CN106961096B - Relay protection constant value adjusting method - Google Patents
Relay protection constant value adjusting method Download PDFInfo
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- CN106961096B CN106961096B CN201710046643.3A CN201710046643A CN106961096B CN 106961096 B CN106961096 B CN 106961096B CN 201710046643 A CN201710046643 A CN 201710046643A CN 106961096 B CN106961096 B CN 106961096B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000035945 sensitivity Effects 0.000 claims abstract description 55
- 238000005457 optimization Methods 0.000 claims abstract description 6
- 238000012886 linear function Methods 0.000 claims description 9
- 238000009499 grossing Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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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
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a relay protection setting value adjusting method, and belongs to the technical field of relay protection of power systems. According to the invention, the sensitivity coefficient is subjected to smooth optimization processing, the relay protection setting value is verified, and the relay protection setting value is adjusted, so that the relay protection can act more quickly, and the possibility of enlarging the power failure range accident is reduced.
Description
Technical Field
The invention relates to the technical field of relay protection of power systems, in particular to a relay protection setting value adjusting method.
Background
Usually, the relay protection setting calculation needs fault calculation and can be obtained by matching with the setting coefficient, and the robustness can be improved by the aid of the protection constant value. Due to the online setting, the application range of each set of setting values is narrowed, namely, the considered extreme cases are reduced. Therefore, a certain optimization space is provided for the balance of various performances of the fixed value, namely, the original offline setting parameters can be properly adjusted.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem of how to adjust the relay protection fixed value so as to enable the relay protection to act more quickly and reduce the possibility of enlarging the power failure range. (II) technical scheme
In order to solve the technical problem, the invention provides a relay protection constant value adjusting method, which comprises the following steps:
s1, calculating a relay protection constant value by using the setting coefficient;
s2, smoothing the sensitivity coefficient to obtain an optimized sensitivity coefficient, wherein the sensitivity coefficient reflects the sensitivity degree of the response of the protection device when the protected object fails in the protection range of relay protection;
and S3, checking the calculated relay protection constant value by using the optimized sensitivity coefficient, comparing the optimized sensitivity coefficient with the sensitivity coefficient before optimization, wherein the optimized sensitivity coefficient is in a required range and more accords with the operation condition of the power grid, and adjusting the relay protection constant value according to the optimized sensitivity coefficient.
Preferably, step S2 is specifically: and (3) replacing a step function with a linear function, and recalculating the sensitivity coefficients so as to smoothen the sensitivity coefficients at two sides of the demarcation point.
Preferably, the relay protection fixed value comprises a differential protection fixed value, a distance protection fixed value and a zero sequence protection fixed value.
Preferably, if the relay protection fixed value is a zero sequence protection fixed value, the sensitive coefficient and the length of the line form the step function, and the sensitive coefficient at the end of the line in the case of a metallic ground fault meets the following requirements:
a.20km or less line, not less than 1.5;
b, 20-50 km of line, which is not less than 1.4;
c, a line more than 50km and not less than 1.3;
then the linear function is KlmA + BL, where L denotes the length of the line, and a and B are preset constants.
(III) advantageous effects
According to the invention, the sensitivity coefficient is subjected to smooth optimization processing, the relay protection setting value is verified, and the relay protection setting value is adjusted, so that the relay protection can act more quickly, and the possibility of enlarging the power failure range accident is reduced.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
As shown in fig. 1, an embodiment of the present invention provides a method for adjusting a relay protection setting value, including the following steps:
s1, calculating a relay protection constant value by using the setting coefficient;
and S2, smoothing the sensitivity coefficient to obtain the optimized sensitivity coefficient.
And the sensitivity coefficient reflects the sensitivity degree of the response of the protection device when the protected object breaks down in the protection range of the relay protection. Coefficient of sensitivity KlmMainly describes the ratio of the fault quantity to the whole quantity when a certain specified point of a protected object fails:
on the premise of ensuring the stable operation of the power grid, the larger the sensitivity coefficient is, the better the sensitivity coefficient is, however, in order to protect the reliable action, the lower limit value needs to be set for the sensitivity coefficient.
The relay protection fixed value comprises a differential protection fixed value, a distance protection fixed value and a zero sequence protection fixed value. For the zero sequence protection constant value, in order to ensure the full-length sensitivity coefficient of the whole line, the sensitivity coefficient of the line at the end metallic grounding fault meets the following requirements:
a.20km or less line, not less than 1.5;
b, 20-50 km of line, which is not less than 1.4;
c, more than 50km, not less than 1.3.
