WO2010004757A1 - 事故点標定方法および事故点標定装置 - Google Patents
事故点標定方法および事故点標定装置 Download PDFInfo
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- WO2010004757A1 WO2010004757A1 PCT/JP2009/003221 JP2009003221W WO2010004757A1 WO 2010004757 A1 WO2010004757 A1 WO 2010004757A1 JP 2009003221 W JP2009003221 W JP 2009003221W WO 2010004757 A1 WO2010004757 A1 WO 2010004757A1
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Definitions
- the present invention relates to an accident point locating method and an accident point locating device for calculating a distance to an accident point using a current / voltage of a transmission line and a transmission line line constant, and locating the accident point.
- the conventional accident point locating method which calculates the distance to the accident point by calculating the impedance (resistance) from the current and voltage flowing through the transmission line, and locates the accident point, is the accident point seen from both ends of the target section It implements using the conditions that voltage (vector quantity) is equal (for example, refer nonpatent literature 1).
- FIG. 19A is a circuit diagram of the transmission line
- FIG. 19B is a voltage distribution diagram in the length direction of the transmission line
- FIG. 19C is a relational expression that holds between the voltage and the current.
- the left side represents the voltage when the accident point 2 (point F) is viewed from the A terminal
- the right side represents the voltage when the accident point 2 (point F) is viewed from the B terminal.
- the distance x from the terminal to the accident point 2 (point F) is calculated by the following equation (2).
- Equation (2) is an equation that holds for the voltage and current vector quantities at both ends, and it is necessary to synchronize the current and voltage captured at both ends. Therefore, a method of synchronizing each terminal using a sampling synchronization signal or a GPS signal is employed (Patent Document 1).
- Patent Documents 2 and 3 that do not require synchronization of each terminal have the advantage of eliminating the need for a transmission / reception circuit such as a sampling synchronization signal or a GPS signal.
- a transmission / reception circuit such as a sampling synchronization signal or a GPS signal.
- an object of the present invention is to provide an accident point locating method and an accident point locating apparatus that can perform the accident locating with high accuracy by simple and direct calculation without requiring synchronization of each terminal.
- the accident point locating method of the present invention is the accident point locating method for locating the accident point using the voltage, current and transmission line constant of each terminal of the power line to be standardized.
- the distance from the predetermined end to the accident point is calculated by solving a quadratic equation obtained as a fault point where the square value of the magnitude of the fault point voltage in the accident phase is equal.
- the accident point locating device of the present invention is an accident point locating device for locating an accident point using the voltage, current and transmission line line constant of each terminal of the power line to be standardized. It is characterized by that.
- the input processing unit preliminarily sets one or more set values including data input means for performing digital conversion and data storage time on each terminal of the power transmission line to be standardized, and this set value.
- the data storage means for storing the electric quantity data in the memory when an accident occurs and the data transmission means for transmitting the stored data are provided.
- the orientation processing unit includes at least one set value including data acquisition means for acquiring data transmitted from the input processing unit installed at each terminal via a transmission medium, and a line constant of the orientation target transmission line.
- An orientation calculation means for performing an orientation calculation for calculating a distance from a predetermined end to the accident point by solving a quadratic equation, and an orientation result output means for outputting an orientation result of the orientation calculation means.
- an accident point locating method and an accident point locating device that do not require synchronization at each terminal and can perform an accident point location with high accuracy by simple and direct calculation.
- the accident point location method of the 2nd Embodiment of this invention is shown, (a) is a circuit diagram of a transmission line, (b) is a figure which shows the voltage change of a transmission line length direction, (c) is between voltage and electric current.
- the flowchart which shows the processing function of the orientation process part employ
- (a) is a time series sample data example of the electric current of B terminal
- (b) shows the time series amplitude value example of the electric current of B terminal.
- Figure. The block block diagram of the accident point location apparatus for implement
- the flowchart which shows the processing function of the orientation process part employ
- (a) is a circuit diagram of a power transmission line
- (b) is a relational expression formed between voltage and current.
- the conventional fault point location method is shown, (a) is a circuit diagram of a power transmission line, (b) is a voltage distribution diagram in the length direction of the power transmission line, and (c) is a diagram showing a relational expression established between voltage and current.
- FIG. 1 is a block configuration diagram of an accident point locating device for realizing an accident point locating method according to a first embodiment of the present invention.
