CN110401175A - A kind of relay protection redundancy sampling optimization method - Google Patents
A kind of relay protection redundancy sampling optimization method Download PDFInfo
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- CN110401175A CN110401175A CN201910531844.1A CN201910531844A CN110401175A CN 110401175 A CN110401175 A CN 110401175A CN 201910531844 A CN201910531844 A CN 201910531844A CN 110401175 A CN110401175 A CN 110401175A
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of relay protection redundancy sampling optimization methods, comprising the following steps: 3 groups of sampling circuits are arranged in step 1, protective relaying device；Step 2 obtains tested the electrical quantity sampled value 1 after redundancy sampling, sampled value 2 and sampled value 3 respectively；Step 3 carries out consistency discrimination to every two groups of sampled values in sampled value 1, sampled value 2 and sampled value 3 respectively；Step 4, according to the differentiation of step 3 as a result, calculating the final sampled value of tested electrical quantity.In one group of sampling circuit exception, using the sample values of another 2 groups of sampling circuits, the probability of protective relaying device latch-up protection function is substantially reduced, the reliability of protective relaying device is improved.In addition, the present invention carries out comparison of coherence to the instantaneous value of sampled value, can quick discrimination redundancy sampling it is abnormal, prevent protective relaying device incorrect operation.
Description
Technical field
The invention belongs to field of relay protection in power, and in particular to a kind of relay protection redundancy sampling optimization method.
Background technique
Power system relay protection device is when the electrical component in electric system breaks down or irregular operating, fastly
Automatic device that is fast and accurately making circuit breaker trip or sending signal.
Protective relaying device acquires AC analogue voltage, the magnitude of current by acquisition module.It is inputted per ac analog all the way
It is equipped with sampling circuit, including amplifier, frequency overlapped-resistable filter and an A/D converter, analog quantity is converted into digital quantity, then
To processor.Due to sampling circuit component wear etc., causes sampling abnormal, seriously affect the reliability of relay protection.
For the reliability for improving relay protection system, the sampling of the protective relaying device applied to voltage levels power grid is returned
Road uses redundancy structure；Purpose is when single element failure occurring in sampling circuit, and equipment can promptly and accurately judge hardware event
Barrier avoids the breaker actuation order for issuing mistake.
Application No. is 201810547244.X, entitled " consistency of double sampled value determines method, apparatus, terminal
In the Chinese invention patent of equipment and storage medium ", the consistency for disclosing a kind of double sampled value determines method, determines that first adopts
After sample value and the second sampled value are inconsistent, it is latched the first sampled value and the corresponding protection exit of the second sampled value.
2 groups of sampling circuits are arranged in protective relaying device, and when wherein 1 group of sampling circuit exception, 2 groups of sampled values are inconsistent,
The probability of protective relaying device latch-up protection function is higher.If 3 groups of sampling circuits are arranged in protective relaying device, 3 groups of samplings are returned
Road carries out consistency discrimination respectively, then the probability of protective relaying device latch-up protection function substantially reduces, and improves relay protection dress
The reliability set.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes a kind of relay protection redundancy sampling optimization method, 3 groups of sampling circuits are adopted
The instantaneous value of sample value carries out consistency discrimination, calculates the final sampled value of tested electrical quantity.
In order to achieve the above technical purposes, reach above-mentioned technical effect, the invention is realized by the following technical scheme:
A kind of relay protection redundancy sampling optimization method, comprising the following steps:
3 groups of sampling circuits are arranged in step 1, protective relaying device；
Step 2 obtains sampled value 1, sampled value 2 and sampled value of the tested electrical quantity respectively after 3 groups of sampling circuits sample
3；
Step 3 carries out consistency discrimination to every two groups of sampled values in sampled value 1, sampled value 2 and sampled value 3 respectively；
Step 4, according to the differentiation of step 3 as a result, calculating the final sampled value of tested electrical quantity.
Further, in step 3, the method for every two groups of sampled values progress consistency discrimination specifically:
Step 31, calculate two groups of sampled values instantaneous value difference and instantaneous value and；
Step 32, criterion one and criterion two are determined:
Whether criterion one, instantaneous value absolute value of the difference are greater than the absolute value of the instantaneous value sum of the first preset value multiple；
It is that then criterion one is set up；
Whether criterion two, instantaneous value absolute value of the difference are greater than the secondary voltage or secondary current of the second preset value multiple
Rated value；It is that then criterion two is set up；
If criterion one and criterion two are set up simultaneously, determines that two groups of sampled values are inconsistent, otherwise determine two groups
Sampled value is consistent.
