CN103545798A - A Distance Protection Method for Fail-Open Components in Oscillating Blocking - Google Patents

A Distance Protection Method for Fail-Open Components in Oscillating Blocking Download PDF

Info

Publication number
CN103545798A
CN103545798A CN201310492175.4A CN201310492175A CN103545798A CN 103545798 A CN103545798 A CN 103545798A CN 201310492175 A CN201310492175 A CN 201310492175A CN 103545798 A CN103545798 A CN 103545798A
Authority
CN
China
Prior art keywords
distance protection
protection
distance
open
meet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201310492175.4A
Other languages
Chinese (zh)
Other versions
CN103545798B (en
Inventor
王兴国
杜丁香
周泽昕
李仲青
李伟
李肖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Original Assignee
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, China Electric Power Research Institute Co Ltd CEPRI filed Critical State Grid Corp of China SGCC
Priority to CN201310492175.4A priority Critical patent/CN103545798B/en
Publication of CN103545798A publication Critical patent/CN103545798A/en
Application granted granted Critical
Publication of CN103545798B publication Critical patent/CN103545798B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

本发明涉及一种振荡闭锁中故障开放元件的距离保护方法,包括下述步骤:采集保护安装处三相电流和三相电压;判断是否进入振荡闭锁状态;若

Figure DDA0000398179000000011
Figure DDA0000398179000000012
转至倒数第二步,否则,转至下一步;若电流不对称度m≥0.65,开放距离保护;否则,转至下一步;若振荡中心电压
Figure DDA0000398179000000013
中任一满足延时200ms开放距离保护I段,瞬时开放距离保护II段;否则,转至下一步;若
Figure DDA0000398179000000015
中任一满足
Figure DDA0000398179000000016
延时200ms开放距离保护I段,瞬时开放距离保护II段;否则,闭锁距离保护;若中任一满足时,延时150ms开放距离保护;否则,转至下一步;若
Figure DDA0000398179000000019
中任一满足
Figure DDA00003981790000000110
时,延时150ms开放距离保护;否则,闭锁距离保护。该方法提高振荡闭锁中故障开放元件的灵敏度,使距离保护在经较大过渡电阻故障时能够正确动作。

Figure 201310492175

The invention relates to a distance protection method for a fault-opening element in oscillation locking, comprising the following steps: collecting three-phase current and three-phase voltage at the installation place of the protection; judging whether to enter the oscillation locking state; if

Figure DDA0000398179000000011
and
Figure DDA0000398179000000012
Go to the penultimate step, otherwise, go to the next step; if the current asymmetry m≥0.65, open the distance protection; otherwise, go to the next step; if the oscillation center voltage
Figure DDA0000398179000000013
Either one satisfies Delay 200ms to open the distance protection section I, and open the distance protection section II instantaneously; otherwise, go to the next step; if
Figure DDA0000398179000000015
Either one satisfies
Figure DDA0000398179000000016
Delay 200ms to open distance protection stage I, and instantaneously open distance protection stage II; otherwise, block distance protection; if Either one satisfies , open the distance protection with a delay of 150ms; otherwise, go to the next step; if
Figure DDA0000398179000000019
Either one satisfies
Figure DDA00003981790000000110
, delay 150ms to open the distance protection; otherwise, block the distance protection. The method improves the sensitivity of the fault-opening element in the oscillation blocking, so that the distance protection can operate correctly when the fault passes through a relatively large transition resistance.

Figure 201310492175

Description

一种振荡闭锁中故障开放元件的距离保护方法A Distance Protection Method for Fail-Open Components in Oscillating Blocking

技术领域technical field

本发明涉及电力系统继电保护领域的保护方法,具体涉及一种振荡闭锁中故障开放元件的距离保护方法。The invention relates to a protection method in the field of relay protection of electric power systems, in particular to a distance protection method for fault open components in oscillation blocking.

背景技术Background technique

距离保护作为输电线路、变压器的后备保护被广泛用于不同电压等级电力系统中。Distance protection is widely used in power systems of different voltage levels as backup protection of transmission lines and transformers.

电力系统发生振荡时,测量阻抗周期性变化,距离保护存在误动的可能,对于距离保护I、II段,由于动作时间较短,微机保护装置采取振荡闭锁元件防止距离保护I、II段在振荡过程中误动作,对于距离保护III段,由于动作时间较长,依靠动作延时躲过振荡,对于振荡闭锁过程中又发生故障,利用振荡闭锁中的故障开放元件开放距离保护I、II段,故障开放元件分为不对称故障开放元件和对称故障开放元件。When the power system oscillates, the measurement impedance changes periodically, and there is a possibility of misoperation of the distance protection. For the distance protection sections I and II, due to the short action time, the microcomputer protection device adopts an oscillation blocking element to prevent the distance protection sections I and II from oscillating. Malfunction during the process, for the distance protection section III, because the action time is long, rely on the action delay to avoid the oscillation, if a fault occurs during the oscillation blocking process, use the fault open element in the oscillation blocking to open the distance protection sections I and II, Fail-open elements are divided into asymmetric fail-open elements and symmetric fail-open elements.

