DCS control cabinet power supply system

Abstract

The invention discloses a DCS (Distributed Control System) control cabinet power supply system, which belongs to the field of industrial control and comprises a circuit breaker QF01, a circuit breaker QF02, a circuit breaker QF11, a circuit breaker QF21, a circuit breaker QF22, a circuit breaker QF31, a circuit breaker QF32, a circuit breaker QF41, a dual-power switching device, a UPS (Uninterrupted Power Supply), a first 24V switching power supply, a second 24V switching power supply, a direct-current power supply redundancy module, a fuse and the like. According to the DCS control cabinet power supply system optimization method, compared with a traditional power supply system, reliability is higher, power supply is more stable, the power supply stability of the system is improved, safety and environmental protection risks are reduced, the DCS can operate normally for UPS faults, one-path alternating-current power supply faults and one-path direct-current power supply faults, and the risk of safe and stable operation of key equipment is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of industrial control technology, and more specifically to a power supply system for a DCS control cabinet. Background Technology

[0002] With the continuous development of science and technology, more and more high-tech information technologies are being widely applied in various industries and fields. Currently, DCS systems require 220V and 24V power supplies to power the system cabinets, external valves, and instruments. They are widely used in various industrial control fields, and the control field is gradually shifting towards automation and intelligence. To reduce the safety risks of control systems and improve the social and economic benefits of enterprises, the stability of DCS control systems is particularly important, especially in fields such as the production and storage of hazardous chemicals. However, abnormal or unreliable power supply to DCS systems can seriously affect production and cause major disasters for enterprises. Therefore, DCS systems need to be configured or designed with a reliable power supply system to ensure stable system operation and facilitate online inspection and maintenance.

[0003] Currently, key DCS systems, instruments, and equipment in production processes or safety and environmental protection procedures all use 24VDC or 220V power supply. Once the power supply fails, it will cause equipment shutdown, system shutdown, or safety and environmental accidents. In traditional DCS control systems, many DCS control system manufacturers design the system power supply so that all 220V power in the cabinet comes from a dual power switch or UPS. If any one of the dual power switch or UPS devices fails, the DCS system will be paralyzed. Secondly, the maintenance of dual power switch or UPS requires the system to be shut down, which seriously affects the normal production of enterprises and may even bring safety hazards or risks. Summary of the Invention

[0004] The main objective of this invention is to provide a DCS control cabinet power supply system. By using this invention, the normal operation of the DCS system can be guaranteed when one of the dual power supply switching devices or UPS devices fails. Secondly, when the dual power supply switching device or UPS is under maintenance, it can be handled without shutting down the system.

[0005] To achieve the above objectives, the present invention provides a DCS control cabinet power supply system, comprising: The first power supply circuit and the second power supply circuit each include a 220V power supply circuit and a 24V power supply circuit. The 220V power supply circuit is used to provide 220V AC power to the DCS control system, and the 24V power supply circuit is used to provide 24V DC power to the DCS control system. Under normal circumstances, the first power supply circuit provides 220V AC and 24V DC power to the DCS control system. When the first power supply circuit malfunctions or is under maintenance, the second power supply circuit can provide 220V AC and 24V DC power to the DCS control system.

[0006] As a further improvement of the present invention, the first circuit includes a factory section power supply, five circuit breakers QF01, QF11, QF21, QF31, and QF32, a dual power supply switching device, a UPS power supply, a first 24V switching power supply, a DC power supply redundancy module, and two power fuses A1 and A2. The factory section power supply is connected in series with circuit breaker QF01, dual power supply switching device, circuit breaker QF11, and UPS power supply. The output of the UPS power supply is connected in parallel to split into two paths. One path is connected in series with the UPS power supply, circuit breaker QF31, and power fuse A1 and connected to the 220V AC cabinet of the DCS control system. The other path is connected in series with the UPS power supply, circuit breaker QF21, first 24V switching power supply, DC power supply redundancy module, circuit breaker QF32, and power fuse A2 and connected to the 24V DC cabinet of the DCS control system.

[0007] As a further improvement of the present invention, the second circuit includes one set of factory second-stage power supply, two sets of circuit breakers QF22 and QF41, and one set of second 24V switching power supply. The factory second-stage power supply is connected in series with the DCS control system 220V AC cabinet via circuit breaker QF41 and power fuse A1. The factory second-stage power supply is connected in series with the DCS control system 24V DC cabinet via circuit breaker QF22, second 24V switching power supply, DC power redundancy module, circuit breaker QF32, and power fuse A2.

