CN105974344A - Calibration system and method for relative dielectric loss and electric capacity detector - Google Patents
Calibration system and method for relative dielectric loss and electric capacity detector Download PDFInfo
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- CN105974344A CN105974344A CN201610244210.4A CN201610244210A CN105974344A CN 105974344 A CN105974344 A CN 105974344A CN 201610244210 A CN201610244210 A CN 201610244210A CN 105974344 A CN105974344 A CN 105974344A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention relates to a calibration system which is used for carrying out calibration on a relative dielectric loss and electric capacity detector. The calibration system comprises a detector calibration device and a relative dielectric loss and electric capacity detector, wherein the detector calibration device is used for setting an initial value of an original excitation signal, generating an original excitation signal according to the initial value, converting the original excitation signal into a fundamental sinusoidal signal, determining a standard reference voltage signal and a standard reference current signal according to the fundamental sinusoidal signal, and sending the standard reference voltage signal and the standard reference current signal to the relative dielectric loss and electric capacity detector; and the relative dielectric loss and electric capacity detector is used for receiving the standard reference voltage signal and the standard reference current signal, detecting a dielectric loss factor and the electric capacity according to the standard reference voltage signal and the standard reference current signal, and comparing the detected dielectric loss factor and the detected electric capacity with a standard dielectric loss factor and the standard electric capacity respectively so as to carry out calibration.
Description
Technical field
The present invention relates to measurement and calibration field, and more particularly, to a kind of relative dielectric loss and the calibration system and method for capacitance detector.
Background technology
Medium loss test is the most all content important in power system insulation preventive trial.Obtain dielectric dissipation factor and the measurement result of capacitance by medium loss test, judge the insulation status of equipment in conjunction with historical data and contemporaneous data.Dielectric loss and capacitance detector are to measure capacitive apparatus medium loss factor and the equipment of capacitance based on the absolute method of measurement or relative measurement method.The absolute method of measurement is according to dielectric dissipation factor and the capacitance calculating detected equipment with bus PT secondary voltage and detected device current.Relative measurement method is to calculate detected equipment and the relative medium loss factor of reference device and capacitance ratio according to detected device current signal and other capacitance type equipment current signal in parallel with detected equipment.Owing to dielectric loss and capacitance detector belong to live detection instrument, use relative measurement method first can avoid the impact of PT angular difference；Secondly the uncertain factor that ambient temperature and humidity, voltage magnitude frequency fluctuation, load capacity change introduce can be overcome.
Therefore Ge Wangsheng company DianKeYuan, prefecture-level company and supertension company are proposed configuration capacitive apparatus relative to dielectric loss and the requirement of capacitance detector in [2010] No. 212 files of electricity " notice about printing and distributing<charged electric power apparatus detecting instrument equipping rules (trying)>" that change that State Grid Corporation of China issues.
The capacitive apparatus used in power system at present is varied relative to dielectric loss and capacitance detector model, and metering performance is uneven.If in actual use, measurement result is inaccurate, may cause the erroneous judgement to apparatus insulated situation, causes unnecessary loss.Therefore it is the most necessary for verifying capacitive apparatus relative to dielectric loss and capacitance detector.
Summary of the invention
In order to solve the problems referred to above, the present invention provides a kind of calibration steps, and for calibrating relative dielectric loss and capacitance detector, described method includes:
Initial value according to original excitation signal produces original excitation signal；
Described original excitation signal is converted to basic sinusoidal signal；
Canonical reference voltage signal and normal reference current signal is determined according to described basic sinusoidal signal；
According to described canonical reference voltage signal and normal reference current signal detection dielectric dissipation factor and capacitance；And
Compare to calibrate by dielectric dissipation factor and the capacitance of the dielectric dissipation factor detected and capacitance with standard.
Preferably, wherein also included before the initial value according to original excitation signal produces original excitation signal: the initial value of original excitation signal is set.
Preferably, dielectric dissipation factor and the capacitance prestoring described standard is also included.
Preferably, described dielectric dissipation factor and capacitance by the dielectric dissipation factor detected and capacitance with standard compares to carry out calibration and includes: when the absolute value of the dielectric dissipation factor of the dielectric dissipation factor detected and capacitance and standard and the difference of capacitance is less than threshold value, do not calibrate relative dielectric loss and capacitance detector.
