CN109031175A - A kind of zero-sequence current method of calibration - Google Patents
A kind of zero-sequence current method of calibration Download PDFInfo
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- 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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- zero
- sequence current
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- current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- 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
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. a kind of zero-sequence current method of calibration, it is characterised in that include the following steps:
Step 1, the action report of real-time detection line protective devices judges whether to start, detects line protective devices
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 step 2
The zero-sequence current sampled data of extraction 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 are calculated
The phase of self-produced zero-sequence current and external zero-sequence current, and execute step 5；
Step 5, it is judged according to the comparison result of step 4, proposes that maintenance is suggested.
2. a kind of zero-sequence current method of calibration as described in claim 1, it is characterised in that: in the step 1, hunting action report
" starting " keyword in text records the corresponding message moment, then contains in search file name in wave file list after finding
There is the wave file at this moment.
3. a kind of zero-sequence current method of calibration as described in claim 1, it is characterised in that: in the step 3, more self-produced zero
The amplitude of sequence electric current and external zero-sequence current is determined as amplitude not when the two phase absolute value of the difference, which is greater than first, compares threshold value
Unanimously；The phase of more self-produced zero-sequence current and external zero-sequence current compares threshold value when the two phase absolute value of the difference is greater than second
When, it is determined as that phase is inconsistent.
4. a kind of zero-sequence current method of calibration as claimed in claim 3, it is characterised in that: described first compares the range of threshold value
It is 1-5% times of route rated current, the described second range for comparing threshold value is 1-10 degree.
5. a kind of zero-sequence current method of calibration as described in claim 1, it is characterised in that: the particular content of the step 4 is:
If the amplitude of self-produced zero-sequence current and external zero-sequence current, phase are all identical, it is determined as that current loop is normal；If self-produced zero
Any difference of the amplitude of sequence electric current and external zero-sequence current, phase is judged to current loop exception, it is proposed that check external zero-sequence current
Circuit.
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| CN201810615670.2A CN109031175A (en) | 2018-06-14 | 2018-06-14 | A kind of zero-sequence current method of calibration |
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| CN201810615670.2A CN109031175A (en) | 2018-06-14 | 2018-06-14 | A kind of zero-sequence current method of calibration |
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Cited By (1)
| 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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| 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 |
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2018
- 2018-06-14 CN CN201810615670.2A patent/CN109031175A/en active Pending
Patent Citations (6)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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