UBR ELECTRONIC CURRENT PROTECTOR FOR VL-80 R ELECTRIC LOCOMOTIVE Russian patent published in 2012 - IPC B60L3/00 

FIELD: transport.

SUBSTANCE: invention relates to railway transport. Proposed device comprises anti-compounding unit with channel of affecting α_p (counter-emf VIL) and channel affecting α_B (excitation) and relay of ''Traction-Recuperation'' operating conditions. Every said channel represents a DC amplifier built around operating amplifier with its inputs connected to electric filters. At sharp variation of armature current, negative voltage originates at output amplifiers to increase phase of pulses at outputs of phase controllers from α_min to α_max, increasing counter-emf VIL, this decreasing armature current rise rate. Current controller operates in the range of low and medium speeds in channel VIL, while at high speeds VUV channel controller operates. VIL channel current controller is connected in circuit XI α0 and 0 and b to voltage divider R5, R7 while armature current controller in channel VUV is connected only to divider R6, R8 of anti-compounding unit. Said controller operate in turn. Limitation by anti-compounding unit setting is SET by selection of resistors R101, R102, while insensitivity threshold for VUV channel operation is SET by selection of resistors R110, R11.

EFFECT: automatic retention of preset braking force.

2 dwg