CN110912079B - Method for switching secondary current loop of CT (current transformer) during operation of bypass transformer switch - Google Patents
Method for switching secondary current loop of CT (current transformer) during operation of bypass transformer switch Download PDFInfo
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- CN110912079B CN110912079B CN201911064158.4A CN201911064158A CN110912079B CN 110912079 B CN110912079 B CN 110912079B CN 201911064158 A CN201911064158 A CN 201911064158A CN 110912079 B CN110912079 B CN 110912079B
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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
- H02H7/045—Differential protection of transformers
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Abstract
The invention provides a bypass and replace the transformer switch to run CT secondary current loop switching method, include in main change-over switch and bypass switch CT secondary current loop, the connected state is open circuit and set as the switching target, the connected state is conducted and set as the target; the main transformer protection device exits the protection state; connecting a differential protection function connecting sheet in the target object in a short circuit manner, grounding the connecting sheet, and disconnecting the target object from the main transformer protection device; removing short circuits among four differential protection function connecting sheets in a switching object, connecting the short circuits with a main transformer protection device, and further carrying out abnormal detection on the connection; after the detection is normal, the main transformer protection device is put into a protection state, so that the switching object and the main transformer protection device are connected, the switching object is changed from open circuit to conduction, and the target object is changed from conduction to open circuit. The implementation of the invention can overcome the problems existing before and after the switching of the existing CT secondary current loop and discover hidden troubles in time.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a method for switching a secondary current loop of a bypass CT (current transformer) instead of a transformer switch.
Background
The transformer substation is constructed with complete side intervals, and the functions of the transformer substation are mainly that the complete side intervals are adopted for replacement when certain intervals of the transformer substation need to be overhauled on the premise of not stopping power supply and not influencing power supply of users. At present, the bypass circuit interval is replaced by a whole set (comprising protection, switch, operation loop, CT loop and the like), and the bypass circuit interval can only replace the switch and can not replace the protection, namely, a main transformer required by a load can not be stopped when the switch of the transformer needs to be overhauled.
As shown in fig. 1, a schematic connection diagram of a main transformer of a transformer substation using a side gap in the prior art is shown. In order to overhaul the main transformer switch, a bypass switch is used instead, so that a current loop for protecting the transformer needs to be switched. In fig. 1, the transformer is in a normal operation state in which differential protection function connection sheets 1QPA, 1QPB, 1QPC, 1QPN on a main transformer protection panel of the main transformer protection device communicate with three CT transformers sleeved by buses 1M and 2M outside a protection side to form a main transformer switch CT secondary current loop and switch-in protection, and three CT transformers sleeved by a bypass bus PM communicate with a bypass switch CT secondary current loop formed by communication of differential protection function connection sheets 2QPA, 2QPB, 2QPC, 2QPN of the main transformer protection panel to perform short circuit, that is, the differential protection function connection sheets 2QPA, 2QPB, 2QPC of the main transformer protection panel are all short-circuited with the differential protection function connection sheet 2QPN to prevent the bypass switch CT secondary current loop from being open-circuited, so as to avoid potential safety hazards caused by electric shock due to misoperation. On the contrary, when the main transformer protection screen is switched on, the connecting pieces 2QPA, 2QPB, 2QPC, 2QPN of the main transformer protection screen are communicated to the outside of the protection side with the three CT transformers sleeved by the bypass bus PM to form a bypass switch CT secondary current loop and switch-in protection, and the main transformer switch CT secondary current loop is short-circuited, that is, the differential protection function connecting pieces 1QPA, 1QPB, 1QPC of the main transformer protection screen and the differential protection function connecting piece 1QPN are short-circuited to prevent the main transformer switch CT secondary current loop from being open-circuited. The CJ 1-CJ 3 are three differential protection relays for providing differential protection signals to a differential protection operation circuit in the main transformer protection device.
