CN109830938B - Main transformer body heavy gas protection circuit and method - Google Patents
Main transformer body heavy gas protection circuit and method Download PDFInfo
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- CN109830938B CN109830938B CN201910137529.0A CN201910137529A CN109830938B CN 109830938 B CN109830938 B CN 109830938B CN 201910137529 A CN201910137529 A CN 201910137529A CN 109830938 B CN109830938 B CN 109830938B
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Abstract
The invention discloses a main transformer body heavy gas protection circuit and a method, wherein the gas relay electric contact in the circuit comprises two electric contacts connected in series. The gas relay electrical contact and the heavy gas relay coil are connected in series to be used as a first branch, the heavy gas relay normally open contact and the breaker tripping outlet relay coil are connected in series to be used as a second branch, the first breaker tripping outlet relay normally open contact, the first breaker tripping holding relay coil, the first breaker auxiliary normally open contact and the first tripping coil are connected in series to be used as a third branch, the second breaker tripping outlet relay normally open contact, the second breaker tripping holding relay coil, the second breaker auxiliary normally open contact and the second tripping coil are connected in series to be used as a fourth branch, and the first branch, the second branch, the third branch and the fourth branch are connected in parallel with a direct current power supply. According to the main transformer body heavy gas protection circuit and the main transformer body heavy gas protection method, two electric contacts are closed to trigger the subsequent tripping action, so that the reliability is high, and misoperation is avoided.
Description
Technical Field
The invention relates to the technical field of transformer protection, in particular to a main transformer body heavy gas protection circuit and a method.
Background
The main transformer, abbreviated as main transformer (GSU), is a main step-down transformer for power transmission and transformation in a unit or a transformer substation, and is also a core part of the transformer substation. The gas protection is the main protection of the main transformer, and can effectively reflect the internal faults of the transformer. Gas protection includes light gas protection and heavy gas protection. Light gas protection acts on the signal and heavy gas acts on the trip.
The gas relay in heavy gas protection provided by the prior art adopts two pairs of normally open contacts which are used in parallel, or one pair of normally open contacts is used, and the other pair of normally open contacts is used for standby. When the transformer fails, the normally open contact of the transformer heavy gas relay is switched on, the breaker trips, and the power supply of the transformer is cut off, so that safety accidents are prevented.
The inventors found that the prior art has at least the following problems: when the transformer has short circuit fault outside the near zone, the penetrability short circuit current is larger, the winding temperature rises rapidly, the volume of oil expands, the oil flow speed between oil gaps is accelerated, and when the pressure difference change generated between the inside of the oil gaps and the outside of the winding is larger, heavy gas protection can malfunction, so that the circuit breaker trips by mistake and loses power, and the power supply reliability is affected.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a main transformer body heavy gas protection circuit and a method. The specific technical scheme is as follows:
in a first aspect, a main transformer body heavy gas protection circuit is provided, including: the system comprises a direct current power supply, a gas relay electric contact, a microcomputer protection measurement and control device, a first breaker auxiliary normally open contact, a second breaker auxiliary normally open contact, a first tripping coil and a second tripping coil; the gas relay electrical contact comprises two electrical contacts connected in series; the microcomputer protection measurement and control device comprises a heavy gas relay coil, a heavy gas relay normally open contact, a breaker tripping outlet relay coil, a first breaker tripping outlet relay normally open contact, a second breaker tripping outlet relay normally open contact, a first breaker tripping holding relay coil and a second breaker tripping holding relay coil, wherein when the heavy gas relay coil is powered on, the heavy gas relay normally open contact is closed, and when the breaker tripping outlet relay coil is powered on, the first breaker tripping outlet relay normally open contact and the second breaker tripping outlet relay normally open contact are closed; the gas relay electrical contact and the heavy gas relay coil are connected in series to be used as a first branch, the heavy gas relay normally open contact and the breaker tripping outlet relay coil are connected in series to be used as a second branch, the first breaker tripping outlet relay normally open contact, the first breaker tripping holding relay coil, the first breaker auxiliary normally open contact and the first tripping coil are connected in series to be used as a third branch, the second breaker tripping outlet relay normally open contact, the second breaker tripping holding relay coil, the second breaker auxiliary normally open contact and the second tripping coil are connected in series to be used as a fourth branch, and the first branch, the second branch, the third branch and the fourth branch are connected in parallel with the direct current power supply.
In one possible design, the second leg has a first trip tab connected in series.
In one possible embodiment, the third branch is connected in series with a second trip strip.
In one possible embodiment, a third tripping tab is connected in series to the fourth branch.
