Maintenance Manual AC DC EMU (Siemens) PDF

CAMTECH/E/13-14/MM AC-DC EMU/1.0 1 CHAPTER 6 OTHER ELECTRICAL EQUIPMENT 6.1 DC HIGH SPEED CIRCUIT BREAKER UR 6 The UR 6 circuit-breaker is a air co...

CAMTECH/E/13-14/MM AC-DC EMU/1.0 1 CHAPTER 6 OTHER ELECTRICAL EQUIPMENT 6.1 DC HIGH SPEED CIRCUIT BREAKER UR 6 The UR 6 circuit-breaker is a air cooled DC high-speed current-limiting circuit- breaker. It has been designed to ensure a trip free, rapid opening of its main contact, on detection of a short circuit, and to quickly extinguish the arc by generating a constant over-voltage during the whole interruption process. The circuit-breaker is made of independent mounted sub-assemblies, corresponding to the different functions. 1. Fixed insulating frame made of glass-fibre reinforced insulating material. 2. Main circuit, consisting of a lower connection terminal, a moving contact, an upper connection terminal, a fixed contact with horn (24) and another horn. 3. Over-current release. 4. Arc chute. 5. Closing device and fork. 6. Auxiliary contacts assembly. Because of its short response time following the detection of an excess current (short-circuit, over-load detection..), it is particularly suitable for the protection of the electrical equipment in rolling stock used on DC lines. Make M/s Secheron Type U6.32 Rated operational voltage 1800 V Rated insulation voltage 2000 V Maintenance Manual for AC-DC EMU (Siemens) Chapter 6 2 CAMTECH/E/13-14/MM AC-DC EMU/1.0 Rated operational current 1000 A Conventional free air thermal current (at Temp. = 40°C) 1000 A Rated short-circuit breaking and making capacity Iss/T Rated time constant T1 NA Rated time constant T2 30 kA/15 ms Rated time constant T3 30 kA/40 ms Rated time constant T4 30 kA/100 ms Direct over-current release 0.45 - 0.9 kA 0.6 - 1.2 kA 0.9 - 1.8 kA 1.2 - 2.4 kA 1.5 - 3.2 kA Maximum arc voltage 1.5 - 2.1 Ue 6.2 AC VACUUM CIRCUIT BREAKER (VCB) Technical Data Make: M/s Autometers alliance Ltd Type: VCBA25.10Tr Maximum rated voltage 30kV Nominal rated voltage AC (1-Ø) 25kV Power frequency withstand voltage (dry & wet) 75 kVrms Lightning impulse withstand voltage 175 kVrms Rated current 1000Arms System frequency 50 Hz Short circuit rupturing capacity 16kArms (440MVA) Making current 40 kArms Short time current capacity 16 kArms(3 sec.) Opening time < 60 ms Closing time < 100 ms Control voltage 110 VDC Input air supply pressure 4.5 to 10 kg/cm² Rated operating sequence -- CO-3 min-CO Chapter 6 Maintenance Manual for AC DC EMU (Siemens) CAMTECH/E/13-14/MM AC-DC EMU/1.0 3 6.3 AC-DC CHANGE OVER SWITCH The single-knife switch is designed to connect power supply from pantograph to other circuits provided in a traction vehicle. This switch ensures switching between two different power supply units. The switch is mounted on traction vehicle roof. The switch incorporates a moving contact knife fixed on an insulator and connected to a shaft which extends into a traction vehicle area and contact springs mounted on the base plate via insulator. Under the plate, fitted on the shaft is a lever designed to transfer the motion from a pneumatic cylinder, thus ensuring the moving contact knife turning. There is a split on the shaft which controls via pin and adapter four auxiliary contact switches. The base plate contains a bracket connected via pin to the pneumatic cylinder; a switchboard and a pneumatic electromagnetic valve 5/2 are used for the pneumatic cylinder control. Female panel connector mounted on the holder is connected to power leads for the electromagnetic valves and cam switches connected. On the upper side, the plate is provided with an M8 thread for a bolt used for the connection to a traction vehicle earthing system. Up to position of moving contact are supplied by power from pantograph: - contact C with the pneumatic cylinder piston rod shifted out - contact B with the pneumatic cylinder piston rod slid in. The switch is designed to switching power supply from the pantograph by disengaging of moving contact (knife) from one contact spring, turning in approximately 60° and engaging into second contact springs. Technical Data Make: M/s Secheron Type: RS 25.10 Main circuit Nominal voltage UN 25 /kV/ AC Rated insulation voltage UNm 36 /kV/ AC Rated operating voltage Ue 27.5 /kV/ AC Frequency f 162/3; 50 or 60 /Hz/ Maintenance Manual for AC-DC EMU (Siemens) Chapter 6 4 CAMTECH/E/13-14/MM AC-DC EMU/1.0 Short-time withstand current: 1s Ik 25 /kArms/ Dynamic withstand current Ip 63 /kA/ Minimum conducting current (gold) 4mA/24V DC Breaking knife angle of turning ° 60° Mounting position horizontal Weight 57 kg Control circuit Nominal voltage 110 /V/ DC Tolerance of auxiliary voltage -30% / +25% Pneumatic drive Operating pressure range 0.4 - 1 /MPa/ Dielectric test voltage: control circuit-earth (AC 50 Hz during 60 s) 1.5 /kV/ Change-over time (at pressure 1MPa)