CN106549501B - Intelligent management monitoring unit for communication power supply and transformer substation communication power supply system - Google Patents
Intelligent management monitoring unit for communication power supply and transformer substation communication power supply system Download PDFInfo
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- CN106549501B CN106549501B CN201611132467.7A CN201611132467A CN106549501B CN 106549501 B CN106549501 B CN 106549501B CN 201611132467 A CN201611132467 A CN 201611132467A CN 106549501 B CN106549501 B CN 106549501B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an intelligent management monitoring unit for a communication power supply and a transformer substation communication power supply system, wherein a direct-current power supply unit of the communication power supply comprises a charging bus, a power supply bus, a power distribution bus, a plurality of storage batteries, a DC rectifying power supply and the charging power supply, wherein the charging of the storage batteries is controlled by a first electronic switch, the discharging of the storage batteries is controlled by a second electronic switch, the DC rectifying power supply is electrically connected with the power supply bus, a current measuring cable is arranged between the power supply bus and the power distribution bus, and the intelligent management monitoring unit comprises a voltage sampling module for detecting the voltages of the power distribution bus, the DC rectifying power supply and each storage battery, a current sampling module for detecting the current of the current measuring cable and a power distribution control module connected with the first electronic switch and the second electronic switch. The invention can reduce the power supply faults of the communication power supply by monitoring the faults of all the power supply components on the premise of ensuring the power supply safety.
Description
Technical Field
The invention relates to an intelligent management monitoring unit for a communication power supply and a transformer substation communication power supply system.
Background
The substation communication power supply is used for supplying power to the communication equipment and ensuring the power supply safety of the communication equipment.
The substation communication power supply is mainly a 48V power supply, power supply requirements of other voltage levels are auxiliary, and a typical communication power supply framework is shown in fig. 1 and consists of an alternating current distribution panel, a direct current power supply part, uninterruptible power supply equipment (AC 220/380V) and the like. The direct current power supply part consists of a rectifier, a storage battery, a direct current converter (DC/DC), an alternating current converter (DC/AC), a direct current distribution panel and the like.
The electrical structure of a dc supply section consisting of several batteries and a rectifier etc. is shown in fig. 2, wherein the ac power of the rectifier is led in by an ac distribution panel, the output of the rectifier is connected with the batteries and the load through the dc distribution panel, and the rectifier is connected in parallel with the batteries for supplying power to the communication device.
In the process of maintaining the communication power supply, the floating charge power supply mode is adopted, all the storage batteries are in a floating charge state in the long-term working process, the storage battery fault rate is high, the storage batteries are frequently replaced, and the power supply fault of the communication power supply caused by the storage battery fault and the fault removal operation occurs. In addition, each storage battery in the direct current power supply part of the communication power supply is in a floating charge state, and is difficult to find when part of storage batteries fail, so that intelligent management and monitoring are inconvenient, and technical measures are necessary to be taken for improvement and supervision.
Disclosure of Invention
The present invention is directed to an intelligent management monitoring unit for a communication power supply, which is capable of monitoring a communication power supply fault.
The invention also aims to provide a transformer substation communication power supply system so as to monitor faults of communication power supply components.
To this end, the invention provides an intelligent management monitoring unit for a communication power supply, which comprises a direct current power supply unit, wherein the direct current power supply unit comprises a plurality of storage batteries, a charging bus, a power supply bus, a power distribution bus used for supplying power to a plurality of communication devices, a DC rectification power supply and a charging power supply, wherein the charging of the storage batteries is controlled by a first electronic switch, the discharging of the storage batteries is controlled by a second electronic switch, the DC rectification power supply is electrically connected with the power supply bus, a current measurement cable is arranged between the power supply bus and the power distribution bus, the intelligent management monitoring unit comprises a voltage sampling module used for detecting the voltages of the power distribution bus, the DC rectification power supply and the storage batteries, a current sampling module used for detecting the currents of the current measurement cable, and a power distribution control module connected with the first electronic switch and the second electronic switch in a signal connection mode, wherein the current sampling module and the voltage sampling module are connected with a signal input end of the power distribution control module.
