Patent CZ-297033-B6 (CZ)
Title: Method of safe assessment of rail circuit unrestraint and rail circuit arrangement for making the same
Inventor: FARAN ANTONIN
IPC: B61L23/00
Filed: 2003-07-16
Abstract: When employing the invented method of safe assessment of rail circuit unrestraint, the signal current (SP) being present at the rail circuit (KO) feeding end (NK) is safely assessed by a safe signal detector (BDS), whereby the signal current (SP) is generated at the remote end (VK) of the rail circuit (KO) so that an electronic switch (ES) being controlled by a signal generator (GS) in intentions of this signal in short time tempos, makes and subsequently cancels short circuit between a first remote terminal (KPV-1) of a first stretch of rails (1KP) of a track section (KU) and a second remote terminal (KPV-2) of a second stretch of rails (2KP) of the track section (KU). In a first embodiment of the rail circuit arrangement for carrying out this method of safe assessment of the rail circuit unrestraint, a first terminal (UN-1) of a power-supply unit (UN) is connected to a first terminal (BDS-1) of the safe signal detector (BDS), while a second terminal (UN-2) of the power-supply unit (UN) is connected to a second terminal (BDS-2) of the safe signal detector (BDS), whereby a third terminal (BDS-3) of the safe signal detector (BDS) is connected to a first terminal (TR-1) of an isolation transformer (TR) while a fourth terminal (BDS-4) of the safe signal detector (BDS) is connected to a second terminal (TR-2) of the isolation transformer (TR) wherein said isolation transformer (TR) third terminal (TR-3) is connected to a first feed terminal (KPN-1) of the first stretch of rails (1KP) of the track section (KU), which said isolation transformer (TR) fourth terminal (TR-4) is connected to a second feed terminal (KPN-2) of the second stretch of rails (2KP) of the track section (KU). Said first remote terminal (KPV-1) of the first stretch of rails (1KP) of the track section (KU) is connected to both a first terminal (ES-1) of the electronic switch (ES) and the first terminal (GS-2) of the signal generator (GS) while said second remote terminal (KPV-2) of the second stretch of rails (2KP) of the track section (KU) is connected to both a second terminal (ES-2) of the electronic switch (ES) and a second terminal (GS-1) of the signal generator (GS). In a second embodiment of the rail circuit arrangement for carrying out this method of safe assessment of the rail circuit unrestraint, the first terminal (KPN-1) of the first stretch of rails (1KP) of the track section (KU) while the second terminal (UN-2) of the power-supply unit (UN) is connected to the first terminal (TR-1) of the isolation transformer (TR) while said isolation transformer (TR) second terminal (TR-2) is connected to the second feed terminal (KPN-2) of the second stretch of rails (2KP) of the track section (KU), wherein said isolation transformer (TR) third terminal (TR-3) is connected to the second terminal (BDS-2) of the safe signal detector (BDS) and said isolation transformer (TR) fourth terminal (TR-4) is connected to the first terminal (BDS-1) of the safe signal (BDS). The first remote terminal (KPV-1) of the first stretch of rails (1KP) of the track section (KU) is connected to both the first terminal (ES-1) of the electronic switch (ES) and the first terminal (GS-2) of the signal generator (GS) while the second remote terminal (KPV-2) of the second stretch of rails (2KP) of the track section (KU) is connected to both the second terminal (ES-2) of the electronic switch (ES) and the second terminal (GS-1) of the signal generator (GS).