Areva MiCOM P225, Техническое руководство

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P225/EN FT/B11 User Guide
Page 12/52 MiCOM P225
4.5.1.2 Selection of a default value to be display
The operator can select the measured value permanently displayed on the LCD screen from
the following list:
−
one of the 3 phase currents IA RMS, IB RMS, IC RMS,
−
the neutral current IN RMS,
−
the thermal state of the motor “THERM ST”,
−
the current value consumed by the motor as a percentage of the thermal current
threshold value I
θ
> (sub-menu [49] THERMAL OVERLOAD): I% LOAD
−
the waiting time before a start is permitted: T bef Start,
−
the time before a thermal trip occurs: T bef Trip,
−
the phase-phase voltage VAC RMS
−
the power factor: "POWER FACT",
−
the absorbed active power: "WATTs",
−
the absorbed reactive power: "VARs".
4.5.1.3 Motor start-up/Motor halted detection criteria
•
The MiCOM P225 relay offers the choice of start detection criteria as follows:
−
closure of the contactor/circuit breaker: criterion listed as 52A,
−
closure of the contactor/circuit breaker and overshoot of the starting current
threshold Istart ([48] EXCES. LONG START submenu). These two events must
appear within an interval of time of approximately 90 ms for the detection of a start
to be accepted. This criterion is known as 52A + I.
This facility makes it possible to adapt the configuration of the P225 relay to the type of
starting used: direct on_line or soft start.
•
The relay will consider the motor stopped upon drop-off of logic input L1 (logic
state 0).
N.B.: The P225 relay detects the information "contactor/circuit breaker
position" via logic input L1 (paragraph .4.11.4.1. "Fixed" inputs). The
connection of this logic input to the status of the breaking device
is obligatory.
4.5.1.4 Analogue outputs (optional)
The MiCOM P225 relay offers 2 optional analogue outputs to make the data available to a
logic controller, at 0-20 mA or 4-20 mA as desired. The current loop support can be used as
an active source circuit or a passive source circuit. The values which can be transmitted by
these analogue outputs are:
−
one of the 3 phase currents: IA RMS, IB RMS, IC RMS
−
the neutral current: IN RMS,
−
the voltage between phases A and C: VAC RMS
−
the power factor: POWER FACT
−
the active power: WATTs
−
the reactive power: VARs
−
the motor's thermal state: THERM ST,
−
the current absorbed by the motor, in percentage of the
I
θ>
thermal current
threshold: %I LOAD,