CN101644752A - Online accuracy detection method and system of current transformer - Google Patents
Online accuracy detection method and system of current transformer Download PDFInfo
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- CN101644752A CN101644752A CN200910065784A CN200910065784A CN101644752A CN 101644752 A CN101644752 A CN 101644752A CN 200910065784 A CN200910065784 A CN 200910065784A CN 200910065784 A CN200910065784 A CN 200910065784A CN 101644752 A CN101644752 A CN 101644752A
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Abstract
The invention discloses online accuracy detection method and system of a current transformer. A standard current sensor is connected with a transmission line and collects a current signal on the transmission line; a current signal output by the current transformer and the current signal on the transmission line are collected by respective signal collectors and sent to a signal processor in sharingtime; and the signal processor synchronously sends the signals to a central processing system (CPU) which compares and processes the two signals received in the same clock and calculates the error conditions of the measured current transformer. The online accuracy detection system of the current transformer can be electrically connected or disconnected with a circuit of a transformer to be measured and can uninterruptedly carry out accuracy comparison measurement with the transformer to be measured under an electric operation condition for dozens of hours so as to estimate the current transformer under different operational working conditions and environmental characteristics, achieve the online accuracy estimation of the current transformer and have favorable effect.
Description
Technical field
The present invention relates to high-voltage mutual inductor precision measure technical field, especially relate to a kind of online test method and system of high-tension current inductor.
Background technology
At present, carry out along with China's electrical network industrial expansion, particularly power industry system reform send out, the separation of transmission of electricity, electric energy metrical accurately, justice and fairness more cause the concern of each side.Current transformer accurately, reliably be the important assurance of electric system metering, protection, monitoring.For the justice that guarantees to guarantee electric energy metrical and just, effectively protect power department, generating department and user three parts's legitimate rights and interests, be very necessary to the calibrating of current transformer error.The estimated current mutual inductor field detecting mainly is under power-off condition, connect with tested current transformer by standard current transformer, adopt on-the-spot same current source, the output of the secondary of standard mutual inductor and tested mutual inductor is connected to comparator, obtain the ratio and the angular difference of tested mutual inductor.
According to rules JJG1021-20076.5 regulation, " calibration interval of electromagnetic current transducer must not above 10 years ".At present the current transformer of hanging net operation is generally in newly-built installation with examine and determine after date and have a power failure according to traditional calibration method and examine and determine.There are two problems in such calibrating mode: 1) even exist current transformer overproof, also must wait until after calibrating expires and can check out that its overproof influence that causes can't in time be learnt in the calibration interval; 2) traditional calibration method is to carry out under specific site environment, can't truly reflect the precision characteristic under the current transformer run duration varying environment condition.Along with the further in-depth with power market reform of further developing of power industry technologies, foundation can be guaranteed to send out, fails, joins, the measuring system of electricity consumption each side legitimate interests will ever more important.How effectively to solve the drawback that traditional mutual inductor exists, can not treat when being.By shortening the rationality that the calibration interval improve metrological supervision simply is worthless, because along with the development of various industrial technologies, the loss that is brought that has a power failure in short-term also is very huge.Therefore realize that the live line measurement of current transformer precision is only the optimum method of dealing with problems.
Summary of the invention
The purpose of this invention is to provide a kind of method and system that is applicable to the current mutual inductor on site live line measurement, realized the online comparison of current transformer precision.
The technical solution used in the present invention is: the online accuracy checking method of a kind of current transformer, it is characterized in that: the normalized current sensor is connected with transmission pressure, by the current signal on the normalized current sensor acquisition transmission pressure, the current signal of tested current transformer output and the current signal on the transmission pressure are by separately signal picker collection, and timesharing sends to signal processor, signal processor sends to central processing system with signal Synchronization, central processing system calculates the error condition of tested current transformer with the processing of comparing of two signals of the synchronization that receives.
The online accuracy detection of a kind of current transformer system, it is characterized in that: comprise normalized current sensor, signal picker, signal processor, central processing system and power supply module, the output terminal of normalized current sensor is connected with the input end of first signal picker, the output terminal of tested current transformer is connected with the input end of secondary signal collector, the output terminal of the output terminal of first signal picker and secondary signal collector all is connected with the input end of signal processor, and the output terminal of signal processor is connected with the input end of central processing system; Power supply module is used for providing power supply to first collector.
