CN211790004U - Power plant service grounding structure containing diesel generator - Google Patents
Power plant service grounding structure containing diesel generator Download PDFInfo
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- CN211790004U CN211790004U CN202020255544.3U CN202020255544U CN211790004U CN 211790004 U CN211790004 U CN 211790004U CN 202020255544 U CN202020255544 U CN 202020255544U CN 211790004 U CN211790004 U CN 211790004U
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Abstract
The utility model provides a power plant service grounding structure containing a diesel generator, which comprises a service transformer, a diesel generator set and a low-voltage power distribution cabinet; the low-voltage power distribution cabinet comprises a section I bus, a section II bus, a neutral line, a protection line and a three-phase circuit breaker. When the low-voltage distribution outgoing line has asymmetric short circuit fault, the fault current almost completely flows through the neutral line, the zero sequence current detection accuracy is high during fault, and the ground protection is convenient to cooperate; in addition, the fault current flowing through the transformer shell and the diesel generator shell is small, and the influence on a control element on the shell is small.
Description
Technical Field
The utility model relates to a distribution field especially relates to a power plant service grounding structure who contains diesel generator.
Background
Diesel generators are often used as backup power sources for power plants as independent reliable power sources. In order to ensure that the asymmetrical fault of the low-voltage distribution outgoing line loop is cut off, grounding protection is required to be configured. In the past, the interphase short-circuit protection or the three-phase short-circuit protection is usually adopted to replace the ground protection in the power distribution system, however, the power distribution system of the modern power plant is more and more complex, the interphase short-circuit protection or the three-phase short-circuit protection cannot replace the ground protection due to the long low-voltage distribution outlet line of some loops, or the sensitivity is low, the requirement of the protection specification is not met, the independent ground protection needs to be configured, and the premise of the ground protection is that the zero-sequence current needs to be. In addition, as the short-circuit current of the low-voltage distribution system is larger and larger, the induced current appearing on the shell of the transformer and the diesel generator can not be ignored.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a power plant service grounding structure who contains diesel generator. The utility model adopts the following technical scheme.
A power plant service grounding structure containing a diesel generator is characterized by comprising a service transformer, a diesel generator set and a low-voltage power distribution cabinet; the low-voltage power distribution cabinet comprises a section I bus, a section II bus, a neutral line, a protection line and a three-phase circuit breaker; the low-voltage side phase conductor of the station transformer is connected with the I section bus of the low-voltage power distribution cabinet through a three-phase circuit breaker; the low-voltage neutral point of the station transformer is connected with a neutral line of the low-voltage power distribution cabinet through a copper bar; the house transformer shell is connected with a low-voltage power distribution cabinet protection line through a copper bar; the phase conductor of the diesel generator set is connected with a section II bus of the low-voltage power distribution cabinet through a three-phase circuit breaker; the neutral point of the diesel generator set is connected with a neutral line of the low-voltage power distribution cabinet through a copper bar; the shell of the diesel generating set is connected with a protection line of the low-voltage power distribution cabinet through a copper bar; the I section bus and the II section bus of the low-voltage power distribution cabinet are connected through a three-phase circuit breaker; and the low-voltage power distribution cabinet shell is connected with a low-voltage power distribution cabinet protection line.
Furthermore, the neutral line of the low-voltage power distribution cabinet is connected with the protection line at only one point.
Furthermore, the low-voltage power distribution cabinet protection line and the plant grounding grid are provided with more than two connection points.
Furthermore, the materials of the neutral line and the protective line of the low-voltage power distribution cabinet are copper bars.
Furthermore, the neutral line of the low-voltage power distribution cabinet is connected with the protection line at only one point; the low-voltage power distribution cabinet protection line and the plant grounding grid are provided with two or more than two multiple connection points.
The utility model has the advantages that:
1. when the low-voltage distribution outgoing line has an asymmetric short-circuit fault, the fault current almost completely flows through the neutral line, the zero-sequence current detection accuracy is high during the fault, and the ground protection is convenient to match;
2. when the low-voltage distribution outgoing line has an asymmetric short-circuit fault, the fault current flowing through the transformer shell and the diesel generator shell is very small, and the influence on a control element on the shell is small.
