CN203799005U - Error verification system for high-voltage metering box - Google Patents
Error verification system for high-voltage metering box Download PDFInfo
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- CN203799005U CN203799005U CN201420199647.7U CN201420199647U CN203799005U CN 203799005 U CN203799005 U CN 203799005U CN 201420199647 U CN201420199647 U CN 201420199647U CN 203799005 U CN203799005 U CN 203799005U
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Abstract
The utility model discloses an error verification system for a high-voltage metering box. The error verification system comprises a three-phase mutual inductor calibrator, a first three-phase program-controlled source, a second three-phase program-controlled source, three current boosters, a voltage booster, three standard current transformers, a standard voltage transformer, the current differencing circuit and three voltage differencing circuit, and a control signal communication end of the three-phase mutual inductor calibrator is respectively connected with the first three-phase program-controlled source and the second three-phase program-controlled source. According to the error verification system, the verification of the high-voltage metering box is identical with the actual operation state by adopting the thee-phase testing method, the error verification and temperature rise test carried out under such condition best conform to the reality, and the verification accuracy of tested objects can be ensured.
Description
Technical field
The utility model relates to electric-power metering technical field of measurement and test, refers to particularly a kind of High-voltage measuring box error testing system.
Background technology
High-voltage measuring box due to simple in structure, easy for installation, take up an area the advantages such as little, there are every year a large amount of production and use at power high voltage metering field, and this kind equipment is installed on large user mostly and private station becomes, do critical point metering, the quality of its performance is directly connected to the accuracy of electric energy metrical and the safe operation of power department, and its accuracy that detects error directly has influence on the fair and just of electric energy trade settlement.
At present, the error-tested method of High-voltage measuring box is the error by respectively the single voltage transformer (VT) summation current transformer in High-voltage measuring box is tested to obtain High-voltage measuring box in the situation that High-voltage measuring box is shut down.But High-voltage measuring box is operated under high voltage, current state, when real work, current transformer and voltage transformer (VT) influence each other because of the existence of electromagnetic field, in addition, current transformer can be subject to high-tension impact, and voltage transformer (VT) also can be subject to the impact of large current field.These influence factors cause data that current method of calibration (, in the situation that High-voltage measuring box is shut down, respectively the single voltage transformer (VT) summation current transformer in High-voltage measuring box being tested to obtain the error of High-voltage measuring box) the obtains error under can not accurate response High-voltage measuring box actual motion state.
For the certificate test of High-voltage measuring box, domestic no matter be manufacturing firm, or the measurement centre of technical supervision testing agency and power department all adopts single-phase transformers standard calibrating device respectively the each phase current mutual inductor of High-voltage measuring box and voltage transformer (VT) to be detected.Requirement according to JJG1021-2007 " electric power mutual-inductor vertification regulation " to electric power mutual-inductor operation variation, because High-voltage measuring box is simple in structure, compact, its actual running status on the impact of voltage, current transformer error with regard to particular importance.In the time that High-voltage measuring box unreasonable structure or electromagnetic screen are dealt with improperly, under running status, will introduce very large additive error, move variation.And existing individual event calibration method and equipment can not be made real evaluation to the error of High-voltage measuring box, certainly will have influence on the fair and just property of electric energy trade settlement.
Reference literature: measurement verification regulations JJG1021-2007 " electric power mutual-inductor vertification regulation ".
Utility model content
The purpose of this utility model will provide a kind of High-voltage measuring box error testing system exactly, actual metered error when this error testing system can accurately be examined and determine out High-voltage measuring box work.