- FIGS. 2 and 3 are input processing units constituting the accident point locating device, respectively. It is a flowchart which shows the processing function of the orientation processing part.
- 1 is a two-terminal power transmission line to be standardized
- CT10A and CT10B are current transformers installed at the A terminal and B terminal of the power transmission line 1, respectively
- VT10A and VT10B are A terminal and B of the power transmission line 1, respectively. This is a voltage transformer installed at the terminal.
- the accident point locating device includes input processing units 10A and 10B installed at the A terminal and the B terminal, respectively, and an orientation processing unit 20 connected to these input processing units 10A and 10B via a transmission medium NET. It is configured.
- the input processing unit 10A installed at the A terminal is composed of, for example, a digital computer such as a microprocessor, and receives data and current from the current transformer CT10A and the voltage transformer VT10A to perform digital conversion 11A.
- Data storage that stores preset values such as data storage time, accident detection sensitivity, etc., and determines whether or not an accident has occurred based on these settings and stores the electrical quantity data in the memory when an accident occurs Means 12A and data transmission means 13A for transmitting stored data are provided. Since the input processing unit 10B installed at the B terminal is also configured in the same manner as the input processing unit 10A, the same elements as the input processing unit 10A are replaced with the subscript A and the description is omitted.
- the orientation processing unit 20 is also composed of, for example, a digital computer such as a microprocessor, and includes a data acquisition unit 21 that acquires data transmitted from the data transmission units 13A and 13B of the input processes 10A and 10B, and a transmission line 1 Set values such as the line length L and the transmission line line constant Z (vector quantity) per unit length are set in advance, and the accident point based on these set values and the current and voltage data acquired by the data acquisition means 21 And an orientation result output means 23 for outputting the orientation calculation result of the orientation calculation means 22.
- a digital computer such as a microprocessor
- the input process 100 executed as the processing function of the input processing units 10A and 10B will be described with reference to the flowchart shown in FIG.
- the subscripts A and B are omitted when there is no need to distinguish between the input processing unit on the A terminal side or the input processing unit on the B terminal side.
- the input processing unit 10 inputs the voltage / current data captured from each terminal in step 101.
- This step 101 is a processing step executed by the data input means 11 of FIG.
- step 102 whether or not an accident has occurred is confirmed based on preset values such as data storage time, accident detection sensitivity, etc., and it is determined that an accident has occurred (Y). Store current data.
- steps 102 and 103 are processing steps executed by the data storage means 12 of FIG.
- step 104 voltage / current data at the time of occurrence of the accident is transmitted to the orientation processing unit 20.
- This step 104 is a processing step executed by the data transmission means of FIG.
- the orientation processing 200 executed as the processing function of the orientation processing unit 20 will be described.
- the orientation processing unit 20 acquires the data transmitted from the input processing units 10A and 10B in step 201.
- This step 201 is a processing step executed by the data acquisition means 21 of FIG.
- step 202 If it is determined that an accident has occurred in step 202 after data is acquired in step 201 (Y), the accident phase is selected in the next step 203, and further, in step 204, the accident phase voltage / phase current data and the transmission line 1 are selected.
- the orientation calculation is performed using preset values such as the line length L and the transmission line line constant Z (vector quantity) per unit length.
- This step 205 is a processing step executed by the orientation result output means 23 of FIG.
- FIG. 4A and 4B are diagrams for explaining the accident location method according to the present embodiment.
- FIG. 4A is a schematic diagram at the time of a power transmission line accident
- FIG. 4B is a voltage distribution of the A and B terminals and the accident point F.
- FIG. 4 and FIG. 4C show relational expressions between the fault point voltage and current, respectively.
- the voltage V A (vector quantity) and current I A (vector quantity), voltage V B (vector quantity) and current I B (vector quantity) during the accident are sampled by the CT 10B.
- the input processing units 10A and 10B take in the voltage V A (vector quantity) and current I A (vector quantity), voltage V B (vector quantity) and current I B (vector quantity) with the data input means 11A and 11B, Convert to digital data.
- the current / voltage data converted into the digital data is stored in the memories of the data storage means 12A and 12B based on the set values such as the data storage time and the accident detection sensitivity.
- Current data V A , I A , V B , and I B are sent to the orientation processing unit 20 via the data transmission means 13A and 13B.
