CN219893014U - Control circuit of UPS (uninterrupted Power supply) of low-voltage cabinet of molten salt energy storage system - Google Patents

Control circuit of UPS (uninterrupted Power supply) of low-voltage cabinet of molten salt energy storage system Download PDF

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Publication number
CN219893014U
CN219893014U CN202320677447.7U CN202320677447U CN219893014U CN 219893014 U CN219893014 U CN 219893014U CN 202320677447 U CN202320677447 U CN 202320677447U CN 219893014 U CN219893014 U CN 219893014U
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voltage
low
power supply
control circuit
relay
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CN202320677447.7U
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Inventor
刘少雄
项骏杰
张道磊
储威君
程若昱
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Zhejiang Xizi United Engineering Co ltd
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Zhejiang Xizi United Engineering Co ltd
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Abstract

The utility model relates to a control circuit of a UPS (uninterrupted Power supply) of a low-voltage cabinet of a molten salt energy storage system, which comprises a low-voltage cabinet, a low-voltage main power supply, a UPS and a control circuit, wherein the UPS is electrically connected with the low-voltage cabinet through the control circuit, and the control circuit is arranged to disconnect the connection with the low-voltage cabinet when the voltage of the low-voltage main power supply is lower than a preset voltage. The control circuit of the UPS power supply of the molten salt energy storage system, which is designed by the utility model, can automatically cut off the loop of the control circuit when the power grid is powered off or the voltage is low, thereby disconnecting the connection between the UPS power supply and the low-voltage cabinet, preventing the automatic starting of load-end equipment after the main power supply is powered again, and further protecting the equipment from being damaged due to the fact that the power is still electrified when the power grid voltage is low.