Further, in step 4, according to the differentiation of step 3 as a result, calculating the side of the final sampled value of tested electrical quantity
Method are as follows:
If a, three groups of sampled values are compared two-by-two is all satisfied consistency, the final sampled value of tested electrical quantity is three groups and adopts
The average value of sample value；
If b, in three groups of sampled values, thering are two groups to meet consistency, another set is not satisfied consistent with other sampled values
Property, then the final sampled value for being tested electrical quantity is the average value for meeting two groups of sampled values of consistency；
If c, in three groups of sampled values, wherein one group is compared with other two groups and is all satisfied consistency, and other two groups are compared
It is unsatisfactory for consistency, then the corresponding defencive function of relay protection locking sampling channel；
If d, three groups of sampled values are compared two-by-two is not satisfied consistency, it is corresponding that relay protection is latched sampling channel
Defencive function.
Further, the specific formula of the criterion one are as follows:
|Ai(n)-Aj(n)|>α|Ai(n)+Aj(n)|
Wherein: Ai(n) the nth point instantaneous value for being sampled value i；Aj(n) the nth point instantaneous value for being sampled value j；α is first pre-
If value.
Further, the specific formula of the criterion two are as follows:
|Ai(n)-Aj(n)|>βAn
Wherein: Ai(n) the nth point instantaneous value for being sampled value i；Aj(n) the nth point instantaneous value for being sampled value j；β is second pre-
If value；AnFor secondary voltage or secondary current rated value.
Further, further include in the step b protective relaying device be simultaneously emitted by it is discontented with other two groups of sampled values
The another set sampled value of sufficient consistency samples abnormal alarm signal.
Further, sampling abnormal alarm letter is issued while relay protection locking sampling channel corresponding defencive function
Number.
Compared with prior art, beneficial effects of the present invention:
In technical solution of the present invention, 3 groups of sampling circuits are arranged in protective relaying device, respectively to every in 3 groups of sampled values
The instantaneous value of two groups of sampled values carries out consistency discrimination, and according to differentiation as a result, calculating the final sampled value of tested electrical quantity.In
When one group of sampling circuit exception, the present invention uses the sample values of another 2 groups of sampling circuits, substantially reduces protective relaying device and closes
The probability for locking defencive function, improves the reliability of protective relaying device.In addition, the present invention carries out unanimously the instantaneous value of sampled value
Property compare, can quick discrimination redundancy sampling it is abnormal, prevent protective relaying device incorrect operation.
Detailed description of the invention
Fig. 1 is a kind of flow chart of relay protection redundancy sampling optimization method；
Fig. 2 is a kind of final method for processing sampling value of relay protection redundancy sampling optimization method.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
It limits the scope of protection of the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
Embodiment one:
It is a kind of flow chart of relay protection redundancy sampling optimization method shown in Fig. 1, the embodiment of the present invention one provides
A kind of relay protection redundancy sampling optimization method, comprising the following steps:
3 groups of sampling circuits are arranged in step 1, protective relaying device.
Step 2 obtains sampled value 1, sampled value 2 and sampled value of the tested electrical quantity respectively after 3 groups of sampling circuits sample
3。
Step 3 carries out consistency discrimination to every two groups of sampled values in sampled value 1, sampled value 2 and sampled value 3 respectively.
Wherein, the method that every two groups of sampled values carry out consistency discrimination specifically:
Step 31, calculate two groups of sampled values instantaneous value difference and instantaneous value and；
Step 32, criterion one and criterion two are determined:
Whether criterion one, instantaneous value absolute value of the difference are greater than the absolute value of the instantaneous value sum of the first preset value multiple；
It is that then criterion one is set up；
Whether criterion two, instantaneous value absolute value of the difference are greater than the secondary voltage or secondary current of the second preset value multiple
Rated value；It is that then criterion two is set up；
If criterion one and criterion two are set up simultaneously, determines that two groups of sampled values are inconsistent, otherwise determine two groups
Sampled value is consistent.
