CN218352256U - Power standby power supply circuit for extra-high voltage converter station - Google Patents
Power standby power supply circuit for extra-high voltage converter station Download PDFInfo
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- CN218352256U CN218352256U CN202222303536.3U CN202222303536U CN218352256U CN 218352256 U CN218352256 U CN 218352256U CN 202222303536 U CN202222303536 U CN 202222303536U CN 218352256 U CN218352256 U CN 218352256U
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Abstract
The utility model relates to an extra-high voltage power supply spare circuit for convertor station, including convertor station and transformer substation, be connected with the outer power supply circuit that draws of 10kV in double circuit between convertor station and the transformer substation, be connected with convertor station for station power supply spare A and 10kV power A on the outer power supply circuit that draws of 10kV on one circuit, be connected with convertor station for station power supply spare B and 10kV power B on another circuit. The standby power supply for the converter station on the double-loop 10kV external power supply path is not needed to be changed, when one main transformer of a 220kV transformer substation breaks down or is overhauled and shut down, the power supply can be switched to another main transformer, the reliability is higher than that of the single-loop 10kV scheme, the two-loop 10kV external power supply is simultaneously connected to the standby section bus of the 10kV station power supply, and the two-loop external power supply is switched between the two-loop external power supply.
Description
Technical Field
The utility model belongs to the technical field of special high voltage convertor station power consumption technique and specifically relates to a special high voltage convertor station power consumption stand-by power supply circuit.
Background
According to the regulations of a standby power system in national standard 'design specification of +/-800 kV direct current converter station' GB50789-2012 and power industry standard 'specification of power utilization design technology of converter station' DL/T5460-2012, the power utilization design of the converter station at present follows the following principle: the station power supply is suitable to be arranged according to three loops of relatively independent power supplies and comprises two paths of working power supplies and one path of standby power supply, if a 500kV alternating-current switch field is arranged in the converter station, the network side of the converter transformer is connected into a 500kV system, and 2 sets of voltage reduction transformers for the 500kV station are connected into a 500kV power distribution device through circuit breakers. 2 working transformers are arranged in the station and are connected to the low-voltage side of the 500kV voltage reduction transformer as working power supplies, and one power supply outside the station is led out to be used as a standby power supply of the converter station.
The standby power supply is led from the outside of the station to ensure the reliability and the independence of the power supply. The voltage grade of the external power supply is not lower than 35kV. According to power grid planning, in the later stage, in order to meet the requirements of hydropower delivery in the southwest, extra-high voltage converter stations are planned to be built in the regions so as to meet the requirements of hydropower delivery. And the power grid structure in these areas is weak, and the reliability is poor. The whole grid frame of the power grid is in a radial shape, the phenomena of single line, single change and series supply are common, and load transfer cannot be carried out in time when a line is overhauled or broken, so that the power supply reliability is not high; in addition, direct electrical connection does not exist between the district power grids, and the district power grids cannot provide electric power support when in fault, so that power supply safety is ensured; the distribution network has a long power supply distance and most stations do not have reactive compensation equipment; once entering into the dry season, along with load increase, local water electric output reduces, and current reactive power compensation equipment can not satisfy county power grid reactive demand, leads to the electric wire netting terminal voltage to hang down, seriously influences the power supply quality.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a special high voltage current conversion station power consumption stand-by power supply circuit is provided, through in the construction at power station 220kV transformer substation (this transformer substation is permanent transformer substation, and the 220kV side links to each other with big electric wire netting), respectively draw from different main changes and connect 1 time 10kV circuit as current conversion station power consumption stand-by power supply.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides an extra-high voltage converter station power consumption standby power supply circuit, includes converter station and transformer substation, be connected with the 10kV of two return circuits between converter station and the transformer substation and draw the power line outward, be connected with converter station power consumption A and 10kV power A for the converter station on one return circuit on the 10kV draws the power line outward, be connected with converter station power consumption B and 10kV power B for the converter station on another return circuit.
The 10kV external lead power line has a section of 240mm 2 The overhead insulated conductor of (1).
The transformer substation is a 220KV transformer substation.
Outgoing lines of the standby power supply A for the converter station and outgoing lines of the standby power supply B for the converter station adopt copper core cables with 2 x 400mm2 sections.
Outgoing lines of a 10kV power supply A and a 10kV power supply B on the 220kV transformer substation are both 2 x 400mm 2-section copper core cables. .
