Safety circuit of electrolytic aluminum rectifier unit control system power supply

Abstract

The utility model discloses a safety circuit of an electrolytic aluminum rectifier unit control system power supply, which comprises a switching circuit and a static switch module, the switching circuit comprises a first section of power supply and a second section of power supply, the first section of power supply is connected with an alternating current power supply I, and the second section of power supply is connected with an alternating current power supply II. The first section of power supply is connected to a static switch I, the second section of power supply is connected to a static switch II, the static switch I and the static switch II form a static switch module I, and the first section of power supply and the second section of power supply are connected to a plurality of output wiring terminals through the static power supply module. The utility model provides a safety circuit of an electrolytic aluminum rectifier unit control system power supply, in a first section power supply loop and a second section power supply loop, a static switch module undisturbed switching system is combined to realize the safety circuit of the control system power supply, an operation section power supply can be effectively switched to a maintenance state through a static switch, and the other section power supply can be automatically switched. And the rectifier unit control device is ensured to be uninterruptible.

Description

Technical Field

[0001] This utility model relates to the field of power cabinet safety circuit technology, specifically a safety circuit for the power supply of an electrolytic aluminum rectifier unit control system. Background Technology

[0002] The control power supply of the electrolytic aluminum rectifier unit is a core component of the rectifier unit power supply system, mainly providing uninterrupted power supply during the electrolytic aluminum production process and in case of power interruption or abnormality.

[0003] Traditional electrolytic aluminum rectifier control power supplies mostly use a dual-power control cabinet with segmented power supply. When the electrolytic aluminum system is in operation, there is a risk of power loss in the control power supply during the process of shutting down the dual power supply for maintenance. It is impossible to effectively isolate and shut down a single power supply independently, which causes great difficulties for maintenance personnel.

[0004] The existing power cabinet maintains its continuous operating status mainly by automatically switching between two power switches using an ATS static switch, thereby ensuring continuous power supply and circuit safety. However, when the backup power supply provides stored energy to the main power supply, it will be in a standby state for a long time, which may affect the normal operation of the power cabinet if the backup power supply fails.

[0005] Meanwhile, if the control power supply is interrupted or malfunctions during operation, it will cause the rectifier unit's current stabilization control system to lose power, and the main and branch current commands will be lost, resulting in the paralysis of the electrolytic aluminum rectifier power supply system.

[0006] To address this, this utility model provides a safety circuit for the power supply of the control system of an electrolytic aluminum rectifier unit. In the first and second power supply circuits, a static switch module with a disturbance-free switching system is combined to realize the safety circuit of the control system power supply, effectively ensuring the disturbance-free switching operation of the dual power supply during operation. When a power supply section is under maintenance, the operating power supply can be effectively switched to the maintenance state through the static switch, realizing the condition of power outage maintenance for any power cabinet in the first and second sections. At the same time, when a power supply in one of the two sections fails, the other power supply can be automatically switched to ensure that the rectifier unit control device is not powered off. Utility Model Content

[0007] This utility model patent provides a safety circuit for the power supply of the electrolytic aluminum rectifier unit control system. Its main purpose is to improve the continuity and stability of the rectifier power supply system during electrolytic aluminum production, ensuring uninterrupted power supply, stable voltage output, and strong adaptability to the rectifier unit control system. It also mitigates rectifier unit control system failures caused by power outages. This safety circuit is applicable to electrolytic aluminum production lines of different scales and types, exhibiting high adaptability and flexibility.