Step 4, according to the differentiation of step 3 as a result, calculating the final sampled value of tested electrical quantity.Specific method includes:
If a, three groups of sampled values are compared two-by-two is all satisfied consistency, the final sampled value of tested electrical quantity is three groups and adopts
The average value of sample value.
If b, in three groups of sampled values, thering are two groups to meet consistency, another set is not satisfied consistent with other sampled values
Property, then the final sampled value for being tested electrical quantity is the average value for meeting two groups of sampled values of consistency；Preferably, relay protection fills
It sets the another set sampled value for being also simultaneously emitted by and consistency being not satisfied with other two groups of sampled values and samples abnormal alarm signal.
If c, in three groups of sampled values, wherein one group is compared with other two groups and is all satisfied consistency, and other two groups are compared
It is unsatisfactory for consistency, then the corresponding defencive function of relay protection locking sampling channel.Preferably, relay protection locking sampling is logical
Sampling abnormal alarm signal is issued while the corresponding defencive function in road.
If d, three groups of sampled values are compared two-by-two is not satisfied consistency, it is corresponding that relay protection is latched sampling channel
Defencive function.Preferably, sampling abnormal alarm letter is issued while relay protection locking sampling channel corresponding defencive function
Number.
Embodiment two
The embodiment of the present invention two provides a kind of relay protection redundancy sampling optimization method, comprising the following steps:
3 groups of sampling circuits are arranged in S1, protective relaying device；
S2 obtains sampled value 1, sampled value 2 and sampled value 3 of the tested electrical quantity respectively after 3 groups of sampling circuits sample；
S3 carries out consistency discrimination to every two groups of sampled values in sampled value 1, sampled value 2 and sampled value 3 respectively.
Whether the instantaneous value absolute value of the difference of criterion one, sampled value i and sampled value j are greater than the first preset value multiple
The absolute value of the instantaneous value sum of sampled value i and sampled value j；
|Ai(n)-Aj(n)|>α|Ai(n)+Aj(n)|
Wherein: Ai(n) the nth point instantaneous value for being sampled value i；Aj(n) the nth point instantaneous value for being sampled value j；α is first pre-
If value.
Whether the instantaneous value absolute value of the difference of criterion two, sampled value i and sampled value j are greater than the second preset value multiple
Secondary voltage or secondary current rated value；
|Ai(n)-Aj(n)|>βAn
Wherein: Ai(n) the nth point instantaneous value for being sampled value i；Aj(n) the nth point instantaneous value for being sampled value j；β is second pre-
If value；AnFor secondary voltage or secondary current rated value.
If criterion one and criterion two are set up simultaneously, determines that sampled value i and sampled value j are inconsistent, otherwise sentence
It is consistent with sampled value j to determine sampled value i.
Wherein, i=1 or 2 or 3, j=1 or 2 or 3, and i ≠ j.
Preferably, the α value 0.2 in criterion one, the β value 0.3 in criterion two.
S4, according to the differentiation of step 3 as a result, calculating the final sampled value of tested electrical quantity, as shown in Figure 2.
(1) if sampled value i is consistent with sampled value j, sampled value i is consistent with sampled value k, and sampled value j is consistent with sampled value k,
The final sampled value for being then tested electrical quantity is the average value of sampled value i, sampled value j and sampled value k；
(2) if sampled value i is consistent with sampled value j, sampled value i and sampled value k are inconsistent, and sampled value j and sampled value k are different
It causes, then the final sampled value for being tested electrical quantity is the average value of sampled value i, sampled value j；Protective relaying device issues sampled value k
Sample abnormal alarm signal.
(3) if sampled value i is consistent with sampled value j, sampled value i is consistent with sampled value k, and sampled value j and sampled value k are different
It causes, relay protection is latched the corresponding defencive function of sampling channel, and issues sampling abnormal alarm signal.
(4) if sampled value i and sampled value j are inconsistent, sampled value i and sampled value k are inconsistent, and sampled value j and sampled value k are not
Unanimously, the corresponding defencive function of relay protection locking sampling channel, and issue sampling abnormal alarm signal.
Wherein, i=1 or 2 or 3, j=1 or 2 or 3, k=1 or 2 or 3, and i ≠ j, i ≠ k, j ≠ k.