From the above requirement of the sensitivity coefficient, the sensitivity coefficient and the length of the line form a step function, which causes the sensitivity coefficient to change greatly at 20km and 50km of the line. I.e. when the line length is from 20-Variation is 20+When the sensitivity coefficient is changed, the original sensitivity coefficient has a step change from 1.5 to 1.4; when the line length is from 50-Becomes 50+The change of the sensitivity coefficient step is 1.4 to 1.3. Therefore, the length of the line is changed extremely little, and the sensitivity coefficient changes in a step mode, so that the sensitivity coefficient is unreasonable to a certain extent.
Therefore, in this step, a linear function is used instead of a step function, that is, the relation between the sensitivity coefficient and the length of the line is processed by applying a continuous linear function, and the sensitivity coefficient is recalculated, so that the sensitivity coefficients on both sides of the demarcation point become smooth. The linear function is KlmA + BL, where L denotes the length of the line, and a and B are preset constants.
In this example, when a is 1.6 and B is-0.002, formula K can be obtainedlm1.6-0.002L as in table 1.
TABLE 1 comparison of lower sensitivity limits
And S3, checking the calculated relay protection constant value by using the optimized sensitivity coefficient, comparing the optimized sensitivity coefficient with the sensitivity coefficient before optimization, finding that the optimized sensitivity coefficient is in a required range and more accords with the running condition of the power grid through a simulation experiment, and adjusting the relay protection constant value according to the optimized sensitivity coefficient.
In this embodiment, as can be seen from table 1, by using a linear function, the sensitivity lower limit coefficient is improved as a whole.
For the lines with the line lengths on the two sides of the step point, the lower sensitivity limit coefficient of the linear function ensures the continuity of the sensitivity coefficient, and the relay protection fixed value is adjusted by using the formula (1) according to the lower sensitivity limit coefficient within the required range, so that the online-set relay protection fixed value is more suitable for the change of the power grid structure.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A relay protection fixed value adjusting method is characterized by comprising the following steps:
s1, calculating a relay protection constant value by using the setting coefficient;
s2, smoothing the sensitivity coefficient to obtain an optimized sensitivity coefficient, wherein the sensitivity coefficient reflects the sensitivity degree of the response of the protection device when the protected object fails in the protection range of relay protection;
the method specifically comprises the following steps: replacing a step function with a linear function, and recalculating the sensitivity coefficients so as to smoothen the sensitivity coefficients at two sides of the demarcation point;
if the relay protection fixed value is a zero sequence protection fixed value, the sensitive coefficient and the length of the line form a step function, and the sensitive coefficient at the end of the line in the case of a metallic ground fault meets the following requirements:
a.20km or less line, not less than 1.5;
b, 20-50 km of line, which is not less than 1.4;
c, a line more than 50km and not less than 1.3;
then the linear function is KlmA + BL, where L denotes the length of the line, a and B are preset constants;
s3, checking the calculated relay protection fixed value by using the optimized sensitivity coefficient, comparing the optimized sensitivity coefficient with the sensitivity coefficient before optimization, wherein the optimized sensitivity coefficient is in a required range and more accords with the operation condition of a power grid, and adjusting the relay protection fixed value according to the optimized sensitivity coefficient, wherein the specific adjustment formula is as follows:
2. the method of claim 1, wherein the relay protection constants comprise a differential protection constant, a distance protection constant, and a zero sequence protection constant.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016110309627 | 2016-11-16 | ||
| CN201611030962 | 2016-11-16 |
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| CN106961096A CN106961096A (en) | 2017-07-18 |
| CN106961096B true CN106961096B (en) | 2020-01-03 |
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| CN201710046643.3A Active CN106961096B (en) | 2016-11-16 | 2017-01-19 | Relay protection constant value adjusting method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110399671B (en) * | 2019-07-19 | 2023-04-18 | 国网河北省电力有限公司邢台供电分公司 | Setting calculation method and device for relay protection device of power grid and terminal |
| CN111162506B (en) * | 2020-01-13 | 2022-02-18 | 华电国际电力股份有限公司邹县发电厂 | Double-speed motor protection measurement and control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280779A (en) * | 2013-04-19 | 2013-09-04 | 广东电网公司电力调度控制中心 | Auditing processing method for relay protection setting value |
| CN104410035A (en) * | 2014-12-03 | 2015-03-11 | 国家电网公司 | Method for checking relay protection setting value |
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- 2017-01-19 CN CN201710046643.3A patent/CN106961096B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280779A (en) * | 2013-04-19 | 2013-09-04 | 广东电网公司电力调度控制中心 | Auditing processing method for relay protection setting value |
| CN104410035A (en) * | 2014-12-03 | 2015-03-11 | 国家电网公司 | Method for checking relay protection setting value |
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