CN106208000A - The saturated split-phase of heterogeneous CT and door blocking method outside a kind of homodyne protection zone - Google Patents
The saturated split-phase of heterogeneous CT and door blocking method outside a kind of homodyne protection zone Download PDFInfo
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- CN106208000A CN106208000A CN201610838295.9A CN201610838295A CN106208000A CN 106208000 A CN106208000 A CN 106208000A CN 201610838295 A CN201610838295 A CN 201610838295A CN 106208000 A CN106208000 A CN 106208000A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention discloses the outer saturated split-phase of heterogeneous CT in a kind of homodyne protection zone and door blocking method, including step 1, outside each split-phase whether district, CT is saturated to utilize phase segregated differential protection to differentiate respectively；Step 2, result is differential with door locking zero sequence to utilize all split-phases in step 1 to differentiate.The present invention can carry out locking to zero sequence is differential time heterogeneous CT is saturated outside district accurately and reliably, prevents malfunction, simultaneously it is suitable in the district outside single-phase CT saturated, there is general applicability, simple and reliable, be not required to by the new complicated criterion of increase and adnexa logic.
Description
Technical field
The present invention relates to a kind of blocking method, be specifically related to the saturated split-phase of heterogeneous CT and door locking outside a kind of homodyne protection zone
Method.
Background technology
Owing to the sensitivity when single-phase high resistance ground of zero sequence differential protection is higher, protect at tranformer protection, route protection etc.
Zero sequence differential protection all it is configured with as main protection in protecting.But zero sequence differential protection by external area error CT saturated affect relatively big,
When especially three-phase CT is saturated, owing to the three-phase CT saturated moment is different, meeting sustainable existence zero sequence difference stream during external area error, at one
Continuous print indifference stream region is there is not in power frequency period, so based on the most general CT saturated locking criterion: differentiate difference stream even
In continuous data window region, indifference flow point number cannot carry out the saturated locking of external area error to zero sequence is differential.Zero sequence differential protection is only at present
Consider that outside district, single-phase CT is saturated, can be in the saturated method that carry out locking differential to zero sequence of the heterogeneous CT of external area error.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides the saturated split-phase of heterogeneous CT outside a kind of homodyne protection zone and close with door
Locking method.
In order to achieve the above object, the technical solution adopted in the present invention is:
Outside a kind of homodyne protection zone, the saturated split-phase of heterogeneous CT and door blocking method, comprise the following steps,
Step 1, outside each split-phase whether district, CT is saturated to utilize phase segregated differential protection to differentiate respectively；
Step 2, result is differential with door locking zero sequence to utilize all split-phases in step 1 to differentiate.
Use and synchronize to identify or the saturated method of discrimination such as community indifference stream, it determines outside each split-phase whether district, CT is saturated.
Phase-splitting difference stream is not up to poor stream and starts threshold, then to be directly judged to CT outside district saturated for this phase.
The beneficial effect that the present invention is reached: the present invention can accurately and reliably outside district heterogeneous CT poor to zero sequence time saturated
Dynamic carry out locking, prevent malfunction, simultaneously it is suitable for outside district single-phase CT saturated, there is general applicability, simple and reliable,
It is not required to increasing new complicated criterion and adnexa logic.
Accompanying drawing explanation
Fig. 1 is the logic chart of the present invention.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.Following example are only used for clearly illustrating the present invention
Technical scheme, and can not limit the scope of the invention with this.
As it is shown in figure 1, the outer saturated split-phase of heterogeneous CT in a kind of homodyne protection zone and door blocking method, comprise the following steps:
Step 1, outside each split-phase whether district, CT is saturated to utilize phase segregated differential protection to differentiate respectively.
Owing to phase segregated differential protection and zero sequence differential protection share protective current, but the differential split-phase of split-phase calculates difference stream, because of
This is saturated at heterogeneous CT, even if the most serious three-phase CT is saturated, the differential each phase of split-phase will not persistently have difference stream, exists continuously
Indifference stream region, so all can CT outside this phase whether generating region saturated and the most unaffected by sentencing the most respectively.
The outer saturated differentiation of CT of each phase-separating section has two kinds of methods:
The first, use saturated method of discrimination such as synchronizing identification or community indifference stream, it determines whether occurs CT saturated, will if saturated
Saturated mark puts 1, otherwise sets to 0；
The second, phase-splitting difference stream is not up to poor stream and starts threshold, then to be directly judged to CT outside district saturated for this phase.
The outer saturated method of discrimination of CT of phase-separating section can be saturated criterion outside community indifference stream criterion or other district.