Preferably, described dielectric dissipation factor and capacitance by the dielectric dissipation factor detected and capacitance with standard compares to carry out calibration and includes: when the absolute value of the dielectric dissipation factor of the dielectric dissipation factor detected and capacitance and standard and the difference of capacitance is more than threshold value, calibrate relative dielectric loss and capacitance detector.
According to a further aspect in the invention, it is provided that a kind of calibrating installation, for calibrating relative dielectric loss and capacitance detector, described calibrating installation includes:
Host computer, for arranging the initial value of original excitation signal；And
Standard source unit, for producing original excitation signal according to described initial value, original excitation signal is converted to basic sinusoidal signal, determine canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal, and described canonical reference voltage signal is sent to normal reference current signal relative dielectric loss and capacitance detector.
Preferably, described standard source unit includes:
Signal generating unit, uses Direct Digital Synthesizer and the initial value according to original excitation signal to produce original excitation signal；
Signal condition unit, for being converted to basic sinusoidal signal by original excitation signal；
Precision current source unit, generates normal reference current signal according to basic sinusoidal signal；And
Accurate voltage source unit, generates canonical reference voltage signal according to basic sinusoidal signal.
Preferably, wherein described precision current source unit and accurate voltage source unit are carried out electrical isolation, to reduce signal cross-talk.
Preferably, wherein said precision current source unit is precision constant current source unit, and described accurate voltage source unit is accurate constant pressure source unit.
According to another aspect of the invention, it is provided that a kind of calibration system, for calibrating relative dielectric loss and capacitance detector, described system includes:
Detector calibrating installation, for arranging the initial value of original excitation signal and producing original excitation signal according to described initial value, original excitation signal is converted to basic sinusoidal signal, determines canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal and described canonical reference voltage signal is sent to normal reference current signal relative dielectric loss and capacitance detector；And
Dielectric loss and capacitance detector relatively, for receiving described canonical reference voltage signal and normal reference current signal, according to described canonical reference voltage signal and normal reference current signal detection dielectric dissipation factor and capacitance, compare to calibrate by dielectric dissipation factor and the capacitance of the dielectric dissipation factor detected and capacitance with standard.
Accompanying drawing explanation
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by:
Fig. 1 is the structural representation of the calibration system according to embodiment of the present invention；
Fig. 2 is the logical structure schematic diagram of the standard source unit according to embodiment of the present invention；
Fig. 3 is the electrical block diagram of the standard source unit according to embodiment of the present invention；And
Fig. 4 is the flow chart of the calibration steps according to embodiment of the present invention.
Detailed description of the invention
With reference now to accompanying drawing, introduce the illustrative embodiments of the present invention, but, the present invention can implement by many different forms, and it is not limited to embodiment described herein, thering is provided these embodiments is at large and fully disclose the present invention, and fully passes on the scope of the present invention to person of ordinary skill in the field.It is not limitation of the invention for representing the term in illustrative embodiments in the accompanying drawings.In the accompanying drawings, identical cells/elements uses identical reference.
Except as otherwise noted, person of ordinary skill in the field is had and common understands implication by term used herein (including scientific and technical terminology).Further it will be understood that the term limited with normally used dictionary, it should it is understood to that the linguistic context in field associated therewith has consistent implication, and is not construed as Utopian or the most formal meaning.
Fig. 1 is the structural representation of the calibration system according to embodiment of the present invention.As it is shown in figure 1, calibration system 100 is for calibrating relative dielectric loss and capacitance detector.Calibration system 100 metering performance of embodiment of the present invention is substantially improved than calibrator (-ter) unit of the prior art and measurement result is accurate, thus avoids causing the erroneous judgement situation to apparatus insulated situation.Preferably, calibration system 100 includes detector calibrating installation 101 and relative dielectric loss and capacitance detector 102.
According to the preferred embodiment of the present invention, original excitation signal, for arranging the initial value of original excitation signal and producing original excitation signal according to described initial value, is converted to basic sinusoidal signal by detector calibrating installation 101.Detector calibrating installation 101 determines canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal and described canonical reference voltage signal is sent to normal reference current signal relative dielectric loss and capacitance detector.