常用电流不对称度m作为不对称故障开放元件,利用振荡中心电压

Figure BDA0000398178980000011
作为对称故障开放元件。对于不对称故障开放元件,当线路处于重负荷运行时,发生经大过渡电阻接地故障时,电流不对称度m不满足条件,无法开放距离保护,造成保护无法正确动作。对于对称故障开放元件,振荡中心电压
Figure BDA0000398178980000012
一般采取两段式,二者之间存在重叠动作区,开放时间不一致,当发生三相经过渡电阻短路时,开放时间较长,影响保护的快速性。The current asymmetry m is commonly used as an asymmetric fault opening element, and the oscillation center voltage is used
Figure BDA0000398178980000011
As a symmetrical fail-open element. For asymmetric fault open components, when the line is under heavy load operation, when a ground fault occurs through a large transition resistance, the current asymmetry m does not meet the conditions, and the distance protection cannot be opened, resulting in the protection not being able to operate correctly. For symmetrical fail-open elements, the oscillating center voltage
Figure BDA0000398178980000012
Generally, two stages are adopted, and there are overlapping action areas between the two, and the opening time is inconsistent. When a three-phase short circuit occurs through the transition resistance, the opening time is longer, which affects the rapidity of protection.

综上所述,现有的振荡闭锁中故障开放元件在应对重负荷下经大过渡电阻故障、三相经过渡电阻故障时,灵敏度较低,严重时无法开放距离保护,造成保护拒动。To sum up, the existing fault-opening components in oscillation blocking have low sensitivity when dealing with heavy-load faults through large transition resistance and three-phase transition resistance faults. In serious cases, the distance protection cannot be opened, resulting in protection failure.

发明内容Contents of the invention

针对现有技术的不足,本发明的目的是提供一种振荡闭锁中故障开放元件的距离保护方法,该方法提高振荡闭锁中故障开放元件的灵敏度,使距离保护在经较大过渡电阻故障时能够正确动作。Aiming at the deficiencies in the prior art, the object of the present invention is to provide a distance protection method for fault-opening elements in oscillation blocking, which improves the sensitivity of fault-opening elements in oscillation blocking, so that distance protection can Act right.

本发明的目的是采用下述技术方案实现的:The object of the present invention is to adopt following technical scheme to realize:

本发明提供一种振荡闭锁中故障开放元件的距离保护方法,其改进之处在于,所述方法包括下述步骤:The present invention provides a distance protection method for fault-opening elements in oscillation locking, the improvement of which is that the method includes the following steps:

(1)采集保护安装处三相电流和三相电压;(1) Collect the three-phase current and three-phase voltage at the protection installation;

(2)判断是否进入振荡闭锁状态;(2) Judging whether to enter the oscillation locking state;

(3)若

Figure BDA0000398178980000021
相为基准的负序电流的绝对值小于负序电流定值
Figure BDA0000398178980000022
Figure BDA0000398178980000023
相为基准的零序电流的绝对值小于零序电流定值
Figure BDA0000398178980000024
转至步骤(7),否则,转至步骤(4);(3) If
Figure BDA0000398178980000021
The absolute value of the negative sequence current based on the phase is less than the negative sequence current setting value
Figure BDA0000398178980000022
and
Figure BDA0000398178980000023
The absolute value of the phase-based zero-sequence current is less than the zero-sequence current setting
Figure BDA0000398178980000024
Go to step (7), otherwise, go to step (4);

(4)若电流不对称度m≥0.65,开放距离保护;否则,转至步骤(5);(4) If the current asymmetry m≥0.65, enable distance protection; otherwise, go to step (5);

(5)若振荡中心电压中任一满足

Figure BDA0000398178980000026
延时200ms开放距离保护I段,瞬时开放距离保护II段;否则,转至步骤(6);(5) If the oscillation center voltage Either one satisfies
Figure BDA0000398178980000026
Delay 200ms to open distance protection section I, and instantly open distance protection section II; otherwise, go to step (6);

(6)若振荡中心电压

Figure BDA0000398178980000027
中任一满足
Figure BDA0000398178980000028
延时200ms开放距离保护I段,瞬时开放距离保护II段;若m<0.65,且
Figure BDA0000398178980000029
都满足
Figure BDA00003981789800000210
闭锁距离保护;(6) If the oscillation center voltage
Figure BDA0000398178980000027
Either one satisfies
Figure BDA0000398178980000028
Delay 200ms to open distance protection section I, and instantaneous open distance protection section II; if m<0.65, and
Figure BDA0000398178980000029
all satisfied
Figure BDA00003981789800000210
Blocking distance protection;

(7)若振荡中心电压

Figure BDA00003981789800000211
中任一满足
Figure BDA00003981789800000212
时,延时150ms开放距离保护;否则,转至步骤(8);(7) If the oscillation center voltage
Figure BDA00003981789800000211
Either one satisfies
Figure BDA00003981789800000212
, open the distance protection with a delay of 150ms; otherwise, go to step (8);

(8)若振荡中心电压中任一满足时,延时150ms开放距离保护;若

Figure BDA00003981789800000216
都满足闭锁距离保护。(8) If the oscillation center voltage Either one satisfies , delay 150ms to open the distance protection; if
Figure BDA00003981789800000216
all satisfied Blocking distance protection.

进一步地,所述步骤(1)中,保护安装处三相电流分别为

Figure BDA00003981789800000218
Figure BDA00003981789800000233
三相电压分别为
Figure BDA00003981789800000219
Figure BDA00003981789800000232
Further, in the step (1), the three-phase currents at the protection installation are respectively
Figure BDA00003981789800000218
and
Figure BDA00003981789800000233
The three-phase voltages are
Figure BDA00003981789800000219
and
Figure BDA00003981789800000232

进一步地,所述步骤(2)中,若距离保护未进入振荡闭锁,直接开放距离保护,若距离保护进入振荡闭锁,计算

Figure BDA00003981789800000220
相为基准的正序电流
Figure BDA00003981789800000221
相为基准的负序电流
Figure BDA00003981789800000222
相为基准的零序电流
Figure BDA00003981789800000223
电流不对称度m和振荡中心电压
Figure BDA00003981789800000224
Figure BDA00003981789800000234
分别为A、B、C。Further, in the step (2), if the distance protection does not enter the oscillation lock, directly open the distance protection, if the distance protection enters the oscillation lock, calculate
Figure BDA00003981789800000220
Phase-based positive sequence current
Figure BDA00003981789800000221
Negative sequence current based on phase
Figure BDA00003981789800000222
Phase-based zero-sequence current
Figure BDA00003981789800000223
Current asymmetry m and oscillation center voltage
Figure BDA00003981789800000224
Figure BDA00003981789800000234
They are A, B, and C respectively.