For realizing this object, the High-voltage measuring box error testing system that the utility model is designed, it is characterized in that: it comprises that three-phase mutual-inductor tester, the first three-phase program-controlled source, the second three-phase program-controlled source, three current lifting devices, a stepup transformer, three standard current transformers, a standard potential transformer, three electric currents ask differential mode piece and three voltages to ask differential mode piece, and the control signal communication ends of described three-phase mutual-inductor tester connects respectively the first three-phase program-controlled source and the second three-phase program-controlled source;
The be connected input end of the first current lifting device of the A in described the first three-phase program-controlled source, the be connected input end of the second current lifting device of the B in the first three-phase program-controlled source, the be connected input end of the 3rd current lifting device of the C in the first three-phase program-controlled source, the noble potential output terminal of the first current lifting device connects the noble potential input end of the first standard current transformer, the electronegative potential input end of the first standard current transformer connects the noble potential input end of the first batch meter current transformer to be measured, and the electronegative potential input end of the first batch meter current transformer to be measured connects the electronegative potential output terminal of the first current lifting device, the noble potential output terminal of the second current lifting device connects the noble potential input end of the second standard current transformer, the electronegative potential input end of the second standard current transformer connects the second batch meter current transformer noble potential input end to be measured, and the electronegative potential input end of the second batch meter current transformer to be measured connects the electronegative potential output terminal of the second current lifting device, the noble potential output terminal of the 3rd current lifting device connects the noble potential input end of the 3rd standard current transformer, the electronegative potential input end of the 3rd standard current transformer connects the noble potential input end of the 3rd batch meter current transformer to be measured, and the electronegative potential input end of the 3rd batch meter current transformer to be measured connects the electronegative potential output terminal of the 3rd current lifting device, the first standard current transformer, the second standard current transformer is connected respectively with the first output terminal of the 3rd standard current transformer the electric current dial gauge input end that three-phase mutual-inductor tester is corresponding, the second output terminal of the first standard current transformer is connected respectively the first electric current with the output terminal of the first batch meter current transformer to be measured and asks the input end that differential mode piece is corresponding, the second output terminal of the second standard current transformer is connected respectively the second electric current with the output terminal of the second batch meter current transformer to be measured and asks the input end that differential mode piece is corresponding, the second output terminal of the 3rd standard current transformer is connected respectively the 3rd electric current with the output terminal of the 3rd batch meter current transformer to be measured and asks the input end that differential mode piece is corresponding, the first electric current is asked differential mode piece, the second electric current asks differential mode piece and the 3rd electric current to ask the output terminal of differential mode piece to be all connected the three-phase error input end of three-phase mutual-inductor tester by gauge tap group,
The be connected input end of stepup transformer A phase of the A in described the second three-phase program-controlled source, the be connected input end of stepup transformer B phase of the B in the second three-phase program-controlled source, the be connected input end of stepup transformer C phase of the C in the second three-phase program-controlled source, the input end of the output terminal difference connection standard voltage transformer (VT) A phase of stepup transformer A phase and the input end of batch meter voltage transformer (VT) A phase to be measured, the input end of the output terminal difference connection standard voltage transformer (VT) B phase of stepup transformer B phase and the input end of batch meter voltage transformer (VT) B phase to be measured, the input end of the output terminal difference connection standard voltage transformer (VT) C phase of stepup transformer C phase and the input end of batch meter voltage transformer (VT) C phase to be measured, standard potential transformer A phase, standard potential transformer B phase is connected respectively with the first output terminal of standard potential transformer C phase the voltage dial gauge input end that three-phase mutual-inductor tester is corresponding, the second output terminal of standard potential transformer A phase is connected respectively the first voltage with the output terminal of batch meter voltage transformer (VT) A phase to be measured and asks the input end that differential mode piece is corresponding, the second output terminal of standard potential transformer B phase is connected respectively second voltage with the output terminal of batch meter voltage transformer (VT) B phase to be measured and asks the input end that differential mode piece is corresponding, the second output terminal of standard potential transformer C phase is connected respectively tertiary voltage with the output terminal of batch meter voltage transformer (VT) C phase to be measured and asks the input end that differential mode piece is corresponding, the first voltage is asked differential mode piece, second voltage asks differential mode piece and tertiary voltage to ask the output terminal of differential mode piece to be all connected the three-phase error input end of three-phase mutual-inductor tester by gauge tap group.
Described three-phase mutual-inductor tester comprises input port, signal condition and filtration module, the data processing unit of integrated signal sampling and signal isolation and digital signal processing function, the control panel being connected with data processing unit, the display screen being connected with data processing unit, wherein, described input port is by the signal input part of signal condition and filtration module connection data processing unit, the control signal communication ends of data processing unit connects respectively the control end in the first three-phase program-controlled source and the second three-phase program-controlled source, described input port comprises electric current dial gauge input end, voltage dial gauge input end and three-phase error input end.
The network service end of described data processing unit is connected with host computer.