However, regardless of the prevention, many problems often arise during operation: (1) before switching of a CT secondary current loop, a differential protection function connecting sheet is not withdrawn temporarily, so that protection misoperation is caused (due to the fact that deviation exists in careless operation in the operation process, differential current is generated, and the protection misoperation is caused); (2) in the process of switching the CT secondary current loop, a CT open-circuit prevention measure is not made, so that a CT secondary open circuit is caused, and workers are electrically injured; (3) after the CT secondary current loop is switched, whether the protection is abnormal or not is not checked, and a differential protection function connecting sheet is input blindly to cause protection misoperation (because the protection misoperation is not reset due to the fact that deviation exists in the operation process and differential current is generated); (4) during the whole operation of switching the secondary current loop of the CT, it is not guaranteed that only one point of the loop is grounded.
Therefore, the method for switching the secondary current loop of the CT operated by the bypass instead of the transformer switch can overcome the problems existing before and after the switching of the conventional secondary current loop of the CT and timely find hidden dangers.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method for switching a secondary current loop of a CT operating by-pass transformer switch, which can overcome the problems existing before and after the switching of the existing secondary current loop of the CT and find hidden troubles in time.
In order to solve the technical problem, an embodiment of the present invention provides a method for switching a secondary current loop of a bypass transformer switch operation CT, which is used in a transformer substation with a bypass interval adopted by a main transformer; wherein, the transformer substation includes:
a main transformer which is connected with the main bus or the bypass bus to supply power to the user side;
a main transformer protection device; the main transformer protection device comprises a main transformer protection screen, wherein differential protection functional connecting sheets 1QPA, 1QPB, 1QPC, 1QPN, 2QPA, 2QPB, 2QPC and 2QPN and three differential protection relays CJ 1-CJ 3 are formed on the main transformer protection screen; after being connected in series to the ground, the differential protection function connecting pieces 1QPN and 2QPN are connected to the differential protection function connecting pieces 1QPA and 2QPA connected in series to the differential protection relay CJ1 to the protection side, connected to the differential protection function connecting pieces 1QPB and 2QPB connected in series to the differential protection relay CJ2 to the protection side, and connected to the differential protection relay CJ3 to the protection side;
a main transformer switch CT secondary current loop; the main transformer switch CT secondary current loop is formed by respectively communicating four differential protection function connecting sheets 1QPA, 1QPB, 1QPC and 1QPN on the main transformer protection screen to the outside of a protection side with three CT transformers sleeved with the main bus; and
a bypass switch CT secondary current loop; the bypass switch CT secondary current loop is formed by respectively communicating three CT transformers sleeved with the bypass bus to the outside of a protection side by another four differential protection function connecting sheets 2QPA, 2QPB, 2QPC and 2QPN on the main transformer protection screen;
the main transformer switch CT secondary current loop and the bypass switch CT secondary current loop are different in communication state; the connected state comprises a conducting state and an open circuit state;
wherein the method comprises the steps of:
in the main transformer switch CT secondary current loop and the bypass switch CT secondary current loop, setting the CT secondary current loop with the open connection state as a switching object, and setting the CT secondary current loop with the conduction state as a target object correspondingly replaced by the switching object;
the main transformer protection device is quitted from a protection state, so that the connection between the switching object and the target object and the main transformer protection device is disconnected;
the four differential protection function connecting sheets in the target object are in short circuit and are grounded, and the four differential protection function connecting sheets of the target object are disconnected with three differential protection relays on a main transformer protection screen of a main transformer protection device;
removing short circuits among four differential protection function connecting sheets in the switching object, connecting the short circuits with three differential protection relays on a main transformer protection screen of a main transformer protection device, and further performing abnormity detection on the connection between the switching object and the main transformer protection device;
after the detection is normal, the main transformer protection device is put into a protection state, the switching object and the main transformer protection device are connected, the communication state of the switching object is changed from open circuit to conduction, and the communication state of the target object is changed from conduction to open circuit.
