CN109031175A - A kind of zero-sequence current method of calibration - Google Patents

A kind of zero-sequence current method of calibration Download PDF

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Publication number
CN109031175A
CN109031175A CN201810615670.2A CN201810615670A CN109031175A CN 109031175 A CN109031175 A CN 109031175A CN 201810615670 A CN201810615670 A CN 201810615670A CN 109031175 A CN109031175 A CN 109031175A
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China
Prior art keywords
sequence current
zero
phase
self
external
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Pending
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CN201810615670.2A
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Chinese (zh)
Inventor
陈庆
吕航
陆晓
朱晓彤
吴奕
刘东超
崔玉
杜云龙
熊蕙
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State Grid Jiangsu Electric Power Co Ltd
NR Electric Co Ltd
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State Grid Jiangsu Electric Power Co Ltd
NR Electric Co Ltd
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Priority to CN201810615670.2A priority Critical patent/CN109031175A/en
Publication of CN109031175A publication Critical patent/CN109031175A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/005Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references

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  • Emergency Protection Circuit Devices (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)

Abstract

The present invention discloses a kind of zero-sequence current method of calibration; step is: the action report of real-time detection line protective devices; judge whether to start; detect that line protective devices start; read the recorded wave file at corresponding moment; the sampled data that route phase current and zero-sequence current are extracted from recorded wave file, calculates separately self-produced zero-sequence current amplitude and phase, external zero-sequence current amplitude and phase;The amplitude of more self-produced zero-sequence current and external zero-sequence current, the phase of more self-produced zero-sequence current and external zero-sequence current, judges according to comparison result, proposes that maintenance is suggested.Such zero-sequence current method of calibration can effectively identify external zero-sequence current circuit with the presence or absence of exception, improve the reliability of external zero-sequence current sampling, improve safe effect.

