WO2020253301A1 - 一种继电保护冗余采样及异常判别的方法 - Google Patents

一种继电保护冗余采样及异常判别的方法 Download PDF

Info

Publication number
WO2020253301A1
WO2020253301A1 PCT/CN2020/081449 CN2020081449W WO2020253301A1 WO 2020253301 A1 WO2020253301 A1 WO 2020253301A1 CN 2020081449 W CN2020081449 W CN 2020081449W WO 2020253301 A1 WO2020253301 A1 WO 2020253301A1
Authority
WO
WIPO (PCT)
Prior art keywords
value
redundant sampling
sampling
instantaneous
redundant
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.)
Ceased
Application number
PCT/CN2020/081449
Other languages
English (en)
French (fr)
Inventor
赵青春
刘奎
张洪喜
陆金凤
李响
邵通广
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.)
NR Electric Co Ltd
NR Engineering Co Ltd
Original Assignee
NR Electric Co Ltd
NR Engineering Co Ltd
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 NR Electric Co Ltd, NR Engineering Co Ltd filed Critical NR Electric Co Ltd
Publication of WO2020253301A1 publication Critical patent/WO2020253301A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements

Definitions

  • the application belongs to the field of power system relay protection, and specifically relates to a method for redundant sampling and abnormality discrimination of relay protection.
  • the power system relay protection device is an automatic device that quickly and accurately trips the circuit breaker or sends a signal when the electrical components in the power system fail or operate abnormally.
  • the relay protection device collects AC analog voltage and current through the acquisition module.
  • Each channel of AC analog input is equipped with a sampling loop, as shown in Figure 1, including, analog filter, sample-and-hold and A/D converter, which converts analog to secondary voltage/current digital, and then to processing Device. Due to the damage of the sampling loop components and other reasons, the sampling is abnormal, which seriously affects the reliability of the relay protection.
  • the sampling loop of the relay protection equipment applied to the high-voltage power grid adopts a redundant architecture; the purpose is that when a single element failure occurs in the sampling loop, the equipment can accurately determine the hardware failure in time and avoid An incorrect circuit breaker action command was issued.
  • the application number is 201810547244.X and the Chinese invention patent entitled “Method, Device, Terminal Equipment and Storage Medium for Determining the Consistency of Double Sampling Values” discloses a method for determining the consistency of double sampling values: The vector sum and vector difference of the sampled value and the second sampled value, calculate the integral value of the vector sum within the first preset time and the integral value of the vector difference within the first preset time; when the integral value of the vector sum and the integral of the vector difference When the value meets the preset condition, it is determined that the first sampled value and the second sampled value are inconsistent.
  • the invention can effectively prevent the incorrect action of the relay protection device. But for the quick-action section protection without delay, the scheme disclosed in this invention has a longer delay, which cannot be effective in extreme cases.
  • this application proposes a method for redundant sampling and abnormality discrimination of relay protection, which uses the instantaneous value of the sampled value to perform redundant sampling abnormality discrimination.
  • a relay protection redundant sampling detection method including:
  • the redundant sampling abnormality is judged.
  • the redundant sampling abnormality determination includes:
  • Judgment condition 1 whether the absolute value of the instantaneous value difference is greater than the absolute value of the sum of the instantaneous values that are multiples of the first preset value; if yes, then the judgment condition 1 is established;
  • Judgment condition 2 whether the absolute value of the instantaneous value difference is greater than the secondary voltage or secondary current rating that is a multiple of the second preset value; if yes, then the judgment condition 2 is established;
  • the specific formula of the discrimination condition 1 is:
  • a i (n) is the instantaneous value of the nth point of the sample value one
  • a j (n) is the instantaneous value of the nth point of the sample value two
  • ⁇ is the first preset value.
  • the specific formula of the discrimination condition 2 is:
  • a i (n) is the instantaneous value of the nth point of sampled value one
  • a j (n) is the instantaneous value of the nth point of sampled value two