Further, the power distribution control unit includes: the power distribution control unit comprises a processor, a memory electrically connected with the processor, a key, a display screen, a clock chip, a CMOS battery, a communication module in communication connection with the processor, and a first electronic switch control circuit and a second electronic switch control circuit electrically connected with the processor, wherein the current sampling module and the voltage sampling module are in signal connection with a signal input end of the power distribution control unit.
Further, the first electronic switch control circuit includes a photocoupler and a driving circuit electrically connected to the photocoupler.
Further, the current sampling module comprises a Hall current sensor in non-contact fit with the current measuring cable and a processing circuit for processing detection signals of the Hall current sensor, and the voltage sampling module comprises a voltage sampler and a voltage comparator.
Further, a power supply line which is controlled to be on-off by a third electronic switch is arranged between the communication equipment and the distribution bus, and the third electronic switch is in control connection with the distribution control module.
Further, the first electronic switch and the second electronic switch are unidirectional thyristor switches, and a control electrode of each unidirectional thyristor switch is electrically connected with a control end of the power distribution control module.
Further, the DC rectified power supply includes an input filter, a transformer, a rectifier network, and an output filter, wherein the rectifier network is connected through an inter-phase converter, and the output filter is connected to an output side of the rectifier network, and includes a voltage modulation attenuator, where the voltage modulation attenuator includes a capacitor, an inductor, a reverse diode, and a plurality of forward diodes.
According to another aspect of the invention, a transformer substation communication power supply system is provided, which comprises a direct current power supply unit, wherein the direct current power supply unit comprises a plurality of storage batteries, a charging bus, a power supply bus, a power distribution bus used for supplying power to a plurality of communication devices, a DC rectifying power supply and a charging power supply, wherein the charging of the storage batteries is controlled by a first electronic switch, the discharging of the storage batteries is controlled by a second electronic switch, the DC rectifying power supply is electrically connected with the power supply bus, and a current measuring cable is arranged between the power supply bus and the power distribution bus and used for measuring power supply current in cooperation with a current sampling module.
Further, the transformer substation communication power supply system further comprises a voltage sampling module for detecting voltages of the distribution bus, the DC rectification power supply and the storage batteries, a current sampling module for detecting currents of the current measurement cable, and a power distribution control module in control connection with the first electronic switch and the second electronic switch, wherein the current sampling module and the voltage sampling module are in signal connection with a signal input end of the power distribution control module.
Further, the first electronic switch and the second electronic switch are unidirectional thyristor switches, and a control electrode of each unidirectional thyristor switch is electrically connected with a control end of the power distribution control module.
According to the intelligent management monitoring unit for the communication power supply, the direct current power supply unit of the communication power supply adopts a three-bus type architecture: charging bus, power supply bus, distribution bus to the convenience is monitored the charging, discharging and the trouble of battery 1 to battery N, is the electric current measurement cable between power supply bus and the distribution bus, in order to conveniently adopt hall current sensor to carry out non-contact measurement to the electric current of distribution bus. In the invention, the DC rectifying power supply and part of the storage batteries are alternately matched to supply power to the power supply bus, and compared with the state that all the storage batteries in the prior art are always in floating charge, the intelligent management monitoring unit can detect the voltage and current of each storage battery and each DC rectifying module, thereby realizing the purpose of safety monitoring. On the premise of ensuring the power supply safety, the charging and discharging of each storage battery are controlled in a strategic way, so that the power supply faults of the communication power supply caused by the storage battery faults and the fault removal operation can be reduced.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art architecture of an intelligent management monitoring unit for a communication power supply;
FIG. 2 is a schematic diagram of a prior art DC power supply portion of an intelligent management monitoring unit for a communications power supply;
FIG. 3 is a schematic diagram of the architecture of a substation communication power supply system according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a DC rectified power supply of a substation communication power supply system according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a power distribution control module for an intelligent management monitoring unit for a communications power supply in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a voltage sampling module for an intelligent management monitoring unit for a communication power supply according to an embodiment of the present invention; and
fig. 7 is a schematic diagram of a current sampling module for an intelligent management monitoring unit for a communication power supply according to an embodiment of the present invention.
