CN109143143A - Transformer substation current transformer secondary side polarity intelligent detection device and method - Google Patents
Transformer substation current transformer secondary side polarity intelligent detection device and method Download PDFInfo
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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
- 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
- G01R31/72—Testing of electric windings
Abstract
The invention discloses a kind of transformer substation current transformer secondary side polarity intelligent detection device and methods, including verification host and multiple acquisition terminals；The verification host includes first human-computer interaction module, supervisor module, acquisition recording module, ac current source, inside CT and radio receiving transmitting module；The supervisor module is connect with first human-computer interaction module, ac current source, radio receiving transmitting module and acquisition recording module respectively；Ac current source exports electric current by parallel with tested CT after internal CT primary side；Internal CT secondary side connection acquisition recording module.The present invention can test out the correctness of secondary side circuit, and high-efficient.
Description
Technical field
The invention belongs to transforming plant primary experimental technique fields, and in particular to a kind of secondary side pole of transformer substation current transformer
Property intelligent detection device and method.
Background technique
In traditional substation, secondary current, voltage circuit carry key player.As transforming plant protecting and observing and controlling system
The signal source of system, secondary current, voltage circuit provide measurement and protective current voltage signal to transforming plant protecting measuring system, real
Now to Operation of Electric Systems monitoring and defencive function.Therefore, each electric current in substation, voltage secondary circuit wiring correctness for
Substation's reliability service, which has, to be directly affected.When secondary current, voltage circuit are there are when wiring error or defect, it is easy to cause
Transforming plant protecting device malfunction or tripping reduce substation's power supply reliability.Also, once there is CT (current transformer) open circuit
Phenomenon is easy to cause equipment damage and personal injury.Therefore, for traditional substation, it is put into operation in new website or transformation station
When change that is preceding or being related to CT secondary circuit changes occasion, it is necessary to each group electric current secondary loop in substation before power transmission
It is gone through and is tested, to ensure that each current loop connection is correct.The polarity of current transformer refers to electric current at a certain moment
It is positive in the current direction of primary and secondary side or is negative simultaneously simultaneously, the polarity is referred to as Same Name of Ends or same polarity in such cases
End.
The ac current source that primary through-flow method needs generallys use the principles such as station electricity consumption, current lifting device and Switching Power Supply, wherein
220V single-phase alternating current or 380V three-phase alternating current of the electricity consumption in station of standing can only generally be used to since voltage is non-adjustable
CT polarity as transformer verifies, and operating current is determined by transformer impedance, also non-adjustable, thus use scope by
Limitation.
The advantages of current lifting device and Switching Power Supply are provided with current adjustment, the former uses automatic coupling voltage regulator principle, by high pressure, small
Electric current input transformation journey low pressure, High-current output, but it exports electric current by the variation of network voltage and the shadow of load change
Sound is larger, during test, once discovery abnormality, it is possible to lead to electric current change dramatically, endangers power grid security；The latter
It is made of a large amount of semiconductor element, switch electricity (is mainly formed with multichannel field-effect tube by main power circuit, switching circuit
Road, complete rectification and current regulation function), trigger circuit and controlling power circuit composition, have Energy Efficiency Ratio height, it is small in size, weight
The features such as amount is light, output voltage stabilization, but since output control object remains as voltage, still by the shadow of load change
It rings.
In addition, the above several method all have the shortcomings that one it is common, that is, be all work under equilibrium mode, can only
The polar correlation between multiple CT is verified, can not judge the polar correctness of single CT, and this is needed first and second
Electric current synchronizes acquisition, is more just able to achieve.Currently, there are two ways to realizing synchronous acquisition, the first is by first and second
Electric current accesses same measuring device, but is limited by distance, and test connection is too long, increases the difficulty of field application；
Second using the Time synchronization techniques such as GPS, B code, but GPS technology will receive the limitation of signal strength, indoors almost without
Method uses, and B code technology needs time synchronism apparatus wiring in slave station, and wiring process is still comparatively laborious.