  • ⁇ is the second preset value
  • a n is the secondary voltage or two Secondary current rating.
  • the protection function corresponding to the redundant sampling abnormal channel is blocked.
  • a sampling abnormality alarm signal is issued.
  • a relay protection method including:
  • the relay protection device is equipped with a pre-redundant sampling loop
  • the protection function corresponding to the redundant sampling abnormal channel is blocked.
  • the redundant sampling abnormality judgment in the foregoing relay protection method includes:
  • a i (n) is the instantaneous value of the nth point of the sample value one;
  • a j (n) is the instantaneous value of the nth point of the sample value two;
  • ⁇ is the first preset value, and ⁇ is the second preset value;
  • a n is the rated value of secondary voltage or secondary current.
  • an electronic device including a memory, a processor, and a computer program stored on the memory and capable of being run on the processor, characterized in that, when the program is executed by the processor , Causing the processor to execute the method as described above.
  • a computer-readable storage medium on which a computer program is stored, wherein when the computer program is executed by a processor, the processor is caused to execute the method described above .
  • This application proposes a relay protection redundant sampling detection method, which includes: obtaining sampled value 1 and sampled value 2 after redundant sampling of the measured voltage/current respectively; according to the instantaneous value difference between sampled value 1 and sampled value 2, The instantaneous value and the secondary voltage/secondary current rating are used for redundant sampling to determine abnormalities.
  • the technical solution provided by this application can quickly determine the redundant sampling abnormality, and then quickly block the quick-action section protection without delay, and prevent the relay protection device from operating incorrectly.
  • Figure 1 is a schematic diagram of the sampling loop of the present application in the prior art.
  • Fig. 2 is a flowchart of a relay protection redundant sampling and abnormality discrimination method according to the present application.
  • this application provides a method for redundant sampling and abnormality discrimination of relay protection, which includes the following steps:
  • Step 1 The relay protection device is equipped with a pre-redundant sampling loop.
  • Step 2 Obtain sample value one and sample value two of the measured electrical quantity after redundant sampling.
  • Step 3 Perform redundant sampling abnormality judgment on sampled value 1 and sampled value 2.
  • the discrimination method is:
  • Judgment condition 1 whether the absolute value of the instantaneous value difference is greater than the absolute value of the sum of the instantaneous values that are multiples of the first preset value; if yes, then the judgment condition 1 is established;
  • Judgment condition 2 whether the absolute value of the instantaneous value difference is greater than the secondary voltage or secondary current rating that is a multiple of the second preset value; if yes, then the judgment condition 2 is established;
  • a i (n) is the instantaneous value of the nth point of the sample value one
  • a j (n) is the instantaneous value of the nth point of the sample value two
  • ⁇ is the first preset value.
  • step 3 the specific formula of the judgment condition 2 in step 3 is:
  • a i (n) is the instantaneous value of the nth point of sampled value one
  • a j (n) is the instantaneous value of the nth point of sampled value two
  • ⁇ is the second preset value
  • a n is the secondary voltage or two Secondary current rating.
  • the protection function corresponding to the redundant sampling abnormal channel is blocked, and a sampling abnormal alarm signal is issued.
  • the value of k in the discrimination condition 1 is 0.2, and the value of ⁇ in the discrimination condition 2 is 0.3.
  • an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor.
  • the program When the program is executed by the processor, the The processor executes the method described above.
  • a computer-readable storage medium having a computer program stored thereon, wherein, when the computer program is executed by a processor, the processor is caused to execute the method as described above .

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

本申请公开了一种继电保护冗余采样检测方法，包括：获取被测电压/电流分别经冗余采样后的采样值一和采样值二；根据采样值一和采样值二的瞬时值差、瞬时值和、二次电压/二次电流额定值进行冗余采样异常判别。本申请能够快速判别冗余采样异常，进而快速闭锁无延时的速动段保护，防止继电保护装置不正确动作。