Preferably, detector calibrating installation 101 includes host computer 103 and standard source unit 104.Preferably, host computer is for arranging the initial value of original excitation signal.Normally, host computer 103 provides and provides the user interface (such as, touch screen), so that user can operate host computer 103 by interface.Preferably, host computer 103 can include that display screen is to show the information such as the initial value of original excitation signal.
Preferably, original excitation signal, for producing original excitation signal according to described initial value, is converted to basic sinusoidal signal, determines canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal by standard source unit 104.Normally, standard source unit 104 is used for generating canonical reference voltage signal and normal reference current signal, for being supplied to relative dielectric loss and capacitance detector.First, standard source unit 104 produces original excitation signal according to the initial value set by host computer；Then, original excitation signal is converted to basic sinusoidal signal by standard source unit 104；Finally, standard source unit 104 is with determining canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal.Preferably, canonical reference voltage signal can be supplied to relative dielectric loss and capacitance detector by standard source unit 104 with normal reference current signal.As it is shown in figure 1, a quasi-reference voltage signal of road sign can be supplied to relative dielectric loss and capacitance detector with two-way normal reference current signal by standard source unit 104.
According to the preferred embodiment of the present invention, dielectric loss and capacitance detector 102 relatively receives described canonical reference voltage signal and normal reference current signal, and according to described canonical reference voltage signal and normal reference current signal detection dielectric dissipation factor and capacitance.Relatively dielectric loss and capacitance detector 102 compares according to the dielectric dissipation factor of the dielectric dissipation factor detected and capacitance and standard and capacitance and calibrates.Preferably, when relative dielectric loss and capacitance detector 102 use overlong time or during by other influences, may result in sensitivity and decline.The measurement result that the decline of this sensitivity can have a strong impact on relative dielectric loss and capacitance detector 102 is inaccurate.If in actual use, measurement result is inaccurate, may cause the erroneous judgement to apparatus insulated situation, causes unnecessary loss.
Preferably, calibration system can prestore dielectric dissipation factor and the capacitance of standard.Normally, the dielectric dissipation factor of standard and capacitance are that relative dielectric loss and capacitance detector are after receiving canonical reference voltage signal and normal reference current signal, it should the dielectric dissipation factor detected and the ideal value of capacitance.But, in reality is measured, relative dielectric loss and capacitance detector are usually present error.Normally, error in the reasonable scope does not interferes with measurement result, and the error outside zone of reasonableness can affect measurement result.
The preferred embodiment of the present invention compares according to the dielectric dissipation factor of the dielectric dissipation factor detected and capacitance and standard and capacitance calibrates.Generally, when the dielectric dissipation factor detected and capacitance are less than threshold value with the dielectric dissipation factor of standard and the difference (such as, the absolute value of difference) of capacitance, it is not necessary to relative dielectric loss and capacitance detector 102 are calibrated.And, when the dielectric dissipation factor detected and capacitance are more than threshold value with the dielectric dissipation factor of standard and the difference (such as, the absolute value of difference) of capacitance, relative dielectric loss and capacitance detector 102 are calibrated.Measurement result in order to ensure the relative dielectric loss after calibration and capacitance detector 102 meets the requirements; would generally be to the relative dielectric loss after calibration and capacitance detector 102 recalibration process, until the dielectric dissipation factor detected and capacitance are less than threshold value with the dielectric dissipation factor of standard and the difference of capacitance.
Fig. 2 is the logical structure schematic diagram of the standard source unit according to embodiment of the present invention.As in figure 2 it is shown, standard source unit 200 includes: signal generating unit 201, signal condition unit 202, precision current source unit 203-1 and 203-2 and accurate voltage source unit 204.Preferably, detector calibrating installation 200 is for arranging the initial value of original excitation signal and producing original excitation signal according to described initial value, original excitation signal is converted to basic sinusoidal signal, determines canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal and described canonical reference voltage signal is sent to normal reference current signal relative dielectric loss and capacitance detector.
Preferably, signal generating unit 201, use Direct Digital Synthesizer and the initial value according to original excitation signal to produce original excitation signal.Preferably, signal condition unit 202, for being converted to basic sinusoidal signal by original excitation signal.Preferably, precision current source unit 203-1 and 203-2, generate normal reference current signal according to basic sinusoidal signal.Preferably, accurate voltage source unit, generate canonical reference voltage signal according to basic sinusoidal signal.
