ETL600 1KHW001489-EN ABB Switzerland Ltd
• Signal boosting
By switching off speech and data communication for a short time,
the best use is made of the available transmitter power to
guarantee reliable transmission of every tripping signal sequence.
• Two tripping criteria
Incorrect operation due to a single fault is prevented by processing
guard and active signals separately.
• No additional bandwidth required
NSD600 requires no extra bandwidth because it uses the pilot of
the corresponding PLC channel as guard signal and the speech
band as command channel.
• Easy to configure and to service
A serial interface port is provided on the frontplate of the RF
converter P4LT for connecting a PC which enables operating and
equipment information to be viewed.
Configuration, supervision and adapting to the field requirements of
both the local and remote equipment is done by means of the user
interface HMI600 which operates under the MS-Windows
©
platform.
• Integrated event recorder and trip counters
More than 2000 command start/stop and more than 2000 alarm &
manipulation events can be recorded and stored with time stamp in
a non-volatile memory. The event recorder can be synchronized to
an external time signal (e.g. GPS receiver) for accurate time
stamping. The display of events is possible in text and graphical
views on the HMI600.
In addition to the event recorder integrated “trip counters” for each
sent and received command support investigations in case of faults
or abnormal conditions in the high voltage network.
• Universal teleprotection interface type G4AI
The teleprotection interface provides four opto-coupler inputs and
four solid-state outputs plus two heavy duty (electro-mechanical)
relay outputs with change-over contacts.
Each G4AI input can individually be set for:
• Not used (Off)
• Tx Command A, B, C or D
• Start criterion from protection relay
Each G4AI output can individually be set for:
• Not used (Off)
• Rx Command A, B, C or D
• Complete loss of incoming signals ('unblocking')
• Rx Guard signal (present)
• Tx Command A, B, C or D acknowledge
Structure and Function November 2005 3-57
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