CN103604991B - The busbar voltage phase measurement device of capacitance type potential transformer and method - Google Patents

The busbar voltage phase measurement device of capacitance type potential transformer and method Download PDF

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CN103604991B
CN103604991B CN201310603725.5A CN201310603725A CN103604991B CN 103604991 B CN103604991 B CN 103604991B CN 201310603725 A CN201310603725 A CN 201310603725A CN 103604991 B CN103604991 B CN 103604991B
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current
transformer
voltage
capacitance type
type potential
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CN103604991A (en
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廉彦超
陈彬
陈敏维
范元亮
吴勇昊
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State Grid Corp of China SGCC
Fujian Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
Fujian Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
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Abstract

The present invention relates to a kind of busbar voltage phase measurement device of capacitance type potential transformer and method, this device includes the first current transformer, the second current transformer and current vector collection computing unit, and the method comprises the following steps:First current transformer, the second current transformer are respectively connected to the earth terminal of middle voltage capacitance and the earth terminal of intermediate transformer of capacitance type potential transformer;The current signal that first current transformer, the second current transformer will be coupled into respectively sends into current vector collection computing unit, the current signal of collection is amplified, filters etc. processing, and be converted to digital signal, the instantaneous phase of the busbar voltage of capacitance type potential transformer is then obtained by numerical computations.This device and method not only measures accurately, and real-time is good, and wiring is simple, capacitance type potential transformer is affected little, safe and reliable.

