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Data Acquisition -
Via Communication Interface
Sequence of event records
Up to 1000 events are stored and time tagged to 1ms
resolution.
Fault Records
The last 10 fault records are displayed on the relay fascia and
are also available through the communication interface,
with time and date of trip, measured quantities and type of
fault.
Waveform recorder
The waveform recorder stores analogue data for all poles
and the states of protection functions, binary inputs, LEDs
and binary outputs with user settable pre & post trigger
data. A record can be triggered from protection function,
binary input or via data communications. 10 records of 1
second duration are stored.
Demand Metering
A rolling record of demand over the last 24h is stored. The
demand is averaged over a user selectable period of time. A
rolling record of such demand averages is stored and
provides the demand history. A typical application is to
record 15min averages for the last 7 days.
Real Time Clock
The time and date can be set and are maintained while the
relay is de-energised by a back up storage capacitor. The
time can be synchronized from a binary input pulse or the
data communication channel.
Siemens Protection Devices Limited
Serial Communications
The relay offers a USB serial port as standard on the front of
all units. All of the relays functions can be set on a PC using
Reydisp Evolution via the USB port. The connection is made
with a USB cable and operates with a 'plug and play'
connection, so no pre-setting of the relay is required.
The front port can be switched off or set to use either the
DNP3.0, MODBUS-RTU, IEC60870-5-103 and ASCII protocols
for testing purposes.
A rear RS485 electrical connection is available on all units for
system interface connections. An internal terminating
resistor is provided, which can be connected into the circuit
by adding a wire loop between the relevant terminals.
Fig 8. Typical RS485 connection
The rear RS485 can be user selected to be OFF, IEC60870-5-
103, MODBUS RTU or DNP3.0 protocol.
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