CN106771645B - Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system - Google Patents

Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system Download PDF

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Publication number
CN106771645B
CN106771645B CN201611140977.9A CN201611140977A CN106771645B CN 106771645 B CN106771645 B CN 106771645B CN 201611140977 A CN201611140977 A CN 201611140977A CN 106771645 B CN106771645 B CN 106771645B
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voltage
capacitance
type potential
potential transformer
capacitance type
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CN106771645A (en
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黄嘉鹏
陈贤顺
刘鹍
马建龙
张福州
罗睿希
殷善锋
张翔
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2688Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
    • G01R27/2694Measuring dielectric loss, e.g. loss angle, loss factor or power factor
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605Measuring capacitance

Abstract

The invention discloses a kind of capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring systems, bus PT secondary voltage is obtained by voltage/current monitoring device, capacitance type potential transformer secondary voltage, piezoelectricity capacitance current in capacitance type potential transformer, voltage transformer intermediate transformer primary current, and the data of acquisition are sent to data processing equipment and are calculated, obtain capacitance type potential transformer high-voltage capacitance dielectric loss value, high-voltage electricity capacity, middle voltage capacitance dielectric loss value, middle piezoelectricity capacity, to realize that the automatic on-line to capacitance type potential transformer dielectric loss and capacitance monitors, explicit physical meaning, measurement result is accurate, be conducive to carry out accurate judgement and positioning to the abort situation of capacitance type potential transformer.Meanwhile dismounting lead of capacitance type potential transformer high pressure is avoided, the workload of in-site measurement is reduced, and all test jobs can be carried out in the case where not having a power failure, does not influence electric system normal power supply.

Description

Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system
Technical field
The present invention relates to power equipment performance monitoring technique fields, and in particular to capacitance type potential transformer dielectric loss and capacitor Measure on-line monitoring method and monitoring system.
Background technique
Voltage transformer and transformer are all the voltage on conversion line.But the purpose of transformer voltage of transformation is In order to convey electric energy, and the purpose of voltage transformer voltage of transformation, it is primarily used to supply to measuring instrumentss and protective relaying device Electricity.Capacitance type potential transformer (Capacitor Voltage Transformer, CVT) in recent years, making in the power system Dosage increasingly increases, however the electric capacitance change that occurs in use of capacitance type potential transformer and insulation ageing problem are led The intrinsic standoff ratio variation of cause directly affects the accuracy of measuring instrumentss measurement and stability, the public affairs of metering of protective relaying device work The safety of positivity and equipment.
Regulation in power industry standard DL/T596 " electrical equipment preventive test regulation ": to capacitance type potential transformer Want its capacitance of routine test and dielectric loss angle tangent (tan δ).On the one hand the regulation of above-mentioned routine test may not sent out Accident defect cannot be found in time when raw failure, led to equipment damage or left potential faults;On the other hand can be carried out need not The maintenance wanted increases cost.Therefore it to the on-line monitoring of capacitance type potential transformer, predicts and diagnoses fault in time, to ensuring The normal operation of electrical equipment, the reliability for improving power grid cut operating costs and protect equipment and the safety of operations staff All it is of great significance.
Current capacitance type potential transformer measurement method mainly has high-voltage capacitance bridge method, based on dielectric loss instrument mensuration and On-line monitoring method.High-voltage capacitance bridge method is exactly to measure capacitance using bridge balance, its advantage is that method is simple, Yi Shi Now, precision is relatively high, but since high-voltage capacitance bridge method is analogy method, is easy in testing ground by external electromagnetic field Interference, causes electric bridge that can not balance, measurement error is larger.Propose the improved method of high-voltage capacitance bridge method later, as screen method, Phase-shifting method etc., but still fail to solve the problems, such as that measurement error is big.Based on dielectric loss instrument mensuration by high-tension bridge, boosting transformation Device, standard capacitor become one, do not need other external equipments can complete independently test, its advantage is that anti-interference ability By force, easy to operate, measurement accuracy is high, but the test method belongs to a kind of off-line measurement method, and it is mutual to need to dismount voltage to be measured Lead of sensor high pressure increases the workload of in-site measurement, and all dismounting, test job need the case where having a power failure Lower development, influences electric system normal power supply.
Summary of the invention
The technical problem to be solved by the present invention is to capacitance type potential transformer dielectric loss and capacitances online, accurate measurements, And in-site measurement workload is further decreased, and it is an object of the present invention to provide capacitance type potential transformer dielectric loss and capacitance on-line monitoring side Method and monitoring system solve current measurement method measurement heavy workload, influence electric system normal power supply and measure inaccurate Really, error is big, fault location is inaccurate, the indefinite problem of physical significance.
