CN102654571A - Comprehensive tester of current transformer - Google Patents

Comprehensive tester of current transformer Download PDF

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Publication number
CN102654571A
CN102654571A CN2011100498704A CN201110049870A CN102654571A CN 102654571 A CN102654571 A CN 102654571A CN 2011100498704 A CN2011100498704 A CN 2011100498704A CN 201110049870 A CN201110049870 A CN 201110049870A CN 102654571 A CN102654571 A CN 102654571A
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current transformer
module
comprehensive tester
test
data
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CN102654571B (en
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王庆东
胡祖祥
赖道松
王雄斌
韩冰
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SHENZHEN KINGSINE ELECTRIC AUTOMATION CO Ltd
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SHENZHEN KINGSINE ELECTRIC AUTOMATION CO Ltd
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Abstract

The invention relates to a comprehensive tester of a current transformer, comprising a DSP (Digital Signal Processor) control calculation module, a power amplification output module, an AD (Analog-Digital) sampling module and a data processing module, wherein the DSP control calculation module is used for sending a control signal according to testing parameters set by the data processing module to control the power amplification output module to generate a required voltage source for the current transformer, and is used for controlling the AD sampling module to collect required current transformer data; and the data processing module is used for setting the testing parameters according to a DSP, reading a testing result which is calculated by the DSP control calculation module according to the collected current transformer data, and storing testing data. The comprehensive tester disclosed by the invention adopts a frequency conversion technology to generate required needed voltage source for the current transformer to be detected; the parameters needing to be measured are calculated by sampling module data of the current transformer; and a booster and a current raising device are not required, so that the volume of tester is greatly reduced, the test parameters are complete, the accuracy is high and beneficial guarantees are provided for safe operation of a power grid.

Description

The current transformer comprehensive tester
Technical field
The present invention relates to the testing tool technical field, more particularly, relate to a kind of on-the-spot digital current transformer comprehensive tester that can be used for.
Background technology
Current transformer be a kind of under regular service condition its secondary current be directly proportional in fact with primary current, and its phase differential approaches zero mutual inductor when connecting method is correct.Current transformer is widely used in the electric system, and a windings in series of current transformer is in power circuit, and the Secondary Winding external circuit connects surveying instrument, instrument or relay protection, automaton.Therefore the accuracy of current transformer be related to secondary device can operate as normal, be related to the safe and stable operation of whole electrical network.
The method that traditional current transformer testing apparatus adopts the up-flow that boosts to test needs built-in stepup transformer and current lifting device equipment to realize required voltage usually, can only be applied to the test of saturation voltage less than 2000V.On the one hand, when excitation property is tested, adopt the method for stepup transformer and current lifting device to have significant limitation, cause test parameter not entirely, accuracy is not high; On the other hand, built-in stepup transformer and current lifting device equipment often make testing apparatus become heavy, are not easy to transportation and use.And along with the rising of system voltage grade, the saturation voltage of mutual inductor is increasingly high, also needs external step-up transformer during test, and required testing apparatus is just heavy more.And for transient current transformer, the saturation voltage of a lot of transient state mutual inductors is up to 15KV, and this method of testing can't be exported so high voltage at all.
Summary of the invention
The technical matters that the present invention will solve is; Big to the testing apparatus volume that has current transformer now and can not test high saturation voltage current transformer defective provides a kind of current transformer comprehensive tester that test signal is tested current transformer automatically that under low, produces.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of current transformer comprehensive tester; Adopt converter technique; Give current transformer to be measured through DSP control power amplifier output module according to the corresponding voltage source of the parameter generating of required measurement; And the module data of current transformer sampled, calculate the parameter of required measurement.
The invention provides a kind of current transformer comprehensive tester, it is characterized in that, comprising: DSP control computing module, power amplifier output module, AD sampling module and data processing module; Said DSP control computing module links to each other with said power amplifier output module, is used for test parameter according to the said data processing module setting control power amplifier output module that transmits control signal and produces required voltage source to current transformer; Said DSP control computing module also links to each other with said AD sampling module, is used to control the AD sampling module and gathers required current transformer data; Said data processing module links to each other with said DSP control computing module, is used to that test parameter is set, reads test result and preservation test data that said DSP control computing module according to the current transformer data computation of gathering.