Described data processing unit comprises data sampling module, photoelectric isolation module and digital signal processing module, and wherein, the signal input part of data sampling module connects input port, and data sampling module connects digital signal processing module by photoelectric isolation module.
The beneficial effects of the utility model:
1, the utility model use calibrating that three-phase test macro makes High-voltage measuring box completely with actual motion state consistency, under such condition, doing error testing and temperature rise test is to meet reality most, can ensure the accuracy that test specimen is examined and determine; In addition, the utility model passes into test specimen three-phase current and the three-phase voltage of regulation, can carry out high-speed high-precision sampling and adopt Fast Fourier Transform (FFT) technology three-phase simultaneously, calculate ratio, angular difference, when having overcome the phase shift of traditional employing capacitance-resistance and having tested angular difference, electric capacity is with temperature, problem that frequency change is large, thereby improved stability and the precision of test result;
2, staff only needs primary connection, can complete the detection of current transformer unit and the voltage transformer (VT) unit of whole batch meter, has reduced workload.
Brief description of the drawings
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is the structured flowchart of three-phase mutual-inductor tester in the utility model;
Fig. 3 is the structured flowchart of data processing unit in the utility model.
Wherein, 1-three-phase mutual-inductor tester, 1.1-input port, 1.2-signal condition and filtration module, 1.3-data processing unit, 1.4-control panel, 1.5-display screen, the 2-the first three-phase program-controlled source, the 3-the second three-phase program-controlled source, the 4-the first current lifting device, the 4.1-the second current lifting device, the 4.2-the three current lifting device, 5-stepup transformer A phase, 5.1-stepup transformer B phase, 5.2-stepup transformer C phase, the 6-the first standard current transformer, the 6.1-the second standard current transformer, the 6.2-the three standard current transformer, 7-standard potential transformer A phase, 7.1-standard potential transformer B phase, 7.2-standard potential transformer C phase, the 8-the first batch meter current transformer to be measured, the 8.1-the second batch meter current transformer to be measured, the 8.2-the three batch meter current transformer to be measured, the 9-the first electric current is asked differential mode piece, the 9.1-the second electric current is asked differential mode piece, the 9.2-the three electric current is asked differential mode piece, 10-switches set, 11-batch meter voltage transformer (VT) A phase to be measured, 11.1-batch meter voltage transformer (VT) B phase to be measured, 11.2-batch meter voltage transformer (VT) C phase to be measured, the 12-the first voltage is asked differential mode piece, 12.1-second voltage is asked differential mode piece, 12.2-tertiary voltage is asked differential mode piece, 13-host computer.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
High-voltage measuring box error testing system as shown in Figures 1 to 3, it is characterized in that: it comprises that three-phase mutual-inductor tester 1, the first three-phase program-controlled source 2, the second three-phase program-controlled source 3, three current lifting devices, a stepup transformer, three standard current transformers, a standard potential transformer, three electric currents ask differential mode piece and three voltages to ask differential mode piece, and the control signal communication ends of described three-phase mutual-inductor tester 1 connects respectively the first three-phase program-controlled source 2 and the second three-phase program-controlled source 3;
The be connected input end of the first current lifting device 4 of the A in described the first three-phase program-controlled source 2, the be connected input end of the second current lifting device 4.1 of the B in the first three-phase program-controlled source 2, the be connected input end of the 3rd current lifting device 4.2 of the C in the first three-phase program-controlled source 2, the noble potential output terminal of the first current lifting device 4 connects the noble potential input end of the first standard current transformer 6, the electronegative potential input end of the first standard current transformer 6 connects the noble potential input end of the first batch meter current transformer 8 to be measured, the electronegative potential input end of the first batch meter current transformer 8 to be measured connects the electronegative potential output terminal of the first current lifting device 4, the noble potential output terminal of the second current lifting device 4.1 connects the noble potential input end of the second standard current transformer 6.1, the electronegative potential input end of the second standard current transformer 6.1 connects the noble potential input end of the second batch meter current transformer 8.1 to be measured, and the electronegative potential input end of the second batch meter current transformer 8.1 to be measured connects the electronegative potential output terminal of the second current lifting device 4.1, the noble potential output terminal