---Eight generating units are connected in parallel with 10 power lines
This case is a reconstruction project of a domestic factory
1、 Reasons for transformation
The eight generating units originally used parallel systems of other brands, but they often fail to be paralleled each time they need to generate electricity in parallel. In addition, after parallel connection, the load distribution is uneven, and some units will stop due to overload.
After each power failure, the generator set needs to be opened manually, and the operator on duty in the high-voltage distribution room opens the switch. The municipal power switch in the low-voltage distribution room is not released due to voltage loss. The operator on duty also needs to open the utility switch first and then switch on the generation switch. The process is cumbersome and not timely and safe.
2、 Site overview
Originally, the emergency power supply of this unit is divided into two phases, with a total of eight generating units. The first phase is 500kW * 4 generating units, and the second phase is 800KW * 4 generating units. The low-voltage distribution room is divided into five phases, each phase is supplied by two municipal power transformers, with a total of 10 loads. The layout of generator room and distribution room is shown in Figure 1.
Figure 1 layout of generator room and distribution room
3、 Transformation scheme
The reconstruction project is divided into two stages
The parallel control transformation of 8 generating units was carried out by hgm9510.
Through hgm9560, the 10 emergency power supply cabinet and 10 municipal power supply cabinet are transformed into grid connected control power supply.
Considering that the distance between the generator room and the low-voltage distribution room is relatively long, the remote transmission of MSC communication will cause data loss or abnormal communication. Therefore, sgcan300 can bus relay module is selected to convert msccan signal into optical fiber signal for long-distance transmission, and 8 sgcan300 are selected for this transformation project.
Figure 2 sgcan300 can bus relay conversion module
Figure 3 typical application diagram of msc1 and optical fiber conversion
Fig. 4 typical application diagram of multi machine parallel connection and multi-channel grid connection
Figure 5 installation and connection diagram of sgcan300 in cabinet
4、 Effect after transformation
Figure 6 distribution room 1
Figure 7 distribution room 2
Figure 8 distribution room 3 and 4
Figure 9 distribution room 5
Figure 10 generator room 1
Figure 11 generator room 2