Described normalized current sensor is the Luo Shi hollow coil based on PCB with opening, this Luo Shi hollow coil is made of the double-deck pcb board of two semi-round ring shapes, every layer of pcb board is provided with coil, coil is made of the lead and the wire column that are engraved on the pcb board top and bottom, lead evenly is arranged on the pcb board by the wire guide that is provided with on the pcb board, the coil of two boards is connected by the line that is flexible coupling, has opening between two pcb boards, opening one end connects by bindiny mechanism, and the other end is drawn two signal output parts with the signal extension line.
Be provided with insulating blanket between every layer of pcb board plate, pcb board is arranged with mirror-image structure, described mirror-image structure is that the lower surface of pcb board of the upper surface of pcb board on upper strata and lower floor is in full accord, and the upper surface of the lower surface of the pcb board on upper strata and the pcb board of lower floor is in full accord; Epoxy layer in the middle of pcb board comprises respectively is provided with conductor layer and insulation enamelled coating in the symmetria bilateralis of middle epoxy layer.
Also be connected with integrating circuit between the input end of the output terminal of described normalized current sensor and first signal picker.
Described integrating circuit is made of operational amplifier, resistance and electric capacity; The inverting input of operational amplifier is connected with second output terminal with first output terminal of normalized current sensor with second resistance by first resistance respectively with the in-phase input end electricity, be connected between the inverting input and output terminal of operational amplifier after the 3rd resistance and the first electric capacity parallel connection, the 4th resistance and an end ground connection after second electric capacity is in parallel, the other end is connected with the in-phase input end of operational amplifier.
Described first signal picker comprises an A/D change-over circuit, first processor, the input end of the one A/D change-over circuit is connected with the output terminal of integrating circuit, the output terminal of the one A/D change-over circuit is connected with the input end of first processor, and the output terminal of first processor is connected with signal processor with optical fiber by first electrical to optical converter.
Described secondary signal collector comprises I/V change-over circuit, the 2nd A/D change-over circuit and second processor, the input end of I/V change-over circuit is connected with the output terminal of tested current transformer, the output terminal of I/V change-over circuit is connected with the input end of the 2nd A/D change-over circuit, the output terminal of the 2nd A/D change-over circuit is connected with the input end of second processor, and the output terminal of second processor is connected with signal processor with optical fiber by second electrical to optical converter.
The present invention adopts technique scheme will reach following technique effect: the online accuracy detection of current transformer of the present invention system can and withdraw from tested mutual inductor place circuit with the charged access of system, consecutive numbers carried out the precision matching measurement with tested mutual inductor in tens hours incessantly under the charging operation situation, thereby can realize the evaluation under different operating conditions of current transformer and the environmental characteristics, to mutual inductor tradition calibration method and the useful additional and improvement of rules, realize the online evaluation of current transformer precision, have good effect.
Adopt PCB Luo Shi hollow coil based on opening as the normalized current sensor in the native system, mix integrating circuit, can realize the installation and removal of current measuring device easily, make circuit by higher anti-external magnetic field interference capability, satisfy the demand of high precision, high vulnerability to jamming to a great extent, overall performance is good; Adopting computing machine is the unified hardware platform of instrument, utilizes primary mental ability functions such as computing machine is done computing, stores, called, demonstration, for the realization of native system provides convenient mode; Algorithm process based on Labview is to adopt the DFT algorithm of quadravalence rectangle convolution window, effectively reduces because of the non-integer-period sampled spectrum leakage error that causes, and higher accuracy is arranged, and has reduced cost of development and cycle to a greater extent.
Description of drawings
Fig. 1 is a system chart of the present invention;
Fig. 2 is a schematic block circuit diagram of the present invention;
Fig. 3 is for having the structural representation based on the Luo-coil of PCB of opening among the present invention;
Fig. 4 is for having the vertical view based on the single pcb board of the Luo-coil of PCB of opening among the present invention;
Fig. 5 is the A-A cut-open view of Fig. 4;
Fig. 6 is the B-B cut-open view of Fig. 4;
Fig. 7 is for having the expansion synoptic diagram based on two plates connections of the Luo-coil of PCB of opening among the present invention;
Fig. 8 among the present invention be have opening based on the another kind of embodiment of the Luo-coil of PCB structural representation;
Fig. 9 is the C-C cut-open view of Fig. 8;
Figure 10 is the integrating circuit schematic diagram among the present invention;
The process flow diagram that Figure 11 handles for comparison among the present invention.
