CN106501588A - A kind of short-circuit current of near zone of transformer monitoring method - Google Patents
A kind of short-circuit current of near zone of transformer monitoring method Download PDFInfo
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- CN106501588A CN106501588A CN201610900108.5A CN201610900108A CN106501588A CN 106501588 A CN106501588 A CN 106501588A CN 201610900108 A CN201610900108 A CN 201610900108A CN 106501588 A CN106501588 A CN 106501588A
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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
- 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
-
- 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, the three-phase noninductive resistance concatenated on the threephase current transformer of Circuit Fault on Secondary Transformer is by the analogue signal for gathering through signal through isolated amplifier, low pass filter, absolute value converting unit and range self-adapting unit deliver to A/D sampling units, A/D sampling unit continuous acquisition analogue signals, first processor carries out computing to the current sampling data for reading, screening obtains the failure instantaneous value of the current effective value and jump-value of current of waveform, the fault data that failure occurs the moment is cached in dual-ported memory, second processing device receives the fault data of dual-ported memory and draws oscillogram through network interface with host computer communication, second processing device is counted and is stored into jumbo memorizer to the fault data for receiving simultaneously.The present invention is acquired, records and analyzes to Short Circuit Fault on Secondary Transformer dash current, can be that transformer station high-voltage side bus status analysis and maintenance provide accurate foundation.
Description
The application is Application No.：201210068241.0, invention and created name is《Short-circuit current of near zone of transformer is real-time
Monitoring method》, the applying date is：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, belongs to short-circuit current of near zone of transformer prison
Survey technology field.
Background technology
Nucleus equipment of the power transformer as electrical network, the safe and reliable operation to electrical network are most important.Only to transformation
The failure of device is accurately analyzed and is judged, can just take in time and effectively treatment measures, it is ensured that the normal operation of electrical network and
Normal power supply to user.110kV transformators low-pressure side be subjected to terminal short-circuit, near region short circuit after, Transformer Winding can be born
Sizable electric current, affects its health status；Short circuit current flow all can form build-up effect to Transformer Winding every time, be formed latent
Volt property corrupted, therefore transformator near region short circuit is a necessary detection project.And at present for the inspection of transformator near region short circuit
Survey is using measuring transformer insulation resistance, while comprehensive Chromatographic Analysis of Transformer oil is judging overheating fault and the electric discharge of inside
Property failure, and determine the order of severity of failure and general position, it is possible to find fault severity level after the short circuit of transformator near region,
So as to propose corresponding anti-accident measures.But above-mentioned detection of complex, due to providing Short Circuit Fault on Secondary Transformer surge
The size and number of shocks of amount, therefore can not be accurately that transformer station high-voltage side bus status analysis and maintenance provide foundation.
Content of the invention
It is an object of the invention to provide one kind can be acquired to Short Circuit Fault on Secondary Transformer dash current, record and divide
Analysis, for transformer station high-voltage side bus status analysis and can overhaul the short-circuit current of near zone of transformer monitoring method for providing accurate foundation.
The present invention is that the technical scheme for reaching above-mentioned purpose is：A kind of short-circuit current of near zone of transformer monitoring method, its are special
Levy and be：Three-phase noninductive resistance is serially connected with the threephase current transformer of Circuit Fault on Secondary Transformer respectively, and three-phase noninductive resistance will be adopted
The analogue signal of collection carries out isolation amplification through signal isolation amplifier, filters the high frequency division in analogue signal through low pass filter
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, will collection analogue signal amplify after deliver in A/D sampling units, A/D samplings are single
Unit is converted into transporting to first processor after digital signal to continuous acquisition analogue signal, current sample of the first processor to reading
Data carry out computing, screen and obtain the failure instantaneous value of the current effective value and jump-value of current of waveform, by current effective value
And the characteristic quantity that the failure instantaneous value of jump-value of current is triggered as data record, when an any of the above described characteristic quantity is met it is
At the moment that failure occurs, the fault data that failure occurs the moment is cached in dual-ported memory, second processing device receives both-end
The fault data of mouth memorizer simultaneously passes through network interface and host computer communication, and host computer receives fault data and simultaneously draws waveform to becoming
Depressor near region short circuit current flow carries out real-time monitoring, while second processing device is counted to the fault data for receiving and is stored into big
The memorizer of capacity.