of the 3rd current lifting device 4.2 connects the noble potential input end of the 3rd standard current transformer 6.2, the electronegative potential input end of the 3rd standard current transformer 6.2 connects the noble potential input end of the 3rd batch meter current transformer 8.2 to be measured, and the electronegative potential input end of the 3rd batch meter current transformer 8.2 to be measured connects the electronegative potential output terminal of the 3rd current lifting device 4.2, the first standard current transformer 6, the second standard current transformer 6.1 and the first output terminal of the 3rd standard current transformer 6.2 are connected respectively the electric current dial gauge input end of three-phase mutual-inductor tester 1 correspondence, the second output terminal of the first standard current transformer 6 and the output terminal of the first batch meter current transformer 8 to be measured are connected respectively the first electric current asks the input end of differential mode piece 9 correspondences, the second output terminal of the second standard current transformer 6.1 and the output terminal of the second batch meter current transformer 8.1 to be measured are connected respectively the second electric current asks the input end of differential mode piece 9.1 correspondences, the second output terminal of the 3rd standard current transformer 6.2 and the output terminal of the 3rd batch meter current transformer 8.2 to be measured are connected respectively the 3rd electric current asks the input end of differential mode piece 9.2 correspondences, the first electric current is asked differential mode piece 9, the second electric current asks differential mode piece 9.1 and the 3rd electric current to ask the output terminal of differential mode piece 9.2 to be all connected the three-phase error input end of three-phase mutual-inductor tester 1 by gauge tap group 10,
The A in described the second three-phase program-controlled source 3 mutually 5 the input end of stepup transformer A that is connected, the B in the second three-phase program-controlled source 3 mutually 5.1 the input end of stepup transformer B that is connected, the C in the second three-phase program-controlled source 3 mutually 5.2 the input end of stepup transformer C that is connected, stepup transformer A is 5 output terminal connection standard voltage transformer (VT) A 7 input end and batch meter voltage transformer (VT) A to be measured 11 input end mutually mutually respectively mutually, stepup transformer B is 5.1 output terminal connection standard voltage transformer (VT) B 7.1 input end and batch meter voltage transformer (VT) B to be measured 11.1 input end mutually mutually respectively mutually, stepup transformer C is 5.2 output terminal connection standard voltage transformer (VT) C 7.2 input end and batch meter voltage transformer (VT) C to be measured 11.2 input end mutually mutually respectively mutually, standard potential transformer A phase 7, standard potential transformer B mutually 7.1 with standard potential transformer C mutually the first output terminal of 7.2 be connected respectively the voltage dial gauge input end of three-phase mutual-inductor tester 1 correspondence, standard potential transformer A mutually the second output terminal of 7 and batch meter voltage transformer (VT) A to be measured mutually 11 output terminal be connected respectively the first voltage and ask the input end of differential mode piece 12 correspondences, standard potential transformer B mutually the second output terminal of 7.1 and batch meter voltage transformer (VT) B to be measured mutually 11.1 output terminal be connected respectively second voltage and ask the input end of differential mode piece 12.1 correspondences, standard potential transformer C mutually the second output terminal of 7.2 and batch meter voltage transformer (VT) C to be measured mutually 11.2 output terminal be connected respectively tertiary voltage and ask the input end of differential mode piece 12.2 correspondences, the first voltage is asked differential mode piece 12, second voltage asks differential mode piece 12.1 and tertiary voltage to ask the output terminal of differential mode piece 12.2 to be all connected the three-phase error input end of three-phase mutual-inductor tester 1 by gauge tap group 10.
In technique scheme, described three-phase mutual-inductor tester 1 comprises input port 1.1, signal condition and filtration module 1.2, the data processing unit 1.3 of integrated signal sampling and signal isolation and digital signal processing function, the control panel 1.4 being connected with data processing unit 1.3, the display screen 1.5 being connected with data processing unit 1.3, wherein, described input port 1.1 is by the signal input part of signal condition and filtration module 1.2 connection data processing units 1.3, the control signal communication ends of data processing unit 1.3 connects respectively the control end in the first three-phase program-controlled source 2 and the second three-phase program-controlled source 3, described input port 1.1 comprises electric current dial gauge input end, voltage dial gauge input end and three-phase error input end.
In technique scheme, the network service end of described data processing unit 1.3 is connected with host computer 13, and verification result is transferred to host computer 13 by described data processing unit 1.3.
