Block-modular load banks (BMNU)

Block-modular load banks BMNU are used for testing of generating sets and unit-size power stations up to 5.5 MW in various operating conditions. Block-modular load banks are fabricated on the basis of an automobile semitrailer.



Technical specifications


Rated voltage (kV)0,4; 6; 10; 35
Rated power (MW)0,63; 1; 1,2; 5,5
Ambient temperature during continuous operation at rated power (°C)from -55°C to +40°C
Duration of operation under voltage overload conditions up to 110% of Uratednot more than 1 hour
Possibility of shock total power switchingyes
Load stability under ambient temperature change from -30°C to +40°C15%
Possibility of resistor bank switching for load intensity changing by start-controlling devices in the range of 20-40-60-80-100%yes
Life time10 years
Climatic modificationUHL1 in accordance with GOST 15150

Notes:

UHL1 means:

UHL – operation in cold temperate climate;

1 – outdoor installation.


Block-modular load banks

Block-modular load banks BMNU are assembled from resistive banks which consist of electric heating boards PEG cooled forcedly by convection. 5.5 MW BMNU is assembled from six separate (detached) modules (3 masters and 3 slaves) placed on basements. Each two modules (master and slave) are electrically-connected. 10 kV voltage is supplied to a master module equipped with switching devices.


A module is designed as a rigid welded construction like a container. Axial fans are placed on the top of the module. Shutters are secured on the lateral sides of the module. Resistive element banks are located inside a module; each bank is designed as a stackable unit in which resistive elements are connected in series. Start-controlling devices and current transformers are placed in master modules. High-voltage busbars are located at the top of the central passage, whereas distribution boxes for fan switching are located on the post below. A control cabinet for master and slave module controlling is set on the lateral side of the master module.