进一步地,所述电流不对称度

Figure BDA00003981789800000225
所述振荡中心电压
Figure BDA00003981789800000226
中的i分别为A、B、C、AB、BC和CA;Further, the current asymmetry
Figure BDA00003981789800000225
The oscillation center voltage
Figure BDA00003981789800000226
i in are A, B, C, AB, BC and CA respectively;

所述振荡中心电压

Figure BDA00003981789800000227
中的Ui分别为UA、UB、UC、UAB、UBC和UCA,分别用下述表达式表示: U A = | U &CenterDot; A | , U B = | U &CenterDot; B | , U C = | U &CenterDot; C | , U AB = | U &CenterDot; A - U &CenterDot; B | , U BC = | U &CenterDot; B - U &CenterDot; C | U CA = | U &CenterDot; C - U &CenterDot; A | ; The oscillation center voltage
Figure BDA00003981789800000227
U i in is U A , U B , U C , U AB , U BC and U CA , expressed by the following expressions: u A = | u &Center Dot; A | , u B = | u &Center Dot; B | , u C = | u &Center Dot; C | , u AB = | u &Center Dot; A - u &CenterDot; B | , u BC = | u &CenterDot; B - u &CenterDot; C | and u CA = | u &Center Dot; C - u &Center Dot; A | ;

所述振荡中心电压

Figure BDA00003981789800000230
中的
Figure BDA00003981789800000235
分别为
Figure BDA00003981789800000231
分别用下述表达式表示:
Figure BDA0000398178980000032
Figure BDA0000398178980000033
为线路阻抗角;The oscillation center voltage
Figure BDA00003981789800000230
middle
Figure BDA00003981789800000235
respectively
Figure BDA00003981789800000231
Expressed by the following expressions:
Figure BDA0000398178980000032
Figure BDA0000398178980000033
is the line impedance angle;

Figure BDA0000398178980000034
的单位是标幺值,其基准值分别为相电压或线电压的有效值。
Figure BDA0000398178980000034
The unit of is per unit value, and its reference value is the effective value of phase voltage or line voltage respectively.

进一步地,所述步骤(3)中,其中I2.set为负序电流定值,用于判断故障是否为不对称故障;I0.set为零序电流定值,用于判断故障是否为接地故障。Further, in the step (3), wherein I 2.set is the negative sequence current fixed value, which is used to judge whether the fault is an asymmetric fault; I 0.set is the zero sequence current fixed value, which is used to judge whether the fault is Ground Fault.

进一步地,所述步骤(4)中,满足

Figure BDA0000398178980000035
Figure BDA0000398178980000036
二者之一,同时m≥0.65即判断为线路发生不对称故障。Further, in the step (4), satisfy
Figure BDA0000398178980000035
and
Figure BDA0000398178980000036
One of the two, and at the same time m≥0.65, it is judged that the line has an asymmetrical fault.

进一步地,所述步骤(5)中,满足

Figure BDA0000398178980000037
Figure BDA0000398178980000038
二者之一,且m<0.65,且
Figure BDA0000398178980000039
中任一满足延时200ms开放距离保护I段,瞬时开放距离保护II段;Further, in the step (5), satisfy
Figure BDA0000398178980000037
and
Figure BDA0000398178980000038
One of the two, and m<0.65, and
Figure BDA0000398178980000039
Either one satisfies Delay 200ms to open distance protection section I, and instantaneous open distance protection section II;

任一满足

Figure BDA00003981789800000311
表示为:满足下述表达式
Figure BDA00003981789800000312
Figure BDA00003981789800000314
Figure BDA00003981789800000315
的任意一个;其中pu表示标幺值。either meet
Figure BDA00003981789800000311
Expressed as: satisfy the following expression
Figure BDA00003981789800000312
Figure BDA00003981789800000314
and
Figure BDA00003981789800000315
Any one of ; where pu represents the per unit value.

进一步地,所述步骤(6)中,满足

Figure BDA00003981789800000316
Figure BDA00003981789800000317
二者之一,且m<0.65,且
Figure BDA00003981789800000318
中任一满足
Figure BDA00003981789800000319
延时200ms开放距离保护I段,瞬时开放距离保护II段;Further, in the step (6), satisfy
Figure BDA00003981789800000316
and
Figure BDA00003981789800000317
One of the two, and m<0.65, and
Figure BDA00003981789800000318
Either one satisfies
Figure BDA00003981789800000319
Delay 200ms to open distance protection section I, and instantaneous open distance protection section II;

所述任一满足

Figure BDA00003981789800000320
表示为:满足下述表达式
Figure BDA00003981789800000321
Figure BDA00003981789800000322
Figure BDA00003981789800000323
中的任意一个;Either of the
Figure BDA00003981789800000320
Expressed as: satisfy the following expression
Figure BDA00003981789800000321
Figure BDA00003981789800000322
and
Figure BDA00003981789800000323
any of the

所述都满足

Figure BDA00003981789800000324
表示为:
Figure BDA00003981789800000325
Figure BDA00003981789800000326
表达式全部满足;All the above are satisfied
Figure BDA00003981789800000324
Expressed as:
Figure BDA00003981789800000325
Figure BDA00003981789800000326
and All expressions are satisfied;

其中pu表示标幺值。Where pu represents the per unit value.