[0008] As a further improvement of the present invention, the factory's second-stage power supply is connected in series with a dual power switching device, a circuit breaker QF11, and a UPS power supply. The factory's second-stage power supply and the dual power switching device are also equipped with a circuit breaker QF02. The output of the UPS power supply is connected in parallel to split into two paths. One path is connected in series with the UPS power supply, circuit breaker QF31, power fuse A1, and the 220V AC cabinet of the DCS control system. The other path is connected in series with the UPS power supply, circuit breaker QF21, the first 24V switching power supply, the DC power redundant module, circuit breaker QF32, power fuse A2, and the 24V DC cabinet of the DCS control system.

[0009] The present invention discloses a method for operating a DCS control cabinet power supply system, comprising the following steps: S1: During normal production, the workflow and method for providing 220V AC and 24V DC power to the DCS control system through the first power supply circuit is as follows: The factory's power supply provides 220V AC and 24V DC power to the DCS control system. Circuit breaker QF41 is in the open state, and circuit breakers QF01, QF11, and QF31 are closed to provide redundant 220V AC power to the DCS control system. Circuit breakers QF01, QF11, QF21, and QF32 are closed, and circuit breakers QF02 and QF22 are closed to provide dual-circuit redundant 24V DC power to the DCS control system.

[0010] S2: When the first circuit fails, the second circuit provides 220V AC and 24V DC power to the DCS control system. The process and method are as follows: The factory's two-stage power supply provides 220V AC and 24V DC power to the DCS control system. Circuit breakers QF01, QF02, and QF31 are in the open state. Circuit breaker QF41 is closed to provide 220V AC power to the DCS control system. Circuit breakers QF22 and QF32 are closed to provide 24V DC power to the DCS control system.

[0011] When the dual power supply switching device, UPS power supply, or first 24V switching power supply in the first circuit fails and needs to be shut down for maintenance, this method can be used to provide 220V AC and 24V DC power to the DCS control system through the second circuit.

[0012] S3: When the factory's primary power supply fails, the workflow and method for the factory's secondary power supply to provide 220V AC and 24V DC power to the DCS control system are as follows: Circuit breakers QF01 and QF41 are in the open state; circuit breakers QF02, QF11, and QF31 are closed to provide 220V AC power to the DCS control system; and circuit breakers QF02, QF11, QF21, and QF32 are closed to provide 24V DC power to the DCS control system.

[0013] When the second 24V switching power supply in the second circuit fails or is under maintenance, this method can be used to provide 220V AC and 24V DC power to the DCS control system through the factory's two-stage power supply.

[0014] S4: When the first 24V switching power supply fails or is under maintenance in the first circuit fault, the workflow and method for the factory's first power supply to provide 220V AC power to the DCS control system and the factory's second power supply to provide 24V DC power to the DCS control system are as follows: The factory's first power supply provides 220V AC power to the DCS control system. Circuit breakers QF02 and QF41 are in the open state, while circuit breakers QF01, QF11, and QF31 are closed to provide 220V AC power to the DCS control system. Circuit breakers QF02 and QF21 are in the open state, while circuit breakers QF22 and QF32 are closed to provide 24V DC power to the DCS control system.

[0015] S5: When the first circuit fault interrupts circuit breaker QF31 or is under maintenance, the working process and method for the factory's second-stage power supply to provide 220V AC and 24V DC power to the DCS control system are as follows: Circuit breakers QF01, QF02, and QF31 are in the open state; circuit breaker QF41 is closed to provide 220V AC power to the DCS control system; and circuit breakers QF02, QF11, QF21, and QF32 are closed to provide 24V DC power to the DCS control system.

[0016] When the second 24V switching power supply in the second circuit fails or is under maintenance, this method can be used to provide 220V AC and 24V DC power to the DCS control system through the factory's two-stage power supply.

[0017] S6: When the first 24V switching power supply fails or is under maintenance in the first circuit fault, the working process and method of the factory's second power supply providing 220V AC and 24V DC power to the DCS control system is as follows: Circuit breaker QF01 and circuit breaker QF41 are in the open state, circuit breaker QF02, circuit breaker QF11, and circuit breaker QF31 are closed to provide 220V AC power to the DCS control system, circuit breaker QF21 is in the open state, and circuit breaker QF22 and circuit breaker QF32 are closed to provide 24V DC power to the DCS control system.

