CN107579506A - The recognition methods of TA abnormalities in multiple differential protection and device - Google Patents
The recognition methods of TA abnormalities in multiple differential protection and device Download PDFInfo
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- CN107579506A CN107579506A CN201710652015.XA CN201710652015A CN107579506A CN 107579506 A CN107579506 A CN 107579506A CN 201710652015 A CN201710652015 A CN 201710652015A CN 107579506 A CN107579506 A CN 107579506A
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Abstract
The present invention relates to a kind of recognition methods of the TA abnormalities in protection positioned at multiple differential and device, including：Judge whether any differential protection in the multiple differential protection that TA is located at starts；If all differential protections are not actuated, following condition is judged：a：This side three-phase zero-sequence current is more than the multiple differential determined by the reference current of the TA each differential protections being located at and protects reference current；b：Any one phase phase current of this side three-phase is less than setting without stream threshold value；If condition a and b are satisfied by, judge TA exceptions, produce TA exception messages.The present invention is when the multiple differential protection that TA is located at is not actuated; the TA abnormal conditions are judged by curent change situation; single message is produced if TA is abnormal; without being judged in each specific differential protection; TA exception decision logics are optimized, reduces the extremely caused message numbers of TA, saves cpu resource; and realization principle is simple, meet reality.
Description
Technical field
The present invention relates to the recognition methods of the TA abnormalities in being protected positioned at multiple differential and device, belong to power system
Technical field of relay protection.
Background technology
At present, the identification of TA abnormalities is mostly set according to some specific differential protection in transformer differential loop
Put, such as the TA abnormalities identification of transformer ratio brake type differential protection is divided into high pressure side end TA exceptions, low pressure side
Portion TA is abnormal, and the TA abnormalities identification of high-pressure side winding differential protection is divided into high pressure side end TA exceptions, high-pressure side afterbody TA
It is abnormal, if transformer ratio brake type differential protection and high-pressure side winding differential protection are realized in same device, for
High pressure side end TA is abnormal, and device can produce two messages, is " differential protection high pressure side end TA is abnormal " respectively and " winding is poor
Dynamic protection high pressure side end TA is abnormal ".If same TA configures more differential protections, the extremely caused messages of the TA can be more
It is more, CPU resource is not only wasted, and easily caused confusion to operations staff.
The content of the invention
It is an object of the invention to provide it is a kind of positioned at multiple differential protection in TA abnormalities recognition methods and device,
For solve positioned at multiple differential protection in TA exceptions when produce message it is more, not only waste cpu resource and also easily to
Operations staff causes confusion this technical problem.
In order to solve the above technical problems, the invention provides a kind of knowledge of the TA abnormalities in protection positioned at multiple differential
Other method, step are as follows：
Judge whether any differential protection in the multiple differential protection that TA is located at starts；
If all differential protections are not actuated, following condition is judged：
Condition a：This side three-phase zero-sequence current is more than determined by the reference current of the TA each differential protections being located at
Multiple differential protects reference current；
Condition b：Any one phase phase current of this side three-phase is less than setting without stream threshold value；
If condition above a and b are satisfied by, judge TA exceptions, TA exception messages are produced, without what is be located in TA
Individually judged in each specific differential protection.
Further, the multiple differential protection reference current is equal to the reference current for each differential protection that the TA is located at
K times of maximum, 0<k<1.
Further, described phase current is required to be multiplied by the extremely special coefficients of balance of side differentiation TA；The side differentiates
Coefficient of balance extremely special TA is the maximum of the coefficient of balance of public side TA each differential protection.
Further, the scope without stream threshold value is 30~60mA.
Further, whether the total differential protection starting element for the multiple differential protection being located at according to TA, which acts judgement, is appointed
Whether one differential protection starts, if total differential protection starting element action, judges that at least a kind of differential protection starts；It is no
Then, judge that all differential protections are not actuated.
Further, total differential protection starting element includes steady-state quantity starting element and transient starting element, if
Any one starting element acts, then judges that total differential protection starting element starts.