The present invention is achieved through the following technical solutions:
Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method, including the following steps:
A, monitor bus PT secondary voltage, capacitance type potential transformer secondary voltage, piezoelectricity capacitance current in voltage transformer, Capacitance type potential transformer intermediate transformer primary current signal;
B, to voltage capacitance in bus PT secondary voltage, capacitance type potential transformer secondary voltage, capacitance type potential transformer Electric current, middle voltage capacitance current signal carry out Fourier analysis, obtain the amplitude, frequency and phase of above-mentioned signal, wherein bus PT The phase angle of secondary voltage fundametal compoment is defined asAmplitude is defined as Uz1, capacitance type potential transformer secondary voltage fundamental wave The phase angle of component is defined asAmplitude is defined as Uz2, the phase angle of voltage capacitance current first harmonics component is fixed in voltage transformer Justice isAmplitude is defined as Ic2, capacitance type potential transformer intermediate transformer primary current fundametal compoment phase angle definition ForAmplitude is defined as Ib
C, the vector of voltage transformer high-voltage capacitance voltage, high-voltage capacitance electric current, middle voltage capacitance voltage is calculated according to formula 1Obtain the amplitude, frequency and phase of above-mentioned signal, wherein the base of voltage transformer high-voltage capacitance voltage Wave phase angle is defined asAmplitude is defined as Uc1, the fundamental phase angle of high-voltage capacitance electric current is defined asAmplitude is defined as The fundamental phase of Ic1, middle voltage capacitance voltage are defined asAmplitude is defined as Uc2, the formula 1 specifically:
Wherein, L is capacitance type potential transformer compensation reactor inductance value, K1For the practical no-load voltage ratio of bus PT, K2For condenser type The practical no-load voltage ratio of voltage transformer intermediate transformer;
D, voltage transformer dielectric loss value tan δ is calculated according to formula 2xAnd capacitance Cx, formula 2 specifically:
Wherein, it when x=1, calculates and obtains capacitance type potential transformer high-voltage capacitance dielectric loss value tan δ1It is mutual with capacitor voltage Sensor high-voltage electricity capacity C1;When x=2, calculates and obtain voltage capacitance dielectric loss value tan δ in capacitance type potential transformer2And capacitive battery Press piezoelectricity capacity C in mutual inductor2
E, capacitance type potential transformer dielectric loss and capacitance are sent to local server by interchanger.
Particularly, the step B are as follows: to bus PT secondary voltage, capacitance type potential transformer secondary voltage, capacitive battery Press piezoelectricity capacitance current in mutual inductor, middle voltage capacitance current signal to carry out Fourier analysis, obtain the amplitude of above-mentioned signal, frequency and Phase, wherein the phase angle of bus PT secondary voltage fundametal compoment is defined asAmplitude is defined as Uz1, capacitor voltage The phase angle of mutual inductor secondary voltage fundametal compoment is defined asAmplitude is defined as Uz2, voltage capacitance electricity in voltage transformer The phase angle of stream fundametal compoment is defined asAmplitude is defined as Ic2, capacitance type potential transformer intermediate transformer primary current The phase angle of fundametal compoment is defined asAmplitude is defined as Ib, according to formula 3 to the phase of bus PT secondary voltage fundametal compoment Position is modified, and obtains the phase angle of revised bus PT secondary voltage fundametal compomentAccording to formula 4 to capacitive battery The phase of pressure mutual inductor secondary voltage fundametal compoment is modified, and obtains revised capacitance type potential transformer secondary voltage base The phase angle of wave componentFormula 3, formula 4 specifically:
Wherein,For the phase error of bus PT period regulation, can by carrying out error testing acquisition to bus PT,For the phase error of voltage transformer period regulation to be measured, can be obtained by carrying out error testing to voltage transformer to be measured ?.
Particularly, the capacitance type potential transformer dielectric loss and capacitance on-line monitoring method further include step F,
F, meteorological data is sent to local server by interchanger by weather station.
