CN105738751A - Setting calculation method for bus differential protection current loop line disconnection alarm fixed value - Google Patents
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Abstract
本发明公开了一种母线差动保护电流回路断线告警定值的整定计算方法，解决了由于现有变电站母线差动保护电流回路断线告警定值整定不合理，导致变电站母线保护的电流回路断线告警信号频繁发生的技术难题。本发明首先是根据变电站同一母线联接的所有输电线路使用塔型及导线相序排列和线路长度，建立输电线路的不平衡电流计算模型，计算出每回输电线路的正、负、零序电流以及零序电流不平衡度。在变电站投入运行后对所有输电线路的二次零序不平衡电流进行实测；最后根据零序电流不平衡度是否大于5%，对母线差动保护的电流回路断线告警定值进行整定。本发明克服了变电站的母线保护电流回路断线告警信号频繁动作，保障了电网的安全运行。The invention discloses a setting calculation method for the broken line alarm setting value of the bus differential protection current loop, which solves the current loop of the substation bus protection caused by the unreasonable setting of the broken line alarm setting value of the existing bus differential protection current loop. The technical problem of frequent disconnection alarm signals. The present invention firstly establishes the unbalanced current calculation model of the transmission line according to the use of tower type, phase sequence arrangement and line length of all transmission lines connected to the same busbar of the substation, and calculates the positive, negative and zero-sequence currents of each transmission line and Zero sequence current unbalance. After the substation is put into operation, the secondary zero-sequence unbalanced current of all transmission lines is measured; finally, according to whether the zero-sequence current unbalanced degree is greater than 5%, the current loop disconnection alarm setting value of the bus differential protection is adjusted. The invention overcomes the frequent action of the disconnection alarm signal of the bus protection current loop of the substation, and ensures the safe operation of the power grid.
Description
技术领域technical field
本发明涉及一种变电站母线差动保护电流回路断线告警定值的整定方法，适用于变电站母线联接多回输电线路的母线差动保护电流回路断线告警定值的整定计算，使变电站母线差动保护电流回路断线时能够可靠准确地发出告警信号。The invention relates to a method for setting the disconnection alarm setting value of the bus differential protection current loop of a substation, which is suitable for the setting calculation of the disconnection alarm setting value of the bus differential protection current loop connected to the multi-circuit transmission line of the substation bus, so that the substation bus differential It can reliably and accurately send out an alarm signal when the dynamic protection current loop is disconnected.
背景技术Background technique
随着电网的发展，根据电网负荷的不同需求，电网中出现大量的短距离不换位架设的输电线路，这些短距离输电线路的不换位架设（或不完全换位），使三相电流不平衡度加剧，导致变电站的母线保护电流回路断线告警频繁发生，影响到了电网的安全运行。究其原因：一是按照输电线路的设计要求，在输电线路全线长度小于100公里时不进行换位，由于不换位短线路数量增多，导致了输电线路参数不对称，进而造成输电线路三相电流不平衡；二是在整定母差保护电流回路断线告警定值时，仅考虑了电流互感器的不同型号，并未考虑输电线路的空载电容电流和输电线路导线相序排列导致的零序不平衡电流。以上原因导致了母线差动保护中电流回路断线告警信号频繁发生，为保证母线差动保护中电流回路断线告警信号的准确可靠地发出，需要对其整定定值的影响因素进行全面分析，重新确定其整定计算方法。With the development of the power grid, according to the different needs of the grid load, a large number of short-distance transmission lines erected without transposition appear in the power grid. The non-transposition erection (or incomplete transposition) of these short-distance transmission lines makes the three-phase current The aggravation of the unbalance has led to the frequent occurrence of disconnection alarms of the busbar protection current loop of the substation, which has affected the safe operation of the power grid. The reasons are as follows: First, according to the design requirements of the transmission line, transposition is not performed when the entire length of the transmission line is less than 100 kilometers. Due to the increase in the number of short lines without transposition, the parameters of the transmission line are asymmetrical, resulting in a three-phase transmission line. The second is that when setting the busbar differential protection current loop disconnection alarm setting, only the different types of current transformers are considered, and the no-load capacitive current of the transmission line and the zero caused by the phase sequence arrangement of the transmission line conductors are not considered. sequence unbalanced current. The above reasons lead to the frequent occurrence of the current loop disconnection alarm signal in the bus differential protection. In order to ensure the accurate and reliable sending of the current loop disconnection alarm signal in the bus differential protection, it is necessary to conduct a comprehensive analysis of the influencing factors of its setting value. Re-determine its setting calculation method.