Embodiment
Being example with the current transformer of 220KV is described in detail the method and system of the online accuracy detection of current transformer of the present invention.
As shown in Figure 1, the online accuracy detection of current transformer of the present invention system comprises normalized current sensor, signal picker, signal processor, central processing system and power supply module, the output terminal of normalized current sensor is connected with the input end of first signal picker, the output terminal of tested current transformer is connected with the input end of secondary signal collector, the output terminal of the output terminal of first signal picker and secondary signal collector all is connected with the input end of signal processor, and the output terminal of signal processor is connected with the input end of central processing system.Power supply module is used for providing power supply to first signal picker, and power supply module adopts accumulator.
As depicted in figs. 1 and 2, also be connected with integrating circuit between the output terminal of normalized current sensor (Luo Shi hollow coil) and the input end of first signal picker based on PCB with opening, first signal picker comprises an A/D change-over circuit, first single-chip microcomputer, the input end of the one A/D change-over circuit is connected with the output terminal of integrating circuit, the output terminal of the one A/D change-over circuit is connected with the input end of first single-chip microcomputer, and the output terminal of first single-chip microcomputer is connected with second photoelectric commutator with optical fiber by first electrical to optical converter.The secondary signal collector comprises I/V change-over circuit, the 2nd A/D change-over circuit and second singlechip, the input end of I/V change-over circuit is connected with the output terminal of tested current transformer, the output terminal of I/V change-over circuit is connected with the input end of the 2nd A/D change-over circuit, the output terminal of the 2nd A/D change-over circuit is connected with the input end of second singlechip, and the output terminal of second singlechip is connected with first photoelectric commutator with optical fiber by second electrical to optical converter.The output terminal of the output terminal of first photoelectric commutator and second photoelectric commutator is connected with the input end of the 3rd single-chip microcomputer, and the communication port of the 3rd single-chip microcomputer is connected with PC by RS232.In the present embodiment, first single-chip microcomputer, second singlechip and the 3rd single-chip microcomputer are MSP430F1611, the one A/D change-over circuit and the 2nd A/D change-over circuit are ADS8325, the I/V change-over circuit is XTR101AP, and first electrical to optical converter and second electrical to optical converter are that HFBR1414, first photoelectric commutator and second photoelectric commutator are HFBR2412.
Shown in Fig. 3,4, the normalized current sensor is the Luo Shi hollow coil based on PCB with opening, comprises open type aluminum shielding box 17 and two-layer up and down pcb board (printed circuit board (PCB)) 1,13, stacked placement.Every layer of pcb board comprises two semi-round ring shape plates 15,16, and semi-round ring shape plate 15,16 is oppositely arranged.Shielding box 17 is divided into two parts up and down, and semi-round ring shape plate 15,16 lays respectively in two parts up and down of shielding box 17, is provided with the hole of passing through for transmission pressure in the middle of the shielding box 17.Locate to be provided with bindiny mechanism 18 at the left side of shielding box 17 opening (very opening), with shielding box about in the of 17 two parts couple together, two parts can be around bindiny mechanism's 18 rotating opening about in the of 17 for shielding box.Shielding box 17 mainly is to be used for shielding external electromagnetic signal, prevents to disturb, and plays the inner semi-round ring shape plate 15,16 of protection simultaneously.Bindiny mechanism 18 is rotating shaft, perhaps other articulated mounting.Open the opening 6 of shielding box 17, make a current pass shielding box 17, bindiny mechanism 18 is open and close fast, and guarantees the accurately firm of installation.Simultaneously, in order to ensure the consistance of measuring accuracy of the present invention and installation, the internal diameter r of open type aluminium shielding box 17 size is identical with the external diameter of a current.