Description

一种继电保护冗余采样及异常判别的方法 技术领域
本申请属于电力系统继电保护领域，具体涉及一种继电保护冗余采样及异常判别的方法。
背景技术
电力系统继电保护装置是当电力系统中的电气元件发生故障或不正常运行时，快速而准确地使断路器跳闸或发出信号的自动装置。
继电保护装置通过采集模块采集交流模拟电压、电流量。每一路交流模拟量输入都装有采样回路，如图1所示，包括、模拟滤波器、采样保持器和A/D转换器，将模拟量转换为二次电压/电流数字量，再到处理器。由于采样回路元件损坏等原因，造成采样异常，严重影响继电保护的可靠性。
为提高继电保护系统的可靠性，应用于高电压等级电网的继电保护设备的采样回路采用冗余架构；目的是在采样回路中发生单一元件故障时，设备能及时准确判断硬件故障，避免发出错误的断路器动作命令。
申请号为201810547244.X，发明名称为“双采样值的一致性确定方法、装置、终端设备及存储介质”的中国发明专利中，公开了一种双采样值的一致性确定方法：根据第一采样值和第二采样值的矢量和与矢量差，计算第一预设时间内矢量和的积分值与第一预设时间内矢量差的积分值；当矢量和的积分值与矢量差的积分值满足预设条件时，确定第一采样值和第二采样值不一致。对于带延时的后备段保护，该发明可以有效防止继电保护装置不正确动作。但对于无延时的速动段保护，该发明公开的方案延时较长，极端情况下不能起到有效作用。
发明内容
针对上述问题，本申请提出一种继电保护冗余采样及异常判别的方法，利用采样值的瞬时值进行冗余采样异常判别。
为了实现上述技术目的，达到上述技术效果，根据本申请的一个方面，提供一种继电保护冗余采样检测方法，包括：
获取被测电压/电流分别经冗余采样后的采样值一和采样值二；
根据采样值一和采样值二的瞬时值差、瞬时值和、二次电压/二次电流额定值进行冗余 采样异常判别。
根据一些实施例，所述冗余采样异常判别包括：
计算采样值一和采样值二的瞬时值差及瞬时值和；
对判别条件一和判别条件二进行判定：
判别条件1，瞬时值差的绝对值是否大于第一预设值倍数的瞬时值和的绝对值；是，则判别条件1成立；
判别条件2，瞬时值差的绝对值是否大于第二预设值倍数的二次电压或二次电流额定值；是，则判别条件2成立；
若判别条件1和判别条件2均成立，则判定冗余采样异常。
根据一些实施例，所述判别条件1的具体公式为：
|A i(n)-A j(n)|＞α|A i(n)+A j(n)|
其中：A i(n)为采样值一的第n点瞬时值；A j(n)为采样值二的第n点瞬时值；α为第一预设值。
根据一些实施例，所述判别条件2的具体公式为：
|A i(n)-A j(n)|＞βA n
其中：A i(n)为采样值一的第n点瞬时值；A j(n)为采样值二的第n点瞬时值；β为第二预设值；A n为二次电压或二次电流额定值。
根据一些实施例，判定冗余采样异常后，闭锁冗余采样异常通道相对应的保护功能。
根据一些实施例，判定冗余采样异常后，发出采样异常报警信号。
根据本申请的另一方面，提供一种继电保护方法，包括：
继电保护装置设置前置冗余采样回路；
获取被测电压/电流分别经冗余采样后的采样值一和采样值二；
根据采样值一和采样值二的瞬时值差、瞬时值和、二次电压/二次电流额定值进行冗余采样异常判别；
判定冗余采样异常后，闭锁冗余采样异常通道相对应的保护功能。
根据一些实施例，上述继电保护方法中的冗余采样异常判别包括：
若同时满足下面公式，则判定采样异常：
公示1:|A i(n)-A j(n)|＞α|A i(n)+A j(n)|
公示2:|A i(n)-A j(n)|＞βA n