进一步地,所述步骤(7)中,任一满足

Figure BDA0000398178980000041
表示为:满足
Figure BDA0000398178980000042
Figure BDA0000398178980000043
Figure BDA0000398178980000044
中的任意一个;其中pu表示标幺值。Further, in the step (7), any one that satisfies
Figure BDA0000398178980000041
Expressed as: satisfied
Figure BDA0000398178980000042
Figure BDA0000398178980000043
and
Figure BDA0000398178980000044
Any one of them; where pu represents the per unit value.

进一步地,所述步骤(8)中,任一满足表示为:

Figure BDA0000398178980000046
Figure BDA0000398178980000047
Figure BDA0000398178980000048
中的任意一个;Further, in the step (8), any of the Expressed as:
Figure BDA0000398178980000046
Figure BDA0000398178980000047
and
Figure BDA0000398178980000048
any of the

所述都满足

Figure BDA0000398178980000049
表示为:
Figure BDA00003981789800000411
Figure BDA00003981789800000412
全部满足;All the above are satisfied
Figure BDA0000398178980000049
Expressed as:
Figure BDA00003981789800000411
and
Figure BDA00003981789800000412
all satisfied;

其中pu表示标幺值。Where pu represents the per unit value.

与现有技术比,本发明达到的有益效果是:Compared with prior art, the beneficial effect that the present invention reaches is:

本发明提供的振荡闭锁中故障开放元件的距离保护方法,通过改进对称故障开放条件,重新设计了对称故障开放区,减少了对称故障时的保护开放延时,提高振荡闭锁中对称故障开放元件的灵敏度,有利于快速切除三相短路故障,保证系统稳定运行,对于不对称故障开放元件,利用电流不对称度m和振荡中心电压

Figure BDA00003981789800000413
互相配合,m开放严重不对称故障,
Figure BDA00003981789800000414
开放轻微不对称故障,使距离保护在经较大过渡电阻故障时能够正确开放,提高距离保护的耐过渡能力。The distance protection method of the fault-opening element in the oscillation blocking provided by the present invention redesigns the symmetrical fault-opening area by improving the symmetrical fault-opening condition, reduces the protection opening delay in the case of a symmetrical fault, and improves the protection of the symmetrical fault-opening element in the oscillation blocking Sensitivity, which is beneficial to quickly remove three-phase short-circuit faults and ensure stable operation of the system. For asymmetric fault-opening components, use current asymmetry m and oscillation center voltage
Figure BDA00003981789800000413
cooperate with each other, m open severe asymmetric faults,
Figure BDA00003981789800000414
Open slightly asymmetrical faults, so that the distance protection can be opened correctly when a large transition resistance fault occurs, and improve the transition resistance of the distance protection.

附图说明Description of drawings

图1是本发明提供的振荡闭锁中故障开放元件的距离保护方法的流程图。Fig. 1 is a flowchart of a distance protection method for a fault-open element in oscillation blocking provided by the present invention.

具体实施方式Detailed ways

下面结合附图对本发明的具体实施方式作进一步的详细说明。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

在电力系统线路上安装保护装置,功能包括主保护与后备保护,对于110kV及以上电压等级线路保护采用距离保护作为后备保护,距离保护受系统振荡影响,需要对距离保护I、II段采取振荡闭锁措施,为了应对振荡闭锁期间发生故障距离保护无法动作,需要配置振荡闭锁开放元件,振荡闭锁开放元件分为对称故障开放元件和不对称故障开放元件,本发明针对振荡闭锁中的开放元件进行改进,提高距离保护在振荡闭锁期间发生故障时的动作性能,提供了一种振荡闭锁中故障开放元件距离保护方法。Install protection devices on the power system lines. The functions include main protection and backup protection. For 110kV and above voltage level line protection, distance protection is used as backup protection. Distance protection is affected by system oscillation, and it is necessary to adopt oscillation blocking for distance protection sections I and II Measures, in order to deal with the failure of the fault distance protection during the oscillation locking period, it is necessary to configure the oscillation locking opening element. The oscillation locking opening element is divided into a symmetrical fault opening element and an asymmetrical fault opening element. The present invention improves the opening element in the oscillation locking, To improve the action performance of distance protection when a fault occurs during oscillation blocking, a distance protection method for fault-open elements in oscillation blocking is provided.

该方法的流程图如图1所示,包括下述步骤:The flow chart of this method is shown in Figure 1, comprises the following steps:

(1)采集保护安装处三相电流和三相电压:三相电流分别为

Figure BDA0000398178980000051
Figure BDA00003981789800000520
三相电压分别为
Figure BDA0000398178980000052
(1) Collect the three-phase current and three-phase voltage at the place where the protection is installed: the three-phase currents are respectively
Figure BDA0000398178980000051
and
Figure BDA00003981789800000520
The three-phase voltages are
Figure BDA0000398178980000052
and

(2)判断是否进入振荡闭锁状态:(2) Judging whether to enter the oscillation locking state:

若距离保护未进入振荡闭锁,直接开放距离保护,若距离保护进入振荡闭锁,以A相为例,计算A相为基准的正序电流

Figure BDA0000398178980000053
A相为基准的负序电流
Figure BDA0000398178980000054
A相为基准的零序电流
Figure BDA0000398178980000055
电流不对称度m和振荡中心电压
Figure BDA0000398178980000056
If the distance protection does not enter oscillation blocking, open the distance protection directly; if the distance protection enters oscillation blocking, take phase A as an example, calculate the positive sequence current based on phase A
Figure BDA0000398178980000053
Negative sequence current based on phase A
Figure BDA0000398178980000054
Zero-sequence current based on phase A
Figure BDA0000398178980000055
Current asymmetry m and oscillation center voltage
Figure BDA0000398178980000056

