CN220022406U

CN220022406U - Dual-power switching device applied to DTU and FTU

Info

Publication number: CN220022406U
Application number: CN202321455409.3U
Authority: CN
Inventors: 夏文杰; 王一琛; 杨在然; 戴翔; 陈云国; 张华�
Original assignee: Nanjing SAC Automation Co Ltd
Current assignee: Nanjing SAC Automation Co Ltd
Priority date: 2023-06-08
Filing date: 2023-06-08
Publication date: 2023-11-14
Anticipated expiration: 2033-06-08

Abstract

The utility model relates to the technical field of distribution network automation, and provides a dual power supply switching device applied to a DTU and an FTU, which comprises the following components: the voltage-source-switching power supply comprises a two-wire voltage wiring terminal, a first fuse, a second fuse, a first piezoresistor, a second piezoresistor, a first relay, a second relay and a switching power supply output terminal; the two-line voltage connecting terminal is respectively connected with two bus line voltages in two ways; one end of the two-wire voltage wiring terminal is connected with one end of the first fuse, the first piezoresistor, the first relay and the switching power supply output terminal; the other end of the two-wire voltage wiring terminal is connected with the second fuse, the second piezoresistor, the second relay and the other end of the switching power supply output terminal. According to the scheme of the utility model, the circuit can be protected to prevent short circuit, the voltage of the two bus lines is switched, the normal work of the power distribution terminal is ensured by switching the output voltage of the power supply output terminal, the power failure misoperation is prevented, and the operation reliability of the power distribution terminal is further improved.

Description

Dual-power switching device applied to DTU and FTU

Technical Field

The utility model relates to the technical field of distribution network automation, in particular to a dual power supply switching device applied to a DTU and an FTU.

Background

Along with the planning of comprehensively improving the reliability and the power supply quality of the urban power distribution network, the intelligent and reliable requirements on the power distribution terminal are higher and higher. Conventional power distribution terminals often have the risk of failure in power distribution conversion, and once the conversion is failed, the conversion may cause one of the following two hazards, namely short circuit between power supplies or important load outage (even short power outage), and the consequences are serious, which not only bring about economic loss, but also may cause social problems (putting life and safety into danger).

Disclosure of Invention

The utility model aims to solve at least one technical problem in the background technology and provides a dual power supply switching device applied to a DTU and an FTU.

In order to achieve the above object, the present utility model provides a dual power switching device applied to DTU and FTU, comprising: the voltage-source-switching power supply comprises a two-wire voltage wiring terminal, a first fuse, a second fuse, a first piezoresistor, a second piezoresistor, a first relay, a second relay and a switching power supply output terminal;

the two-line voltage wiring terminals are respectively connected into two paths of bus line voltages in two paths;

one end of the two-wire voltage wiring terminal is connected with one end of the first fuse, the first piezoresistor, the first relay and the switching power supply output terminal;

the other end of the two-wire voltage wiring terminal is connected with the second fuse, the second piezoresistor, the second relay and the other end of the switching power supply output terminal.

According to one aspect of the utility model, the two-wire voltage connection terminal comprises a first phase voltage input terminal, a second phase voltage input terminal, a third phase voltage input terminal and a fourth phase voltage input terminal;

the first phase voltage input end is connected with the input end of the first fuse, the second phase voltage input end is connected with the input end of the first piezoresistor, and the output end of the first fuse is connected with the output end of the first piezoresistor;

the third phase voltage input end is connected with the input end of the second fuse, the fourth phase voltage input end is connected with the input end of the second piezoresistor, and the output end of the second fuse is connected with the output end of the second piezoresistor.

According to one aspect of the utility model, the normally open contacts of the first relay and the second relay are connected to the outputs of the first fuse and the first varistor.

According to one aspect of the utility model, the normally closed contacts of the first relay and the second relay are connected to the output terminals of the second fuse and the second varistor.

According to one aspect of the utility model, the switching power supply output terminal comprises a first output end and a second output end, wherein the first output end is connected with a circuit where normally open contacts of the first relay and the second relay are located and is connected with the output end of the normally open contacts;

the second output end is connected with a circuit where the normally closed contacts of the first relay and the second relay are located and is connected with the output end of the normally closed contacts.