At capacitance type potential transformer dielectric loss and capacitance on-line monitoring system, including voltage/current monitoring device, data Manage device, clock synchronization apparatus, interchanger and local server, wherein
The voltage/current monitoring device is electrically connected with bus PT and capacitance type potential transformer, for obtaining bus PT Secondary voltage signal, current signal and capacitance type potential transformer secondary voltage signal, current signal, and send it to Data processing equipment;
The data processing equipment is connect with voltage/current monitoring device optical fiber, for sending out voltage/current monitoring device Voltage, the current signal sent is analyzed, is calculated, and capacitance type potential transformer dielectric loss and capacitance are obtained;
The clock synchronization apparatus is connect with voltage/current monitoring device and data processing equipment optical fiber, for for voltage/ Current monitoring device and data processing equipment provide synchronised clock;
The local server connects data processing equipment by interchanger, while passing through the external remote server of network, For the capacitance type potential transformer dielectric loss of monitoring and capacitance information to be sent to remote server.
Particularly, the voltage/current monitoring device includes voltage acquisition module, current acquisition module, signal processing mould Block, A/D conversion module, CPU and I/O interface module.
Particularly, the voltage acquisition module uses 0.01 grade of noninductive platinum resistance of high-precision.
Particularly, the current acquisition module uses 0.02 grade of passive zero flux current transformer, and current transformer uses The mode of punching multiturn.
Particularly, it is communicated between the local server and interchanger using IEC61850-9-2LE agreement.
Particularly, the capacitance type potential transformer dielectric loss and capacitance on-line monitoring system further include weather station, described Weather station with exchange mechatronics.
Compared with prior art, the present invention having the following advantages and benefits:
Capacitance type potential transformer dielectric loss of the present invention and capacitance on-line monitoring method and monitoring system, can be realized Automatic on-line monitoring to capacitance type potential transformer high-voltage capacitance and middle voltage capacitance dielectric loss and capacitance, explicit physical meaning, Measurement result is accurate, avoids dismounting lead of capacitance type potential transformer high pressure, reduces the workload of in-site measurement, and All test jobs can be carried out in the case where not having a power failure, and not influence electric system normal power supply.Meanwhile field erected gas As the environment parameter that can be monitored including temperature of standing, for research capacitance type potential transformer dielectric loss and capacitance and environment ginseng Changing rule provides important references between amount.Meanwhile using between local server and interchanger use IEC61850-9-2LE Protocol communication can support the smart machine of IEC61850-9-2LE agreement to realize the shared of information and hand over intelligent substation It changes.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the capacitance type potential transformer dielectric loss and capacitance on-line monitoring system circuit that the embodiment of the present invention 1 provides Structural block diagram.
Fig. 2 is the capacitance type potential transformer dielectric loss and capacitance on-line monitoring method process that the embodiment of the present invention 2 provides Figure.
Fig. 3 is the capacitance type potential transformer circuit diagram that the embodiment of the present invention 2 provides.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made For limitation of the invention.
Embodiment 1
The capacitance type potential transformer dielectric loss and capacitance provided as shown in FIG. 1, FIG. 1 is the embodiment of the present invention 1 is supervised online Examining system circuit structure block diagram.
At capacitance type potential transformer dielectric loss and capacitance on-line monitoring system, including voltage/current monitoring device, data Manage device, clock synchronization apparatus, interchanger and local server.
The voltage/current monitoring device is electrically connected with bus PT and voltage transformer, obtains the secondary voltage of bus PT Secondary voltage signal, the current signal of signal, current signal and capacitance type potential transformer, and send it to data processing dress It sets, specifically includes voltage acquisition module, current acquisition module, signal processing module, A/D conversion module, CPU and I/O interface mould Block.The voltage acquisition module uses 0.01 grade of noninductive platinum resistance of high-precision, acquires bus PT secondary voltage Uz1And capacitive battery Noninductive platinum resistance in parallel is divided each phase of pressure mutual inductor secondary voltage, bus PT and capacitance type potential transformer respectively, All noninductive platinum resistance have identical temperature coefficient, and concussion is small, and stability is good, therefore the voltage acquisition module is not become by temperature The influence of change, accuracy of measurement are high.The current acquisition module uses 0.02 grade of passive zero flux current transformer, acquires capacitor Piezoelectricity capacitance current, capacitance type potential transformer intermediate transformer primary current in formula voltage transformer, current transformer are used and are worn The mode of heart multiturn improves induction current intensity, and using shielding shell and shielded cable, therefore the current acquisition module is anti-dry It is strong to disturb ability, high safety and reliability, accuracy of measurement height.The present embodiment uses above-mentioned voltage acquisition module and current acquisition mould Block can obtain more accurate voltage, current values, to guarantee that the voltage according to acquisition, current value calculate the electricity obtained It presses mutual inductor dielectric loss and capacitance value accurate, and then guarantees that the monitoring device measurement result is accurate, can in time, accurately send out Existing failure.The signal processing module is electrically connected with voltage acquisition module and current acquisition module, by collected voltage, electric current Signal condition at A/D conversion module can received level range, be sent to A/D conversion module, while playing isolation and protection Effect.The A/D conversion module is electrically connected with signal processing module, and the analog signal that signal processing module is sent is converted into Digital signal is sent to CPU.The CPU is electrically connected with A/D conversion module, and digital signal is packaged into the report for meeting state net FT3 Digital electric signal is converted into optical signal by I/O interface module, which is sent to data processing equipment by text.