Therefore, it is necessary to develop a kind of transformer substation current transformer secondary side polarity intelligent detection device and method.
Summary of the invention
The object of the present invention is to provide a kind of transformer substation current transformer secondary side polarity intelligent detection device and method, energy
Quickly test out the correctness of secondary side circuit.
Unit transformer substation current transformer secondary side polarity intelligent detection device of the present invention, including verification host and
Multiple acquisition terminals；
The verification host include first human-computer interaction module, supervisor module, acquisition recording module, ac current source,
Internal CT and radio receiving transmitting module；The supervisor module respectively with first human-computer interaction module, ac current source, wireless receiving and dispatching
Module is connected with acquisition recording module；Ac current source exports electric current by parallel with tested CT after internal CT primary side；It is interior
Portion's CT secondary side connection acquisition recording module；
Wherein, the first human-computer interaction module is for configuring testing scheme, input parameter, test process monitoring, checking
Waveform and check test report；
The ac current source is for exporting 0A~200A alternating current；
The radio receiving transmitting module is for realizing the communication between supervisor module and acquisition terminal；
The acquisition terminal is used to acquire the secondary loop current of tested CT, generates the first recorded wave file and is transferred to management
Machine module；
The acquisition recording module is used to acquire the primary circuit electric current of tested CT, generates the second recorded wave file and is transferred to
Supervisor module；
The supervisor module is used to analyze with the first recorded wave file and the second recorded wave file when primary test, and judges
The polar correctness of CT out.
Further, the acquisition terminal includes forcipated mutual-inductor module, processing module, communication module, the second human-computer interaction
Module and acquisition module；The forcipated mutual-inductor module is electrically connected with acquisition module；The acquisition module, communication module and second
Human-computer interaction module is electrically connected with processing module respectively.
Further, the acquisition module includes aviation plug, 5 times of attenuator circuits, two-stage amplifying circuit and analog-to-digital conversion core
Piece；
5 times of attenuator circuits include resistance R3, resistance R4, resistance R7, resistance R8 and analog switch U1, resistance R8 and mould
It is in parallel with resistance R7 after quasi- switch U1 series connection, then connect with resistance R3, resistance R4；
Two-stage amplifying circuit includes first order amplifying circuit and second level amplifying circuit, in which:
First order amplifying circuit includes resistance R5, resistance R6, resistance R9, capacitor C1 and operational amplifier U2；Resistance R5's
One end ground connection, the other end of resistance R5 are connect through resistance R6 with the inverting input terminal of operational amplifier U2；One end of capacitor C1 with
The inverting input terminal of operational amplifier U2 connects, and the other end of capacitor C1 is connect with the output end of operational amplifier U2, resistance R9
It is in parallel with capacitor C1；
Second level amplifying circuit includes resistance R10, resistance R11, resistance R12, capacitor C2 and operational amplifier U3；Resistance
One end of R10 is grounded, and the other end of resistance R10 is connect through resistance R11 with the inverting input terminal of operational amplifier U3；Capacitor C2
One end connect with the inverting input terminal of operational amplifier U3, the output end of the other end of capacitor C2 and operational amplifier U3 connect
It connects, resistance R12 and capacitor C2 are in parallel.
A kind of transformer substation current transformer secondary side polarity intelligent detection method of the present invention, using institute such as of the present invention
The transformer substation current transformer secondary side polarity intelligent detection device stated, detection method includes the following steps:
Host output primary current is verified by the primary circuit of tested CT, using acquisition terminal in the secondary side for being tested CT
The upper secondary loop current for acquiring tested CT, generates the first recorded wave file and is transferred to supervisor module；
The inside CT that the primary circuit electric current of tested CT is verified host is sent into acquisition recording module, generates the second recording text
Part is simultaneously transferred to supervisor module；
Supervisor module analyzes the first recorded wave file and the second recorded wave file, and judges automatically out tested CT polarity
Correctness.