所述电流不对称度

Figure BDA0000398178980000057
所述振荡中心电压
Figure BDA0000398178980000058
中的i分别为A、B、C、AB、BC和CA;The current asymmetry
Figure BDA0000398178980000057
The oscillation center voltage
Figure BDA0000398178980000058
i in are A, B, C, AB, BC and CA respectively;

所述振荡中心电压

Figure BDA0000398178980000059
中的Ui分别为UA、UB、UC、UAB、UBC和UCA,分别用下述表达式表示: U A = | U &CenterDot; A | , U B = | U &CenterDot; B | , U C = | U &CenterDot; C | , U AB = | U &CenterDot; A - U &CenterDot; B | , U BC = | U &CenterDot; B - U &CenterDot; C | U CA = | U &CenterDot; C - U &CenterDot; A | ; The oscillation center voltage
Figure BDA0000398178980000059
U i in is U A , U B , U C , U AB , U BC and U CA , expressed by the following expressions: u A = | u &Center Dot; A | , u B = | u &Center Dot; B | , u C = | u &Center Dot; C | , u AB = | u &Center Dot; A - u &CenterDot; B | , u BC = | u &CenterDot; B - u &Center Dot; C | and u CA = | u &CenterDot; C - u &CenterDot; A | ;

所述振荡中心电压

Figure BDA00003981789800000512
中的
Figure BDA00003981789800000521
分别为
Figure BDA00003981789800000513
分别用下述表达式表示:
Figure BDA00003981789800000515
为线路阻抗角。The oscillation center voltage
Figure BDA00003981789800000512
middle
Figure BDA00003981789800000521
respectively
Figure BDA00003981789800000513
Expressed by the following expressions:
Figure BDA00003981789800000515
is the line impedance angle.

(3)若A相为基准的负序电流的绝对值小于负序电流定值

Figure BDA00003981789800000517
且A相为基准的零序电流的绝对值小于零序电流定值
Figure BDA00003981789800000518
转至步骤(7),否则,转至步骤(4);其中I2.set为负序电流定值,用于判断故障是否为不对称故障;I0.set为零序电流定值,用于判断故障是否为接地故障。(3) If the absolute value of the negative sequence current based on phase A is less than the negative sequence current fixed value
Figure BDA00003981789800000517
And the absolute value of the zero-sequence current based on phase A is less than the zero-sequence current setting
Figure BDA00003981789800000518
Go to step (7), otherwise, go to step (4); where I 2.set is the negative-sequence current setting, used to judge whether the fault is an asymmetrical fault; I 0.set is the zero-sequence current setting, use It is used to judge whether the fault is a ground fault.

(4)若电流不对称度m≥0.65,开放距离保护;否则,转至步骤(5);满足

Figure BDA0000398178980000062
二者之一,同时m≥0.65即判断为线路发生不对称故障。(4) If the current asymmetry m≥0.65, open the distance protection; otherwise, go to step (5); satisfy and
Figure BDA0000398178980000062
One of the two, and at the same time m≥0.65, it is judged that the line has an asymmetrical fault.

(5)满足

Figure BDA0000398178980000063
Figure BDA00003981789800000631
二者之一,且m<0.65,且中任一满足延时200ms开放距离保护I段,瞬时开放距离保护II段;否则,转至步骤(6);(5) meet
Figure BDA0000398178980000063
and
Figure BDA00003981789800000631
One of the two, and m<0.65, and Either one satisfies Delay 200ms to open distance protection section I, and instantly open distance protection section II; otherwise, go to step (6);

任一满足

Figure BDA0000398178980000066
表示为:满足下述表达式
Figure BDA0000398178980000067
Figure BDA0000398178980000068
Figure BDA0000398178980000069
Figure BDA00003981789800000610
的任意一个;其中pu表示标幺值。;either meet
Figure BDA0000398178980000066
Expressed as: satisfy the following expression
Figure BDA0000398178980000067
Figure BDA0000398178980000068
Figure BDA0000398178980000069
and
Figure BDA00003981789800000610
Any one of ; where pu represents the per unit value. ;

任一满足

Figure BDA00003981789800000611
表示为:满足下述表达式
Figure BDA00003981789800000612
Figure BDA00003981789800000613
Figure BDA00003981789800000614
Figure BDA00003981789800000615
的任意一个;其中pu表示标幺值。either meet
Figure BDA00003981789800000611
Expressed as: satisfy the following expression
Figure BDA00003981789800000612
Figure BDA00003981789800000613
Figure BDA00003981789800000614
and
Figure BDA00003981789800000615
Any one of ; where pu represents the per unit value.

(6)满足

Figure BDA00003981789800000632
二者之一,且m<0.65,且
Figure BDA00003981789800000617
中任一满足
Figure BDA00003981789800000618
延时200ms开放距离保护I段,瞬时开放距离保护II段;(6) meet and
Figure BDA00003981789800000632
One of the two, and m<0.65, and
Figure BDA00003981789800000617
Either one satisfies
Figure BDA00003981789800000618
Delay 200ms to open distance protection section I, and instantaneous open distance protection section II;

若m<0.65,且

Figure BDA00003981789800000619
都满足闭锁距离保护;If m<0.65, and
Figure BDA00003981789800000619
all satisfied Blocking distance protection;

所述任一满足

Figure BDA00003981789800000622
表示为:满足下述表达式
Figure BDA00003981789800000623
中的任意一个;Either of the
Figure BDA00003981789800000622
Expressed as: satisfy the following expression
Figure BDA00003981789800000623
and any of the

所述都满足

Figure BDA00003981789800000627
表示为:
Figure BDA00003981789800000628
Figure BDA00003981789800000629
Figure BDA00003981789800000630
表达式全部满足;其中pu表示标幺值。All the above are satisfied
Figure BDA00003981789800000627
Expressed as:
Figure BDA00003981789800000628
Figure BDA00003981789800000629
and
Figure BDA00003981789800000630
The expressions are all satisfied; where pu represents the per unit value.