Description of the reference numerals
11. A charging bus; 12. A power supply bus;
13. a power distribution bus; 14. A storage battery;
15. a DC rectifying power supply; 16. A current measurement cable;
17. a power distribution control module; 18. A current sampling module;
19. a voltage sampling module; 21. A first electronic switch;
22. a second electronic switch; 23. A third electronic switch;
24. a hall current sensor; 25. A diode;
26. a charging power supply; 27. A communication device;
31. a socket; 32. An input filter;
33. a transformer; 34. An interphase changer;
35. a rectifier network; 36. A rectifier network;
37. an output filter; 38. A voltage modulation attenuator;
39. an inductor; 51. A reverse diode;
52. a capacitor; 53. A forward diode;
54. a forward diode; 55. A plurality of forward diodes.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Fig. 3-7 illustrate some embodiments according to the invention.
As shown in fig. 3, the substation communication power supply system includes a direct current power supply unit including a charging bus 11, a power supply bus 12, a distribution bus 13, a DC rectifying power supply 15, a plurality of storage batteries 14, a charging power supply 26, a distribution control module 17, a current sampling module 18, and a voltage sampling module 19.
The charging power supply 26 is electrically connected with the charging bus 11 and is used for charging and discharging the charging bus 11, each communication device 27 is connected with the power supply bus 12, a charging circuit controlled to be on-off by the first electronic switch 21 is arranged between each storage battery 14 and the charging bus 11, a discharging circuit controlled to be on-off by the second electronic switch 22 is arranged between each storage battery 14 and the power supply bus 12, the DC rectifying power supply 15 is directly electrically connected with the power supply bus and supplies power to the power supply bus, and a current measuring cable 16 is arranged between the power supply bus 12 and the power distribution bus 13 and is used for measuring power supply current in cooperation with the current sampling module.
The above-mentioned power distribution control module 17 is in control connection with the first electronic switch 21 and the second electronic switch 22, and is used for controlling the charging and discharging of the plurality of storage batteries 14, the current sampling module 18 is used for detecting the current of the current measurement cable, the voltage sampling module 19 is used for determining whether the DC rectifying power source is disconnected by detecting the voltages (as shown in fig. 3, the sampling points are p1, p2, p3, and p 4) of the DC rectifying power source 15, each storage battery 14, and the power distribution bus 13, wherein the current sampling module 18 and the voltage sampling module 19 are electrically connected with the power distribution control module 17, and are used for providing the collected signals to the power distribution control module 17.
Preferably, the first electronic switch 21 and the second electronic switch 22 are unidirectional thyristor switches, the control poles a and b of the first electronic switch and the control poles c and d of the second electronic switch are connected with the output control end a, b, c, d on the power distribution control module in a one-to-one correspondence manner, and the voltage is applied to the control pole a, b, c, d to control the on-off of the circuit.
Preferably, a diode 25 is provided on the line between the DC rectified power supply and the supply bus 12 to prevent interference of the supply bus with the DC rectified power supply.
Compared with the prior art that the whole storage battery is in a floating charge state and faults of the storage battery and faults of other components are difficult to monitor, the communication power supply system architecture is convenient to monitor faults of the DC rectification power supply and the storage batteries. During the charging process, it is known whether the battery is in a fault state by monitoring the battery voltage.