[0008] By configuring a switching circuit with the same first and second power supply on the power supply side, circuit breaker IV and circuit breaker IV' each serve as the first and second power outputs. After passing through the static switch module I switching system, the system automatically switches to the other power supply output after the failure of one power supply. Static switch modules are installed on both the first and second power supplies. Existing technology can directly use static switch modules as non-disruptive static switching switches, creating a power supply two-to-one automatic switching system with a millisecond-level switching rate. No short-term power failure occurs during the switching process between the two power supplies via the static switch module. The static switch module mainly consists of an intelligent control board and a high-speed... Composed of thyristors and circuit breakers, it can achieve rapid circuit switching control and cut off the circuit in case of overload, short circuit and other faults to protect the system and load safety. The first and second power supplies are both in the form of two branch circuits, with independent static switch modules on the static switch module and a common static switch module at the current output terminal. This allows the first and second power supplies to always be in the internal circuit switchable state, keeping their own circuits in a continuous state, and enabling the first and second power supplies to compensate for each other to perform backup functions. This allows staff to save a lot of time for maintenance and ensures that the power cabinet works stably and continuously.

[0009] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0010] A safety circuit for the power supply of an electrolytic aluminum rectifier unit control system includes a switching circuit and a static switch module;

[0011] The switching circuit includes a first power supply and a second power supply. The first power supply is connected to AC power supply I, and the second power supply is connected to AC power supply II. The first power supply is connected to static switch I, and the second power supply is connected to static switch II. The static switch I and static switch II form a static switch module I. The first power supply and the second power supply are connected to multiple output terminals through the static power supply module.

[0012] Furthermore, the AC power supply I is connected to branch circuit I and branch circuit II. Branch circuit I is connected to static switch III, and branch circuit II is connected to static switch IV. Static switch III and static switch IV together form static switch module II.

[0013] Furthermore, the AC power supply II is connected to branch circuit I' and branch circuit II', branch circuit I' is connected to static switch III', branch circuit II' is connected to static switch IV', and static switch III' and static switch IV' form static switch module III.

[0014] Furthermore, a circuit breaker I is connected to the branch circuit I, a rectifier I is connected to the output terminal of the circuit breaker I, an inverter I is connected to the output terminal of the rectifier I, an isolation transformer I is connected to the output terminal of the inverter I, and the output terminal of the isolation transformer I is connected to the input terminal of the static switch III. The rectifier I, the inverter I, and the static switch module II constitute a static switching system.

[0015] Furthermore, a circuit breaker I' is connected to the branch circuit I', a rectifier I' is connected to the output terminal of the circuit breaker I', an inverter I' is connected to the output terminal of the rectifier I', an isolation transformer I' is connected to the output terminal of the inverter I', and the output terminal of the isolation transformer I' is connected to the input terminal of the static switch III'. The rectifier I', the inverter I', and the static switch module II' constitute a static switching system.

[0016] Furthermore, a circuit breaker III is connected to the branch circuit II, and the output terminal of the circuit breaker III is connected to the input terminal of the static switch IV.

[0017] Furthermore, a circuit breaker III' is connected to the branch circuit II', and the output terminal of the circuit breaker III' is connected to the input terminal of the static switch IV'.

[0018] Furthermore, the first power supply also includes a battery connected to circuit breaker II, which is connected to the input terminal of inverter I.

[0019] Furthermore, the second power supply also includes a battery connected to circuit breaker II', which is connected to the input terminal of inverter I'.

[0020] Furthermore, the output terminal of the static switch module II is connected to the circuit breaker IV, and the output terminal of the static switch module III is connected to the circuit breaker IV'. Attached Figure Description

[0021] Figure Descriptions: 1-First power supply, 2-Second power supply, 3-AC power supply I, 4-AC power supply II, 5-Static switch I, 6-Static switch II, 7-Static switch module I, 8-Output terminal block, 9-Branch circuit I, 10-Branch circuit II, 11-Static switch III, 12-Static switch IV, 13-Static switch module II, 14-Branch circuit I', 15-Branch circuit II', 16-Static switch III', 17-Static switch... 18-Static switch module III, 19-Circuit breaker I, 20-Rectifier I, 21-Inverter I, 22-Isolation transformer I, 23-Circuit breaker I', 24-Rectifier I', 25-Inverter I', 26-Isolation transformer I', 27-Battery I, 28-Battery I', 29-Circuit breaker II, 30-Circuit breaker II', 31-Circuit breaker III, 32-Circuit breaker III', 33-Circuit breaker IV, 34-Circuit breaker IV';