- the data acquisition means 21 captures digital data V A , I A , V B , I B at the time of an accident from each of the input processing units 10A, 10B, and per line length L and unit length of the transmission line 1 Based on a set value such as the transmission line constant Z (vector quantity), the orientation calculation means 22 performs the orientation calculation as follows.
- V B and I B acquired at the B terminal are expressed as complex numbers using an arbitrary phase reference (which can be asynchronous with the A terminal), the following expression (7) is obtained.
- A, B, and C are expressed by the following equation (14). It is.
- the accident phase as viewed from both ends using the data transmitted from the input processing unit installed at each terminal and the set values such as the line constant of the power transmission line to be standardized. Since the calculation of the distance from the predetermined end to the accident point is performed by solving the quadratic equation obtained by taking the point where the square of the magnitude of the accident point voltage is the same as the accident point, Thus, the distance x to the accident point can be obtained with high accuracy by simple and direct calculation without synchronization.
- the block diagram of the accident point locating device for realizing the accident point locating method according to the present embodiment is the same as that of the first embodiment, and the input processing unit 10 is also the same.
- this embodiment differs from the first embodiment in that it is a part of the processing function of the orientation processing unit 20, the different processing functions of the orientation processing unit 20 will be described mainly.
- the voltage V A is applied to the A terminal and the B terminal at both ends of the orientation target line 1 regardless of whether the terminals are synchronized or asynchronous.
- Vector quantity current I A (vector quantity)
- V B vector quantity
- current I B vector quantity
- the line length L and the transmission line constant Z per unit length (vector quantity) are set, and the distance x from the A terminal to the accident point F is obtained using the mode conversion quantity.
- FIG. 5 is a flowchart showing an orientation process 200 executed as a processing function of the orientation processing unit 20 in the accident location system for realizing the accident location method according to the second embodiment of the present invention.
- step 201 data is acquired in step 201.
- This step 201 is a processing step executed by the data acquisition means 21 of FIG.
- step 202 If it is determined in step 202 that an accident has occurred after acquiring the data in step 201 (Y), mode conversion is performed in the next step 203A, and then in step 204 each phase voltage / phase current data and The orientation calculation is performed using setting values such as line constants.
- steps 202, 203A and 204 are processing steps executed by the orientation calculation means 22 of FIG.
- This step 205 is a processing step executed by the orientation result output means 23 of FIG.
- FIG. 6A and 6B are diagrams for explaining an accident point locating method according to the second embodiment of the present invention.
- FIG. 6A is a schematic diagram at the time of a transmission line accident
- FIG. 6B is a voltage of each terminal and the accident point.
- the distribution diagram and FIG. 6C show the relational expressions that hold between the fault point voltage and current, respectively.
- the equations (4) and (8) are expressed by the following equations (16) and (17) in the case of an a-phase accident, In the case of a c-phase accident, it will be expressed by a different formula. Therefore, after performing the accident phase selection process, the distance to the accident point is obtained using an equation corresponding to the selected accident phase.
- equation (21) is obtained.
- equation (23) is obtained.
- mode conversion in the case of normal phase amount, it is 1 phase, 2 phase, 3 phase accident, in the case of reverse phase amount, 1 phase, 2 phase accident, in the case of zero phase amount Applicable to single-phase accidents without accident phase selection.
- the voltage V B (vector quantity) and the current I B (vector quantity) are sampled and the line length L and the transmission line line constant Z (vector quantity) per unit length are used, as in the first embodiment. It is.
- the mode conversion amount is used as described above, and the distance x from the A terminal to the fault point 2 (F) is the fault point voltage [V F ] m (vector quantity) viewed from both ends. ) Is equal in square value, the above equation (25) is obtained. Then, by eliminating the following equation (27) from the equation (25), a quadratic equation relating to x is obtained. And the distance x to an accident point can be calculated
- the distance to the accident point can be calculated by simple and direct calculation without synchronizing each terminal. x can be obtained.
- the mode conversion amount by using the mode conversion amount, there is an advantage that the orientation calculation can be performed without performing the accident phase selection of the a, b, c, ab, bc, ca, and abc phases.
- a normal phase amount it is a 1-phase, 2-phase, or 3-phase accident.
- it can be applied without selecting the accident phase. Therefore, the total amount of calculation can be reduced, and accident point location can be performed more efficiently.
- the block diagram of the accident point locating device for realizing the accident point locating method according to the present embodiment is the same as that of the first and second embodiments, and the input processing unit 10 is also the same.