Fig. 3 is the electrical block diagram of the standard source unit according to embodiment of the present invention.As it is shown on figure 3, standard source unit 300 includes: DDS(Direct Digital Synthesizer) chip 301, signal conditioning circuit 302, signal amplification circuit 303, controlled constant-current source circuit 304 and voltage source module circuit 305.Preferably, standard source unit 300 is for arranging the initial value of original excitation signal and producing original excitation signal according to described initial value, original excitation signal is converted to basic sinusoidal signal, determines canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal and described canonical reference voltage signal is sent to normal reference current signal relative dielectric loss and capacitance detector.
Preferably, DDS(Direct Digital Synthesizer) chip 201 produces original excitation signal according to the initial value of original excitation signal.Preferably, signal conditioning circuit 202, for being converted to basic sinusoidal signal by original excitation signal.Preferably, signal amplification circuit 303 is for being amplified the signal of signal conditioning circuit 202 output.Preferably, controlled constant-current source circuit 304, generate normal reference current signal according to basic sinusoidal signal.Preferably, voltage source module circuit 305, generate canonical reference voltage signal according to basic sinusoidal signal.
Fig. 4 is the flow chart of the calibration steps according to embodiment of the present invention.As shown in Figure 4, method 400 is from the beginning of step 401 place.Calibration steps 400 metering performance of embodiment of the present invention is substantially improved than calibrator (-ter) unit of the prior art and measurement result is accurate, thus avoids causing the erroneous judgement situation to apparatus insulated situation.
Preferably, in step 401, original excitation signal is produced according to the initial value of original excitation signal.Method 400 utilizes host computer to arrange the initial value of original excitation signal.Normally, host computer provides and provides the user interface (such as, touch screen), so that user can operate host computer by interface.Preferably, host computer can include that display screen is to show the information such as the initial value of original excitation signal.
Preferably, also included before the initial value according to original excitation signal produces original excitation signal: the initial value of original excitation signal is set.
Preferably, in step 402, original excitation signal is converted to basic sinusoidal signal.Preferably, method 400 produces original excitation signal according to initial value, and original excitation signal is converted to basic sinusoidal signal.
Preferably, in step 403, canonical reference voltage signal and normal reference current signal are determined according to described basic sinusoidal signal.Preferably, method 400 uses standard source unit to determine canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal.Preferably, canonical reference voltage signal can be supplied to relative dielectric loss and capacitance detector by standard source unit with normal reference current signal.Preferably, a quasi-reference voltage signal of road sign can be supplied to relative dielectric loss and capacitance detector with two-way normal reference current signal by method 400.
Preferably, in step 404, according to described canonical reference voltage signal and normal reference current signal detection dielectric dissipation factor and capacitance.
Preferably, in step 405, compare to calibrate by dielectric dissipation factor and the capacitance of the dielectric dissipation factor detected and capacitance with standard.Preferably, described dielectric dissipation factor and capacitance by the dielectric dissipation factor detected and capacitance with standard compares to carry out calibration and includes: when the dielectric dissipation factor detected and capacitance and the dielectric dissipation factor of standard and the difference of capacitance are less than threshold value, do not calibrate relative dielectric loss and capacitance detector.Preferably, described dielectric dissipation factor and capacitance by the dielectric dissipation factor detected and capacitance with standard compares to carry out calibration and includes: when the dielectric dissipation factor detected and capacitance and the dielectric dissipation factor of standard and the difference of capacitance are more than threshold value, calibrate relative dielectric loss and capacitance detector.
Measurement result in order to ensure the relative dielectric loss after calibration and capacitance detector meets the requirements; would generally be to the relative dielectric loss after calibration and capacitance detector recalibration process, until the dielectric dissipation factor detected and capacitance are less than threshold value with the dielectric dissipation factor of standard and the difference of capacitance.
Preferably, described method 400 also includes dielectric dissipation factor and the capacitance prestoring described standard.
By describing the present invention with reference to a small amount of embodiment.But, known in those skilled in the art, as subsidiary Patent right requirement is limited, except the present invention other embodiment disclosed above falls within the scope of the present invention equally.
Normally, all terms used in the claims are all explained in the usual implication of technical field according to them, unless additionally defined clearly wherein.All of reference " one/described/be somebody's turn to do [device, assembly etc.] " is construed at least one example in described device, assembly etc. with being all opened, unless otherwise expressly specified.The step of any method disclosed herein all need not be run, unless explicitly stated otherwise with disclosed order accurately.