Shown in Fig. 5,6, be provided with insulating blanket 9 (as thin insulating paper or ambroin etc.) between the pcb board 1,13, this can guarantee that the conductor on the two plate surface of contact isolates mutually.Single pcb board is followed successively by insulation enamelled coating 10, conductor layer 11, middle epoxy layer 12, conductor layer 11, edge lacquer enamelled coating 10 from top to bottom.Pcb board all is carved with lead 2 on 1 top and bottom, and lead 2 is along the circumferential direction evenly distributed onboard, and each lead 2 two ends is equipped with lead via hole 3, lead via hole 3 passes pcb board 1, wire column 19 is located in the lead via hole 3, and the lead on the top and bottom 2 is coupled together, thereby constitutes coil.The pcb board 13 that is positioned at the below also has identical structure.
As shown in Figure 7, the coil of each semi-round ring shape plate all has pair of output U+ and U-, being positioned at the U-of semi-round ring shape plate 15 on upper strata and the U+ of semi-round ring shape plate 16 is connected by connecting line 4, being positioned at the U+ of semi-round ring shape plate 15 of lower floor and the U-of semi-round ring shape plate 16 is connected by connecting line 4, be positioned at the U-of semi-round ring shape plate 16 on upper strata and the U+ of the semi-round ring shape plate 16 that is positioned at lower floor at last and be connected, do not connected and remaining output terminal U+ is connected with output line 5 respectively with U-by lead by connecting line between plate 8.Being equivalent to the coil that connection lead 8 will lay respectively on the pcb board 1,13 between plate is flexible coupling.
What have opening follows the principle of design of air core coil in design based on the Luo Shi hollow coil of PCB, but because the substrate thickness limited (common sheet metal thickness is no more than 3mm) of printed circuit board (PCB), and increase along with thickness, the difficulty of processing that interlayer is electrically connected via hole 3 will increase and cause its reliability to reduce, so the PCB hollow coil generally is in series by the polylith pcb board.
The processing of printed circuit board (PCB) generally is to be controlled automatically by machine to carry out corrosion treatment, processing, and the control accuracy of printed-board technology is higher, can effectively guarantee the distribution symmetrically of multiturn coiling.Because the base material of printed circuit board (PCB) and copper-clad is combined closely and temperature stability is fabulous, even in violent temperature variation, the shape of coil and the distribution of multiturn coil remain unanimity.Therefore only need after finishing coil design, just can carry out the making of plate coil automatically after utilizing special software to draw out pcb board figure by the print circuit plates making system.
Paired pcb board is arranged with mirror-image structure, as shown in Figure 7, the lower surface of the upper surface of pcb board 1 and pcb board 13 is in full accord, and the upper surface of the lower surface of pcb board 1 and pcb board 13 is in full accord, every pair of outlet terminal that becomes the mirror image pcb board to draw a pair of connection output line.Unroll in the similar conventional coil of effect that the pcb board mirror image the is arranged function of line, the influence that can effectively resist the external interference electromagnetic field effectively improves the interference free performance of coil.
Correspondence is provided with several (shown in the figure being 12) connecting holes 14 on pcb board 1,13 circumference, penetrates connecting hole 14 with screw 7 and then two pcb boards 1,13 is connected combination.
Method for making is: as shown in Figure 4, selected suitable diagonal angle is two semi-circular plates 15,16 with its subdivision on toroid winding.Lead via hole 3 in the selected opening both sides of an opening part of semi-circular plate 15,16 utilizes connecting line 4 (soft fried twist lead) that its recovery is electrically connected, and connecting line 4 is the line that is flexible coupling; Opposite side opening 6 keeps so that be installed on current.According to the position of air core coil output terminal, draw output line 5.
The Luo Shi hollow coil based on PCB that the normalized current sensor has opening can also be embodied as described below: shown in Fig. 8,9, semi-round ring shape plate 15,16 only is one deck pcb board 1, be not further divided into two-layer, not needing to connect between plate lead 8 connects, pcb board 1 dimidiation is respectively semi-round ring shape plate 15,16, and the U+ of the U-of semi-round ring shape plate 15 and semi-round ring shape plate 16 is connected by connecting line 4, remaining U+ and U-are output terminal, are connected with output line 5 respectively.
As shown in figure 10, integrating circuit is made of operational amplifier A, resistance R 1, R2 and capacitor C 1, C2: the inverting input of operational amplifier A is connected with second output terminal with first output terminal of normalized current sensor with R2 by R1 respectively with in-phase input end, be connected between the inverting input and output terminal of operational amplifier A after resistance R 3 and capacitor C 1 parallel connection, resistance R 4 and capacitor C 2 backs in parallel one end ground connection, the other end is connected with the in-phase input end of operational amplifier A.Then after the current signal input integral processing of circuit of the output terminal of normalized current sensor output, the output V0 of integrating circuit is measurable voltage output signal, and this voltage output signal is used for being input in first signal picker to be handled.
