CN106356814B - A kind of series transformer winding over-voltage protection method based on voltage vector difference - Google Patents
A kind of series transformer winding over-voltage protection method based on voltage vector difference Download PDFInfo
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- CN106356814B CN106356814B CN201610808777.XA CN201610808777A CN106356814B CN 106356814 B CN106356814 B CN 106356814B CN 201610808777 A CN201610808777 A CN 201610808777A CN 106356814 B CN106356814 B CN 106356814B
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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
- H02H7/04—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 for transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of series transformer winding over-voltage protection methods based on voltage vector difference.Its working method is：Voltage transformer is installed at series transformer primary side winding both ends; the voltage vector difference of two voltage transformers acquisition is calculated in real time; voltage difference virtual value is compared with overvoltage definite value, protection act after voltage difference virtual value is more than overvoltage definite value and meets time delays.The present invention can effectively prevent damage of the series transformer winding overvoltage to equipment.
Description
Technical field
The present invention relates to the design methods of field of power series transformer protection, in particular to series transformer
The guard method of winding overvoltage.
Background technology
Series transformer is the power transformer that primary side winding both ends seal in electric system.Series transformer and conventional power
System transformer is compared, and application scenario is different, and primary connection is different.
The usual one end ground connection of common transformer primary side winding, therefore the voltage of PT (voltage transformer) acquisitions can be anti-strictly according to the facts
Reflect the voltage (as shown in Figure 1) at winding both ends.Series transformer is not directly grounded since first winding seals in system, because
What this PT measured voltage reflection is winding voltage over the ground rather than the voltage at winding both ends.
Series transformer usually winding rated voltage itself is relatively low, but the system voltage of its work is very high.Therefore work as system
When being abnormal, if earth fault occurs for series transformer primary side, series transformer winding one end is voltage levels system at this time
Unite voltage, a terminal voltage close to 0, winding both end voltage far more than Winding Design rated voltage.It is as excessively electric accordingly in do not configured
Pressure protection, may result in transformer winding and is damaged because of overvoltage.Overvoltage protection is not configured in existing series transformer.
Invention content
In view of the deficiencies of the prior art, the present invention is intended to provide a kind of series transformer winding mistake based on voltage vector difference
Voltage protection method.
In order to achieve the above objectives, a kind of series transformer winding over-voltage protection method based on vector difference, feature exist
In：Acquire electrical quantity, including series transformer winding both end voltage；
According to the acquired electrical quantity, the voltage difference for carrying out series transformer winding both ends calculates, carries out overvoltage
Protection act behavior differentiates；
Wherein, the voltage difference calculating at series transformer winding both ends refers specifically to：Series transformer primary side winding both sides voltage
Do vector difference.
Wherein, overvoltage protection action behavior, which differentiates, refers to：The fundamental wave virtual value and overvoltage of winding voltage difference of the two ends
Definite value is compared.After any phase voltage difference fundamental wave virtual value calculated is more than definite value, and delay meets time definite value,
It is judged as that overvoltage protection acts.
The present invention effect be：A kind of mistake of series transformer is realized by acquiring series transformer winding both end voltage
Voltage protection method can effectively prevent damage of the series transformer winding overvoltage to equipment.
Description of the drawings
Fig. 1 is common transformer and PT primary connection figures；
Fig. 2 is series transformer and PT primary connection figures.
Specific implementation mode
The solution of the present invention specifically, acquire electrical quantity first, including series transformer winding both end voltage (PT1 and
PT2), as shown in Figure 2.
According to the acquired electrical quantity, carries out series connection and become the voltage difference calculating at winding both ends, carry out overvoltage protection
Action behavior differentiates；
Wherein, the voltage difference calculating at series connection change winding both ends refers specifically to：Series transformer primary side winding both sides voltage do to
Amount is poor.
Wherein, overvoltage protection action behavior, which differentiates, refers to：The fundamental wave virtual value and overvoltage of winding voltage difference of the two ends
Definite value is compared.After any phase voltage difference fundamental wave virtual value calculated is more than definite value, and delay meets time definite value,
It is judged as that overvoltage protection acts.
