CN107515349A - A kind of method and system for calculating substation fault earth current and lightning conducter diverting coefficient - Google Patents

A kind of method and system for calculating substation fault earth current and lightning conducter diverting coefficient Download PDF

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Publication number
CN107515349A
CN107515349A CN201710725817.9A CN201710725817A CN107515349A CN 107515349 A CN107515349 A CN 107515349A CN 201710725817 A CN201710725817 A CN 201710725817A CN 107515349 A CN107515349 A CN 107515349A
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China
Prior art keywords
ground
short circuit
substation
current
transformer
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Inventor
范冕
谭波
童雪芳
王湘汉
张波
李振强
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Priority to CN201710725817.9A priority Critical patent/CN107515349A/en
Publication of CN107515349A publication Critical patent/CN107515349A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2516—Modular arrangements for computer based systems; using personal computers (PC's), e.g. "virtual instruments"
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/30—Circuit design
    • G06F30/36—Circuit design at the analogue level
    • G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

Abstract

The invention discloses a kind of method for calculating substation fault earth current and lightning conducter diverting coefficient, including：According to the main wiring diagram of transformer station and its connection in network system, each current component and distribution situation when determining substation grounding short trouble；According to each current component and distribution situation, equivalent circuit during substation grounding short trouble is determined；Establish the equivalent model of substation line according to the design conditions of transformer station, transient state, steady-state process under analogue ground short circuit fault condition, obtain each current component value during ground short circuit failure；The earth current and lightning conducter diverting coefficient during ground short circuit failure are calculated according to equivalent circuit and each current component value.The present invention provides theory support for the security performance of accurate evaluation ultra-high voltage transformer station ground potential liter in failure conditions, step voltage, contact potential and secondary device, has important application value to the design safety performance and optimization design level of raising ultra-high voltage transformer station earth mat.

Description

A kind of method for calculating substation fault earth current and lightning conducter diverting coefficient and System
Technical field
Calculated the present invention relates to power grid security in power system and protection application field, and more particularly, to one kind The method and system of substation fault earth current and lightning conducter diverting coefficient.
Background technology
At the beginning of the design of substation ground network is carried out, designing unit needs the short circuit current being likely to occur to power network and taken shelter from the thunder Line diverting coefficient carries out calculating assessment.However, designing unit mostly uses the reduced mechanical model in regular method and reckoner Calculated.By this computational methods, the equivalent impedance figure of short circuit calculation is obtained according to the main wiring diagram of system first, in conjunction with Short circuit current total under various fault conditions is calculated in each sequence impedance parameter of system.Finally, calculated according to simplified formula The lightning conducter diverting coefficient arrived, COMPREHENSIVE CALCULATING are obtained into ground short circuit electric current.
Many equivalent formulations in this computational methods are proposed based on passing experience in design, have ignored many sensitivities Factor to affect.Influence of many factors such as overhead line structures span, grounding resistance to shunting can not be considered.What is be calculated enters ground Short circuit current is bigger than normal, makes the design of earthed system too conservative, the Technical Economy of earthed system engineering design is not high.
The content of the invention
The invention provides a kind of method and system for calculating substation fault earth current and lightning conducter diverting coefficient, with Solves the problems, such as the determination of ultra-high voltage transformer station failure earth current and lightning conducter diverting coefficient.
In order to solve the above problems, according to an aspect of the invention, there is provided a kind of substation fault that calculates enters ground electricity The method of stream and lightning conducter diverting coefficient, methods described include：
According to the main wiring diagram of transformer station and its connection in network system, substation grounding short trouble is determined When each current component and distribution situation；
According to each current component and distribution situation during the substation grounding short trouble, substation grounding short circuit is determined Equivalent circuit during failure；
The equivalent model of substation line is established according to the design conditions of transformer station, under analogue ground short circuit fault condition Transient state, steady-state process, obtain each current component value during ground short circuit failure；
The earth current and lightning conducter during ground short circuit failure are calculated according to the equivalent circuit and each current component value Diverting coefficient.