Description

Control circuit of UPS (uninterrupted Power supply) of low-voltage cabinet of molten salt energy storage system
Technical Field
The utility model relates to the technical field of control circuits, in particular to a control circuit of a UPS (uninterrupted Power supply) of a low-voltage cabinet of a molten salt energy storage system.
Background
In the prior art, a UPS power source is an uninterruptible power supply, which is used to provide power for equipment when a power grid fails, so as to ensure reliability and stability of the equipment. The UPS power source is typically composed of a battery pack, an inverter, a charger, an automatic transfer switch, a control circuit, and the like. When the power grid supplies power normally, the UPS power supplies power of the power grid to the equipment directly; when the power grid fails, the UPS power supply converts the electric energy of the built-in battery pack into electric power and outputs the electric power to the equipment so as to ensure the normal operation of the equipment. The low-voltage switch cabinet in the fused salt energy storage system often adopts a UPS power supply as a control power supply, so that the load halt caused by power failure of the control power supply due to power grid voltage sag or power fluctuation is avoided, and the larger economic loss is caused.
However, after the low-voltage switch cabinet in the molten salt energy storage system adopts the UPS power supply, a new problem is generated, the UPS is used as an uninterruptible power supply, and even when the main power supply loop is in power failure or voltage reduction, the control power supply is not affected by the main power supply loop, and the control loop is always electrified, so that the following defects are caused: firstly, after the main power supply voltage for fault removal is recovered, the load is automatically restarted without any operation, and a large number of loads are simultaneously self-started to pull down the bus voltage, so that the equipment trips, and the load self-starting fails; second, when the grid voltage is low, the primary circuit is still energized and may cause damage to the equipment.
Disclosure of Invention
In order to solve the problems, the utility model provides the control circuit for the UPS power supply of the low-voltage cabinet of the safe fused salt energy storage system, which effectively avoids the automatic starting of equipment after the power supply is recovered after the main power supply is powered off.
In order to achieve the purpose, the control circuit of the UPS power supply of the molten salt energy storage system comprises a low-voltage cabinet, a low-voltage main power supply, the UPS power supply and a control circuit, wherein the UPS power supply is electrically connected with the low-voltage cabinet through the control circuit, and the control circuit is arranged to disconnect the connection with the low-voltage cabinet when the voltage of the low-voltage main power supply is lower than a preset voltage.
The low-voltage main power supply is characterized by further comprising a monitoring circuit for monitoring the voltage of the low-voltage main power supply, wherein the monitoring circuit is connected between the low-voltage main power supply and the control circuit, and when the voltage of the low-voltage main power supply is lower than a preset voltage, the control circuit is disconnected from the low-voltage cabinet.
The monitoring circuit comprises a first relay and a second relay, wherein the first relay and the second relay are respectively connected with an AB phase and a BC phase of a low-voltage main power supply to monitor the interphase voltage of the low-voltage main power supply, and the control circuit is disconnected from the low-voltage cabinet when the voltage of the low-voltage main power supply is lower than a preset voltage.
In a further scheme, the first relay and the second relay set the action value to be 70% of rated voltage.
The voltage transformer is connected between the low-voltage main power supply and the monitoring circuit and is used for providing secondary voltage for the first relay and the second relay.
The control circuit comprises a trigger, the trigger is provided with an auxiliary contact and a normally-closed contact, the first relay is provided with a first normally-closed terminal and a first coil used for controlling the first normally-closed terminal to be opened or closed, the second relay is provided with a second normally-closed terminal and a second coil used for controlling the second normally-closed terminal to be opened or closed, the first coil and the second coil are connected in series into a UPS power supply in parallel, the first normally-closed terminal and the second normally-closed terminal are connected in parallel and then are connected with the auxiliary contact, the normally-closed contact is electrically connected with a low-voltage cabinet, and when the first relay and the second relay monitor that the voltage of a low-voltage main power supply is lower than a preset voltage, the first normally-closed terminal and the second normally-closed terminal are controlled to be opened so as to disconnect the normally-closed contact from the low-voltage cabinet.
The further scheme is that the two triggers are arranged, and auxiliary contacts of the two triggers are connected in parallel and then connected with a parallel point of the first normally-closed terminal and the second normally-closed terminal.
The further scheme is that the UPS power supply further comprises a fuse, wherein the fuse is connected between the UPS power supply output end and a parallel point of the first normally-closed terminal and the second normally-closed terminal.
Further, a miniature circuit breaker is connected between the UPS power supply and the control circuit.
The control circuit of the UPS power supply of the molten salt energy storage system, which is designed by the utility model, can effectively avoid the automatic starting of equipment after the main power supply is powered off and the power supply is restored, and ensures the operation safety.
Drawings
FIG. 1 is a connection diagram of control circuit elements of embodiment 1 of the present utility model;
fig. 2 is a diagram showing connection of monitoring circuit elements in embodiment 1 of the present utility model.
Wherein: the low-voltage cabinet 1, the low-voltage main power supply 2, the UPS power supply 3, the control circuit 4, the monitoring circuit 5, the first relay 51, the first normally-closed terminal 511, the first coil 512, the second relay 52, the second normally-closed terminal 521, the second coil 522, the voltage transformer 6, the trigger 7, the auxiliary contact 71, the normally-closed contact 72, the fuse 8 and the miniature circuit breaker 9.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Example 1