Technical scheme of the present invention is further elaborated with reference to a specific embodiment：Assuming that series transformer
The measured value of the system for running on line voltage 220kV, nominal situation PT1 and PT2 is the measurement voltage of 127kV, PT1 and PT2
Difference is 0kV.Earth fault occurs at K1 at this time, as shown in Figure 2.Assuming that PT1 measured values are 0kV, PT2 measured values after failure occurs
Voltage difference for 100kV, PT1 and PT2 is 100kV.When overvoltage definite value is 50kV, and delay time is 1s, according to this programme,
After 1s is delayed, overvoltage protection operation condition meets, after protection act can isolated fault, protect series transformer not to be damaged
Wound.As conventionally, taken the measured value of PT1 or PT2 to carry out overvoltage calculating, overvoltage definite value is higher than working voltage
127V (otherwise nominal situation protection will act), PT1 and PT2 voltages reduce after failure, and conventional overvoltage protection can not be just
Positive motion is made, so as to cause series transformer to cause to damage because of extended overvoltage.From the above technical solution of the present invention shows that,
The beneficial effects of the present invention are：A kind of the excessively electric of series transformer is realized by acquiring series transformer winding both end voltage
Guard method is pressed, damage of the series transformer winding overvoltage to equipment can be effectively prevent.
Although the present invention has been disclosed as a preferred embodiment, however, it is not to limit the invention.Skill belonging to the present invention
Has usually intellectual in art field, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Cause
This, the scope of protection of the present invention is defined by those of the claims.
Claims (1)
1. a kind of series transformer winding over-voltage protection method based on voltage vector difference, it is characterised in that：Electrical quantity is acquired,
Including series transformer winding both end voltage；
According to the acquired electrical quantity, the voltage difference for carrying out series transformer winding both ends calculates, carries out overvoltage protection
Action behavior differentiates；
The implementation method that the voltage difference at series transformer winding both ends calculates is series transformer primary side winding both sides voltage
Do vector difference；
The implementation method that the overvoltage protection action behavior differentiates is：The fundamental wave virtual value of winding voltage difference of the two ends and excessively electric
Pressure definite value is compared；When any phase voltage difference fundamental wave virtual value calculated is more than overvoltage protection definite value, and it is full to be delayed
After sufficient time definite value, it is judged as that overvoltage protection acts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610808777.XA CN106356814B (en) | 2016-09-07 | 2016-09-07 | A kind of series transformer winding over-voltage protection method based on voltage vector difference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610808777.XA CN106356814B (en) | 2016-09-07 | 2016-09-07 | A kind of series transformer winding over-voltage protection method based on voltage vector difference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106356814A CN106356814A (en) | 2017-01-25 |
| CN106356814B true CN106356814B (en) | 2018-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610808777.XA Active CN106356814B (en) | 2016-09-07 | 2016-09-07 | A kind of series transformer winding over-voltage protection method based on voltage vector difference |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631265B (en) * | 2017-03-24 | 2019-08-30 | 南京南瑞继保电气有限公司 | It is a kind of that the series transformer longitudinal differential protecting equipment sentenced and method are joined based on double differential module |
| CN107026423A (en) * | 2017-03-30 | 2017-08-08 | 南京南瑞继保电气有限公司 | One kind prevents PT broken strings from causing overvoltage protection malfunction device and method |
| CN107017604B (en) * | 2017-04-13 | 2019-07-23 | 南京南瑞继保电气有限公司 | A kind of overvoltage protection voltage transformer disconnection faulty action preventing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931212A (en) * | 2010-08-27 | 2010-12-29 | 西安交通大学 | Transformer self-adaptive protector and protection method thereof |
| CN102013664A (en) * | 2010-12-13 | 2011-04-13 | 海信科龙电器股份有限公司 | Protection device for transformer |
| CN102437746A (en) * | 2011-11-22 | 2012-05-02 | 国网电力科学研究院 | Grading compensation power supply device for field correction of ultra/extra high-voltage CVT (constant-voltage transformer) |
| CN202535070U (en) * | 2012-03-30 | 2012-11-14 | 上海市电力公司 | Unified power quality controller |
| CN104795801A (en) * | 2015-04-29 | 2015-07-22 | 南京南瑞继保电气有限公司 | Method and device for circuit breaker open-phase discrimination based on voltage |
-
2016
- 2016-09-07 CN CN201610808777.XA patent/CN106356814B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931212A (en) * | 2010-08-27 | 2010-12-29 | 西安交通大学 | Transformer self-adaptive protector and protection method thereof |
| CN102013664A (en) * | 2010-12-13 | 2011-04-13 | 海信科龙电器股份有限公司 | Protection device for transformer |
| CN102437746A (en) * | 2011-11-22 | 2012-05-02 | 国网电力科学研究院 | Grading compensation power supply device for field correction of ultra/extra high-voltage CVT (constant-voltage transformer) |
| CN202535070U (en) * | 2012-03-30 | 2012-11-14 | 上海市电力公司 | Unified power quality controller |
| CN104795801A (en) * | 2015-04-29 | 2015-07-22 | 南京南瑞继保电气有限公司 | Method and device for circuit breaker open-phase discrimination based on voltage |
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| CN106356814A (en) | 2017-01-25 |
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