In current transformer comprehensive tester of the present invention, said DSP control computing module adopts the said control power amplifier of converter technique output module, the low pressure of the high pressure equivalence under output and the power frequency situation.
In current transformer comprehensive tester of the present invention, said DSP control computing module carries out loss balancing to the data of gathering when calculating magnetic hysteresis loss or eddy current loss.
In current transformer comprehensive tester of the present invention, said loss balancing compensates for the difference of the loss that produces under magnetic hysteresis loss or eddy current loss and the power frequency situation under the frequency of calculating said voltage source.
In current transformer comprehensive tester of the present invention, said data processing module and DSP control computing module can be analyzed for the parameter of the current transformer of unknown parameters automatically.
In current transformer comprehensive tester of the present invention, whether said data processing module and DSP control computing module can detect test wiring error automatically, detect institute's device of surveying automatically is current transformer, removes according to test environment and test interference automatically.
In current transformer comprehensive tester of the present invention; Said power amplifier output module links to each other with the secondary circuit of said current transformer; Required control signal is sent to the secondary circuit of said current transformer, and said power amplifier output module is made up of output control module and amplifier, output control module is controlled by FPGA; Adopt high-resolution D/A converter, amplifier adopts metering level high precision switching amplifier.
In current transformer comprehensive tester of the present invention, said AD sampling module links to each other with secondary circuit with the primary circuit of said current transformer simultaneously, gathers the primary circuit of current transformer and the data of secondary circuit simultaneously.
In current transformer comprehensive tester of the present invention, said current transformer comprehensive tester also comprises human-computer interaction module, links to each other with said data processing module, is used for acceptance test instruction and shows test results.
In current transformer comprehensive tester of the present invention, said current transformer comprehensive tester also comprises and is used for the network interface module that links to each other with PC, receives PC control of software test signal, and test data is uploaded PC go up and generate report.
The current transformer comprehensive tester of embodiment of the present invention; Have following beneficial effect: the present invention is through adopting converter technique; Give current transformer to be measured through the DSP control computing module control power amplifier output module that transmits control signal according to the corresponding voltage source of the parameter generating of required measurement; And the module data of current transformer sampled, calculate the parameter of required measurement; Owing to need not to adopt stepup transformer and current lifting device, reduced the volume of equipment greatly, can be applicable to the automatic test that the low magnetism leakage current transformer at various scenes advances easily; Comprehensive tester of the present invention also can be measured the transient current transformer in the network system simultaneously, and knee voltage can be up to 30KV, and its test parameter is complete, and accuracy is high, for electric power netting safe running provides favourable guarantee.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the module diagram according to the current transformer comprehensive tester of first embodiment of the invention;
Fig. 2 is the module diagram according to the current transformer comprehensive tester of second embodiment of the invention;
Fig. 3 is the circuit theory diagrams of power supply generation module;
Fig. 4 is the circuit theory diagrams of serial communication module;
Fig. 5 is the main circuit schematic diagram of DSP control computing module;
Fig. 6 is the current transformer simple equivalent circuit.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.
The present invention adopts the voltage converter technique; Produce different frequency, the sine of different voltages or the direct current signal of square-wave signal and different amplitudes through DSP control power amplifier output module and give current transformer to be measured; And magnitude of voltage, current value, resistance value, frequency values and the phase value etc. of current transformer different circuit are sampled, analyze and calculate; Directly show with figure and data mode, produce test report simultaneously at the man-machine interface interface.
See also Fig. 1, be module diagram according to the current transformer comprehensive tester of first embodiment of the invention.As shown in Figure 1, the current transformer comprehensive tester 100 that first embodiment of the invention provides comprises: DSP control computing module 108, power amplifier output module 106, AD sampling module 104 and data processing module 110.