Step 2, result is differential with door locking zero sequence to utilize all split-phases in step 1 to differentiate, i.e. A phase CT is saturated differentiates knot
Guo &&B phase CT saturated differentiation Jie Guo &&C phase CT saturated differentiation result, three-phase and door result go locking zero sequence differential, can be accurate
Reliably carry out locking to zero sequence is differential, prevent malfunction.
Said method can carry out locking to zero sequence is differential time heterogeneous CT is saturated outside district accurately and reliably, prevents malfunction,
Outside the method is also applied for district simultaneously, single-phase CT is saturated, has general applicability, simple and reliable, is not required to sentence by the new complexity of increase
According to adnexa logic.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and deformation, these improve and deformation
Also should be regarded as protection scope of the present invention.
Claims (3)
1. the saturated split-phase of heterogeneous CT and door blocking method outside a homodyne protection zone, it is characterised in that: comprise the following steps,
Step 1, outside each split-phase whether district, CT is saturated to utilize phase segregated differential protection to differentiate respectively；
Step 2, result is differential with door locking zero sequence to utilize all split-phases in step 1 to differentiate.
The saturated split-phase of heterogeneous CT and door blocking method outside a kind of homodyne protection zone the most according to claim 1, its feature exists
In: use and synchronize to identify or the saturated method of discrimination such as community indifference stream, it determines outside each split-phase whether district, CT is saturated.
The saturated split-phase of heterogeneous CT and door blocking method outside a kind of homodyne protection zone the most according to claim 1, its feature exists
Be not up to poor stream in: phase-splitting difference stream and start threshold, then to be directly judged to CT outside district saturated for this phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610838295.9A CN106208000B (en) | 2016-09-22 | 2016-09-22 | Multiphase CT saturation split-phase and door blocking method outside a kind of homodyne protection zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610838295.9A CN106208000B (en) | 2016-09-22 | 2016-09-22 | Multiphase CT saturation split-phase and door blocking method outside a kind of homodyne protection zone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106208000A true CN106208000A (en) | 2016-12-07 |
| CN106208000B CN106208000B (en) | 2019-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610838295.9A Active CN106208000B (en) | 2016-09-22 | 2016-09-22 | Multiphase CT saturation split-phase and door blocking method outside a kind of homodyne protection zone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110737A (en) * | 2017-11-28 | 2018-06-01 | 酒泉钢铁(集团)有限责任公司 | 6-10kV isolated neutral system casing zero sequence optical differential protective relaying devices |
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| CN101051742A (en) * | 2007-02-14 | 2007-10-10 | 田伟 | Anti-TA satuation method for protecting line differential action |
| CN101777753A (en) * | 2010-01-13 | 2010-07-14 | 华中电网有限公司 | Multi-component recombination current flashy flow judgment method of transformer and block relay |
| CN104319905A (en) * | 2014-11-19 | 2015-01-28 | 国家电网公司 | Quick self-healing system of power distribution network |
| US20150160297A1 (en) * | 2012-06-06 | 2015-06-11 | Abb Technology Ltd. | Method for identifying the fault by current differential protection and device thereof |
| CN105140893A (en) * | 2015-07-27 | 2015-12-09 | 许继集团有限公司 | Differential protection current transformer (CT) saturation recognition method |
-
2016
- 2016-09-22 CN CN201610838295.9A patent/CN106208000B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051742A (en) * | 2007-02-14 | 2007-10-10 | 田伟 | Anti-TA satuation method for protecting line differential action |
| CN101777753A (en) * | 2010-01-13 | 2010-07-14 | 华中电网有限公司 | Multi-component recombination current flashy flow judgment method of transformer and block relay |
| US20150160297A1 (en) * | 2012-06-06 | 2015-06-11 | Abb Technology Ltd. | Method for identifying the fault by current differential protection and device thereof |
| CN104319905A (en) * | 2014-11-19 | 2015-01-28 | 国家电网公司 | Quick self-healing system of power distribution network |
| CN105140893A (en) * | 2015-07-27 | 2015-12-09 | 许继集团有限公司 | Differential protection current transformer (CT) saturation recognition method |
Non-Patent Citations (1)
| Title |
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| 伍叶凯: "利用故障分量的分相式电流差动保护", 《继电器》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110737A (en) * | 2017-11-28 | 2018-06-01 | 酒泉钢铁(集团)有限责任公司 | 6-10kV isolated neutral system casing zero sequence optical differential protective relaying devices |
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| CN106208000B (en) | 2019-03-19 |
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