CN218788085U - Zero sequence voltage monitoring device - Google Patents
Zero sequence voltage monitoring device Download PDFInfo
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- CN218788085U CN218788085U CN202223065542.6U CN202223065542U CN218788085U CN 218788085 U CN218788085 U CN 218788085U CN 202223065542 U CN202223065542 U CN 202223065542U CN 218788085 U CN218788085 U CN 218788085U
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Abstract
The embodiment of the application provides a zero sequence voltage monitoring device, which comprises a first voltage relay and a second voltage relay; the coil of the first voltage relay is used for being connected with a first bus voltage transformer secondary winding and a second bus voltage transformer secondary winding of a bus voltage transformer secondary opening triangular winding in parallel; and a coil of the second voltage relay is used for being connected with a second bus voltage transformer secondary winding and a third bus voltage transformer secondary winding of the bus voltage transformer secondary opening triangular winding in parallel. When the system normally operates, if the zero sequence voltage loop is intact, the first voltage relay and the second voltage relay are started. If the zero sequence voltage loop is broken, the voltage born by at least one voltage relay is smaller than the starting value, and the voltage relay is not started at the moment, so that the real-time monitoring of the zero sequence voltage is realized, and the problem that the monitoring of the zero sequence voltage is difficult when the system normally runs is solved.
Description
Technical Field
The application relates to the technical field of substation equipment, in particular to a zero sequence voltage monitoring device.
Background
The zero sequence voltage of the transformer substation is generated from the open end of the secondary open triangular winding of the bus voltage transformer of the bus, when the system normally operates, the sum of three-phase voltage vectors is zero, and the open end of the secondary open triangular winding of the bus voltage transformer has no zero sequence voltage. When a system has a ground fault, zero sequence voltage is generated at the opening end of the secondary opening triangular winding of the bus voltage transformer.
In the system, due to the reasons that the auxiliary contact of the isolating switch of the bus voltage transformer is poor in contact, the contact of the zero-sequence voltage circuit switching relay of the PT parallel device is blown and the like, the zero-sequence voltage circuit is disconnected occasionally. When the system normally operates, the zero sequence voltage is unbalanced voltage, generally about 0-5V, and changes along with the load. When the zero sequence voltage loop is broken, the voltage value is similar to that in normal operation due to the influence of the induction voltage.
Therefore, the zero sequence voltage circuit disconnection is difficult to be found when the system normally operates.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a zero sequence voltage monitoring device, which solves the problem that the existing zero sequence voltage is difficult to monitor when a system normally operates, and realizes the real-time monitoring of the zero sequence voltage.
The embodiment of the application provides a zero sequence voltage monitoring device, which comprises a first voltage relay and a second voltage relay;
the coil of the first voltage relay is used for being connected with a first bus voltage transformer secondary winding and a second bus voltage transformer secondary winding of a bus voltage transformer secondary opening triangular winding in parallel;
and a coil of the second voltage relay is used for being connected with a secondary winding of a second bus voltage transformer and a secondary winding of a third bus voltage transformer of the secondary opening triangular winding of the bus voltage transformer in parallel.
In a feasible implementation mode, the normally closed auxiliary contacts of the first voltage relay and the second voltage relay are connected in parallel and then are connected into an open signal loop of the measurement and control device.
In a feasible implementation manner, after being connected in series with the first fuse, a coil of the first voltage relay is connected in parallel with a first bus voltage transformer secondary winding and a second bus voltage transformer secondary winding of the bus voltage transformer secondary opening triangular winding.
In a feasible implementation manner, after being connected in series with the second fuse, a coil of the second voltage relay is connected in parallel with a secondary winding of the second bus voltage transformer and a secondary winding of the third bus voltage transformer of the secondary open triangular winding of the bus voltage transformer.
In a feasible implementation manner, two ends of the coil of the first voltage relay are respectively and electrically connected with the wiring head end of the secondary open triangular winding of the bus voltage transformer and the wiring head end of the secondary winding of the third bus voltage transformer through wires.
In a feasible implementation manner, two ends of the coil of the second voltage relay are electrically connected with the wiring tail end of the secondary open triangular winding of the bus voltage transformer and the wiring tail end of the secondary winding of the first bus voltage transformer respectively through conducting wires.