The data processing equipment is connect with voltage/current monitoring device optical fiber, is sent to voltage/current monitoring device Voltage, current signal are analyzed, are calculated, and voltage transformer dielectric loss and capacitance are obtained, and specifically use CPU.
The clock synchronization apparatus is connect with voltage/current monitoring device and data processing equipment optical fiber, is voltage/current Monitoring device and data processing equipment provide synchronised clock, it is ensured that data processing equipment and current-voltage monitoring device processing Data are the parameter under synchronization, specifically use FPGA.
The local server connects data processing equipment by interchanger, and monitoring information is uploaded to local server, Server can be uploaded to user by network simultaneously, and user further passes through interactive interface and remotely monitors capacitance type potential transformer Operation data.The monitoring information includes: bus PT secondary voltage, capacitance type potential transformer secondary voltage, capacitive battery Press piezoelectricity capacitance current, capacitance type potential transformer intermediate transformer primary current, capacitance type potential transformer high pressure in mutual inductor Capacitance voltage, high-voltage capacitance electric current and middle voltage capacitance voltage, capacitance type potential transformer high-voltage capacitance dielectric loss value and capacitance, Middle voltage capacitance dielectric loss value and capacitance.
A kind of preferred embodiment of the present embodiment is that the capacitance type potential transformer dielectric loss and capacitance are monitored on-line System also further includes weather station, the weather station with exchange mechatronics, real time monitoring stand in temperature, humidity, wind speed, rainfall and The meteorological datas such as illuminance, and it is uploaded to local server by interchanger, so that server can further be studied not With capacitance type potential transformer dielectric loss under meteorological condition and electric capacitance change rule.
The capacitance type potential transformer dielectric loss and capacitance on-line monitoring system use digital transformer substation typical architecture, The data format communicated between local server and interchanger uses IEC61850-9-2LE agreement, can be with intelligent substation branch The smart machine for holding IEC61850-9-2LE agreement realizes the shared and exchange of information.
Embodiment 2
Present embodiment discloses capacitance type potential transformer dielectric loss and capacitance on-line monitoring methods.
Fig. 2 is the capacitance type potential transformer dielectric loss and capacitance on-line monitoring method process that the embodiment of the present invention 2 provides Figure.
The method of on-line monitoring capacitance type potential transformer dielectric loss and capacitance specifically comprises the following steps:
S101, it monitoring bus PT secondary voltage, capacitance type potential transformer secondary voltage, presses in capacitance type potential transformer Capacitance current, capacitance type potential transformer intermediate transformer primary current.
As shown in figure 3, Fig. 3 is the capacitance type potential transformer circuit diagram that the embodiment of the present invention 2 provides.
Wherein, C1For capacitance type potential transformer high-voltage capacitance, C2For voltage capacitance in capacitance type potential transformer, T1 is same Phase bus PT, T2 are capacitance type potential transformer intermediate transformer, and L is capacitance type potential transformer compensation reactor.Voltage/electricity Flow monitoring device voltage acquisition module acquisition bus PT secondary voltage and capacitance type potential transformer secondary voltage, capacitive battery Piezoelectricity capacitance current and capacitance type potential transformer intermediate transformer primary current signal in mutual inductor are pressed, and by collected simulation Amount signal is converted into digital quantity signal, is transferred to data processing equipment by optical fiber with FT3 format.Wherein, using voltage acquisition Module, specifically using 0.01 grade of noninductive platinum resistance of high-precision to bus PT secondary voltage and the secondary electricity of capacitance type potential transformer Pressure is acquired, and all noninductive platinum resistance have identical temperature coefficient, and concussion is small, and stability is good, therefore the voltage acquisition mould The voltage value of block acquisition is stable, accurate;Using current acquisition module, 0.02 grade of passive zero flux Current Mutual Inductance is specifically used Device is acquired piezoelectricity capacitance current in capacitance type potential transformer and capacitance type potential transformer intermediate transformer primary current, The current transformer improves induction current intensity by the way of punching multiturn, and using shielding shell and shielded cable, resists Interference performance is strong, high safety and reliability, and accuracy of measurement is high, therefore the current values of current acquisition module acquisition are stable, quasi- Really.Meanwhile voltage, the current signal that A/D conversion module acquires voltage acquisition module and current acquisition module have carried out on the spot Digital processing is transmitted to data processing equipment after analog signals are converted to digital quantity signal, avoids analog signals and exists It is influenced in transmission process by electromagnetic interference, further improves the measurement accuracy of whole device.
