CN218633442U - Auxiliary transformer dual-power switching system in photovoltaic box transformer substation - Google Patents
Auxiliary transformer dual-power switching system in photovoltaic box transformer substation Download PDFInfo
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- CN218633442U CN218633442U CN202223164468.3U CN202223164468U CN218633442U CN 218633442 U CN218633442 U CN 218633442U CN 202223164468 U CN202223164468 U CN 202223164468U CN 218633442 U CN218633442 U CN 218633442U
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- transformer
- auxiliary
- cubical switchboard
- switch
- main switch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model provides an auxiliary transformer dual power supply switching system in photovoltaic case becomes, its characterized in that: including cubical switchboard, middling pressure transformer, middling pressure looped netowrk, block terminal, the cubical switchboard includes cubical switchboard A and cubical switchboard B, is connected with two low pressure sides of middling pressure transformer respectively in cubical switchboard A and the cubical switchboard B, and two low pressure sides of middling pressure transformer still are connected with the ATS switch, and the ATS switch is connected with supplementary distribution transformer, and supplementary distribution transformer is connected with the block terminal, and the high pressure side of middling pressure transformer is connected with the middling pressure looped netowrk. The utility model discloses a with two split winding low pressure sides that supplementary variable power source got to two split transformers respectively, when a branch road electrical fault, the ATS switch can accomplish supplementary power supply line switching in 0-1.5s, guarantees box transformer steady operation.
Description
Technical Field
The utility model relates to an auxiliary transformer dual power supply switching system in photovoltaic case becomes.
Background
After the solar cell converts light energy into direct current electric energy, the direct current is converted into alternating current through the photovoltaic inverter, and the alternating current is boosted through the box-type transformer and then is transmitted to a power grid.
The box-type transformer is used as a control device in the power supply process, the transformer, the medium-voltage switch equipment and the low-voltage switch equipment are integrated together, an auxiliary transformer is arranged in the box-type transformer and used as the box-type transformer to provide power for the internal switch, the signal equipment and the illumination, the conventional auxiliary transformer is only connected with one power supply line, when the line fails, the equipment signal and the internal switch are stopped, and the power supply safety is difficult to guarantee. In order to ensure the reliability of a box-type transformer, for example, an intelligent railway signal box-type transformer substation disclosed in publication number CN2593418Y has 2 independent power supplies belonging to different power grid systems, each power supply is connected to the inlet end of the transformer through a high-voltage load switch and a high-voltage fuse tube with follow-up auxiliary nodes, the outlet end of a branch switch in a two-circuit is connected to the inlet end of a duplex automatic transfer switch, and the outlet ends of the two automatic transfer switches are connected and used as an off-station operating power supply and a power supply of self-powered equipment of a local station through switches. However, the incoming line ends of the duplex automatic transfer switch are respectively connected to the two loops, and since the switches are also installed in the two loops to control the two loops, the switches in the loops can only use common switches, and if an electromagnetic intelligent switch is used, a long time delay is generated after the duplex automatic transfer switch is switched, which is not beneficial to realizing the automatic control of the circuit by using the intelligent switch.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an auxiliary transformer dual power switching system in photovoltaic case becomes.
The utility model discloses a following technical scheme can realize.
The utility model provides a double power supply switching system of an auxiliary transformer in a photovoltaic box transformer substation; including cubical switchboard, middling pressure transformer, middling pressure looped netowrk, block terminal, the cubical switchboard includes cubical switchboard A and cubical switchboard B, is connected with two low pressure sides of middling pressure transformer respectively in cubical switchboard A and the cubical switchboard B, and two low pressure sides of middling pressure transformer still are connected with the ATS switch, and the ATS switch is connected with supplementary distribution transformer, and supplementary distribution transformer is connected with the block terminal, and the high pressure side of middling pressure transformer is connected with the middling pressure looped netowrk.
The switch cabinet A and the switch cabinet B are internally provided with a main switch QFA and a main switch QFB respectively, one sides of the main switch QFA and the main switch QFB are converged into a plurality of branch switches, and the other sides of the main switch QFA and the main switch QFB are connected with the low-voltage side of the medium-voltage transformer.
The front stages of the main switch QFA and the main switch QFB are also respectively connected with a lightning protection device.
The distribution box is connected with the auxiliary distribution transformer through a main switch QF1, and the other side of the main switch QF1 is connected with a plurality of micro switches respectively.
The main switch QF1 is also connected with a lightning protection device.
And the switch cabinet A, the switch cabinet B and the auxiliary distribution transformer are all provided with power meters, and the power meters are connected with the PLC through communication boxes.
The PLC is supplied with power through an external auxiliary distribution transformer.