According to the zero sequence voltage monitoring device provided by the embodiment of the application, a coil of a first voltage relay is connected in parallel between the wiring head end of a secondary opening triangular winding of a bus voltage transformer and the wiring head end of a secondary winding of a third bus voltage transformer to form a loop; and connecting the coil of the second voltage relay in parallel between the wiring tail end of the secondary opening triangular winding of the bus voltage transformer and the wiring tail end of the secondary winding of the first bus voltage transformer to form a loop. When the system normally operates, if the zero sequence voltage loop is intact, the voltage born by the first voltage relay and the second voltage relay is larger than or equal to the starting value, and the first voltage relay and the second voltage relay are started. If the zero sequence voltage loop is broken, the voltage born by at least one voltage relay (the first voltage relay or the second voltage relay) is smaller than the starting value, and the voltage relay is not started at the moment, so that the real-time monitoring of the zero sequence voltage is realized, and the problem that the zero sequence voltage is difficult to monitor when the system normally runs is solved.
Drawings
Fig. 1 is a schematic diagram of a zero sequence voltage monitoring apparatus provided in an embodiment of the present application;
fig. 2 is a schematic signal circuit wiring diagram of a zero-sequence voltage monitoring apparatus according to an embodiment of the present application;
fig. 3 is a schematic diagram of a zero sequence voltage monitoring apparatus provided in another embodiment of the present application;
fig. 4 is a schematic diagram of a zero sequence voltage monitoring apparatus according to still another embodiment of the present application.
Description of reference numerals:
11. a first voltage relay; 12 a second voltage relay; 13. a measurement and control device; 14. a first fuse; 15. a second fuse;
21. a first bus voltage transformer secondary winding; 22. a second bus voltage transformer secondary winding; 23. a secondary winding of a third bus voltage transformer; 24. a first connecting line; 25. and a second connecting line.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a schematic diagram of a zero sequence voltage monitoring apparatus according to an embodiment of the present application.
Referring to fig. 1, an embodiment of the present application provides a zero sequence voltage monitoring apparatus, including a first voltage relay 11 and a second voltage relay 12; the coil of the first voltage relay 11 is used for being connected in parallel with a first bus voltage transformer secondary winding 21 and a second bus voltage transformer secondary winding 22 of a bus voltage transformer secondary opening triangular winding; the coil of the second voltage relay 12 is used to connect in parallel with the second bus voltage transformer secondary winding 22 and the third bus voltage transformer secondary winding 23 of the bus voltage transformer secondary open delta winding.
As a specific embodiment, as shown in fig. 1, in this embodiment, two ends of the coil of the first voltage relay 11 are electrically connected to the connection head end L630 of the bus voltage transformer secondary open delta winding and the connection head end da of the third bus voltage transformer secondary winding respectively through wires, and the first bus voltage transformer secondary winding 21 and the second bus voltage transformer secondary winding 22 of the bus voltage transformer secondary open delta winding are connected in parallel to the first voltage relay 11. Two ends of a coil of the second voltage relay 12 are respectively and electrically connected with a wiring tail end N600 of the secondary opening triangular winding of the bus voltage transformer and a wiring tail end dn of the secondary winding of the first bus voltage transformer through conducting wires, and the secondary winding 22 of the second bus voltage transformer and the secondary winding 23 of the third bus voltage transformer of the secondary opening triangular winding of the bus voltage transformer are connected with the second voltage relay 12 in parallel.
When the system normally operates, if the zero sequence voltage loop is intact, the voltages borne by the first voltage relay 11 and the second voltage relay 12 are greater than or equal to the starting value, and at this time, the first voltage relay 11 and the second voltage relay 12 can be normally started.
If a disconnection occurs between the connection head end L630 of the secondary open delta winding of the bus voltage transformer and the connection tail end dn of the secondary winding 21 of the first bus voltage transformer (i.e., a disconnection occurs between the terminals ab), the first voltage relay 11 cannot be started because the borne voltage is smaller than the starting value, the voltage borne by the second voltage relay 12 is larger than the starting value, but the second voltage relay 12 can still be started normally.
If a disconnection occurs between the connection head end da of the secondary winding 23 of the third bus voltage transformer and the connection tail end N600 of the secondary open delta winding of the bus voltage transformer (i.e., a disconnection occurs between the two terminals cd), the second voltage relay 12 cannot be started because the borne voltage is smaller than the starting value, the voltage borne by the first voltage relay 11 is larger than the starting value, but the first voltage relay 11 can still be started normally.
If a disconnection occurs between the terminal dn of the secondary winding 21 of the first bus voltage transformer and the terminal da of the secondary winding 23 of the third bus voltage transformer (i.e., a disconnection occurs between bc), the voltages applied to the first voltage relay 11 and the second voltage relay 12 are both lower than the start value, and thus the start cannot be performed.
As can be known from the above analysis, once the zero sequence voltage loop is disconnected during operation, the voltage borne by at least one voltage relay is smaller than the starting value, and at this time, the voltage relay is not started, that is, the voltage borne by the first voltage relay 11 or the second voltage relay 12 is smaller than the starting value. Therefore, the real-time monitoring of the zero sequence voltage is realized, and the problem that the zero sequence voltage is difficult to monitor when the system normally operates is solved.
Fig. 2 is a schematic signal circuit connection diagram of a zero sequence voltage monitoring apparatus according to an embodiment of the present application. Referring to fig. 2, in order to conveniently monitor the zero-sequence voltage in real time and feed back the disconnection information in time. The normally closed auxiliary contact YJa1 of the first voltage relay 11 and the normally closed auxiliary contact YJb of the second voltage relay 12 are connected in parallel and then are connected to an open signal loop of the measurement and control device 13.
When the first voltage relay 11 and the second voltage relay 12 are both started, the normally closed auxiliary contact of the first voltage relay 11 and the normally closed auxiliary contact of the second voltage relay 12 in fig. 2 are both opened, at this time, the signal loop is opened, and the measurement and control device 13 does not send a signal, which indicates that the zero-sequence voltage loop is normal, and there is no wire break.
If a disconnection occurs between the connection head end L630 of the secondary open-delta winding of the bus voltage transformer and the connection tail end dn of the secondary winding 21 of the first bus voltage transformer (at this time, the first voltage relay 11 cannot be started because the borne voltage is smaller than the starting value, and the second voltage relay 12 can be normally started), or a disconnection occurs between the connection head end da of the secondary winding 23 of the third bus voltage transformer and the connection tail end N600 of the secondary open-delta winding of the bus voltage transformer (at this time, the second voltage relay 12 cannot be started because the borne voltage is smaller than the starting value, and the first voltage relay 11 can be normally started), the normally closed auxiliary contact of one voltage relay is opened, and the normally closed auxiliary contact of the other voltage relay is closed. Since the normally closed auxiliary contact YJa of the first voltage relay 11 and the normally closed auxiliary contact YJb of the second voltage relay 12 are in parallel, the signal circuit is turned on as long as the normally closed auxiliary contact of one voltage relay is closed. Therefore, the measurement and control device 13 will send a signal to indicate that the zero sequence voltage loop has a broken line condition, and then the operation and maintenance personnel can check and process the zero sequence voltage loop fault in time according to the signal.
If a disconnection occurs between the connection tail end dn of the secondary winding 21 of the first bus voltage transformer and the connection head end da of the secondary winding 23 of the third bus voltage transformer, at this time, the first voltage relay 11 and the second voltage relay 12 cannot be started because the voltage borne by the two voltage relays is smaller than the starting value, and therefore the normally closed auxiliary contacts of the two voltage relays are both closed. And the signal loop is conducted, the measurement and control device 13 sends a signal to indicate that the zero sequence voltage loop has a broken line condition, and then operation and maintenance personnel check and process the zero sequence voltage loop fault in time according to the signal.
Referring to fig. 1, the zero sequence voltage monitoring apparatus provided in this embodiment further includes a first fuse 14 and a second fuse 15.
The first fuse 14 is connected in series with the first voltage relay 11, that is, after the coil of the first voltage relay 11 is connected in series with the first fuse 14, the coil is connected in parallel between the connection head end L630 of the secondary open triangular winding of the bus voltage transformer and the connection head end da of the secondary winding 23 of the third bus voltage transformer, so as to form a loop, and the loop forms a parallel relation with the secondary winding 21 of the first bus voltage transformer and the secondary winding 22 of the second bus voltage transformer. The second fuse 15 is connected in series with the second voltage relay 12, that is, the coil of the second voltage relay 12 is connected in series with the second fuse 15 and then connected between the wiring tail end N600 of the secondary open triangular winding of the bus voltage transformer and the wiring tail end dn of the secondary winding 21 of the first bus voltage transformer to form a loop, and the loop forms a parallel relation with the secondary winding 22 of the second bus voltage transformer and the secondary winding 23 of the third bus voltage transformer.
By providing the first fuse 14 and the second fuse 15 in the monitoring device, overcurrent protection can be formed for the monitoring device, and damage to the voltage relay and the bus voltage transformer is avoided.
Example two
Fig. 3 is a schematic diagram of a zero sequence voltage monitoring apparatus according to another embodiment of the present application.
Referring to fig. 3, for example, two ends of the coil of the first voltage relay are electrically connected with the first terminal end L630 of the secondary open delta winding of the bus voltage transformer and the tail terminal end dn of the secondary winding 22 of the second bus voltage transformer through wires, respectively, to form a loop. Two ends of the coil of the second voltage relay 12 are respectively and electrically connected with the wiring tail end N600 of the secondary open triangular winding of the bus voltage transformer and the wiring head end da of the secondary winding 22 of the second bus voltage transformer through leads to form a loop.
The rest of the structure is the same as the first embodiment.
EXAMPLE III
Fig. 4 is a schematic diagram of a zero sequence voltage monitoring apparatus according to still another embodiment of the present application.
Referring to fig. 4, for example, the terminal end dn of the first bus voltage transformer secondary winding 21 is electrically connected to the terminal end da of the second bus voltage transformer secondary winding 22 through a first connection line 24, and the terminal end dn of the second bus voltage transformer secondary winding 22 is electrically connected to the terminal end da of the third bus voltage transformer secondary winding 23 through a second connection line 25.
Two ends of the coil of the first voltage relay 11 are electrically connected with the wiring head end L630 of the secondary open delta winding of the bus voltage transformer and the second connecting wire 25 through conducting wires respectively to form a loop. Two ends of the coil of the second voltage relay 12 are respectively and electrically connected with the wiring tail end N600 of the secondary opening triangular winding of the bus voltage transformer and the first connecting wire 24 through wires to form a loop.
The rest of the structure is the same as the first embodiment.
It is understood that a person skilled in the art can combine, split, recombine and the like the embodiments of the present application to obtain other embodiments on the basis of several embodiments provided by the present application, and the embodiments do not depart from the scope of the present application.
The above embodiments are only intended to be specific embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements, and the like made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of the embodiments of the present application.
Claims (6)
1. A zero sequence voltage monitoring device is characterized in that: the device comprises a first voltage relay and a second voltage relay;
the coil of the first voltage relay is used for being connected with a first bus voltage transformer secondary winding and a second bus voltage transformer secondary winding of a bus voltage transformer secondary opening triangular winding in parallel;
and a coil of the second voltage relay is used for being connected with a secondary winding of a second bus voltage transformer and a secondary winding of a third bus voltage transformer of the secondary opening triangular winding of the bus voltage transformer in parallel.
2. The zero sequence voltage monitoring device according to claim 1, characterized in that: the normally closed auxiliary contacts of the first voltage relay and the second voltage relay are connected in parallel and then are connected into an open signal loop of the measurement and control device.
3. The zero sequence voltage monitoring device according to claim 1, characterized in that: and a coil of the first voltage relay is connected in series with the first fuse and then is connected in parallel with a first bus voltage transformer secondary winding and a second bus voltage transformer secondary winding of the bus voltage transformer secondary opening triangular winding.
4. The zero sequence voltage monitoring device according to claim 1, characterized in that: and a coil of the second voltage relay is connected in series with the second fuse and then is connected in parallel with a secondary winding of the second bus voltage transformer and a secondary winding of the third bus voltage transformer of the secondary opening triangular winding of the bus voltage transformer.
5. The zero sequence voltage monitoring device according to claim 1, characterized in that: and two ends of the coil of the first voltage relay are respectively and electrically connected with the wiring head end of the secondary open triangular winding of the bus voltage transformer and the wiring head end of the secondary winding of the third bus voltage transformer through wires.
6. The zero sequence voltage monitoring device of claim 1, wherein: and two ends of a coil of the second voltage relay are respectively and electrically connected with the wiring tail end of the secondary opening triangular winding of the bus voltage transformer and the wiring tail end of the secondary winding of the first bus voltage transformer through leads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223065542.6U CN218788085U (en) | 2022-11-18 | 2022-11-18 | Zero sequence voltage monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223065542.6U CN218788085U (en) | 2022-11-18 | 2022-11-18 | Zero sequence voltage monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218788085U true CN218788085U (en) | 2023-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223065542.6U Active CN218788085U (en) | 2022-11-18 | 2022-11-18 | Zero sequence voltage monitoring device |
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| CN (1) | CN218788085U (en) |
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- 2022-11-18 CN CN202223065542.6U patent/CN218788085U/en active Active
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