- this embodiment is different from the first and second embodiments because it is part of the processing function of the orientation processing unit 20, the different processing functions of the orientation processing unit 20 will be described mainly.
- the distance x from the A terminal to the accident point F is calculated as a vector based on preset values such as the line length L and the transmission line line constant Z (vector quantity) per unit length. Determined using the amount (phasor amount).
- FIG. 9 is a flowchart showing an orientation process 200 executed as a processing function of the orientation processing unit 20 in an accident location system for realizing an accident location method according to the third embodiment of the present invention.
- step 201 data is acquired in step 201.
- This step 201 is a processing step executed by the data acquisition means 21 of FIG.
- step 202 If it is determined in step 202 that an accident has occurred (Y) after the data is acquired in step 201, the vector amount (phasor amount) is calculated in the next step 203B.
- the orientation calculation is performed using the set values such as the current data of each phase and the line constant.
- step 204 convergence determination is performed by the orientation calculation means 22 in the following step 2041, and the orientation result is output in the next step 205.
- This step 205 is a processing step executed by the orientation result output means 23 of FIG.
- FIG. 10 to FIG. 12 are diagrams for explaining the accident location method according to the present embodiment.
- FIG. 10A shows an example of time-series sample data of the voltage at the A terminal
- FIG. An example of current sample data is shown
- FIG. 11A shows an example of time-series sample data of the voltage at the B terminal
- FIG. 11B shows an example of sample data of the current at the B terminal
- FIG. 12 shows an example of time-series orientation calculation values.
- V A vector quantity
- current I A vector quantity
- voltage at the A terminal and the B terminal at both ends of the target line 1 regardless of whether each terminal is synchronous or asynchronous.
- Time series sample data of V B (vector quantity) and current I B (vector quantity) are collected.
- the A terminal (FIG. 10) and the B terminal (FIG. 11) are asynchronous and have a phase shift of about 45 degrees.
- the distance x from the A terminal to the fault point 2 (point F) is the fault point voltage V F (vector quantity) seen from both ends. Since the square values of the magnitudes of are equal, the amplitude value and phase of each voltage / current are calculated from the time-series sample data, thereby obtaining an equation (29) described later.
- a method for deriving the formula (29) will be described.
- a method for calculating a vector quantity (phasor quantity) from time series sample data of a certain quantity of electricity there is a method using a discrete Fourier transform (DFT).
- the vector amount (phasor amount) can be calculated by using Equation (28) by using DFT for the time-series sample data V k .
- V As (vector quantity), I As (vector quantity), V Bs (vector quantity), and I Bs (vector quantity) are vector quantities calculated from time-series sample data.
- the distance x to the accident point F can be obtained by solving the quadratic equation of x obtained from Expression (29). As shown in FIG. 12, the orientation calculation values are obtained in time series.
- the time when the calculated orientation value is most stable is determined by convergence judgment, and the final orientation result is obtained.
- the convergence determination there is a method in which the time point at which the three-point variation is minimized is set as the convergence time point.
- the third embodiment similarly to the first embodiment and the second embodiment, it is possible to perform the calculation up to the accident point by simple and direct calculation without synchronizing each terminal.
- the distance x can be determined.
- the final orientation result is output by the convergence determination of the orientation calculation values calculated in time series, so that it is resistant to transient fluctuations and the orientation accuracy can be further improved.
- the block configuration diagram of the accident point locating apparatus for realizing the accident point locating method according to the present embodiment is the same as that of the first to third embodiments, and the input processing unit 10 is also the same.
- the difference of this embodiment from the first to third embodiments is a part of the processing function of the orientation processing unit 20 as shown in FIG. To do.
- the line length L and the transmission line constant Z per unit length are set, and the distance x from the A terminal to the accident point F is set to the amplitude of the vector quantity (phasor quantity). Alternatively, it is determined using the most stable point of the phasor amount.
- FIG. 13 is a flowchart showing an orientation process 200 executed as a processing function of the orientation processing unit 20 in an accident location system for realizing the accident location method according to the fourth embodiment of the present invention.
- step 201 data is acquired in step 201.
- This step 201 is a processing step executed by the data acquisition means 21 of FIG.
- step 202 If it is determined in step 202 that an accident has occurred after acquiring data in step 201 (Y), the vector amount (phasor amount) is calculated in the next step 203B, and the amplitude or phasor is further calculated in the next step 203B1.