In one possible design, the gas relay electrical contacts are those of a QYJ-80 type gas relay or a QJ-80 type gas relay.
In a second aspect, a main transformer body heavy gas protection method is provided, and the method comprises the following steps:
when the internal fault of the transformer oil tank reaches a preset degree, the electric contact of the gas relay is closed, and the heavy gas relay coil is electrified;
after the heavy gas relay coil is electrified, the normally open contact of the heavy gas relay is closed, and the tripping outlet relay coil of the circuit breaker is electrified;
after the breaker tripping outlet relay coil is electrified, the normally open contact of the first breaker tripping outlet relay is closed, the first breaker tripping maintaining relay coil and the first tripping coil are electrified, a tripping circuit is switched on, a breaker operating mechanism acts, and the main transformer high-voltage side breaker trips;
after the breaker tripping outlet relay coil is electrified, the normally open contact of the second breaker tripping outlet relay is closed, the second breaker tripping holding relay coil and the second tripping coil are electrified, the tripping circuit is switched on, the breaker operating mechanism acts, and the main transformer low-voltage side breaker trips.
In one possible design, when the main transformer body heavy gas protection circuit is operating normally, the first trip strip, the second trip strip and the third trip strip are in a closed communication state; and opening the first tripping connection piece, the second tripping connection piece and the third tripping connection piece under the conditions of new main transformer operation, large modification power transmission operation, protection plug-in unit replacement, oiling and the like.
The technical scheme of the invention has the main advantages that:
the main transformer body heavy gas protection circuit and the method can realize tripping of the circuit breaker when serious faults occur in the transformer, and cut off power supply of the transformer. And the gas relay electric contact comprises two electric contacts connected in series, the two electric contacts are closed simultaneously to trigger the subsequent tripping action, so that the stability and the safety are higher, and the misoperation phenomenon is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and without limitation to the invention. In the drawings:
fig. 1 is a circuit diagram of a main transformer body heavy gas protection circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes in detail the technical scheme provided by the embodiment of the invention with reference to the accompanying drawings.
In a first aspect, an embodiment of the present invention provides a main transformer body heavy gas protection circuit, as shown in fig. 1, where the protection circuit includes: the device comprises a direct current power supply, a gas relay electric contact, a microcomputer protection measurement and control device, a first breaker auxiliary normally open contact QF1, a second breaker auxiliary normally open contact QF2, a first tripping coil TQ1 and a second tripping coil TQ2. The gas relay electrical contact comprises two electrical contacts connected in series. The microcomputer protection measurement and control device comprises a heavy gas relay coil J, a heavy gas relay normally open contact J1, a breaker tripping relay coil TJ, a first breaker tripping outlet relay normally open interface point TJ1, a second breaker tripping outlet relay normally open contact TJ2, a first breaker tripping holding relay coil TBJ and a second breaker tripping holding relay coil TBJ2, wherein when the heavy gas relay coil J is powered on, the heavy gas relay normally open contact J1 is closed, and when the breaker tripping outlet relay coil TJ is powered on, the first breaker tripping outlet relay normally open contact TJ1 and the second breaker tripping outlet relay normally open contact TJ2 are closed. The gas relay electric contact and the heavy gas relay coil J are connected in series to be used as a first branch, the heavy gas relay normally open contact J1 and the breaker tripping outlet relay coil TJ are connected in series to be used as a second branch, the first breaker tripping outlet relay normally open contact TJ1, the first breaker tripping holding relay coil TBJ1, the first breaker auxiliary normally open contact QF1 and the first tripping coil TQ1 are connected in series to be used as a third branch, the second breaker tripping outlet relay normally open contact TJ2, the second breaker tripping holding relay coil TBJ, the second breaker auxiliary normally open contact QF2 and the second tripping coil TQ2 are connected in series to be used as a fourth branch, and the first branch, the second branch, the third branch and the fourth branch are connected in parallel with a direct current power supply.