发明内容Contents of the invention
本发明提供了一种变电站母线差动保护电流回路断线告警定值的整定计算方法，解决了由于现有变电站母线差动保护电流回路断线告警定值整定不合理，导致变电站母线保护的电流回路断线告警信号频繁发生的技术难题。The invention provides a setting calculation method for the disconnection alarm setting value of the differential protection current loop of the substation busbar, which solves the current problem caused by the unreasonable setting of the disconnection alarm setting value of the current loop differential protection current circuit of the substation busbar. The technical problem of frequent occurrence of loop disconnection alarm signals.
本发明是通过以下技术方案解决以上技术问题的：The present invention solves the above technical problems through the following technical solutions:
一种母线差动保护电流回路断线告警定值的整定计算方法，包括以下步骤：A method for setting and calculating a disconnection alarm setting value of a bus differential protection current loop, comprising the following steps:
第一步、将变电站同一母线所联接的N回输电线路进行排序，将第一回输电线路的参数用下标I表示，将第二回输电线路的参数用下标II表示，以此类推，第N回输电线路的参数用下标N表示；The first step is to sort the N-circuit transmission lines connected to the same busbar of the substation. The parameters of the first transmission line are represented by the subscript I, and the parameters of the second transmission line are represented by the subscript II, and so on. The parameters of the Nth transmission line are represented by the subscript N;
第二步、根据变电站同一母线所联接的各回输电线路的实际线路长度、所使用的塔型和输电线路的导线相序排列，分别建立各回输电线路的不平衡电流计算模型；The second step is to establish the unbalanced current calculation model of each transmission line according to the actual line length of each transmission line connected to the same busbar of the substation, the tower type used and the phase sequence arrangement of the conductors of the transmission line;
第三步、根据第二步所建立的第I回输电线路的不平衡电流计算模型，计算出第I回输电线路的正序电流II 1、负序电流II 2、零序电流II 0；The third step is to calculate the positive sequence current I I 1 , negative sequence current I I 2 and zero sequence current I I of the first circuit transmission line according to the unbalanced current calculation model of the I circuit transmission line established in the second step 0 ;
第四步、根据第II回、第III回…第N回输电线路的不平衡电流计算模型，计算出第II回、第III回…第N回输电线路的正序、负序和零序电流；The fourth step is to calculate the positive sequence, negative sequence and zero sequence currents of the II, III...Nth transmission line according to the unbalanced current calculation model of the II, III...N transmission line ;
第五步、利用以下公式计算出第I、II、…N回输电线路的零序电流不平衡度：The fifth step is to use the following formula to calculate the zero-sequence current unbalance degree of the I, II, ... N circuit transmission lines:
； ;
； ;
……
； ;
、…为第I、II、…N回输电线路的零序电流不平衡度； , … is the zero-sequence current unbalance degree of the I, II, ... N transmission lines;
第六步、在变电站投入运行后，对第I、II、…N回输电线路的空载二次零序电流进行实测，测得的结果记为、、…；Step 6. After the substation is put into operation, the no-load secondary zero-sequence current of the I, II, ... N transmission lines is actually measured, and the measured results are recorded as , ,… ;
、、…为第I、II、…N回输电线路的空载二次零序电流； , ,… is the no-load secondary zero-sequence current of the I, II, ... N transmission lines;
第七步、若第I、II、…N回输电线路中的m回输电线路的零序电流不平衡度为，则该线路的母线保护的电流回路断线告警信号的零序电流定值按照下式进行整定确定：The seventh step, if the zero-sequence current unbalance degree of the m-circuit transmission lines in the I, II, ... N-circuit transmission lines is , then the zero-sequence current setting value of the current loop disconnection alarm signal of the busbar protection of the line is set and determined according to the following formula:
=0.25×+0.04++×； =0.25× +0.04 + + x ;
为m回线路母线保护电流回路断线告警信号的零序电流定值； It is the zero-sequence current setting value of the m-circuit line busbar protection current loop disconnection alarm signal;
为m回线路最大相电流的二次值； is the secondary value of the maximum phase current of m circuits;
为m回线路电流互感器二次额定电流； is the secondary rated current of m circuit current transformer;
为m回输电线路空载二次实测零序电流； is the secondary measured zero-sequence current of the m-circuit transmission line without load;
为m回输电线路零序电流不平衡度； is the zero-sequence current unbalance degree of the m-circuit transmission line;
为m回输电线路二次正序电流。 is the secondary positive-sequence current of the m-circuit transmission line.