Wherein, power amplifier output module 106 and AD sampling module 104 are connected to current transformer 102 to be measured, are respectively applied for to current transformer 102 to be measured voltage source is provided, and the circuit data that adopts current transformer 102.
DSP control computing module 108 links to each other with power amplifier output module 106; Be used for transmitting control signal to power amplifier output module 106, give current transformer 102 thereby make power amplifier output module 106 produce required voltage source according to the test parameter that data processing module 110 is provided with.DSP control computing module 108 can adopt the said control power amplifier of converter technique output module, the low pressure of the high pressure equivalence under output and the power frequency situation.That is to say; DSP control computing module 108 can be according to the difference of the parameter of required measurement; Send the pwm signal of different frequency and different duty, give current transformer 102 to be measured thereby control power amplifier 106 produces different frequency, the sine of different voltages or the direct current signal of square-wave signal and different amplitudes.
Said DSP control computing module 108 also links to each other with said AD sampling module 104, is used to control AD sampling module 104 and gathers required current transformer data, calculates the parameter of required test.The circuit data of the required collections such as magnitude of voltage, current value, resistance value, frequency values and phase value of 104 pairs of current transformers 102 of AD sampling module is sampled, and after the AD conversion, flows to DSP control computing module 108.DSP control computing module 108 can be analyzed and handle these data, and when calculating magnetic hysteresis loss or eddy current loss, the data of gathering is carried out loss balancing.This loss balancing compensates for the difference of the loss that produces under magnetic hysteresis loss or eddy current loss and the power frequency situation under the frequency of calculating said voltage source.
Data processing module 110 links to each other with said DSP control computing module 108, is used to control button input, LCD demonstration.Data processing module 110 is carried out by industrial computer, and test parameter can be set, and reads the test result that said DSP control computing module according to the current transformer data computation of gathering, and realizes operation of data, preserves test data and produces test report.In addition; Current transformer comprehensive tester provided by the invention has the nameplate of guessing function; Be that said data processing module and DSP control computing module can be analyzed for the parameter of the current transformer of unknown parameters automatically; Even in any parameter of survey current transformer, also can not test, and the parameter of institute's current transformer is guessed out to current transformer knowing.This current transformer comprehensive tester also has the intelligence test function, and whether data processing module and DSP control computing module can detect test wiring error automatically, detect institute's device of surveying automatically is current transformer, removes according to test environment and test interference automatically.
See also Fig. 2, be module diagram according to the current transformer comprehensive tester of second embodiment of the invention.As shown in Figure 2; The current transformer comprehensive tester 200 that second embodiment of the invention provides also comprises human-computer interaction module 212 except comprising DSP control computing module 208, power amplifier output module 206, AD sampling module 204 and the data processing module 210 identical with 100 26S Proteasome Structure and Functions of first embodiment.Human-computer interaction module 212 and data processing module 210 communications are used for acceptance test and instruct to the test result of data processing module 210 with 210 acquisitions of video data processing module.The test result that data processing module 210 of the present invention is handled directly shows with figure and data mode at the man-machine interface interface.The current transformer comprehensive tester that present embodiment provides can adopt Chinese and English to switch with the human-computer interaction module 212 of LCD demonstration, and its friendly interface is attractive in appearance.Present embodiment can be through showing that for industrial computer configuration liquid crystal display interfaces such as SD storage card, network interface, USB, button, mouse-keyboard are realized human-computer interaction function.This current transformer comprehensive tester can link to each other with PC through the network interface module, utilizes PC software directly to control test, and test data is uploaded on the PC, generates the report of Word or Html form.
In addition, shown in second embodiment, power amplifier output module 206 links to each other with the secondary circuit 202-2 of said current transformer, required control signal is sent to the secondary circuit 202-2 of said current transformer.Said power amplifier output module can be made up of output control module and amplifier, and output control module is controlled by FPGA, adopts high-resolution D/A converter, and amplifier adopts metering level high precision switching amplifier.AD sampling module 204 links to each other with secondary circuit 202-2 with the primary circuit 202-1 of said current transformer simultaneously, gathers the data of the primary circuit 202-1 and the secondary circuit 202-2 of current transformer simultaneously.This AD sampling module 204 can adopt 16 A/D conversion chips of high precision, and electronic switch is set, and improves the measuring accuracy under the different ranges.Concrete signal transmission and sampling for different test parameters will be described follow-up.