[0022] Figure 1 This utility model includes a circuit diagram of a first power supply and a second power supply. Detailed Implementation

[0023] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0024] Example 1:

[0025] A safety circuit for the power supply of an electrolytic aluminum rectifier unit control system includes a switching circuit and a static switch module;

[0026] The switching circuit includes a first power supply and a second power supply. The first power supply is connected to AC power supply I, and the second power supply is connected to AC power supply II. The first power supply is connected to static switch I, and the second power supply is connected to static switch II. Static switch I and static switch II form static switch module I. The first power supply and the second power supply are connected to multiple output terminals through the static power supply module.

[0027] AC power supply I is connected to branch circuit I and branch circuit II. Branch circuit I is connected to static switch III, and branch circuit II is connected to static switch IV. Static switches III and IV together form static switch module II. Circuit breaker I is connected to branch circuit I. The output of circuit breaker I is connected to rectifier I. The output of rectifier I is connected to inverter I. The output of inverter I is connected to isolation transformer I. The output of isolation transformer I is connected to the input of static switch III. Rectifier I, inverter I, and static switch module II together form a static switching system. Circuit breaker III is connected to branch circuit II. The output terminal of circuit breaker III is connected to the input terminal of static switch IV. The first power supply 1 and the second power supply 2 output current through static switch module II 13 and static switch module III 18, respectively. A third static switch module I 7 is configured to connect multiple terminals. Multiple load output busbars are led out and terminalbars are set out to allow for the connection of extended loads. Rectifier I 20, inverter I 21 and static switch module II 13 form a static switching system. The static transfer switch adopts the switching method of first disconnecting and then connecting, which can realize uninterrupted switching between different input power supplies and provide dual bus power supply for single power loads.

[0028] AC power supply II is connected to branch circuit I' and branch circuit II'. Branch circuit I' is connected to static switch III', and branch circuit II' is connected to static switch IV'. Static switches III' and IV' together form static switch module III. Circuit breaker I' is connected to branch circuit I'. The output of circuit breaker I' is connected to rectifier I'. The output of rectifier I' is connected to inverter I'. The output of inverter I' is connected to isolation transformer I'. The output of isolation transformer I' is connected to the input of static switch III'. Rectifier I', inverter I', and static switch module II' together form a static switching system. Branch circuit II' is connected to circuit breaker III'. The output of circuit breaker III' is connected to the input of static switch IV'.

[0029] The first power supply also includes a battery, which is connected to circuit breaker II, and circuit breaker II is connected to the input terminal of inverter I.

[0030] The second power supply also includes a battery, which is connected to circuit breaker II', and circuit breaker II' is connected to the input terminal of inverter I'.

[0031] The output terminal of static switch module II is connected to circuit breaker IV, and the output terminal of static switch module III is connected to circuit breaker IV'.

[0032] This embodiment describes the specific structure of a safety circuit for the power supply of an electrolytic aluminum rectifier unit control system, wherein, as shown... Figure 1As shown, the first power supply 1 and the second power supply 2 output current through static switch module II 13 and static switch module III 18 respectively, and are configured with a third static switch module I 7 to connect multiple terminals. Multiple load output busbars are led out and terminal blocks are set out, which can be used to expand load connection. Rectifier I 20, inverter I 21 and static switch module II 13 form a static switching system. The static transfer switch adopts the switching method of disconnecting before connecting, which can realize uninterrupted switching between different input power supplies and provide dual bus power supply for single power loads, such as: n+1 redundancy of non-parallel UPS system, n+1 redundancy of UPS system with different capacity, n+1 redundancy of UPS system with different model, redundancy of different mains power, redundancy of mains power and generator, thereby ensuring that either the first power supply 1 and the second power supply 2 are in a connected state.