In technique scheme, described data processing unit 1.3 comprises data sampling module, photoelectric isolation module and digital signal processing module, wherein, the signal input part of data sampling module connects input port 1.1, and data sampling module connects digital signal processing module by photoelectric isolation module.
In technique scheme, digital signal processing module is the TMS320F28335 signal processing chip that adopts Digital Signal Processing, and the chip model of data sampling module is AD7656.Photoelectric isolation module has ensured the isolation completely of mimic channel and digital circuit, has improved the antijamming capability of system.
In technique scheme, standard potential transformer is selected the standard potential transformer of having taked independent booster system and multi-voltage grade, can carry out wiring according to method of operation of different high pressure, meet the requirement that on-the-spot primary side is the different modes of connection, both can be used for single-phase detection and also can under the acting in conjunction of three-phase voltage and three-phase current, move, be convenient to observe and detect the amount of influencing each other of electric current and voltage circuit.
Utilize above-mentioned High-voltage measuring box error testing system to carry out a method for High-voltage measuring box error testing, it comprises the steps:
Step 1: the data communication end of the data processing unit 1.3 of three-phase mutual-inductor tester 1 transmits control signal to the first three-phase program-controlled source 2 and the second three-phase program-controlled source 3 respectively;
Step 2: control three electric currents by gauge tap group 10 and ask the output terminal of differential mode piece or three voltages to ask the output terminal of differential mode piece to connect the three-phase error input end of three-phase mutual-inductor tester 1;
In the time that three electric currents ask the output terminal of differential mode piece to connect the three-phase error input end of three-phase mutual-inductor tester 1, three-phase mutual-inductor tester 1 is controlled the A phase in the first three-phase program-controlled source 2, B phase and C be three current signals of output correspondence respectively mutually, above-mentioned three current signals flow to respectively corresponding three standard current transformers and three batch meter current transformers to be measured after three current lifting device up-flows of correspondence, now, the first standard current transformer 6, the second standard current transformer 6.1 and the 3rd standard current transformer 6.2 are respectively to the electric current dial gauge input end transfer criteria reference current signal of three-phase mutual-inductor tester 1, check whether the canonical reference current signal of now receiving reaches predefined check point, do not reach the situation that presets check point for canonical reference current signal, three-phase mutual-inductor tester 1 reaches canonical reference current signal to preset check point by controlling the first three-phase program-controlled source 2, then, the current signal that another group current signal that the first standard current transformer 6 is exported and the first batch meter current transformer 8 to be measured are exported asks differential mode piece 9 to ask poor by the first electric current, the first electric current asks differential mode piece 9 to ask poor result to flow to the three-phase error input end of three-phase mutual-inductor tester 1 in electric current, the current signal that another group current signal that the second standard current transformer 6.1 is exported and the second batch meter current transformer 8.1 to be measured are exported asks differential mode piece 9.1 to ask poor by the second electric current, the second electric current asks differential mode piece 9.1 to ask poor result to flow to the three-phase error input end of three-phase mutual-inductor tester 1 in electric current, the current signal that another group current signal that the 3rd standard current transformer 6.2 is exported and the 3rd batch meter current transformer 8.2 to be measured are exported asks differential mode piece 9.2 to ask poor by the 3rd electric current, three electric currents ask differential mode piece 9.2 to ask poor result to flow to the three-phase error input end of three-phase mutual-inductor tester 1 in electric current,
In the time that three voltages ask the output terminal of differential mode piece to connect the three-phase error input end of three-phase mutual-inductor tester 1, three-phase mutual-inductor tester 1 is controlled the A phase in the second three-phase program-controlled source 3, B phase and C be three voltage signals of output correspondence respectively mutually, above-mentioned three voltage signals are through corresponding stepup transformer A phase, B phase flows to respectively corresponding standard potential transformer A phase after boosting mutually with C, B phase and C phase and batch meter voltage transformer (VT) A phase to be measured, B phase and C phase, now, standard potential transformer A phase 7, standard potential transformer B mutually 7.1 and standard potential transformer C mutually 7.2 respectively to the voltage dial gauge input end transfer criteria reference voltage signal of three-phase mutual-inductor tester 1, check whether the canonical reference voltage signal of now receiving reaches predefined check point, do not reach the situation that presets check point for canonical reference voltage signal, three-phase mutual-inductor