The beneficial effects of the utility model reside in that: by respectively arranging the auxiliary variable power supply on the low-voltage sides of the two split windings of the double-split transformer, when one branch circuit has an electrical fault, the ATS switch can complete the switching of an auxiliary power supply circuit within 0-1.5s, and the stable operation of the box-type transformer is ensured.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, the branch switches QFB1 to QFBn in the switch cabinet a are respectively connected to one of the solar cells, and then converge to the low-voltage side of one of the medium-voltage transformers through the main switch QFB, the branch switches QFA1 to QFAn in the switch cabinet a are respectively connected to one of the solar cells, and then converge to the low-voltage side of the other medium-voltage transformer through the main switch QFA, and one of the lines is respectively led out from the two low-voltage sides of the medium-voltage transformer T1 and connected to the auxiliary distribution transformer T2 through the AST switch, and when a low-voltage split winding of the double-voltage transformer (medium-voltage transformer) fails or is powered off, the dual-power supply device is automatically switched to the other power supply through the auxiliary distribution transformer T2, so as to ensure the stability of the auxiliary transformer power supply and the stable operation of the box transformer. The high-voltage side of the medium-voltage transformer T1 is connected with a medium-voltage ring network.
When a fault or maintenance occurs, one path of ATS switch of the dual-power switch can be switched off, and the other path of ATS supplies power, so that the safety of maintenance personnel is ensured; and after the maintenance and the overhaul are finished, switching the ATS switch to another path for operation, and operating again.
In order to monitor the operation condition of a power supply line, power meters are respectively arranged in the switch cabinet A and the switch cabinet B at the rear stage of a main switch QFB and used for detecting the current generated by the solar cells controlled by the two switch cabinets, and the power meters are connected with a communication box and then generate power to a PLC.
The rear electrodes of main switches QFA, QFB and QF1 in the switch cabinet A, the switch cabinet B and the power distribution cabinet are respectively connected with lightning protection devices SDP1, SPD2 and SPD3 and are grounded.
Claims (7)
1. The utility model provides an auxiliary transformer dual power switching system in photovoltaic case becomes which characterized in that: including cubical switchboard, middling pressure transformer, middling pressure looped netowrk, block terminal, the cubical switchboard includes cubical switchboard A and cubical switchboard B, is connected with two low pressure sides of middling pressure transformer in cubical switchboard A and the cubical switchboard B respectively, and two low pressure sides of middling pressure transformer still are connected with the ATS switch, and the ATS switch is connected with supplementary distribution transformer, and supplementary distribution transformer is connected with the block terminal, and the high pressure side of middling pressure transformer is connected with the middling pressure looped netowrk.
2. The double power switching system of the auxiliary transformer in the photovoltaic box transformer substation of claim 1, characterized in that: the switch cabinet A and the switch cabinet B are internally provided with a main switch QFA and a main switch QFB respectively, one sides of the main switch QFA and the main switch QFB are converged into a plurality of branch switches, and the other sides of the main switch QFA and the main switch QFB are connected with the low-voltage side of the medium-voltage transformer.
3. The double power switching system of the auxiliary transformer in the photovoltaic box transformer substation of claim 2, characterized in that: the front stages of the main switch QFA and the main switch QFB are also respectively connected with a lightning protection device.
4. The double power switching system of the auxiliary transformer in the photovoltaic box transformer substation of claim 1, characterized in that: the distribution box is connected with the auxiliary distribution transformer through a main switch QF1, and the other side of the main switch QF1 is connected with a plurality of micro switches respectively.
5. The double-power-supply switching system of the auxiliary transformer in the photovoltaic box transformer substation of claim 4, characterized in that: the main switch QF1 is also connected with a lightning protection device.
6. The double power switching system of the auxiliary transformer in the photovoltaic box transformer substation of claim 1, characterized in that: and the switch cabinet A, the switch cabinet B and the auxiliary distribution transformer are all provided with power meters, and the power meters are connected with the PLC through communication boxes.
7. The double power switching system of the auxiliary transformer in the photovoltaic box transformer substation of claim 6, wherein: the PLC is supplied with power through an external auxiliary distribution transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223164468.3U CN218633442U (en) | 2022-11-28 | 2022-11-28 | Auxiliary transformer dual-power switching system in photovoltaic box transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223164468.3U CN218633442U (en) | 2022-11-28 | 2022-11-28 | Auxiliary transformer dual-power switching system in photovoltaic box transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218633442U true CN218633442U (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223164468.3U Active CN218633442U (en) | 2022-11-28 | 2022-11-28 | Auxiliary transformer dual-power switching system in photovoltaic box transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218633442U (en) |
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2022
- 2022-11-28 CN CN202223164468.3U patent/CN218633442U/en active Active
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