DC Switchgear
PowerBond™
BRUSH PowerBond™ DC Switchgear is an innovative solution designed to meet the demands of the world’s busiest transit systems. Utilising our award-winning magnetic actuator technology, PowerBond™ is an all-in-one solution, combining the functionality of a line circuit breaker with that of a bonding switch.
Overview
Developed for today’s modern rail network, PowerBond™ is an air-insulated, air-break, high-speed direct current circuit breaker which allows direct current contact line systems to be fed from the traction power supply, or alternatively to be bonded to negative or earth.
Designed for 750V DC and 1500V traction power systems, both overhead line and conductor (3rd and 4th) rail, PowerBond™ is compatible with a wide range of protection relays, including BRUSH Switchgear Mitre+.
With all this functionality in one unit, PowerBond™ offers a smaller footprint, convenience of installation, safe maintenance and superior performance.
Key benefits
Resources
Technical specifications
| Ratings to EN 50123-1/2/6 and IEC 61992-1/2/6 | Symbol | 900 V Version | 1800 V Version |
|---|---|---|---|
| Nominal Voltage | Un | 750V | 1500V |
| Rated Voltage | UNe | 900V | 1800V |
| Rated insulation voltage | UNm | 1800V | 3000V |
| Rated impulse withstand voltage | UNi | 18kV | 18kV |
| Power Frequency Withstand | Ua | 6.9kA / 8.3kV | 6.9kA / 8.3kV |
| Overvoltage | OV | 4 | 3 |
| Pollution degree | PD | 4 | 4 |
| Rated Auxiliary Voltage | 48V, 50V, 110V or 125V dc | ||
| Circuit Breaker Rated Service Current | INe | 4000A (L), 6000A (R), 8000A (R; L), | 4000A (L), 6000A (R), |
| Busbar Selector Rated Service Current | INe | 4000A (*ve), 500A (-ve), | 4000A (*ve), 500A (-ve), |
| Positive Busbar Rated Service Current | INe | 6000A or 8000A | |
| Negative Busbar Rated Service Current | INe | 500A | |
| Rated Short Circuit Current | INss | 125kA / 180kAp | 100kA / 142kAp |
| Rated Short Time Withstand (Circuit Busbar) | INcw | 63kA / 90kAp for 250ms | |
| Rated Short Time Withstand (Positive Busbar) | INcw | 125kA / 180kAp for 250ms | |
| Rated Short Time Withstand (Negative Busbar) | INcw | 70kA / 100kAp for 250ms | |
| Rated Short Time Withstand (Earth Bar) | INcwe | 10kA / 14.2kAp for 1s | |
| Rated Track Time Constant | INc | 100ms | 63ms |
| Duty – Line (Feeder) Breakers | f, e, d, i -duty cycle 1 | ||
| Duty – Rectifier Breakers | r, s, lr | ||
| Duty – Interconnectors | ff, fr, lr | ||
| Critical Current | 50A Bi-Directional | ||
| Service Life | 40 Years | ||
| Mechanical endurance – Circuit Breaker | 20000 | ||
| Mechanical endurance – Busbar Selector | 10000 |
Switchgear services
From initial system analysis, to design, engineering, supply, installation, commissioning and upgrades of equipment through to repurposing or decommissioning. We provide lifecycle management and support.