Drawings
Fig. 1 is an electrical schematic diagram of an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Reference is made to the accompanying drawings. The utility model discloses a power plant's station service power grounding structure who contains diesel generator, transformer 1, diesel generating set 2, low-voltage distribution cabinet 3 are used in the station service. The low-voltage power distribution cabinet comprises a section I bus 3.1, a section II bus 3.2, a neutral line 3.3, a protection line 3.4 and a plurality of three-phase circuit breakers. The low-voltage side phase conductor of the station transformer 1 is connected with a section I bus 3.1 of the low-voltage power distribution cabinet through a three-phase circuit breaker 3.51; the low-voltage neutral point of the station transformer 1 is connected with a neutral line 3.3 of a low-voltage power distribution cabinet through a copper bar; the shell of the station transformer 1 is connected with a low-voltage power distribution cabinet protection line 3.4 through a copper bar; the phase conductor of the diesel generator set 2 is connected with a bus 3.2 at the section II of the low-voltage power distribution cabinet through a three-phase circuit breaker 3.52; the neutral point of the diesel generator set 2 is connected with a neutral line 3.3 of the low-voltage power distribution cabinet through a copper bar; the shell of the diesel generator set 2 is connected with a low-voltage power distribution cabinet protection line 3.4 through a copper bar; the I section bus 3.1 and the II section bus 3.2 of the low-voltage power distribution cabinet are connected through a three-phase circuit breaker 3.53; and the shell of the low-voltage power distribution cabinet 3 is connected with a low-voltage power distribution cabinet protection wire 3.4.
The neutral line 3.3 of the low-voltage distribution cabinet is connected with the protective line 3.4 only at one point.
The low-voltage power distribution cabinet protection line 3.4 and a plant grounding grid are provided with two connection points.
The materials of the neutral wire and the protective wire of the low-voltage power distribution cabinet are-40 x4 copper bars.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, i.e. all equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention, which is not illustrated herein.
Claims (5)
1. A power plant service grounding structure containing a diesel generator is characterized by comprising a service transformer, a diesel generator set and a low-voltage power distribution cabinet; the low-voltage power distribution cabinet comprises a section I bus, a section II bus, a neutral line, a protection line and a plurality of three-phase circuit breakers; the low-voltage side phase conductor of the station transformer is connected with the I section bus of the low-voltage power distribution cabinet through a three-phase circuit breaker; the low-voltage neutral point of the station transformer is connected with a neutral line of the low-voltage power distribution cabinet through a copper bar; the house transformer shell is connected with a low-voltage power distribution cabinet protection line through a copper bar; the phase conductor of the diesel generator set is connected with a section II bus of the low-voltage power distribution cabinet through a three-phase circuit breaker; the neutral point of the diesel generator set is connected with a neutral line of the low-voltage power distribution cabinet through a copper bar; the shell of the diesel generating set is connected with a protection line of the low-voltage power distribution cabinet through a copper bar; the I section bus and the II section bus of the low-voltage power distribution cabinet are connected through a three-phase circuit breaker; and the low-voltage power distribution cabinet shell is connected with a low-voltage power distribution cabinet protection line.
2. The grounding structure for service power of power plant including diesel generator as claimed in claim 1, wherein said neutral line of low voltage distribution cabinet is connected to said protection line at only one point.
3. The grounding structure for industrial power plants including diesel generators of claim 1, wherein said protection wires of low voltage distribution cabinets have two or more than two multiple connection points with the grounding grid of industrial power plants.
4. The grounding structure for service power of power plant including diesel generator according to claim 1, wherein the neutral wire and the protection wire of said low voltage distribution cabinet are made of copper bars.
5. The grounding structure for service power of power plant including diesel generator according to claim 1, wherein said neutral line of low voltage distribution cabinet is connected to said protection line at only one point; the low-voltage power distribution cabinet protection line and the plant grounding grid are provided with two or more than two multiple connection points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020255544.3U CN211790004U (en) | 2020-03-04 | 2020-03-04 | Power plant service grounding structure containing diesel generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020255544.3U CN211790004U (en) | 2020-03-04 | 2020-03-04 | Power plant service grounding structure containing diesel generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211790004U true CN211790004U (en) | 2020-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020255544.3U Active CN211790004U (en) | 2020-03-04 | 2020-03-04 | Power plant service grounding structure containing diesel generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211790004U (en) |
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2020
- 2020-03-04 CN CN202020255544.3U patent/CN211790004U/en active Active
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