As shown in fig. 1, the control circuit of the UPS power source of the molten salt energy storage system described in this embodiment includes a low-voltage cabinet 1, a low-voltage main power source 2, a UPS power source 3 and a control circuit 4, where the UPS power source 3 is electrically connected with the low-voltage cabinet 1 through the control circuit 4, and the control circuit 4 is configured to disconnect from the low-voltage cabinet 1 when the voltage of the low-voltage main power source 2 is lower than a preset voltage. When the power grid is powered off or the voltage is low during operation, the loop of the control circuit 4 is automatically cut off, so that the connection between the UPS power supply 3 and the low-voltage cabinet 1 is disconnected, the automatic starting of load-end equipment is prevented after the main power supply is powered on again, and the equipment is further protected from being damaged due to the fact that the power is still electrified when the power grid voltage is low.
In some embodiments of the present utility model, a monitoring circuit 5 for monitoring the voltage of the low-voltage main power supply 2 is further included, the monitoring circuit 5 is connected between the low-voltage main power supply 2 and the control circuit 4, and when the voltage of the low-voltage main power supply 2 is lower than a preset voltage, the control circuit 4 is disconnected from the low-voltage cabinet 1. The monitoring circuit 5 is used for monitoring the voltage of the low voltage main power supply 2.
In some embodiments of the present utility model, the monitoring circuit 5 includes a first relay 51 and a second relay 52, where the first relay 51 and the second relay 52 are respectively connected to the AB phase and the BC phase of the low-voltage main power supply 2 to monitor the inter-phase voltage of the low-voltage main power supply 2, and disconnect the control circuit 4 from the low-voltage cabinet 1 when the voltage of the low-voltage main power supply 2 is lower than a preset voltage. As shown in fig. 2, the first relay 51 is connected to the a-phase and the B-phase of the low-voltage main power supply 2 through the com terminal and the v3 terminal thereof, respectively, and the second relay 51 is connected to the C-phase and the B-phase of the low-voltage main power supply 2 through the com terminal and the v3 terminal thereof, respectively, to monitor the voltage of the low-voltage main power supply 2.
In some embodiments of the present utility model, the first relay 51 and the second relay 52 set the operation value to 70% of the rated voltage. When the voltage of the low-voltage main power supply 2 is lower than 70% of the setting values of the first relay 51 and the second relay 52, the control power supply is immediately cut off, and the equipment is protected from damage caused by undershooting of the power grid voltage or low-voltage still being electrified.
In some embodiments of the present utility model, a voltage transformer 6 is connected between the low-voltage main power supply 2 and the monitoring circuit 5, and the voltage transformer 6 is used to provide secondary voltages to the first relay 51 and the second relay 52.
In some embodiments of the present utility model, as shown in fig. 2, the control circuit 4 includes a trigger 7, the trigger 7 has an auxiliary contact 71 and a normally closed contact 72, the first relay 51 has a first normally closed terminal 511 and a first coil 512 for controlling the first normally closed terminal 511 to be opened or closed, the second relay 52 has a second normally closed terminal 521 and a second coil 522 for controlling the second normally closed terminal 521 to be opened or closed, the first coil 512 and the second coil 522 are connected in parallel and connected to the UPS power source 3, the first normally closed terminal 511 and the second normally closed terminal 521 are connected in parallel and then connected to the auxiliary contact 71, the normally closed contact 72 is electrically connected to the low-voltage cabinet 1, and when the first relay 51 and the second relay 52 simultaneously monitor that the voltage of the low-voltage main power source 2 is lower than a preset voltage, the first normally closed terminal 511 and the second normally closed terminal 521 are controlled to be opened to disconnect the normally closed contact 72 from the low-voltage cabinet 1. In this way, when the first coil 512 and the second coil 522 are electrified to keep the first normally-closed terminal 511 and the second normally-closed terminal 521 in a closed state, when the first relay 51 and the second relay 52 monitor that the voltage of the low-voltage main power supply 2 is lower than the preset voltage at the same time, the first normally-closed terminal 511 and the second normally-closed terminal 521 are controlled to be disconnected, the auxiliary contact 71 of the trigger 7 loses electricity to disconnect the normally-closed contact 72 from the low-voltage cabinet 1, the circuit of the control circuit 4 is automatically disconnected when the low-voltage main power supply 2 loses electricity or the voltage is reduced, and the connection between the UPS power supply 3 and the low-voltage cabinet 1 is disconnected, so that the problems that a large amount of loads simultaneously self-start to pull down the bus voltage after the power supply voltage is recovered, equipment tripping is caused to damage the equipment and the like are solved.
In some embodiments of the present utility model, two triggers 7 are provided, and the auxiliary contacts 71 of the two triggers 7 are connected in parallel and then connected in parallel with the first normally-closed terminal 511 and the second normally-closed terminal 521. The two contactors 7 are connected in parallel and then are connected in series into the control circuit 4, so that the power failure of the control circuit caused by the failure of the single contactor 7 can be effectively avoided, and the reliability of the control circuit is ensured.
In some embodiments of the present utility model, a fuse 8 is further included, the fuse 8 being connected between the output of the UPS power source 3 and the point at which the first and second normally closed terminals 511 and 521 are connected in parallel.
In some embodiments of the present utility model, a miniature circuit breaker is connected between the UPS power source 3 and the control circuit 4.
The control circuit of the UPS power supply of the molten salt energy storage system, provided by the embodiment, is characterized in that the low-voltage cabinet 1 is mainly used for controlling the molten salt energy storage system, and the molten salt energy storage system is closed after the low-voltage cabinet 1 is powered off, so that the automatic starting of equipment can be effectively avoided after the main power supply is powered off and power supply is restored, and the operation safety is ensured.
In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (9)