Present invention also offers a kind of identification device of the TA abnormalities in protection positioned at multiple differential, including memory
And processor, the instruction of the execution following steps of the processor processing storage in memory：
Judge whether any differential protection in the multiple differential protection that TA is located at starts；
If all differential protections are not actuated, following condition is judged：
Condition a：This side three-phase zero-sequence current is more than determined by the reference current of the TA each differential protections being located at
Multiple differential protects reference current；
Condition b：Any one phase phase current of this side three-phase is less than setting without stream threshold value；
If condition above a and b are satisfied by, judge TA exceptions, TA exception messages are produced, without what is be located in TA
Individually judged in each specific differential protection.
Further, the multiple differential protection reference current is equal to the reference current for each differential protection that the TA is located at
K times of maximum, 0<k<1.
Further, described phase current is required to be multiplied by the extremely special coefficients of balance of side differentiation TA；The side differentiates
Coefficient of balance extremely special TA is the maximum of the coefficient of balance of public side TA each differential protection.
Further, whether the total differential protection starting element for the multiple differential protection being located at according to TA, which acts judgement, is appointed
Whether one differential protection starts, if total differential protection starting element action, judges that at least a kind of differential protection starts；It is no
Then, judge that all differential protections are not actuated.
The beneficial effects of the invention are as follows：
When all differential protections in the multiple differential protection that TA is located at are not actuated, pass through curent change situation pair
The TA abnormal conditions are judged, single message is produced if TA is abnormal, without being carried out in each specific differential protection
Judge, not only optimize TA exception decision logics, reduce the extremely caused message numbers of TA, save cpu resource, and in fact
Existing principle is simple, meets reality.
Brief description of the drawings
Fig. 1 is the configuration schematic diagram of transformer differential protection；
Fig. 2 is that total differential protection starting element realizes block diagram；
Fig. 3 is that multiple differential protection reference current realizes block diagram；
Fig. 4 is that TA exception special balancing coefficients realize block diagram.
Embodiment
Below in conjunction with the accompanying drawings and the embodiment of the present invention is described in detail specific embodiment.
Fig. 1 gives the configuration schematic diagram of certain transformer differential protection, and the matched transformer is equipped with big poor protection, small difference is protected
Shield, source side winding is differential, valve star side winding is differential, pilot differential and zero sequence are differential.Wherein, it is used in various differential protections
Current transformer TA is as shown in Table 1 below.
Table 1
If using TA as research object, same TA is configured with different differential protections.By taking TA1 as an example, big poor protection and
Pilot differential all uses the TA1.It is provided by the present invention to be protected positioned at multiple differential for the TA in being protected positioned at multiple differential
In the recognition methods of TA abnormalities comprise the following steps：
The first step, judges whether any differential protection in the multiple differential protection that TA is located at starts.
, can be according to the total differential guarantor for the multiple differential protection that TA is located at when judging whether multiple differential protection starts
Whether shield starting element is acted as the distinguishing rule for judging any differential protection and whether starting, if always differential protection starting element
Action, then judge that at least a kind of differential protection starts；Otherwise, it is determined that all differential protections are not actuated.Fig. 2 gives always
Differential protection starting element realizes block diagram, i.e., total poor when the starting element action in involved any differential protection
Dynamic protection starting element action.
It should be noted that signified total differential protection starting element includes steady-state quantity starting element herein and transient opens
Dynamic element, if any one starting element acts, judge that total differential protection starting element starts, total differential protection starting element
Put 1.
Second step, the startup situation that the multiple differential being located at according to TA is protected, in two kinds of situation to the abnormal shape of the TA
State is identified.
Situation one：If any differential protection starts, following condition is judged：
Condition A：An at least phase phase current is constant in this side three-phase phase current；
Condition B：Any one phase phase current of this side three-phase is less than setting without stream threshold value；
If condition above A and B are satisfied by, judge TA exceptions, TA exception messages are produced, without what is be located in TA
Individually judged in each specific differential protection.
Situation two：If all differential protections are not actuated, following condition is judged：
Condition a：This side three-phase zero-sequence current is more than determined by the reference current of the TA each differential protections being located at
Multiple differential protects reference current；
Condition b：Any one phase phase current of this side three-phase is less than setting without stream threshold value；
If condition above a and b are satisfied by, judge TA exceptions, TA exception messages are produced, without what is be located in TA
Individually judged in each specific differential protection.