The working principle of the main transformer body heavy gas protection circuit provided by the embodiment of the invention is described as follows:
the first breaker auxiliary normally open contact QF1 and the second breaker auxiliary normally open contact QF2 are in a closed state when the transformer is communicated with a high-voltage power supply and a working load to normally work. When the internal fault of the transformer oil tank reaches a preset degree, two electric contacts of the electric contact of the gas relay are closed, and the heavy gas relay coil J is powered. After the heavy gas relay coil J is powered on, the normally open contact J1 of the heavy gas relay is closed, and the breaker tripping outlet relay coil TJ is powered on. After the breaker trip outlet relay coil TJ is electrified, the normally open contact TJ1 of the first breaker trip outlet relay is closed, the first breaker trip holding relay coil TBJ1 and the first trip coil TQ1 are electrified, the trip circuit is closed, the breaker operating mechanism acts, and the main transformer high-voltage side breaker trips. Meanwhile, after the breaker tripping outlet relay coil TJ is electrified, the normally open contact TJ2 of the second breaker tripping outlet relay is closed, the second breaker tripping holding relay coil TBJ and the second tripping coil TQ2 are electrified, the tripping circuit is switched on, the breaker operating mechanism acts, and the main transformer low-voltage side breaker trips.
Therefore, through the process, the main transformer body heavy gas protection circuit provided by the embodiment of the invention can realize tripping of the circuit breaker when serious faults occur in the transformer, and cut off power supply of the transformer. And the gas relay electric contact comprises two electric contacts connected in series, the two electric contacts are closed simultaneously to trigger the subsequent tripping action, so that the stability and the safety are higher, and the misoperation phenomenon is avoided.
The direct current power supply can be 220V voltage, and is convenient to acquire.
Optionally, the second branch is connected in series with the first trip link LP1, the third branch is connected in series with the second trip link LP2, and the fourth branch is connected in series with the third trip link LP3. When the main transformer body heavy gas protection circuit normally operates, the first tripping connection piece LP1, the second tripping connection piece LP2 and the third tripping connection piece LP3 are in a closed communication state. Under the conditions of new main transformer operation, large modification during power transmission operation, protection plug-in replacement, oiling and the like, the first tripping connection piece, the second tripping connection piece LP2 and the third tripping connection piece LP3 are opened, the main transformer body heavy gas protection circuit enters a non-working state, the safety performance is improved, and unnecessary tripping faults can be avoided.
In the embodiment of the invention, the electric contact of the gas relay is QYJ1-80 type gas relay or QJ-80 type gas relay. The gas relay with the two types is a double-tripping and double-signal gas relay, and can meet the use requirements. The connection relationship between the first electrical contact WSJ1 of the gas relay and the second electrical contact WSJ2 of the gas relay can be seen in fig. 1.
In a second aspect, an embodiment of the present invention provides a main transformer body heavy gas protection method, where the method includes:
when the internal fault of the transformer oil tank reaches a preset degree, the electric contact of the gas relay is closed, and the heavy gas relay coil J is powered.
After the heavy gas relay coil J is powered on, the normally open contact J1 of the heavy gas relay is closed, and the breaker tripping outlet relay coil TJ is powered on.
After the breaker trip outlet relay coil TJ is electrified, the normally open contact TJ1 of the first breaker trip outlet relay is closed, the first breaker trip holding relay coil TBJ1 and the first trip coil TQ1 are electrified, the trip circuit is closed, the breaker operating mechanism acts, and the main transformer high-voltage side breaker trips.
After the breaker tripping outlet relay coil TJ is electrified, the normally open contact TJ2 of the second breaker tripping outlet relay is closed, the second breaker tripping holding relay coil TBJ and the second tripping coil TQ2 are electrified, the tripping circuit is switched on, the breaker operating mechanism acts, and the main transformer low-voltage side breaker trips.
Through the process, the main transformer body heavy gas protection method provided by the embodiment of the invention can realize that the circuit breaker trips to cut off the power supply of the transformer when serious faults occur in the transformer. And the gas relay electric contact comprises two electric contacts connected in series, the two electric contacts are closed simultaneously to trigger the subsequent tripping action, so that the stability and the safety are higher, and the misoperation phenomenon is avoided.
