Substation secondary system based on master units and subunits

Abstract

The invention discloses a substation secondary system based on master units and subunits. The system is characterized comprising a GPS clock, a monitoring background and a plurality of cross-interval master units. Each cross-interval master unit is connected with a plurality of single-interval subunits. Each single-interval subunit is externally connected with an electronic / conventional transformer, a switch and a knife switch. The cross-interval master units and the single-interval subunits are all connected with the monitoring background. The cross-interval master units, the single-interval subunits and the monitoring background are all connected with the GPS clock. According to the system provided by the invention, the problems that according to the intelligent substation, the number of devices is high, the configuration is complex and the construction and investment cost is high are solved; and the problems that according to the traditional substation, the electrical loop is complex and the cable consumption is high are solved. The system has the advantages that the fault removal time is short, the reliability is high, the electrical loop is simple and the maintenance is convenient.

Description

technical field [0001] The invention relates to a secondary system of a substation based on a main subunit, belonging to the field of electric power system automation. Background technique [0002] The secondary equipment of the traditional substation is connected to the primary equipment through cables to realize the collection of electrical quantities such as voltage, current, and switch status. The primary equipment is required to provide multiple interfaces to meet the access requirements of all secondary equipment. For example, there are two current transformers. Line protection and 1 busbar protection tap, its disadvantage is that the electrical circuit is complicated and the cable consumption is large, its advantage is that the protection device data collection, logic judgment and action export, all links are realized in one device, high reliability, short export time . The smart substation adopts the process layer merging unit and intelligent terminal to realize the...

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Problems solved by technology

[0005] Both of the above two patents adopt the method of integrated line separation protection measurement and control, merging unit and intelligent terminal, and do not mention bus coupling, section, transformer and bus separation scheme, do not mention monitoring system scheme, and do not constitute a complete secondary system

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