S102, to piezoelectricity in bus PT secondary voltage, capacitance type potential transformer secondary voltage, capacitance type potential transformer Capacitance current, middle voltage capacitance current signal carry out Fourier analysis, obtain the amplitude, frequency and phase of above-mentioned signal.
Data processing equipment is to voltage capacitance electricity in bus PT secondary voltage, voltage transformer secondary voltage, voltage transformer Stream, voltage transformer intermediate transformer primary current signal carry out Fourier analysis, obtain the amplitude, frequency and phase of above-mentioned signal Position.Wherein, the phase angle of bus PT secondary voltage fundametal compoment is defined asAmplitude is defined as Uz1, capacitor voltage mutual inductance The phase angle of device secondary voltage fundametal compoment is defined asAmplitude is defined as Uz2, voltage capacitance current first harmonics in voltage transformer The phase angle of component is defined asAmplitude is defined as Ic2, capacitance type potential transformer intermediate transformer primary current fundamental wave point The phase angle of amount is defined asAmplitude is defined as Ib.Fourier analysis algorithm must not be by signal frequency compared with traditional FFT The restriction of frequency resolution integral multiple has good spectrum analysis characteristic, can effectively inhibit spectral leakage;In energy Within the scope of heart multiline, the phase invariance with signal first phase can significantly improve phase-measurement accuracy, and then improve whole device Measurement accuracy.
S103, voltage transformer high-voltage capacitance voltage, high-voltage capacitance electric current, middle voltage capacitance voltage are calculated according to formula 1 VectorObtain the amplitude, frequency and phase of above-mentioned signal.
Capacitance type potential transformer circuit diagram according to Fig.3, obtains formula 1, formula 1 specifically:
Data processing equipment calculates voltage transformer high-voltage capacitance voltage, high-voltage capacitance electric current, middle voltage capacitance according to formula 1 The vector of voltageWherein,For bus PT secondary voltage vector,For capacitor voltage mutual inductance The vector of device secondary voltage,For the vector of piezoelectricity capacitance current in voltage transformer,For voltage transformer intermediate transformer The vector of primary current, L are voltage transformer compensation reactor inductance value, K1For the practical no-load voltage ratio of bus PT, K2For voltage transformer The practical no-load voltage ratio of intermediate transformer, It is calculated and is obtained by step S102, L, K1、K2It can be tried by factory Test amount, L are measured when voltage transformer dispatches from the factory by Full automatic capacitance electric inductance measuring-testing instrument, K1、K2Respectively in bus PT and voltage It is measured when mutual inductor dispatches from the factory by the comprehensive transformer testing instrument of mutual inductor volt-ampere no-load voltage ratio.According to voltage transformer high-voltage capacitance electricity Pressure, high-voltage capacitance electric current, middle voltage capacitance voltage vectorObtain the amplitude, frequency and phase of above-mentioned signal Position.Wherein, the fundamental phase angle of voltage transformer high-voltage capacitance voltage is defined asAmplitude is defined as Uc1, high-voltage capacitance electricity The fundamental phase angle of stream is defined asAmplitude is defined as Ic1, and the fundamental phase of middle voltage capacitance voltage is defined asAmplitude is fixed Justice is Uc2
S104, capacitance type potential transformer capacitor dielectric loss value tan δ is calculated according to formula 2xAnd capacitance Cx
Data processing equipment calculates capacitance type potential transformer capacitor dielectric loss value tan δ according to formula 2xAnd capacitance Cx, public Formula 2 specifically:
When x value is 1, voltage transformer high-voltage capacitance dielectric loss value tan δ is obtainedx1With voltage transformer high-voltage electricity capacity C1,When x value is 2, obtain in voltage transformer Voltage capacitance dielectric loss value tan δx2With piezoelectricity capacity C in voltage transformer2,Wherein,To flow through voltage transformer high-voltage capacitance Current first harmonics component phase angle,For flow through voltage capacitance in voltage transformer current first harmonics component phase angle,For the phase angle of voltage transformer high-voltage capacitance end voltage fundamental component,For voltage capacitance end voltage in voltage transformer The phase angle of fundametal compoment, Uc1For voltage transformer high-voltage capacitance voltage fundamental component amplitude, Uc2For piezoelectricity in voltage transformer Hold voltage fundamental component amplitude, Ic1 is voltage transformer high-voltage capacitance current first harmonics component amplitude, and Ic2 is in voltage transformer Voltage capacitance current first harmonics component amplitude.Wherein,Ic1、Uc1、Uc2It is calculated and is obtained by step S103, Ic2It is calculated and is obtained by step S102.