The utility model has the advantages that:
1. the standby power supply for the converter station on the double-loop 10kV external power supply path is not needed to be changed, when one main transformer of a 220kV transformer substation breaks down or is overhauled and shut down, the power supply can be switched to another main transformer, the reliability is higher than that of the single-loop 10kV scheme, the two-loop 10kV external power supply is simultaneously connected to the standby section bus of the 10kV station power supply, and the two-loop external power supply is switched between the two-loop external power supply.
2. The continuous ultimate transmission capacity of the overhead insulated conductor with the section of 240mm < 2 > under the voltage level of 10kV is about 8.66MVA under the conditions that the ambient temperature is 40 ℃ and the working temperature is 90 ℃; section 240mm 2 The continuous limit conveying capacity of the steel-cored aluminum strand is about 9.56MVA when the steel-cored aluminum strand is designed at 80 ℃ under the voltage level of 10kV, and each loop of the off-station power supply adopts two 240mm 2 The wire can satisfy station with load power consumption demand.
Drawings
Fig. 1 is a schematic diagram of a standby power supply for power utilization in a converter station according to the present invention;
FIG. 2 is the electrical main wiring diagram of the 220kV transformer substation of the present invention;
fig. 3 is a wiring diagram for standby power of the converter station of the present invention;
shown in the figure: 1-a converter station; 2-a transformer substation; 3-10kV external power supply path; 4-standby electricity A for the convertor station; 5-standby electricity B for the converter station; 6-10kV power supply A;7-10kV power supply B.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 to 3, the standby power supply line for the extra-high voltage converter station includes a converter station 1 and a transformer substation 2, a double-loop 10kV external lead power supply line 3 is connected between the converter station 1 and the transformer substation 2, a loop on the 10kV external lead power supply line 3 is connected with a converter station standby power supply A4 and a 10kV power supply A6, and another loop is connected with a converter station standby power supply B5 and a 10kV power supply B7.
The 10kV external leading power line 3 has a section of 240mm 2 The overhead insulated conductor of (1).
The substation 2 is a 220kv substation.
Outgoing lines of the standby power A4 for the converter station and outgoing lines of the standby power B5 for the converter station adopt copper core cables with the cross sections of 2 x 400mm & lt 2 & gt.
Outgoing lines of a 10kV power supply A6 and a 10kV power supply B7 of the 220kV transformer substation are both 2 x 400mm 2-section copper core cables.
Through a 240mm2 overhead insulated conductor, the continuous limit transmission capacity of the overhead insulated conductor with the section of 240mm2 under the voltage level of 10kV is about 8.66MVA under the conditions that the ambient temperature is 40 ℃ and the working temperature is 90 ℃; section 240mm 2 The continuous limit conveying capacity of the steel-cored aluminum strand is about 9.56MVA when the steel-cored aluminum strand is designed at 80 ℃ under the voltage level of 10kV, and each loop of the off-station power supply adopts two 240mm 2 The wire can satisfy station load power consumption demand.
A. Leading scheme
In a 220kV transformer substation 2 for construction of a hydropower station, a 10kV external power supply path 3 is led from different main transformers and is used as a standby power supply for power supply of a current conversion station connected with 1, the reliability of power supply of the lead 2 loop is high, the power failure influence of the 10kV scheme is small, the implementation is easy, the 10kV scheme can be used as a construction power supply, the economy is better, and 4% of the line voltage drop of the 10kV scheme meets the requirement of +/-7% of allowable voltage loss of GB12325-2008 power quality supply voltage allowable deviation.
If a single-circuit 10kV scheme is adopted, an off-station power supply obtains electricity from a #2 main transformer of a 220kV transformer substation recently, and needs to be connected to a #1 main transformer in a long term due to transformer load; the double-circuit 10kV scheme does not need to be changed, when one main transformer of 2 transformer substations of 220kV breaks down or is overhauled and shut down, the double-circuit 10kV scheme can be switched to another main transformer to get electricity, the reliability is higher than the single-circuit 10kV scheme, a double-circuit 10kV power supply A6 and a 10kV power supply B7 are simultaneously connected to a standby section bus of standby power supply A4 for the converter station and a standby power supply B5 for the converter station, and a standby automatic switching device is adopted to switch between power supplies outside the double-circuit substation, so that the switching is easy to realize.
