The protection relay contains two binary power outputs. These power outputs connect externally to circuit breakers and are normally used for energizing the breaker closing coil and trip coil. The binary power outputs (also called TRIP relays) are implemented by software controlled mechanical relays. At power-up (cold boot), all relays are OFF through power-on reset of the micro-controller. In case of a warm boot, the relays remain in the state they are. They can be forced into OFF state by activating the RESET of the micro-controller. The micro-controller is located on the DIO module and controls the relays on the PSU module through logic control lines. To improve robustness, control and switching functions in the relay driver are double mainly to prevent a single error from tripping the power binary output relay.
Description | Value | |
|---|---|---|
Rated voltage | 250 V AC/DC | |
Continuous contact carry | 8 A | |
Make and carry for 3.0 s | 15 A | |
Make and carry for 0.5 s | 30 A | |
Breaking capacity when the control-circuit time constant L/R <40 ms, at 48/110/220 V DC (two contacts connected in series for double pole power outputs) | 5 A/3 A/1 A | |
Contact operating time | <10 ms | |
Trip-circuit supervision (TCS) | Control voltage range | 20...250 V AC/DC |
Current drain through the supervision circuit | ~1.5 mA | |
Minimum voltage over the TCS contact | 20 V AC/DC (15...20 V) | |
Channel to channel isolation | BOs shall be isolated from each other so that they can be connected freely to external potentials. In addition to all the type tests, fully isolated outputs must pass dielectric isolation test requirements as mentioned in the type test guidelines. | |