其中，A i(n)为采样值一的第n点瞬时值；A j(n)为采样值二的第n点瞬时值；α为第一预设值，β为第二预设值；A n为二次电压或二次电流额定值。
根据本申请的又一方面，提供一种电子设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，其特征在于，当所述程序被所述处理器执行时，使得所述处理器执行如上所述的方法。
根据本申请的再一方面，提供一种计算机可读存储介质，其上存储有计算机程序,其特征在于，当所述计算机程序被处理器执行时，使得所述处理器执行如上所述的方法。
与现有技术相比，本申请的有益效果：
本申请提出一种继电保护冗余采样检测方法，包括：获取被测电压/电流分别经冗余采样后的采样值一和采样值二；根据采样值一和采样值二的瞬时值差、瞬时值和、二次电压/二次电流额定值进行冗余采样异常判别。本申请提供的技术方案能够快速判别冗余采样异常，进而快速闭锁无延时的速动段保护，防止继电保护装置不正确动作。
附图说明
图1是现有技术中本申请的采样回路示意图。
图2是本申请的一种继电保护冗余采样及异常判别方法的流程图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请的保护范围。
下面结合附图对本申请的应用原理作详细的描述。
实施例一：
如图1所示，本申请提供了一种继电保护冗余采样及异常判别的方法，包括以下步骤：
步骤1，继电保护装置设置前置冗余采样回路。
步骤2，获取被测电气量分别经冗余采样后的采样值一和采样值二。
步骤3，对采样值一和采样值二进行冗余采样异常判别。判别方法为：
a、计算采样值一和采样值二的瞬时值差及瞬时值和；
b、对判别条件一和判别条件二进行判定：
判别条件1，瞬时值差的绝对值是否大于第一预设值倍数的瞬时值和的绝对值；是，则判别条件1成立；
判别条件2，瞬时值差的绝对值是否大于第二预设值倍数的二次电压或二次电流额定值；是，则判别条件2成立；
若判别条件1和判别条件2均成立，则判定冗余采样异常。
其中，步骤3中判别条件1的具体公式为：
|A i(n)-A j(n)|＞α|A i(n)+A j(n)|
其中：A i(n)为采样值一的第n点瞬时值；A j(n)为采样值二的第n点瞬时值；α为第一预设值。
其中，步骤3中判别条件2的具体公式为：
|A i(n)-A j(n)|＞βA n
其中：A i(n)为采样值一的第n点瞬时值；A j(n)为采样值二的第n点瞬时值；β为第二预设值；A n为二次电压或二次电流额定值。
在可选的方案中，判定冗余采样异常后，闭锁冗余采样异常通道相对应的保护功能，并且发出采样异常报警信号。
本实施例中，判别条件1中的k取值0.2，判别条件2中的α取值0.3。
根据本申请的示例实施例，提供一种电子设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，当所述程序被所述处理器执行时，使得所述处理器执行如上所述的方法。
根据本申请的示例实施例，提供一种计算机可读存储介质，其上存储有计算机程序,其特征在于，当所述计算机程序被处理器执行时，使得所述处理器执行如上所述的方法。
以上实施例描述了本申请的基本原理和主要特征。本行业的技术人员应该了解，本申 请不受上述实施例的限制，上述实施例和说明书中的描述只是说明本申请的原理，在不脱离本申请精神和范围的前提下，本申请还会有各种变化和改进，这些变化和改进都落入要求保护的本申请范围内。本申请要求保护范围由所附的权利要求书及其等效物界定。