Further, the primary current for giving tested CT to be passed through aA by ac current source, start-phase are b °；
It is sampled using acquisition terminal with secondary loop current of the preset sample frequency to tested CT, every millisecond from current
Sampled point takes forward k sampled point to calculate secondary current virtual value, and is converted according to the no-load voltage ratio of tested CT to primary current, when one
When primary current Sudden Changing Rate is preset threshold, k sampled point is taken backward from current sampling point, calculate current sampling point primary current
Otherwise phase determines quilt if phase in pre-set interval, determines that the polarity in first and second circuit of tested CT is positive polarity
The polarity for surveying first and second circuit of CT is negative polarity.
Further, tested CT is given to be passed through 200A primary current by ac current source, start-phase is 0 °；
It is sampled using acquisition terminal with secondary loop current of the 10kHz sample frequency to tested CT, every millisecond from working as
Preceding sampled point takes forward 200 sampled points to calculate secondary current virtual value, and is converted according to the no-load voltage ratio of tested CT to primary current,
When primary current Sudden Changing Rate isWhen, it takes 200 sampled points backward from current sampling point, it is primary to calculate current sampling point
The phase of electric current, if phase at (90 °, 270 °) section, then determines that the polarity in first and second circuit of tested CT is anode
Property, otherwise determine that the polarity in first and second circuit of tested CT is negative polarity.
Further, further includes: judge the method for tested CT no-load voltage ratio, specifically:
The secondary loop current of tested CT is acquired using acquisition terminal；
The no-load voltage ratio of tested CT is equal to the output current value of ac current source and the ratio of secondary loop current.
Beneficial effects of the present invention: it can not only test out the correctness of secondary side circuit, additionally it is possible to provide last
Rectification scheme, so that entire detection more intelligence and conveniently, effectively increases test efficiency, test period is greatly saved.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the functional block diagram of acquisition terminal in the present invention；
Fig. 3 is the circuit diagram of acquisition module in the present invention；
Fig. 4 is the schematic diagram of delay measurements Time synchronization algorithm in the present invention.
In figure: 1, host, 1a, first human-computer interaction module are verified, 1c, 1b, supervisor module acquire recording module,
1d, ac current source, 1e, inside CT, 1f, radio receiving transmitting module, 2, tested CT, 3, acquisition terminal, 3a, forcipated mutual-inductor mould
Block, 3b, processing module, 3c, communication module, 3d, the second human-computer interaction module, 3e, acquisition module.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
Such as Fig. 1 unit transformer substation current transformer secondary side polarity intelligent detection device of the present invention, including verification
Host 1 and multiple acquisition terminals 3.Wherein, the acquisition terminal 3 is used to acquire the secondary loop current of tested CT2, generates the
One recorded wave file is simultaneously transferred to supervisor module 1b.
As shown in Fig. 2, the verification host 1 includes first human-computer interaction module 1a, supervisor module 1b, acquisition recording mould
Block 1c, ac current source 1d, inside CT1e and radio receiving transmitting module 1f；The supervisor module 1b respectively with the first human-computer interaction
Module 1a, ac current source 1d, radio receiving transmitting module 1f are connected with acquisition recording module 1c；Ac current source 1d exports electric current
By in parallel with tested CT2 after internal CT1e primary side；Internal CT1e secondary side connection acquisition recording module 1c.
Each module of verification host 1 is described in detail below:
(1) first human-computer interaction module
The operation interface of user monitors for configuring testing scheme, input parameter, test process, checks waveform, checks survey
Examination report etc..In the present embodiment, first human-computer interaction module 1a includes liquid crystal display, keyboard and singly-bound shuttle；Wherein, liquid crystal display
The JLT10001A of Jing Litai Science and Technology Ltd. of model Shenzhen, the Jian Te Electronics Co., Ltd. of model Shenzhen of keyboard
M160HP, the LUYEE5000D of the Ying Long Electronics Co., Ltd. of model Shenzhen of singly-bound shuttle.
(2) ac current source
For exporting 0~200A alternating current, in the present embodiment, the model APEX company of ac current source 1d
MF111D。
(3) radio receiving transmitting module
Conversion and control for the cable data and wireless data that are communicated between supervisor module 1b and external environment.This
In embodiment, the ME909S-821 of model Huawei of radio receiving transmitting module 1f.