Preferably, wherein the substation grounding short trouble includes：Ground short circuit failure and outer transmission line of electricity of standing in standing Ground short circuit failure.
Preferably, wherein
When the substation grounding short trouble for ground short circuit failure in station when, during the substation grounding short trouble Each current component and distribution situation, including：
The short circuit current that transformer substation side provides, the electric current are directly back to transformer by the earth mat below at internal fault of standing Neutral point, the current component are not passed through the earth；
The short circuit current provided by power-supply system, the electric current flow back into the transformer neutral point of power-supply system side, including：It is logical Cross returning for the transformer neutral point of " ground wire-shaft tower " ground connection return power-supply system side for the overhead transmission line being connected with substation ground network Electric current is flowed, and the earth, the back flow current of the transformer neutral point through greatly flowing back to power-supply system side are flowed into by grounded screen；
When the substation grounding short trouble is to stand outer transmission line of electricity ground short circuit failure, the substation grounding is short Each current component and distribution situation during the failure of road, including：
The short circuit current that transformer substation side provides, the electric current include：By line fault position by with this substation ground network " ground wire-shaft tower " ground connection of connection returns to the transformer neutral point electric current of transformer station, and by tower grounding device at failure Flow into the earth, the electric current of the transformer neutral point through greatly flowing back to this transformer substation side；
The short circuit current provided by power-supply system side, the electric current include：By line fault position by with offside power supply " ground wire-shaft tower " ground connection of substation ground network connection returns to the electric current of offside transformer neutral point, and by shaft tower at failure Earthing or grounding means flows into the earth, through the electric current for greatly flowing back to offside transformer neutral point.
Preferably, wherein the design conditions according to transformer station establish the equivalent model of substation line, analogue ground Transient state, steady-state process under short circuit fault condition, each current component value during ground short circuit failure is obtained, including：
Using ATP-EMTP simulation softwares, according to the design conditions of transformer station, using JMarti frequency characteristic circuit models, Consider pole tower ground resistance, line length and span factor, establish the equivalent model of substation line, simulate to ground short circuit event Transient state, steady-state process under the conditions of barrier, obtain each current component value during ground short circuit failure.
Preferably, wherein electric arc arc road resistance when being discharged at the ground short circuit failure is 2 Ω.
According to another aspect of the present invention, there is provided one kind calculates substation fault earth current and lightning conducter shunting system Several systems, the system include：Current component and distribution situation determining unit, equivalent current determining unit, current component value Acquiring unit and computing unit,
The current component and distribution situation determining unit, for the main wiring diagram according to transformer station and its in network system In connection, each current component and distribution situation when determining substation grounding short trouble；
The equivalent current determining unit, for according to each current component during the substation grounding short trouble and point Cloth situation, determine equivalent circuit during substation grounding short trouble；
The current component value acquiring unit, for establishing the equivalent mould of substation line according to the design conditions of transformer station Type, transient state, steady-state process under analogue ground short circuit fault condition, obtains each current component value during ground short circuit failure；
The computing unit, for according to the entering when equivalent circuit and each current component value calculating ground short circuit failure Earth-current and lightning conducter diverting coefficient.
Preferably, wherein the substation grounding short trouble includes：Ground short circuit failure and outer transmission line of electricity of standing in standing Ground short circuit failure.
Preferably, wherein
When the substation grounding short trouble for ground short circuit failure in station when, during the substation grounding short trouble Each current component and distribution situation, including：
The short circuit current that transformer substation side provides, the electric current are directly back to transformer by the earth mat below at internal fault of standing Neutral point, the current component are not passed through the earth；
The short circuit current provided by power-supply system, the electric current flow back into the transformer neutral point of power-supply system side, including：It is logical Cross returning for the transformer neutral point of " ground wire-shaft tower " ground connection return power-supply system side for the overhead transmission line being connected with substation ground network Electric current is flowed, and the earth, the back flow current of the transformer neutral point through greatly flowing back to power-supply system side are flowed into by grounded screen；
When the substation grounding short trouble is to stand outer transmission line of electricity ground short circuit failure, the substation grounding is short Each current component and distribution situation during the failure of road, including：
The short circuit current that transformer substation side provides, the electric current include：By line fault position by with this substation ground network " ground wire-shaft tower " ground connection of connection returns to the transformer neutral point electric current of transformer station, and by tower grounding device at failure Flow into the earth, the electric current of the transformer neutral point through greatly flowing back to this transformer substation side；
The short circuit current provided by power-supply system side, the electric current include：By line fault position by with offside power supply " ground wire-shaft tower " ground connection of substation ground network connection returns to the electric current of offside transformer neutral point, and by shaft tower at failure Earthing or grounding means flows into the earth, through the electric current for greatly flowing back to offside transformer neutral point.