[0033] Meanwhile, the AC power supplies on the first power supply 1 and the second power supply 2 are connected to a static switch module through two branch circuits. When any branch circuit of the first power supply 1 and the second power supply 2 fails, the static switch module can be used to ensure that the circuit on the first power supply 1 or the second power supply 2 is connected by the characteristic of disconnecting first and then connecting.

[0034] Secondly, in order to ensure that the multiple wiring terminals on the power cabinet are independent of each other, such as Figure 1 As shown, both the first power supply 1 and the second power supply 2 are configured with static switch modules to independently connect to multiple terminals. The multiple terminals are connected in parallel, so when a single terminal fails, it will not affect the use of the remaining terminals.

[0035] Furthermore, in order to convert the input AC power into DC power for use by the power supply cabinet, such as... Figure 1 As shown,

[0036] A branch circuit on the first power supply 1 and the second power supply is connected to a rectifier via the first circuit breaker QF1. The output of the rectifier is connected to an inverter, and the output of the inverter is connected to an isolation transformer. The output of the isolation transformer is connected to the input of the static switching module. The rectifier converts the input AC power into DC power, and then the inverter converts the DC power into AC power with adjustable frequency, which is then output to the isolation transformer. This allows the isolation transformer to transfer current to the static switching module that is connected to both the first power supply 1 and the second power supply 2.

[0037] like Figure 1 As shown, a branch circuit on the first power supply 1 and the second power supply 2 is connected to the input terminal of the static switch module through circuit breaker III 31, and the output terminal of the static switch module on the first power supply 1 or the second power supply 2 is connected to circuit breaker IV 33.

[0038] By adopting the above technical solution:

[0039] The above design involves setting up a switching circuit with the same first power supply 1 and second power supply 2 in the power cabinet, and setting static switch modules on the first power supply 1 and the second power supply 2. The first power supply 1 and the second power supply 2 are each configured with static switch modules on the static switch modules in the form of two branch currents, and the static switch modules are configured together at the current output terminals. The AC current input to the first power supply 1 or the second power supply 2 is converted into DC current by the rectifier through the branch current, and the DC current is converted into AC current with adjustable frequency by the inverter. Finally, the isolation transformer transfers the current to the static switch module that is connected to the first power supply 1 and the second power supply 2, so that the static switch module delivers the current to the terminal block.

[0040] During this process, both the first power supply 1 and the second power supply 2 utilize static switch modules and branch circuits to ensure that the first power supply 1 and the second power supply 2 are always switchable within their internal circuits, maintaining their own circuits in a continuous state. When either the first power supply 1 or the second power supply 2 experiences a complete failure, the other can use the static switch module that is connected to both the first power supply 1 and the second power supply 2 to perform a backup function, which provides ample time for maintenance personnel and ensures the stable and continuous operation of the power cabinet.

[0041] Example 2:

[0042] Based on Example 1, this example describes the specific structure of the first power supply 1 and the second power supply 2, as follows: Figure 1 As shown, the first power supply 1 and the second power supply 2 also include a storage battery. The battery is connected to the system power supply by a circuit breaker II 29, which is used for the battery power isolation function during power supply operation. The end of the battery that meets the maintenance and charging / discharging functions during system operation is connected to the circuit breaker II 29.

[0043] In this process, by connecting the output terminal of circuit breaker II29 to the input terminal of the inverter, when the battery inputs current to the inverter, the inverter converts the DC power into AC power with adjustable frequency. Finally, the isolation transformer transfers the current to the static switch module that is connected to both the first power supply 1 and the second power supply 2, and the static switch module then delivers the current to the terminal block.

[0044] By adopting the above technical solution:

[0045] The above design connects a battery between the rectifier and the inverter. When the battery inputs current to the inverter, the inverter converts the DC power into AC power with an adjustable frequency. Finally, the isolation transformer transfers the current to the static switching module that is connected to both the first power supply 1 and the second power supply 2. This facilitates the provision of backup power to either the first power supply 1 or the second power supply 2 when the AC power input to the first power supply 1 or the second power supply 2 fails, thus ensuring that the power cabinet remains in operation.