(4) recording module is acquired
The tested primary circuit CT2 electric current is acquired by internal CT1e (i.e. current transformer), generates the second recorded wave file simultaneously
It is transferred to supervisor module 1b.In the present embodiment, the AD7606 of the model ADI company of recording module 1c is acquired.
(5) internal CT
Electric current for exporting ac current source 1d is converted to the acquisition manageable small voltage of recording module 1c, this reality
It applies in example, the TBD-200A/3.53 of the model ADI company of inside CT1e.
(6) supervisor module
For completing all background functions, including the analysis of data communication, data, data storage etc..The supervisor module
1b is used to analyze with the first recorded wave file and the second recorded wave file when primary test, and judges the polar correctness of CT.
In the present embodiment, the QA3/N2807 of the spy Science and Technology Ltd. of model Konka of the supervisor module 1b.
(1) supervisor module 1b is communicated by radio receiving transmitting module 1f with acquisition terminal 3, for passing tested CT2 down
Secondary loop current starts definite value, first recorded wave file of reception etc..
(2) supervisor module 1b is communicated with acquisition recording module 1c, and the tested primary circuit CT2 electric current is passed under and is opened
Dynamic definite value, second recorded wave file of reception etc..
(3) supervisor module 1b is communicated with ac current source 1d, for starting/stopping output, setting output electric current
Deng.
(4) supervisor module 1b is communicated with first human-computer interaction module 1a, and user passes through first human-computer interaction module
The mode of connection, starting definite value, no-load voltage ratio is arranged in 1a, checks recorded wave file, test report etc..
As shown in Fig. 2, the acquisition terminal 3 includes forcipated mutual-inductor module 3a, processing module 3b, communication module 3c, the
Two human-computer interaction module 3d and acquisition module 3e；The forcipated mutual-inductor module 3a is electrically connected with acquisition module 3e；The acquisition
Module 3e, communication module 3c and the second human-computer interaction module 3d are electrically connected with processing module 3b respectively.
Each module is described in detail below:
(1) forcipated mutual-inductor module
For in the case where not turning off original circuit, secondary loop of mutual inductor electric current to be converted to acquisition module 3e
Manageable small voltage.
In the present embodiment, the model Q8B-5, range 5A, no-load voltage ratio 2000:1 of the forcipated mutual-inductor module 3a.
(2) acquisition module
For acquiring secondary loop of mutual inductor electric current, generating first into recorded wave file and being transferred to processing module 3b.
In the present embodiment, since secondary side signal is smaller, acquisition module 3e is carried out firstly the need of to data collected
Enhanced processing.But secondary side signal has many interference high-frequency signals after enhanced processing, in signal, has to data processing very much
Interference, will lead to detection device cannot correctly judge polarity correctness, therefore also need to be filtered data.Filter
Wave device can be divided into low pass, band logical and high-pass filter from working frequency, can continue for filter to be divided into from performance bar
Te Wozi, Chebyshev, Bezier etc., what the primary side of this detection device was passed through is power frequency 50Hz alternating current, belongs to low frequency, is become
The interference of power station scene is mainly High-frequency Interference, therefore uses low-pass filter.Meanwhile butterworth filter has good width
Frequency characteristic, what is used in practice is most, and in the present embodiment, the filtering part of acquisition module 3e is fertile hereby using second order Bart
Low-pass filter.After acquisition module 3e amplifies filtering processing to data collected, high-frequency signal in signal base
This is filtered.