- the time point at which the quantity is most stable is determined, and in step 204, the orientation calculation is performed using the set values such as the phase voltage / phase current data at the time point and the line constant.
- This step 205 is a processing step executed by the orientation result output means 23 of FIG.
- FIG. 14 and 15 are diagrams for explaining the accident location method according to the present embodiment.
- FIG. 14 (a) shows an example of time-series sample data of the current at the A terminal
- FIG. 14 (b) shows the current at the A terminal
- FIG. 15A shows an example of time series sample data of the current at the B terminal
- FIG. 15B shows an example of time series amplitude value of the current at the B terminal.
- V A vector quantity
- V B Time-series sample data of the vector amount
- I A vector amount
- I B vector amount
- V AT vector quantity
- I AT vector quantity
- V BT vector quantity
- I BT vector quantity
- the distance x to the accident point at the most stable time of the time-series sample data can be obtained.
- the most stable time point of the time series sample data there is a method such as a time point at which the variation of the three points of the voltage / current amplitude value or the phasor amount of each time series is minimized.
- the A terminal (FIG. 14) and the B terminal (FIG. 15) are asynchronous, and the most stable point of amplitude or phasor amount is shifted by about 2 ms.
- the distance x can be determined.
- the distance x to the accident point is calculated using the value at the most stable time of the amplitude or the phasor amount, so that it is resistant to transient fluctuations, and the orientation accuracy can be further improved.
- the orientation target transmission line 1 has two terminals, but in this embodiment, the orientation target transmission line 1 has three terminals having a branch point, and input processing is performed.
- the configuration of the input processing unit 10 is the same as that of the first embodiment except that the number of units is increased by one. However, some of the processing functions of the orientation processing unit 20 are slightly different because of the branch point.
- CT10C and VT10C are a current transformer and a voltage transformer installed at the C terminal, respectively.
- 10c is an input processing unit provided at the C terminal, and is composed of the data input means 11c, the data storage means 12c and the data transmission means 13c in the same manner as the input processing units 10a and 10b provided at the A terminal and the B terminal. It is connected to a transmission medium NET.
- the orientation processing unit 20 is the same as in the case of FIG.
- the A terminal and the B terminal at both ends of the orientation target line 1 regardless of whether each terminal is synchronous or asynchronous, Voltage V A (vector quantity) and current I A (vector quantity), voltage V B (vector quantity) and current I B (vector quantity) are sampled, respectively.
- the voltage V C (vector quantity) and the current I C (vector quantity) are further sampled at the C terminal.
- step 201 is a processing step executed by the data acquisition means 21 of FIG.
- step 202 If it is determined in step 202 that an accident has occurred after acquiring data in step 201 (Y), branch point voltage / branch point current is calculated in the next step 206, and each phase voltage is calculated in the next step 204.
- the orientation calculation is performed using the set values such as the phase current data and the line constant, and in the subsequent step 207, the fault point is determined or the final section is determined.
- This step 205 is a processing step executed by the orientation result output means 23 of FIG.
- FIG. 18 is a diagram showing an accident point locating method according to the fifth embodiment of the present invention.
- FIG. 18 (a) is a circuit diagram of a transmission line
- FIG. 18 (b) is a relationship established between voltage and current. An expression is shown.
- the power transmission line 1 branches at a branch point D between the terminals A and B and has a terminal C.
- V D vector quantity
- equation (32) By substituting equation (32) into equation (33), a quadratic equation relating to x using the voltage and current at the A terminal, B terminal, and C terminal as parameters is obtained. And the distance x from A terminal to the accident point F can be calculated
- each terminal is synchronized even in a transmission line having three or more terminals having branch points.
- the distance x to the accident point can be obtained with high accuracy by simple and direct calculation.