Description

The busbar voltage phase measurement device of capacitance type potential transformer and method
Technical field
The present invention relates to electric power system power transformation equipment on-line monitoring technique field, particularly a kind of capacitance type potential transformer Busbar voltage phase measurement device and method.
Background technology
In the open type transformer station of existing 220kV and above, the voltage transformer overwhelming majority is condenser type Voltage transformer(CVT).In the prior art, the reference phase of capacitance type equipment and metal oxide arrester on-line monitoring system What position was chosen is CVT secondary side output voltage, and due to using the direct method gathering CVT secondary side voltage, this will be CVT secondary side voltage output end accesses voltage coupling devices, and its shortcoming is:The voltage coupling devices accessing can take certain CVT output capacity, the equipment of access can increase CVT secondary circuit short-circuit risk, and the error characteristics of CVT are not so good as electromagnetic type electricity Pressure transformer is stable, and the change of system frequency, CVT secondary load size and power factor all can introduce additive error.Particularly For the insulated on-line monitoring of electrical equipment, due to the restriction of systematic survey condition, voltage reference signal generally all takes from voltage Transformer, therefore, the quality of voltage transformer directly influences the working condition of secondary device.Although the precision of CVT can reach To 0.2 grade, but these additive errors still can bring considerable influence to insulated on-line monitoring.Sun Jiantao etc. delivers《Insulation is online The error correction of capacitance type potential transformer in monitoring》In propose a kind of improved method, the method is in each time of CVT secondary side All current transformer has been concatenated, this makes the method wiring in implementation process complicated, fitting function method used in literary composition in road Computationally intensive, real-time is poor, and computational accuracy is relevant with iterationses.Additionally, this fixed phase measuring method still needs Access voltage coupling devices in CVT secondary side, do not eliminate the operating potential risk of CVT.
Content of the invention
It is an object of the invention to provide a kind of busbar voltage phase measurement device of capacitance type potential transformer and method, This device and method not only measures accurately, and real-time is good, and wiring is simple, affects little, safety to capacitance type potential transformer Reliable.
For achieving the above object, the technical scheme is that:A kind of busbar voltage phase place of capacitance type potential transformer Measurement apparatus, including:
First current transformer(CT1), the middle voltage capacitance of described first current transformer access capacitance type potential transformer Earth terminal, for collection in voltage capacitance earth current;
Second current transformer(CT2), the middle transformation of described second current transformer access capacitance type potential transformer The earth terminal of device, for gathering intermediate transformer earth current;
Current vector gathers computing unit, described current vector collection computing unit and described first current transformer, the The outfan of two current transformers is connected, and is processed with the current signal to collection, and is converted to digital signal, Ran Houtong Cross the instantaneous phase that numerical computations obtain the busbar voltage of capacitance type potential transformer.
Further, described current vector collection computing unit includes signal processing circuit, analog-digital converter and numeral letter Number processor, described first current transformer, the second current transformer outfan respectively with signal processing circuit described in Input is connected, and the outfan of described two signal processing circuits is connected with the input of described analog-digital converter respectively, institute The outfan stating analog-digital converter is connected with the input of described digital signal processor.
The present invention also provides a kind of busbar voltage Method for Phase Difference Measurement of capacitance type potential transformer, comprises the following steps:
(1)First current transformer, the second current transformer are respectively connected to the middle voltage capacitance of capacitance type potential transformer Earth terminal and intermediate transformer earth terminal;
(2)The current signal that first current transformer, the second current transformer will be coupled into respectively sends into signal processing electricity Road, is amplified, filters etc. processing to the current signal of input;
(3)Current signal after processing is sent into analog-digital converter by signal processing circuit respectively, and current signal is changed For digital signal;
(4)The digital signal that analog-digital converter obtains sampling sends into digital signal processor, is obtained by numerical computations The instantaneous phase of the busbar voltage of capacitance type potential transformerθ
WhenWhen, the wink of described busbar voltage Shi XiangweiθFor:
WhenWhen, the wink of described busbar voltage Shi XiangweiθFor:
Wherein, K represents intrinsic standoff ratio, IcRepresent and flow through middle voltage capacitanceC 2Electric current, ILRepresent and flow through intermediate transformer primary side Electric current, j represents imaginary part, δ1、δ2Represent derided capacitors C respectively1、C2Dielectric loss angle, Re (), Im () represent respectively The real part of complex function and imaginary part.
Compared to prior art, the invention has the beneficial effects as follows only piezoelectricity in CVT is gathered by high precision current transformer Hold C2 earth current and intermediate transformer T1 earth current, in current vector collection computing unit, the current signal of collection is turned Turn to digital signal, and obtain the instantaneous phase of CVT busbar voltage by numerical computations, voltage coupling devices need not be accessed, no Only measure accurately, real-time is good, and wiring is simple, capacitance type potential transformer is affected little, safe and reliable, have very Strong practicality and wide application prospect.
