Typical Project

Project Overview:
Lanzhou Aluminum Co., Ltd. “350KA Large Scale Prebaked Electrolytic Aluminum Technical Transformation Project” is the project listed in the 9th batch of National Bond Special Capital Project, and is the key electrolytic aluminum and aluminum processing implementation project of Aluminum Corporation of China in 2006. The total investment of the project exceeded RMB8 billion. The project is currently the electrolytic aluminum product line with highest current strength and most advanced equipment adopting prebaked electrolytic aluminum technique at home. 

Farad undertook the booster station power comprehensive automatic system of the technical transformation project and the captive power plant, and formed the complete automatic system. Since starting on March 15, 2007, the project only cost two and a half months till completion on May 30, 2007. All automatic systems of the project adopt advanced IEC61850 technology, which had greatly improved the safety and reliability of the system power supply, therefore, it was praised as the application sample of new generation comprehensive automatic technology in the aluminum industry and even the power industry. 

System Size: 

The power supply system of the project mainly composes of 220kV rectification substation, 35kV filter and 10kV distribution substation. Where, the 220kV rectification substation has 13 partitions with 6 rectification transformers and 2 power transformer partitions; the 35kVl filter composes of 6 set of filter switches; the whole factory is set with five 10kV distribution substations for general power distribution, purification, air compression, casting and electro analysis, including over 80 feeder circuits, which is the aluminum factory power supply system with biggest size currently.

System Characteristics:

220kV power supply and rectification system station is designed and implemented in accordance with the IEC61850 Communication Protocol Standard. The communication network is constructed according to the network technical requirements of IEC61850, and the communication network adopts double loop network structure. The main computer protection and monitoring equipment adopt the high performance equipment with dual redundancy automatic fault switch optical fiber Ethernet interface with special optical fiber switch (Supporting IEC61850 network structure) to form the fault redundancy switching double loop network junction. Two master and slave fault switching optical fiber ports (Interface A and Interface B) of the computer protection and monitoring device are connected with the Ethernet switch level respectively to form the double loop network (Network A and Network B) network system, additionally, two monitoring servers (Server A and Server B) for data acquisition and data storage management are also connected with the double loop network respectively. All equipment in the station form the network and communicate according to the IEC61850 Standard. When the Optical Fiber A communication port of computer protection and monitoring device is fault or the light source can’t be detected, it can automatically switch to Optical Fiber Communication Port B, and continue communicating with other devices or background monitoring system via Network B. Under this state, the faulty device completes the data acquisition and control functions with Network B and Server B via Optical Port B, Server A and Server B are capable of ensuring the integrity of the data storage record through transmitting data to each other. 

a) Simplifying the network structure 

The IEC61850 network structure of 220kV power supply and rectification comprehensive automatic system composes of the transformer substation level and bay level, which doesn’t need to collect and transmit data through protection or monitoring management computer. All devices are connected with the Ethernet as the independent main unit and can exchange information simultaneously with several main units of the Ethernet.

b)  Maximizing the communication function of the device 

The information in IEC61850 structure is transmitted through manufacturing message specification (MMS) protocol. MMS is capable of transmitting data of diversified specifications such as text information, and can communicate with several monitoring main units and device maintenance software through the Ethernet device, which can simplify the commissioning and maintenance of the device. 

c) Simplifying the device commissioning and maintenance 

The device of IEC61850 standard supports exchange function, the devices of different brands or same brand can be exchanged after simple configuration, which doesn’t need complicated communication configuration. If the equipment is damaged, it only requires installing the IEC61850 spare part of same function without the worry on the accordant brand and compatible protocol, and the link configuration and background monitoring configuration are not needed, which can greatly shorten the power failure time and simplify the maintenance. 

d) Maximizing the reliability of power supply 

The information transmission protocol is MMS. The communication media which is capable of transmitting information at high speed and the good communication system can assure the timely transmission of information in the transformer substation and the correct issuance of control command. 

e）The partitions and function equipment are interlocked through GOOSE. >

f）Supporting GPS IRI time synchronization and network time synchronization, it is capable of flexibly achieving the time synchronization function of device at any place in the station. 

g）The communication network is constructed basing on optical fiber Ethernet with redundancy and auto recovery function. Combining the MMS communication transmission system, the system response and control feedback are greatly improved compared with the past system, which has improved the power supply reliability of the whole system. 

h）Supporting file transmission and big data size query, it provides the condition for analyzing the fault recorder data and electricity quality data.