The principle that adopts the online accuracy detection of this current transformer system to detect is as described below: as shown in Figure 2: under situation about not having a power failure, the Luo Shi hollow coil based on pcb board that will have opening is connected with transmission pressure, by the current signal on the Luo Shi hollow coil collection transmission pressure.Native system is connected when measuring, send measuring-signal by PC and give the 3rd single-chip microcomputer, the 3rd single-chip microcomputer sends measuring-signal for simultaneously first collector and second collector by optical fiber, and then first collector and second collector begin acquired signal simultaneously.The current signal of tested current transformer output is via the secondary signal collector for processing, carry out the I/V conversion earlier, make current signal become voltage signal, this voltage signal is again via the conversion of the 2nd A/D change-over circuit, be converted to digital signal and be transported to second singlechip, second singlechip through second electrical to optical converter and optical fiber, flows to the 3rd single-chip microcomputer through first photoelectric commutator with signal again; The Luo Shi hollow coil flows to the processing of first signal picker with the processing of the process of the current signal on the transmission pressure that collects integrating circuit, earlier through an A/D change-over circuit, be converted to digital signal and be transported to first single-chip microcomputer, first single-chip microcomputer through first electrical to optical converter and optical fiber, flows to the 3rd single-chip microcomputer through second photoelectric commutator with this signal again; The 3rd single-chip microcomputer timesharing receives the data of first single-chip microcomputer and second singlechip conveying, the 3rd single-chip microcomputer is finished PC serial communication based on Labview by serial ports, received signal Synchronization is sent to PC, PC is with the processing of comparing of the two paths of signals of synchronization, calculate the error condition of tested current transformer, show and the record measurement result.
The asynchronous serial communication mode is adopted in the serial communication of the 3rd single-chip microcomputer and PC, in PC, realize, baud rate (baud rate), data bits (data bits), parity (parity check bit), the stop bits (position of rest) etc. of serial ports are set under this module by the VISA communication module among the Labview.As shown in figure 11, PC may further comprise the steps the comparison processing that signal carries out:
(1), receive data: whether the counting of current signal of judging the sampling that receives reaches 1024;
(2), separation and extraction standard, tested two paths of signals data: the output current signal that will receive current signal on the transmission pressure and tested current transformer separates and extracts;
(3), data are carried out the discretize computing of quadravalence rectangle convolution window: utilize quadravalence convolution window algorithm to carry out Fourier transform to the data of separating and extract, from transformation results, extract the amplitude and the phase angle of power frequency component respectively; (tentative standard end amplitude phase angle is expressed as m respectively
1,
Tested end amplitude phase angle is expressed as m respectively
2,
Rectangular window function and Fourier transform thereof are as shown in the formula shown in (1) and (2).
Width is T
0Rectangular window function be defined as:
Its Fourier transform is:
(4) fundamental component is extracted in frequency-domain analysis: according to the amplitude and the phase angle of the above-mentioned power frequency component that obtains, reduce the electric current power frequency component amplitude and the phase angle of transmission pressure and tested current transformer respectively;
The transmission pressure end:
Power frequency component amplitude: U
M1=k
1* m
1(3)
The power frequency component phase angle:
Tested current transformer end:
Power frequency component amplitude: U
M2=k
2* m
2(5)
The power frequency component phase angle:
In formula (3)-(6),
k
1---the inverse of transmission pressure end data acquisition system signal gain;
k
2---the inverse of tested mutual inductor end data acquisition system signal gain;
Δ
1---the signal phase that transmission pressure end data acquisition system causes moves;
Δ
2---the signal phase that tested mutual inductor end data acquisition system causes moves;
U
M1---the electric current power frequency component amplitude of transmission pressure end;
U
M2---the electric current power frequency component amplitude of tested mutual inductor end;
(5), calculate the angular difference ratio: according to the power frequency component amplitude (U of electric current on the above-mentioned transmission pressure that obtains by the reduction of transmission pressure current signal acquisition circuit
M1) and phase angle
And the electric current power frequency component amplitude (U that obtains of tested current transformer output end signal reduction
M2) and phase angle
Carrying out ratio (δ) and angular difference (φ) calculates; Computing formula is shown as (7), (8) formula:
With above-mentioned ratio that obtains (δ) and the ratio threshold of setting, if ratio (δ) less than the ratio threshold value, thinks that the mutual inductor precision is not overproof in this time gatherer process; If ratio (δ) greater than the ratio threshold value, thinks that the mutual inductor precision is overproof in this time gatherer process; With above-mentioned angular difference that obtains (φ) and the angular difference threshold of setting, if angular difference (φ) less than the angular difference threshold value, thinks that the mutual inductor precision is not overproof in this time gatherer process; If angular difference (φ) greater than the angular difference threshold value, thinks that the mutual inductor precision is overproof in this time gatherer process;
(6), data presentation: repeat (1) repeatedly to (5) step, situation according to ratio in the system operation time (δ), angular difference (φ), precision to mutual inductor is assessed, if mutual inductor ratio (δ) has 20% overproofly in working time, thinks that then mutual inductor ratio (δ) is overproof; If mutual inductor angular difference (φ) has 20% overproofly in working time, think that then mutual inductor angular difference (φ) is overproof; And data presentation come out;
The algorithm of this data processing effectively reduces because of the non-integer-period sampled spectrum leakage error that causes, can reach the technical requirement of on-line testing system, and under the Labview platform, carry out signal Processing, realize the demonstration and the output of data result and waveform, for the realization of native system provides convenient mode.
Shown in the access of the on-the-spot hot line job of the online accuracy detection of this invention current transformer system and the following operation steps of method that withdraws from:
1, understands transformer station's outlet situation (height, model and the arranging situation that comprise wire erection), model, parameter and the operation conditions of collecting tested current transformer.Select suitable operation place, check the situation of intending inserting the section circuit, guarantee that circuit satisfies the condition of work of hot line job;
2, behind the scene, respectively each equipment of check system is checked, guaranteed that equipment does not cause the reduction of functional damage and precision after long-distance transport; Check that simultaneously required hot line job Work tool guarantees that its insulating property are good, in order to avoid cause unnecessary harm;
3, the work on the spot responsible official carries out safety to all testing crews (comprising that the consigner cooperates personnel) and confides a technological secret, and sets up the security warning band at pilot region;
4, the hot line job personnel hang over insulated flexible ladder on the lead, and concrete operations can be with reference to following steps:
A) φ 4mm insulation rope was thrown lead;
B) two fall coasters that have φ 10mm endless rope are hung on the lead;
C) the fall coaster that will have φ 10mm endless rope again hangs on the lead; The rope ladder head that will have rope ladder with the endless rope of φ 10mm hangs on the lead.
5, treat insulated flexible ladder after reliable connection the on the tested phase conductor, the equipotential live line work staff can implement ascending stair work.Concrete operations can be with reference to following steps:
A) the equipotential staff puts on qualified snare screening clothing and connects reliably, fastens seat belts and other protective devices;
B) through the site safety guardian equipotential staff's equipment inspection is guaranteed safe and punctual after, treat work responsible official permission after, can ascending stair;
C) the ground electrician presses down rope ladder and tightens up, and equipotential electrician steps on rope ladder and enters highfield;
D) climb to insulated flexible ladder upper end near the lead place the equipotential electrician, other positions of hand or health will enter highfield rapidly;
E) after entering electric field, equipotential staff at first will be affiliated to securing band or self-latch-up protection device, with autoprotection.
6, optical fiber insulator is fixed on the lead by the ascending stair personnel, concrete steps are as follows:
A) finish the pre-connection of optical fiber insulator, comprising: 3 optical fiber of 1 meter are connected on the insulator top flange (RX-RX), and simple fixation; 3 optical fiber of 20 meters are connected to insulator flange in the bottom (RX-RX) and fixing, make that optical fiber is sagging naturally not to have a tiny bending.
B) adopting the insulation rope to transmit is delivered to insulator near the equipotential staff;
C) the hot line job personnel are fixing on the line with insulator by insulator top suspension ring.