Description

A kind of zero-sequence current method of calibration
Technical field
The invention belongs to technical field of relay protection, in particular to a kind of zero-sequence current method of calibration.
Background technique
Currently, circuit relay protection device needs to acquire external zero-sequence current in relay protection system.But normally Electric system does not have zero-sequence current when operation, thus can not directly judge whether external zero-sequence current circuit is normal.If external Zero-sequence current circuit is abnormal, and ground fault once occurs for electric system at this time, and protective relaying device will be unable to measurement zero-sequence current, It may cause relay fail, be current urgent problem.
Summary of the invention
The purpose of the present invention is to provide a kind of zero-sequence current method of calibration, can effectively identify external zero sequence electricity Road is flowed back to the presence or absence of exception, the reliability of external zero-sequence current sampling is improved, improves safe effect.
In order to achieve the above objectives, solution of the invention is:
A kind of zero-sequence current method of calibration, includes the following steps:
Step 1, the action report of real-time detection line protective devices judges whether to start, detects route protection Device starting, reads the recorded wave file at corresponding moment, and executes step 2;
Step 2, the sampled data of route phase current and zero-sequence current is extracted from recorded wave file, and executes step 3;
Step 3, the sampled data of the phase current extracted according to step 2 calculates self-produced zero-sequence current amplitude and phase, according to The zero-sequence current sampled data that step 2 is extracted calculates external zero-sequence current amplitude and phase, and executes step 4;
Step 4, the amplitude of comparison step 3 calculated self-produced zero-sequence current and external zero-sequence current, comparison step 3 calculate The phase of self-produced zero-sequence current and external zero-sequence current out, and execute step 5;
Step 5, it is judged according to the comparison result of step 4, proposes that maintenance is suggested.
In above-mentioned steps 1, " starting " keyword in hunting action message records the corresponding message moment, then after finding Contain the wave file at this moment in search file name in wave file list.
In above-mentioned steps 3, the amplitude of more self-produced zero-sequence current and external zero-sequence current, when the two phase absolute value of the difference is big When first compares threshold value, it is determined as that amplitude is inconsistent;The phase of more self-produced zero-sequence current and external zero-sequence current, works as the two When phase absolute value of the difference compares threshold value greater than second, it is determined as that phase is inconsistent.
Above-mentioned first range for comparing threshold value is 1-5% times of route rated current, and described second compares the range of threshold value For 1-10 degree.
The particular content of above-mentioned steps 4 is: if the amplitude of self-produced zero-sequence current and external zero-sequence current, phase all phases Together, it is determined as that current loop is normal;If any difference of the amplitude of self-produced zero-sequence current and external zero-sequence current, phase, is judged to Current loop is abnormal, it is proposed that checks external zero-sequence current circuit.
After adopting the above scheme, compared with prior art, the present invention external zero-sequence current circuit can effectively be identified With the presence or absence of exception, the reliability of external zero-sequence current sampling is improved, safe effect is improved, has a good application prospect.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention and beneficial effect are described in detail.
The present invention provides a kind of zero-sequence current method of calibration, as shown in Figure 1, comprising the following steps:
Step (A), the action report of real-time detection line protective devices judge whether to start, and detect that route is protected Protection unit starting, reads the recorded wave file at corresponding moment, and executes step (B);If detecting, line protective devices are inactive, It repeats step (A), starts to verify next time;
In step (A), " starting " keyword in hunting action message records the corresponding message moment, then after finding Contain the wave file at this moment in search file name in wave file list;
Step (B), extracts the sampled data of route phase current and zero-sequence current from recorded wave file, and executes step (C);
Step (C) calculates self-produced zero-sequence current amplitude and phase according to the sampled data of step (B) phase current extracted, External zero-sequence current amplitude and phase are calculated according to the zero-sequence current sampled data that step (B) is extracted, and executes step (D);
Step (D), the amplitude of comparison step (C) calculated self-produced zero-sequence current and external zero-sequence current, comparison step (C) phase of calculated self-produced zero-sequence current and external zero-sequence current, and execute step (E);
In the step (D), the amplitude and phase of more self-produced zero-sequence current and external zero-sequence current, process is as follows:
(D1) amplitude of more self-produced zero-sequence current and external zero-sequence current, when the two phase absolute value of the difference is greater than the first ratio When compared with threshold value, it is determined as that amplitude is inconsistent, the described first range for comparing threshold value is 1-5% times of route rated current;
(D2) phase of more self-produced zero-sequence current and external zero-sequence current, when the two phase absolute value of the difference is greater than the second ratio When compared with threshold value, it is determined as that phase is inconsistent, the described second range for comparing threshold value is 1-10 degree;
Step (E) is judged according to the comparison result of step (D), proposes that maintenance suggests that steps are as follows:
(E1) if the amplitude of self-produced zero-sequence current and external zero-sequence current, phase are all identical, it is determined as current loop just Often;
(E2) if any difference of the amplitude of self-produced zero-sequence current and external zero-sequence current, phase, it is different to be judged to current loop Often, it is proposed that check external zero-sequence current circuit.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention Within.

Claims (5)