Preferably, wherein the current component value acquiring unit, including：
Using ATP-EMTP simulation softwares, according to the design conditions of transformer station, using JMarti frequency characteristic circuit models, Consider pole tower ground resistance, line length and span factor, establish the equivalent model of substation line, simulate to ground short circuit event Transient state, steady-state process under the conditions of barrier, obtain each current component value during ground short circuit failure.
Preferably, wherein electric arc arc road resistance when being discharged at the ground short circuit failure is 2 Ω.
The invention provides a kind of method and system for calculating substation fault earth current and lightning conducter diverting coefficient, root According to the main wiring diagram of transformer station and its connection in network system, each electric current during substation grounding short trouble is determined Component and distribution situation；Determine equivalent circuit during substation grounding short trouble；Established and become according to the design conditions of transformer station The equivalent model of power station circuit, and then earth current and lightning conducter diverting coefficient during calculating ground short circuit failure.Utilize ATP-EMTP simulation softwares are modeled emulation to transient state, the stable situation of transformer station, and computational accuracy is high, and speed is fast, is accurate Assess the security performance of ultra-high voltage transformer station ground potential liter in failure conditions, step voltage, contact potential and secondary device Theory support is provided, has important application to the design safety performance and optimization design level for improving ultra-high voltage transformer station earth mat Value.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is the method according to the calculating substation fault earth current and lightning conducter diverting coefficient of embodiment of the present invention 100 flow chart；
The a certain earth current schematic diagram for returning back out line when Fig. 2 is the station internal fault according to embodiment of the present invention；
The a certain earth current schematic diagram for returning back out line when Fig. 3 is failure outside the station according to embodiment of the present invention；
The equivalent circuit diagram of earth current when Fig. 4 is the station internal fault according to embodiment of the present invention；
The equivalent circuit diagram of earth current when Fig. 5 is failure outside the station according to embodiment of the present invention；And
Fig. 6 is according to the calculating substation fault earth current of embodiment of the present invention and the system of lightning conducter diverting coefficient 600 structural representation.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes Formula is implemented, and is not limited to embodiment described herein, there is provided these embodiments are to disclose at large and fully The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that and its The linguistic context of association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is the method according to the calculating substation fault earth current and lightning conducter diverting coefficient of embodiment of the present invention 100 flow chart.The calculating substation fault earth current and the method for lightning conducter diverting coefficient that embodiment of the present invention provides, It can include：According to the main wiring diagram of transformer station and its connection in network system, substation grounding short circuit event is determined Each current component and distribution situation during barrier；According to each current component during the substation grounding short trouble and distribution feelings Condition, determine equivalent circuit during substation grounding short trouble；According to the design conditions of transformer station establish substation line etc. Model is imitated, transient state, steady-state process under analogue ground short circuit fault condition, obtains each current component during ground short circuit failure Value；Earth current and lightning conducter shunting when calculating ground short circuit failure according to the equivalent circuit and each current component value are Number.This method to the ground potential liter (GPR) in failure conditions of accurate evaluation ultra-high voltage transformer station in design, step voltage, connect Electric shock gesture and the security performance of secondary device provide theory support, the design safety performance to improving ultra-high voltage transformer station earth mat And optimization design level has important application value.