In the invention, the whole floating charge state of the storage battery in the prior art is changed into a controlled charge and discharge state, and the service life of the storage battery can be prolonged by selecting a proper charge and discharge control strategy, and one feasible charge and discharge control strategy is as follows: the DC rectified power supply and a part of the storage batteries are alternately supplied, wherein the amplitude of the storage batteries is larger than that of the DC rectified power supply, the number of storage batteries corresponding to the total power of the communication device is discharged first, and when the voltage of the storage batteries drops to the amplitude of the DC rectified power supply, the diode 25 of the DC rectified power supply is conducted to supply power. According to the charging and discharging strategy of the storage battery, after the DC rectifying power supply works for a preset time, another batch of storage batteries which are equivalent to the total power of the communication equipment are put into the power supply, the storage batteries of the replaced part are charged and wait, when the detected voltage or current fluctuates, a quantity of storage batteries which are equivalent to the differential power are put into the power supply, and by adopting the charging and discharging control strategy, the storage batteries are in a normal use state, and compared with a floating charging mode, the service life of the storage batteries is ensured, and the whole storage batteries are prevented from being in a floating charging state to damage the service life.
In one embodiment, the distribution bus bars are hooked up to large capacity fast discharging capacitors to compensate for voltage fluctuations.
In a preferred embodiment, as shown in fig. 4, a DC rectified power supply architecture is presented, the DC rectified power supply 15 comprising: a receptacle 31, an input filter 32, a transformer 33, rectifier networks 35 and 36, and an output filter 37, the output filter 37 being electrically connected to the distribution bus 13. The rectifier networks 35 and 36 are connected through an interphase transformer 34 to magnetically couple the delta-type secondary coil and the Y-type secondary coil. The output filter 37 is connected on the output side of the rectifier networks 35 and 36, comprising a voltage modulated attenuator 38, the voltage modulated attenuator 38 comprising a capacitor 52, an inductor 39, a reverse diode 51 and a plurality of forward diodes 53, 54 and 55. In the present embodiment, the voltage modulation attenuator provides an improved flat DC output voltage by providing reduced voltage ripple and by providing reduced voltage ripple. For the function and principle of DC power, reference is made to the technical content of chinese patent document CN101826809a, the entire contents of which are incorporated herein by reference.
In one embodiment, as shown in fig. 5, a power distribution control unit includes: the power distribution control unit comprises a processor, a memory electrically connected with the processor, keys, a display screen, a clock chip and a CMOS battery, a communication module in communication connection with the processor, a first electronic switch control circuit and a second electronic switch control circuit which are electrically connected with the processor, wherein the current sampling module and the voltage sampling module are in signal connection with a signal input end of the power distribution control unit. The first electronic switch control circuit and the second electronic switch control circuit respectively comprise a photoelectric coupler and a driving circuit connected with the photoelectric coupler.
In one embodiment, as shown in fig. 6, the voltage sampling module includes a plurality of detection units, and each detection unit includes voltage dividing resistors R1 and R2, a voltage comparator A2, a resistor R3, and a resistor R4.
Referring to fig. 5 and 6 in combination, in the present embodiment, the sampled voltages from the voltage dividing resistors R1, R2 are compared with the reference power supply, the voltage amplitude is monitored, if the voltage amplitude is smaller than the reference power supply (corresponding to the amplitude of the DC rectified power supply), an interrupt signal is generated by the voltage comparator A2 and sent to the processor MCU, and the clock chip records the date and time when the communication interrupt occurs and sends to the AT24C02 for storage. To keep the data reliable, the clock chip and the memory chip are powered using button CMOS batteries. The processor MCU chip is communicated with the upper computer through a MODBUS protocol so as to inquire and control a communication power supply. The first electronic switch, the second electronic switch and the third electronic switch are controlled by the driving circuit to control the charge and discharge state of the storage battery and the power supply state of the communication equipment, the key is used for setting the initial working state and time of the module, and the LCD displays the working state in real time.
