CN106093593B  Condenser type electric power equipment dielectric loss online test method and system  Google Patents
Condenser type electric power equipment dielectric loss online test method and system Download PDFInfo
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 CN106093593B CN106093593B CN201610640088.2A CN201610640088A CN106093593B CN 106093593 B CN106093593 B CN 106093593B CN 201610640088 A CN201610640088 A CN 201610640088A CN 106093593 B CN106093593 B CN 106093593B
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Classifications

 G—PHYSICS
 G01—MEASURING; TESTING
 G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
 G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
 G01R27/02—Measuring real or complex resistance, reactance, impedance, or other twopole characteristics derived therefrom, e.g. time constant
 G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
 G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
 G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
Abstract
Description
Technical field
The present invention relates to power equipment testing fields, examine online more particularly to a kind of condenser type electric power equipment dielectric loss Survey method and system.
Background technique
Condenser type power equipment is the power equipment for showing as capacitor, such as casing, current transformer, capacitor voltage mutual inductance Device CVT etc., has a wide range of applications in the power system, and quantity accounts for about the 40%~50% of the total number of units of substation equipment.System Meter data shows that the main reason for leading to condenser type electrical equipment fault is insulation performance deterioration, and a master of insulation degradation Show is that dielectric loss rises.Dielectric loss tan δ is the characteristic parameter for reflecting insulation dielectric loss size, it is only dependent upon The dielectric property of insulating materials, it is unrelated with the size of medium.Experience have shown that it is whole exhausted to measure it for condenser type power equipment Edge dielectric dissipation factor can more delicately local defect expansionary in discovering device and apparatus insulated whole dampness and deterioration The defects of rotten, thus it is particularly significant for the insulation status for judging capacitance type equipment to measure tan δ.
It is traditional in the prior art, in order to avoid offline inspection needs to have a power failure and the problem of cannot continuously monitor, at present The method for generalling use dielectric loss online checking (online monitoring or live detection), i.e., the condition operated normally in power equipment Under, tan δ and capacitance C is lost in measuring medium, but existing method needs synchro measure, and there are the difficulties of accurate synchronization, also very It is easy to bring measurement error.
Therefore how under the premise of not changing original voltage and current online detection instrument and method, from asynchronous measurement In the voltage and current signal of (there are certain time differences), condenser type electric power equipment dielectric loss information is accurately obtained, for Judge that the insulation status of capacitance type equipment is of great significance.
Summary of the invention
Based on this, it is necessary to which, under voltage and current signal measurement out of step conditions, existing dielectric loss measurement method is surveyed The problem for measuring result inaccuracy provides a kind of condenser type electric power equipment dielectric loss online test method and system.
A kind of condenser type electric power equipment dielectric loss online test method, comprising the following steps:
Electric current and the condenser type power equipment busbar voltage on the ground line of online measurement condenser type power equipment Voltage on mutual inductor；
The coefficient of each harmonic component of the voltage and the electric current is obtained by Fourier analysis；
The voltage and the electric current are calculated according to the coefficient of the voltage and each harmonic component of the electric current The amplitude of each harmonic component；
According to the amplitude of the voltage and each harmonic component of the electric current, the equivalent electricity of condenser type power equipment is calculated Appearance and equivalent resistance；
Dielectric loss angle tangent and defeated is calculated according to the equivalent capacity of the condenser type power equipment and equivalent resistance Out.
A kind of condenser type electric power equipment dielectric loss online detecting system, comprising:
Current Voltage detection module, electric current and the capacitor on the ground line of online measurement condenser type power equipment Voltage on formula power equipment busbar potential transformer；
Analysis module obtains the coefficient of each harmonic component of the voltage and the electric current by Fourier analysis；
Harmonic component amplitude computing module is calculated according to the coefficient of the voltage and each harmonic component of the electric current The amplitude of each harmonic component of the voltage and the electric current；
Equivalent capacity and equivalent resistance computing module, according to the width of the voltage and each harmonic component of the electric current Value calculates the equivalent capacity and equivalent resistance of condenser type power equipment；
Dielectric loss angle tangent computing module is calculated according to the equivalent capacity of the condenser type power equipment and equivalent resistance It obtains dielectric loss angle tangent and exports.
