CN107546718B - It is a kind of positioned at multiple differential protection in TA abnormality recognition methods and device - Google Patents
It is a kind of positioned at multiple differential protection in TA abnormality recognition methods and device Download PDFInfo
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- CN107546718B CN107546718B CN201710652028.7A CN201710652028A CN107546718B CN 107546718 B CN107546718 B CN 107546718B CN 201710652028 A CN201710652028 A CN 201710652028A CN 107546718 B CN107546718 B CN 107546718B
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- 230000004224 protection Effects 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005856 abnormality Effects 0.000 title claims abstract description 29
- 230000001052 transient effect Effects 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims 2
- 230000002159 abnormal effect Effects 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The present invention relates to a kind of recognition methods of TA abnormality in multiple differential protection and devices, comprising: judge multiple differential that TA is located at protect in any differential protection whether start；If any differential protection starting, judge the condition of following condition: 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 all satisfied, TA exception is determined.In the present invention; when any differential protection starting in the multiple differential protection that TA is located at; the TA abnormal conditions are judged by curent change situation; single message is generated if TA is abnormal, without being judged in each specific differential protection, not only optimizes TA exception decision logic; reduce the message number that TA is generated extremely; cpu resource is saved, and realization principle is simple, meets reality.
Description
Technical field
The present invention relates to a kind of recognition methods of TA abnormality in multiple differential protection and devices, belong to electric power
System relay protection technical field.
Background technique
Currently, the identification of TA abnormality sets all in accordance with some specific differential protections greatly in transformer differential circuit
It sets, such as the TA abnormality identification of transformer ratio brake type differential protection is divided into high pressure side end TA exception, low pressure side
Portion TA is abnormal, and the TA abnormality identification of high-pressure side winding differential protection is divided into high pressure side end TA exception, high-pressure side tail portion TA
It is abnormal, if transformer ratio brake type differential protection and high-pressure side winding differential protection are realized in the same device, for
High pressure side end TA is abnormal, and device can generate 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 the same TA configures more differential protections, the message which generates extremely can be more
It is more, the resource of CPU is not only wasted, but also be easy to cause confusion to operations staff.
Summary of the invention
The object of the present invention is to provide it is a kind of positioned at multiple differential protection in TA abnormality recognition methods and device,
For solve be located at multiple differential protection in TA exception when generate message it is more, not only waste cpu resource and also be easy to
Operations staff causes confusion this technical problem.
In order to solve the above technical problems, the present invention provides a kind of knowledges of TA abnormality in multiple differential protection
Other method, including following scheme:
Recognition methods scheme one: steps are as follows:
Judge whether any differential protection in multiple differential protection that TA is located at starts；
If any differential protection starting, judges following condition:
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 all satisfied, determine TA exception, TA exception message is generated, without what is be located in TA
Individually judged in each specific differential protection.
Recognition methods scheme two, on the basis of recognition methods scheme one, if further including that all differential protections do not open
It is dynamic, following condition is judged:
Condition a: this side three-phase zero-sequence current is greater than determined by the reference current of the TA each differential protection 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 all satisfied, determine TA exception, TA exception message is generated, without what is be located in TA
Individually judged in each specific differential protection.
Recognition methods scheme three, on the basis of recognition methods scheme two, the multiple differential protection reference current is equal to
K times of the maximum value of the reference current for each differential protection that the TA is located at, 0 < k < 1.
Recognition methods scheme four, five, six, respectively on the basis of recognition methods scheme one, two, three, the phase current
It is required to differentiate the extremely dedicated coefficient of balance of TA multiplied by the side；The side differentiates that the extremely dedicated coefficient of balance of TA is the public side
The maximum value of the coefficient of balance of each differential protection of TA.
Recognition methods scheme seven, eight, nine, it is described without stream threshold respectively on the basis of recognition methods scheme one, two, three
The range of value is 30~60mA.
Recognition methods scheme ten, 11,12, respectively on the basis of recognition methods scheme one, two, three, according to TA institute
Whether the total differential protection starting element for the multiple differential protection being located at, which acts, judges whether any differential protection starts, if total poor
Dynamic protection starting element movement then determines at least a kind of differential protection starting；Otherwise, it is determined that all differential protections do not open
It is dynamic.