如上述的一种母线差动保护电流回路断线告警定值的整定计算方法，其中的第七步，若第I、II、…N回输电线路中的m回输电线路的零序电流不平衡度超过5%，则该线路的母线保护的电流回路断线告警信号的零序电流定值按照下式进行整定确定：Such as the above-mentioned setting calculation method for the disconnection alarm setting value of the current loop of the bus differential protection, in the seventh step, if the zero-sequence current of the m-circuit transmission lines in the I, II, ... N-circuit transmission lines is unbalanced Spend If it exceeds 5%, the zero-sequence current setting value of the current loop disconnection alarm signal of the busbar protection of this line shall be set and determined according to the following formula:
=0.25×+0.04++×； =0.25× +0.04 + + x ;
为m回线路母线保护电流回路断线告警信号的零序电流定值； It is the zero-sequence current setting value of the m-circuit line busbar protection current loop disconnection alarm signal;
为m回线路最大相电流的二次值； is the secondary value of the maximum phase current of m circuits;
为m回线路电流互感器二次额定电流； is the secondary rated current of m circuit current transformer;
为m回输电线路空载二次实测零序电流； is the secondary measured zero-sequence current of the m-circuit transmission line without load;
为m回输电线路零序电流不平衡度； is the zero-sequence current unbalance degree of the m-circuit transmission line;
为m回输电线路二次正序电流。 is the secondary positive-sequence current of the m-circuit transmission line.
本发明解决了现有的变电站母线保护电流回路断线告警信号的零序电流定值不合理导致信号频繁报警的问题，为变电站母线保护电流回路断线告警信号提供了一种可靠的整定计算方法，克服了变电站的母线保护电流回路断线告警信号频繁动作，保障了电网的安全运行。The present invention solves the problem that the unreasonable zero-sequence current setting of the existing substation busbar protection current loop disconnection alarm signal causes frequent signal alarms, and provides a reliable setting calculation method for the substation busbar protection current loop disconnection alarm signal , Overcoming the frequent action of the busbar protection current loop disconnection alarm signal of the substation, and ensuring the safe operation of the power grid.
