CN220401457U - Portable DC power supply device for transformer substation - Google Patents
Portable DC power supply device for transformer substation Download PDFInfo
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- CN220401457U CN220401457U CN202321827858.6U CN202321827858U CN220401457U CN 220401457 U CN220401457 U CN 220401457U CN 202321827858 U CN202321827858 U CN 202321827858U CN 220401457 U CN220401457 U CN 220401457U
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- 238000001514 detection method Methods 0.000 claims abstract description 48
- 238000009413 insulation Methods 0.000 claims abstract description 30
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 description 5
- 101001007417 Homo sapiens LEM domain-containing protein 2 Proteins 0.000 description 2
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- 101100028967 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) PDR5 gene Proteins 0.000 description 1
- 229910002796 Si–Al Inorganic materials 0.000 description 1
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Abstract
The utility model belongs to the technical field of power supply, and particularly relates to a portable direct-current power supply device of a transformer substation, which comprises a VIENNA rectifier, wherein the input end of the VIENNA rectifier is connected with three-phase alternating current, the output end of the VIENNA rectifier is connected with voltage busbar +HM and-M, the output end of the VIENNA rectifier is also connected with a storage battery through a charging and discharging circuit, and a voltage detection unit and a battery current detection unit are respectively used for detecting the voltage and charging and discharging current of the storage battery; the output end of the VIENNA rectifier is also connected with the voltage busbar +KM and-M through a Buck converter, the first insulation detection unit is connected between the voltage busbar +HM and-M, and the second insulation detection unit is connected between the voltage busbar +KM and-M; the input end of the storage battery management unit is connected with the voltage detection unit, the battery current detection unit, the first insulation detection unit and the second insulation detection unit, and the output end of the storage battery management unit is connected with the storage battery charging and discharging circuit and the Buck converter. The utility model has simple structure and high safety.
Description
Technical Field
The utility model belongs to the technical field of power supply, and particularly relates to a portable direct-current power supply device of a transformer substation.
Background
The informatization and modernization of the social development continuously improve the reliability requirements of the power supply system, and in order to ensure the power supply reliability, the transformer substations of various voltage classes often need to start a standby direct current system or a standby battery pack to serve as an emergency power supply. The traditional emergency backup storage battery pack has the defects of complex operation, long time and slow emergency speed in the transportation, installation and disassembly processes, and seriously affects the accident handling efficiency. And in the process of installation and disassembly, risks such as short circuit of the storage battery are extremely easy to occur. For power equipment maintenance personnel, the storage battery maintenance of the direct current system always has a great potential safety hazard.
The direct current system of the transformer substation with the voltage class of 110kV and below in China is generally composed of a group of storage batteries and a charger. The transformer substation with the voltage level above 220kV is generally in a 'two-electricity three-charging' mode, namely a direct current system consists of two groups of storage batteries and three chargers. The three-phase alternating voltage is connected to a rectification power supply and then output as direct current, and the direct current is distributed to all devices in the station by a branch feeder system to supply power. The direct current system of the transformer substation is usually integrated in a fixed direct current feed screen, when the direct current system of the transformer substation is normally operated and maintained, technically transformed and subjected to accident treatment, a certain overhaul time is needed, and the normal power supply of secondary equipment in the transformer substation is influenced, so that a portable mobile power supply with high safety and reliability is needed to replace the fault direct current system to reliably supply power to the secondary equipment in the transformer substation, thereby reducing the risk of operation and maintenance and improving the reliability of power grid operation.
Disclosure of Invention
The utility model overcomes the defects existing in the prior art, and solves the technical problems that: the portable direct-current power supply device of the transformer substation is simple in structure and high in safety.
In order to solve the technical problems, the utility model adopts the following technical scheme: a portable direct current power supply device of a transformer substation comprises a VIENNA rectifier, a storage battery charging and discharging circuit, a Buck converter, a management unit, a battery voltage detection unit, a battery current detection unit, a first insulation detection unit and a second insulation detection unit;
the input end of the VIENNA rectifier is connected with the three-phase alternating current, the output end of the VIENNA rectifier is connected with a voltage busbar +HM and-M, the output end of the VIENNA rectifier is also connected with the storage battery through the charging and discharging circuit, and the voltage detection unit and the battery current detection unit are respectively used for detecting the voltage and the charging and discharging current of the storage battery; the output end of the VIENNA rectifier is also connected with a voltage busbar +KM and a voltage busbar-M through a Buck converter, the first insulation detection unit is connected between the voltage busbar +HM and the voltage busbar-M, and the second insulation detection unit is connected between the voltage busbar +KM and the voltage busbar-M;
the input end of the storage battery management unit is connected with the voltage detection unit, the battery current detection unit, the first insulation detection unit and the second insulation detection unit, and the output end of the storage battery management unit is connected with the storage battery charging and discharging circuit and the Buck converter.