The main transformer protection device is in a protection state of quitting or putting into the protection state, and the quitting or putting into of the protection hard function pressing plate of the main transformer protection device is controlled to be achieved.
The short circuit of the four differential protection function connecting sheets in the target object is realized by connecting the adjacent standby short connecting sheets one by one.
Wherein the method further comprises:
and performing functional test on the connection between the switching object and the main transformer protection device.
The functional test comprises a main transformer protection screen protection outlet pressing plate exit test, a bypass interval switch combination test, a transformer switch shearing test and a protection and protection fixed value abnormity test of the main transformer protection device.
The embodiment of the invention has the following beneficial effects:
1. before switching of a CT secondary current loop, the main transformer protection device is quitted from a protection state, so that the problem of protection misoperation caused by temporary quitting of a differential protection function connecting sheet is solved;
2. in the process of switching the CT secondary current loop, the main transformer protection device is quitted from the protection state, and the four differential protection function connecting sheets in the target object are in short circuit and are grounded, so that the open circuit secondary open circuit of the CT is prevented, and workers are prevented from being electrically injured;
3. according to the invention, before the main transformer protection device is put into a protection state, the connection between a switching object and the main transformer protection device is subjected to abnormal detection, so that the phenomenon of protection misoperation caused by blindly putting a differential protection function connecting sheet into the protection device due to the existence of abnormal protection without inspection is avoided;
4. in the whole work of switching the CT secondary current loop, the invention carries out short circuit and grounding on four differential protection function connecting sheets in a target object to ensure that only one point of the loop is grounded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a main transformer of a transformer station using a side gap connection in the prior art;
fig. 2 is a flowchart of a method for switching a secondary current loop of a CT operating with a bypass transformer switch according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, a method for switching a secondary current loop of a bypass transformer operating CT instead of a transformer switch according to an embodiment of the present invention is applied to a transformer substation with a main transformer at a bypass interval, as shown in fig. 1; wherein, the transformer substation includes:
a main transformer which is connected with the main bus or the bypass bus to supply power to the user side;
a main transformer protection device; the main transformer protection device comprises a main transformer protection screen, wherein differential protection function connecting sheets 1QPA, 1QPB, 1QPC, 1QPN, 2QPA, 2QPB, 2QPC and 2QPN and three differential protection relays CJ 1-CJ 3 are formed on the main transformer protection screen; after being connected in series to the ground, the differential protection function connecting pieces 1QPN and 2QPN are connected to the differential protection function connecting pieces 1QPA and 2QPA connected in series to the differential protection relay CJ1 to the protection side, connected to the differential protection function connecting pieces 1QPB and 2QPB connected in series to the differential protection relay CJ2 to the protection side, and connected to the differential protection relay CJ3 to the protection side;
a main transformer switch CT secondary current loop; the main transformer switch CT secondary current loop is formed by four differential protection function connecting sheets 1QPA, 1QPB, 1QPC and 1QPN on a main transformer protection screen respectively communicating three CT transformers (for example ABC three-phase CT transformers sleeved on 1M and 2M access main transformer lines) sleeved with a main bus (for example 1M and 2M) to the outside of a protection side; and
a bypass switch CT secondary current loop; the bypass switch CT secondary current loop is formed by three CT transformers (for example, ABC three-phase CT transformers sleeved on PM access main transformer lines) which are respectively communicated with a bypass bus (for example, PM) to the outside of a protection side by another four differential protection function connecting sheets 2QPA, 2QPB, 2QPC and 2QPN on the main transformer protection screen;
the main transformer switch CT secondary current loop and the bypass switch CT secondary current loop are different in communication state; the connected state comprises a conducting state and an open circuit state;
wherein the method comprises the steps of:
step S1, in the main transformer switch CT secondary current loop and the bypass switch CT secondary current loop, setting the CT secondary current loop whose connected state is open as a switching object, and setting the CT secondary current loop whose connected state is conductive as a target object to be replaced by the switching object;
the specific process is that the conducted CT secondary current loop and the open CT secondary current loop are mutually cut, so that whether the whole CT secondary current loop switching process is correct or not is verified, and in the switching process, the problems in the prior art can be solved. Namely, the CT secondary current loop which is open in the communication state is switched to be conducted, the CT secondary current loop which is open in the communication state is switched to be open, and the correctness and the stability of the main transformer protection device are ensured in the switching process.