S105, capacitance type potential transformer dielectric loss value and capacitance are sent to local server by interchanger.
Data processing equipment passes through interchanger for capacitance type potential transformer high-voltage capacitance dielectric loss value tan δ1And capacitance C1、 Voltage capacitance dielectric loss value tan δ in capacitance type potential transformer2And capacitance C2Equal monitoring informations are uploaded to local server, take simultaneously Business device can be uploaded to user by network, and user further passes through the operation that interactive interface remotely monitors capacitance type potential transformer Data.The monitoring information can also include bus PT secondary voltage Uz1, capacitance type potential transformer secondary voltage Uz2, capacitor Piezoelectricity capacitance current Ic2, capacitance type potential transformer intermediate transformer primary current I in formula voltage transformerb
The present embodiment, which obtains voltage transformer high-voltage capacitance and low-voltage capacitance dielectric loss and capacitance, only needs monitoring bus PT bis- Secondary voltage Uz1, voltage transformer secondary voltage Uz2, piezoelectricity capacitance current Ic2, voltage transformer intermediate transformer in voltage transformer Primary current Ib, do not need to be monitored capacitance type potential transformer primary voltage, electric current, so as to avoid dismounting high pressure one Secondary lead reduces the workload of in-site measurement, and all test jobs can be carried out in the case where not having a power failure, and not influence Electric system normal power supply.
High-voltage capacitance and middle voltage capacitance are considered as an equivalent series to the monitoring of capacitance type potential transformer by the prior art Capacitor calculates the dielectric loss and capacitance of the equivalent series capacitance device, and this method is only capable of judging that voltage transformer dielectric loss is excessive, hair Raw failure, but can not know the excessive capacitor of specific dielectric loss, physical significance is indefinite.Simultaneously as intermediate transformer is deposited The electric current of high-voltage capacitance and middle voltage capacitance and unequal is being flowed through, only with an electric current as a reference to evaluation capacitor dielectric loss is Inaccuracy.The present embodiment carries out the high-voltage capacitance of capacitance type potential transformer and the dielectric loss of low-voltage capacitance and capacitance respectively It calculates, explicit physical meaning, it is accurate to calculate, and the excessive capacitor of specific dielectric loss is known, to realize to capacitor voltage mutual inductance The abort situation of device carries out accurate judgement and positioning.
Since there are phase differences for first and second voltage of bus PT itself, a kind of preferred embodiment of the present embodiment is described In step S102, Fourier analysis is carried out to bus PT secondary voltage, capacitance type potential transformer secondary voltage, obtains above-mentioned letter Number its phase after, be further modified according to phase of the formula 3 to bus PT secondary voltage fundametal compoment, after being corrected Bus PT secondary voltage fundametal compoment phase angleAccording to formula 4 to capacitance type potential transformer secondary voltage fundamental wave The phase of component is modified, and obtains the phase angle of revised capacitance type potential transformer secondary voltage fundametal compoment Formula 3, formula 4 specifically:
Wherein,For the phase error of bus PT period regulation, can by carrying out error testing acquisition to bus PT,
Wherein,It, can be by carrying out error testing acquisition to bus PT for the phase error of bus PT period regulation;For the phase error of voltage transformer period regulation to be measured, can be obtained by carrying out error testing to voltage transformer to be measured ?;For the phase angle of bus PT secondary voltage fundametal compoment,For capacitance type potential transformer secondary voltage fundamental wave The phase angle of component can be obtained by step S102.The phase angle of revised bus PT secondary voltage fundametal compoment And the phase angle of revised capacitance type potential transformer secondary voltage fundametal compomentSubstitute into step S103, S104 in into Row calculates in next step.
