WO2013026276A1 - Method for locating single-phase grounding fault of generator stator winding - Google Patents

Method for locating single-phase grounding fault of generator stator winding Download PDF

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WO2013026276A1
WO2013026276A1 PCT/CN2012/073788 CN2012073788W WO2013026276A1 WO 2013026276 A1 WO2013026276 A1 WO 2013026276A1 CN 2012073788 W CN2012073788 W CN 2012073788W WO 2013026276 A1 WO2013026276 A1 WO 2013026276A1
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phase
voltage
generator
ground fault
grounding
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PCT/CN2012/073788
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French (fr)
Chinese (zh)
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陈俊
严伟
沈全荣
张琦雪
王光
李华忠
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南京南瑞继保电气有限公司
南京南瑞继保工程技术有限公司
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Publication of WO2013026276A1 publication Critical patent/WO2013026276A1/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
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • 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
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

Definitions

  • the present invention relates to the field of power systems, and in particular, to a single-phase ground fault location method for a generator stator winding and a corresponding relay protection device or monitoring device. Background technique
  • Fault location of the generator stator winding single-phase ground fault is beneficial to early detection and troubleshooting.
  • the generator stator grounding protection for field applications does not have fault location.
  • the main object of the present invention is to provide a single-phase grounding fault locating method for a generator stator winding, which does not need the injection type stator grounding protection, and only needs the three-phase voltage of the generator to calculate the fault location, and the operation is simple and the efficiency is high. Facilitate on-site troubleshooting.
  • a method for locating single-phase ground fault of generator stator winding includes the following steps:
  • the position of the stator single-phase ground fault is obtained according to the ground transition resistance value of the stator single-phase ground fault phase, the self-produced zero-sequence voltage and the fault phase electromotive force, and the equation of the ground fault position is: " «.
  • the generator neutral point zero-sequence voltage amplitude it can be replaced by the three-phase self-produced zero-sequence voltage amplitude;
  • E x is the fault phase electromotive force, calculated by the rated phase voltage of the generator;
  • ⁇ ⁇ is the generator neutral point grounding transformer secondary load resistance converted to the primary side of the resistance value; r f is the fault phase stator grounding transition resistance value;
  • x c is the capacitive reactance of the total capacitance of the stator three relative to ground.
  • the three-phase voltages are respectively ⁇ , U C , and the self-produced zero-sequence voltage ⁇ .
  • the full-cycle Fourier algorithm is used to obtain the fundamental amplitude of the three-phase voltage and the self-produced zero-sequence voltage.
  • the invention determines the ground fault phase according to the lowest voltage phase by detecting the three-phase voltage of the generator end, and then expresses the three-phase voltage by the electromotive force of the fault phase, by comparing the square difference of the three-phase voltage, thereby obtaining The stator winding ground fault transition resistance value and the ground fault location are obtained.
  • the invention does not need the aid of the injection type stator grounding protection, and the single-phase ground fault position of the generator stator winding can be calculated from the three-phase voltage of the generator, which is convenient for on-site fault investigation and has wide application value.
  • FIG. 1 is a schematic view showing a ground fault of a stator winding A through a transition resistance in the present invention
  • Rw is the secondary load resistance of the generator neutral point grounding transformer converted to the primary side resistance value
  • r f is the stator grounding transition resistance value
  • C g ⁇ is the generator stator to ground capacitance value
  • t ⁇ is the generator neutral point zero sequence voltage
  • a is the stator ground fault position value (expressed as a percentage, the number of turns from the fault point to the neutral point as a percentage of the total number of turns in one phase)
  • 4 are generators respectively The electromotive force of the three phases of the stators A, B and C
  • Figure 2 shows the three-phase voltage waveform of the terminal when the single phase of the A phase of a 700MW hydropower unit is faulty;
  • Figure 3 shows the value calculated by equation (9) for a phase-to-phase single-phase fault of a 700 MW hydropower unit
  • Figure 4 shows the transition resistance calculated by equation (10) for a phase A single phase fault of a 700 MW hydropower unit.
  • Figure 5 shows the grounding of the stator calculated by equation (11) for a phase A single phase fault of a 700 MW hydropower unit. Fault location alpha value.
  • the present invention provides a single-phase ground fault location method for a generator stator winding, which includes the following steps:
  • stator winding A phase is the ground fault phase, which is grounded via the transition resistor, the grounding transition resistance will be solved below.
  • Equation (7) is divided by equation (8) to obtain: Then the grounding transition resistance ⁇ is:
  • Stator winding B phase grounding and C phase grounding grounding resistance and grounding position solving process is similar to A phase grounding, and will not be described again.
  • the total capacitive capacity XC of the stator three of a 700MW unit of a hydropower plant is 293.82 ⁇ .
  • the grounding resistance value RN of the generator neutral point is 295.07 ⁇ , the rated phase voltage is 57.2V, and a phase A transition resistance is generated.
  • the stator grounding protection operates correctly and the voltage waveform at the time of the fault is recorded.
  • the three-phase voltage waveform during the protection action is shown in Fig. 2.
  • the solid line waveform is the voltage original waveform, the broken line is the voltage amplitude, and the A phase voltage amplitude is the lowest. Therefore, it can be judged that the fault phase is the A phase.
  • the value can be obtained from equation (9), as shown in Figure 3.
  • ⁇ and X c are substituted into equation ( 10) to obtain the single-phase grounding transition resistance value ⁇ , as shown in Fig. 4.
  • Substituting r into equation (11) can determine the single-phase ground fault location. As shown in Figure 5, the ground fault location is between 23% and 26.5%.
  • the grounding position estimated based on the on-site fault point investigation is about 26% from the neutral point, which is basically consistent with the calculation result in Figure 5.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

Disclosed is a method for locating a single-phase grounding fault of a generator stator winding, including the following steps: (1) collecting three-phase voltages of a generator terminal voltage inductor of a generator to derive a self-produced zero sequence voltage; (2) calculating the fundamental wave amplitude of the three-phase voltages and self-produced zero sequence voltage and comparing the magnitude of the three-phase voltages, wherein one phase with the lowest voltage is the grounding fault phase; and (3) calculating the grounding transit resistance of the grounding fault phase to obtain a location relationship with a neutral point at the grounding fault place, so as to determine the grounding fault location. The locating method does not need injected stator grounding protection but only needs generator three-phase voltages to calculate and obtain the fault location, which is simple to operate, highly efficient and convenient for on-site troubleshooting.

Description

一种发电机定子绕组单相接地故障定位方法 技术领域 本发明属于电力***领域， 特别涉及一种发电机定子绕组单相接地故障定位方法和 相应的继电保护装置或监测装置。 背景技术  TECHNICAL FIELD The present invention relates to the field of power systems, and in particular, to a single-phase ground fault location method for a generator stator winding and a corresponding relay protection device or monitoring device. Background technique
对发电机定子绕组单相接地故障进行故障定位， 有利于尽早发现和排除故障。然而， 目前， 现场应用的发电机定子接地保护还不具备故障定位功能。  Fault location of the generator stator winding single-phase ground fault is beneficial to early detection and troubleshooting. However, at present, the generator stator grounding protection for field applications does not have fault location.
近年来， 国内同行提出了利用注入式定子接地保护测量出接地过渡电阻值， 再结合 中性点零序电压进行接地故障定位的方法。 该方法需要专门配置注入式定子接地保护及 其辅助设备， 而现场装设注入式定子接地保护的机组并不多， 因此， 目前还难以推广应 用。  In recent years, domestic counterparts have proposed a ground fault resistance value by using the injected stator grounding protection to measure the grounding transition resistance value, and then combined with the neutral point zero sequence voltage for ground fault location. This method requires special configuration of the injected stator grounding protection and its auxiliary equipment, and there are not many units equipped with injecting stator grounding protection on site, so it is difficult to promote the application at present.
针对以上现状， 本发明人对定子故障判断定位方法进行研究改进， 本案由此产生。 发明内容  In view of the above situation, the inventors have made research and improvement on the method of determining and locating the stator fault, and the present invention is produced. Summary of the invention
本发明的主要目的， 在于提供一种发电机定子绕组单相接地故障定位方法， 其无需 借助注入式定子接地保护， 仅需发电机三相电压即可计算得到故障位置， 操作简单， 效 率高， 便于现场故障排查。  The main object of the present invention is to provide a single-phase grounding fault locating method for a generator stator winding, which does not need the injection type stator grounding protection, and only needs the three-phase voltage of the generator to calculate the fault location, and the operation is simple and the efficiency is high. Facilitate on-site troubleshooting.
为了达成上述目的， 本发明所采用的技术方案是：  In order to achieve the above object, the technical solution adopted by the present invention is:
一种发电机定子绕组单相接地故障定位方法， 包括如下步骤：  A method for locating single-phase ground fault of generator stator winding includes the following steps:
( 1 ) 采集发电机机端电压互感器三相电压， 求得自产零序电压；  (1) Collecting the three-phase voltage of the generator terminal voltage transformer, and obtaining the self-produced zero-sequence voltage;
(2)计算前述三相电压和自产零序电压的基波幅值， 比较三相电压的大小， 其中电 压最低的一相即为接地故障相；  (2) Calculate the amplitude of the fundamental wave of the aforementioned three-phase voltage and the self-produced zero-sequence voltage, and compare the magnitude of the three-phase voltage, wherein the lowest phase of the voltage is the ground fault phase;
( 3 )计算前述接地故障相的接地过渡电阻值，得到接地故障处与中性点的位置关系， 从而确定接地故障位置。  (3) Calculate the grounding transition resistance value of the ground fault phase, and obtain the positional relationship between the ground fault and the neutral point to determine the ground fault location.
上述步骤（3 ) 中， 根据定子单相接地故障相的接地过渡电阻值、 机端自产零序电压 和故障相电动势求得定子单相接地故障的位置， 所述接地故障位置的方程为：
Figure imgf000003_0001
"«。为发电机中性点零序电压幅值， 可取三相自产零序电压幅值替代； Ex为故障相电动势， 以发电机的额定相电压计算； In the above step (3), the position of the stator single-phase ground fault is obtained according to the ground transition resistance value of the stator single-phase ground fault phase, the self-produced zero-sequence voltage and the fault phase electromotive force, and the equation of the ground fault position is:
Figure imgf000003_0001
"«. For the generator neutral point zero-sequence voltage amplitude, it can be replaced by the three-phase self-produced zero-sequence voltage amplitude; E x is the fault phase electromotive force, calculated by the rated phase voltage of the generator;
^ ^即发电机中性点接地变压器二次负载电阻折算到一次侧的电阻值； rf为故障相定子接地过渡电阻值； ^ ^ is the generator neutral point grounding transformer secondary load resistance converted to the primary side of the resistance value; r f is the fault phase stator grounding transition resistance value;
xc为定子三相对地总电容的容抗。 上述步骤 （1 ) 中， 设三相电压分别为 Α、 UC , 则自产零序电压^。的表达式 x c is the capacitive reactance of the total capacitance of the stator three relative to ground. In the above step (1), the three-phase voltages are respectively Α, U C , and the self-produced zero-sequence voltage ^. Expression
上述步骤 （2) 中， 利用全周傅里叶算法求得三相电压和自产零序电压的基波幅值。 采用上述方案后， 本发明通过检测发电机机端三相电压， 根据最低电压相确定接地 故障相， 然后将三相电压均用故障相的电动势表示， 通过比较三相电压的平方差， 从而 求得定子绕组接地故障过渡电阻值和接地故障位置。 本发明无需借助注入式定子接地保 护， 由发电机三相电压即可计算出发电机定子绕组单相接地故障位置， 便于现场故障排 查， 具有广泛的推广应用价值。 In the above step (2), the full-cycle Fourier algorithm is used to obtain the fundamental amplitude of the three-phase voltage and the self-produced zero-sequence voltage. After adopting the above scheme, the invention determines the ground fault phase according to the lowest voltage phase by detecting the three-phase voltage of the generator end, and then expresses the three-phase voltage by the electromotive force of the fault phase, by comparing the square difference of the three-phase voltage, thereby obtaining The stator winding ground fault transition resistance value and the ground fault location are obtained. The invention does not need the aid of the injection type stator grounding protection, and the single-phase ground fault position of the generator stator winding can be calculated from the three-phase voltage of the generator, which is convenient for on-site fault investigation and has wide application value.
附图说明 DRAWINGS
图 1是本发明中以定子绕组 A相经过渡电阻接地故障示意图；  1 is a schematic view showing a ground fault of a stator winding A through a transition resistance in the present invention;
Rw为发电机中性点接地变压器二次负载电阻折算到一次侧的电阻值， rf 为定子接地 过渡电阻值， Cg∑为发电机定子对地电容值， t ^。为发电机中性点零序电压， a为定子接 地故障位置值 （以百分比表示， 为故障点到中性点的匝数占一相串联总匝数的百分比）， 、 和 4分别为发电机定子 A、 B、 C三相的电动势； 图 2为某 700MW水电机组 A相单相接地故障时的机端三相电压波形； Rw is the secondary load resistance of the generator neutral point grounding transformer converted to the primary side resistance value, r f is the stator grounding transition resistance value, C g ∑ is the generator stator to ground capacitance value, t ^. For the generator neutral point zero sequence voltage, a is the stator ground fault position value (expressed as a percentage, the number of turns from the fault point to the neutral point as a percentage of the total number of turns in one phase), and 4 are generators respectively The electromotive force of the three phases of the stators A, B and C; Figure 2 shows the three-phase voltage waveform of the terminal when the single phase of the A phase of a 700MW hydropower unit is faulty;
图 3为某 700MW水电机组 A相单相接地故障时， 式 （9) 计算的 值；  Figure 3 shows the value calculated by equation (9) for a phase-to-phase single-phase fault of a 700 MW hydropower unit;
图 4为某 700MW水电机组 A相单相接地故障时， 式 （10) 计算的过渡电阻/>值； 图 5为某 700MW水电机组 A相单相接地故障时， 式 （11 ) 计算的定子接地故障位 置 α值。 具体实施方式 Figure 4 shows the transition resistance calculated by equation (10) for a phase A single phase fault of a 700 MW hydropower unit. Figure 5 shows the grounding of the stator calculated by equation (11) for a phase A single phase fault of a 700 MW hydropower unit. Fault location alpha value. detailed description
以下将结合附图对本发明的技术方案进行详细说明。  The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
如图 1所示， 本发明提供一种发电机定子绕组单相接地故障定位方法， 包括如下步 骤：  As shown in FIG. 1, the present invention provides a single-phase ground fault location method for a generator stator winding, which includes the following steps:
( 1 ) 采集发电机机端电压互感器三相电压^^、 ^ ^和 利用下式求得自产零序 电压 。： (1) Collect the three-phase voltage of the generator terminal voltage transformer ^^, ^ ^ and use the following formula to obtain the self-produced zero-sequence voltage. :
3 ( 1 ) 3 ( 1 )
(2) 采用全周傅立叶算法求得前述三相电压 ^^、 和自产零序电压^7。的基 波幅值， 比较三相电压的大小， 由于发电机中性点一次接地电阻值 （接地变压器二次负 载电阻折算到一次侧的电阻）小于等于三相对地总容抗值， 因此当定子单相接地故障时， 故障相的电压最低， 由此可判断出接地故障相； (2) Using the full-circle Fourier algorithm to obtain the aforementioned three-phase voltage ^^, and the self-produced zero-sequence voltage ^ 7 . The fundamental amplitude, compare the magnitude of the three-phase voltage, because the generator neutral point primary grounding resistance value (the grounding transformer secondary load resistance is converted to the primary side resistance) is less than or equal to three relative ground capacitance values, so when the stator In the case of a single-phase earth fault, the voltage of the fault phase is the lowest, thereby determining the ground fault phase;
(3) 假设定子绕组 A相为接地故障相， 其经过渡电阻 接地， 则以下将求解接地 过渡电阻。 (3) Assuming that the stator winding A phase is the ground fault phase, which is grounded via the transition resistor, the grounding transition resistance will be solved below.
由图 1可得： = 0 (2)
Figure imgf000005_0001
其中， J ^为发电机中性点接地变压器二次负载电阻折算到一次侧的电阻值， 为定 子接地过渡电阻值， ∑为发电机定子对地电容值， ^ ^。为发电机中性点零序电压， "为 定子接地故障位置值 （以百分比表示， 为故障点到中性点的匝数占一相串联总匝数的百 分比）， E 和 分别为发电机定子八、 B、 C三相的电动势。 ^ Xc =—^—, 则由式 （2) 可得： From Figure 1, you can get: = 0 (2)
Figure imgf000005_0001
Wherein, J ^ is the resistance value of the generator secondary grounding transformer secondary load resistance converted to the primary side, which is the stator grounding transition resistance value, and ∑ is the generator stator to ground capacitance value, ^ ^. For the generator neutral point zero-sequence voltage, "for the stator ground fault position value (expressed as a percentage, the number of turns from the fault point to the neutral point as a percentage of the total number of turns in one phase), E and generator stator respectively Eight, B, C three-phase electromotive force. ^ X c = -^—, then from equation (2):
Figure imgf000005_0002
其中， 为定子三相对地总电容的容抗( 令 A
Figure imgf000006_0001
Figure imgf000006_0005
将机端三相电压用故障相 （A相） 电动势 表示， 则机端三相电压为:
Figure imgf000005_0002
Where is the capacitive reactance of the total capacitance of the stator three relative to the ground ( A
Figure imgf000006_0001
Figure imgf000006_0005
The three-phase voltage of the terminal is represented by the fault phase (phase A) electromotive force, and the three-phase voltage of the terminal is:
ag卜 | + C„。 I = | I · [(1 + A2 + S2 )— 2A] (4)
Figure imgf000006_0002
其中， uag、 和" 分别为发电机机端 A、 B、 C三相电压 a g卜| + C„. I = | I · [(1 + A 2 + S 2 )— 2A] (4)
Figure imgf000006_0002
Where u ag , and " respectively are the generator terminals A , B , C three-phase voltage
计算三相电压两两平方差: Calculate the squared difference between the three phases of voltage:
Figure imgf000006_0006
Figure imgf000006_0006
Figure imgf000006_0007
Figure imgf000006_0007
令 kOrder k
Figure imgf000006_0003
式 （7) 与式 （8)相除， 得:
Figure imgf000006_0004
则接地过渡电阻 ^为:
Figure imgf000006_0003
Equation (7) is divided by equation (8) to obtain:
Figure imgf000006_0004
Then the grounding transition resistance ^ is:
Figure imgf000007_0001
Figure imgf000007_0001
(4)将接地过渡电阻值 rf (也即式 （10) 的表达式）代入式 （3)， 可得接地故障位 置 α： (4) Substituting the grounding transition resistance value r f (that is, the expression of the equation (10)) into the equation (3), the ground fault position α can be obtained:
( 11 )
Figure imgf000007_0002
Figure imgf000007_0003
其中， 。为发电机中性点零序电压幅值， 可取式 （1 ) 计算的三相自产零序电压幅 值替代， 为 Α相电动势， 以发电机的额定相电压计算。 (11)
Figure imgf000007_0002
Figure imgf000007_0003
among them, . For the zero-sequence voltage amplitude of the generator neutral point, the three-phase self-produced zero-sequence voltage amplitude calculated by equation (1) can be substituted, which is the pseudo-phase electromotive force, calculated by the rated phase voltage of the generator.
定子绕组 B相接地和 C相接地时的接地电阻和接地位置求解过程与 A相接地类似， 不再赘述。  Stator winding B phase grounding and C phase grounding grounding resistance and grounding position solving process is similar to A phase grounding, and will not be described again.
以下将结合某电厂一台 700MW水轮发电机的具体定子接地故障情况， 说明本发明 的具体实施方式。  The specific embodiment of the present invention will be described below in connection with a specific stator ground fault condition of a 700 MW hydro-generator of a power plant.
某水电厂 700MW机组定子三相对地总容抗 XC为 293.82 Ω，发电机中性点折算到一 次的接地电阻值 RN为 295.07 Ω， 额定相电压为 57.2V, 发生了一次 A相经过渡电阻单 相接地故障， 定子接地保护正确动作并且记录下了故障时的电压波形。  The total capacitive capacity XC of the stator three of a 700MW unit of a hydropower plant is 293.82 Ω. The grounding resistance value RN of the generator neutral point is 295.07 Ω, the rated phase voltage is 57.2V, and a phase A transition resistance is generated. In the case of a phase-to-earth fault, the stator grounding protection operates correctly and the voltage waveform at the time of the fault is recorded.
保护动作时的三相电压波形如图 2所示， 实线波形为电压原始波形， 虚线为电压幅 值， A相电压幅值最低， 因此， 可以判断故障相为 A相。 由式 （9) 可求得 值， 如图 3所示。 再将 、 ^和 Xc一起代入式 （10 ) 即可求得单相接地过渡电阻值 ^， 如图 4所示。 将 r代入式 （11 ) 即可求得单相接地故障位置"， 如图 5所示， 接地故障位置约为 23%~26.5%之间。 The three-phase voltage waveform during the protection action is shown in Fig. 2. The solid line waveform is the voltage original waveform, the broken line is the voltage amplitude, and the A phase voltage amplitude is the lowest. Therefore, it can be judged that the fault phase is the A phase. The value can be obtained from equation (9), as shown in Figure 3. Then, ^ and X c are substituted into equation ( 10) to obtain the single-phase grounding transition resistance value ^, as shown in Fig. 4. Substituting r into equation (11) can determine the single-phase ground fault location. As shown in Figure 5, the ground fault location is between 23% and 26.5%.
