
| CN111983350A (en) * | 2020-08-11 | 2020-11-24 | 云南电网有限责任公司电力科学研究院 | Method for analyzing current impact on power transformer |
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| CN106597181B (en) * | 2017-02-13 | 2023-06-02 | 云南电网有限责任公司电力科学研究院 | Operation monitoring system and method for high-voltage power transformer |
| CN107102195B (en) * | 2017-04-26 | 2020-03-20 | 顺特电气设备有限公司 | Electric quantity processing and network transmission method of intelligent transformer terminal |
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| CN111880020A (en) * | 2020-04-27 | 2020-11-03 | 深圳华工能源技术有限公司 | Fault recording data generation method and device for power distribution and utilization system of power consumer |
| CN112816917B (en) * | 2021-04-16 | 2021-07-13 | 成都工百利自动化设备有限公司 | Transformer impact monitoring device |
| CN113985135A (en) * | 2021-11-01 | 2022-01-28 | 成都府河电力自动化成套设备有限责任公司 | Transformer short circuit impact on-line monitoring device and monitoring method |
| CN116522739B (en) * | 2023-06-29 | 2023-09-26 | 南昌科晨电力试验研究有限公司 | Transformer short-circuit impact control method and system based on data analysis |
| CN116665425B (en) * | 2023-08-02 | 2023-10-10 | 山西阳风新能售电有限公司 | Monitoring and early warning method and system for power supply |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106501588B (en) | 2019-06-11 |
| CN106443155A (en) | 2017-02-22 |
| CN102565524A (en) | 2012-07-11 |
| CN106291084B (en) | 2019-03-15 |
| CN106291085B (en) | 2019-04-02 |
| CN106526300A (en) | 2017-03-22 |
| CN106443155B (en) | 2019-04-02 |
| CN106501588A (en) | 2017-03-15 |
| CN106291084A (en) | 2017-01-04 |
| CN106526300B (en) | 2019-07-09 |
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