The portable direct current power supply device of the transformer substation further comprises a plurality of first output ports which are arranged between the voltage small buses +HM and-M in parallel connection and a plurality of second output ports which are arranged between the voltage small buses +KM and-M in parallel connection;
the first output port and the second output port are both provided with LED indicator lamps.
The portable direct-current power supply device of the transformer substation further comprises a first miniature circuit breaker and a second miniature circuit breaker, wherein the first miniature circuit breaker is arranged between the output end of the VIENNA rectifier and the voltage busbar +HM and-M, and the second miniature circuit breaker is arranged between the output end of the VIENNA rectifier and the storage battery charging and discharging circuit.
The portable direct-current power supply device of the transformer substation further comprises a third miniature circuit breaker and a third insulation monitoring unit, wherein the third miniature circuit breaker is arranged between the VIENNA rectifier and the three-phase alternating current, and the third insulation monitoring unit is arranged between the three-phase alternating current and the third miniature circuit breaker.
Two VIENNA rectifiers are connected in parallel.
The portable direct-current power supply device of the transformer substation further comprises a display unit and a communication unit, wherein the display unit and the communication unit are connected with the management unit; the management unit adopts a 32-bit singlechip with an ARMCortex M4 kernel.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model provides a portable direct current power supply device of a transformer substation, which can output stable multi-voltage direct current power supply through a storage battery charging and discharging circuit after being connected into alternating current 380V three-phase four-wire mains supply during working, is applicable to load power supply requirements of different working conditions, and provides the safety of the power supply through real-time monitoring of multiple parameters of the power supply. The utility model is suitable for various field operation and maintenance scenes of the transformer substation, such as field test, charging machine improvement, feeder line screen improvement, storage battery replacement/activation and the like.
Drawings
Fig. 1 is a block diagram of a portable dc power supply device for a transformer substation according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a portable dc power supply device for a transformer substation according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments; all other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1-2, an embodiment of the present utility model provides a portable dc power supply device for a transformer substation, which includes a VIENNA rectifier V1, a storage battery charging and discharging circuit, a Buck converter, a management unit, a battery voltage detection unit, a battery current detection unit LEM1, a first insulation detection unit, and a second insulation detection unit. The input end of the VIENNA rectifier V1 is connected with the three-phase alternating current, the output end of the VIENNA rectifier V1 is connected with a voltage busbar +HM and-M, the output end of the VIENNA rectifier V1 is also connected with the storage battery through the charge-discharge circuit, and the voltage detection unit and the battery current detection unit are respectively used for detecting the voltage and the charge-discharge current of the storage battery; the output end of the VIENNA rectifier V1 is further connected with the voltage busbar +KM and the voltage busbar-M through a Buck converter, the first insulation detection unit is connected between the voltage busbar +HM and the voltage busbar-M, and the second insulation detection unit is connected between the voltage busbar +KM and the voltage busbar-M. The input end of the storage battery management unit is connected with the signal output ends of the VIENNA rectifier V1, the voltage detection unit, the battery current detection unit, the first insulation detection unit and the second insulation detection unit, and the output end of the storage battery management unit is connected with the storage battery charging and discharging circuit and the Buck converter.
Further, as shown in fig. 2, the portable dc power supply device for a transformer substation according to the present embodiment further includes a plurality of parallel first output ports C32 disposed between the voltage buss +hm and-M, and a plurality of parallel second output ports C16 disposed between the voltage buss +km and-M; the first output port and the second output port are both provided with LED indicator lamps and idle switches. Wherein the first output port is for powering a first load and the second output port is for powering a second load.
Further, as shown in fig. 2, the portable dc power supply device for a transformer substation of this embodiment further includes a first miniature circuit breaker 2Q and a second miniature circuit breaker 6Q, where the first miniature circuit breaker 2Q is disposed between the output end of the VIENNA rectifier and the voltage busbar +hm and-M, and the second miniature circuit breaker 6Q is disposed between the output end of the VIENNA rectifier and the charging and discharging circuit of the storage battery. In addition, the fuse is further arranged between the first insulation detection unit and the corresponding voltage busbar, so that a protection effect is achieved.
Further, as shown in fig. 2, the portable dc power supply device for a transformer substation according to the present embodiment further includes a third miniature circuit breaker 1Q and a third insulation monitoring unit, where the third miniature circuit breaker 1Q is disposed between the third miniature circuit breaker and the three-phase ac power.
Further, as shown in fig. 2, the portable dc power supply device for a transformer substation according to the present embodiment further includes a VIENNA rectifier V2, where two VIENNA rectifiers are connected in parallel. By arranging two rectifiers in parallel, the portable power supply can be more reliable. Further, in this embodiment, a current sensor LEM2 is further disposed between the output end of the Buck converter and the voltage busbar +km, so as to detect a current value on the voltage busbar +km.