Specifically, the above-mentioned scope without stream threshold value is 30~60mA (including endpoint value).Multiple differential protection benchmark electricity
Stream is equal to k times of the maximum of the reference current for each differential protection that the TA is located at, and wherein k is the positive reality less than 1 more than 0
Number.By taking the TA1 of lead one as an example, TA1 multiple differential protection reference current is that (TA is extremely special using reference current by the TA1 of lead one
With) realize block diagram as shown in figure 3, choosing the maximum of big poor protection reference current and pilot differential reference current multiplied by with k
Times, obtain the TA1 of lead one and use reference current (TA is extremely special).
Above each phase current involved by Rule of judgment A, B, a, b in two kinds of situations is required to be multiplied by side differentiation TA
Abnormal special coefficient of balance, Fig. 4 realize block diagram for TA exception special balancing coefficients, as shown in Figure 4：TA exception special balancings
Coefficient is the maximum of the coefficient of balance of public side TA each differential protection.It is with the coefficient of balance of lead one (TA is extremely special)
Example, the maximum for choosing the big poor protection coefficient of balance of lead one and the coefficient of balance of pilot differential lead one are as the balance of lead one
Number (TA is extremely special).
After the action of total differential protection starting element, if meeting the abnormal differentiations of TA, in order to avoid differential protection malfunction, remove
Outside the warning information for sending " TA is abnormal ", it is also necessary to which locking uses broken string TA differential protection.But stream of being on duty is more than a certain
After setting definite value (the setting definite value is mainly used to simulate difference stream caused by catastrophe failure), the alarm letter of " TA is abnormal " is only sent
Breath, no longer locking use broken string TA differential protection, to avoid differential protection tripping.
The recognition methods of TA abnormalities in the protection provided by the present invention positioned at multiple differential is simple and easy, not only may be used
To differentiate the single-phase wire break in TA loops, multiphase broken string, when can also differentiate certain phase current broken string, electric current does not have what is be fully disconnected
Situation, it can more differentiate that the secondary circuit of TA sides biphase current occurs short circuit or touched by mistake, the situation that biphase current diminishes simultaneously.
In addition, present invention also offers a kind of identification device of the TA abnormalities in protection positioned at multiple differential, the knowledge
Other device includes memory and processor, the instruction of the execution following steps of processor processing storage in memory：
Judge whether any differential protection in the multiple differential protection that TA is located at starts；
If all differential protections are not actuated, following condition is judged：
Condition a：This side three-phase zero-sequence current is more than determined by the reference current of the TA each differential protections being located at
Multiple differential protects reference current；
Condition b：Any one phase phase current of this side three-phase is less than setting without stream threshold value；
If condition above a and b are satisfied by, judge TA exceptions, TA exception messages are produced, without what is be located in TA
Individually judged in each specific differential protection.
The identification device for being located at the TA abnormalities in multiple differential protection comes real indeed through computer instruction
The recognition methods of TA abnormalities in the existing above-mentioned protection positioned at multiple differential, due to the TA being pointed in multiple differential protection
The recognition methods of abnormality is described in detail, the knowledge for the TA abnormalities being no longer pointed to herein in multiple differential protection
Other device is repeated.
It should be noted that in addition to above preferred embodiment, the present invention also has other embodiments, people in the art
The various changes and deformation that member can make according to the present invention, without departing from the spirit of the present invention, all should belong to power of the present invention
Scope defined in sharp claim.
Claims (10)
1. the recognition methods of the TA abnormalities in a kind of protection positioned at multiple differential, it is characterised in that step is as follows：
Judge whether any differential protection in the multiple differential protection that TA is located at starts；
If all differential protections are not actuated, following condition is judged：
Condition a：This side three-phase zero-sequence current is more than multiple determined by the reference current of the TA each differential protections being located at
Differential protection reference current；
Condition b：Any one phase phase current of this side three-phase is less than setting without stream threshold value；
If condition above a and b are satisfied by, TA exceptions are judged, produce TA exception messages, it is each without being located in TA
Individually judged in specific differential protection.