In one embodiment, the main transformer switch CT secondary current loop is connected and the bypass switch CT secondary current loop is open, so that the bypass switch CT secondary current loop is set as a switching object and the main transformer switch CT secondary current loop is set as a target object during the inter-switching process; and vice versa.
Step S2, the main transformer protection device is quitted from the protection state, and the connection between the switching object and the target object and the main transformer protection device is disconnected;
the specific process is that before the CT secondary current loop is switched, the main transformer protection device is quitted from the protection state, so that the connection between the switching object and the target object and the main transformer protection device is disconnected, and the problem of protection misoperation caused by temporary quitting of a differential protection function connecting sheet is avoided. It should be noted that the exit or the input of the main transformer protection device to the protection state is realized by controlling the exit or the input of a protection hard function pressing plate of the main transformer protection device.
It can be understood that when the main transformer protection device exits the protection state, the main transformer switch CT secondary current loop and the bypass switch CT secondary current loop are both open circuits, so that potential safety hazards caused by live-line operation can be avoided.
Step S3, short-circuiting and grounding four differential protection function connecting sheets in the target object, and disconnecting the four differential protection function connecting sheets of the target object from three differential protection relays on a main transformer protection screen of the main transformer protection device;
the specific process is that four differential protection function connecting sheets in a target object are connected one by connecting the adjacent standby short connecting sheets, and the circuit is ensured to be grounded only at one point, so that the CT open circuit secondary open circuit is prevented, and workers are prevented from being electrically injured; and simultaneously, the four differential protection function connecting sheets of the target object are disconnected with three differential protection relays on a main transformer protection screen of the main transformer protection device.
In one embodiment, if the target object is the main transformer switch CT secondary current loop, the differential protection functional connection pads 1QPA, 1QPB, 1QPC, and 1QP N are connected one by one through the backup shorting pads to realize short circuit, and are grounded through the differential protection functional connection pad 1QPN, so that the connections between the differential protection functional connection pads 1QPA, 1QPB, 1QPC, and 1QP N and the three differential protection relays CJ1 to CJ3 are disconnected.
In another embodiment, if the target object is the bypass switch CT secondary current loop, the differential protection functional connection pads 2QPA, 2QPB, 2QPC, 2QP N are connected one by one through the spare shorting pads to realize short circuit, and are grounded through the differential protection functional connection pad 2QPN, so that the connections between the differential protection functional connection pads 2QPA, 2QPB, 2QPC, 2QP N and the three differential protection relays CJ1 to CJ3 are disconnected.
Step S4, removing short circuits among four differential protection function connecting sheets in the switching object, connecting the short circuits with three differential protection relays on a main transformer protection screen of a main transformer protection device, and further carrying out abnormal detection on the connection between the switching object and the main transformer protection device;
the specific process is that short circuits among four differential protection function connecting sheets in a switching object are removed and are connected with three differential protection relays on a main transformer protection screen of a main transformer protection device, and the connection between the switching object and the main transformer protection device is further subjected to abnormal detection, so that the phenomenon of protection misoperation caused by the fact that the differential protection function connecting sheets are input blindly due to the fact that whether abnormal protection exists or not is avoided.
In one embodiment, when the switching target is the bypass switch CT secondary current circuit, the differential protection function connection piece 2QPN is removed from the ground, short-circuited connection piece 2 QPN-circuited short-circuited connection piece 2-circuited short-circuited CJ 1-circuited short-circuited.