Recognition methods scheme 13,14,15, respectively on the basis of recognition methods scheme ten, 11,12, institute
Stating total differential protection starting element includes steady-state quantity starting element and transient starting element, if any one starting element is dynamic
Make, then determines total differential protection starting element starting.
The present invention also provides a kind of identification devices of TA abnormality in multiple differential protection, including with lower section
Case:
Identification device scheme one, including memory and processor, the processor handle execution stored in memory
The instruction of following steps:
Judge whether any differential protection in multiple differential protection that TA is located at starts；
If any differential protection starting, judges following condition:
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 all satisfied, determine TA exception, TA exception message is generated, without what is be located in TA
Individually judged in each specific differential protection.
Identification device scheme two further includes as given an order on the basis of identification device scheme one:
If all differential protections are inactive, following condition is judged:
Condition a: this side three-phase zero-sequence current is greater than determined by the reference current of the TA each differential protection 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 all satisfied, determine TA exception, TA exception message is generated, without what is be located in TA
Individually judged in each specific differential protection.
Identification device scheme three, on the basis of identification device scheme two, the multiple differential protection reference current is equal to
K times of the maximum value of the reference current for each differential protection that the TA is located at, 0 < k < 1.
Identification device scheme four, five, six, respectively on the basis of identification device scheme one, two, three, the phase current
It is required to differentiate the extremely dedicated coefficient of balance of TA multiplied by the side；The side differentiates that the extremely dedicated coefficient of balance of TA is the public side
The maximum value of the coefficient of balance of each differential protection of TA.
Identification device scheme seven, eight, nine, it is described without stream threshold respectively on the basis of identification device scheme one, two, three
The range of value is 30~60mA.
Identification device scheme ten, 11,12, respectively on the basis of identification device scheme one, two, three, according to TA institute
Whether the total differential protection starting element for the multiple differential protection being located at, which acts, judges whether any differential protection starts, if total poor
Dynamic protection starting element movement then determines at least a kind of differential protection starting；Otherwise, it is determined that all differential protections do not open
It is dynamic.
Identification device scheme 13,14,15, respectively on the basis of identification device scheme ten, 11,12, institute
Stating total differential protection starting element includes steady-state quantity starting element and transient starting element, if any one starting element is dynamic
Make, then determines total differential protection starting element starting.
The beneficial effects of the present invention are:
When any differential protection starting in the multiple differential protection that TA is located at, by curent change situation to the TA
Abnormal conditions are judged, generate single message if TA is abnormal, without being judged in each specific differential protection,
TA exception decision logic is not only optimized, reduces the message number that TA is generated extremely, saves cpu resource, and realize original
Reason is simple, meets reality.
Detailed description of the invention
Fig. 1 is the configuration schematic diagram of transformer differential protection；
Fig. 2 is the realization block diagram of total differential protection starting element；
Fig. 3 is the realization block diagram of multiple differential protection reference current；
Fig. 4 is the realization block diagram of TA exception special balancing coefficient.
Specific embodiment
With reference to the accompanying drawing and specific embodiment detailed description of the preferred embodiments.
Fig. 1 gives the configuration schematic diagram of certain transformer differential protection, which 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, used in various differential protections
Current transformer TA is as shown in Table 1 below.
Table 1
If the same TA is configured with different differential protections using TA as research object.By taking TA1 as an example, big poor protection and
Pilot differential all uses the TA1.For the TA being located in multiple differential protection, the multiple differential provided by the present invention that is located at is protected
In TA abnormality recognition methods the following steps are included:
The first step, judges whether any differential protection in multiple differential protection that TA is located at starts.
It, 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 acts as the distinguishing rule for judging whether any differential protection starts, if total differential protection starting element
Movement then determines at least a kind of differential protection starting；Otherwise, it is determined that all differential protections are inactive.Fig. 2 gives always
The realization block diagram of differential protection starting element, i.e., it is total poor when the starting element movement in involved any differential protection
Dynamic protection starting element movement.