A kind of preferred embodiment of the present embodiment is the on-line monitoring capacitance type potential transformer dielectric loss and capacitance Method further include step S106,
S106, meteorological data is sent to local server by interchanger.
The meteorological datas such as temperature, humidity, wind speed, rainfall and illuminance in weather station real time monitoring station, and passed through friendship It changes planes and is uploaded to local server, be situated between so that server can further study capacitance type potential transformer under DIFFERENT METEOROLOGICAL CONDITIONS Damage and electric capacitance change rule.
It should be noted that for data processing equipment and current-voltage monitoring device to provide clock same for clock synchronization apparatus Walk signal, it is ensured that the data of the two processing are the parameter under synchronization, and synchronous error is less than 0.1us.
It is mutual to obtain bus PT secondary voltage, capacitor voltage by voltage/current monitoring device for technical solution of the present invention Piezoelectricity capacitance current, capacitance type potential transformer intermediate transformer primary current in sensor secondary voltage, capacitance type potential transformer, And the data of acquisition are sent to data processing equipment and are calculated, acquisition capacitance type potential transformer high-voltage capacitance dielectric loss value, Voltage capacitance dielectric loss value in capacitance type potential transformer high-voltage electricity capacity, capacitance type potential transformer, in capacitance type potential transformer Piezoelectricity capacity monitors the automatic on-line of capacitance type potential transformer dielectric loss and capacitance to realize, measurement result is accurate, has Accurate judgement and positioning are carried out conducive to the abort situation to capacitance type potential transformer.Meanwhile avoiding dismounting capacitor voltage Lead of mutual inductor high pressure, reduces the workload of in-site measurement, and all test jobs can be in the case where not having a power failure Carry out, does not influence electric system normal power supply.On-line monitoring system uses digital transformer substation typical architecture, and data format uses IEC61850-9-2LE agreement can support the smart machine of IEC61850-9-2LE agreement to realize information with intelligent substation Shared and exchange, has good popularization and application foreground.Meanwhile field erected weather station can monitor including temperature Environment parameter, changing rule provides important ginseng between research capacitance type potential transformer dielectric loss and capacitance and environment parameter It examines.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include Within protection scope of the present invention.

Claims (9)

1. capacitance type potential transformer dielectric loss and capacitance on-line monitoring method, characterized in that it comprises the following steps:
A, bus PT secondary voltage, capacitance type potential transformer secondary voltage, voltage capacitance electricity in capacitance type potential transformer are monitored Stream, capacitance type potential transformer intermediate transformer primary current signal;
B, to piezoelectricity capacitance current in bus PT secondary voltage, capacitance type potential transformer secondary voltage, capacitance type potential transformer, Capacitance type potential transformer intermediate transformer primary current signal carries out Fourier analysis, obtains amplitude, the frequency of above-mentioned signal And phase, wherein the phase angle of bus PT secondary voltage fundametal compoment is defined asAmplitude is defined as Uz1, capacitor voltage The phase angle of mutual inductor secondary voltage fundametal compoment is defined asAmplitude is defined as Uz2, piezoelectricity in capacitance type potential transformer The phase angle of capacitance current fundametal compoment is defined asAmplitude is defined as Ic2, capacitance type potential transformer intermediate transformer it is primary The phase angle of current first harmonics component is defined asAmplitude is defined as Ib
C, capacitance type potential transformer high-voltage capacitance voltage, high-voltage capacitance electric current, middle voltage capacitance voltage are calculated according to formula (1) VectorObtain the amplitude, frequency and phase of above-mentioned signal, wherein capacitance type potential transformer high-voltage electricity The fundamental phase angle for holding voltage is defined asAmplitude is defined as Uc1, the fundamental phase angle of high-voltage capacitance electric current is defined as Amplitude is defined as Ic1, and the fundamental phase of middle voltage capacitance voltage is defined asAmplitude is defined as Uc2, the formula (1) is specifically Are as follows:
Wherein, L is capacitance type potential transformer compensation reactor inductance value, K1For the practical no-load voltage ratio of bus PT, K2For capacitor voltage The practical no-load voltage ratio of mutual inductor intermediate transformer;
D, capacitance type potential transformer dielectric loss value tan δ is calculated according to formula (2)xAnd capacitance Cx, formula (2) specifically:
Wherein, it when x=1, calculates and obtains capacitance type potential transformer high-voltage capacitance dielectric loss value tan δ1And capacitance type potential transformer High-voltage electricity capacity C1;When x=2, calculates and obtain voltage capacitance dielectric loss value tan δ in capacitance type potential transformer2It is mutual with capacitor voltage Piezoelectricity capacity C in sensor2
E, capacitance type potential transformer dielectric loss and capacitance are sent to local server by interchanger.