1.一种零序电流校验方法,其特征在于包括如下步骤:1. A zero-sequence current checking method is characterized in that comprising the steps: 步骤1,实时检测线路保护装置的动作报告,判断是否发生启动,检测到线路保护装置启动,读取对应时刻的录波文件,并执行步骤2;Step 1, detect the action report of the line protection device in real time, judge whether it is activated, detect the activation of the line protection device, read the wave recording file at the corresponding time, and execute step 2; 步骤2,从录波文件中提取线路相电流以及零序电流的采样数据,并执行步骤3;Step 2, extract the sampling data of line phase current and zero-sequence current from the wave recording file, and execute step 3; 步骤3,根据步骤2提取的相电流的采样数据计算自产零序电流幅值和相位,根据步骤2提取的零序电流采样数据计算外接零序电流幅值和相位,并执行步骤4;Step 3, calculate the amplitude and phase of the self-produced zero-sequence current according to the sampling data of the phase current extracted in step 2, calculate the amplitude and phase of the external zero-sequence current according to the sampling data of the zero-sequence current extracted in step 2, and perform step 4; 步骤4,比较步骤3计算出的自产零序电流和外接零序电流的幅值,比较步骤3计算出的自产零序电流和外接零序电流的相位,并执行步骤5;Step 4, compare the magnitude of the self-produced zero-sequence current and the external zero-sequence current calculated in step 3, compare the phases of the self-produced zero-sequence current and the external zero-sequence current calculated in step 3, and perform step 5; 步骤5,根据步骤4的比较结果做出判断,提出检修建议。Step 5, make a judgment based on the comparison result in step 4, and put forward maintenance suggestions. 2.如权利要求1所述的一种零序电流校验方法,其特征在于:所述步骤1中,搜索动作报文中的“启动”关键字,找到后记录对应报文时刻,然后在波形文件列表中搜索文件名中含有此时刻的波形文件。2. A kind of zero-sequence current checking method as claimed in claim 1, is characterized in that: in described step 1, search " start " keyword in the action message, record corresponding message time after finding, then in In the wave file list, search for wave files whose file name contains this moment. 3.如权利要求1所述的一种零序电流校验方法,其特征在于:所述步骤3中,比较自产零序电流和外接零序电流的幅值,当二者相差的绝对值大于第一比较阈值时,判定为幅值不一致;比较自产零序电流和外接零序电流的相位,当二者相差的绝对值大于第二比较阈值时,判定为相位不一致。3. A kind of zero-sequence current checking method as claimed in claim 1, is characterized in that: in described step 3, compare the amplitude value of self-produced zero-sequence current and external zero-sequence current, when the absolute value of the difference between the two When it is greater than the first comparison threshold, it is determined that the amplitude is inconsistent; when comparing the phases of the self-produced zero-sequence current and the external zero-sequence current, when the absolute value of the difference between the two is greater than the second comparison threshold, it is determined that the phase is inconsistent. 4.如权利要求3所述的一种零序电流校验方法,其特征在于:所述第一比较阈值的范围为线路额定电流的1-5%倍,所述第二比较阈值的范围为1-10度。4. A kind of zero-sequence current checking method as claimed in claim 3, is characterized in that: the scope of described first comparison threshold is 1-5% times of line rated current, the scope of described second comparison threshold is 1-10 degrees. 5.如权利要求1所述的一种零序电流校验方法,其特征在于:所述步骤4的具体内容是:如果自产零序电流和外接零序电流的幅值、相位都相同,判定为电流回路正常;如果自产零序电流和外接零序电流的幅值、相位任一不同,判为电流回路异常,建议检查外接零序电流回路。5. A kind of zero-sequence current checking method as claimed in claim 1, is characterized in that: the specific content of described step 4 is: if the amplitude and phase of the self-produced zero-sequence current and the external zero-sequence current are the same, It is judged that the current loop is normal; if the amplitude and phase of the self-produced zero-sequence current and the external zero-sequence current are different, it is judged that the current loop is abnormal, and it is recommended to check the external zero-sequence current loop.
CN201810615670.2A 2018-06-14 2018-06-14 A kind of zero-sequence current method of calibration Pending CN109031175A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110061481A (en) * 2019-03-28 2019-07-26 李晓明 A kind of zero-sequence voltage injection method and device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963964A (en) * 1975-02-07 1976-06-15 Westinghouse Electric Corporation Segregated phase comparison system
CN104122485A (en) * 2014-07-23 2014-10-29 国网天津市电力公司 Recording file based line fault analysis
CN105005014A (en) * 2015-07-07 2015-10-28 南京国电南自电网自动化有限公司 Merging unit with protection current transformer output abnormity detection function
CN105305391A (en) * 2015-11-18 2016-02-03 国网甘肃省电力公司定西供电公司 Protection action evaluation method
CN205811531U (en) * 2016-07-22 2016-12-14 广东电网有限责任公司揭阳供电局 Fault protection system for power distribution system
CN107315128A (en) * 2016-04-26 2017-11-03 国网辽宁省电力有限公司大连供电公司 A kind of distributed earthing wire-selecting method and system based on GOOSE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963964A (en) * 1975-02-07 1976-06-15 Westinghouse Electric Corporation Segregated phase comparison system
CN104122485A (en) * 2014-07-23 2014-10-29 国网天津市电力公司 Recording file based line fault analysis
CN105005014A (en) * 2015-07-07 2015-10-28 南京国电南自电网自动化有限公司 Merging unit with protection current transformer output abnormity detection function
CN105305391A (en) * 2015-11-18 2016-02-03 国网甘肃省电力公司定西供电公司 Protection action evaluation method
CN107315128A (en) * 2016-04-26 2017-11-03 国网辽宁省电力有限公司大连供电公司 A kind of distributed earthing wire-selecting method and system based on GOOSE
CN205811531U (en) * 2016-07-22 2016-12-14 广东电网有限责任公司揭阳供电局 Fault protection system for power distribution system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110061481A (en) * 2019-03-28 2019-07-26 李晓明 A kind of zero-sequence voltage injection method and device

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Application publication date: 20181218