tester 1 reaches canonical reference voltage signal to preset check point by controlling the second three-phase program-controlled source 3, then, standard potential transformer A mutually another voltage signals of organizing voltage signal and 11 outputs of batch meter voltage transformer (VT) A to be measured phase of 7 outputs asks differential mode piece 12 to ask poor by the first voltage, the first voltage asks differential mode piece 12 to ask poor result to flow to the three-phase error input end of three-phase mutual-inductor tester 1 voltage, standard potential transformer B mutually another voltage signals of organizing voltage signal and 11.1 outputs of batch meter voltage transformer (VT) B to be measured phase of 7.1 outputs asks differential mode piece 12.1 to ask poor by second voltage, second voltage asks differential mode piece 12.1 to ask poor result to flow to the three-phase error input end of three-phase mutual-inductor tester 1 voltage, standard potential transformer C mutually another voltage signals of organizing voltage signal and 11.2 outputs of batch meter voltage transformer (VT) C to be measured phase of 7.2 outputs asks differential mode piece 12.2 to ask poor by tertiary voltage, tertiary voltage asks differential mode piece 12.2 to ask poor result to flow to the three-phase error input end of three-phase mutual-inductor tester 1 voltage,
Step 3: in the time that above-mentioned all canonical reference current signals and electric current ask poor consequential signal to be transported to signal condition and filtration module 1.2 by input port 1.1, signal condition and filtration module 1.2 ask poor consequential signal to carry out successively respectively three program control in the same way amplification processing to above-mentioned canonical reference current signal and electric current, stopping direct current processing, multiple is adjustable to be amplified and processes in the same way, second order Butterworth low-pass filtering treatment, above-mentioned signal after treatment is transported in data processing unit 1.3, data processing unit 1.3 carries out many signals fast Fourier algorithm and obtains the fundamental voltage amplitude of every phase canonical reference current signal and every phase current and ask the fundamental voltage amplitude of difference signal to above-mentioned signal after treatment, also obtain every phase canonical reference current signal and corresponding electric current simultaneously and ask the angle value between difference signal, then obtain ratio difference and the angular difference value of each batch meter current transformer to be measured according to the current transformer error definition of measurement verification regulations JJG1021-2007 " electric power mutual-inductor vertification regulation ",
In the time that above-mentioned all canonical reference voltage signals and voltage ask poor consequential signal to be transported to signal condition and filtration module 1.2 by input port 1.1, signal condition and filtration module 1.2 ask poor consequential signal to carry out successively respectively three program control in the same way amplification processing to above-mentioned canonical reference voltage signal and voltage, stopping direct current processing, multiple is adjustable to be amplified and processes in the same way, second order Butterworth low-pass filtering treatment, above-mentioned signal after treatment is transported in data processing unit 1.3, data processing unit 1.3 carries out many signals fast Fourier algorithm and obtains the fundamental voltage amplitude of every phase canonical reference voltage signal and every phase voltage and ask the fundamental voltage amplitude of difference signal to above-mentioned signal after treatment, also obtain every phase canonical reference voltage signal and corresponding voltage simultaneously and ask the angle value between difference signal, then obtain ratio difference and the angular difference value of batch meter voltage transformer (VT) to be measured according to the voltage transformer error definition of measurement verification regulations JJG1021-2007 " electric power mutual-inductor vertification regulation ".
Step 4: the data communication end of the data processing unit 1.3 of three-phase mutual-inductor tester 1 is according to predefined multiple check points (check point is selected with reference to measurement verification regulations JJG1021-2007 " electric power mutual-inductor vertification regulation "), send successively remaining many group control signal to the first three-phase program-controlled source 2 and the second three-phase program-controlled source 3 respectively, different current signals and voltage signal are exported in above-mentioned remaining every group of control signal control first three-phase program-controlled source 2 and the second three-phase program-controlled source 3, each current signal and voltage signal are processed according to the method for step 2 and step 3, obtain the fundamental voltage amplitude of every phase canonical reference current signal under different loads and every phase current and ask the fundamental voltage amplitude of difference signal, the ratio difference of each batch meter current transformer to be measured and angular difference value under different loads, under different loads, the fundamental voltage amplitude of every phase canonical reference voltage signal and every phase voltage are asked the fundamental voltage amplitude of difference signal, the ratio difference of batch meter voltage transformer (VT) to be measured and angular difference value under different loads.