2. the recognition methods of the TA abnormalities in the protection according to claim 1 positioned at multiple differential, it is characterised in that
The multiple differential protects reference current equal to k times of the maximum of the reference current of the TA each differential protections being located at, 0<k
<1。
3. the recognition methods of the TA abnormalities in the protection according to claim 1 or 2 positioned at multiple differential, its feature exist
In described phase current is required to be multiplied by the extremely special coefficients of balance of side differentiation TA；The side differentiates that TA is extremely special and put down
Weigh maximum of the coefficient for the coefficient of balance of public side TA each differential protection.
4. the recognition methods of the TA abnormalities in the protection according to claim 1 or 2 positioned at multiple differential, its feature exist
In the scope without stream threshold value is 30~60mA.
5. the recognition methods of the TA abnormalities in the protection according to claim 1 or 2 positioned at multiple differential, its feature exist
In whether the total differential protection starting element for the multiple differential protection being located at according to TA acts whether judge any differential protection
Start, if total differential protection starting element action, judge that at least a kind of differential protection starts；Otherwise, it is determined that all differences
Dynamic protection is not actuated.
6. the recognition methods of the TA abnormalities in the protection according to claim 5 positioned at multiple differential, it is characterised in that
Total differential protection starting element includes steady-state quantity starting element and transient starting element, if any one starting element moves
Make, then judge that total differential protection starting element starts.
7. the identification device of the TA abnormalities in a kind of protection positioned at multiple differential, it is characterised in that including memory and place
Manage device, the instruction of the execution following steps of the processor processing storage in memory：
Judge whether any differential protection in the multiple differential protection that TA is located at starts；
If all differential protections are not actuated, following condition is judged：
Condition a：This side three-phase zero-sequence current is more than multiple determined by the reference current of the TA each differential protections being located at
Differential protection reference current；
Condition b：Any one phase phase current of this side three-phase is less than setting without stream threshold value；
If condition above a and b are satisfied by, TA exceptions are judged, produce TA exception messages, it is each without being located in TA
Individually judged in specific differential protection.
8. the identification device of the TA abnormalities in the protection according to claim 7 positioned at multiple differential, it is characterised in that
The multiple differential protects reference current equal to k times of the maximum of the reference current of the TA each differential protections being located at, 0<k
<1。
9. the identification device of the TA abnormalities in multiple differential protection according to claim 7 or 8, its feature exist
In described phase current is required to be multiplied by the extremely special coefficients of balance of side differentiation TA；The side differentiates that TA is extremely special and put down
Weigh maximum of the coefficient for the coefficient of balance of public side TA each differential protection.
10. the identification device of the TA abnormalities in multiple differential protection according to claim 7 or 8, its feature
It is, whether the total differential protection starting element for the multiple differential protection being located at according to TA, which acts, judges that any differential protection is
No startup, if total differential protection starting element action, judge that at least a kind of differential protection starts；It is otherwise, it is determined that all
Differential protection is not actuated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710652015.XA CN107579506B (en) | 2017-08-02 | 2017-08-02 | The recognition methods of TA abnormality in multiple differential protection and device |
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| CN201710652015.XA CN107579506B (en) | 2017-08-02 | 2017-08-02 | The recognition methods of TA abnormality in multiple differential protection and device |
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| CN107579506A true CN107579506A (en) | 2018-01-12 |
| CN107579506B CN107579506B (en) | 2019-04-23 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1545179A (en) * | 2003-11-27 | 2004-11-10 | 南京南瑞继保电气有限公司 | Transformer differential protection difference stream and differential protection instantaneous TA abnormal state identification protecting method |
| JP4994140B2 (en) * | 2007-07-19 | 2012-08-08 | 中国電力株式会社 | Ratio differential relay and ratio differential relay malfunction prevention method |
-
2017
- 2017-08-02 CN CN201710652015.XA patent/CN107579506B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1545179A (en) * | 2003-11-27 | 2004-11-10 | 南京南瑞继保电气有限公司 | Transformer differential protection difference stream and differential protection instantaneous TA abnormal state identification protecting method |
| JP4994140B2 (en) * | 2007-07-19 | 2012-08-08 | 中国電力株式会社 | Ratio differential relay and ratio differential relay malfunction prevention method |
Non-Patent Citations (1)
| Title |
|---|
| 张红跃 等: "直流输电系统中换流变差动保护TA断线判据的改进", 《电工文摘》 * |
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