(7)若

Figure BDA0000398178980000071
Figure BDA00003981789800000726
且振荡中心电压
Figure BDA0000398178980000072
中任一满足时,延时150ms开放距离保护;否则,转至步骤(8);(7) If
Figure BDA0000398178980000071
and
Figure BDA00003981789800000726
And the oscillation center voltage
Figure BDA0000398178980000072
Either one satisfies , open the distance protection with a delay of 150ms; otherwise, go to step (8);

任一满足

Figure BDA0000398178980000074
表示为:满足
Figure BDA0000398178980000075
Figure BDA0000398178980000076
Figure BDA0000398178980000077
Figure BDA0000398178980000078
中的任意一个;其中pu表示标幺值。either meet
Figure BDA0000398178980000074
Expressed as: satisfied
Figure BDA0000398178980000075
Figure BDA0000398178980000076
Figure BDA0000398178980000077
and
Figure BDA0000398178980000078
Any one of them; where pu represents the per unit value.

(8)若

Figure BDA00003981789800000710
且振荡中心电压中任一满足时,延时150ms开放距离保护;若
Figure BDA00003981789800000713
都满足
Figure BDA00003981789800000714
闭锁距离保护;(8) If and
Figure BDA00003981789800000710
And the oscillation center voltage Either one satisfies , delay 150ms to open the distance protection; if
Figure BDA00003981789800000713
all satisfied
Figure BDA00003981789800000714
Blocking distance protection;

任一满足

Figure BDA00003981789800000715
表示为:
Figure BDA00003981789800000717
Figure BDA00003981789800000718
Figure BDA00003981789800000719
中的任意一个;either meet
Figure BDA00003981789800000715
Expressed as:
Figure BDA00003981789800000717
Figure BDA00003981789800000718
and
Figure BDA00003981789800000719
any of the

所述都满足

Figure BDA00003981789800000720
表示为:
Figure BDA00003981789800000721
Figure BDA00003981789800000722
Figure BDA00003981789800000723
全部满足;All the above are satisfied
Figure BDA00003981789800000720
Expressed as:
Figure BDA00003981789800000721
Figure BDA00003981789800000722
and
Figure BDA00003981789800000723
all satisfied;

其中pu表示标幺值。Where pu represents the per unit value.

本发明提供的振荡闭锁中故障开放元件的距离保护方法,通过改进对称故障开放条件,重新设计了对称故障开放区,减少了对称故障时的保护开放延时,提高振荡闭锁中对称故障开放元件的灵敏度,有利于快速切除三相短路故障,保证系统稳定运行,对于不对称故障开放元件,利用电流不对称度m和振荡中心电压互相配合,m开放严重不对称故障,

Figure BDA00003981789800000725
开放轻微不不对称故障,使距离保护在经较大过渡电阻故障时能够正确开放,提高距离保护的耐过渡能力。The distance protection method of the fault-opening element in the oscillation blocking provided by the present invention redesigns the symmetrical fault-opening area by improving the symmetrical fault-opening condition, reduces the protection opening delay in the case of a symmetrical fault, and improves the protection of the symmetrical fault-opening element in the oscillation blocking Sensitivity, which is beneficial to quickly remove three-phase short-circuit faults and ensure stable operation of the system. For asymmetric fault-opening components, use current asymmetry m and oscillation center voltage cooperate with each other, m open severe asymmetric faults,
Figure BDA00003981789800000725
The opening of slightly asymmetrical faults enables the distance protection to be opened correctly when a large transition resistance fault occurs, and improves the transition resistance of the distance protection.

最后应当说明的是:以上实施例仅用以说明本发明的技术方案而非对其限制,尽管参照上述实施例对本发明进行了详细的说明,所属领域的普通技术人员应当理解:依然可以对本发明的具体实施方式进行修改或者等同替换,而未脱离本发明精神和范围的任何修改或者等同替换,其均应涵盖在本发明的权利要求范围当中。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (10)

