CN105098739A - Partition differential method for connection mode for line transformer bank - Google Patents
Partition differential method for connection mode for line transformer bank Download PDFInfo
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- CN105098739A CN105098739A CN201510566907.9A CN201510566907A CN105098739A CN 105098739 A CN105098739 A CN 105098739A CN 201510566907 A CN201510566907 A CN 201510566907A CN 105098739 A CN105098739 A CN 105098739A
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Abstract
The invention discloses a partition differential method for a connection mode for a line transformer bank. The method comprises the steps as follows: 1) separately arranging three-phase CTs at a line side, and a high-voltage side and a low-voltage side of a transformer, and separately arranging line-change group protection devices are the line side and the side of the transformer, wherein the line-change group protection device located at the side of the transformer is interconnected with the line-change group protection device located at the line side via a fiber channel; 2) using current of the line side and the three-phase current of the low-voltage side of the transformer to form line-change group differential, the current of the line side and the three-phase current of the high-voltage side of the transformer to form line differential, and the three-phase current of the high-voltage side of the transformer and the three-phase current of the low-voltage side of the transformer to form transformer differential; 3) analyzing a motion behavior of the line-change group differential, the line differential or the transformer differential if the line transformer has a fault movement to fast locate that the fault is in the side of the transformer or the line side. The method of the invention achieves the fast fault partition of the connection node of the line-change group without increasing relay protection equipment, which has very strong flexibility and applicability.
Description
Technical field
The present invention relates to technical field of electric system protection, be specifically related to a kind of subregion differential method for line-transformer-connection mode.
Background technology
The mode of connection of line transformer group, owing to can reduce the investment of primary equipment, the application in electric power system and industrial and mining enterprises gets more and more, and, adopt the electric pressure of the line change group mode of connection also more and more higher.But; existing line change group protection is by optical-fibre channel transfer line trackside information and step down side information; line change group is realized differential with this; the method is when breaking down in line change group protection range; cannot distinguish this fault is the fault of transformer or the fault of circuit, brings great puzzlement to accident analysis, fast recovery of power supply.Therefore, the necessary guard method to existing line-transformer-connection mode improves.
Summary of the invention
Technical problem solved by the invention is the protection of existing line change group, when breaking down in line change group protection range, cannot distinguish the problem that this fault is the fault of transformer or the fault of circuit.Subregion differential method for line-transformer-connection mode of the present invention; line change group mode of connection fast failure subregion can be realized when not increasing protective relaying device; not by the restriction of line change group protection both sides collection capacity form, there is very strong flexibility and applicability.
In order to achieve the above object, the technical solution adopted in the present invention is:
For a subregion differential method for line-transformer-connection mode, it is characterized in that: comprise the following steps,
Step (1), in line side, the high-pressure side of transformer, low-pressure side respectively installs three-phase CT, and line side, transformer side respectively installs a line change group protective device, the high-pressure side three-phase current of the line change group protective device access transformer of described transformer side, the low-pressure side three-phase current of transformer, the electric current of the line change group protective device gathering line trackside in line side, interconnected by optical-fibre channel between the line change group protective device of transformer side and the line change group protective device in line side, for the height of transformer, the current synchronization in the three-phase current of low-pressure side and the line side of offside and transmission mutually,
Step (2), by differential for the three-phase current formation line change group of the electric current in line side and step down side; The electric current in line side and the three-phase current of high voltage side of transformer form Line Differential, and the high-pressure side three-phase current of transformer and the three-phase current of its low-pressure side form transformer differential;
Step (3), the action if line transformer group breaks down, while online change group differential action, the action behavior of the differential or transformer differential of analysis circuit, quick position fault is in transformer side or in line side, when Line Differential action, fault occurs in line side, utilizes the distance-finding method of Two-Terminal Electrical Quantities to realize precision ranging; When transformer differential action, fault occurs in transformer side;
The aforesaid subregion differential method for line-transformer-connection mode; it is characterized in that: a line change group protective device is respectively installed in step (1) line side, transformer side, described line change group protective device is also for realizing the backup protection of circuit, transformer.
The aforesaid subregion differential method for line-transformer-connection mode, is characterized in that: the current acquisition amount of described line change group protective device is analog quantity or digital quantity.
The invention has the beneficial effects as follows: the subregion differential method for line-transformer-connection mode of the present invention, line change group mode of connection fast failure subregion can be realized when not increasing protective relaying device, plant stand transformation for original employing line change group protection can keep original line side, the low-pressure side wiring of transformer, only increase high voltage side current collection capacity, can expand by practical function, there is very strong economy and autgmentability, not by the restriction of line change group protection both sides collection capacity form, both sides plant stand can be normal station and normal station, normal station and intelligent station, intelligent station and normal station, intelligent station and intelligent station, simultaneously, both 110kV electric pressure had been applicable to, also can be used for 35/10kV electric pressure, there is very strong flexibility and applicability.
Accompanying drawing explanation
Fig. 1 is the flow chart of the subregion differential method for line-transformer-connection mode of the present invention.