Claims (10)
1. a calibration steps, for calibrating relative dielectric loss and capacitance detector, described method includes:
Initial value according to original excitation signal produces original excitation signal；
Described original excitation signal is converted to basic sinusoidal signal；
Canonical reference voltage signal and normal reference current signal is determined according to described basic sinusoidal signal；
According to described canonical reference voltage signal and normal reference current signal detection dielectric dissipation factor and capacitance；And
Compare to calibrate by dielectric dissipation factor and the capacitance of the dielectric dissipation factor detected and capacitance with standard.
Calibration steps the most according to claim 1, wherein also included: arrange the initial value of original excitation signal before the initial value according to original excitation signal produces original excitation signal.
Calibration steps the most according to claim 1, also includes dielectric dissipation factor and the capacitance prestoring described standard.
Calibration steps the most according to claim 1, described dielectric dissipation factor and capacitance by the dielectric dissipation factor detected and capacitance with standard compares to carry out calibration and includes: when the absolute value of the dielectric dissipation factor of the dielectric dissipation factor detected and capacitance and standard and the difference of capacitance is less than threshold value, do not calibrate relative dielectric loss and capacitance detector.
Calibration steps the most according to claim 1, described dielectric dissipation factor and capacitance by the dielectric dissipation factor detected and capacitance with standard compares to carry out calibration and includes: when the absolute value of the dielectric dissipation factor of the dielectric dissipation factor detected and capacitance and standard and the difference of capacitance is more than threshold value, calibrate relative dielectric loss and capacitance detector.
6. a calibrating installation, for calibrating relative dielectric loss and capacitance detector, described calibrating installation includes:
Host computer, for arranging the initial value of original excitation signal；And
Standard source unit, for producing original excitation signal according to described initial value, original excitation signal is converted to basic sinusoidal signal, determine canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal, and described canonical reference voltage signal is sent to normal reference current signal relative dielectric loss and capacitance detector.
Calibrating installation the most according to claim 6, described standard source unit includes:
Signal generating unit, uses Direct Digital Synthesizer and the initial value according to original excitation signal to produce original excitation signal；
Signal condition unit, for being converted to basic sinusoidal signal by original excitation signal；
Precision current source unit, generates normal reference current signal according to basic sinusoidal signal；And
Accurate voltage source unit, generates canonical reference voltage signal according to basic sinusoidal signal.
Calibrating installation the most according to claim 7, wherein carries out electrical isolation to described precision current source unit and accurate voltage source unit, to reduce signal cross-talk.
Calibrating installation the most according to claim 7, wherein said precision current source unit is precision constant current source unit, and described accurate voltage source unit is accurate constant pressure source unit.
10. a calibration system, for calibrating relative dielectric loss and capacitance detector, described system includes:
Detector calibrating installation, for arranging the initial value of original excitation signal and producing original excitation signal according to described initial value, original excitation signal is converted to basic sinusoidal signal, determines canonical reference voltage signal and normal reference current signal according to described basic sinusoidal signal and described canonical reference voltage signal is sent to normal reference current signal relative dielectric loss and capacitance detector；And
Dielectric loss and capacitance detector relatively, for receiving described canonical reference voltage signal and normal reference current signal, according to described canonical reference voltage signal and normal reference current signal detection dielectric dissipation factor and capacitance, compare to calibrate by dielectric dissipation factor and the capacitance of the dielectric dissipation factor detected and capacitance with standard.
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Cited By (3)
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| CN106443199A (en) * | 2016-10-17 | 2017-02-22 | 中国电力科学研究院 | Capacitance and dielectric loss measurement system and method of electrically insulating material |
| CN109581264A (en) * | 2019-01-08 | 2019-04-05 | 任守华 | A kind of capacitance and dielectric loss standard |
| CN111521965A (en) * | 2020-05-08 | 2020-08-11 | 广东电网有限责任公司电力科学研究院 | Transformer bushing dielectric loss detection device correction system and method |
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| CN102313876A (en) * | 2010-07-05 | 2012-01-11 | 河南电力试验研究院 | Calibrating device for fully automated high-voltage dielectric loss tester |
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