In the step 2 and step 4 of technique scheme, be transported to canonical reference current signal in three-phase mutual-inductor tester 1 and canonical reference voltage signal as feedback signal, be used for determining that whether the control signal that three-phase mutual-inductor tester 1 carries is consistent with predefined check point.
In technique scheme, three-phase mutual-inductor tester 1 adopts fast Fourier algorithm to calculate ratio and the angular difference of three-phase simultaneously, has avoided hardware circuit to change the impact that data are caused with external environment condition, has also ensured the synchronous of three-phase data.Particularly now many single-phase testers adopt capacitance-resistance phase shift to test angular difference, and electric capacity is subject to the impact of temperature and frequency larger, and adopt fast Fourier algorithm just can avoid the problems referred to above, have improved stability and the precision of calibrating.
The content that this instructions is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1. a High-voltage measuring box error testing system, it is characterized in that: it comprises that three-phase mutual-inductor tester (1), the first three-phase program-controlled source (2), the second three-phase program-controlled source (3), three current lifting devices, a stepup transformer, three standard current transformers, a standard potential transformer, three electric currents ask differential mode piece and three voltages to ask differential mode piece, and the control signal communication ends of described three-phase mutual-inductor tester (1) connects respectively the first three-phase program-controlled source (2) and the second three-phase program-controlled source (3);
The be connected input end of the first current lifting device (4) of the A in described the first three-phase program-controlled source (2), the be connected input end of the second current lifting device (4.1) of the B in the first three-phase program-controlled source (2), the be connected input end of the 3rd current lifting device (4.2) of the C in the first three-phase program-controlled source (2), the noble potential output terminal of the first current lifting device (4) connects the noble potential input end of the first standard current transformer (6), the electronegative potential input end of the first standard current transformer (6) connects the noble potential input end of the first batch meter current transformer to be measured (8), the electronegative potential input end of the first batch meter current transformer to be measured (8) connects the electronegative potential output terminal of the first current lifting device (4), the noble potential output terminal of the second current lifting device (4.1) connects the noble potential input end of the second standard current transformer (6.1), the electronegative potential input end of the second standard current transformer (6.1) connects the noble potential input end of the second batch meter current transformer to be measured (8.1), and the electronegative potential input end of the second batch meter current transformer to be measured (8.1) connects the electronegative potential output terminal of the second current lifting device (4.1), the noble potential output terminal of the 3rd current lifting device (4.2) connects the noble potential input end of the 3rd standard current transformer (6.2), the electronegative potential input end of the 3rd standard current transformer (6.2) connects the noble potential input end of the 3rd batch meter current transformer to be measured (8.2), and the electronegative potential input end of the 3rd batch meter current transformer to be measured (8.2) connects the electronegative potential output terminal of the 3rd current lifting device (4.2), the first standard current transformer (6), the second standard current transformer (6.1) is connected respectively with the first output terminal of the 3rd standard current transformer (6.2) the electric current dial gauge input end that three-phase mutual-inductor tester (1) is corresponding, the second output terminal of the first standard current transformer (6) is connected respectively the first electric current with the output terminal of the first batch meter current transformer to be measured (8) and asks the input end that differential mode piece (9) is corresponding, the second output terminal of the second standard current transformer (6.1) is connected respectively the second electric current with the output terminal of the second batch meter current transformer to be measured (8.1) and asks the input end that differential mode piece (9.1) is corresponding, the second output terminal of the 3rd standard current transformer (6.2) is connected respectively the 3rd electric current with the output terminal of the 3rd batch meter current transformer to be measured (8.2) and asks the input end that differential mode piece (9.2) is corresponding, the first electric current is asked differential mode piece (9), the second electric current asks differential mode piece (9.1) and the 3rd electric current to ask the output terminal of differential mode piece (9.2) to be all connected the three-phase error input end of three-phase mutual-inductor tester (1) by gauge tap group (10),