The current effective value is the current value of 1ms-20ms time intervals and load current in 0.1A～5A.
The failure instantaneous value of the jump-value of current is that load current of the persistent period between 100ms to 1s is more than 50A
Current value.
The present invention is measurement unit by the three-phase noninductive resistance being connected on each phase current mutual inductor of Circuit Fault on Secondary Transformer
Part, therefore can be to flowing through the electric current real-time monitoring of Transformer Winding, and noninductive resistance does not have shadow to secondary loop of mutual inductor
Ring, isolation amplification is carried out to the analogue signal on noninductive resistance by isolated amplifier, then signal is filtered through low pass filter
In high fdrequency components, exchange is converted to by direct current by absolute value converting unit, can be according to input by range adaptive unit
Collection signal is amplified and delivers to A/D sampling units and sampled by the amplitude automatic switching range of signal, and first processor is to fixed
When the data that obtain carry out the screening of computing, obtain the virtual value and failure instantaneous value of waveform, and by current effective value and electric current
Two characteristic quantities that the failure instantaneous value of Sudden Changing Rate is triggered as data record, when any one characteristic quantity can determine that failure occurs
Moment, by failure occur the moment fault data 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 flow after becoming surely can be caught, with preferable stable state and transient performance, the present invention is in collection transformator two
Secondary side is normal and failure condition under current waveform real time data, fault data is cached in dual-ported memory, second processing
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
Shape carries out real-time monitoring to short-circuit current of near zone of transformer so that the monitoring more intuitive and convenient to short circuit current flow, while passing through
Second processing device counts fault data, and event current maxima, the size of rush of current amount and impact time occur to run duration
Number and the fault data such as attack time are counted, for Condition Maintenance Method of Transformer decision system provide strong data foundation with
Support.The present invention carries out computing and screening by first processor to sampled data, fault data is entered by second processing device
Row statistics and communication, monitoring system are stable, and functional reliability is good, and integrated level is high, can meet onsite application demand.
Description of the drawings
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.
Specific embodiment
As shown in Fig. 1,2, 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
Three-phase noninductive resistance is serially connected with transformer respectively, and the analogue signal of collection is entered by three-phase noninductive resistance through signal isolation amplifier
Row isolation is amplified, and filters the high fdrequency components in analogue signal and the conversion of absolute value converting unit through low pass filter, 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
Automatic range switching is carried out, analogue signal is amplified in a suitable scope, delivered to after the analogue signal of collection is amplified
In A/D sampling units, A/D sampling units are converted into transporting to first processor after digital signal to continuous acquisition analogue signal, the
One processor carries out computing to the current sampling data for reading, can be using the most frequently used instrument when being analyzed to signal and processing
One of fast Fourier transformation operation, screen and obtain the failure instantaneous value of the current effective value and jump-value of current of waveform,
The characteristic quantity that the failure instantaneous value of current effective value and jump-value of current is triggered as data record, meets any one feature
Amount determines the moment that failure occurs, and the fault data that failure occurs the moment is cached in dual-ported memory, and current effective value is
The current value of 1ms-20ms time intervals and load current in 0.1A～5A, and the failure instantaneous value of jump-value of current is lasting
Current value of load current of the time between 100ms to 1s more than 5A～50A, to the current break logout ripple for occurring
Shape, virtual value and time of origin fault data, second processing device receive the fault data of dual-ported memory and pass through network
Interface and host computer communication, host computer receive fault data and draw waveform and short-circuit current of near zone of transformer is supervised in real time
Survey, while second processing device is counted and be stored into jumbo memorizer, second processing device pair to the fault data for receiving
Event current maxima, the size of rush of current amount and number of shocks and attack time fault data occur to run duration is carried out
Statistics, can carry out data interaction by jumbo memorizer and Managing system of above position machine, Short Circuit Fault on Secondary Transformer is 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, and are transformator
Decision-making of Condition-based Maintenance system provides strong data foundation and support.