What current transformer primary side was passed through is power frequency 50Hz signal, but signal frequency is not fixed and invariable, and can be produced
Raw certain floating, therefore, the present embodiment devises adaptive frequency track algorithm for signal frequency variation, when frequency changes
When, data also can be accurately acquired, ensure that the precision of data acquisition.Adaptive frequency track algorithm specifically: logical first
It crosses quick Fourier transform pairs signal to be handled, calculates the frequency f of input signalc, it is assumed that each periodic sampling point of signal
Number is n, so sampling number frequency interval f every timec=fc/ n, when the frequency of input changes as fc1, then each sampled point
Number frequency becomes fc1=fc1/ n, then according to the interval of the sampling interval frequency adjustment A/D sampling after variation, to guarantee every
Sampling number in a period is identical, ensure that the precision of sampling, and will not change because of frequency leads to sampled point in a cycle
Number not enough, affects the accuracy of final data.
As shown in figure 3, the physical circuit of the acquisition module 3e is as follows: acquisition module 3e includes aviation in the present embodiment
Plug, 5 times of attenuator circuits, two-stage amplifying circuit and modulus conversion chip, modulus conversion chip model AD7606BSTZ.Its
In, 5 times of attenuator circuits include resistance R3, resistance R4, resistance R7, resistance R8 and analog switch U1, resistance R8 and analog switch U1
It is in parallel with resistance R7 after series connection, then connect with resistance R3, resistance R4, resistance R3 is grounded through resistance R2, and resistance R3 is also through resistance
R1 ground connection.Two-stage amplifying circuit includes first order amplifying circuit and second level amplifying circuit, in which: first order amplifying circuit includes
Resistance R5, resistance R6, resistance R9, capacitor C1 and operational amplifier U2；One end of resistance R5 is grounded, and the other end of resistance R5 is through electricity
Resistance R6 is connect with the inverting input terminal of operational amplifier U2；One end of capacitor C1 and the inverting input terminal of operational amplifier U2 connect
It connects, the other end of capacitor C1 is connect with the output end of operational amplifier U2, and resistance R9 and capacitor C1 are in parallel.Second level amplifying circuit
Including resistance R10, resistance R11, resistance R12, capacitor C2 and operational amplifier U3；One end of resistance R10 is grounded, resistance R10's
The other end is connect through resistance R11 with the inverting input terminal of operational amplifier U3；One end of capacitor C2 is anti-with operational amplifier U3's
The connection of phase input terminal, the other end of capacitor C2 are connect with the output end of operational amplifier U3, and resistance R12 and capacitor C2 are in parallel.This
In embodiment, the resistance value of the resistance R3 and resistance R4 are 2.2k Ω, and the resistance value of resistance R7 is 200k Ω, and the resistance value of resistance R8 is
1.1kΩ.The resistance R5, resistance R6, resistance R10 and resistance R11 resistance value be 10 Ω, the resistance of resistance R9 and resistance R12
Value is that the capacitance of 15k Ω, capacitor C1 and capacitor C2 are 3.3pF.
In the present embodiment, it is grounded after the model ADG541BCPZ-RL7,7 foot meridian capacitor C14 of analog switch, 6 feet
It is followed by power supply through resistance R13, is grounded after 4 foot meridian capacitor C3.
In the present embodiment, the model AD7606BSTZ of the modulus conversion chip, 3 feet of modulus conversion chip are through resistance
R14 ground connection, 4 feet are grounded after resistance R15, and 5 feet are grounded after resistance R16, and 6 feet are followed by power supply through resistance R17,
It is grounded, is grounded after 42 foot meridian capacitor C13 feet, the tie point of 44 feet and 45 feet is followed by through capacitor C11 after 23 foot meridian capacitor C12
Ground is grounded after 39 foot meridian capacitor C10, is grounded after 36 foot meridian capacitor C9,1 foot, 37 feet, 38 feet and 48 feet tie point
It is grounded after capacitor C4, capacitor C5 is in parallel with capacitor C4, and capacitor C6 is in parallel with capacitor C5, and capacitor C7 is in parallel with capacitor C6, capacitor
C8 is in parallel with capacitor C7.33 feet of modulus conversion chip are grounded after resistance R18, and 25 feet are connect with resistance R19,24 feet with
Resistance R20 connection.
(3) processing module
For completing phase calculation and polarity arbitration functions.
In the present embodiment, the XC7Z20-L1CLG484I of the model match company of Sentos of the processing module 3b.