Claims (10)

  1. 一种继电保护冗余采样检测方法，包括：
    获取被测电压/电流分别经冗余采样后的采样值一和采样值二；
    根据采样值一和采样值二的瞬时值差、瞬时值和、二次电压/二次电流额定值进行冗余采样异常判别。
  2. 根据权利要求1所述的方法，所述冗余采样异常判别包括：
    计算采样值一和采样值二的瞬时值差及瞬时值和；
    对判别条件一和判别条件二进行判定：
    判别条件1，瞬时值差的绝对值是否大于第一预设值倍数的瞬时值和的绝对值；是，则判别条件1成立；
    判别条件2，瞬时值差的绝对值是否大于第二预设值倍数的二次电压或二次电流额定值；是，则判别条件2成立；
    若判别条件1和判别条件2均成立，则判定冗余采样异常。
  3. 根据权利要求2所述的方法，其特征在于，所述判别条件1的具体公式为：
    |A i(n)-A j(n)|＞α|A i(n)+A j(n)|
    其中：A i(n)为采样值一的第n点瞬时值；A j(n)为采样值二的第n点瞬时值；α为第一预设值。
  4. 根据权利要求2所述的方法，其特征在于，所述判别条件2的具体公式为：
    |A i(n)-A j(n)|＞βA n
    其中：A i(n)为采样值一的第n点瞬时值；A j(n)为采样值二的第n点瞬时值；β为第二预设值；A n为二次电压或二次电流额定值。
  5. 根据权利要求1或2所述的方法，进一步包括，判定冗余采样异常后，闭锁冗余采样异常通道相对应的保护功能。
  6. 根据权利要求1或2所述的方法，进一步包括，判定冗余采样异常后，发出采样异常报警信号。
  7. 一种继电保护方法，包括：
    继电保护装置设置前置冗余采样回路；
    获取被测电压/电流分别经冗余采样后的采样值一和采样值二；
    根据采样值一和采样值二的瞬时值差、瞬时值和、二次电压/二次电流额定值进行冗余采样异常判别；
    判定冗余采样异常后，闭锁冗余采样异常通道相对应的保护功能。
  8. 根据权利要求7所述的方法，所述冗余采样异常判别包括：
    若同时满足下面公式，则判定采样异常；
    公式1:|A i(n)-A j(n)|＞α|A i(n)+A j(n)|
    公式2:|A i(n)-A j(n)|＞βA n
    其中，A i(n)为采样值一的第n点瞬时值；A j(n)为采样值二的第n点瞬时值；α为第一预设值，β为第二预设值；A n为二次电压或二次电流额定值。
  9. 一种电子设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，其特征在于，当所述程序被所述处理器执行时，使得所述处理器执行如权利要求1至权利要求6之任一项所述的方法。
  10. 一种计算机可读存储介质，其上存储有计算机程序,其特征在于，当所述计算机程序被处理器执行时，使得所述处理器执行如权利要求1至权利要求6之任一项所述的方法。
PCT/CN2020/081449 2019-06-19 2020-03-26 一种继电保护冗余采样及异常判别的方法 Ceased WO2020253301A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910531843.7A CN110311349B (zh) 2019-06-19 2019-06-19 一种继电保护冗余采样及异常判别的方法
CN201910531843.7 2019-06-19

Publications (1)

Publication Number Publication Date
WO2020253301A1 true WO2020253301A1 (zh) 2020-12-24

Family

ID=68076533

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/081449 Ceased WO2020253301A1 (zh) 2019-06-19 2020-03-26 一种继电保护冗余采样及异常判别的方法

Country Status (2)

