Tianjin Chen Fu 220kV intelligent substation is my company and Tianjin Electric Power Company to implement the national grid company intelligent substation key demonstration application project. The whole station by hub station to consider, select the open type electronic transformer. Current main transformer according to 2 design, voltage level using 220/110 / 35kV, 220kV main wiring for the double bus single segment, two 180MVA main transformer, 2 back into the line. 110kV side double mother single segment wiring, 7 return line. 35kV side of the single sub-paragraph wiring, 24 return line, two groups of capacitors.
The project uses the iPACS-5000D intelligent substation protection and control system. The main work includes the supply of the whole station control equipment, the organization of the network, the system integration and so on, and adopt the self-developed 220kV digital transformer protection, 220kV digital optical fiber longitudinal differential protection, 110KV line protection, digital monitoring and control devices, such as protection and control devices. October 30, 2009, by the Academician Zhou Xiaoxin as the director of the appraisal committee of the project on-site identification, the overall level of the project reached the international advanced level.
Chen Fu station network structure diagram shown in Figure 1. The whole station is divided into three layers, namely the process layer, the interval layer and the station control layer. The control layer implements the full range of digitization of 220kV digital line protection, 220kV digital transformer protection to 35kV digital low voltage protection and control device in the interval layer. At the process layer, Merge unit function and digital operation control terminal.
The whole station network is divided into sampling network, GOOSE network, station control layer network three parts, each part of the independent network, there is no physical connection, the network are used dual-network mechanism. Among them, GOOSE network to adapt to the protection of the configuration of the whole station dual star GOOSE network redundancy program, that is, 220kV each protection device single network design, the use of dual-configuration protection equipment to achieve network redundancy; 110kV and 35kV each protection equipment dual network Design, the use of the network itself to achieve redundancy. Both to ensure the independence of the two sets of protection and to ensure the redundancy of the network, the network structure is more simple and clear, easy to operate and maintain and improve the reliability.
Based on IEC61850 unified data model and communication platform, the system data model conforms to IEC61850 substation system specification to establish and completes the function of monitoring, control and recording of substation. The system can export SVG-compliant graphics files to the operation ticket and Work ticket system is used. The remote control function adopts the redundant design of the main equipment and double machine, and uses the IEC61850 standard to collect the substation information, and adopts the IEC60870-5-104, IEC60870-5-101 protocol and the CDT protocol to forward to the dispatching center.
Substation anti-misuse operation using three-level electrical interlocking anti-error, the first layer is the station control layer anti-error, by the background monitoring to achieve; the second layer is the interval layer error, by the monitoring device through GOOSE interactive information to achieve the whole station interlock; The third layer of the process layer error prevention, by a secondary auxiliary device to achieve electrical blocking. Process layer error prevention is independent of the interval layer error prevention, interval layer error prevention is independent of the monitoring background, to ensure that the three anti-error is relatively independent.