Current transformer comprehensive tester of the present invention also comprises the power supply generation module.See also Fig. 3, be the circuit theory diagrams of power supply generation module.This power supply generation module is used to DSP control computing module, power amplifier output module and AD sampling module power supply is provided.Employing power supply chip U11 produces 3.3V among Fig. 3,1.9V voltage is controlled computing module, power amplifier output module and AD sampling module to DSP provides stable WV.
Carry out communication through serial ports between the DSP control computing module of current transformer comprehensive tester of the present invention and the industrial computer, as shown in Figure 4.Chip U62 realizes the serial communication function, thereby the data that DSP controls the computing module collection are sent to industrial computer, and the instruction of industrial computer is sent to DSP control computing module.Interface TX is connected with industrial computer with interface RX among Fig. 4, and interface SCITXDC_A and interface SCIRXDC_A are connected to DSP control computing module, thereby realize communication of data.
Please combine to consult Fig. 5, be the main circuit schematic diagram of DSP control computing module.Adopted dsp chip U58B to realize logic control and calculating among Fig. 5, realized on the one hand the control of power amplifier output module is produced required stable voltage source, realized on the other hand the collection and the preliminary data of various desired datas are handled and analyzed.Interface SCIRXDC_A is connected with the serial communication module with SCITXDC_A among Fig. 5, promptly is connected to interface SCIRXDC_A and SCITXDC_A among Fig. 4, handles thereby the data of gathering are sent to industrial computer.Interface xZCS0nA and xZCS0nA are used to be connected to the power amplifier output module among Fig. 5, and control power amplifier output module produces required voltage source to transmit control signal.Interface AD1_Start, AD2_Start and AD3_Start are connected to the AD sample circuit among Fig. 5, thereby obtain the circuit data of the current transformer of AD sample circuit collection.Only show the partial circuit of DSP control computing module among Fig. 5, those skilled in the art can also increase the FPGA control chip as required, realize Digital Control better.
In conjunction with prior art, understand the power generation circuit of Fig. 3, the serial communication circuit of Fig. 4, the DSP control circuit of Fig. 5 easily, therefore above-mentionedly only its formation and annexation are made brief account.Those skilled in the art can also design foregoing circuit according to functional requirement, and the circuit of power amplifier output module, AD sampling module, repeat no more at this.
Describe in the face of the test and the calculating of current transformer comprehensive tester of the present invention down various parameters.According to GB 1208-2006 current transformer (eqv IEC 60044-1:2003) and GB 16847-1997 protective current transformer, transient characterisitics technical requirement (idt IEC 60044-6:1992), the test of current transformer comprises following content: the confirming of the mensuration of turn ratio error, stable state ratio difference and phase differential, Secondary Winding resistance, the mensuration of secondary excitation characteristic, remanent magnetism coefficient, the calculating of secondary circuit time constant, the checking of the sum of errors low magnetism leakage structure under the limit value condition.Facing the wherein detection of several kinds of parameters down describes.
Seeing also Fig. 6 is the current transformer simple equivalent circuit.Interface P1 and P2 are the primary circuit side, and interface S1 and S2 are the secondary circuit side.
Measuring current mutual inductor Secondary Winding resistance: the power amplifier output module produces interface S1, the S2 that direct current signal is sent into transformer secondary circuit, and the electric current of AD sample circuit sample rate current transformer secondary circuit calculates through following formula (1):
R ct=U dc/I dc (1)
Wherein, Rct is a Secondary Winding resistance, and Udc is a current transformer voltage, and Idc is the current transformer electric current.Though resistance has difference under DC test and the actual power frequency operation situation, difference very I to ignore.