As shown in Fig. 1,2, 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, the noninductive resistance is using four pin configurations without electrification
Hinder, not only small volume, resistance is optional, signal processing circuit is simple, certainty of measurement is high, does not have shadow to secondary loop of mutual inductor
Ring, it is adaptable to secondary circuit transformation feature.Signal isolation amplifier that the signal gathering unit of the present invention includes being sequentially connected, low
Bandpass filter, absolute value converting unit and range self-adapting unit and A/D collecting units, are serially connected in Circuit Fault on Secondary Transformer respectively
Threephase current transformer on three-phase noninductive resistance connect the input of signal isolation 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 adopt ISO series isolated amplifiers, on noninductive resistance
Analogue signal carry out isolation amplification, the low pass filter of the present invention can adopt RC low pass filters, filter through low pass filter
Except the high fdrequency components in signal, exchange can be converted to direct current using absolute value transducer by absolute value converting unit, and by the
Self adaptation range switching is carried out under the control of the complex programmable logic device (CPLD) in one processor, and signal is amplified to one
The sampling of A/D sampling units is delivered in suitable scope, and the optional DTE3216 collection plates of A/D sampling units are adopted with 16 100KHz
The A/D converter of sample rate, samples to normal load current waveform and fault current waveform two-forty.
As shown in Fig. 1,2, the CPU of the present invention is included at first to signals collecting computing and screening
Manage device, dual-ported memory and for the second processing device to data statisticss and communication, dual-ported memory passes through data/address bus
It is connected with first processor and second processing device respectively, dual-ported memory can adopt IDT70V9289, first processor to adopt
Dsp processor, dsp processor can select TMS320F2812, and TMS320F2812 is the C2000 platforms that TI companies of the U.S. release
On 32 bit DSP chip of fixed point, its run clock may be up to 150MHz, process performance up to 150MIPS, for 128: 32
The fft algorithm of position real number（Q30）, the execution time only needs 6763 instruction cycles, arithmetic speed superior performance, second processing device to adopt
With arm processor, arm processor can be using the LPC2220 microprocessors of Phillips, and LPC2220 microcontrollers are one
Hold 32/16 ARM7TDMI-S CPU of real-time simulation and embedded tracking, the encapsulation of 144 feet, extremely low power consumption, multiple 32 bit timings
Device, 8 tunnel 10 ADC, PWM output and up to 9 external interrupt pins, have small-sized, quick, low energy consumption, in integrated form RISC
The features such as core.The input of the output termination first processor of A/D collecting units of the present invention, electric current of the first processor to reading
Sampled data carries out the i.e. FFT computings of fast Fourier transform, the characteristic quantity triggered as data record using jump-value of current and with
The characteristic quantity that current effective value is triggered as data record, determines that by two characteristic quantities the moment that failure occurs carries out short circuit
Differentiate, screening obtains the failure instantaneous value of the current effective value and jump-value of current of waveform, and the fault data for filtering out is cached
Second processing device is then sent through 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 are passed by network interface
To host computer and waveform is drawn, directly short circuit current flow is monitored, the network interface can adopt Ethernet interface, second processing device
It is connected with mass storage by PORT COM, the Ethernet interface of the present invention adopts DM9000AE chips, and the chip volume is little,
There is AUTO-Midx (supporting direct interconnection automatic turning) TCP/IP to accelerate function, its access time is 20nsl/o, can mitigate
The burden of second processing device, effectively improves the efficiency of whole device.PORT COM of the present invention is connected with mass storage, and second
Processor is counted and is stored into the fault data for receiving jumbo memorizer, and second processing device occurs to run duration
Event current maxima, number of times fault data are counted, the exchange for realizing local data by jumbo memorizer, or with
Managing system of above position machine carries out data interaction.
