SAFEBOND 900VDC and 1800VDC, Integrated Track Feeder and Negative Shorting Panel

Description
Specifications
  • HV Dc switchgear for DC Traction power supply
  • The SafeBond incorporates the NDC high speed, unidirectional circuit breaker, featuring the award-winning magnetic actuator, to carry out the making and breaking of all load and fault currents, whilst an “off-load” motorised two position disconnector selects the circuit.
  • With the disconnector in the positive position and the NDC CB closed, the positive busbar is connected to the track feeder cable thereby functioning as a standard feeder circuit breaker.
  • With the disconnector in the negative position and the NDC CB closed the track feeder cable is bonded to the negative busbar, thereby functioning as a negative bonding device.
  • All operations are fully electrically interlocked and the control system can be operated remotely via SCADA or locally via the local control panel.
  • Standards : BSEN 50123 Series
  • Environmental Conditions As EN 50123-1 clause 4.1, normal
  • Expected service life; 30 years
  • Feeder circuit breaker and bonding functions integral to one panel
  • Fully rated, type tested and proven NDC circuit breaker does the making and breaking
  • Proven ‘off-load’ 2 position disconnector selects the circuit
  • Disconnector in positive position – Feeder circuit breaker function D
  • Disconnector in negative position – negative bonding function
  • Electrical control/interlocking schemes to suit customer requirements
  • SCADA Remote control of complete unit as standard
  • No additional civil engineering/cabling costs
  • No additional outdoor housing costs

 

SafeBond Switchgear
Rated Voltage V dc 900 1800
Rated Service Current A 4000/6000/8000 4000/6000
Nominal Voltage V dc 750 1500
Power-Frequency Withstand Level kV 9 9
Rated Short-Time Withstand Current kAp/kA 100/71 250ms 100/71 250ms
Rated Short-Circuit Current kAp/kA 180/125 142/100
Insulation Category   OV4 OV4
Rated Impulse Withstand kVp 20 20
Auxiliary Operating Supply V dc 48 / 110 / 220 48 / 110 / 220
Max and Min Operating Temperature Deg C 40 / -5 40 / -5
Degree of Pollution EN50124-1 PD4 EN50124-1 PD4
Disconnector
Rated Service Current – Positive A 4000 4000
Rated Service Current – Negative A 500 500
Mechanical Endurance Number of Operations 10,000 10,000
Nominal Motor Operating Time s 10 10
Circuit Breaker
Rated Track Time-Constant ms 100 63
Bi-directional Critical Current * A 25 25
Mechanical Endurance Number of Operations 50,000 50,000
Breaking Characteristic High Speed High Speed