The core loss of measuring current mutual inductor: core loss is divided into magnetic hysteresis loss and eddy current loss; DSP control computing module control power amplifier output module produces different frequency but the interchange or the square-wave signal of identical magnetic flux are sent into secondary loop of mutual inductor, calculates the magnetic hysteresis loss and the eddy current loss of current transformer thus:
P h = σ h f B m n V - - - ( 2 )
P e = σ e f 2 B m 2 V - - - ( 3 )
In the formula (2), P hThe magnetic hysteresis loss [W] of current transformer core when being sinusoidal wave for input voltage; σ hBe the coefficient relevant (by the test decision) with ferromagnetic material; F is frequency [Hz], the i.e. coefficient of per second remagnetization; B mMaximal value [Wb/m for magnetic induction density on the magnetic hysteresis loop 2]; V is current transformer volume [m unshakable in one's determination 3]; N is by B mThe index of scope decision, as 0<B m<1.0 [Wb/m 2] time, n ≈ 1.6; As 0<B m<0.1 [Wb/m 2] or 1<B m<1.6 [Wb/m 2] time, n ≈ 2.
In the formula (3), P eThe magnetic hysteresis loss [W] of current transformer core when being sinusoidal wave for input voltage; σ eBe the coefficient relevant (by the test decision) with ferromagnetic material resistivity, sectional area, volume, shape; F is frequency [Hz]; B mMaximal value [Wb/m for magnetic induction density on the magnetic hysteresis loop 2]; V is current transformer volume [m unshakable in one's determination 3].
The aforementioned calculation formula only is theoretic formula; If tester only uses this formula; The data of test gained have either large or small measuring error; Reason is that what to adopt is the method for testing of frequency conversion, can be known that by the formula of magnetic hysteresis loss and eddy current loss loss is different under different frequency.Therefore the above-mentioned magnetic hysteresis loss and the formula of eddy current loss only belong to experimental formula commonly used on the engineering, therefore need revise magnetic hysteresis loss and eddy current loss, and then also try to achieve the eddy current impedance.
Therefore, data processing module of the present invention carries out loss balancing to the data of gathering when calculating magnetic hysteresis loss or eddy current loss.Said loss balancing is added the loss that power frequency produces, thereby is obtained measurement result comparatively accurately for the loss that the frequency that earlier magnetic hysteresis loss that calculates or eddy current loss is deducted said voltage source produces, and has improved the accuracy of comprehensive tester.
The excitation of current transformer is calculated:
ψ ( t ) = ∫ 0 t [ U ct ( t ) - R ct × I ct ( t ) ] dt + ψ 0 - - - ( 4 )
In order to try to achieve B-H loop, must try to achieve exciting current:
U L=U ct-R ct×I ct (5)
I L = I ct - U L R eddy - - - ( 6 )
Current transformer magnetic hysteresis loop: difference is constantly tried to achieve magnetic flux, then I according to formula (4) L(t) and the relation between the ψ (t) be exactly magnetic hysteresis loop.
U ct = π 2 2 T ∫ 0 t | U ct ( t ) | dt - - - ( 7 )
I ct = 1 T ∫ 0 t I ct 2 ( t ) dt - - - ( 8 )
I ct=max|I ct(t)| (9)
Wherein, formula (8) establishing criteria IEC 60044-1, formula (9) establishing criteria IEC 60044-6.
Current transformer excitation curve: when winding of current transformer is opened a way with other windings, put on the U on the secondary loop of mutual inductor CtWith I CtBetween relation, represent that with curve map or form the scope that these numerical value are contained should be enough to confirm from the excitation property of low excitation value up to specified flex point potential value.
Mutual inductor ratio thermometrically CT current error: feed sine voltage at transformer secondary circuit, record data such as required voltage, electric current, phase place respectively, calculate current ratio error, phase differential, combination misalignment etc. in primary circuit and secondary circuit.
In sum, the present invention adopts digital control technology, and control chip can adopt DSP and FPGA to realize on the one hand the control of power amplifier is produced required stable voltage source, realizes collection, calculating and analysis to various desired datas on the one hand.In addition, industrial computer is realized operation of data, and liquid crystal display shows, interfaces such as SD storage card, network interface, USB, button, mouse-keyboard, and carry out exchanges data and communication etc. through serial ports and DSP.