Abstract
Description
図1は、本発明の第1の実施形態による事故点標定方法を実現するための事故点標定装置のブロック構成図であり、図2および図3はそれぞれ事故点標定装置を構成する入力処理部および標定処理部の処理機能を示すフローチャートである。
本実施形態による事故点標定方法の説明をする前に、まず事故点標定装置の概要について図1ないし図3を参照して説明する。
標定処理部20は、標定処理200において、ステップ201で入力処理部10A、10Bから伝送されてきたデータを取得する。このステップ201は図1のデータ取得手段21によって実行される処理ステップである。
以上で事故点標定装置を構成する入力処理部10A、10Bおよび標定処理部20について機能説明を終えたので、以下、図4を参照して本実施形態による事故点標定方法について説明する。
すなわち、式(1)を2乗すると、次の式(4)が得られる。
本実施形態による事故点標定方法を実現するための事故点標定装置のブロック構成図は第1の実施形態と同様であり、また、入力処理部10についても同一である。
本実施形態においても第1の実施形態と同様、図1の入力処理部10において、標定対象線路1の両端のA端子およびB端子において、各端子の同期、非同期にかかわりなく、それぞれ電圧VA(ベクトル量)および電流IA(ベクトル量)、電圧VB(ベクトル量)および電流IB(ベクトル量)を採取する。
以上で事故点標定装置を構成する入力処理部10A、10Bおよび標定処理部20について機能説明を終えたので、以下、図6を参照して本実施形態による事故点標定方法について説明する。
以下、具体例として、対称座標法の正相量のモード変換を用いる例を次の式(18)、(19)に示す。
なお、以上説明した第2の実施形態では、電圧・電流のモード変換を標定処理部20で行うようにしたが、本実施形態はこれに限定されるものではなく、入力処理部10のデータ記憶手段12にモード変換機能を持たせて、図7で示すように、入力処理部10による入力処理100において、電圧・電流データを記憶する処理ステップ103の後に、データ記憶手段12により電圧・電流のモードを変換するモード変換処理ステップ105を実施するようにしてもよい。この場合、標定処理部20での電圧・電流のモード変換は不要となるので、図8のように標定処理部20による標定処理200からモード変換処理ステップ203Aを削除する。
以上述べたように、第2の実施形態およびその変形例によれば、第1の実施形態と同様に、各端子の同期をとることなく、シンプルかつ直接的な計算により、事故点までの距離xを求めることができる。しかも、本実施形態では、モード変換量を用いることにより、a、b、c、ab、bc、ca、abc相の事故相選別を行うことなく標定計算できる利点がある。例えば、正相量の場合には1相、2相、3相事故に対して、逆相量の場合には1相、2相事故に対して、零相量の場合には1相事故に対して、事故相選別を行うことなく適用できる。そのため、全体の計算量を少なくすることができ、事故点標定をより効率よく行うことができる。
本実施形態による事故点標定方法を実現するための事故点標定装置のブロック構成図は、第1および第2の実施形態と同様であり、また、入力処理部10についても同一である。
本実施形態においても第1、第2の実施形態と同様、図1の入力処理部10においては、標定対象線路1の両端のA端子およびB端子において、各端子の同期、非同期にかかわりなく、それぞれ電圧VA(ベクトル量)および電流IA(ベクトル量)、電圧VB(ベクトル量)および電流IB(ベクトル量)を採取する。
以上で事故点標定装置を構成する入力処理部10A、10Bおよび標定処理部20について機能説明を終えたので、以下、図10ないし図12を参照して本実施形態による事故点標定方法について説明する。
ある電気量の時系列サンプルデータからベクトル量(フェーザ量)を算出する一般例の一つとして、離散フーリエ変換(DFT)を用いる方法がある。
ベクトル量(フェーザ量)は、時系列サンプルデータVkに対して、DFTを用いることより、式(28)にて算出できる。
本実施形態による事故点標定方法を実現するための事故点標定装置のブロック構成図は、第1ないし第3の実施形態と同様であり、また、入力処理部10についても同一である。
本実施形態においても第1ないし第3の実施形態と同様、図1の入力処理部10において、標定対象線路1の両端のA端子およびB端子において、各端子の同期、非同期にかかわりなく、それぞれ電圧VA(ベクトル量)および電流IA(ベクトル量)、電圧VB(ベクトル量)および電流IB(ベクトル量)を採取する。
以上で事故点標定装置を構成する入力処理部10A、10Bおよび標定処理部20について機能説明を終えたので、以下、図14および図15の波形図を参照して本実施形態による事故点標定方法について説明する。
以上述べた第1ないし第4の実施形態の場合、標定対象送電線1が2端子の場合であったが、本実施形態は標定対象送電線1が分岐点を有する3端子であり、入力処理部が一つ増えた点を除けば、入力処理部10の構成は第1の実施形態と同じである。しかし、分岐点があるがゆえに標定処理部20の処理機能の一部が少し異なる。
図17において、ステップ201でデータを取得する。このステップ201は図1のデータ取得手段21によって実行される処理ステップである。