(4) second human-computer interaction modules
The operation interface of user monitors for configuring testing scheme, input parameter, test process, checks waveform, checks survey
Examination report etc..
In the present embodiment, the second human-computer interaction module 3d includes key and 5 cun of display screens.
(5) communication module
For being communicated between processing module 3b and external equipment, conversion and control including cable data and wireless data.
In the present embodiment, the communication module 3c uses the wire communication module 3c and type of RS485 interface chip MAX3442
Number be F8L10D-E-433 wireless communication module.
A kind of transformer substation current transformer secondary side polarity intelligent detection method of the present invention, using institute such as of the present invention
The transformer substation current transformer secondary side polarity intelligent detection device stated, detection method includes the following steps:
It verifies host 1 and exports primary current by the primary circuit of tested CT2, using acquisition terminal 3 the two of tested CT2
The secondary loop current that tested CT2 is acquired on secondary side generates the first recorded wave file and is transferred to supervisor module 1b；
The inside CT1e that the primary circuit electric current of tested CT2 is verified host 1 is sent into acquisition recording module 1c, generates second
Recorded wave file is simultaneously transferred to supervisor module 1b；
Supervisor module 1b analyzes the first recorded wave file and the second recorded wave file, and judges automatically out tested CT2
Polar correctness.
In the present embodiment, tested CT2 is given to be passed through aA's (being illustrated by taking 200A as an example below) by ac current source 1d
Primary current, start-phase are b ° (being 0 ° below with start-phase to be illustrated)；
Using acquisition terminal 3 by preset sample frequency (being illustrated by taking 10kHz as an example below) to the secondary returning of tested CT2
Road electric current is sampled, and every millisecond takes forward k (being illustrated for 200 below, including current point) a from current sampling point
Sampled point calculates secondary current virtual value, and is converted according to the no-load voltage ratio of tested CT2 to primary current, when primary current Sudden Changing Rate isWhen, it takes 200 sampled points backward from current sampling point, the phase of current sampling point primary current is calculated, if phase
Position then determines that the polarity in first and second circuit of tested CT2 is positive polarity, otherwise determines tested CT2 at (90 °, 270 °) section
First and second circuit polarity be negative polarity.
When judging polarity inaccuracy, additionally it is possible to rectification scheme is provided, such as: the polarity that actual requirement is tested CT2 is
Positive polarity, but the polarity detected is negative polarity, is only needed at this time by the binding post S1 and binding post S2 on tested CT2 secondary side
On electric wire exchange.Conversely, when the polarity that actual requirement is tested CT2 is negative polarity, but the polarity detected is positive
Polarity also only needs to exchange the electric wire on the binding post S1 and binding post S2 on tested CT2 secondary side once at this time.
In the present embodiment, further includes: the method for detecting tested CT2 no-load voltage ratio, specifically: it is acquired using acquisition terminal 3 tested
The secondary loop current of CT2；The ratio of the no-load voltage ratio output current value equal to ac current source 1d and secondary loop current of tested CT2
Value.If the output current value of ac current source 1d is 200A, if the secondary loop current that acquisition terminal 3 collects tested CT2 is
1A, the no-load voltage ratio that can detecte out the tested CT2 at this time is 200.In the present embodiment, internal CT1e can also be used to monitoring alternating current
The current value that stream source 1d is exported.
In the present embodiment, due to primary side verification host 1 and secondary side acquisition terminal 3 using wireless sensor network into
Row connection, and judgment method needs to compare the phase of primary side sinusoidal signal and secondary side sinusoidal signal, so two must be made
The data acquisition of side reaches time synchronization, can just make more significant.
Influencing WSN time irreversibility, mainly there are two reasons: (1) respectively there are frequency differences and shakiness for the crystal oscillator of timer
It is fixed；(2) delay in WSN message transmission procedure.Crystal oscillator is influenced caused by time synchronization: equipment different first
Crystal oscillator manufacture craft there are difference, although the frequency of crystal oscillator is identical, be different crystal oscillator work in different environment, it is practical
Situation is different, this will lead to the time and deviates, and eventually leads to the asynchronous of time.Secondly, the crystal oscillator price generally used
Cheaply, stability is not very high, and with the variation of time, environment, temperature etc. are all changing, and will lead to the clock frequency hair of crystal oscillator
Changing, and then lead to the asynchronous of time.