Abovementioned condenser type electric power equipment dielectric loss online test method and system, based on power system voltage, there are harmonic waves Component, by being measured while the fundamental wave and harmonic wave of condenser type power equipment voltage and current, according to the width of each harmonic component The equivalent capacity and equivalent resistance of condenser type power equipment is calculated in value, haves no need to change original voltage measurement and current measurement Equipment and means, implement simple, securely and reliably, do not need the medium that condenser type equipment can also be accurately calculated in accurate synchronization Loss, avoids the difficulty of voltage and current synchro measure, also ensures that medium in the case where voltage and current signal measures out of step conditions The accuracy of measurement of loss.
Detailed description of the invention
Fig. 1 is the flow chart of condenser type electric power equipment dielectric loss online test method in an embodiment；
Fig. 2 is the equivalent circuit diagram of condenser type power equipment；
Fig. 3 is the phasor diagram of voltage and current in condenser type power equipment；
Fig. 4 is the time domain waveform of voltage and current in condenser type power equipment；
Fig. 5 is the structure chart of condenser type electric power equipment dielectric loss online detecting system in an embodiment.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing Give preferred embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein Described embodiment.On the contrary, purpose of providing these embodiments is keeps the understanding to the disclosure more saturating It is thorough comprehensive.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " or/and " it include one or more phases Any and all combinations of the listed item of pass.
A kind of condenser type electric power equipment dielectric loss online test method, as shown in Figure 1, comprising the following steps:
Step S110: the electric current and condenser type power equipment on the ground line of online measurement condenser type power equipment are female Voltage on line voltage mutual inductor.
Condenser type power equipment is the power equipment for showing as capacitor, such as casing, current transformer, capacitor voltage mutual inductance Device CVT etc., has a wide range of applications in the power system, and quantity accounts for about the 40%~50% of the total number of units of substation equipment.? It is usually that electric current is used on the ground line of condenser type power equipment that line, which measures the electric current on the ground line of condenser type power equipment, Mutual inductor measures, and the voltage on online measurement condenser type power equipment busbar potential transformer is usually the mother in substation It is measured on line voltage mutual inductor.
Step S120: the coefficient of each harmonic component of voltage and current is obtained by Fourier analysis.
The electric current and condenser type power equipment bus on the ground line of condenser type power equipment are obtained by step S110 After voltage on voltage transformer, the coefficient for obtaining each harmonic component of voltage and current is calculated by Fourier space.
Specifically, in one embodiment, step S120 includes step 122 and step 124.
Step 122: the coefficient of each harmonic component of voltage is obtained by Fourier analysis.Specifically:
Step 124: the coefficient of each harmonic component of electric current is obtained by Fourier analysis.Specifically:
Wherein, N is one periodic sampling of time domain periodic signal points, and I (k) and U (k) are the sampling of current or voltage kth time Value, n is odd number, a_{n}、b_{n}The respectively cosine coefficient and sinusoidal coefficients of the nth harmonic of voltage, a_{n}'、b_{n}' be respectively electric current n times The cosine coefficient and sinusoidal coefficients of harmonic wave.
Step S130: each harmonic of voltage and current is calculated according to the coefficient of each harmonic component of voltage and current The amplitude of component.
It, can basis after obtaining the coefficient of each harmonic component of voltage and current according to Fourier algorithm principle Respective formula calculates the amplitude of each harmonic component of voltage and current.
Specifically, in one embodiment, step S130 includes step 132 and step 134.
Step 132: calculating the amplitude of each harmonic component of voltage according to the coefficient of each harmonic component of voltage, have Body are as follows:
Step 134: calculating the amplitude of each harmonic component of electric current according to the coefficient of each harmonic component of electric current, have Body are as follows:
Wherein, U_{n}For the amplitude of each harmonic component of voltage, I_{n}For the amplitude of each harmonic component of electric current.