The calculating substation fault earth current of embodiment of the present invention and the method 100 of lightning conducter diverting coefficient, in step Start at rapid 101, in step 101 according to the main wiring diagram of transformer station and its connection in network system, determine power transformation Each current component and distribution situation during ground short circuit failure of standing.Preferably, wherein the substation grounding short trouble includes： Ground short circuit failure and outer transmission line of electricity ground short circuit failure of standing in standing.Preferably, wherein
When the substation grounding short trouble for ground short circuit failure in station when, during the substation grounding short trouble Each current component and distribution situation, including：
The short circuit current that transformer substation side provides, the electric current are directly back to transformer by the earth mat below at internal fault of standing Neutral point, the current component are not passed through the earth；
The short circuit current provided by power-supply system, the electric current flow back into the transformer neutral point of power-supply system side, including：It is logical Cross returning for the transformer neutral point of " ground wire-shaft tower " ground connection return power-supply system side for the overhead transmission line being connected with substation ground network Electric current is flowed, and the earth, the back flow current of the transformer neutral point through greatly flowing back to power-supply system side are flowed into by grounded screen；
When the substation grounding short trouble is to stand outer transmission line of electricity ground short circuit failure, the substation grounding is short Each current component and distribution situation during the failure of road, including：
The short circuit current that transformer substation side provides, the electric current include：By line fault position by with this substation ground network " ground wire-shaft tower " ground connection of connection returns to the transformer neutral point electric current of transformer station, and by tower grounding device at failure Flow into the earth, the electric current of the transformer neutral point through greatly flowing back to this transformer substation side；
The short circuit current provided by power-supply system side, the electric current include：By line fault position by with offside power supply " ground wire-shaft tower " ground connection of substation ground network connection returns to the electric current of offside transformer neutral point, and by shaft tower at failure Earthing or grounding means flows into the earth, through the electric current for greatly flowing back to offside transformer neutral point.
The a certain earth current schematic diagram for returning back out line when Fig. 2 is the station internal fault according to embodiment of the present invention.Such as Fig. 2 institutes Show, failure earth current mainly there are following several return flow lines at open circuit：First, the short circuit current I provided by transformer substation sideZ, By the way that the earth mat of lower section is directly back to transformer neutral point at open circuit in station.The current component is not passed through the earth；Remaining, by electricity The short circuit current I that source system providesSThen flow back into the transformer neutral point of power-supply system side, and ISThe path of backflow has 2：One Part returns to the transformation of power-supply system side by " ground wire-shaft tower " earthed system for the overhead transmission line being connected with this substation ground network Device neutral point, i.e. IB；Another part flows into the earth by grounded screen, through greatly flowing back to the transformer neutral point of power-supply system side, That is ID。
The a certain earth current schematic diagram for returning back out line when Fig. 3 is failure outside the station according to embodiment of the present invention.Such as Fig. 3 institutes Show, during external short circuit failure of standing, open circuit place failure earth current mainly there are several return flow lines as follows：Wherein provided by transformer substation side Short circuit current IZ, a part is grounded by line fault position by " ground wire-shaft tower " that is connected with this substation ground network is System returns to the transformer neutral point of this ultra-high voltage transformer station, i.e. IB1.Another part flows into big by tower grounding device at failure Ground, through greatly flowing back to the transformer neutral point of this transformer substation side, i.e. ID1；Equally, wherein the short circuit electricity provided by power-supply system side Flow IS, a part passes through " ground wire-shaft tower " earthed system for being connected with offside source substation earth mat by line fault position Return to offside transformer neutral point, i.e. IB2.Another part flows into the earth by tower grounding device at failure, through greatly flowing back to pair Side transformer neutral point, i.e. ID2。
Preferably, each current component and distribution situation when step 102 is according to the substation grounding short trouble, really Determine equivalent circuit during substation grounding short trouble.In embodiments of the present invention, according to Fig. 2 and Fig. 3, set with reference to system Meter situation, when making ground short circuit failure respectively in ground fault current equivalent circuit diagram：Fig. 4 and Fig. 5, and to equivalent circuit diagram Circuit analysis is carried out, obtains the calculation formula into ground short circuit electric current and lightning conducter diverting coefficient.