Claims (1)
1. a kind of short-circuit current of near zone of transformer monitoring method, it is characterised in that：
Three-phase noninductive resistance be serially connected with the threephase current transformer of Circuit Fault on Secondary Transformer respectively, and three-phase noninductive resistance will be gathered
Analogue signal carries out isolation amplification through signal isolation amplifier, through low pass filter filter the high fdrequency components in 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 units, A/D sampling units pair after the analogue signal of collection is amplified
Continuous acquisition analogue signal transports to first processor, current sampling data of the first processor to reading after being converted into digital signal
Computing is carried out, the failure instantaneous value of the current effective value and jump-value of current of waveform is screened and obtain, by current effective value and electricity
The characteristic quantity that trigger as data record of failure instantaneous value of stream Sudden Changing Rate, determined by two characteristic quantities failure generation when
Quarter carries out short circuit discrimination, and the fault data that failure occurs the moment is cached in dual-ported memory, and second processing device receives both-end
The fault data of mouth memorizer simultaneously passes through network interface and host computer communication, and host computer receives fault data and simultaneously draws waveform to becoming
Depressor near region short circuit current flow carries out real-time monitoring, while second processing device is counted to the fault data for receiving and is stored into big
The memorizer of capacity；
Wherein, isolated amplifier carries out isolation amplification using ISO series isolated amplifiers to the analogue signal on noninductive resistance,
Low pass filter filters the high fdrequency components in signal, absolute value converting unit using RC low pass filters through low pass filter
Exchange can be converted to by direct current using absolute value transducer, and by the complex programmable logic device (CPLD) in first processor
Control under carry out self adaptation range switching, signal is amplified in a suitable scope deliver to A/D sampling units sampling, A/
D sampling units select DTE3216 collection plates, the A/D converter with 16 100KHz sample rates, to normal load current waveform and
Fault current waveform two-forty is sampled；
First processor carries out the i.e. FFT computings of fast Fourier transform to the current sampling data for reading；
The failure instantaneous value of the jump-value of current is electricity of load current of the persistent period between 100ms to 1s more than 50A
Flow valuve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610900108.5A CN106501588B (en) | 2012-03-15 | 2012-03-15 | A kind of short-circuit current of near zone of transformer monitoring method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610900108.5A CN106501588B (en) | 2012-03-15 | 2012-03-15 | A kind of short-circuit current of near zone of transformer monitoring method |
| CN201210068241.0A CN102565524B (en) | 2012-03-15 | Real-time monitoring method for short-circuit current of near zone of transformer |
Related Parent Applications (1)
| 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 |
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| CN106501588A true CN106501588A (en) | 2017-03-15 |
| CN106501588B CN106501588B (en) | 2019-06-11 |
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| 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 |
| 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 |
| CN201610899965.8A Active CN106443155B (en) | 2012-03-15 | 2012-03-15 | Power transformer near region short circuit monitoring method |
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| 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 |
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| CN201610899333.1A Active CN106291084B (en) | 2012-03-15 | 2012-03-15 | A kind of power transformer near region short circuit monitoring method |
| CN201610899965.8A Active CN106443155B (en) | 2012-03-15 | 2012-03-15 | Power transformer near region short circuit monitoring method |
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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 |
| CN110794331B (en) * | 2019-11-12 | 2021-05-04 | 西南交通大学 | Track traffic traction transformer turn-to-turn short circuit detection and protection device |
| CN111489099B (en) * | 2020-04-23 | 2022-10-11 | 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 |
| 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 |
| CN111983350B (en) * | 2020-08-11 | 2022-09-02 | 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 |
| 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 |
|---|---|
| CN106526300A (en) | 2017-03-22 |
| CN106291085A (en) | 2017-01-04 |
| CN102565524A (en) | 2012-07-11 |
| CN106291084A (en) | 2017-01-04 |
| CN106291085B (en) | 2019-04-02 |
| CN106291084B (en) | 2019-03-15 |
| CN106443155A (en) | 2017-02-22 |
| CN106526300B (en) | 2019-07-09 |
| CN106501588B (en) | 2019-06-11 |
| CN106443155B (en) | 2019-04-02 |
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