Brief description
Fig. 1 is the access state schematic diagram of apparatus of the present invention.
Fig. 2 is the composition structural representation of apparatus of the present invention.
Fig. 3 is the voltage being carried in capacitance type potential transformer on each device two ends and flows through the phase place between electric current Relation vector figure.
In Fig. 1,C 1High-voltage capacitance,C 2Middle voltage capacitance,LCompensation reactor,TIntermediate transformer,R d Damping Device,und u d n Secondary Winding terminal and residual voltage winding terminals,C x Other capacitance type equipments on same bus,UBus Voltage,U 1High-voltage capacitanceC 1Both end voltage,U 2Middle voltage capacitanceC 2Both end voltage(Intermediate voltage terminal voltage-to-ground),I c Flow through middle voltage capacitanceC 2Electric current,I L Flow through intermediate transformer primary side current,IFlow through high-voltage capacitanceC 1Electric current,θBusbar voltageUReal-time phase angle.
Specific embodiment
The busbar voltage phase measurement device of capacitance type potential transformer of the present invention, as shown in figure 1, include:
First Current Transmit 1, described first Current Transmit 1 accesses the middle voltage capacitance of capacitance type potential transformer The earth terminal of C2, for voltage capacitance C2 earth current in collection;
Second Current Transmit 2, described second Current Transmit 2 accesses the middle transformation of capacitance type potential transformer The earth terminal of device T1, for gathering intermediate transformer T1 earth current;
Current vector gathers computing unit, described current vector collection computing unit and described first current transformer, the The outfan of two current transformers is connected, and is processed with the current signal to collection, and is converted to digital signal, Ran Houtong Cross the instantaneous phase that numerical computations obtain the busbar voltage of capacitance type potential transformer.
As shown in Fig. 2 described current vector collection computing unit includes signal processing circuit, analog-digital converter and numeral letter Number processor, described first current transformer, the second current transformer outfan respectively with signal processing circuit described in Input is connected, and the outfan of described two signal processing circuits is connected with the input of described analog-digital converter respectively, institute The outfan stating analog-digital converter is connected with the input of described digital signal processor.
The busbar voltage Method for Phase Difference Measurement of capacitance type potential transformer of the present invention, comprises the following steps:
(1)First current transformer, the second current transformer are respectively connected to the middle voltage capacitance of capacitance type potential transformer The earth terminal of C2 and the earth terminal of intermediate transformer T1;
(2)The current signal that first current transformer, the second current transformer will be coupled into respectively sends into signal processing electricity Road, is amplified, filters etc. processing to the current signal of input;
(3)Current signal after processing is sent into analog-digital converter by signal processing circuit respectively, and current signal is changed For digital signal;
(4)The digital signal that analog-digital converter obtains sampling sends into digital signal processor, is obtained by numerical computations The instantaneous phase of the busbar voltage of capacitance type potential transformerθ
WhenWhen, the wink of described busbar voltage Shi XiangweiθComplex representation form be:
WhenWhen, the wink of described busbar voltage Shi XiangweiθComplex representation form be:
Wherein, K represents intrinsic standoff ratio, IcRepresent and flow through middle voltage capacitanceC 2Electric current, ILRepresent and flow through intermediate transformer primary side Electric current, j represents imaginary part, δ1、δ2Represent derided capacitors C respectively1、C2Dielectric loss angle, Re (), Im () represent respectively The real part of complex function and imaginary part.
Below to the present invention relates to related content be further described.
As shown in figure 1, flowing through middle voltage capacitance using high precision current transformer measurementC 2Electric currentI c , flow through middle transformation Device primary side currentI L .ByI c I L With busbar voltageUBetween phase relation, by calculating the real-time phase of busbar voltage Position.The voltage that is carried in Fig. 1 on each device two ends and flow through phase relation between electric current as shown in vectorial Fig. 3.
Capacitance type potential transformer in normal work, voltage-dividing capacitorC 1Dielectric dissipation factor be tan δ1, partial pressure electricity ContainerC 2Dielectric dissipation factor be tan δ2.Intrinsic standoff ratio is, line voltage angular frequency is ω.Busbar voltageUWink Shi Xiangwei isθ.
Busbar voltageUWith electric currentI c I L Between relation be:
Wherein voltage instantaneous vector calculate only with electric currentI c I L , electric capacityC 1Dielectric dissipation factor tan δ1, electric capacityC 2's Dielectric dissipation factor tan δ2, capacitance partial pressure is more relevant than K, unrelated with the angular frequency of voltage and the capacitance of derided capacitors.
Voltage transient vector tangent value computing formula:
WhenWhen, described busbar voltage instantaneous Phase placeθFor:
WhenWhen, the wink of described busbar voltage Shi XiangweiθFor:
It is more than presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, produced function is made With without departing from technical solution of the present invention scope when, belong to protection scope of the present invention.