1. The utility model provides a control circuit of fused salt energy storage system low-voltage cabinet UPS power, includes low-voltage cabinet (1), low-voltage main power supply (2), UPS power (3) and control circuit (4), characterized by, UPS power (3) are connected with low-voltage cabinet (1) electricity through control circuit (4), just control circuit (4) set up to work as disconnection and low-voltage cabinet (1) when low-voltage main power supply (2) voltage is less than the default voltage.
2. The control circuit of a molten salt energy storage system low-voltage cabinet UPS power supply according to claim 1, further comprising a monitoring circuit (5) for monitoring the voltage of the low-voltage main power supply (2), wherein the monitoring circuit (5) is connected between the low-voltage main power supply (2) and the control circuit (4) and disconnects the control circuit (4) from the low-voltage cabinet (1) when the voltage of the low-voltage main power supply (2) is lower than a preset voltage.
3. The control circuit of a molten salt energy storage system low-voltage cabinet UPS power supply according to claim 2, wherein the monitoring circuit (5) includes a first relay (51) and a second relay (52), the first relay (51) and the second relay (52) are respectively connected to an AB phase and a BC phase of the low-voltage main power supply (2) to monitor an inter-phase voltage of the low-voltage main power supply (2), and when the voltage of the low-voltage main power supply (2) is lower than a preset voltage, the control circuit (4) is disconnected from the low-voltage cabinet (1).
4. A control circuit for a molten salt energy storage system low-voltage cabinet UPS power supply according to claim 3, characterized in that the first relay (51) and the second relay (52) set the action value to 70% of rated voltage.
5. A control circuit of a molten salt energy storage system low-voltage cabinet UPS power supply according to claim 3, characterized in that a voltage transformer (6) is connected between the low-voltage main power supply (2) and the monitoring circuit (5), and the voltage transformer (6) is used for providing secondary voltages for the first relay (51) and the second relay (52).
6. The control circuit of a molten salt energy storage system low-voltage cabinet UPS power supply according to claim 4 or 5, characterized in that the control circuit (4) comprises a trigger (7), the trigger (7) has an auxiliary contact (71) and a normally closed contact (72), the first relay (51) has a first normally closed terminal (511) and a first coil (512) for controlling the opening or closing of the first normally closed terminal (511), the second relay (52) has a second normally closed terminal (521) and a second coil (522) for controlling the opening or closing of the second normally closed terminal (521), the first coil (512) and the second coil (522) are connected in parallel to the UPS power supply (3), the first normally closed terminal (511) and the second normally closed terminal (521) are connected in parallel to the auxiliary contact (71), the normally closed contact (72) is electrically connected to the low-voltage cabinet (1), and the first relay (51) and the second relay (52) simultaneously monitor that the low-voltage main power supply (2) is lower than a preset voltage, and the first normally closed terminal (511) and the second normally closed terminal (521) are disconnected to the low-voltage cabinet (72).
7. The control circuit of the molten salt energy storage system low-voltage cabinet UPS power supply according to claim 6, wherein two triggers (7) are arranged, and auxiliary contacts (71) of the two triggers (7) are connected in parallel and then connected with a parallel point of the first normally-closed terminal (511) and the second normally-closed terminal (521).
8. The control circuit of a molten salt energy storage system low-voltage cabinet UPS power supply according to claim 4, further comprising a fuse (8), wherein the fuse (8) is connected between the output end of the UPS power supply (3) and a parallel point of the first normally-closed terminal (511) and the second normally-closed terminal (521).
9. The control circuit of a molten salt energy storage system low-voltage cabinet UPS power supply according to claim 1, wherein a miniature circuit breaker (9) is connected between the UPS power supply (3) and the control circuit (4).
CN202320677447.7U 2023-03-31 2023-03-31 Control circuit of UPS (uninterrupted Power supply) of low-voltage cabinet of molten salt energy storage system Active CN219893014U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320677447.7U CN219893014U (en) 2023-03-31 2023-03-31 Control circuit of UPS (uninterrupted Power supply) of low-voltage cabinet of molten salt energy storage system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320677447.7U CN219893014U (en) 2023-03-31 2023-03-31 Control circuit of UPS (uninterrupted Power supply) of low-voltage cabinet of molten salt energy storage system

Publications (1)

Publication Number Publication Date
CN219893014U true CN219893014U (en) 2023-10-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320677447.7U Active CN219893014U (en) 2023-03-31 2023-03-31 Control circuit of UPS (uninterrupted Power supply) of low-voltage cabinet of molten salt energy storage system

Country Status (1)

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CN (1) CN219893014U (en)

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