In one embodiment, when the switching target is the main switch CT secondary current circuit, the differential protection function connection piece 1QPN is removed from the ground, short-circuited connection piece 1QPN connected with three differential protection function-circuited connection pieces 1 CJ1, 1q, 1, and 1, and 1 and three differential protection relay CJ1 to CJ3 are further connected.
And step S5, after the detection result is normal, the main transformer protection device is put into a protection state, the switching object and the main transformer protection device are connected, the communication state of the switching object is changed from open circuit to conduction, and the communication state of the target object is changed from conduction to open circuit.
The specific process is that after the detection is normal, the main transformer protection device is put into a protection state, the switching object and the main transformer protection device are connected, the communication state of the switching object is changed from open circuit to conduction, and the communication state of the target object is changed from conduction to open circuit.
In one embodiment, if the target object is a main switch CT secondary current loop and the switching object is a bypass switch CT secondary current loop, after the switching process is completed, the main switch CT secondary current loop is changed from open to open, and the bypass switch CT secondary current loop is changed from open to open.
In another embodiment, if the target object is the bypass switch CT secondary current loop and the switching object is the main switch CT secondary current loop, after the switching process is completed, the bypass switch CT secondary current loop is changed from open to open, and the main switch CT secondary current loop is changed from open to open.
In an embodiment of the invention, the method further comprises:
and performing functional test on the connection between the switching object and the main transformer protection device. The functional test comprises a main transformer protection screen protection outlet pressing plate exit test, a bypass interval switch combination test, a transformer switch shearing test, a protection and protection fixed value abnormity test and the like of the main transformer protection device.
The embodiment of the invention has the following beneficial effects:
1. before switching of a CT secondary current loop, the main transformer protection device is quitted from a protection state, so that the problem of protection misoperation caused by temporary quitting of a differential protection function connecting sheet is solved;
2. in the process of switching the CT secondary current loop, the main transformer protection device is quitted from the protection state, and the four differential protection function connecting sheets in the target object are in short circuit and are grounded, so that the open circuit secondary open circuit of the CT is prevented, and workers are prevented from being electrically injured;
3. according to the invention, before the main transformer protection device is put into a protection state, the connection between a switching object and the main transformer protection device is subjected to abnormal detection, so that the phenomenon of protection misoperation caused by blindly putting a differential protection function connecting sheet into the protection device due to the existence of abnormal protection without inspection is avoided;
4. in the whole work of switching the CT secondary current loop, the invention carries out short circuit and grounding on four differential protection function connecting sheets in a target object to ensure that only one point of the loop is grounded.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (5)
1. A bypass replaces the transformer switch to operate the secondary current loop switching method of CT, is used in the main transformer and adopts the side spaced on the converting station; wherein, the transformer substation includes:
a main transformer which is connected with the main bus or the bypass bus to supply power to the user side;
a main transformer protection device; the main transformer protection device comprises a main transformer protection screen, wherein differential protection functional connecting sheets 1QPA, 1QPB, 1QPC, 1QPN, 2QPA, 2QPB, 2QPC and 2QPN and three differential protection relays CJ 1-CJ 3 are formed on the main transformer protection screen; after being connected in series to the ground, the differential protection function connecting pieces 1QPN and 2QPN are connected to the differential protection function connecting pieces 1QPA and 2QPA connected in series to the differential protection relay CJ1 to the protection side, connected to the differential protection function connecting pieces 1QPB and 2QPB connected in series to the differential protection relay CJ2 to the protection side, and connected to the differential protection relay CJ3 to the protection side;
a main transformer switch CT secondary current loop; the main transformer switch CT secondary current loop is formed by respectively communicating four differential protection function connecting sheets 1QPA, 1QPB, 1QPC and 1QPN on the main transformer protection screen to the outside of a protection side with three CT transformers sleeved with the main bus; and