Country Link
CN (1) CN110311349B (zh)
WO (1) WO2020253301A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN121596720A (zh) * 2026-01-29 2026-03-03 东方电气自动控制工程有限公司 一种功率单元的冗余式通信控制系统及方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110311349B (zh) * 2019-06-19 2021-05-28 南京南瑞继保工程技术有限公司 一种继电保护冗余采样及异常判别的方法
CN113572576B (zh) * 2021-07-16 2022-07-29 南方电网数字电网研究院有限公司 采样数据校验方法、装置、继电保护装置和存储介质
CN114583657B (zh) * 2021-12-31 2023-12-22 国电南京自动化股份有限公司 提高单cpu双ad采样系统可靠性继电保护启动方法
CN117828233A (zh) * 2024-01-03 2024-04-05 南京国电南自电网自动化有限公司 一种提高过量保护元件可靠性的方法
CN118393938B (zh) * 2024-04-17 2026-04-17 南京南瑞继保电气有限公司 一种控制器对冗余i/o模块的数据处理方法、设备及存储介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102684151A (zh) * 2012-04-28 2012-09-19 辽宁省电力有限公司朝阳供电公司 双冗余a/d采样信号有效性判断方法及继电保护方法
CN104410042A (zh) * 2014-11-11 2015-03-11 许继集团有限公司 一种基于双ad采样的智能变电站继电保护方法
CN109001661A (zh) * 2018-05-31 2018-12-14 上海思源弘瑞自动化有限公司 双采样值的一致性确定方法、装置、终端设备及存储介质
US20190011499A1 (en) * 2015-12-28 2019-01-10 Michel Nicolaidis Highly efficient double-sampling architectures
CN110311349A (zh) * 2019-06-19 2019-10-08 南京南瑞继保工程技术有限公司 一种继电保护冗余采样及异常判别的方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102684145B (zh) * 2012-04-28 2014-04-23 辽宁省电力有限公司朝阳供电公司 基于冗余ct绕组的采样数据异常检测方法及继电保护方法
CN105510754A (zh) * 2016-01-22 2016-04-20 许昌许继软件技术有限公司 一种智能变电站中双ad采样不一致判断方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102684151A (zh) * 2012-04-28 2012-09-19 辽宁省电力有限公司朝阳供电公司 双冗余a/d采样信号有效性判断方法及继电保护方法
CN104410042A (zh) * 2014-11-11 2015-03-11 许继集团有限公司 一种基于双ad采样的智能变电站继电保护方法
US20190011499A1 (en) * 2015-12-28 2019-01-10 Michel Nicolaidis Highly efficient double-sampling architectures
CN109001661A (zh) * 2018-05-31 2018-12-14 上海思源弘瑞自动化有限公司 双采样值的一致性确定方法、装置、终端设备及存储介质
CN110311349A (zh) * 2019-06-19 2019-10-08 南京南瑞继保工程技术有限公司 一种继电保护冗余采样及异常判别的方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN121596720A (zh) * 2026-01-29 2026-03-03 东方电气自动控制工程有限公司 一种功率单元的冗余式通信控制系统及方法

Also Published As

Publication number Publication date
CN110311349A (zh) 2019-10-08
CN110311349B (zh) 2021-05-28

Similar Documents

Publication Publication Date Title
WO2020253301A1 (zh) 一种继电保护冗余采样及异常判别的方法
CN107765077B (zh) 一种励磁涌流识别方法及识别装置
US10551425B2 (en) Method for quickly identifying disconnection of CT in protection of 3/2 connection mode based bus
US10777992B2 (en) Method and protection device for monitoring circuit breaker in an electrical power supply network
CN110095688B (zh) Lcc-mmc混合三端直流输电系统故障检测方法和装置
CN105699842A (zh) 一种稳定控制装置所用的直流近区交流线路相间故障判据
US10103545B2 (en) Method and system for detecting islanding effect in power electrical network topology
CN118130973A (zh) 一种配电线路不对称故障判断方法及故障隔离方法
WO2016082593A1 (zh) 一种克服汲出电流对母线差动保护影响的方法
CN110401175A (zh) 一种继电保护冗余采样优化方法
CN106383292B (zh) 一种基于故障逃逸的电流互感器断线判别方法
CN109470991B (zh) 一种电力系统线路故障识别方法及系统
KR20240000800A (ko) 분산전원 연계 배전계통의 단선 및 단선 후 지락고장 복합검출 장치 및 그 방법
CN111725778B (zh) 潮流反向条件下的线路保护ct断线闭锁方法、系统及介质
WO2022144165A1 (en) Determination of residual flux in a power transformer
CN107887891A (zh) 防止交流电压采样异常导致直流闭锁的虚拟交流电压方法
CN114583657B (zh) 提高单cpu双ad采样系统可靠性继电保护启动方法
CN110780159A (zh) 一种单相接地故障选线方法
CN111781453B (zh) 一种基于故障时刻的直流系统换相失败风险评估方法
Yan et al. A hidden fault diagnosis method of relay protection considering the lack of sample synchronization
CN116794443A (zh) 特高压直流输电系统udm测点pt断线检测方法和装置
CN106410764A (zh) 一种正序极化电压的计算方法及装置
CN114094553A (zh) 输电系统的故障保护方法、装置、设备及输电系统
CN115047381B (zh) 三相四/五线逆变器n线丢失检测方法及其逆变器
CN119716390B (zh) 基于改进开关函数的换流器阀侧故障定位方法及系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20826033

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20826033

Country of ref document: EP

Kind code of ref document: A1