The present invention has realized testing at the scene various low magnetism leakage current transformers; Can measure various current transformers in electric system scene, current transformer and switch manufacturing plant; Also can measure for the transient current transformer in the network system; Knee voltage can be up to 15KV, and test parameter is complete, precision is high, quick, safety, convenience, for electric power netting safe running provides favourable guarantee.This current transformer comprehensive tester can be measured secondary winding in current transformer resistance, and accuracy reaches 0.1%+1m Ω.This current transformer comprehensive tester can also be measured the current transformer excitation curve, and the test flex point can reach 30KV.This current transformer comprehensive tester can be measured current transformer ratio, and the test no-load voltage ratio can reach 10000: 1, and precision can reach ± and 0.1%.This current transformer comprehensive tester can be measured the phase differential of current transformer primary current and secondary current, and resolution reaches 0.01min, and accuracy reaches ± 3min.This current transformer comprehensive tester can also be to the load measure of current transformer, and measurement range is 0-300VA, and measuring resolution is 0.01VA.
The present invention describes according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of the present invention's technology, can carry out many modifications and not break away from its protection domain the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection domain.

Claims (10)

1. a current transformer comprehensive tester is characterized in that, comprising: DSP control computing module, power amplifier output module, AD sampling module and data processing module;
Said DSP control computing module links to each other with said power amplifier output module, is used for test parameter according to the said data processing module setting control power amplifier output module that transmits control signal and produces required voltage source to current transformer;
Said DSP control computing module also links to each other with said AD sampling module, is used to control the AD sampling module and gathers required current transformer data;
Said data processing module links to each other with said DSP control computing module, is used to that test parameter is set, reads test result and preservation test data that said DSP control computing module according to the current transformer data computation of gathering.
2. current transformer comprehensive tester according to claim 1 is characterized in that, said DSP control computing module adopts the said control power amplifier of converter technique output module, the low pressure of the high pressure equivalence under output and the power frequency situation.
3. current transformer comprehensive tester according to claim 2 is characterized in that, said DSP control computing module carries out loss balancing to the data of gathering when calculating magnetic hysteresis loss or eddy current loss.
4. current transformer comprehensive tester according to claim 3 is characterized in that, said loss balancing compensates for the difference of the loss that produces under magnetic hysteresis loss or eddy current loss and the power frequency situation under the frequency of calculating said voltage source.
5. current transformer comprehensive tester according to claim 1 is characterized in that, said data processing module and DSP control computing module can be analyzed for the parameter of the current transformer of unknown parameters automatically.
6. current transformer comprehensive tester according to claim 1; It is characterized in that whether said data processing module and DSP control computing module can detect test wiring error automatically, detect institute's device of surveying automatically is current transformer, removes according to test environment and test interference automatically.
7. according to any described current transformer comprehensive tester among the claim 1-6; It is characterized in that said power amplifier output module links to each other with the secondary circuit of said current transformer, required control signal is sent to the secondary circuit of said current transformer; And said power amplifier output module is made up of output control module and amplifier; Output control module is controlled by FPGA, adopts high-resolution D/A converter, and amplifier adopts metering level high precision switching amplifier.
8. current transformer comprehensive tester according to claim 7 is characterized in that, said AD sampling module links to each other with secondary circuit with the primary circuit of said current transformer simultaneously, gathers the primary circuit of current transformer and the data of secondary circuit simultaneously.
9. according to any described current transformer comprehensive tester among the claim 1-6; It is characterized in that; Said current transformer comprehensive tester also comprises human-computer interaction module, links to each other with said data processing module, is used for acceptance test instruction and shows test results.
10. current transformer comprehensive tester according to claim 1; It is characterized in that; Said current transformer comprehensive tester also comprises and is used for the network interface module that links to each other with PC, receives PC control of software test signal, and test data is uploaded PC go up and generate report.
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