Delay in WSN message transmission procedure is mainly forward delay interval, reception delay, transmission delay, propagation delay, physics
Layer reception delay and upper layer reception delay.For different location WSN time synchronization, several algorithms are mainly used at present, mainly
(1) RBS algorithm, (2) TPSN algorithm, (3) DMTS algorithm etc., RBS algorithm synchronization accuracy is high, but calculates excessively complicated, energy consumption
Too high, TPSN algorithm is to be classified two-way simultaneous mode, synchronization accuracy ratio RBS high, but the algorithm is also excessively complicated, DMTS algorithm
Using the hierarchical broadcast formula method of synchronization, arithmetic accuracy ratio RBS is slightly lower, but calculates relatively easy while energy consumption also phase
To lower, the synchronized algorithm in the present embodiment mainly uses DMTS algorithm.
DMTS algorithm has referred to as delay measurements Time synchronization algorithm, and the algorithm is mainly by when transmitting terminal is embedded in local
Between and message send together, receiving end receives the propagation time delay between calculating after message, last receiving end sheet
The ground time is changed to the sum of propagation delay time and sending instant.The algorithm calculates simple, it is only necessary to broadcast a band sometimes
Between message WSN time synchronization can be completed, low energy consumption, has wide range of applications, and schematic diagram is shown in Fig. 4.
Claims (7)
1. a kind of transformer substation current transformer secondary side polarity intelligent detection device, it is characterised in that: including verification host (1) and
Multiple acquisition terminals (3)；
The verification host (1) include first human-computer interaction module (1a), supervisor module (1b), acquisition recording module (1c),
Ac current source (1d), inside CT(1e) and radio receiving transmitting module (1f)；The supervisor module (1b) is man-machine with first respectively
Interactive module (1a), ac current source (1d), radio receiving transmitting module (1f) and acquisition recording module (1c) connection；Ac current source
It is in parallel with tested CT(2) after internal CT(1e) primary side that (1d) exports electric current；Internal CT(1e) secondary side connection acquisition
Recording module (1c)；
Wherein, the first human-computer interaction module (1a) is for configuring testing scheme, input parameter, test process monitoring, checking
Waveform and check test report；
The ac current source (1d) is for exporting 0A~200A alternating current；
The radio receiving transmitting module (1f) is for realizing the communication between supervisor module (1b) and acquisition terminal (3)；
The acquisition terminal (3) be used for acquire tested CT(2) secondary loop current, generate the first recorded wave file simultaneously be transferred to pipe
Reason machine module (1b)；
It is described acquisition recording module (1c) be used for acquire tested CT(2) primary circuit electric current, generate the second recorded wave file simultaneously pass
It is defeated by supervisor module (1b)；
The supervisor module (1b) is used to analyze with the first recorded wave file and the second recorded wave file when primary test, and judges
The polar correctness of CT out.
2. transformer substation current transformer secondary side polarity intelligent detection device according to claim 1, it is characterised in that: institute
Stating acquisition terminal (3) includes forcipated mutual-inductor module (3a), processing module (3b), communication module (3c), the second human-computer interaction mould
Block (3d) and acquisition module (3e)；The forcipated mutual-inductor module (3a) is electrically connected with acquisition module (3e)；The acquisition module
(3e), communication module (3c) and the second human-computer interaction module (3d) are electrically connected with processing module (3b) respectively.