In one embodiment, a power supply line controlled to be turned on or off by the third electronic switch 23 is arranged between the communication device 27 and the distribution bus 13, and the distribution control module 17 is connected with the control poles e and f of the third electronic switch 23 in a control manner.
In one embodiment, referring to fig. 5 and 7 in combination, the voltage sampling unit includes a hall current sensor 24, a UGV-3501M type linear output hall integrated circuit, a resistor R1, a resistor R2, adjustable resistors RP1, RP2, RP3, capacitors C1, C2, and an AD522 instrumentation amplifier, and the connection relationship of the elements is shown in the figure. With this current sampling means, the current value flowing through the current measurement cable 16 can be detected, and the amount of power supply input to the battery can be adjusted according to fluctuation of the current value.
In the invention, a power distribution control module adopts a 1U design, is installed by a standard frame, controls the throwing sequence and throwing time of a storage battery 1 to a storage battery N, the charging sequence and charging time of the storage battery 1, determines whether the storage battery 1 to the storage battery N have faults according to voltage fluctuation of the storage battery 1 in the charging process, determines whether a DC rectifying power supply has faults according to the amplitude of the DC rectifying power supply, and performs statistics and alarm if the faults exist.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The intelligent management monitoring unit is used for a communication power supply and comprises a direct current power supply unit, and is characterized in that the direct current power supply unit comprises a plurality of storage batteries, a charging bus, a power supply bus, a power distribution bus, a DC rectification power supply and a charging power supply, wherein the power distribution bus, the DC rectification power supply and the charging power supply are used for supplying power to a plurality of communication devices, the charging power supply is electrically connected with the charging bus, a charging circuit controlled to be on-off by a first electronic switch is arranged between each storage battery and the charging bus, charging of the storage batteries is controlled by the first electronic switch, a discharging circuit controlled to be on-off by a second electronic switch is arranged between each storage battery and the power supply bus, discharging of the storage batteries is controlled by the second electronic switch, a current measuring cable is arranged between the power supply bus and the power distribution bus, the intelligent management monitoring unit comprises a voltage sampling module used for detecting voltages of the power distribution bus, the DC rectification power supply and each storage battery, a current sampling module used for detecting currents of the current measuring cable, and a power distribution control module connected with the first electronic switch and the second electronic switch, a power distribution control module connected with the power distribution control module, a power distribution signal sampling module connected with a third electronic switch control module, and a power distribution signal sampling end connected with the power distribution control module.
2. The intelligent management monitoring unit for a communication power supply of claim 1, wherein the power distribution control module comprises: the electronic device comprises a processor, a memory electrically connected with the processor, keys, a display screen, a clock chip, a CMOS battery, a communication module in communication connection with the processor, and a first electronic switch control circuit and a second electronic switch control circuit which are electrically connected with the processor.
3. The intelligent management and monitoring unit for a communication power supply according to claim 2, wherein the first electronic switch control circuit comprises a photo coupler and a driving circuit electrically connected to the photo coupler.
4. The intelligent management monitoring unit for a communication power supply according to claim 2, wherein the current sampling module includes a hall current sensor in non-contact engagement with the current measurement cable and a processing circuit for processing a detection signal of the hall current sensor, and the voltage sampling module includes a voltage sampler and a voltage comparator.
5. The intelligent management and monitoring unit for a communication power supply according to claim 1, wherein the first electronic switch and the second electronic switch are unidirectional thyristor switches, and a control electrode of each unidirectional thyristor switch is electrically connected with a control end of the power distribution control module.
6. The intelligent management monitoring unit for a communication power supply of claim 1, wherein the DC rectified power supply comprises an input filter, a transformer, a rectifier network, and an output filter, wherein the rectifier network is connected through an inter-phase converter, the output filter is connected on an output side of the rectifier network, comprising a voltage modulated attenuator comprising a capacitor, an inductor, a reverse diode, and a plurality of forward diodes.