Embodiment above describes basic principles and main features of the invention.It should be understood by those skilled in the art that
The present invention is not limited to the above embodiments, and the description in above embodiments and description merely illustrates the principles of the invention, In
Without departing from the spirit and scope, various changes and improvements may be made to the invention, these changes and improvements are all fallen
Enter in scope of the claimed invention.The scope of the present invention is defined by the appended claims and its equivalents.
Claims (7)
1. a kind of relay protection redundancy sampling optimization method, which comprises the following steps:
3 groups of sampling circuits are arranged in step 1, protective relaying device；
Step 2 obtains sampled value 1, sampled value 2 and sampled value 3 of the tested electrical quantity respectively after 3 groups of sampling circuits sample；
Step 3 carries out consistency discrimination to every two groups of sampled values in sampled value 1, sampled value 2 and sampled value 3 respectively；
Step 4, according to the differentiation of step 3 as a result, calculating the final sampled value of tested electrical quantity.
2. a kind of relay protection redundancy sampling optimization method according to claim 1, which is characterized in that in step 3, institute
State the method that every two groups of sampled values carry out consistency discrimination specifically:
Step 31, calculate two groups of sampled values instantaneous value difference and instantaneous value and；
Step 32, criterion one and criterion two are determined:
Whether criterion one, instantaneous value absolute value of the difference are greater than the absolute value of the instantaneous value sum of the first preset value multiple；It is, then
Criterion one is set up；
Criterion two, instantaneous value absolute value of the difference whether be greater than the second preset value multiple secondary voltage or secondary current it is specified
Value；It is that then criterion two is set up；
If criterion one and criterion two are set up simultaneously, determines that two groups of sampled values are inconsistent, otherwise determine two groups of samplings
Value is consistent.
3. a kind of relay protection redundancy sampling optimization method according to claim 1, which is characterized in that in step 4, root
According to the differentiation of step 3 as a result, the method for calculating the final sampled value of tested electrical quantity are as follows:
If a, three groups of sampled values are compared two-by-two is all satisfied consistency, the final sampled value for being tested electrical quantity is three groups of sampled values
Average value；
If b, in three groups of sampled values, thering are two groups to meet consistency, consistency is not satisfied in another set and other sampled values, then
The final sampled value of tested electrical quantity is the average value for meeting two groups of sampled values of consistency；
If c, in three groups of sampled values, wherein one group is compared with other two groups and is all satisfied consistency, and other two groups compared to discontented
Sufficient consistency, then relay protection is latched the corresponding defencive function of sampling channel；
If d, three groups of sampled values are compared two-by-two is not satisfied consistency, relay protection is latched the corresponding protection of sampling channel
Function.
4. a kind of relay protection redundancy sampling optimization method according to claim 2, which is characterized in that the criterion
One specific formula are as follows:
|Ai(n)-Aj(n)|>α|Ai(n)+Aj(n)|
Wherein: Ai(n) the nth point instantaneous value for being sampled value i；Aj(n) the nth point instantaneous value for being sampled value j；α is first default
Value.
5. a kind of relay protection redundancy sampling optimization method according to claim 2, which is characterized in that the criterion
Two specific formula are as follows:
|Ai(n)-Aj(n)|>βAn
Wherein: Ai(n) the nth point instantaneous value for being sampled value i；Aj(n) the nth point instantaneous value for being sampled value j；β is second default
Value；AnFor secondary voltage or secondary current rated value.
6. a kind of relay protection redundancy sampling optimization method according to claim 3, which is characterized in that in the step b
It further include that protective relaying device is simultaneously emitted by the another set sampled value sampling that consistency is not satisfied with other two groups of sampled values
Abnormal alarm signal.
7. a kind of relay protection redundancy sampling optimization method according to claim 3, which is characterized in that relay protection locking
Sampling abnormal alarm signal is issued while sampling channel corresponding defencive function.
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Cited By (2)
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| CN111025048A (en) * | 2019-11-25 | 2020-04-17 | 深圳供电局有限公司 | Automatic comparison system based on protection device operation data |
| CN113572576A (en) * | 2021-07-16 | 2021-10-29 | 南方电网数字电网研究院有限公司 | Sampling data verification method and device, relay protection device and storage medium |
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Application publication date: 20191101 |