a bypass switch CT secondary current loop; the bypass switch CT secondary current loop is formed by respectively communicating three CT transformers sleeved with the bypass bus to the outside of a protection side by another four differential protection function connecting sheets 2QPA, 2QPB, 2QPC and 2QPN on the main transformer protection screen;
the main transformer switch CT secondary current loop and the bypass switch CT secondary current loop are different in communication state; the connected state comprises a conducting state and an open circuit state;
characterized in that the method comprises the following steps:
in the main transformer switch CT secondary current loop and the bypass switch CT secondary current loop, setting the CT secondary current loop with the open connection state as a switching object, and setting the CT secondary current loop with the conduction state as a target object correspondingly replaced by the switching object;
the main transformer protection device is quitted from a protection state, so that the connection between the switching object and the target object and the main transformer protection device is disconnected;
the four differential protection function connecting sheets in the target object are in short circuit and are grounded, and the four differential protection function connecting sheets of the target object are disconnected with three differential protection relays on a main transformer protection screen of a main transformer protection device;
removing short circuits among four differential protection function connecting sheets in the switching object, connecting the short circuits with three differential protection relays on a main transformer protection screen of a main transformer protection device, and further performing abnormity detection on the connection between the switching object and the main transformer protection device;
after the detection is normal, the main transformer protection device is put into a protection state, the switching object and the main transformer protection device are connected, the communication state of the switching object is changed from open circuit to conduction, and the communication state of the target object is changed from conduction to open circuit.
2. The method for switching the secondary current loop of the bypass transformer-replacing switch operating CT as recited in claim 1, wherein the exit or the switch-in protection state of the main transformer protection device is realized by controlling the exit or the switch-in of a protection hard function pressing plate of the main transformer protection device.
3. The method for switching the secondary current loop of the bypass transformer switch operation CT according to claim 1, wherein the short-circuiting of the four differential protection function connection pads in the target object is performed by connecting the spare short-circuit connection pads one by one.
4. The method of claim 1 for operating a CT secondary current loop switching instead of a transformer switch, the method further comprising:
and performing functional test on the connection between the switching object and the main transformer protection device.
5. The method of claim 4, wherein the functionality test comprises: the main transformer protection screen protection outlet pressure plate exit test, the bypass interval switch combination test, the shear transformer switch test and the protection constant value abnormity test of the main transformer protection device.
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| CN201911064158.4A CN110912079B (en) | 2019-11-04 | 2019-11-04 | Method for switching secondary current loop of CT (current transformer) during operation of bypass transformer switch |
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| CN112072618B (en) * | 2020-08-03 | 2023-01-24 | 广东电网有限责任公司 | Main transformer CT secondary current linkage switching terminal with single bus provided with bypass |
| CN114360310B (en) * | 2021-11-29 | 2024-02-06 | 深圳供电局有限公司 | Main transformer circuit current transformer circuit switching training device |
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| CN101854052A (en) * | 2010-02-08 | 2010-10-06 | 广东电网公司中山供电局 | Sampling data passageway switching method and device in main transformer protection of digitalized substation |
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| JPH1189080A (en) * | 1997-09-10 | 1999-03-30 | Toshiba Corp | Protection relay device |
| CN202178610U (en) * | 2011-09-02 | 2012-03-28 | 广东电网公司深圳供电局 | Switching apparatus of bypass switch for operating TA secondary circuit in replace of main transformer |
| CN207303988U (en) * | 2017-09-06 | 2018-05-01 | 国家电网公司 | A kind of anti-secondary current circuit open circuit set of banked relay type |
| CN109473895B9 (en) * | 2018-10-09 | 2020-09-08 | 深圳供电局有限公司 | Correct short circuit operation method for current loop in bus protection, overhaul and maintenance |
| CN109713646B (en) * | 2018-11-30 | 2020-02-21 | 南京国电南自电网自动化有限公司 | Bus failure protection switching method based on main disconnecting link with main transformer beside main disconnecting link |
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| CN101854052A (en) * | 2010-02-08 | 2010-10-06 | 广东电网公司中山供电局 | Sampling data passageway switching method and device in main transformer protection of digitalized substation |
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