3. transformer substation current transformer secondary side polarity intelligent detection device according to claim 2, it is characterised in that: institute
Stating acquisition module (3e) includes aviation plug, 5 times of attenuator circuits, two-stage amplifying circuit and modulus conversion chip；
5 times of attenuator circuits include resistance R3, resistance R4, resistance R7, resistance R8 and analog switch U1, and resistance R8 and simulation are opened
It is in parallel with resistance R7 after the U1 series connection of pass, then connect with resistance R3, resistance R4；
Two-stage amplifying circuit includes first order amplifying circuit and second level amplifying circuit, in which:
First order amplifying circuit includes resistance R5, resistance R6, resistance R9, capacitor C1 and operational amplifier U2；One end of resistance R5
Ground connection, the other end of resistance R5 are connect through resistance R6 with the inverting input terminal of operational amplifier U2；One end of capacitor C1 and operation
The inverting input terminal of amplifier U2 connects, and the other end of capacitor C1 is connect with the output end of operational amplifier U2, resistance R9 and electricity
It is in parallel to hold C1；
Second level amplifying circuit includes resistance R10, resistance R11, resistance R12, capacitor C2 and operational amplifier U3；Resistance R10's
One end ground connection, the other end of resistance R10 are connect through resistance R11 with the inverting input terminal of operational amplifier U3；One end of capacitor C2
It is connect with the inverting input terminal of operational amplifier U3, the other end of capacitor C2 is connect with the output end of operational amplifier U3, resistance
R12 and capacitor C2 are in parallel.
4. a kind of transformer substation current transformer secondary side polarity intelligent detection method, it is characterised in that: using as claim 1 to
3 any transformer substation current transformer secondary side polarity intelligent detection devices, detection method includes the following steps:
Host (1) output primary current is verified by tested CT(2) primary circuit, using acquisition terminal (3) in tested CT(2)
Secondary side on acquire tested CT(2) secondary loop current, generate the first recorded wave file and be simultaneously transferred to supervisor module (1b)；
Tested CT(2) primary circuit electric current through verifying the inside CT(1e of host (1)) be sent into acquisition recording module (1c), generate
Second recorded wave file is simultaneously transferred to supervisor module (1b)；
Supervisor module (1b) analyzes the first recorded wave file and the second recorded wave file, and judges automatically out tested CT(2)
Polar correctness.
5. transformer substation current transformer secondary side polarity intelligent detection method according to claim 4, it is characterised in that: logical
Ac current source (1d) is crossed to tested CT(2) it is passed through the primary current of aA, start-phase is b °；
Using acquisition terminal (3) with preset sample frequency to tested CT(2) secondary loop current sample, every millisecond from working as
Preceding sampled point takes forward k sampled point to calculate secondary current virtual value, and according to tested CT(2) no-load voltage ratio convert to primary electricity
Stream takes k sampled point from current sampling point when primary current Sudden Changing Rate is preset threshold backward, calculates current sampling point one
The phase of primary current, if phase in pre-set interval, determines tested CT(2) the polarity in first and second circuit be positive polarity,
Otherwise determine tested CT(2) the polarity in first and second circuit be negative polarity.
6. transformer substation current transformer secondary side polarity intelligent detection method according to claim 5, it is characterised in that: logical
Ac current source (1d) is crossed to tested CT(2) it is passed through 200A primary current, start-phase is 0 °；
Using acquisition terminal (3) with 10kHz sample frequency to tested CT(2) secondary loop current sample, every millisecond from
Current sampling point takes forward 200 sampled points to calculate secondary current virtual values, and according to tested CT(2) no-load voltage ratio convert to primary
Electric current takes 200 sampled points from current sampling point when primary current Sudden Changing Rate is A backward, and it is once electric to calculate current sampling point
The phase of stream, if phase at (90 °, 270 °) section, then determines tested CT(2) the polarity in first and second circuit be anode
Property, otherwise determine tested CT(2) the polarity in first and second circuit be negative polarity.
7. according to any transformer substation current transformer secondary side polarity intelligent detection method of claim 4 to 6, feature
It is, further includes: judge tested CT(2) method of no-load voltage ratio, specifically:
Utilize acquisition terminal (3) to acquire tested CT(2) secondary loop current；
Tested CT(2) the no-load voltage ratio output current value equal to ac current source (1d) and secondary loop current ratio.
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