7, adopt the insulation rope that opening Luo-coil and aluminium band are passed to charged staff, transmission location is between insulator and charged staff, charged staff opens the coil spinner with coil clamp on the line, and use the aluminium band that lead is twined overstriking according to actual conditions, coil can closely be fixed on the lead; (remarks:, the auxiliary winding Signal plug need be connected the main coil correspondence position if double bundle conductor adopts major-minor coil modes; )
8, the charging test personnel are connected the coil corresponding interface with 3 optical fiber at insulator top;
9, the ground experiment personnel are connected (RX-TX) on the earth potential cabinet with the other end of 3 sagging optical fiber.After attended operation is finished, open earth potential cabinet AC220 power supply, open tested loop single-chip microcomputer battery supply, ground system begins sampling and record data.After pending data was normal, the hot line job personnel can return ground.
10, the equipotential staff withdraws from electric field according to the program opposite with entering electric field.
11, after ground system is started working, should use weight or earth anchor etc. to make it be difficult for swinging by the insulation rope is fixed optical fiber insulator lower end gold utensil.
12, after the off-test, at first cut off and close ground data acquisition system, the working method when inserting electrical network by equipotential staff and acquisition system enters electric field and removes equipment, by the insulation rope equipment is passed to ground after, withdrawing from electric field.
13, remove relevant Work tool and device on the lead.
Claims (10)
1. online accuracy checking method of current transformer, it is characterized in that: the normalized current sensor is connected with transmission pressure, by the current signal on the normalized current sensor acquisition transmission pressure, the current signal of tested current transformer output and the current signal on the transmission pressure are by separately signal picker collection, and timesharing sends to signal processor, signal processor sends to central processing system with signal Synchronization, central processing system calculates the error condition of tested current transformer with the processing of comparing of two signals of the synchronization that receives.
2. the online accuracy checking method of current transformer according to claim 1 is characterized in that: described comparison is handled and be may further comprise the steps:
(1), whether the sampling number of judging the current signal receive reaches standard sample and counts;
(2), the output current signal that will receive current signal on the transmission pressure and tested current transformer separates and extracts;
(3), utilize quadravalence convolution window algorithm to carry out Fourier transform, from transformation results, extract the amplitude and the phase angle of power frequency component respectively to the data of separating and extract;
(4), according to the amplitude and the phase angle of the above-mentioned power frequency component that obtains, reduce the electric current power frequency component amplitude and the phase angle of transmission pressure and tested current transformer respectively;
(5), the electric current power frequency component amplitude (U of the transmission pressure that obtains according to above-mentioned reduction
M1) and phase angle (
) and the electric current power frequency component amplitude (U of tested current transformer
M2) and phase angle (
), carry out ratio (δ) and angular difference (φ) and calculate; With above-mentioned ratio that obtains (δ) and the ratio threshold of setting, if ratio (δ) less than the ratio threshold value, thinks that the mutual inductor precision is not overproof in this time gatherer process; If ratio (δ) greater than the ratio threshold value, thinks that the mutual inductor precision is overproof in this time gatherer process; With above-mentioned angular difference that obtains (φ) and the angular difference threshold of setting, if angular difference (φ) less than the angular difference threshold value, thinks that the mutual inductor precision is not overproof in this time gatherer process; If angular difference (φ) greater than the angular difference threshold value, thinks that the mutual inductor precision is overproof in this time gatherer process;
(6), repeat (1) repeatedly to (5) step, situation according to ratio in the system operation time (δ), angular difference (φ), precision to mutual inductor is assessed, if the overproof amount of mutual inductor ratio (δ) surpasses the overproof standard of stipulating in working time, thinks that then mutual inductor ratio (δ) is overproof; If the overproof amount of mutual inductor angular difference (φ) surpasses the overproof standard of regulation in working time, think that then mutual inductor angular difference (φ) is overproof.
3. the online accuracy checking method of current transformer according to claim 2, it is characterized in that: described normalized current sensor is the Luo Shi hollow coil based on PCB with opening, it comprises one deck pcb board at least, every layer of pcb board is made up of two semi-round ring shape plates that are oppositely arranged, be provided with spacing between two semi-round ring shape plates, an end opening of two semi-round ring shape plates is normal opening; Along the circumferential direction be provided with coil on every layer of pcb board; Coil is made of the wire column that is engraved in the lead on the pcb board top and bottom and connects the top and bottom lead, often opens opening part and draws signal output part with the signal extension line; The coil of two semi-round ring shape plates is connected in series by connecting line.