1. a distance protecting method for fault opening element in out-of-step blocking, is characterized in that, described method comprises the steps:
(1) gather protection installation place three-phase current and three-phase voltage;
(2) judge whether to enter out-of-step blocking state;
(3) if
Figure FDA0000398178970000011
the absolute value that is mutually the negative-sequence current of benchmark is less than negative-sequence current definite value and
Figure FDA0000398178970000013
the absolute value that is mutually the zero-sequence current of benchmark is less than zero-sequence current definite value
Figure FDA0000398178970000014
go to step (7), otherwise, go to step (4);
(4) if current asymmetry degree m >=0.65, open distance protection; Otherwise, go to step (5);
(5) if voltage of oscillation center
Figure FDA0000398178970000015
in arbitraryly meet
Figure FDA0000398178970000016
time delay 200ms open distance protection I section, instantaneous open distance protection II section; Otherwise, go to step (6);
(6) if voltage of oscillation center in arbitraryly meet
Figure FDA0000398178970000018
time delay 200ms open distance protection I section, instantaneous open distance protection II section; If m < 0.65, and
Figure FDA0000398178970000019
all meet
Figure FDA00003981789700000110
locking distance protection;
(7) if voltage of oscillation center
Figure FDA00003981789700000111
in arbitraryly meet time, the protection of time delay 150ms open distance; Otherwise, go to step (8);
(8) if voltage of oscillation center
Figure FDA00003981789700000113
in arbitraryly meet
Figure FDA00003981789700000114
time, the protection of time delay 150ms open distance; If
Figure FDA00003981789700000115
all meet
Figure FDA00003981789700000116
locking distance protection.
2. distance protecting method as claimed in claim 1, is characterized in that, in described step (1), protection installation place three-phase current is respectively
Figure FDA00003981789700000117
with
Figure FDA00003981789700000128
three-phase voltage is respectively
Figure FDA00003981789700000118
with
Figure FDA00003981789700000129
3. distance protecting method as claimed in claim 1, is characterized in that, in described step (2), if distance protection does not enter out-of-step blocking, directly open distance protection, if distance protection enters out-of-step blocking, calculates be the forward-order current of benchmark mutually
Figure FDA00003981789700000120
Figure FDA00003981789700000121
be the negative-sequence current of benchmark mutually
Figure FDA00003981789700000122
be the zero-sequence current of benchmark mutually
Figure FDA00003981789700000123
current asymmetry degree m and voltage of oscillation center
Figure FDA00003981789700000124
be respectively A, B, C.
4. distance protecting method as claimed in claim 3, is characterized in that, described current asymmetry degree
Figure FDA00003981789700000125
described voltage of oscillation center
Figure FDA00003981789700000126
in i be respectively A, B, C, AB, BC and CA;
Described voltage of oscillation center
Figure FDA00003981789700000127
in Ui be respectively U a, U b, U c, U aB, U bCand U cA, by following expression formula, represent respectively: U A = | U &CenterDot; A | , U B = | U &CenterDot; B | , U C = | U &CenterDot; C | , U AB = | U &CenterDot; A - U &CenterDot; B | , U BC = | U &CenterDot; B - U &CenterDot; C | With U CA = | U &CenterDot; C - U &CenterDot; A | ;
Described voltage of oscillation center in
Figure FDA0000398178970000024
be respectively
Figure FDA0000398178970000025
by following expression formula, represent respectively:
Figure FDA0000398178970000026
Figure FDA0000398178970000027
Figure FDA0000398178970000028
for line impedance angle;
Figure FDA00003981789700000226
unit be perunit value, its fiducial value is respectively the effective value of phase voltage or line voltage.
5. distance protecting method as claimed in claim 1, is characterized in that, in described step (3), and I wherein 2.setfor negative-sequence current definite value, for failure judgement, whether be unbalanced fault; I 0.setfor zero-sequence current definite value, for failure judgement, whether be earth fault.
6. distance protecting method as claimed in claim 1, is characterized in that, in described step (4), meets
Figure FDA0000398178970000029
with
Figure FDA00003981789700000210
one of the two, m>=0.65 is judged as circuit generation unbalanced fault simultaneously.
7. distance protecting method as claimed in claim 1, is characterized in that, in described step (5), meets
Figure FDA00003981789700000211
with
Figure FDA00003981789700000212
one of the two, and m < 0.65, and in arbitraryly meet
Figure FDA00003981789700000214
time delay 200ms open distance protection I section, instantaneous open distance protection II section;
Arbitrary satisfied
Figure FDA00003981789700000215
be expressed as: meet following expression formula
Figure FDA00003981789700000217
Figure FDA00003981789700000218
with
Figure FDA00003981789700000219
any one; Wherein pu represents perunit value.
8. distance protecting method as claimed in claim 1, is characterized in that, in described step (6), meets
Figure FDA00003981789700000220
with
Figure FDA00003981789700000221
one of the two, and m < 0.65, and
Figure FDA00003981789700000222
in arbitraryly meet
Figure FDA00003981789700000223
time delay 200ms open distance protection I section, instantaneous open distance protection II section;
Described arbitrary satisfied
Figure FDA00003981789700000224
be expressed as: meet following expression formula
Figure FDA00003981789700000225
Figure FDA0000398178970000031
with
Figure FDA0000398178970000032
in any one;
Describedly all meet
Figure FDA0000398178970000033
be expressed as:
Figure FDA0000398178970000035
with
Figure FDA0000398178970000036
expression formula all meets;
Wherein pu represents perunit value.
9. distance protecting method as claimed in claim 1, is characterized in that, in described step (7), arbitrary satisfied
Figure FDA0000398178970000037
be expressed as: meet
Figure FDA0000398178970000038
Figure FDA0000398178970000039
Figure FDA00003981789700000310
with
Figure FDA00003981789700000311
in any one; Wherein pu represents perunit value.
10. distance protecting method as claimed in claim 1, is characterized in that, in described step (8), arbitrary satisfied
Figure FDA00003981789700000312
be expressed as:
Figure FDA00003981789700000313
Figure FDA00003981789700000314
with
Figure FDA00003981789700000315
in any one;
Describedly all meet
Figure FDA00003981789700000316
be expressed as:
Figure FDA00003981789700000317
Figure FDA00003981789700000318
with
Figure FDA00003981789700000319
all meet;
Wherein pu represents perunit value.
CN201310492175.4A 2013-10-18 2013-10-18 A Distance Protection Method for Fail-Open Components in Oscillating Blocking Active CN103545798B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310492175.4A CN103545798B (en) 2013-10-18 2013-10-18 A Distance Protection Method for Fail-Open Components in Oscillating Blocking

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310492175.4A CN103545798B (en) 2013-10-18 2013-10-18 A Distance Protection Method for Fail-Open Components in Oscillating Blocking

Publications (2)

Publication Number Publication Date
CN103545798A true CN103545798A (en) 2014-01-29
CN103545798B CN103545798B (en) 2016-08-03

Family

ID=49968990

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310492175.4A Active CN103545798B (en) 2013-10-18 2013-10-18 A Distance Protection Method for Fail-Open Components in Oscillating Blocking