Step S140: according to the amplitude of each harmonic component of voltage and current, the equivalent of condenser type power equipment is calculated Capacitor and equivalent resistance.
As shown in Fig. 2, being the equivalent circuit diagram of condenser type power equipment, wherein C is that condenser type power equipment externally shows Equivalent capacity out, R are equivalent resistance,For the end voltage being applied on condenser type power equipment,To flow through condenser type electric power The total current of equipment,For the capacity current for flowing through capacitor,For the current in resistance property for flowing through resistance.
The amplitude of the equivalent circuit of condenser type equipment according to Fig.2, fundamental wave and each harmonic should meet:
Specifically:
Wherein, U_{n}For the amplitude of each harmonic component of voltage, I_{n}For the amplitude of each harmonic component of electric current, w_{n}For n times The angular frequency of harmonic wave, n are odd number, and R is equivalent resistance, and C is equivalent capacity.
When n takes different value, any two (equation of such as fundamental wave and triplefrequency harmonics) in these equations of simultaneous, Ji Keqiu Obtain the value of the equivalent resistance R and equivalent capacity C of condenser type power equipment.
Step S150: dielectric loss angle tangent is calculated according to the equivalent capacity of condenser type power equipment and equivalent resistance And it exports.
As shown in figure 3, for the phasor diagram of voltage and current in condenser type power equipment.As shown in figure 4, being condenser type electric power The time domain waveform of voltage and current in equipment.Wherein, C is the equivalent capacity that externally shows of condenser type power equipment, and R is etc. Resistance is imitated,For the end voltage being applied on condenser type power equipment,For the total current for flowing through condenser type power equipment,For The capacity current of capacitor is flowed through,For the current in resistance property for flowing through resistance,For powerfactor angle, δ is dielectric loss angle.
According to Kirchhoff's law, should meet between each phasor:
Powerfactor angleIt should meet therebetween with dielectric loss angle δDielectric loss angle tangent tan δ's Calculation method are as follows:
Specifically:
Wherein, δ is dielectric loss angle, w_{n}For the angular frequency of nth harmonic, n is odd number, and R is equivalent resistance, and C is equivalent electricity Hold.
So far, that is, the online checking of the dielectric loss under condenser type power equipment normal running (operation) conditions is completed.It exports To dielectric loss angle tangent, it specifically can be output and shown to display, be also possible to output to memory and stored.
Abovementioned condenser type electric power equipment dielectric loss online test method, based on power system voltage there are harmonic component, By being measured while the fundamental wave and harmonic wave of condenser type power equipment voltage and current, calculated according to the amplitude of each harmonic component Obtain the equivalent capacity and equivalent resistance of condenser type power equipment, the equipment for having no need to change original voltage measurement and current measurement And means, implement simply, securely and reliably, not needing the dielectric loss that condenser type equipment can also be accurately calculated in accurate synchronization, The difficulty for avoiding voltage and current synchro measure also ensures that dielectric loss in the case where voltage and current signal measures out of step conditions Accuracy of measurement.
The present invention also provides a kind of condenser type electric power equipment dielectric loss online detecting systems, as shown in figure 5, including electricity Voltage detection module 110, analysis module 120, harmonic component amplitude computing module 130, equivalent capacity and equivalent resistance is flowed to calculate Module 140 and dielectric loss angle tangent computing module 150.
Electric current of the Current Voltage detection module 110 on the ground line of online measurement condenser type power equipment, Yi Ji electricity Voltage on appearance formula power equipment busbar potential transformer.
Analysis module 120 is used to obtain the coefficient of each harmonic component of voltage and current by Fourier analysis.At it In middle one embodiment, analysis module 120 includes voltage harmonic component calculation unit and current harmonics component calculation unit.