4. the online accuracy checking method of current transformer according to claim 3, it is characterized in that: it comprises the pcb board that a pair of stacked on top of one another is placed, a pair of pcb board comprises two-layer pcb board, be provided with insulating blanket between the pcb board, two-layer pcb board is arranged with mirror-image structure, connects by connecting lead between plate between the coil on the pcb board; Described mirror-image structure is that the lower surface of the upper surface of upper strata pcb board and lower floor's pcb board is in full accord, and the upper surface of the lower surface of upper strata pcb board and lower floor's pcb board is in full accord; The coil of adjacent two pairs of pcb boards is connected in series by lead; Epoxy layer in the middle of described pcb board comprises respectively is provided with conductor layer and insulation enamelled coating in the symmetria bilateralis of middle epoxy layer; Described pcb board is located in the shielding box, and shielding box and plate shape are suitable, and shielding box one side is connected by bindiny mechanism; Connect by screw between the adjacent two-layer pcb board.
5. the online accuracy detection of current transformer system, it is characterized in that: comprise normalized current sensor, signal picker, signal processor, central processing system and power supply module, the output terminal of normalized current sensor is connected with the input end of first signal picker, the output terminal of tested current transformer is connected with the input end of secondary signal collector, the output terminal of the output terminal of first signal picker and secondary signal collector all is connected with the input end of signal processor, and the output terminal of signal processor is connected with the input end of central processing system; Power supply module is used for providing power supply to first collector.
6. the online accuracy detection of current transformer according to claim 5 system, it is characterized in that: described normalized current sensor is the Luo Shi hollow coil based on PCB with opening, it comprises one deck pcb board at least, every layer of pcb board is made up of two semi-round ring shape plates that are oppositely arranged, be provided with spacing between two semi-round ring shape plates, an end opening of two semi-round ring shape plates is normal opening; Along the circumferential direction be provided with coil on every layer of pcb board; Coil is made of the wire column that is engraved in the lead on the pcb board top and bottom and connects the top and bottom lead, often opens opening part and draws signal output part with the signal extension line; The coil of two semi-round ring shape plates is connected in series by connecting line.
7. the online accuracy detection of current transformer according to claim 6 system, it is characterized in that: it comprises the pcb board that a pair of stacked on top of one another is placed, a pair of pcb board comprises two-layer pcb board, be provided with insulating blanket between the pcb board, two-layer pcb board is arranged with mirror-image structure, connects by connecting lead between plate between the coil on the pcb board; Described mirror-image structure is that the lower surface of the upper surface of upper strata pcb board and lower floor's pcb board is in full accord, and the upper surface of the lower surface of upper strata pcb board and lower floor's pcb board is in full accord; The coil of adjacent two pairs of pcb boards is connected in series by lead; Epoxy layer in the middle of described pcb board comprises respectively is provided with conductor layer and insulation enamelled coating in the symmetria bilateralis of middle epoxy layer; Described pcb board is located in the shielding box, and shielding box and plate shape are suitable, and shielding box one side is connected by bindiny mechanism; Connect by screw between the adjacent two-layer pcb board.
8. according to claim 5 or the online accuracy detection of 7 described current transformers system, it is characterized in that: also be connected with integrating circuit between the input end of the output terminal of described normalized current sensor and first signal picker.
9. the online accuracy detection of current transformer according to claim 8 system, it is characterized in that: described first signal picker comprises an A/D change-over circuit, first processor, the input end of the one A/D change-over circuit is connected with the output terminal of integrating circuit, the output terminal of the one A/D change-over circuit is connected with the input end of first processor, and the output terminal of first processor is connected with signal processor with second photoelectric commutator by first electrical to optical converter, optical fiber.
10. the online accuracy detection of current transformer according to claim 9 system, it is characterized in that: described secondary signal collector comprises the I/V change-over circuit, the 2nd A/D change-over circuit and second processor, the input end of I/V change-over circuit is connected with the output terminal of tested current transformer, the output terminal of I/V change-over circuit is connected with the input end of the 2nd A/D change-over circuit, the output terminal of the 2nd A/D change-over circuit is connected with the input end of second processor, and the output terminal of second processor is by second electrical to optical converter, optical fiber is connected with signal processor with first photoelectric commutator.
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