Country Status (1)

Country Link
CN (1) CN103545798B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104134976A (en) * 2014-08-14 2014-11-05 国家电网公司 A Fault Identification Method in Transmission Line Distance Protection
CN104332966A (en) * 2014-10-15 2015-02-04 国家电网公司 Distance protection analysis method based on two-dimensional plane
CN105071360A (en) * 2015-08-17 2015-11-18 中国电力科学研究院 A Method for Identifying Adjacent Line Faults
CN105207176A (en) * 2015-08-17 2015-12-30 中国电力科学研究院 Line protection method
CN106253241A (en) * 2016-08-02 2016-12-21 华北电力大学 A kind of protection out-of-step blocking and open systems and control method thereof again
CN106329494A (en) * 2016-08-02 2017-01-11 华北电力大学 Oscillation center tracking and protection locking system and control method therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101034128A (en) * 2007-02-09 2007-09-12 田伟 Method for quickly recognizing symmetrical failure in vibration
CN101710696A (en) * 2009-12-03 2010-05-19 华中电网有限公司 Method for solving line-protection false tripping when overloading
CN102103158A (en) * 2010-12-15 2011-06-22 国网电力科学研究院 Method for judging adaptive statically stable current based on power angle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101034128A (en) * 2007-02-09 2007-09-12 田伟 Method for quickly recognizing symmetrical failure in vibration
CN101710696A (en) * 2009-12-03 2010-05-19 华中电网有限公司 Method for solving line-protection false tripping when overloading
CN102103158A (en) * 2010-12-15 2011-06-22 国网电力科学研究院 Method for judging adaptive statically stable current based on power angle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
侯慧等: ""振荡闭锁期间再故障的距离保护判别方法"", 《继电器》 *
柳焕章等: ""继电保护振荡闭锁的改进措施"", 《中国电机工程学报》 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104134976A (en) * 2014-08-14 2014-11-05 国家电网公司 A Fault Identification Method in Transmission Line Distance Protection
CN104134976B (en) * 2014-08-14 2017-03-08 国家电网公司 Fault identification method in power transmission line distance protection
CN104332966A (en) * 2014-10-15 2015-02-04 国家电网公司 Distance protection analysis method based on two-dimensional plane
CN104332966B (en) * 2014-10-15 2017-06-23 国家电网公司 Distance protection analysis method based on two-dimensional plane
CN105071360A (en) * 2015-08-17 2015-11-18 中国电力科学研究院 A Method for Identifying Adjacent Line Faults
CN105207176A (en) * 2015-08-17 2015-12-30 中国电力科学研究院 Line protection method
CN105071360B (en) * 2015-08-17 2018-07-17 中国电力科学研究院 Method for identifying adjacent line fault
CN106253241A (en) * 2016-08-02 2016-12-21 华北电力大学 A kind of protection out-of-step blocking and open systems and control method thereof again
CN106329494A (en) * 2016-08-02 2017-01-11 华北电力大学 Oscillation center tracking and protection locking system and control method therefor
CN106329494B (en) * 2016-08-02 2018-11-09 华北电力大学 A kind of tracking of oscillation center and protection blocking system and its control method
CN106253241B (en) * 2016-08-02 2018-12-18 华北电力大学 A kind of protection out-of-step blocking and open system and its control method again

Also Published As

Publication number Publication date
CN103545798B (en) 2016-08-03

Similar Documents

Publication Publication Date Title
CN103545798B (en) A Distance Protection Method for Fail-Open Components in Oscillating Blocking
CN104953568B (en) A kind of fault protecting method of flexible direct current power transmission system
CN108872792A (en) A kind of electric transmission line fault detection method
CN103746352B (en) A kind of route protection phase-selecting method not affected by the method for operation
CN101651328B (en) Inter-turn protection method and device for shunt reactor
CN103872666B (en) A load and single-phase-to-ground fault identification method based on voltage plane
CN103545782B (en) Distance protection setting method for oscillation locking
CN102590655A (en) Failure direction judgment element and judgment method for direct current transmission line
CN106981861A (en) An anti-misoperation method for zero-sequence longitudinal protection of double-circuit lines on the same tower for longitudinal faults
CN104393579B (en) A Method to Overcome the Influence of Drain Current on Bus Differential Protection
CN104076248B (en) A Fault Direction Judgment Method Based on Positive Sequence Polarization Voltage Phase Comparison
CN103795042B (en) Pilot protection system and guard method thereof based on virtual transition impedance
CN103956712B (en) Grounding distance protection solution method adaptive to overload state
CN103390886B (en) Circuit distance protection maloperation prevention method
CN100442623C (en) Inter-turn short-circuit protection method for shunt reactor of ultra-high voltage transmission line
CN104134976A (en) A Fault Identification Method in Transmission Line Distance Protection
CN107317310A (en) A zero-sequence voltage compensation component blocking method and device for double-circuit lines on the same tower
CN103116116B (en) The method of discrimination of cross line fault character, device and a kind of reclosing method, system
CN103944142A (en) Backup Protection Method for Phase-to-Phase Short Circuit of Transformer Based on Positive Sequence Component of Compensation Voltage
CN105207176B (en) Line protection method
CN103779835A (en) Transformer winding turn-to-turn short circuit relay protection method based on iron loss reactive power characteristic
CN106501661A (en) A kind of transmission line of electricity broken string area judging method based on signal transmission
CN105552855B (en) Prevent 3/2 mode of connection list CT saturations from causing the method for distance protection malfunction
CN105182185A (en) Line fault identification method based on directional current construction
CN106602523B (en) Method for realizing zero sequence current differential phase selection

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant