CN212518389U - Neutral point grounding structure of multi-section bus system for high-voltage station power station - Google Patents
Neutral point grounding structure of multi-section bus system for high-voltage station power station Download PDFInfo
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- CN212518389U CN212518389U CN202021205304.9U CN202021205304U CN212518389U CN 212518389 U CN212518389 U CN 212518389U CN 202021205304 U CN202021205304 U CN 202021205304U CN 212518389 U CN212518389 U CN 212518389U
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Abstract
The utility model provides a neutral point grounding structure of a high-voltage station service multi-section bus system, which comprises a high-voltage station service transformer and an underground safety bus, wherein the high-voltage station service transformer is connected with an underground load bus, the underground load bus is interconnected with a ground load bus, and the ground load bus is connected with a grounding resistor through a grounding transformer; the utility model discloses under the condition of minimize equipment investment, realize high-pressure station power utilization multistage generating line neutral point through low resistance ground connection, and can amputate power station high-pressure station power utilization multistage generating line system single-phase earth fault fast, be applicable to and set up power station high-pressure station power utilization multistage generating line system.
Description
Technical Field
The utility model relates to an electric power system planning design field, concretely relates to power station high pressure station service power multi-section bus system neutral point grounding structure.
Background
The neutral point of the high-voltage station power system in China is mostly grounded in an ungrounded mode or through an arc suppression coil. By using the arc suppression coil grounding mode, when a single-phase grounding fault occurs, the high-voltage station power system can generally continue to operate for 2 hours, so that the power supply reliability is ensured, but the single-phase grounding fault can be expanded into an accident possibly due to the difficulty in realizing sensitive and selective grounding protection in the grounding mode, and serious property loss is caused.
The main stream design is that a single high-voltage station transformer can carry out whole-plant load operation, while a distribution transformer of an important load generally carries out standby or adopts dual power supply, when a fault occurs, the fault can be rapidly removed, and automatic switching of a power supply is realized by utilizing spare automatic switching, so that the high-voltage station power system has no necessity of carrying out ground fault operation; in addition, the line in the power utilization system is mainly a cable, the cable is non-self-recovery insulation, the single-phase earth fault is generally a permanent fault, if the power utilization system continues to operate, the insulation at the fault position can be rapidly damaged, so that the fault is developed into an interphase short circuit, a power supply must be rapidly cut off, and the accident expansion is avoided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power station high pressure service multi-section bus system neutral point grounding structure, the utility model discloses under the condition of the equipment investment of minimizing, realize high pressure service multi-section bus neutral point through low resistance ground connection, and can amputate power station high pressure service multi-section bus system single-phase earth fault fast, be applicable to and set up power station high pressure service multi-section bus system.
Therefore, the utility model adopts the following technical scheme:
a neutral point grounding structure of a multi-section bus system for a high-voltage station power supply is characterized by comprising a high-voltage station power supply transformer and an underground safety bus, wherein the high-voltage station power supply transformer is connected with an underground load bus, the underground load bus is interconnected with a ground load bus, and the ground load bus is connected with a grounding resistor through a grounding transformer.
Further: the high-voltage service transformer comprises a first high-voltage service transformer and a second high-voltage service transformer.
Further: a high voltage power station transformer connects an underground load generating line through a generating line inlet wire circuit breaker, and an underground load generating line connects a ground load generating line through an interconnection circuit breaker, and a ground load generating line connects a grounding transformer through a ground transformer feeder circuit breaker, and a grounding resistor is connected to a grounding transformer.
Further: no. two high-voltage station transformer connects No. two underground load buses through No. two generating line inlet wire circuit breakers, and No. two underground load buses connect No. two ground load buses through No. two contact circuit breakers, and No. two ground load buses connect No. two ground transformer through No. two ground transformer feeder circuit breakers, and No. two ground resistor are connected to No. two ground transformer.
Further: the first underground load bus is connected with the underground safety bus through a first underground safety bus interconnection breaker.
Further: the second underground load bus is connected with the underground safety bus through a second underground safety bus connection breaker.
Further: no. two high-voltage station transformer connects No. two underground load buses through No. two generating line inlet wire circuit breakers, and No. two underground load buses connect No. two ground load buses through No. two contact circuit breakers, through the interconnection of underground load bus contact circuit breaker between an underground load bus and No. two underground load buses, through the interconnection of ground load bus contact circuit breaker between a ground load bus and No. two ground load buses.
The utility model provides a power station high pressure station service power multi-section bus system neutral point grounding structure which characterized in that: the high-voltage service transformer is correspondingly connected with two sections of underground load buses, the two sections of underground load buses are correspondingly connected with two sections of ground load buses, and the two sections of ground load buses are correspondingly connected with two grounding resistors.
Further: and the two sections of underground load buses are interconnected through an underground load bus interconnection breaker.
Further: the two sections of ground load buses are interconnected through a ground load bus interconnection breaker.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses set up the neutral point and connect the place in ground load generating line department, and through ground resistance ground connection, when high-voltage station power utilization multistage generating line system normally operated, if when single-phase earth fault takes place, can in time amputate the trouble, avoid the accident to further enlarge, ensure the power station operation safety;
2. the utility model can achieve the purpose that the neutral point of the whole system is grounded through a small resistor without arranging a neutral point grounding point at the underground load bus, thereby optimizing the system structure and reducing the equipment investment;
3. the utility model can be switched with the load bus, and the daily operation and maintenance of the power station are simple; and the utility model discloses the structure is clear simple, not only is applicable to the power station of newly-built, also is applicable to the power station transformation of having built equally.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The labels in the figures are: 1-a high-voltage service transformer; 2-a second high-voltage station service transformer; 3-bus incoming line breaker; 4-underground load bus; 5-second underground load bus; 6-underground safety bus; 7-a ground load bus; 8-second ground load bus; 10-tie breaker number one; 11-underground safety bus tie breaker; 12-underground load bus tie breakers; 13-tie breaker No. two; 14-second safety bus tie breaker; 15-a ground feeder breaker; 16-a grounding transformer; 17-ground resistance number one; 18-second ground feeder breaker; 19-second ground transformer; 20-second ground resistance; 21-ground load bus tie breaker; 22-bus two incoming circuit breaker.
Detailed Description
The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.
As shown in fig. 1, the utility model provides a pair of power station high pressure service power station multi-section bus system neutral point grounding structure, including high pressure service power station transformer and secret security bar, high pressure service power station transformer connects the underground load generating line, the interconnected ground load generating line of underground load generating line, ground load generating line connects ground resistance through earthing transformer, when the electrical system normally works, No. one high pressure service power station transformer 1 takes No. one underground load generating line 4 and No. one ground load generating line 7, No. one generating line inlet wire circuit breaker 3 and No. one contact circuit breaker 10 are in "closed" state, No. one underground security bar contact circuit breaker 11 and secret load generating line contact circuit breaker 12 are in "disconnected" state; no. two high voltage station transformer 2 takes No. two underground load buses 5 and No. two ground load buses 8, No. two bus inlet wire circuit breakers 22 and No. two tie circuit breakers 13 are in "closed" state, No. two safety bus tie circuit breakers 14 are in "open" state, No. one ground transformer feeder circuit breaker 15 and No. two ground transformer feeder circuit breakers 18 are in "closed" state, ground load bus tie circuit breaker 21 is in "open" state, No. one grounding transformer 16, No. one grounding resistor 17, No. two ground transformer 19, No. two ground 20 all put into working state. In this state, the entire power consumption system is a low-resistance grounding system.
The high-voltage service transformer comprises a first high-voltage service transformer 1 and a second high-voltage service transformer 2.
A high voltage power station transformer 1 connects an underground load bus 4 through a bus inlet wire circuit breaker 3, and an underground load bus 4 connects a ground load bus 7 through a contact circuit breaker 10, and a ground load bus 7 connects a grounding transformer 16 through a grounding transformer feeder circuit breaker 15, and a grounding resistor 17 is connected to a grounding transformer 16.
No. two high-voltage station transformer 2 connects No. two underground load buses 5 through No. two bus inlet wire circuit breakers 22, and No. two underground load buses 5 connect No. two ground load buses 8 through No. two tie circuit breakers 13, and No. two ground load buses 8 connect No. two ground transformer 19 through No. two ground transformer feeder circuit breakers 18, and No. two ground resistance 20 are connected to No. two ground transformer 19.
When the first high-voltage station service transformer 1 is in a fault state or needs to enter an overhaul state, the first bus incoming line breaker 3 is switched off, the underground load bus interconnection breaker 12 is switched on, the first interconnection breaker 10 is switched off, the ground load bus interconnection breaker 21 is switched on, the first grounding transformer feeder line breaker 15 is switched off, and the first grounding transformer 16 and the first grounding resistor 17 are switched off; in this working state, the second high-voltage service transformer 2 carries all the load buses underground and on the ground, and at this time, the whole system is a low-resistance grounding system. When the second high-voltage service transformer 2 is in fault or needs to enter the maintenance state, the same is true.
The first underground load bus 4 is connected with the underground safety bus 6 through a first underground safety bus interconnection breaker 11.
The second underground load bus 5 is connected with the underground safety bus 6 through a second underground safety bus interconnection breaker 14.
No. two high-voltage station transformer 2 connects No. two underground load buses 5 through No. two bus inlet wire circuit breakers 22, and No. two underground load buses 5 connect No. two ground load buses 8 through No. two contact breakers 13, through 12 interconnection of underground load bus contact breakers between a underground load bus 4 and No. two underground load buses 5, through 21 interconnection of ground load bus contact breakers between a ground load bus 7 and No. two ground load buses 8.
When the whole hydropower station loses high-voltage station power and needs to be put into an underground safety bus 6, a bus incoming line breaker 3, a bus incoming line breaker 22, an underground load bus interconnection breaker 12, a second interconnection breaker 13 and a second grounding transformer feeder breaker 18 are in an open state, a first interconnection breaker 10, a first underground safety bus interconnection breaker 11, a second safety bus interconnection breaker 14, a first grounding transformer feeder breaker 15 and a ground load bus interconnection breaker 21 are in a closed state, at the moment, a first grounding transformer 16 and a first grounding resistor 17 are put into a working state, a second grounding transformer 19 and a second grounding resistor 20 are out of operation, and the whole system is a low-resistance grounding system.
A neutral point grounding structure of a multi-section bus system for a high-voltage station power supply comprises two high-voltage station power supply transformers, wherein the two high-voltage station power supply transformers are correspondingly connected with two sections of underground load buses, the two sections of underground load buses are correspondingly connected with two sections of ground load buses, and the two sections of ground load buses are correspondingly connected with two grounding resistors.
The two sections of underground load buses are interconnected through an underground load bus interconnection breaker 12.
The two sections of ground load buses are interconnected through a ground load bus interconnection breaker 21.
The above embodiments are merely preferred technical solutions of the present invention, and it should be understood by those skilled in the art that modifications or substitutions of technical solutions or parameters in the embodiments can be made without departing from the principles and essential conditions of the present invention, and all the modifications or substitutions should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a power station high pressure station service power multi-section bus system neutral point grounding structure which characterized in that: the high-voltage service transformer is connected with an underground load bus, the underground load bus is interconnected with a ground load bus, and the ground load bus is connected with a grounding resistor through a grounding transformer.
2. The neutral point grounding structure of the multi-section bus system for the high-voltage power station according to claim 1, characterized in that: the high-voltage service transformer comprises a first high-voltage service transformer and a second high-voltage service transformer.
3. The neutral point grounding structure of the multi-section bus system for the high-voltage power station according to claim 2, characterized in that: a high voltage power station transformer connects an underground load generating line through a generating line inlet wire circuit breaker, and an underground load generating line connects a ground load generating line through an interconnection circuit breaker, and a ground load generating line connects a grounding transformer through a ground transformer feeder circuit breaker, and a grounding resistor is connected to a grounding transformer.
4. The neutral point grounding structure of the multi-section bus system for the high-voltage power station according to claim 2, characterized in that: no. two high-voltage station transformer connects No. two underground load buses through No. two generating line inlet wire circuit breakers, and No. two underground load buses connect No. two ground load buses through No. two contact circuit breakers, and No. two ground load buses connect No. two ground transformer through No. two ground transformer feeder circuit breakers, and No. two ground resistor are connected to No. two ground transformer.
5. The neutral point grounding structure of the multi-section bus system for the high-voltage power station according to claim 3, wherein: the first underground load bus is connected with the underground safety bus through a first underground safety bus interconnection breaker.
6. The neutral point grounding structure of the multi-section bus system for the high-voltage power station according to claim 4, wherein: the second underground load bus is connected with the underground safety bus through a second underground safety bus connection breaker.
7. The neutral point grounding structure of the multi-section bus system for the high-voltage power station according to claim 3, wherein: no. two high-voltage station transformer connects No. two underground load buses through No. two generating line inlet wire circuit breakers, and No. two underground load buses connect No. two ground load buses through No. two contact circuit breakers, through the interconnection of underground load bus contact circuit breaker between an underground load bus and No. two underground load buses, through the interconnection of ground load bus contact circuit breaker between a ground load bus and No. two ground load buses.
8. The utility model provides a power station high pressure station service power multi-section bus system neutral point grounding structure which characterized in that: the high-voltage service transformer is correspondingly connected with two sections of underground load buses, the two sections of underground load buses are correspondingly connected with two sections of ground load buses, and the two sections of ground load buses are correspondingly connected with two grounding resistors.
9. The neutral point grounding structure of the multi-section bus system for the high-voltage power station according to claim 8, wherein: and the two sections of underground load buses are interconnected through an underground load bus interconnection breaker.
10. The neutral point grounding structure of the multi-section bus system for the high-voltage power station according to claim 8, wherein: the two sections of ground load buses are interconnected through a ground load bus interconnection breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021205304.9U CN212518389U (en) | 2020-06-24 | 2020-06-24 | Neutral point grounding structure of multi-section bus system for high-voltage station power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021205304.9U CN212518389U (en) | 2020-06-24 | 2020-06-24 | Neutral point grounding structure of multi-section bus system for high-voltage station power station |
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| Publication Number | Publication Date |
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| CN212518389U true CN212518389U (en) | 2021-02-09 |
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| CN202021205304.9U Active CN212518389U (en) | 2020-06-24 | 2020-06-24 | Neutral point grounding structure of multi-section bus system for high-voltage station power station |
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| CN (1) | CN212518389U (en) |
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- 2020-06-24 CN CN202021205304.9U patent/CN212518389U/en active Active
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