以上で事故点標定装置を構成する入力処理部10A、10Bおよび標定処理部20について機能説明を終えたので、以下、図18を参照して本実施形態による事故点標定方法について説明する。
Claims (6)
- 標定対象送電線の各端子の電圧、電流および送電線線路定数を用いて事故点を標定する事故点標定方法において、
両端から見た事故相の事故点電圧の大きさの2乗値が等しい点を事故点として得られる2次方程式を解くことにより所定の一端から事故点までの距離を算出することを特徴とする事故点標定方法。 - 前記事故点電圧としてモード変換した値を用いることを特徴とする請求項1に記載の事故点標定方法。
- 前記電圧、電流の時系列サンプル値を用いて計算し、時系列的に算出した標定結果の収束判定を行うことにより最終結果を出力することを特徴とする請求項1に記載の事故点標定方法。
- 前記電圧、電流の時系列サンプル値を用いて計算し、時系列サンプル値の最も安定した時点のデータを用いて計算することを特徴とする請求項1に記載の事故点標定方法。
- 分岐点を有する3端子以上の送電線において、2端子から見た分岐点電圧が等しいことを利用し、2端子の電圧、電流および送電線線路定数を用いて2端子間の位相差を算出し、算出した位相差と2端子の電圧・電流および送電線線路定数を用いて分岐点の電圧・電流を算出し、端子と分岐点間または分岐点と分岐点間を前記両端とみなして、所定の一端から事故店までの距離を算出することを特徴とする請求項1に記載の事故点標定方法。
- 標定対象送電線の各端子の電圧、電流および送電線線路定数を用いて事故点を標定する事故点標定装置において、
標定対象送電線の各端子に、端子電圧および電流を取り込み、ディジタル変換を行うデータ入力手段、データ記憶時間を含む1種以上の設定値を予め設定しておき、この設定値をもとに事故発生時に電気量データをメモリに記憶するデータ記憶手段、記憶したデータを伝送するデータ伝送手段を備えた入力処理部を設け、
伝送媒体を介して前記各端子に設置された前記入力処理部から伝送されてくるデータを取得するデータ取得手段、前記標定対象送電線の線路定数を含む1種以上の設定値を予め設定しておき、この設定値および前記データ取得手段で取得した電流、電圧データを用い、両端から見た事故相の事故点電圧の大きさの2乗値が等しい点を事故点として得られる2次方程式を解くことにより所定の一端から事故点までの距離を算出する標定演算を行う標定演算手段、この標定演算手段の標定結果を出力する標定結果出力手段を備えた標定処理部を設けたことを特徴とする事故点標定装置。
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JP2018163066A (ja) * | 2017-03-27 | 2018-10-18 | 三菱電機株式会社 | 故障点標定装置 |
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JP2011033588A (ja) * | 2009-08-05 | 2011-02-17 | Toshiba Corp | 事故点標定方法およびそのシステム |
CN103105563B (zh) * | 2013-01-28 | 2016-01-20 | 山东电力集团公司济宁供电公司 | 一种电力线路故障行波网络定位方法 |
EP2884291B1 (en) * | 2013-12-11 | 2019-08-21 | ABB Schweiz AG | Fault location in electrical network |
JP6459518B2 (ja) * | 2014-02-04 | 2019-01-30 | 東京電力ホールディングス株式会社 | 事故点標定装置 |
US11150290B2 (en) | 2018-08-23 | 2021-10-19 | Schweitzer Engineering Laboratories, Inc. | Accurate fault location method based on local and remote voltages and currents |
US10656197B2 (en) | 2018-08-23 | 2020-05-19 | Schweitzer Engineering Laboratories, Inc. | Accurate fault location method based on local measurements and remote currents |
CN113721106B (zh) * | 2020-05-26 | 2023-07-14 | 广东电网有限责任公司电力科学研究院 | 配电网故障定位方法、装置及设备 |
CN113191062B (zh) * | 2021-04-13 | 2024-01-09 | 云南电网有限责任公司昆明供电局 | 基于多源不完整信息的配电网故障区段定位方法及系统 |
CN114184884A (zh) * | 2021-11-23 | 2022-03-15 | 昆明理工大学 | 一种电网故障行波测距方程自动构造方法 |
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