The equivalent circuit diagram of earth current when Fig. 4 is the station internal fault according to embodiment of the present invention.It is as shown in figure 4, right In station internal fault, have：
Total short circuit current at failure：Imax=IZ+IS,
Enter ground short circuit electric current：ID=IS-IB1,
Ground wire diverting coefficient：
The equivalent circuit diagram of earth current when Fig. 5 is failure outside the station according to embodiment of the present invention.It is as shown in figure 5, right In outer failure of standing, have：
Total short circuit current at failure：Imax=IZ+IS,
Transformer substation side enters ground short circuit electric current：ID1=IZ-IB1,
Power-supply system side enters ground short circuit electric current：ID2=IS-IB2,
The ground wire diverting coefficient of transformer substation side：
Preferably, the equivalent model of substation line, analogue ground are established according to the design conditions of transformer station in step 103 Transient state, steady-state process under short circuit fault condition, obtain each current component value during ground short circuit failure.Preferably, wherein institute State the equivalent model that substation line is established according to the design conditions of transformer station, transient state under analogue ground short circuit fault condition, Steady-state process, each current component value during ground short circuit failure is obtained, including：
Using ATP-EMTP simulation softwares, according to the design conditions of transformer station, using JMarti frequency characteristic circuit models, Consider pole tower ground resistance, line length and span factor, establish the equivalent model of substation line, simulate to ground short circuit event Transient state, steady-state process under the conditions of barrier, obtain each current component value during ground short circuit failure.
Preferably, wherein electric arc arc road resistance when being discharged at the ground short circuit failure is 2 Ω.
In embodiments of the present invention, according to the design conditions of extra-high voltage project, using JMarti frequency characteristic circuits Model establishes the equivalent model of the outlet circuit of ultra-high voltage transformer station.Meanwhile pole tower ground resistance, circuit are take into account in model Influence of the factors such as length, span to ground short circuit transient process.Due to by wiring system and earth system be thought of as one it is whole Volume grid models, and the mutual impedance that wire and ground wire are take into account in network matrix calculating acts on so that result of calculation is more accurate Really.Transformer model has single-phase or three-phase ideal transformer model, single-phase or three-phase saturation transformer model, three in ATP-EMTP The high balanced impedance saturation transformer model of phase core type and BCTRAN support subprogram.It can be joined according to nameplate on extra-high voltage transformer Number situation simulation modelling.Meanwhile electric arc arc road impedance when being discharged at short circuit is considered in model, calculate Zhong Gaihu roads resistance and press Static resistance considers that value is 2 Ω.Transient state, the stable situation of transformer station are modeled using ATP-EMTP simulation softwares imitative Very, computational accuracy is high, and speed is fast, for accurate evaluation ultra-high voltage transformer station ground potential liter in failure conditions, step voltage, connects Electric shock gesture and the security performance of secondary device provide theory support, the design safety performance to improving ultra-high voltage transformer station earth mat And optimization design level has important application value.
Preferably, entering when step 104 calculates ground short circuit failure according to the equivalent circuit and each current component value Earth-current and lightning conducter diverting coefficient.In embodiments of the present invention, based on ATP-EMTP simulation softwares respectively to Fig. 2, The earthed system of transmission line of electricity, transformer, Short-way model, earth mat and shaft tower in Fig. 3 is modeled, and calculates short circuit fault condition Under transient state, steady-state process, obtain short circuit current I total at failuremaxAnd IZ、IS、IB、IDEtc. parameter.Finally by these parameters Substitute into the calculation formula for entering ground short circuit electric current and lightning conducter diverting coefficient proposed according to Fig. 4 and Fig. 5, station is calculated respectively Enter ground short circuit electric current and lightning conducter diverting coefficient when internal short-circuit failure and station external short circuit failure.