[0018] The beneficial effects of this invention are reflected in: 1. When either the first circuit or the second circuit fails or loses power, the entire DCS system can operate normally. The first circuit and the second circuit serve as hot backups for each other, ensuring the safety and reliability of the 220V power supply to the DCS system. At the same time, routine maintenance and repair of the system power supply circuit can be carried out without shutting down the system.

[0019] 2. When either the first or second 24V switching power supply circuit fails or loses power, the entire DCS system's 24V power supply can operate normally through the redundant switching power supply equipment, forming a hot backup for the first or second 24V switching power supply, ensuring the safety and reliability of the DCS system's 24V power supply. At the same time, routine maintenance and repair of the system's power supply circuit can be carried out without shutting down the system. Attached Figure Description

[0020] Figure 1 This is the circuit schematic diagram of the present invention; Detailed Implementation To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, of the embodiments of this invention. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] In one embodiment, see Figure 1 The present invention provides a DCS control cabinet power supply system, including a first power supply circuit and a second power supply circuit. The first power supply circuit and the second power supply circuit each include a 220V power supply circuit and a 24V power supply circuit, respectively. The 220V power supply circuit is used to provide 220V AC power to the DCS control system, and the 24V power supply circuit is used to provide 24V DC power to the DCS control system. Under normal circumstances, the first power supply circuit provides 220V AC and 24V DC power to the DCS control system. When the first power supply circuit malfunctions or is under maintenance, the second power supply circuit can provide 220V AC and 24V DC power to the DCS control system.

[0022] The first circuit includes a factory power supply, circuit breakers QF01, QF11, QF21, QF31, and QF32, a dual power switching device, a UPS power supply, a first 24V switching power supply, a DC power redundant module, and two power fuses A1 and A2. The factory power supply consists of circuit breaker QF01, dual power switching device, circuit breaker QF11, and UPS power supply connected in series. The UPS power supply output is split into two parallel paths: one path is connected in series with the 220V AC cabinet of the DCS control system via the UPS power supply, circuit breaker QF31, and power fuse A1; the other path is connected in series with the 24V DC cabinet of the DCS control system via the UPS power supply, circuit breaker QF21, first 24V switching power supply, DC power redundant module, circuit breaker QF32, and power fuse A2. The second circuit includes one set of factory second-stage power supply, two sets of circuit breakers QF22 and QF41, and one set of second 24V switching power supply. The factory second-stage power supply is connected in series with the 220V AC cabinet of the DCS control system via circuit breaker QF41 and power fuse A1. The factory second-stage power supply is connected in series with the 24V DC cabinet of the DCS control system via circuit breaker QF22, second 24V switching power supply, DC power redundancy module, circuit breaker QF32, and power fuse A2.

[0023] The factory's second-stage power supply is connected in series with a dual power switching device, circuit breaker QF11, and UPS power supply. The factory's second-stage power supply and dual power switching device are also equipped with circuit breaker QF02. The UPS power supply output is connected in parallel to split into two paths. One path is connected in series with the UPS power supply, circuit breaker QF31, power fuse A1, and the 220V AC cabinet of the DCS control system. The other path is connected in series with the UPS power supply, circuit breaker QF21, the first 24V switching power supply, the DC power redundant module, circuit breaker QF32, power fuse A2, and the 24V DC cabinet of the DCS control system.

[0024] The working method of the DCS control cabinet power supply system specifically includes the following process: S1: During normal production, the workflow and method for providing 220V AC and 24V DC power to the DCS control system through the first power supply circuit is as follows: The factory's power supply provides 220V AC and 24V DC power to the DCS control system. Circuit breaker QF41 is in the open state, and circuit breakers QF01, QF11, and QF31 are closed to provide redundant 220V AC power to the DCS control system. Circuit breakers QF01, QF11, QF21, QF32, QF02, and QF22 are closed to provide dual-circuit redundant 24V DC power to the DCS control system.

[0025] S2: When the first circuit fails, the second circuit provides 220V AC and 24V DC power to the DCS control system. The process and method are as follows: The factory's two-stage power supply provides 220V AC and 24V DC power to the DCS control system. Circuit breakers QF01, QF02, and QF31 are in the open state. Circuit breaker QF41 is closed to provide 220V AC power to the DCS control system. Circuit breakers QF22 and QF32 are closed to provide 24V DC power to the DCS control system.