Claims (1)

1. a kind of busbar voltage phase measurement device of capacitance type potential transformer is it is characterised in that include:
First current transformer, described first current transformer accesses the earth terminal of the middle voltage capacitance of capacitance type potential transformer, For voltage capacitance earth current in collection;
Second current transformer, described second current transformer accesses the ground connection of the intermediate transformer of capacitance type potential transformer End, for gathering intermediate transformer earth current;
Current vector gathers computing unit, described current vector collection computing unit and described first current transformer, the second electricity The outfan of current transformer is connected, and is processed with the current signal to collection, and is converted to digital signal, then passes through number Value is calculated the instantaneous phase of the busbar voltage of capacitance type potential transformer;Described current vector collection computing unit includes letter Number process circuit, analog-digital converter and digital signal processor, described first current transformer, the output of the second current transformer End is connected with the input of signal processing circuit described in respectively, the outfan of described two signal processing circuits respectively with described The input of analog-digital converter is connected, the input phase of the outfan of described analog-digital converter and described digital signal processor Connect;
Described capacitance type potential transformer includes bleeder circuit, and described bleeder circuit includes derided capacitors C1With derided capacitors C2, institute State derided capacitors C1It is high-voltage capacitance C1, described derided capacitors C2Voltage capacitance C in being2;Surveyed using described busbar voltage phase place Described in amount measurement device, the method for the busbar voltage phase place of capacitance type potential transformer, comprises the following steps:
(1) the first current transformer, the second current transformer are respectively connected to the connecing of middle voltage capacitance of capacitance type potential transformer Ground terminal and the earth terminal of intermediate transformer;
The current signal that (2) first current transformers will be coupled into sends into a signal processing circuit, and the second current transformer will The current signal being coupled to sends into another signal processing circuit, to input current signal be amplified, Filtering Processing;
(3) current signal after processing is sent into analog-digital converter by signal processing circuit respectively, and current signal is converted to number Word signal;
(4) digital signal that analog-digital converter obtains sampling sends into digital signal processor, obtains electric capacity by numerical computations Instantaneous phase θ of the busbar voltage of formula voltage transformer;
As Im ((K-1) (Ic+IL)(1+jtanδ1)+Ic(1+jtanδ2)) < 0 when, instantaneous phase θ of described busbar voltage is:
θ = a c tan [ - Re ( ( K - 1 ) ( I c + I L ) ( 1 + jtanδ 1 ) + I c ( 1 + jtanδ 2 ) ) Im ( ( K - 1 ) ( I c + I L ) ( 1 + jtanδ 1 ) + I c ( 1 + jtanδ 2 ) ) ]
As Im ((K-1) (Ic+IL)(1+jtanδ1)+Ic(1+jtanδ2)) > 0 when, instantaneous phase θ of described busbar voltage is:
θ = π + a c tan [ - Re ( ( K - 1 ) ( I c + I L ) ( 1 + jtanδ 1 ) + I c ( 1 + jtanδ 2 ) ) Im ( ( K - 1 ) ( I c + I L ) ( 1 + jtanδ 1 ) + I c ( 1 + jtanδ 2 ) ) ]
Wherein, K represents intrinsic standoff ratio, IcRepresent and flow through middle voltage capacitance C2Electric current, ILRepresent and flow through intermediate transformer primary side electricity Stream, j represents imaginary part, δ1、δ2Represent derided capacitors C respectively1、C2Dielectric loss angle, capacitance type potential transformer is normal During work, derided capacitors C1Dielectric dissipation factor be tan δ1, derided capacitors C2Dielectric dissipation factor be tan δ2, intrinsic standoff ratio For K=(C1+C2)/C1, Re (), Im () represent real part and the imaginary part of complex function respectively.
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CN104034977B (en) * 2014-05-29 2016-09-07 国家电网公司 Capacitance type potential transformer live detection instrument
CN106383280B (en) * 2016-09-06 2019-02-05 国网新疆电力公司电力科学研究院 The voltage transformer Model test Method of line model is maked somebody a mere figurehead based on two nodes
CN106771645B (en) * 2016-12-12 2019-06-25 国网四川省电力公司电力科学研究院 Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system
US10802054B2 (en) 2017-09-22 2020-10-13 Schweitzer Engineering Laboratories, Inc. High-fidelity voltage measurement using a capacitance-coupled voltage transformer
WO2019060841A1 (en) 2017-09-22 2019-03-28 Schweitzer Engineering Laboratories, Inc. High-fidelity voltage measurement using resistive divider in a capacitance-coupled voltage transformer
US10989752B2 (en) 2017-09-22 2021-04-27 Schweitzer Engineering Laboratories, Inc. Distance protection using traveling waves in an electric power delivery system
CN107884737B (en) * 2017-11-13 2020-02-14 国网福建省电力有限公司 Wireless high-precision synchronous on-site capacitive equipment on-line monitoring and checking system and method

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