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2.2. MONITORING AND REGISTERING FUNCTIONS.
The SMOR system offers the following metering capabilities:
- Three-phase and ground current.
- Negative sequence current.
- Phase-to-phase voltages.
- Active and reactive power.
- Power factor.
- Frequency.
The RMS value for currents and voltages is calculated for each phase, and the phase-to-phase voltages are
calculated from the phase to ground voltages. The active and reactive power are also computed on these
values. The active and reactive power, and the power factor are only shown as three-phase values.
These measurements can be accessed locally on the liquid crystal display (LCD) on the front of the relay, or
via the GE-LOCAL communication software.
The SMOR unit has a demand register, as well as a maximeter register for current and active power. For the
demand register, the maximum and average RMS current are calculated over a selected period of 15, 30 or
60 minutes corresponding to the last 24, 48 or 96 hours respectively. The maximeter register computes the
maximum value for current and power for periods which are the same as those selected for the demand
register.
SMOR system monitors breaker status associated to the unit with a digital input (52/b). The breaker status
can be accessed using the local MMI or the communication software, which shows the breaker status in real
time through a visual simulation of the line.
An internal states matrix stores the digital information for all the units (inputs, pick-ups, alarms, etc). The
digital signals on this matrix are grouped in groups of 16 signals; there are 10 groups; It is a 10 x 16 matrix;
the final group corresponds to the 16 AND gates definable using the programmable logic of GE-INTRO
software.
The SMOR unit has a total of 17 LED indicators, one fixed bicolor assigned to the critical alarm function of
the unit and 16 red LED indicators, arranged in two columns of 8 LEDs. They can be configured using the
GE-INTRO configuration software to any of the user definable alarms (32 protection alarms and 16
communication alarms) assigned from among the protection and communication states. To define each
alarm, the user can use 16 inputs OR gates. All the inputs to an OR gate must belong to the same group in
the states matrix. Similarly, each LED can be configured to have memory in the absence of auxiliary power
supply (the status of the LED with memory is registered on the EEPROM memory). They can also be
configured to blink when turned on.
There is a test option for the LEDs, lighting them all up when the TARGET RESET button is pressed. When
this button is held down the LED indicators are reset.
The SMOR units are supplied from the manufacturer with the following default configuration of the LEDs:
GEK-105593C
2.2.2. ASSOCIATED BREAKER STATUS
9
2.2.1. MEASUREMENT
2.2.3. LED INDICATORS.
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