According to the scheme of the utility model, the circuit is protected by the two independent buses through the first fuse, the second fuse, the first piezoresistor and the second piezoresistor through the two line voltage connecting terminals, short circuit is prevented, then the device is quickly switched to supply power through the first relay and the second relay, the switching time can reach 5ms, power supply guarantee is provided for power distribution equipment, control equipment or other electric equipment with extremely high requirements on power supply continuity, when one power supply is over-limited or power-off, the other power supply is quickly switched to ensure equipment operation and data safety, and meanwhile, the delay of 1ms is completed and the circuit switching is achieved through the cooperation between the first coil, the second coil, the first normally-open contact, the second normally-open contact, the first normally-closed contact and the second normally-closed contact, and the short circuit phenomenon is prevented from reducing the short circuit or important load power failure (even short circuit) between the buses through switching of the power supply output terminals, so that economic loss and other social problems are prevented.

According to the scheme, the utility model is integrated in a conventional SWITCH module in a module form and is directly arranged in the power distribution terminal in a module form, so that the reliable and efficient requirements of the power distribution terminal device are met, the hardware cost is reduced, and the space occupation is reduced.

According to the scheme of the utility model, the device can be quickly switched between two independent buses to supply power, the switching time can reach 5ms, the power supply guarantee is provided for power distribution equipment, control equipment or other electric equipment with extremely high requirements on power supply continuity, and when one power supply is over-limited or is powered off, the device is quickly switched to the other power supply, so that the operation and data safety of the device are ensured. The power distribution and utilization device power supply system is an advantageous tool for realizing a so-called distributed power supply scheme, and can greatly improve the reliability of a power distribution and utilization device power supply system. The double-power supply switching device is a double-bus alternative automatic switching system, and in a normal working state, under the condition that the main bus is in a normal voltage range, the load is always connected to the main bus. When the main bus fails, the load is automatically switched to the standby bus, and after the main bus returns to normal, the load is automatically switched to the main bus again. The device adopts a break-before-make (break) switching mode, can realize uninterrupted switching between input buses, provides double-bus power supply for a single-power load, and is used for switching power supply between two independent buses, wherein after a first path of faults, the double-power switching module automatically switches to a second path of power supply for the load, and when the second path of faults, the double-power switching module automatically switches to the first path of power supply for the load. Unlike conventional automatic transfer switches ATS, static transfer switches provide fast load transfer (typically 1/4 cycle), ensuring accurate electronic equipment to operate uninterruptedly. The load re-switching to the main input power is virtually instantaneous (.ltoreq.5 ms) while adding a short circuit prevention design to the module design to prevent shorting from switching the two bus supplies. The method is suitable for uninterrupted power conversion of any two paths of power supplies such as buses and the like. Meanwhile, the normal work of the power distribution terminal is ensured, the power failure misoperation is prevented, and the operation reliability of the power distribution terminal is further improved.

Drawings

Fig. 1 schematically shows a structure of a printed board of a dual power switching device applied to DTU, FTU according to an embodiment of the present utility model;

fig. 2 schematically shows a circuit logic diagram of a dual power switching device applied to DTU, FTU according to one embodiment of the present utility model.

Detailed Description

The present disclosure will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are merely to enable those of ordinary skill in the art to better understand and thus practice the teachings of the present utility model and do not imply any limitation on the scope of the utility model.

As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment.

Fig. 1 schematically shows a structure of a printed board of a dual power switching device applied to DTU, FTU according to an embodiment of the present utility model; fig. 2 schematically shows a circuit logic diagram of a dual power switching device applied to DTU, FTU according to one embodiment of the present utility model. As shown in fig. 1 and 2, in the present embodiment, a dual power switching device applied to a DTU and an FTU includes: the two-wire voltage wiring terminal P1, the first fuse F1, the second fuse F2, the first piezoresistor R1, the second piezoresistor R2, the first relay U1, the second relay U2 and the switching power supply output terminal X1;

the two-line voltage wiring terminal P1 is respectively connected into two paths of bus line voltages;

one voltage input end of the two-wire voltage wiring terminal P1 is connected with one voltage output end of the first fuse F1, the first piezoresistor R1, the first relay U1 and the switching power supply output terminal X1;

the other voltage input end of the two-wire voltage connecting terminal P1 is connected with the second fuse F2, the second piezoresistor R2, the second relay U2 and the other voltage output end of the switching power supply output terminal X1.

In this way, as shown in fig. 1, in this embodiment, the UAB and UBC bus line voltages are respectively connected through the two-line voltage connection terminal P1, the circuit is protected by the first fuse F1 and the second fuse F2, the first piezoresistor R1 and the second piezoresistor R2 to prevent short-circuiting, the UAB and UBC bus line voltages are switched through the first relay U1 and the second relay U2, and the power supply output terminal X1 is switched to output the voltage to ensure the normal operation of the power distribution terminal, prevent the power failure malfunction, and further improve the operational reliability of the power distribution terminal.

