BR / DBR braking resistance

Electrodynamic braking is produced by reversing the power generated by the motors through the three-phase converter and the power is fed back to the line voltage. This power is then redirected by the chopper and is sent to the brake resistors, also known as BR or DBR, where it is dissipated into heat. When the overvoltage protection is activated, energy is also dissipated in these resistors.

Insulation class and thermal power (permanent and instantaneous) in these resistors are the most important parameters that should be taken into account when designing.

JDEVS is able to design and manufacture brake resistors in different power ranges and corresponded to the standard voltage levels in the train, i.e. 750VDC and 1500VDC. These resistors are capable to dissipate the reversed energy of two or four traction motors. It should be noted that their cooling system can be natural or forced air.