[0026] When the dual power supply switching device, UPS power supply, or first 24V switching power supply in the first circuit fails and needs to be shut down for maintenance, this method can be used to provide 220V AC and 24V DC power to the DCS control system through the second circuit.

[0027] S3: When the factory's primary power supply fails, the workflow and method for the factory's secondary power supply to provide 220V AC and 24V DC power to the DCS control system are as follows: Circuit breakers QF01 and QF41 are in the open state; circuit breakers QF02, QF11, and QF31 are closed to provide 220V AC power to the DCS control system; and circuit breakers QF02, QF11, QF21, and QF32 are closed to provide 24V DC power to the DCS control system.

[0028] When the second 24V switching power supply in the second circuit fails or is under maintenance, this method can be used to provide 220V AC and 24V DC power to the DCS control system through the factory's two-stage power supply.

[0029] S4: When the first 24V switching power supply fails or is under maintenance in the first circuit fault, the workflow and method for the factory's first power supply to provide 220V AC power to the DCS control system and the factory's second power supply to provide 24V DC power to the DCS control system are as follows: The factory's first power supply provides 220V AC power to the DCS control system. Circuit breakers QF02 and QF41 are in the open state, while circuit breakers QF01, QF11, and QF31 are closed to provide 220V AC power to the DCS control system. Circuit breakers QF02 and QF21 are in the open state, while circuit breakers QF22 and QF32 are closed to provide 24V DC power to the DCS control system.

[0030] S5: When the first circuit fault interrupts circuit breaker QF31 or is under maintenance, the working process and method for the factory's second-stage power supply to provide 220V AC and 24V DC power to the DCS control system are as follows: Circuit breakers QF01, QF02, and QF31 are in the open state; circuit breaker QF41 is closed to provide 220V AC power to the DCS control system; and circuit breakers QF02, QF11, QF21, and QF32 are closed to provide 24V DC power to the DCS control system.

[0031] When the second 24V switching power supply in the second circuit fails or is under maintenance, this method can be used to provide 220V AC and 24V DC power to the DCS control system through the factory's two-stage power supply.

[0032] S6: When the first 24V switching power supply fails or is under maintenance in the first circuit fault, the working process and method of the factory's second power supply providing 220V AC and 24V DC power to the DCS control system is as follows: Circuit breaker QF01 and circuit breaker QF41 are in the open state, circuit breaker QF02, circuit breaker QF11, and circuit breaker QF31 are closed to provide 220V AC power to the DCS control system, circuit breaker QF21 is in the open state, and circuit breaker QF22 and circuit breaker QF32 are closed to provide 24V DC power to the DCS control system.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A DCS control cabinet power supply system, characterized by The application relates to a DCS control cabinet power supply system. The first power supply circuit is used for providing 220V alternating current and 24V direct current for the DCS control system under normal conditions, and the second power supply circuit can provide 220V alternating current and 24V direct current for the DCS control system when the first power supply circuit is abnormal or is under maintenance. The first circuit comprises one set of factory first-stage power supply, five sets of circuit breakers QF01, QF11, QF21, QF31 and QF32, one set of double power supply switching device, one set of UPS power supply, one set of first 24V switching power supply, one set of direct current power supply redundancy module, two sets of power supply fuses A1 and A2, and the factory first-stage power supply is connected in series with the circuit breakers QF01, the double power supply switching device, the circuit breakers QF11 and the UPS power supply in sequence; the output end of the UPS power supply is connected in parallel and branched into two paths, one path is connected in series with the DCS control system 220V alternating current cabinet through the UPS power supply, the circuit breaker QF31, the power supply fuse A1 and the other path is connected in series with the DCS control system 24V direct current cabinet through the UPS power supply, the circuit breaker QF21, the first 24V switching power supply, the direct current power supply redundancy module, the circuit breaker QF32 and the power supply fuse A2 in sequence.

2. A DCS control cabinet power supply system according to claim 1, characterized in that: The second circuit comprises one set of factory second-stage power supply, two sets of circuit breakers QF22 and QF41, one set of second 24V switching power supply, the factory second-stage power supply is connected in series with the DCS control system 220V alternating current cabinet through the circuit breakers QF41 and the power supply fuse A1, and the factory second-stage power supply is connected in series with the DCS control system 24V direct current cabinet through the circuit breakers QF22, the second 24V switching power supply, the direct current power supply redundancy module, the circuit breaker QF32 and the power supply fuse A2.