It should be noted that signified total differential protection starting element includes that steady-state quantity starting element and transient open herein
Dynamic element determines total differential protection starting element starting, total differential protection starting element if any one starting element acts
Set 1.
Second step, according to the starting situation of the TA multiple differential protection being located at, 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 all satisfied, determine TA exception, TA exception message is generated, without what is be located in TA
Individually judged in each specific differential protection.
Situation two: if all differential protections are inactive, following condition is judged:
Condition a: this side three-phase zero-sequence current is greater than determined by the reference current of the TA each differential protection 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 all satisfied, determine TA exception, TA exception message is generated, without what is be located in TA
Individually judged in each specific differential protection.
Specifically, the above-mentioned range without stream threshold value is 30~60mA (including endpoint value).Multiple differential protects benchmark electricity
Stream is equal to k times of the maximum value of the reference current for each differential protection that the TA is located at, and wherein k is the positive reality greater than 0 less than 1
Number.By taking one TA1 of lead as an example, (TA is extremely special using reference current by multiple differential protection one TA1 of reference current, that is, lead of TA1
With) realize block diagram as shown in figure 3, choosing the maximum value of big poor protection reference current and pilot differential reference current multiplied by k
Times, it obtains one TA1 of lead and uses reference current (TA is extremely dedicated).
Each phase current involved by Rule of judgment A, B, a, b in the situation of two kinds of front is required to differentiate TA multiplied by the side
Abnormal dedicated coefficient of balance, Fig. 4 are the realization block diagram of TA exception special balancing coefficient, as shown in Figure 4: TA exception special balancing
Coefficient is the maximum value of the coefficient of balance of each differential protection of public side TA.It is with one coefficient of balance of lead (TA is extremely dedicated)
Example, the maximum value for choosing big poor protection one coefficient of balance of lead and one coefficient of balance of pilot differential lead are as the balance of lead one
Number (TA is extremely dedicated).
After the movement of total differential protection starting element, if meeting the differentiation of TA exception, in order to avoid differential protection malfunction, remove
Outside the warning information for issuing " TA is abnormal ", it is also necessary to which locking uses the differential protection of broken string TA.But stream of being on duty is greater than a certain
After setting definite value (the setting definite value is mainly used to the difference stream generated when simulating catastrophe failure), the alarm letter of " TA is abnormal " is only issued
The differential protection that breath, no longer locking use broken string TA, to avoid differential protection tripping.
The recognition methods of TA abnormality provided by the present invention in multiple differential protection is simple and easy, not only may be used
To differentiate single-phase wire break, the multiphase broken string in the circuit TA, when can also differentiate certain phase current broken string, what electric current was not fully disconnected
Situation can more differentiate the case where secondary circuit of the side TA biphase current occurs to be shorted or accidentally touch, and biphase current becomes smaller simultaneously.
The present invention also provides a kind of identification device of TA abnormality in multiple differential protection, the identification devices
Including memory and processor, the processor handles the instruction stored in memory for executing following steps:
Judge whether any differential protection in multiple differential protection that TA is located at starts；
If any differential protection starting, judges following condition:
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 all satisfied, determine TA exception, TA exception message is generated, without what is be located in TA
Individually judged in each specific differential protection.
The identification device for being located at the TA abnormality in multiple differential protection comes real indeed through computer instruction
The recognition methods of the existing above-mentioned TA abnormality in multiple differential protection, due to the TA being located in multiple differential protection
The recognition methods of abnormality is described in detail, herein the knowledge no longer to the TA abnormality being located in multiple differential protection
Other device is repeated.
It should be noted that in addition to above preferred embodiment, there are other embodiments of the invention, those skilled in the art
The various changes and variants that member can make according to the present invention, as long as it does not depart from the spirit of the invention, should belong to power of the present invention
Range defined in sharp claim.
Claims (12)
1. a kind of recognition methods of the TA abnormality in multiple differential protection, which is characterized in that steps are as follows:
Judge whether any differential protection in multiple differential protection that TA is located at starts；
If any differential protection starting, judges following condition:
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 all satisfied, TA exception is determined, generate TA exception message, it is each without being located in TA
Individually judged in specific differential protection；
The phase current is required to differentiate the extremely dedicated coefficient of balance of TA multiplied by the side；The side differentiates that TA is extremely dedicated flat
The maximum value of the coefficient of balance for each differential protection that weighing apparatus coefficient is public side TA.
