Breaker protection
Hitachi Energy's protection solutions are designed to ensure the safe and reliable operation of breakers for different substation arrangements and layouts.
The breaker protection solutions are designed to provide a standalone solution for applications where the integration of the breaker failure protection or automatic reclosing function into the mainline protection or centralized busbar protection or bay unit of distributed busbar protection is not preferred or suitable.
Applications
- Breaker bay with back-up protection functions, three-phase tripping
- Breaker bay connecting a sub-transmission/transmission line, with back-up protection functions, single-phase tripping, single busbar section
- Breaker bay connecting a sub-transmission/transmission line, with back-up protection functions, single-phase tripping, two busbar sections
Features
- Instantaneous phase overcurrent protection
- Four step directional phase and residual overcurrent protection
- Four step phase overcurrent protection
- Instantaneous residual overcurrent protection
- Sensitive directional residual overcurrent and power protection
- Thermal overload protection
- Breaker failure protection
- Stub protection
- Pole discordance protection
- Broken conductor check
- Directional under- and overpower protection
- Two step negative sequence based overcurrent protection
- Directional under- and over power protection
- Two step under- and overvoltage protection
- Two step residual overvoltage protection
- Loss of voltage check
- Under- and over-frequency protection
- Rate-of-change frequency protection
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