Fig. 6 is according to the calculating substation fault earth current of embodiment of the present invention and the system of lightning conducter diverting coefficient 600 structural representation.As shown in fig. 6, the system 600 for calculating substation fault earth current and lightning conducter diverting coefficient Including：Current component and distribution situation determining unit 601, equivalent current determining unit 602, current component value acquiring unit 603 With computing unit 604.Preferably, 601 yuan of list is determined in the current component and distribution situation, according to the main wiring diagram of transformer station And its connection in network system, each current component and distribution situation when determining substation grounding short trouble.It is excellent Selection of land, wherein the substation grounding short trouble includes：Ground short circuit failure and outer transmission line of electricity ground short circuit event of standing in standing Barrier.
Preferably, wherein
When the substation grounding short trouble for ground short circuit failure in station when, during the substation grounding short trouble Each current component and distribution situation, including：
The short circuit current that transformer substation side provides, the electric current are directly back to transformer by the earth mat below at internal fault of standing Neutral point, the current component are not passed through the earth；
The short circuit current provided by power-supply system, the electric current flow back into the transformer neutral point of power-supply system side, including：It is logical Cross returning for the transformer neutral point of " ground wire-shaft tower " ground connection return power-supply system side for the overhead transmission line being connected with substation ground network Electric current is flowed, and the earth, the back flow current of the transformer neutral point through greatly flowing back to power-supply system side are flowed into by grounded screen；
When the substation grounding short trouble is to stand outer transmission line of electricity ground short circuit failure, the substation grounding is short Each current component and distribution situation during the failure of road, including：
The short circuit current that transformer substation side provides, the electric current include：By line fault position by with this substation ground network " ground wire-shaft tower " ground connection of connection returns to the transformer neutral point electric current of transformer station, and by tower grounding device at failure Flow into the earth, the electric current of the transformer neutral point through greatly flowing back to this transformer substation side；
The short circuit current provided by power-supply system side, the electric current include：By line fault position by with offside power supply " ground wire-shaft tower " ground connection of substation ground network connection returns to the electric current of offside transformer neutral point, and by shaft tower at failure Earthing or grounding means flows into the earth, through the electric current for greatly flowing back to offside transformer neutral point.
Preferably, in the equivalent current determining unit 602, according to each electric current during the substation grounding short trouble Component and distribution situation, determine equivalent circuit during substation grounding short trouble.
Preferably, in the current component value acquiring unit 603, substation line is established according to the design conditions of transformer station Equivalent model, transient state, steady-state process under analogue ground short circuit fault condition, obtain each electric current point during ground short circuit failure Value.Preferably, wherein the current component value acquiring unit, including：
Using ATP-EMTP simulation softwares, according to the design conditions of transformer station, using JMarti frequency characteristic circuit models, Consider pole tower ground resistance, line length and span factor, establish the equivalent model of substation line, simulate to ground short circuit event Transient state, steady-state process under the conditions of barrier, obtain each current component value during ground short circuit failure.
Preferably, wherein electric arc arc road resistance when being discharged at the ground short circuit failure is 2 Ω.
Preferably, in the computing unit 604, ground short circuit event is calculated according to the equivalent circuit and each current component value Earth current and lightning conducter diverting coefficient during barrier.
The calculating substation fault earth current of embodiments of the invention and the system 600 of lightning conducter diverting coefficient and this hair The calculating substation fault earth current of another bright embodiment and the method 100 of lightning conducter diverting coefficient are corresponding, herein Repeat no more.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as What subsidiary Patent right requirement was limited, except the present invention other embodiments disclosed above equally fall the present invention's In the range of.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field Release, unless clearly being defined in addition wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein Step need not all be run with disclosed accurately order, unless explicitly stated otherwise.

Claims (10)

  1. A kind of 1. method for calculating substation fault earth current and lightning conducter diverting coefficient, it is characterised in that methods described bag Include：
    According to the main wiring diagram of transformer station and its connection in network system, when determining substation grounding short trouble Each current component and distribution situation；
    According to each current component and distribution situation during the substation grounding short trouble, substation grounding short trouble is determined When equivalent circuit；
    Establish the equivalent model of substation line according to the design conditions of transformer station, it is temporary under analogue ground short circuit fault condition State, steady-state process, obtain each current component value during ground short circuit failure；
    Earth current and lightning conducter when calculating ground short circuit failure according to the equivalent circuit and each current component value shunt Coefficient.