Further, the method further comprises: when the main transformer body heavy gas protection circuit normally operates, the first tripping connection piece LP1, the second tripping connection piece LP2 and the third tripping connection piece LP3 are in a closed communication state. Under the conditions of new main transformer operation, large modification during power transmission operation, protection plug-in replacement, oiling and the like, the first tripping connection piece, the second tripping connection piece LP2 and the third tripping connection piece LP3 are opened, the main transformer body heavy gas protection circuit enters a non-working state, the safety performance is improved, and unnecessary tripping faults can be avoided.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In this context, "front", "rear", "left", "right", "upper" and "lower" are referred to with respect to the placement state shown in the drawings.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting thereof; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. Main transformer body heavy gas protection circuit, characterized by, include: the system comprises a direct current power supply, a gas relay electric contact, a microcomputer protection measurement and control device, a first breaker auxiliary normally open contact, a second breaker auxiliary normally open contact, a first tripping coil and a second tripping coil;
the gas relay electrical contact comprises two electrical contacts connected in series;
the microcomputer protection measurement and control device comprises a heavy gas relay coil, a heavy gas relay normally open contact, a breaker tripping outlet relay coil, a first breaker tripping outlet relay normally open contact, a second breaker tripping outlet relay normally open contact, a first breaker tripping holding relay coil and a second breaker tripping holding relay coil, wherein when the heavy gas relay coil is powered on, the heavy gas relay normally open contact is closed, and when the breaker tripping outlet relay coil is powered on, the first breaker tripping outlet relay normally open contact and the second breaker tripping outlet relay normally open contact are closed;
the gas relay electrical contact and the heavy gas relay coil are connected in series to be used as a first branch, the heavy gas relay normally open contact and the breaker tripping outlet relay coil are connected in series to be used as a second branch, the first breaker tripping outlet relay normally open contact, the first breaker tripping holding relay coil, the first breaker auxiliary normally open contact and the first tripping coil are connected in series to be used as a third branch, the second breaker tripping outlet relay normally open contact, the second breaker tripping holding relay coil, the second breaker auxiliary normally open contact and the second tripping coil are connected in series to be used as a fourth branch, and the first branch, the second branch, the third branch and the fourth branch are connected in parallel with the direct current power supply;
the second branch is connected with the first tripping connection piece in series, the third branch is connected with the second tripping connection piece in series, and the fourth branch is connected with the third tripping connection piece in series.
2. The main transformer body heavy gas protection circuit according to claim 1, wherein the gas relay electrical contact is an electrical contact of a QYJ-80 type gas relay or a QJ-80 type gas relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910137529.0A CN109830938B (en) | 2019-02-25 | 2019-02-25 | Main transformer body heavy gas protection circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910137529.0A CN109830938B (en) | 2019-02-25 | 2019-02-25 | Main transformer body heavy gas protection circuit and method |
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| Publication Number | Publication Date |
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| CN109830938A CN109830938A (en) | 2019-05-31 |
| CN109830938B true CN109830938B (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910137529.0A Active CN109830938B (en) | 2019-02-25 | 2019-02-25 | Main transformer body heavy gas protection circuit and method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111416325A (en) * | 2020-03-30 | 2020-07-14 | 山东钢铁股份有限公司 | Transformer heavy gas protection external trip circuit |
Citations (5)
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|---|---|---|---|---|
| GB393577A (en) * | 1930-11-26 | 1933-05-26 | British Thomson Houston Co Ltd | Improvements in and relating to protective apparatus for electric systems |
| CN203312765U (en) * | 2013-05-16 | 2013-11-27 | 安徽电力铜陵县供电有限责任公司 | An apparatus used for eliminating influence of an induction voltage on transformer microcomputer protection |
| CN206023179U (en) * | 2016-08-30 | 2017-03-15 | 陕西北元化工集团有限公司 | A kind of Transformer Heavy Gas protect electric loop |
| CN107046272A (en) * | 2017-06-15 | 2017-08-15 | 国网山西省电力公司电力科学研究院 | Circuit breaker emergency trip control circuit and control method after all DC power disappears |
| CN209358237U (en) * | 2019-02-25 | 2019-09-06 | 山东钢铁股份有限公司 | Heavy gas protection circuit of the main transformer body |
-
2019
- 2019-02-25 CN CN201910137529.0A patent/CN109830938B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB393577A (en) * | 1930-11-26 | 1933-05-26 | British Thomson Houston Co Ltd | Improvements in and relating to protective apparatus for electric systems |
| CN203312765U (en) * | 2013-05-16 | 2013-11-27 | 安徽电力铜陵县供电有限责任公司 | An apparatus used for eliminating influence of an induction voltage on transformer microcomputer protection |
| CN206023179U (en) * | 2016-08-30 | 2017-03-15 | 陕西北元化工集团有限公司 | A kind of Transformer Heavy Gas protect electric loop |
| CN107046272A (en) * | 2017-06-15 | 2017-08-15 | 国网山西省电力公司电力科学研究院 | Circuit breaker emergency trip control circuit and control method after all DC power disappears |
| CN209358237U (en) * | 2019-02-25 | 2019-09-06 | 山东钢铁股份有限公司 | Heavy gas protection circuit of the main transformer body |
Non-Patent Citations (2)
| Title |
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| 主变重瓦斯跳闸接点并联改串联改造方法;蒋祖立;刘露露;;电工技术(第11期);第137-138、141页 * |
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