根据现场故障点排查情况大致估算的接地位置为距中性点 26%左右的位置， 与图 5 的计算结果基本吻合。  The grounding position estimated based on the on-site fault point investigation is about 26% from the neutral point, which is basically consistent with the calculation result in Figure 5.
以上实施例仅为说明本发明的技术思想， 不能以此限定本发明的保护范围， 凡是按 照本发明提出的技术思想， 在技术方案基础上所做的任何改动， 均落入本发明保护范围 之内。 The above embodiments are merely illustrative of the technical idea of the present invention, and the scope of protection of the present invention cannot be limited thereto. Any changes made on the basis of the technical solutions according to the technical idea proposed by the present invention fall within the protection scope of the present invention.

Claims

权利要求书 Claim
1、 一种发电机定子绕组单相接地故障定位方法， 其特征在于包括如下步骤： A method for locating a stator single-phase ground fault of a generator stator winding, comprising the steps of:
( 1 ) 采集发电机机端电压互感器三相电压， 求得自产零序电压； (1) Collecting the three-phase voltage of the generator terminal voltage transformer, and obtaining the self-produced zero-sequence voltage;
( 2 ) 计算前述三相电压和自产零序电压的基波幅值， 比较三相电压的大小， 其中电 压最低的一相即为接地故障相；  (2) Calculate the amplitude of the fundamental wave of the aforementioned three-phase voltage and the self-produced zero-sequence voltage, and compare the magnitude of the three-phase voltage, wherein the lowest phase of the voltage is the ground fault phase;
( 3 ) 计算前述接地故障相的接地过渡电阻值， 得到接地故障处与中性点的位置关 系， 从而确定接地故障位置。  (3) Calculate the grounding transition resistance value of the ground fault phase, and obtain the positional relationship between the ground fault and the neutral point to determine the ground fault location.
2、 如权利要求 1 所述的一种发电机定子绕组单相接地故障定位方法， 其特征在于： 所述步骤 （3 ) 中， 根据定子单相接地故障相的接地过渡电阻值、 机端自产零序电压和故 障相电动势求得定子单相接地故障的位置， 所述接地故障位置的方程为：  2. The method for locating a single-phase ground fault of a stator winding of a generator according to claim 1, wherein: in the step (3), the grounding resistance value according to the stator single-phase ground fault phase, the machine end The zero-sequence voltage and the fault-phase electromotive force are obtained to obtain the position of the stator single-phase ground fault, and the equation of the ground fault position is:
■ + 1 ■ + 1
R,
Figure imgf000009_0001
R,
Figure imgf000009_0001
" «。为发电机中性点零序电压幅值， 可取三相自产零序电压幅值替代； "«. For the generator neutral point zero-sequence voltage amplitude, it can be replaced by the three-phase self-produced zero-sequence voltage amplitude;
Ex为故障相电动势， 以发电机的额定相电压计算； E x is the fault phase electromotive force, calculated by the rated phase voltage of the generator;
^ ^即发电机中性点接地变压器二次负载电阻折算到一次侧的电阻值； rf 为故障相定子接地过渡电阻值； ^ ^ is the generator neutral point grounding transformer secondary load resistance converted to the primary side of the resistance value; rf is the fault phase stator grounding transition resistance value;
xc为定子三相对地总电容的容抗。 x c is the capacitive reactance of the total capacitance of the stator three relative to ground.
3、 如权利要求 1 所述的一种发电机定子绕组单相接地故障定位方法， 其特征在于： 所述步骤 （1 ) 中， 设三相电压分别为 ^ ύ Uc , 则自产零序电压^7。的表达式为 ϋ Δ + ύκ +ύ 3. The method for locating a single-phase ground fault of a stator winding of a generator according to claim 1, wherein: in the step (1), the three-phase voltage is respectively ^ ύ U c , and the self-produced zero sequence Voltage ^ 7 . The expression is ϋ Δ + ύ κ +ύ
υ υ
3  3
4、 如权利要求 1 所述的一种发电机定子绕组单相接地故障定位方法， 其特征在于: 所述步骤 （2) 中， 利用全周傅里叶算法求得三相电压和自产零序电压的基波幅值。 4. The method for locating a single-phase ground fault of a stator winding of a generator according to claim 1, wherein: in the step (2), obtaining a three-phase voltage and a self-produced zero by using a full-circle Fourier algorithm. The fundamental amplitude of the sequence voltage.
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