DC isolator of power station

Abstract

The invention discloses a DC isolator of a power station. The isolator comprises an isolating diode and an isolation module, the isolation module employs a switching power supply module with a pulse transformer, the switching power supply module is connected with a first DC 220V power output line of the power station in series and outputs a DC 220V voltage, and the output end of the isolation module and a second DC 220V power output line are connected in parallel via unidirectional isolating diodes respectively. The switching power supply with the pulse transformer serves as the isolation module, so that the independence of the two DC power systems of the power station is not influenced, electrical isolation between the DC power systems is realized, and the two DC power supplies supply power to important load equipment at the same time to greatly improve the power supply performance and reliability; and the power supply power can be also used in a single control protector with redundancy configuration so that the protector is not limited to one DC power supply, and the power supply reliability is multiplied.

Description

technical field [0001] The invention belongs to the field of power station automation, and in particular relates to a DC isolation device for a power station. Background technique [0002] There are several sets of on-site control units for the monitoring system of the existing hydroelectric power plant, and each set uses a dual-cabinet redundant configuration with dual power supply sub-boxes and dual CPUs. The dual cabinets for monitoring the local control unit are used as independent redundant water machine automation protection control cabinets, and their AC and DC systems are provided by different sections of factory power. The DC operating system is the most important independent operating energy source of the power plant. Once a failure may cause the plant-wide DC operation to refuse or malfunction, the consequences are extremely serious. [0003] At present, the DC operating systems of the two sets of control cabinets can only be connected to the same busbar. If the...

AI Technical Summary

Problems solved by technology

However, the defect of the prior art is that there is a DC connection between the two DCs through a diode. When used in a power station that requires two completely independent DC 220V operating power sources, the insulation resistance between the two DCs will be extremely low. , a serious threat to the safe operation of the power station

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