Fig. 2 is the scheme of installation of line change group protective device of line side of the present invention, transformer side.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
Subregion differential method for line-transformer-connection mode of the present invention, can realize line change group mode of connection fast failure subregion, as shown in Figure 1, comprising the following steps when not increasing protective relaying device,
Step (1), in line side, the high-pressure side of transformer, low-pressure side respectively installs three-phase CT, and line side, transformer side respectively installs a line change group protective device, the high-pressure side three-phase current of the line change group protective device access transformer of described transformer side, the low-pressure side three-phase current of transformer, the electric current of the line change group protective device gathering line trackside in line side, interconnected by optical-fibre channel between the line change group protective device of transformer side and the line change group protective device in line side, for the height of transformer, the current synchronization in the three-phase current of low-pressure side and the line side of offside and transmission mutually, scheme of installation, as shown in Figure 2, plant stand transformation for original employing line change group protection can keep original line side, the low-pressure side wiring of transformer, only increase high voltage side current collection capacity, can expand by practical function, there is very strong economy and autgmentability, its center line change group protective device is also for realizing circuit, the backup protection of transformer, the current acquisition amount of line change group protective device is analog quantity or digital quantity, therefore, not by the restriction of line change group protection both sides collection capacity form, both sides plant stand can be normal station and normal station, normal station and intelligent station, intelligent station and normal station, intelligent station and intelligent station, simultaneously, both 110kV electric pressure had been applicable to, also can be used for 35/10kV electric pressure, there is very strong flexibility and applicability,
Step (2), by differential for the three-phase current formation line change group of the electric current in line side and step down side; The electric current in line side and the three-phase current of high voltage side of transformer form Line Differential, and the high-pressure side three-phase current of transformer and the three-phase current of its low-pressure side form transformer differential;
Step (3), the action if line transformer group breaks down, the action behavior of the differential or transformer differential of analysis circuit while online change group differential action, quick position fault is in transformer side or in line side, when Line Differential action, fault occurs in line side, utilizes the distance-finding method of Two-Terminal Electrical Quantities to realize precision ranging; When transformer differential action, fault occurs in transformer side;
In sum, subregion differential method for line-transformer-connection mode of the present invention, do not increasing in protective relaying device situation, line differential protection and transformer differential protection can be realized simultaneously, can realize fault quick, accurately locate, improve accident analysis and fast recovery of power supply ability, ensure that the reliability of system power supply and the rapidity of relaying protection; Plant stand transformation for original employing line change group protection can keep original wiring, only increases main transformer high voltage side current collection capacity, gets final product practical function expansion, has very strong economy and autgmentability; And; not by the restriction of line change group protection both sides collection capacity form; both sides plant stand can be normal station and normal station, normal station and intelligent station, intelligent station and normal station, intelligent station and intelligent station; simultaneously; the present invention had both been applicable to 110kV electric pressure; also can be used for 35/10kV electric pressure, there is very strong flexibility and applicability.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (3)
1., for a subregion differential method for line-transformer-connection mode, it is characterized in that: comprise the following steps,
Step (1), in line side, the high-pressure side of transformer, low-pressure side respectively installs three-phase CT, and line side, transformer side respectively installs a line change group protective device, the high-pressure side three-phase current of the line change group protective device access transformer of described transformer side, the low-pressure side three-phase current of transformer, the electric current of the line change group protective device gathering line trackside in line side, interconnected by optical-fibre channel between the line change group protective device of transformer side and the line change group protective device in line side, for the height of transformer, the current synchronization in the three-phase current of low-pressure side and the line side of offside and transmission mutually,
Step (2), by differential for the three-phase current formation line change group of the electric current in line side and step down side; The electric current in line side and the three-phase current of high voltage side of transformer form Line Differential, and the high-pressure side three-phase current of transformer and the three-phase current of its low-pressure side form transformer differential;
Step (3), the action if line transformer group breaks down, while online change group differential action, the action behavior of the differential or transformer differential of analysis circuit, quick position fault is in transformer side or in line side, when Line Differential action, fault occurs in line side, utilizes the distance-finding method of Two-Terminal Electrical Quantities to realize precision ranging; When transformer differential action, fault occurs in transformer side.
2. the subregion differential method for line-transformer-connection mode according to claim 1; it is characterized in that: a line change group protective device is respectively installed in step (1) line side, transformer side, described line change group protective device is also for realizing the backup protection of circuit, transformer.
3. the subregion differential method for line-transformer-connection mode according to claim 1 and 2, is characterized in that: the current acquisition amount of described line change group protective device is analog quantity or digital quantity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510566907.9A CN105098739A (en) | 2015-09-09 | 2015-09-09 | Partition differential method for connection mode for line transformer bank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510566907.9A CN105098739A (en) | 2015-09-09 | 2015-09-09 | Partition differential method for connection mode for line transformer bank |
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| CN105098739A true CN105098739A (en) | 2015-11-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356820A (en) * | 2016-09-28 | 2017-01-25 | 广东电网有限责任公司揭阳供电局 | Differential protection system |
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Application publication date: 20151125 |