Claims

1. A safety circuit for a power supply of a control system of an aluminum electrolysis rectifier set, characterized in that, The switching circuit and the static switch module are included; The switching circuit includes a first section power supply (1) and a second section power supply (2), the first section power supply (1) is connected with an alternating current power supply I (3), the second section power supply (2) is connected with an alternating current power supply II (4), the first section power supply (1) is connected with a static switch I (5), the second section power supply (2) is connected with a static switch II (6), the static switch I (5) and the static switch II (6) form a static switch module I (7), and the first section power supply (1) and the second section power supply (2) are connected with a plurality of output terminals (8) through the static switch module.

2. A safety circuit for a power supply of a control system of an electrolytic aluminium rectifier set according to claim 1, characterized in that, The alternating current power supply I (3) is connected with a branch circuit I (9) and a branch circuit II (10), the branch circuit I (9) is connected with a static switch III (11), the branch circuit II (10) is connected with a static switch IV (12), and the static switch III (11) and the static switch IV (12) form a static switch module II (13).

3. A safety circuit for a power supply of a control system of an electrolytic aluminium rectifier set according to claim 2, characterized in that, The alternating current power supply II (4) is connected with a branch circuit I' (14) and a branch circuit II' (15), the branch circuit I' (14) is connected with a static switch III' (16), the branch circuit II' (15) is connected with a static switch IV' (17), and the static switch III' (16) and the static switch IV' (17) form a static switch module III (18).

4. The safety circuit of the power supply of the control system of the electrolytic aluminum commutator set according to claim 3, characterized in that, The branch circuit I (9) is connected with a circuit breaker I (19), an output terminal of the circuit breaker I (19) is connected with a rectifier I (20), an output terminal of the rectifier I (20) is connected with an inverter I (21), an output terminal of the inverter I (21) is connected with an isolation transformer I (22), and the output terminal of the isolation transformer I (22) is connected with an input terminal of the static switch III (11), the rectifier I (20), the inverter I (21) and the static switch module II (13) form a static switching system.

5. A safety circuit for a power supply of a control system of an aluminum electrolysis rectifier set according to claim 4, characterized in that, The branch circuit I' (14) is connected with a circuit breaker I' (23), an output terminal of the circuit breaker I' (23) is connected with a rectifier I' (24), an output terminal of the rectifier I (20) is connected with an inverter I' (25), an output terminal of the inverter I' (25) is connected with an isolation transformer I' (26), and the output terminal of the isolation transformer I' (26) is connected with an input terminal of the static switch III' (16), the rectifier I' (24), the inverter I' (25) and the static switch module II (13) form a static switching system.

6. A safety circuit for a power supply of a control system of an aluminum electrolysis rectifier set according to claim 5, characterized in that, The branch circuit II (10) is connected with a circuit breaker III (31), and an output terminal of the circuit breaker III (31) is connected with an input terminal of the static switch IV (12).

7. A safety circuit for a power supply of a control system of an aluminum electrolysis rectifier set according to claim 6, characterized in that, The branch circuit II' (15) is connected with a circuit breaker III' (32), and an output terminal of the circuit breaker III' (32) is connected with an input terminal of the static switch IV' (17).

8. A safety circuit for a power supply of a control system of an electrolytic aluminium rectifier set according to claim 7, characterized in that, The first section power supply (1) further includes a storage battery I (27), the storage battery is connected with a circuit breaker II (29), and the circuit breaker II (29) is connected with an input terminal of the inverter I (21).

9. A safety circuit for a power supply of a control system of an electrolytic aluminium rectifier set according to claim 7, characterized in that, The second section power supply (2) further comprises a battery I' (28), the battery is connected to a breaker II' (30), the breaker II' (30) is connected to the input end of the inverter I' (25).

10. A safety circuit for a power supply of a control system of an electrolytic aluminium rectifier set according to claim 7, characterized in that, The output end of the static switch module II (13) is connected to a breaker IV (33), and the output end of the static switch module III (18) is connected to a breaker IV' (34).

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