Specifically, voltage harmonic component calculation unit obtains the coefficient of voltage each harmonic component by Fourier analysis, Specifically:
Current harmonics component calculation unit obtains the coefficient of each harmonic component of electric current by Fourier analysis, specifically Are as follows:
Wherein, N is one periodic sampling of time domain periodic signal points, and I (k) and U (k) are the sampling of current or voltage kth time Value, n is odd number, a_{n}、b_{n}The respectively cosine coefficient and sinusoidal coefficients of the nth harmonic of voltage, a_{n}'、b_{n}' be respectively electric current n times The cosine coefficient and sinusoidal coefficients of harmonic wave.
Harmonic component amplitude computing module 130 is used to calculate electricity according to the coefficient of each harmonic component of voltage and current The amplitude of each harmonic component of pressure and electric current.Specifically, harmonic component amplitude computing module in one of the embodiments, 130 include that voltage harmonic component amplitude computing unit and harmonic component crest meter calculate unit.
Specifically, voltage harmonic component amplitude computing unit calculates voltage according to the coefficient of each harmonic component of voltage Each harmonic component amplitude, specifically:
Current harmonics component amplitude computing unit calculates each time of electric current according to the coefficient of each harmonic component of electric current The amplitude of harmonic component, specifically:
Wherein, U_{n}For the amplitude of each harmonic component of voltage, I_{n}For the amplitude of each harmonic component of electric current.
Equivalent capacity and equivalent resistance computing module 140 are used for the amplitude of each harmonic component according to voltage and current, Calculate the equivalent capacity and equivalent resistance of condenser type power equipment.In one of the embodiments, specifically:
Wherein, U_{n}For the amplitude of each harmonic component of voltage, I_{n}For the amplitude of each harmonic component of electric current, w_{n}For n times The angular frequency of harmonic wave, n are odd number, and R is equivalent resistance, and C is equivalent capacity.
When n takes different value, any two (equation of such as fundamental wave and triplefrequency harmonics) in these equations of simultaneous, Ji Keqiu Obtain the value of the equivalent resistance R and equivalent capacity C of condenser type power equipment.
Dielectric loss angle tangent computing module 150 is based on the equivalent capacity and equivalent resistance according to condenser type power equipment Calculation obtains dielectric loss angle tangent.In one of the embodiments, specifically:
Wherein, δ is dielectric loss angle, w_{n}For the angular frequency of nth harmonic, n is odd number, and R is equivalent resistance, and C is equivalent electricity Hold.
Abovementioned condenser type electric power equipment dielectric loss online detecting system, based on power system voltage there are harmonic component, By being measured while the fundamental wave and harmonic wave of condenser type power equipment voltage and current, calculated according to the amplitude of each harmonic component Obtain the equivalent capacity and equivalent resistance of condenser type power equipment, the equipment for having no need to change original voltage measurement and current measurement And means, implement simply, securely and reliably, not needing the dielectric loss that condenser type equipment can also be accurately calculated in accurate synchronization, The difficulty for avoiding voltage and current synchro measure also ensures that dielectric loss in the case where voltage and current signal measures out of step conditions Accuracy of measurement.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
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CN1580795A (en) *  20040517  20050216  西安交通大学  Capacitive power equipment medium loss online monitoring method and device 
CN102156250A (en) *  20110317  20110817  华北电力大学（保定）  Dielectric loss factor measurement method based on equivalent model 
CN104111381A (en) *  20140701  20141022  国家电网公司  Dielectric loss online monitoring device for 35kV high voltage parallel connection power capacitor group 

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CN1580795A (en) *  20040517  20050216  西安交通大学  Capacitive power equipment medium loss online monitoring method and device 
CN102156250A (en) *  20110317  20110817  华北电力大学（保定）  Dielectric loss factor measurement method based on equivalent model 
CN104111381A (en) *  20140701  20141022  国家电网公司  Dielectric loss online monitoring device for 35kV high voltage parallel connection power capacitor group 
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