2. capacitance type potential transformer dielectric loss as described in claim 1 and capacitance on-line monitoring method, which is characterized in that institute State step B are as follows: to voltage capacitance in bus PT secondary voltage, capacitance type potential transformer secondary voltage, capacitance type potential transformer Electric current, capacitance type potential transformer intermediate transformer primary current signal carry out Fourier analysis, obtain above-mentioned signal amplitude, Frequency and phase, wherein the phase angle of bus PT secondary voltage fundametal compoment is defined asAmplitude is defined as Uz1, capacitor The phase angle of formula voltage transformer secondary voltage fundamental component is defined asAmplitude is defined as Uz2, capacitor voltage mutual inductance The phase angle of voltage capacitance current first harmonics component is defined as in deviceAmplitude is defined as Ic2, become among capacitance type potential transformer The phase angle of depressor primary current fundametal compoment is defined asAmplitude is defined as Ib, according to formula (3) to bis- electricity of bus PT The phase of pressure fundametal compoment is modified, and obtains the phase angle of revised bus PT secondary voltage fundametal compomentAccording to Formula (4) is modified the phase of capacitance type potential transformer secondary voltage fundametal compoment, obtains revised capacitive battery Press the phase angle of mutual inductor secondary voltage fundametal compomentFormula (3), formula (4) specifically:
Wherein,For the phase error of bus PT period regulation, by carrying out error testing acquisition to bus PT,For to The phase error of capacitance type potential transformer period regulation is surveyed, it can be by carrying out error survey to capacitance type potential transformer to be measured Examination obtains.
3. capacitance type potential transformer dielectric loss as claimed in claim 1 or 2 and capacitance on-line monitoring method, feature exist In, it further include step F,
F, meteorological data is sent to local server by interchanger by weather station.
4. realize as described in claims 1 to 3 is any capacitance type potential transformer dielectric loss and capacitance on-line monitoring method System, which is characterized in that including voltage/current monitoring device, data processing equipment, clock synchronization apparatus, interchanger and local Server, wherein
The voltage/current monitoring device is electrically connected with bus PT, for obtaining the secondary voltage signal of bus PT;The electricity Pressure/current monitoring device is electrically connected with capacitance type potential transformer, for obtaining secondary voltage, the electricity of capacitance type potential transformer The intermediate transformer primary current signal of the middle piezoelectricity capacitance current of appearance formula voltage transformer, capacitance type potential transformer, and by its It is sent to data processing equipment;
The data processing equipment is connect with voltage/current monitoring device optical fiber, for what is sent to voltage/current monitoring device Voltage, current signal are analyzed, are calculated, and capacitance type potential transformer dielectric loss and capacitance are obtained;
The clock synchronization apparatus is connect with voltage/current monitoring device and data processing equipment optical fiber, for being voltage/current Monitoring device and data processing equipment provide synchronised clock;
The local server connects data processing equipment by interchanger, while by the external remote server of network, being used for The capacitance type potential transformer dielectric loss of monitoring and capacitance information are sent to remote server.
5. capacitance type potential transformer dielectric loss as claimed in claim 4 and capacitance on-line monitoring system, which is characterized in that institute Stating voltage/current monitoring device includes voltage acquisition module, current acquisition module, signal processing module, A/D conversion module, CPU With I/O interface module.
6. capacitance type potential transformer dielectric loss as claimed in claim 4 and capacitance on-line monitoring system, which is characterized in that institute Voltage acquisition module is stated using 0.01 grade of noninductive platinum resistance of high-precision.
7. capacitance type potential transformer dielectric loss as claimed in claim 4 and capacitance on-line monitoring system, which is characterized in that institute Current acquisition module is stated using 0.02 grade of passive zero flux current transformer, current transformer is by the way of punching multiturn.
8. capacitance type potential transformer dielectric loss as claimed in claim 4 and capacitance on-line monitoring system, which is characterized in that institute It states and is communicated between local server and interchanger using IEC61850-9-2LE agreement.
9. capacitance type potential transformer dielectric loss and capacitance on-line monitoring system as described in claim 4 to 8 is any, feature Be, further include weather station, the weather station with exchange mechatronics.
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