The be connected input end of stepup transformer A phase (5) of the A in described the second three-phase program-controlled source (3), the be connected input end of stepup transformer B phase (5.1) of the B in the second three-phase program-controlled source (3), the be connected input end of stepup transformer C phase (5.2) of the C in the second three-phase program-controlled source (3), the input end of the output terminal difference connection standard voltage transformer (VT) A phase (7) of stepup transformer A phase (5) and the input end of batch meter voltage transformer (VT) A phase to be measured (11), the input end of the output terminal difference connection standard voltage transformer (VT) B phase (7.1) of stepup transformer B phase (5.1) and the input end of batch meter voltage transformer (VT) B phase to be measured (11.1), the input end of the output terminal difference connection standard voltage transformer (VT) C phase (7.2) of stepup transformer C phase (5.2) and the input end of batch meter voltage transformer (VT) C phase to be measured (11.2), standard potential transformer A phase (7), standard potential transformer B phase (7.1) is connected respectively with the first output terminal of standard potential transformer C phase (7.2) the voltage dial gauge input end that three-phase mutual-inductor tester (1) is corresponding, the second output terminal of standard potential transformer A phase (7) is connected respectively the first voltage with the output terminal of batch meter voltage transformer (VT) A phase to be measured (11) and asks the input end that differential mode piece (12) is corresponding, the second output terminal of standard potential transformer B phase (7.1) is connected respectively second voltage with the output terminal of batch meter voltage transformer (VT) B phase to be measured (11.1) and asks the input end that differential mode piece (12.1) is corresponding, the second output terminal of standard potential transformer C phase (7.2) is connected respectively tertiary voltage with the output terminal of batch meter voltage transformer (VT) C phase to be measured (11.2) and asks the input end that differential mode piece (12.2) is corresponding, the first voltage is asked differential mode piece (12), second voltage asks differential mode piece (12.1) and tertiary voltage to ask the output terminal of differential mode piece (12.2) to be all connected the three-phase error input end of three-phase mutual-inductor tester (1) by gauge tap group (10).
2. High-voltage measuring box error testing system according to claim 1, it is characterized in that: described three-phase mutual-inductor tester (1) comprises input port (1.1), signal condition and filtration module (1.2), the data processing unit (1.3) of integrated signal sampling and signal isolation and digital signal processing function, the control panel (1.4) being connected with data processing unit (1.3), the display screen (1.5) being connected with data processing unit (1.3), wherein, described input port (1.1) is by the signal input part of signal condition and filtration module (1.2) connection data processing unit (1.3), the control signal communication ends of data processing unit (1.3) connects respectively the control end in the first three-phase program-controlled source (2) and the second three-phase program-controlled source (3), described input port (1.1) comprises electric current dial gauge input end, voltage dial gauge input end and three-phase error input end.
3. High-voltage measuring box error testing system according to claim 2, is characterized in that: the network service end of described data processing unit (1.3) is connected with host computer (13).
4. High-voltage measuring box error testing system according to claim 2, it is characterized in that: described data processing unit (1.3) comprises data sampling module, photoelectric isolation module and digital signal processing module, wherein, the signal input part of data sampling module connects input port (1.1), and data sampling module connects digital signal processing module by photoelectric isolation module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420199647.7U CN203799005U (en) | 2014-04-23 | 2014-04-23 | Error verification system for high-voltage metering box |
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| CN201420199647.7U CN203799005U (en) | 2014-04-23 | 2014-04-23 | Error verification system for high-voltage metering box |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913715A (en) * | 2014-04-23 | 2014-07-09 | 国家电网公司 | High voltage metering box error verification system and error verification method |
| CN107219492A (en) * | 2017-04-24 | 2017-09-29 | 国网浙江省电力公司电力科学研究院 | Medium voltage network electric energy metrical high pressure integration semi-physical simulation device |
| CN109116288A (en) * | 2018-11-06 | 2019-01-01 | 云南电网有限责任公司电力科学研究院 | A kind of three-phase combination transformer calibrating installation |
-
2014
- 2014-04-23 CN CN201420199647.7U patent/CN203799005U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913715A (en) * | 2014-04-23 | 2014-07-09 | 国家电网公司 | High voltage metering box error verification system and error verification method |
| CN107219492A (en) * | 2017-04-24 | 2017-09-29 | 国网浙江省电力公司电力科学研究院 | Medium voltage network electric energy metrical high pressure integration semi-physical simulation device |
| CN109116288A (en) * | 2018-11-06 | 2019-01-01 | 云南电网有限责任公司电力科学研究院 | A kind of three-phase combination transformer calibrating installation |
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