3. A DCS control cabinet power supply system according to claim 2, characterized in that: The factory second-stage power supply is connected in series with the double power supply switching device, the circuit breaker QF11 and the UPS power supply in sequence, the factory second-stage power supply and the double power supply switching device are further provided with the circuit breaker QF02, the output end of the UPS power supply is connected in parallel and branched into two paths, one path is connected in series with the DCS control system 220V alternating current cabinet through the UPS power supply, the circuit breaker QF31 and the power supply fuse A1, and the other path is connected in series with the DCS control system 24V direct current cabinet through the UPS power supply, the circuit breaker QF21, the first 24V switching power supply, the direct current power supply redundancy module, the circuit breaker QF32 and the power supply fuse A2.

4. A DCS control cabinet power supply system according to claim 3, characterized in that:

5. The working method of the DCS control cabinet power supply system according to any one of claims 1-6, comprising the following steps: ​ S1: normal production, the first power supply circuit for DCS control system to provide 220V AC and 24V DC power supply process and method: the first power supply for DCS control system to provide 220V AC and 24V DC, circuit breaker QF41 is in the open state, circuit breaker QF01, circuit breaker QF11, circuit breaker QF31 closed for DCS control system to provide redundant 220V AC, circuit breaker QF01, circuit breaker QF11, circuit breaker QF21, circuit breaker QF32 closed, circuit breaker QF02, circuit breaker QF22 closed for DCS control system to provide dual redundant 24V DC power. S2: when the first loop fault or maintenance of a circuit, the second loop for DCS control system to provide 220V AC and 24V DC power supply process and method: the second power supply for DCS control system to provide 220V AC and 24V DC, circuit breaker QF01, circuit breaker QF02, circuit breaker QF31 is in the open state, circuit breaker QF41 closed for DCS control system to provide 220V AC, circuit breaker QF22, circuit breaker QF32 closed for DCS control system to provide 24V DC power. When the first loop double power supply switching device or UPS power or the first 24V switch power supply fault, need to stop maintenance, using this way can through the second loop for DCS control system to provide 220V AC and 24V DC power supply. S3: when the first power supply fault, the second power supply for DCS control system to provide 220V AC and 24V DC power supply process and method: circuit breaker QF01, circuit breaker QF41 is in the open state, circuit breaker QF02, circuit breaker QF11, circuit breaker QF31 closed for DCS control system to provide 220V AC, circuit breaker QF02, circuit breaker QF11, circuit breaker QF21, circuit breaker QF22, circuit breaker QF32 closed for DCS control system to provide 24V DC power. When the second loop second 24V switch power supply fault or maintenance, using this way can through the second power supply for DCS control system to provide 220V AC and 24V DC power supply. S4: when the first loop fault in the first 24V switch power supply fault or maintenance, the first power supply for DCS control system to provide 220V AC, the second power supply for DCS control system to provide 24V DC power supply process and method: the first power supply for DCS control system to provide 220V AC, circuit breaker QF02, circuit breaker QF41 is in the open state, circuit breaker QF01, circuit breaker QF11, circuit breaker QF31 closed for DCS control system to provide 220V AC, circuit breaker QF02, circuit breaker QF21 is in the open state, circuit breaker QF22, circuit breaker QF32 closed for DCS control system to provide 24V DC power. S5: When the first circuit fault interrupter QF31 fails or is under maintenance, the factory second power supply provides 220V AC and 24V DC power to the DCS control system. The working process and method are as follows: the circuit breaker QF01, the circuit breaker QF02, and the circuit breaker QF31 are in an open state, the circuit breaker QF41 is closed to provide 220V AC power to the DCS control system, and the circuit breaker QF02, the circuit breaker QF11, the circuit breaker QF21, and the circuit breaker QF32 are closed to provide 24V DC power to the DCS control system. When the second 24V switching power supply in the second circuit fails or is under maintenance, this mode can provide 220V AC and 24V DC power to the DCS control system through the factory second power supply. S6: When the first 24V switching power supply in the first circuit fails or is under maintenance, the factory second power supply provides 220V AC and 24V DC power to the DCS control system. The working process and method are as follows: the circuit breaker QF01 and the circuit breaker QF41 are in an open state, the circuit breaker QF02, the circuit breaker QF11, and the circuit breaker QF31 are closed to provide 220V AC power to the DCS control system, the circuit breaker QF21 is in an open state, and the circuit breaker QF22 and the circuit breaker QF32 are closed to provide 24V DC power to the DCS control system.

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