Switch power supply system

Abstract

The invention provides a switch power supply system which comprises an alternating current power supply, a direct current power supply, an energy storage battery pack, a rectifier module, a DC / DC converter, a first relay and a second relay. An AC power supply is connected to the first input end of the first relay through the rectification module and is output by the output end to form a first power supply branch. The direct-current power supply is connected to the first input end of the second relay through the DC / DC converter, is connected to the second input end of the first relay through the output end of the second relay, and is output by the output end of the first relay to form a second power supply branch; the energy storage battery pack is firstly connected with a second input end of the second relay, is connected with a second input end of the first relay through an output end, and then is output by an output end of the first relay to form a third power supply branch; the power supply priorities of the first to third power supply branches are from high to low; the first relay and the second relay are single-pole double-throw switch relays. By implementing the invention, the problems of single power supply and insufficient reliability of the existing switch can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply for communication equipment, and particularly to a switch power supply system. BACKGROUND

[0002] At present, the switch in the transformer substation bears dispatching data, communication data and the like, and once the switch is powered off, it has an important influence on power grid dispatching. However, the existing switch in the transformer substation mainly relies on the AC power supply in the transformer substation for power supply, resulting in the problems of single power supply and insufficient reliability. Therefore, it is necessary to improve the power supply mode of the existing switch in the transformer substation. SUMMARY

[0003] The technical problem to be solved by the embodiments of the present application is to provide a switch power supply system, which can solve the problems of single power supply and insufficient reliability of the existing switch.

[0004] In order to solve the above technical problems, the embodiments of the present application provide a switch power supply system for multi-power supply to a specified switch, which comprises an AC power supply, a DC power supply, an energy storage battery pack, a rectifier module, a DC / DC converter, a first relay and a second relay; wherein,

[0005] The AC power supply is first connected to the first input end of the first relay through the rectifier module, and then output from the output end of the first relay to form a first power supply branch for power supply to the switch;

[0006] The DC power supply is first connected to the first input end of the second relay through the DC / DC converter, and then connected to the second input end of the first relay through the output end of the second relay, and then output from the output end of the first relay to form a second power supply branch for power supply to the switch;

[0007] The energy storage battery pack is first connected to the second input end of the second relay, and then connected to the second input end of the first relay through the output end of the second relay, and then output from the output end of the first relay to form a third power supply branch for power supply to the switch;

[0008] Wherein, the power supply priority of the first power supply branch to the third power supply branch is sequentially sorted from high to low; the first relay and the second relay are both single-pole double-throw switch relays.

[0009] Wherein, when the AC power supply is normal, the first power supply branch supplies power to the switch by switching the first input end and the output end of the first relay in communication.

[0010] When the AC power supply is abnormally powered off, the second power supply branch supplies power to the switch through switching the first input end and the output end of the second relay in communication and switching the second input end and the output end of the first relay in communication.

[0011] When the AC power supply and the DC power supply are abnormally powered off, the third power supply branch supplies power to the switch through switching the second input end and the output end of the second relay in communication and switching the second input end and the output end of the first relay in communication.

[0012] The AC power supply is taken from a substation station AC bus, the DC power supply is taken from a substation station DC bus, and the energy storage battery pack is composed of a plurality of 18650 lithium iron phosphate batteries connected in series.

[0013] The AC incoming line switch and the DC incoming line switch are further included.

[0014] The AC incoming line switch is arranged on a connection line between the AC power supply and the rectifier module.

[0015] The DC incoming line switch is arranged on a connection line between the DC power supply and the DC / DC converter.

[0016] The embodiment of the present application has the following beneficial effects:

[0017] The present application forms the first power supply branch to the third power supply branch with the power supply priority in order from high to low by switching the communication relationship between the corresponding input end and the output end of the first relay and the second relay, realizes the multi-power supply mode to supply power to the switch, and thus can solve the problems of single power supply and insufficient reliability of the existing switch. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings obtained according to these drawings without creative labor are still within the scope of the present application.

[0019] Figure 1 The connection diagram of the switch power supply system provided in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the present application in combination with the drawings.

[0021] AsFigure 1 As shown, in the embodiment of the present application, a switch power supply system is provided for multi-power supply to a designated switch, which comprises an AC power supply 1, a DC power supply 2, an energy storage battery pack 3, a rectifier module 4, a DC / DC converter 5, a first relay 6 and a second relay 7; wherein,

[0022] The AC power supply 1 (e.g., taken from the AC bus of a substation) is first connected to the first input end a1 of the first relay 6 through the rectifier module 4, and then output from the output end a0 of the first relay 6 to form a first power supply branch for supplying power to the switch;

[0023] The DC power supply 2 (e.g., taken from the DC bus of a substation) is first connected to the first input end b1 of the second relay 7 through the DC / DC converter 5, and then connected to the second input end a2 of the first relay 6 from the output end b0 of the second relay 7, and then output from the output end a0 of the first relay 6 to form a second power supply branch for supplying power to the switch;

[0024] The energy storage battery pack 3 (e.g., composed of a plurality of 18650 lithium iron phosphate batteries connected in series) is first connected to the second input end b2 of the second relay 7, and then connected to the second input end a2 of the first relay 6 from the output end b0 of the second relay 7, and then output from the output end a0 of the first relay 6 to form a third power supply branch for supplying power to the switch;

[0025] Wherein, the power supply priority of the first power supply branch to the third power supply branch is sequentially arranged from high to low; the first relay 6 and the second relay 7 are both single-pole double-throw switch relays. At this time, by switching the connection relationship between the corresponding input end and output end of the first relay 6 and the second relay 7, the first power supply branch to the third power supply branch with power supply priority sequentially arranged from high to low is formed, and the multi-power supply mode is realized to supply power to the switch.