The line is a spare line of the electric standby power supply of the converter station, and the annual use hours are considered to be less than 3000 hours. The standby electric load is about 12.5MVA, the economic current density is 1.65, the insulating wire is selected to improve the reliability of the power supply outside the station, and the section of the insulating wire of the 10kV line can be 440mm & lt 2 & gt according to the economic current density.
B. Selecting conductor cross-section according to conductor continuous limit conveying
Under the conditions that the ambient temperature is 40 ℃ and the working temperature is 90 ℃, the continuous limit transmission capacity of the overhead insulated conductor with the section of 240mm & lt 2 & gt is about 8.66MVA under the voltage level of 10 kV; the steel-cored aluminum strand having a cross-section of 240mm2 has a maximum capacity of about 9.56MVA when it is designed at 80 ℃ at a voltage level of 10 kV. And each loop of the power supply outside the station adopts two 240mm & lt 2 & gt conducting wires, so that the power demand of the load for the station can be met.
C. Recommended wire cross section
And (4) combining the analysis results, recommending a newly-built double-circuit 10kV line by combining the condition of general equipment of the 10kV line and the existing 10kV line model of the power grid, and vertically erecting two wires with the cross section of 240mm & lt 2 & gt in each circuit.
D. Cable section selection
The standby electrical load is about 12.5MVA, the calculated long-term allowable current-carrying capacity is more than or equal to 722A, the reference current-carrying capacity of the three-core 400mm 2-section copper-core cable is about 482.46A under the conditions that the soil temperature is 25 ℃ and the soil thermal resistance coefficient is 2.0 Km/W, and the current-carrying capacity of 4 400mm 2-section copper-core cables is about 482.46 multiplied by 0.84=405.27A when the cables are laid side by side at 200mm intervals, so that the 2 multiplied by 400mm 2-section copper-core cables can meet the requirements.
E. Construction power supply selection
The construction power supply capacity requirement is about 2MVA, and the construction power supply and the off-station standby power supply are considered in a temporary permanent combination mode, and the off-station power supply needs to be built in advance to meet the construction requirement.
F. 10kV power switching
And the two-circuit 10kV out-station power supply A and the two-circuit 10kV out-station power supply B are simultaneously connected into the 10kV standby section buses of the power utilization standby power supply A and the system B of the converter station, and the two-circuit out-station power supply is switched by adopting a standby power automatic switching device.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and for those skilled in the art, the present invention can be modified and changed in various ways, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides an extra-high voltage convertor station power consumption stand-by power supply line, includes convertor station (1) and transformer substation (2), its characterized in that: a10 kV external lead power circuit (3) with double loops is connected between the converter station (1) and the transformer substation (2), one loop of the 10kV external lead power circuit (3) is connected with standby power A (4) and a 10kV power A (6) for the converter station, and the other loop of the 10kV external lead power circuit is connected with standby power B (5) and a 10kV power B (7) for the converter station.
2. The electric equipment for extra-high voltage converter station of claim 1With power supply circuit, its characterized in that: the 10kV external power supply line (3) adopts a section of 240mm 2 The overhead insulated conductor of (1).
3. The extra-high voltage converter station power backup power supply line of claim 1, characterized in that: the transformer substation (2) is a 220KV transformer substation.
4. The extra-high voltage converter station power backup power supply line of claim 1, characterized in that: outgoing lines of the standby power A (4) for the converter station and outgoing lines of the standby power B (5) for the converter station are both copper core cables with 2 x 400mm2 sections.
5. The electric standby power line for the extra-high voltage converter station of claim 3, characterized in that: outgoing lines of a 10kV power supply A (6) and a 10kV power supply B (7) on the 220kV transformer substation are both made of copper core cables with 2 x 400mm2 sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222303536.3U CN218352256U (en) | 2022-08-30 | 2022-08-30 | Power standby power supply circuit for extra-high voltage converter station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222303536.3U CN218352256U (en) | 2022-08-30 | 2022-08-30 | Power standby power supply circuit for extra-high voltage converter station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218352256U true CN218352256U (en) | 2023-01-20 |
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| CN202222303536.3U Active CN218352256U (en) | 2022-08-30 | 2022-08-30 | Power standby power supply circuit for extra-high voltage converter station |
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2022
- 2022-08-30 CN CN202222303536.3U patent/CN218352256U/en active Active
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