Specifically, as shown in fig. 2, in the present embodiment, the two-wire voltage connection terminal P1 includes a first phase voltage input terminal UA, a second phase voltage input terminal UB, a third phase voltage input terminal UB' and a fourth phase voltage input terminal UC;

the first phase voltage input end UA is connected with the input end of a first fuse F1, the second phase voltage input end UB is connected with the input end of a first piezoresistor R1, and the output end of the first fuse F1 is connected with the output end of the first piezoresistor R1;

the third phase voltage input end UB' is connected with the input end of the second fuse F2, the fourth phase voltage input end UC is connected with the input end of the second piezoresistor R2, and the output end of the second fuse F2 is connected with the output end of the second piezoresistor R2.

Further, as shown in fig. 2, in the present embodiment, the first relay U1 includes a first coil U1A, a first normally open contact U1C, and a first normally closed contact U1E; the second relay U2 includes a second coil U2A, a second normally open contact U2D, and a second normally closed contact U2B. In the present embodiment, the input ends of the first normally open contact U1C and the second normally open contact U2D are connected to the output ends of the first fuse F1 and the first varistor R1. The first normally-closed contact U1E and the second normally-closed contact U2B are connected with the output ends of the second fuse F2 and the second piezoresistor R2.

Further, as shown in fig. 2, the switching power supply output terminal X1 includes a first output end UL and a second output end UN, where the first output end UL is connected to the line where the first normally-open contact U1C and the second normally-open contact U2D are located and is connected to the output end of the second normally-open contact U2D, and the first output end UL is also connected to the line where the first normally-closed contact U1E and the second normally-closed contact U2B are located and is connected to the output end of the second normally-closed contact U2B. The second output end UN is respectively connected with the input ends of the first piezoresistor R1 and the second piezoresistor R2. One end of the first coil U1A and one end of the second coil U2A are respectively connected with the input ends of the first normally-open contact U1C and the second normally-open contact U2D, and the other end of the first coil U1A and the second coil U2A are connected with the second output end UN.

According to the arrangement, two independent buses of UAB and UBC are connected through the two-line voltage connecting terminals P1, the circuits are protected through the first fuse F1 and the second fuse F2 and the first piezoresistor R1 and the second piezoresistor R2, short circuits are prevented, then the power is rapidly converted to be supplied to the device through the first relay U1 and the second relay U2, the conversion time can reach 5ms, power supply guarantee is provided for power distribution equipment, control equipment or other electric equipment with extremely high requirements on power supply continuity, when one power supply is overrun or power failure, the power supply is rapidly switched to the other power supply, the operation and data safety of the equipment are guaranteed, meanwhile, UAB and UBC line switching is completed through the cooperation between the first coil U1A and the second coil U2A and the first normally-open contact U1C and the second normally-closed contact U2D, and the first normally-closed contact U1E and the second normally-closed contact U2B, the short circuits or important loads (even short circuits or short circuit) are prevented from being reduced through switching the power supply output terminals X1 to output UL and UN, and economic losses and other social losses are prevented.

Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the utility model, and that, although the utility model has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the utility model as defined by the appended claims.

Claims

1. Be applied to dual supply auto-change over device of DTU, FTU, its characterized in that includes: the voltage-source-switching power supply comprises a two-wire voltage wiring terminal, a first fuse, a second fuse, a first piezoresistor, a second piezoresistor, a first relay, a second relay and a switching power supply output terminal;

2. The dual power switching device for DTU and FTU according to claim 1, wherein the two-wire voltage connection terminal comprises a first phase voltage input, a second phase voltage input, a third phase voltage input and a fourth phase voltage input;

3. The dual power switching device for DTU and FTU according to claim 1, wherein the normally open contacts of the first and second relays are connected to the outputs of the first fuse and the first varistor.

4. The dual power switching device for DTU and FTU according to claim 3, wherein the normally closed contacts of the first and second relays are connected to the output terminals of the second fuse and the second varistor.

5. The dual power switching device applied to DTU and FTU according to claim 4, wherein the switching power output terminal comprises a first output end and a second output end, the first output end is connected to a line where normally open contacts of the first relay and the second relay are located, and is connected to the output end of the normally open contacts;