CN204992750U - Incessant friendship direct current system of communication terminal of transformer substation - Google Patents

Abstract

The utility model discloses an uninterrupted AC and DC power supply system for a substation communication terminal, which is characterized in that it comprises a mains socket (1), the mains socket (1) is connected to a rectification module (5), and the rectification modules (5) are respectively connected to Dispatching IP phone (4), bidirectional power converter (6), inverter (9), bidirectional power converter (6) connected to function switch (7), function switch (7) connected to lithium battery pack (8), inverter The transformer (9) is connected to the information terminal (2). The utility model is designed as a multifunctional integrated device that can provide both direct current and alternating current. Small size, long service life, safe, stable and reliable.

Description

An uninterrupted AC and DC power supply system for substation communication terminals

technical field

The utility model relates to a power supply for electric power communication and information terminal equipment of a grid enterprise, in particular to an uninterrupted AC and DC power supply system for a communication terminal in a substation, which belongs to the technical field of electric power communication.

Background technique

With the development of science and technology, most of the substations of electric power enterprises have been realized unattended through the automation system. The monitoring terminals are equipped in the substations, which are used for on-site switch operation, operation and maintenance, and check the substation system wiring diagrams, operation tickets, work tickets, etc. , to meet the needs of system operation. Power dispatching telephones have also begun to use technologically advanced IP telephones. For power dispatching telephones, high reliability is required. Not only under normal conditions, but also under severe weather conditions and when accidents occur in the power system, the smooth flow of the telephone must also be guaranteed. The safe and stable operation of the two is indispensable to the safety of the power grid. The existing communication DC power supply system of the substation is generally considered to supply power to the communication equipment in the communication room, and does not consider the power supply requirements of the information terminal in the main control room and the newly installed IP phone in the station. Electric power supply (see Figure 1). The auxiliary power supply 3 of the electrical equipment information terminal 2 and the dispatching IP phone 4 is connected to the mains socket 1 through the power strip (the dispatching IP phone 4 needs DC power supply, and the AC 220V mains power is converted into DC through the auxiliary power supply 3). This power supply method has great potential safety hazards, which are mainly reflected in the following two points: First, if the power strip fails and the power is cut off, the information terminal and IP phone in the station will be powered off and shut down at the same time. Second, once an accident occurs in the power grid and the entire substation loses power, it will also cause both of them to be powered off and shut down, unable to play their due role.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art and to provide a multifunctional integrated equipment that can provide both direct current and alternating current, and is small in size, long in service life, safe, stable and reliable. Intermittent AC and DC power supply system.

The purpose of the utility model can be achieved through the following measures: a substation communication terminal uninterrupted AC and DC power supply system, characterized in that it includes a mains socket, the mains socket is connected to a rectifier module, and the rectifier module is respectively connected to a dispatching IP phone, a bidirectional power supply The converter, the inverter, and the bidirectional power converter are connected to the function switch, the function switch is connected to the lithium battery pack, and the inverter is connected to the information terminal.

Compared with the prior art, the utility model can produce the following positive effects: the utility model overcomes the shortcomings of the existing single power supply mode and no backup power supply, and adopts multifunctional integrated equipment to provide both direct current and alternating current, and at the same time It is also equipped with a lithium battery pack for energy storage, which is safe, stable and reliable. When the AC mains power is suddenly lost, the normal use of the information terminal and dispatching telephone can still be guaranteed within an appropriate time. The utility model integrates the functions of an auxiliary power supply, an inverter power supply and a storage battery, adopts low power consumption and high energy storage devices, is small in size and light in weight, and is convenient and flexible to use.

The utility model has AC 220V mains input, through the rectification module, outputs DC power, and directly supplies power to the dispatching IP phone (remove the auxiliary power supply); at the same time, it provides AC output through the inverter to provide safe and stable power for the information terminal. The AC 220V mains supply power to the information terminal after rectification and inversion with low power consumption, which can isolate the influence of grid voltage fluctuation and lightning, and ensure the safety of the information terminal. At the same time, the direct current charges and stores the lithium battery pack through the bidirectional power converter and the functional switch.

Compared with the traditional scheme of using two unidirectional structures to achieve bidirectional energy transmission, the bidirectional power converter has the advantages of less power devices, small size, high power density, and fast switching of transmission directions. In the DC uninterruptible power supply system, when the mains is normal, the grid charges and stores energy for the lithium battery pack through a bidirectional power converter. The inverter supplies power to provide load energy, ensuring the continuity of power supply to the load when the mains fails.

The use of lithium battery packs for energy storage is due to the long cycle life of lithium batteries, flat discharge platform, high voltage and high energy density of a single battery, which means that the battery is relatively light, while the lead-acid battery has a poor cycle life and can be discharged with a large current. Heavy, and both lead and sulfuric acid pollute the environment. The mass ratio and volume ratio of lithium batteries are about 40% higher than that of lead-acid batteries; the current general-purpose lithium iron phosphate has no memory effect after charging 1500 times, and its storage capacity is about 85% after charging 1500 times, while lead-acid batteries are About 500 times, and the memory effect is obvious; the monthly self-discharge of lithium batteries is <3%, and that of lead-acid batteries is 15~30%, the difference is obvious; simply speaking, for batteries with the same capacity, under the condition of high current discharge, lithium batteries are better than lead-acid batteries. The battery discharges about 30% more electricity.

Description of drawings

Figure 1 is a structural block diagram of an existing substation communication terminal AC power supply system;

Fig. 2 is a structural block diagram of the utility model.

detailed description

Below in conjunction with the preferred embodiment of the utility model of accompanying drawing, describe in detail:

Embodiment: An uninterrupted AC and DC power supply system for substation communication terminals (see Figure 2), which includes a rectification module 5, which is respectively connected to a dispatching IP phone 4, a bidirectional power converter 6, and an inverter 9 for bidirectional power conversion The inverter 6 is connected to the function switch 7, the function switch 7 is connected to the lithium battery pack 8, and the inverter 9 is connected to the information terminal 2.

The AC 220V mains power is introduced from the mains socket 1 and converted to DC by the rectification module 5. The output of the rectification module 5 is divided into three circuits, one for the DC load dispatching IP phone 4, and one for the bidirectional power converter 6. When the mains is normal , through the function switch 7 to control the charging of the lithium battery pack 8, when the city power is under-voltage operation or the power is cut off, the lithium battery pack 8 discharges through the function switch 7 and the bidirectional power converter 6 to provide electric energy for the AC and DC load; The inverter 9 supplies power to the AC load information terminal 2 .

Claims (1)

1. the uninterrupted supplied by AC/DC electricity system of transformer substation communication terminal, it is characterized in that: it comprises commercial power socket (1), commercial power socket (1) connects rectification module (5), rectification module (5) connects scheduling IP phone (4), bidirectional power converter (6), inverter (9) respectively, bidirectional power converter (6) linkage function switch (7), functional switch (7) connects lithium battery group (8), inverter (9) link information terminal (2).