  2. 2. according to the method for claim 1, it is characterised in that the substation grounding short trouble includes：It is grounded in standing Short trouble and outer transmission line of electricity ground short circuit failure of standing.
  3. 3. according to the method for claim 2 characterized in that,
    When the substation grounding short trouble for ground short circuit failure in station when, it is each during the substation grounding short trouble Current component and distribution situation, including：
    The short circuit current that transformer substation side provides, the electric current are directly back to transformer neutrality by the earth mat below at internal fault of standing Point, the current component are not passed through the earth；
    The short circuit current provided by power-supply system, the electric current flow back into the transformer neutral point of power-supply system side, including：By with " ground wire-shaft tower " ground connection of the overhead transmission line of substation ground network connection returns to the backflow electricity of the transformer neutral point of power-supply system side Stream, and flow into the earth, the back flow current of the transformer neutral point through greatly flowing back to power-supply system side by grounded screen；
    When the substation grounding short trouble is to stand outer transmission line of electricity ground short circuit failure, the substation grounding short circuit event Each current component and distribution situation during barrier, including：
    The short circuit current that transformer substation side provides, the electric current include：By line fault position by being connected with this substation ground network " ground wire-shaft tower " ground connection return to the transformer neutral point electric current of transformer station, and flowed into by tower grounding device at failure Greatly, the electric current of the transformer neutral point through greatly flowing back to this transformer substation side；
    The short circuit current provided by power-supply system side, the electric current include：By line fault position by with offside power supply power transformation " ground wire-shaft tower " ground connection of earth mat of standing connection returns to the electric current of offside transformer neutral point, and by tower grounding at failure Device flows into the earth, through the electric current for greatly flowing back to offside transformer neutral point.
  4. 4. the method according to claims 1 to 3, it is characterised in that the design conditions according to transformer station establish power transformation The equivalent model on station track road, transient state, steady-state process under analogue ground short circuit fault condition are each when obtaining ground short circuit failure Current component value, including：
    Using ATP-EMTP simulation softwares, according to the design conditions of transformer station, using JMarti frequency characteristic circuit models, consider Pole tower ground resistance, line length and span factor, the equivalent model of substation line is established, simulated to ground short circuit failure bar Transient state, steady-state process under part, obtain each current component value during ground short circuit failure.
  5. 5. according to the method for claim 4, it is characterised in that electric arc arc road electricity when being discharged at the ground short circuit failure Hinder for 2 Ω.
  6. A kind of 6. system for calculating substation fault earth current and lightning conducter diverting coefficient, it is characterised in that the system bag Include：Current component and distribution situation determining unit, equivalent current determining unit, current component value acquiring unit and computing unit,
    The current component and distribution situation determining unit, for the main wiring diagram according to transformer station and its in network system Connection, each current component and distribution situation when determining substation grounding short trouble；
    The equivalent current determining unit, for according to each current component during the substation grounding short trouble and distribution feelings Condition, determine equivalent circuit during substation grounding short trouble；
    The current component value acquiring unit, for establishing the equivalent model of substation line according to the design conditions of transformer station, Transient state, steady-state process under analogue ground short circuit fault condition, obtain each current component value during ground short circuit failure；
    The computing unit, for entering ground electricity according to when the equivalent circuit and each current component value calculating ground short circuit failure Stream and lightning conducter diverting coefficient.
  7. 7. system according to claim 6, it is characterised in that the substation grounding short trouble includes：It is grounded in standing Short trouble and outer transmission line of electricity ground short circuit failure of standing.