2. the recognition methods of the TA abnormality according to claim 1 in multiple differential protection, which is characterized in that
If further including that all differential protections are inactive, following condition is judged:
Condition a: this side three-phase zero-sequence current is greater than multiple determined by the reference current of the TA each differential protection 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 all satisfied, TA exception is determined, generate TA exception message, it is each without being located in TA
Individually judged in specific differential protection.
3. the recognition methods of the TA abnormality according to claim 2 in multiple differential protection, which is characterized in that
The multiple differential protection reference current is equal to k times of the maximum value of the reference current for each differential protection that the TA is located at, 0 < k
<1。
4. the recognition methods of the TA abnormality according to any one of claim 1-3 in multiple differential protection,
It is characterized in that, the range without stream threshold value is 30 ~ 60mA.
5. the recognition methods of the TA abnormality according to any one of claim 1-3 in multiple differential protection,
It is characterized in that, be located at according to TA multiple differential protection total differential protection starting element whether act judge it is any differential
Whether protection starts, if total differential protection starting element movement, determines at least a kind of differential protection starting；Otherwise, it is determined that
All differential protections are inactive.
6. the recognition methods of the TA abnormality according to claim 5 in multiple differential protection, which is characterized in that
Total differential protection starting element includes steady-state quantity starting element and transient starting element, if any one starting element is dynamic
Make, then determines total differential protection starting element starting.
7. a kind of identification device of the TA abnormality in multiple differential protection, which is characterized in that including memory and place
Device is managed, the processor handles the instruction stored in memory for executing following steps:
Judge whether any differential protection in multiple differential protection that TA is located at starts；
If any differential protection starting, judges following condition:
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 all satisfied, TA exception is determined, generate TA exception message, it is each without being located in TA
Individually judged in specific differential protection；
The phase current is required to differentiate the extremely dedicated coefficient of balance of TA multiplied by the side；The side differentiates that TA is extremely dedicated flat
The maximum value of the coefficient of balance for each differential protection that weighing apparatus coefficient is public side TA.
8. the identification device of the TA abnormality according to claim 7 in multiple differential protection, which is characterized in that
Further include as given an order:
If all differential protections are inactive, following condition is judged:
Condition a: this side three-phase zero-sequence current is greater than multiple determined by the reference current of the TA each differential protection 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 all satisfied, TA exception is determined, generate TA exception message, it is each without being located in TA
Individually judged in specific differential protection.
9. the identification device of the TA abnormality according to claim 8 in multiple differential protection, which is characterized in that
The multiple differential protection reference current is equal to k times of the maximum value of the reference current for each differential protection that the TA is located at, 0 < k
<1。
10. the identification device for the TA abnormality being located in multiple differential protection according to any one of claim 7-9,
It is characterized in that, the range without stream threshold value is 30 ~ 60mA.
11. the identification device for the TA abnormality being located in multiple differential protection according to any one of claim 7-9,
It is characterized in that, be located at according to TA multiple differential protection total differential protection starting element whether act judge it is any differential
Whether protection starts, if total differential protection starting element movement, determines at least a kind of differential protection starting；Otherwise, it is determined that
All differential protections are inactive.
12. the identification device of the TA abnormality according to claim 11 in multiple differential protection, feature exist
In total differential protection starting element includes steady-state quantity starting element and transient starting element, if any one starting member
Part movement then determines total differential protection starting element starting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710652028.7A CN107546718B (en) | 2017-08-02 | 2017-08-02 | It is a kind of positioned at multiple differential protection in TA abnormality recognition methods and device |
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| CN201710652028.7A CN107546718B (en) | 2017-08-02 | 2017-08-02 | It is a kind of positioned at multiple differential protection in TA abnormality recognition methods and device |
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| CN100433486C (en) * | 2003-11-27 | 2008-11-12 | 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 |
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