7. The transformer substation communication power supply system comprises a DC power supply unit, and is characterized in that the DC power supply unit comprises a plurality of storage batteries, a charging bus, a power supply bus, a power distribution bus, a DC rectification power supply and a charging power supply, wherein the power distribution bus is used for supplying power to a plurality of communication devices, the charging power supply is electrically connected with the charging bus, a charging circuit controlled to be on-off by a first electronic switch is arranged between each storage battery and the charging bus, the charging of the storage batteries is controlled by the first electronic switch, a discharging circuit controlled to be on-off by a second electronic switch is arranged between each storage battery and the power supply bus, the discharging of the storage batteries is controlled by the second electronic switch, the DC rectification power supply is electrically connected with the power supply bus, a current measurement cable is arranged between the power supply bus and the power distribution bus, and is used for realizing the measurement of power supply current in cooperation with a current sampling module,
the system also comprises a voltage sampling module for detecting the voltage of the distribution bus, a DC rectification power supply and each storage battery, a current sampling module for detecting the current of the current measurement cable, and a distribution control module in control connection with the first electronic switch and the second electronic switch, wherein the current sampling module and the voltage sampling module are in signal connection with the signal input end of the distribution control module,
and a power supply circuit which is controlled to be switched on and off by a third electronic switch is arranged between the communication equipment and the distribution bus, and the third electronic switch is connected with the distribution control module in a control way.
8. The substation communication power supply system according to claim 7, wherein the first electronic switch and the second electronic switch are unidirectional thyristor switches, and wherein a control electrode of the unidirectional thyristor switch is electrically connected to a control terminal of the distribution control module.
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| CN110277823B (en) * | 2019-06-06 | 2021-06-15 | 华为技术有限公司 | Power supply circuit and inverter |
| CN110376926B (en) * | 2019-07-22 | 2021-02-09 | 武汉恒泰通技术有限公司 | Intelligent management system for intelligent integrated power protection switch |
| CN112421769A (en) * | 2020-10-13 | 2021-02-26 | 国家电网有限公司 | Intelligent remote monitoring system for communication power supply equipment |
| CN113595417A (en) * | 2021-07-29 | 2021-11-02 | 广东电网有限责任公司 | Electric power direct current power supply device modularization system |
| CN113922476B (en) * | 2021-09-30 | 2024-03-26 | 石家庄通合电子科技股份有限公司 | High-safety module group direct-current power supply |
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| CN203135572U (en) * | 2012-09-17 | 2013-08-14 | 北京慧智神光科技有限公司 | Transformer substation DC device state monitoring system |
| CN102946144A (en) * | 2012-11-25 | 2013-02-27 | 山东电力集团公司淄博供电公司 | Transformer substation direct-current power supply information management system based on three-stage network architecture |
| CN103051052A (en) * | 2012-12-17 | 2013-04-17 | 江苏大唐科源电气有限公司 | Intelligent alternative-direct-current integrated power supply system |
| CN103066692A (en) * | 2013-01-14 | 2013-04-24 | 中国能源建设集团广东省电力设计研究院 | Communication power supply and state-use direction current power supply integrated for transformer substation use design scheme |
| CN204103599U (en) * | 2014-09-15 | 2015-01-14 | 福建亿华源能源管理有限公司 | Layered distribution type hydroelectric station Direct Current Power Supervise Control System |
| CN104682556A (en) * | 2014-12-16 | 2015-06-03 | 国家电网公司 | Remote intelligent maintenance system for direct current power supply of transformer substation and application of remote intelligent maintenance system |
| CN205407350U (en) * | 2016-03-08 | 2016-07-27 | 武汉瑞源电力设备有限公司 | Lithium ion battery electric power and for communication DC power supply system |
| CN105680559A (en) * | 2016-04-06 | 2016-06-15 | 国家电网公司 | Substation DC system |
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