  8. 8. system according to claim 7, it is characterised in that
    When the substation grounding short trouble for ground short circuit failure in station when, it is each during the substation grounding short trouble Current component and distribution situation, including：
    The short circuit current that transformer substation side provides, the electric current are directly back to transformer neutrality by the earth mat below at internal fault of standing Point, the current component are not passed through the earth；
    The short circuit current provided by power-supply system, the electric current flow back into the transformer neutral point of power-supply system side, including：By with " ground wire-shaft tower " ground connection of the overhead transmission line of substation ground network connection returns to the backflow electricity of the transformer neutral point of power-supply system side Stream, and flow into the earth, the back flow current of the transformer neutral point through greatly flowing back to power-supply system side by grounded screen；
    When the substation grounding short trouble is to stand outer transmission line of electricity ground short circuit failure, the substation grounding short circuit event Each current component and distribution situation during barrier, including：
    The short circuit current that transformer substation side provides, the electric current include：By line fault position by being connected with this substation ground network " ground wire-shaft tower " ground connection return to the transformer neutral point electric current of transformer station, and flowed into by tower grounding device at failure Greatly, the electric current of the transformer neutral point through greatly flowing back to this transformer substation side；
    The short circuit current provided by power-supply system side, the electric current include：By line fault position by with offside power supply power transformation " ground wire-shaft tower " ground connection of earth mat of standing connection returns to the electric current of offside transformer neutral point, and by tower grounding at failure Device flows into the earth, through the electric current for greatly flowing back to offside transformer neutral point.
  9. 9. the system according to claim 6 to 8, it is characterised in that the current component value acquiring unit, including：
    Using ATP-EMTP simulation softwares, according to the design conditions of transformer station, using JMarti frequency characteristic circuit models, consider Pole tower ground resistance, line length and span factor, the equivalent model of substation line is established, simulated to ground short circuit failure bar Transient state, steady-state process under part, obtain each current component value during ground short circuit failure.
  10. 10. system according to claim 9, it is characterised in that electric arc arc road when being discharged at the ground short circuit failure Resistance is 2 Ω.
CN201710725817.9A 2017-08-22 2017-08-22 A kind of method and system for calculating substation fault earth current and lightning conducter diverting coefficient Pending CN107515349A (en)

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CN111398707A (en) * 2020-03-16 2020-07-10 西安交通大学 Lightning current shunt characteristic calculation method of triangular tower communication base station system
CN112395788A (en) * 2020-10-19 2021-02-23 国网江西省电力有限公司电力科学研究院 Personal safety accurate evaluation method for distribution network neutral point grounding type reconstruction
CN112487650A (en) * 2020-12-04 2021-03-12 广东电网有限责任公司电力科学研究院 Unipolar short-circuit current calculation method and device of flexible direct-current power grid
CN112684273A (en) * 2021-01-06 2021-04-20 国核电力规划设计研究院重庆有限公司 Grounding current shunting method for grounding short circuit fault of 110kV full-cable outgoing substation
CN112924789A (en) * 2020-12-30 2021-06-08 广东电网有限责任公司电力科学研究院 Method and device for monitoring ground current of short circuit between station and external ground through grounding network

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111398707A (en) * 2020-03-16 2020-07-10 西安交通大学 Lightning current shunt characteristic calculation method of triangular tower communication base station system
CN112395788A (en) * 2020-10-19 2021-02-23 国网江西省电力有限公司电力科学研究院 Personal safety accurate evaluation method for distribution network neutral point grounding type reconstruction
CN112487650A (en) * 2020-12-04 2021-03-12 广东电网有限责任公司电力科学研究院 Unipolar short-circuit current calculation method and device of flexible direct-current power grid
CN112924789A (en) * 2020-12-30 2021-06-08 广东电网有限责任公司电力科学研究院 Method and device for monitoring ground current of short circuit between station and external ground through grounding network
CN112684273A (en) * 2021-01-06 2021-04-20 国核电力规划设计研究院重庆有限公司 Grounding current shunting method for grounding short circuit fault of 110kV full-cable outgoing substation
CN112684273B (en) * 2021-01-06 2023-08-29 国核电力规划设计研究院重庆有限公司 Grounding current diversion method for grounding short-circuit fault of 110kV full-cable outlet transformer substation

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