具体实施方式detailed description
下面对本发明进行详细说明：The present invention is described in detail below:
一种母线差动保护电流回路断线告警定值的整定计算方法，包括以下步骤：A method for setting and calculating a disconnection alarm setting value of a bus differential protection current loop, comprising the following steps:
第一步、将变电站同一母线所联接的N回输电线路进行排序，将第一回输电线路的参数用下标I表示，将第二回输电线路的参数用下标II表示，以此类推，第N回输电线路的参数用下标N表示；The first step is to sort the N-circuit transmission lines connected to the same busbar of the substation. The parameters of the first transmission line are represented by the subscript I, and the parameters of the second transmission line are represented by the subscript II, and so on. The parameters of the Nth transmission line are represented by the subscript N;
第二步、根据变电站同一母线所联接的各回输电线路的实际线路长度、所使用的塔型和输电线路的导线相序排列，分别建立各回输电线路的不平衡电流计算模型；The second step is to establish the unbalanced current calculation model of each transmission line according to the actual line length of each transmission line connected to the same busbar of the substation, the tower type used and the phase sequence arrangement of the conductors of the transmission line;
第三步、根据第二步所建立的第I回输电线路的不平衡电流计算模型，计算出第I回输电线路的正序电流II 1、负序电流II 2、零序电流II 0；The third step is to calculate the positive sequence current I I 1 , negative sequence current I I 2 and zero sequence current I I of the first circuit transmission line according to the unbalanced current calculation model of the I circuit transmission line established in the second step 0 ;
第四步、根据第II回、第III回…第N回输电线路的不平衡电流计算模型，计算出第II回、第III回…第N回输电线路的正序、负序和零序电流；The fourth step is to calculate the positive sequence, negative sequence and zero sequence currents of the II, III...Nth transmission line according to the unbalanced current calculation model of the II, III...N transmission line ;
第五步、利用以下公式计算出第I、II、…N回输电线路的零序电流不平衡度：The fifth step is to use the following formula to calculate the zero-sequence current unbalance degree of the I, II, ... N circuit transmission lines:
； ;
； ;
……
； ;
、…为第I、II、…N回输电线路的零序电流不平衡度； , … is the zero-sequence current unbalance degree of the I, II, ... N transmission lines;
第六步、在变电站投入运行后，对第I、II、…N回输电线路的空载二次零序电流进行实测，测得的结果记为、、…；Step 6. After the substation is put into operation, the no-load secondary zero-sequence current of the I, II, ... N transmission lines is actually measured, and the measured results are recorded as , ,… ;
、、…为第I、II、…N回输电线路的空载二次零序电流； , ,… is the no-load secondary zero-sequence current of the I, II, ... N transmission lines;
第七步、若第I、II、…N回输电线路中的m回输电线路的零序电流不平衡度为，则该线路的母线保护的电流回路断线告警信号的零序电流定值按照下式进行整定确定：The seventh step, if the zero-sequence current unbalance degree of the m-circuit transmission lines in the I, II, ... N-circuit transmission lines is , then the zero-sequence current setting value of the current loop disconnection alarm signal of the busbar protection of the line is set and determined according to the following formula:
=0.25×+0.04++×； =0.25× +0.04 + + x ;
为m回线路母线保护电流回路断线告警信号的零序电流定值； It is the zero-sequence current setting value of the m-circuit line busbar protection current loop disconnection alarm signal;
为m回线路最大相电流的二次值； is the secondary value of the maximum phase current of m circuits;
为m回线路电流互感器二次额定电流； is the secondary rated current of m circuit current transformer;
为m回输电线路空载二次实测零序电流； is the secondary measured zero-sequence current of the m-circuit transmission line without load;
为m回输电线路零序电流不平衡度； is the zero-sequence current unbalance degree of the m-circuit transmission line;
为m回输电线路二次正序电流。 is the secondary positive-sequence current of the m-circuit transmission line.
上述的第七步，若第I、II、…N回输电线路中的m回输电线路的零序电流不平衡度超过5%，则该线路的母线保护的电流回路断线告警信号的零序电流定值按照下式进行整定确定：In the seventh step above, if the zero-sequence current unbalance of the m-circuit transmission lines in the I, II, ... N-circuit transmission lines If it exceeds 5%, the zero-sequence current setting value of the current loop disconnection alarm signal of the busbar protection of this line shall be set and determined according to the following formula:
=0.25×+0.04++×； =0.25× +0.04 + + x ;
为m回线路母线保护电流回路断线告警信号的零序电流定值； It is the zero-sequence current setting value of the m-circuit line busbar protection current loop disconnection alarm signal;
为m回线路最大相电流的二次值； is the secondary value of the maximum phase current of m circuits;
为m回线路电流互感器二次额定电流； is the secondary rated current of m circuit current transformer;
为m回输电线路空载二次实测零序电流； is the secondary measured zero-sequence current of the m-circuit transmission line without load;
为m回输电线路零序电流不平衡度； is the zero-sequence current unbalance degree of the m-circuit transmission line;
为m回输电线路二次正序电流。 is the secondary positive-sequence current of the m-circuit transmission line.
