Event Record; Freezing - Siemens SICAM P38 Manual

Functions

3.6 Event Record

3.6 Event Record
1. Instantaneous extreme value of power grid will be recorded. The meter can record maximum value and
minimum value of each phase voltage, line voltage, phase current, neutral current, active power, reactive
power and apparent power within cycle time. Cycle time can be "month" or "day" and is set through
parameter mode character 2. At most extreme values of three cycles can be saved.
2. Zero clearing, demand clearing and event clearing can be recorded. The meter records 10 latest zero clear-
ing events.
3. Power failure event can be recorded. The meter records 10 latest power failure events, containing start time
and end time of power failure.
4. Timing event can be recorded. The meter records 10 latest timing events, containing pre-timing time and
post-timing time.
5. Voltage and current unbalance event can be recorded. The meter records 10 latest voltage unbalance events
and 10 latest current unbalance events. Decision limit and decision delay time of voltage and current unbal-
ance events are set by parameter.
Voltage unbalance ratio = (3-phase voltage maximum difference / 3-phase voltage mean) x 100%, where 3-
phase voltage maximum difference is the largest difference between effective values of each phase voltage
(only Uab and Ubc for 3-phase-3-wire) and 3-phase voltage mean is the mean of effective values of 3-phase
voltage.
Current unbalance ratio = (3-phase current maximum difference / 3-phase current mean) x 100%, where 3-
phase current maximum difference is the largest difference between effective values of each phase current
(only Iab and Ibc for 3-phase-3-wire) and 3-phase current mean is the mean of effective values of 3-phase
current.
6. Statistic data of voltage eligibility rate can be recorded. The meter records statistic voltage eligibility of each
phase within recent 12 months. Upper and lower limits for voltage assessment are set by parameter. Statistic
data of voltage eligibility include voltage monitoring time, voltage limit violation time, voltage eligibility and
voltage limit violation rate.
7. Relay closing event can be recorded. The meter has 2 relay outputs. When manual control is set for relay,
the meter will record 10 latest manual closing records of relay output. Closing time and status will be record-
ed.
8. SOE event can be recorded. The meter can record SOE events of 4 digital binary inputs and save 50 latest
records. Time of switch motion (exact to 1 msec), shift status and switch port number are recorded.
3.7

Freezing

1. Cyclic freezing: The meter can save data of 72 latest cyclic freezing actions. Start time and interval of freezing
are set with parameter. The content is import/export total active energy.
2. Daily freezing: The meter can save data of 8 latest daily freezing actions, including total active energy, total
reactive energy, four-quadrant reactive energy and total active maximum demand.
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SICAM P38 P39, 3-phase Power Meter with Multi-Tariff function, User Manual
E50417-H8940-C564-4, Release Date 06.2018