[0026] In one example, a 18650 lithium iron phosphate battery is generally 3.2V per single and 1000-2000mAh in capacity; the power of a conventional switch in a substation is 15-30W, and the common DC working voltage is 12V or 24V. Therefore, 4-5 18650 lithium iron phosphate batteries are configured for a 12V switch, and 8-9 18650 lithium iron phosphate batteries are configured for a 24V switch.

[0027] In the embodiment of the present application, in order to further control the safe conduction between the AC power supply 1 and the rectifier module 4 in the first power supply branch, and control the safe conduction between the DC power supply 2 and the DC / DC converter 5 in the second power supply branch, the switch power supply system further comprises an AC line switch 8 and a DC line switch 9; the AC line switch 8 is arranged on the connection line between the AC power supply 1 and the rectifier module 4; and the DC line switch 9 is arranged on the connection line between the DC power supply 2 and the DC / DC converter 5.

[0028] It should be noted that, based on the power supply priority and guarantee the normal unidirectional power supply of the switch, at this time, when the AC power supply 1 is normal, the first power supply branch supplies power to the switch by switching the first input end a1 and the output end a0 of the first relay 6 to be in communication. If the AC power supply 1 is abnormal and loses power, the second power supply branch supplies power to the switch by switching the first input end b1 and the output end b0 of the second relay 7 to be in communication, and switching the second input end a2 and the output end a0 of the first relay 6 to be in communication. If the AC power supply 1 and the DC power supply 2 are both abnormal and lose power, the third power supply branch supplies power to the switch by switching the second input end b2 and the output end b0 of the second relay 7 to be in communication, and switching the second input end a2 and the output end a0 of the first relay 6 to be in communication.

[0029] Therefore, the working principle of the switch power supply system in the embodiment of the present application is that the AC power supply 1 directly supplies the rectifier module 4 to convert the station AC into an AC voltage suitable for the operation of the switch.

[0030] When the AC power supply 1 is normally operated, the AC power supply 1 directly supplies power to the switch by switching the first relay 6; when the AC power supply 1 loses power, the DC power supply 2 supplies power to the switch by switching the first relay 6; when the AC power supply 1 and the DC power supply 2 both lose power, the energy storage battery pack 3 composed of 18650 lithium iron phosphate batteries supplies power to the switch by switching the first relay 6 and the second relay 7. It should be noted that when the switch needs to be repaired and maintained, the output fuse of the energy storage battery pack 3 must be disconnected, at which time the energy storage battery pack 3 exits operation.

[0031] The embodiment of the present application has the following beneficial effects:

[0032] The present application switches the communication relationship between the corresponding input end and the output end of the first relay and the second relay to form the first power supply branch to the third power supply branch in order of high to low in power supply priority, realizes the multi-power supply mode to supply power to the switch, and thus can solve the problems of single power supply and insufficient reliability of the existing switch.

[0033] The above only discloses the preferred embodiment of the present application, and of course cannot limit the scope of the right of the present application, so the equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A power supply system for a switch, characterized in that, This system is used to provide multiple power supplies to a designated switch, including an AC power supply, a DC power supply, an energy storage battery pack, a rectifier module, a DC / DC converter, a first relay, and a second relay; among which, The AC power supply is first connected to the first input terminal of the first relay via the rectifier module, and then output from the output terminal of the first relay to form the first power supply branch for powering the switch. The DC power supply is first connected to the first input terminal of the second relay via the DC / DC converter, and then connected to the second input terminal of the first relay via the output terminal of the second relay. Finally, the output terminal of the first relay outputs the power supply to form a second power supply branch for powering the switch. The energy storage battery pack is first connected to the second input terminal of the second relay, and then the output terminal of the second relay is connected to the second input terminal of the first relay. Finally, the output terminal of the first relay outputs to form a third power supply branch for powering the switch. The power supply priorities of the first power supply branch to the third power supply branch are ordered from high to low; the first relay and the second relay are both single-pole double-throw relays.

2. The power supply system for the switch as described in claim 1, characterized in that, When the AC power supply is normal, the first power supply branch supplies power to the switch by switching the connection between the first input terminal and the output terminal of the first relay.

3. The power supply system for the switch as described in claim 2, characterized in that, When the AC power supply fails, the second power supply branch supplies power to the switch by switching the connection between the first input terminal and the output terminal of the second relay, and by switching the connection between the second input terminal and the output terminal of the first relay.

4. The power supply system for the switch as described in claim 3, characterized in that, When both the AC power supply and the DC power supply fail abnormally, the third power supply branch supplies power to the switch by switching the second input terminal of the second relay to the output terminal and switching the second input terminal of the first relay to the output terminal.

5. The power supply system for the switch as described in claim 4, characterized in that, The AC power supply is taken from the AC bus of the substation; the DC power supply is taken from the DC bus of the substation; the energy storage battery pack is composed of multiple 18650 lithium iron phosphate batteries connected in series.

6. The power supply system for the switch as described in claim 5, characterized in that, Also includes: AC incoming line switch and DC incoming line switch; among which, The AC input switch is located on the connection line between the AC power supply and the rectifier module; The DC input switch is located on the connection line between the DC power supply and the DC / DC converter.

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