本发明首先是根据变电站同一母线联接的所有输电线路使用塔型及导线相序排列和线路长度，建立输电线路的不平衡电流计算模型，计算出每回输电线路的正、负、零序电流以及零序电流不平衡度。在变电站投入运行后对所有输电线路的二次零序不平衡电流进行实测；最后根据零序电流不平衡度是否大于5%，对母线差动保护的电流回路断线告警定值进行整定。The present invention firstly establishes the unbalanced current calculation model of the transmission line according to the use of tower type, phase sequence arrangement and line length of all transmission lines connected to the same busbar of the substation, and calculates the positive, negative and zero-sequence currents of each transmission line and Zero sequence current unbalance. After the substation is put into operation, the secondary zero-sequence unbalanced current of all transmission lines is measured; finally, according to whether the zero-sequence current unbalanced degree is greater than 5%, the current loop disconnection alarm setting value of the bus differential protection is adjusted.
输电线路零序电流不平衡度的计算方法，是利用了电磁暂态计算法，每条输电线路的正、负、零序电流计算方法如下：The calculation method of the zero-sequence current unbalance degree of the transmission line is to use the electromagnetic transient calculation method. The calculation method of the positive, negative and zero-sequence current of each transmission line is as follows:
……；...;
其中：为矢量运算因子；in: is a vector operation factor;
零序电流不平衡度计算公式为：The calculation formula of zero-sequence current unbalance degree is:
零序电流不平衡度=（零序电流/正序电流）×100%。Zero-sequence current unbalance = (zero-sequence current/positive-sequence current) × 100%.
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| CN107121614A (en) * | 2017-03-29 | 2017-09-01 | 国家电网公司 | A method for measuring the polarity of current loops in dual transformation of busbar protection |
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| US11143715B2 (en) * | 2019-08-15 | 2021-10-12 | Schweitzer Engineering Laboratories, Inc. | Broken conductor detection in a multiple-phase electric power delivery system |
| US12153079B2 (en) | 2022-04-18 | 2024-11-26 | Schweitzer Engineering Laboratories, Inc. | Identifying conductor breaks by detecting series arcing |
| US12362556B2 (en) | 2023-03-07 | 2025-07-15 | Schweitzer Engineering Laboratories, Inc. | Single-ended broken conductor detection logic using incremental quantities |
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| CN107121614A (en) * | 2017-03-29 | 2017-09-01 | 国家电网公司 | A method for measuring the polarity of current loops in dual transformation of busbar protection |
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| US11143715B2 (en) * | 2019-08-15 | 2021-10-12 | Schweitzer Engineering Laboratories, Inc. | Broken conductor detection in a multiple-phase electric power delivery system |
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| CN113013877B (en) * | 2021-03-05 | 2024-03-12 | 国网安徽省电力有限公司黄山供电公司 | Loop-closing transfer method between 35kV lines under phase difference conditions |
| US12153079B2 (en) | 2022-04-18 | 2024-11-26 | Schweitzer Engineering Laboratories, Inc. | Identifying conductor breaks by detecting series arcing |
| US12362556B2 (en) | 2023-03-07 | 2025-07-15 | Schweitzer Engineering Laboratories, Inc. | Single-ended broken conductor detection logic using incremental quantities |
| US12461171B2 (en) | 2023-11-07 | 2025-11-04 | Schweitzer Engineering Laboratories, Inc. | Single phase broken conductor detection |
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