Further, in this embodiment, the management unit adopts a 32-bit singlechip with an armcotex m4 kernel; the portable direct-current power supply device of the transformer substation further comprises a display unit and a communication unit, wherein the display unit and the communication unit are connected with the management unit. The management unit communicates with the upper monitoring system through a communication module (RS 485). The display unit can display the monitoring data and the alarm information of the device in real time.
The working principle of this embodiment is as follows: when the third insulation monitoring unit detects that the three-phase voltage insulation is normal, the third miniature circuit breaker 1Q is closed, the network side input filter inductance of the VIENNA rectifier adopts a high-frequency Fe-Si-Al inductor, compared with the power frequency alternating current filter inductance of the traditional three-level rectifier, the filter inductance is reduced in volume, and therefore the VIENNA rectifier has the characteristics of small volume, high integration level, convenience in carrying and the like; the VIENNA rectifier converts the three-phase voltage into direct-current voltage to charge the storage battery, the battery voltage detection unit and the battery current detection unit detect working parameters of the battery, including single battery voltage, temperature, internal resistance, charge-discharge current and the like of the storage battery, the working parameters are sent to the management unit, real-time monitoring of the operation parameters of the storage battery is achieved, a battery state on-line monitoring system is arranged in the management unit and is responsible for measuring and calculating the voltage, the charge-discharge current and the internal resistance of the multi-path storage battery, and the performance of the battery is judged according to the measured data. The management unit communicates with the upper monitoring system through RS485 communication; meanwhile, the direct current voltage (220V or 110V) output by the VIENNA rectifier supplies power to the first loads on the voltage buses +HM and-M, and in addition, the Buck converter connected in series with the VIENNA rectifier can perform voltage conversion to be converted into 110V or 48V direct current voltage to supply power to the second loads on the voltage buses +KM and-M. When three-phase electricity is disconnected, the storage battery provides temporary voltage for the load through the storage battery charging and discharging circuit, and provides energy for maintenance or test, meanwhile, three insulation detection units can ensure the safety of the power supply, and the current sensor LEM2 can detect the current value on the voltage busbar +KM and send the current value to the management unit, and the safety of the power supply is further improved through multi-azimuth parameter monitoring of the power supply.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (6)
1. The portable direct current power supply device of the transformer substation is characterized by comprising a VIENNA rectifier, a storage battery charging and discharging circuit, a Buck converter, a management unit, a battery voltage detection unit, a battery current detection unit, a first insulation detection unit and a second insulation detection unit;
the input end of the VIENNA rectifier is connected with three-phase alternating current, the output end of the VIENNA rectifier is connected with voltage busbar +HM and-M, the output end of the VIENNA rectifier is also connected with the storage battery through a storage battery charging and discharging circuit, and the battery voltage detection unit and the battery current detection unit are respectively used for detecting the voltage and the charging and discharging current of the storage battery; the output end of the VIENNA rectifier is also connected with a voltage busbar +KM and a voltage busbar-M through a Buck converter, the first insulation detection unit is connected between the voltage busbar +HM and the voltage busbar-M, and the second insulation detection unit is connected between the voltage busbar +KM and the voltage busbar-M;
the input end of the management unit is connected with the battery voltage detection unit, the battery current detection unit, the first insulation detection unit and the second insulation detection unit, and the output end of the management unit is connected with the storage battery charging and discharging circuit and the Buck converter.
2. The portable direct current power supply device of a transformer substation according to claim 1, further comprising a plurality of parallel first output ports arranged between the voltage buss +hm and-M, and a plurality of parallel second output ports arranged between the voltage buss +km and-M;
the first output port and the second output port are both provided with LED indicator lamps.
3. The portable dc power supply unit of claim 1, further comprising a first miniature circuit breaker disposed between the output of the VIENNA rectifier and the voltage buss +hm and-M, and a second miniature circuit breaker disposed between the output of the VIENNA rectifier and the battery charging and discharging circuit.
4. The portable dc power supply device of claim 1, further comprising a third miniature circuit breaker disposed between the VIENNA rectifier and the three-phase ac power, and a third insulation monitoring unit disposed between the three-phase ac power and the third miniature circuit breaker.
5. The portable dc power supply unit of claim 1, wherein two of said VIENNA rectifiers are connected in parallel.
6. The portable direct current power supply device of a transformer substation according to claim 1, further comprising a display unit and a communication unit, wherein the display unit and the communication unit are connected with the management unit; the management unit adopts a 32-bit singlechip with an ARMCortex M4 kernel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321827858.6U CN220401457U (en) | 2023-07-12 | 2023-07-12 | Portable DC power supply device for transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321827858.6U CN220401457U (en) | 2023-07-12 | 2023-07-12 | Portable DC power supply device for transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220401457U true CN220401457U (en) | 2024-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321827858.6U Active CN220401457U (en) | 2023-07-12 | 2023-07-12 | Portable DC power supply device for transformer substation |
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| Country | Link |
|---|---|
| CN (1) | CN220401457U (en) |
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2023
- 2023-07-12 CN CN202321827858.6U patent/CN220401457U/en active Active
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