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EMERSON 1000554 module card

IV. Measurements:
Neutral voltage (3U0)
Neutral current (3I0)
Real power component of neutral power (3U0  3I0)
Apparent power component of neutral power
Fault direction (1 = forwards, -1 = backwards). this measured variable only applies when the binary input “CB closed” is active) This function does not transfer any tripping measurements via the IBB. The measurements in the event list are not generated at the instant of tripping, but when the enabling levels “U-Setting” and “I-Dir are exceeded”.SendMode For what system condition a signal is transmitted in an intertripping scheme:
forwards measurement (only permissive scheme)
non-directional (only blocking scheme)
backwards measurement (only blocking scheme). 1 Channel Supplementary logic needed for coordinating E/F and distance protections when using the same communications channel for a permissive scheme.RecveInh. O/P for preventing the distance function from receiving a PLC signal. (This is only effective when E/F and distance protections use a common PLC channel, i.e. the parameter ‘1 Channel’ is set to ‘on’ .)

Coordination with the distance protection

 Directional E/F function as ancillary to the distance function Compared with integrated E/F and distance functions, the logic in an independent E/F function needs certain starting and tripping signals generated by the distance function and the E/F protection is blocked in the following situations:
starting of more than one distance phase
three-phase tripping
any trip (single and three-phase), if ‘1 Channel’ is set to ‘on’. Scheme with independent communication channels Apart from the added security of redundancy, independent communication channels enable different transfer tripping schemes to be used for E/F and distance protections. Providing the distance protection can detect a fault, it should trip before the E/F protection picks up. For this reason, the basic operating time ‘t basic’ for the E/F protection must be set longer than the longest response time to be expected of the distance protection. Scheme with a common communication channel Where E/F and distance protections use the same communication channel, the transfer tripping schemes must be either both permissive or both blocking. In the case of permissive schemes, in which the distance protection operates with non-directional criteria at one end for a weak infeed, a supplementary logic must be enabled by appropriately setting the parameter ‘Single chan.’.